/* @license C3.js v0.5.3 | (c) C3 Team and other contributors | http://c3js.org/ */
(function (global, factory) {
    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
    typeof define === 'function' && define.amd ? define(factory) :
    (global.c3 = factory());
}(this, (function () { 'use strict';

    var CLASS = {
        target: 'c3-target',
        chart: 'c3-chart',
        chartLine: 'c3-chart-line',
        chartLines: 'c3-chart-lines',
        chartBar: 'c3-chart-bar',
        chartBars: 'c3-chart-bars',
        chartText: 'c3-chart-text',
        chartTexts: 'c3-chart-texts',
        chartArc: 'c3-chart-arc',
        chartArcs: 'c3-chart-arcs',
        chartArcsTitle: 'c3-chart-arcs-title',
        chartArcsBackground: 'c3-chart-arcs-background',
        chartArcsGaugeUnit: 'c3-chart-arcs-gauge-unit',
        chartArcsGaugeMax: 'c3-chart-arcs-gauge-max',
        chartArcsGaugeMin: 'c3-chart-arcs-gauge-min',
        selectedCircle: 'c3-selected-circle',
        selectedCircles: 'c3-selected-circles',
        eventRect: 'c3-event-rect',
        eventRects: 'c3-event-rects',
        eventRectsSingle: 'c3-event-rects-single',
        eventRectsMultiple: 'c3-event-rects-multiple',
        zoomRect: 'c3-zoom-rect',
        brush: 'c3-brush',
        focused: 'c3-focused',
        defocused: 'c3-defocused',
        region: 'c3-region',
        regions: 'c3-regions',
        title: 'c3-title',
        tooltipContainer: 'c3-tooltip-container',
        tooltip: 'c3-tooltip',
        tooltipName: 'c3-tooltip-name',
        shape: 'c3-shape',
        shapes: 'c3-shapes',
        line: 'c3-line',
        lines: 'c3-lines',
        bar: 'c3-bar',
        bars: 'c3-bars',
        circle: 'c3-circle',
        circles: 'c3-circles',
        arc: 'c3-arc',
        arcLabelLine: 'c3-arc-label-line',
        arcs: 'c3-arcs',
        area: 'c3-area',
        areas: 'c3-areas',
        empty: 'c3-empty',
        text: 'c3-text',
        texts: 'c3-texts',
        gaugeValue: 'c3-gauge-value',
        grid: 'c3-grid',
        gridLines: 'c3-grid-lines',
        xgrid: 'c3-xgrid',
        xgrids: 'c3-xgrids',
        xgridLine: 'c3-xgrid-line',
        xgridLines: 'c3-xgrid-lines',
        xgridFocus: 'c3-xgrid-focus',
        ygrid: 'c3-ygrid',
        ygrids: 'c3-ygrids',
        ygridLine: 'c3-ygrid-line',
        ygridLines: 'c3-ygrid-lines',
        axis: 'c3-axis',
        axisX: 'c3-axis-x',
        axisXLabel: 'c3-axis-x-label',
        axisY: 'c3-axis-y',
        axisYLabel: 'c3-axis-y-label',
        axisY2: 'c3-axis-y2',
        axisY2Label: 'c3-axis-y2-label',
        legendBackground: 'c3-legend-background',
        legendItem: 'c3-legend-item',
        legendItemEvent: 'c3-legend-item-event',
        legendItemTile: 'c3-legend-item-tile',
        legendItemHidden: 'c3-legend-item-hidden',
        legendItemFocused: 'c3-legend-item-focused',
        dragarea: 'c3-dragarea',
        EXPANDED: '_expanded_',
        SELECTED: '_selected_',
        INCLUDED: '_included_'
    };

    var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) {
      return typeof obj;
    } : function (obj) {
      return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
    };

    var classCallCheck = function (instance, Constructor) {
      if (!(instance instanceof Constructor)) {
        throw new TypeError("Cannot call a class as a function");
      }
    };

    var defineProperty = function (obj, key, value) {
      if (key in obj) {
        Object.defineProperty(obj, key, {
          value: value,
          enumerable: true,
          configurable: true,
          writable: true
        });
      } else {
        obj[key] = value;
      }

      return obj;
    };

    var inherits = function (subClass, superClass) {
      if (typeof superClass !== "function" && superClass !== null) {
        throw new TypeError("Super expression must either be null or a function, not " + typeof superClass);
      }

      subClass.prototype = Object.create(superClass && superClass.prototype, {
        constructor: {
          value: subClass,
          enumerable: false,
          writable: true,
          configurable: true
        }
      });
      if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass;
    };

    var possibleConstructorReturn = function (self, call) {
      if (!self) {
        throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
      }

      return call && (typeof call === "object" || typeof call === "function") ? call : self;
    };

    var toArray = function (arr) {
      return Array.isArray(arr) ? arr : Array.from(arr);
    };

    var isValue = function isValue(v) {
        return v || v === 0;
    };
    var isFunction = function isFunction(o) {
        return typeof o === 'function';
    };
    var isArray = function isArray(o) {
        return Array.isArray(o);
    };
    var isString = function isString(o) {
        return typeof o === 'string';
    };
    var isUndefined = function isUndefined(v) {
        return typeof v === 'undefined';
    };
    var isDefined = function isDefined(v) {
        return typeof v !== 'undefined';
    };
    var ceil10 = function ceil10(v) {
        return Math.ceil(v / 10) * 10;
    };
    var asHalfPixel = function asHalfPixel(n) {
        return Math.ceil(n) + 0.5;
    };
    var diffDomain = function diffDomain(d) {
        return d[1] - d[0];
    };
    var isEmpty = function isEmpty(o) {
        return typeof o === 'undefined' || o === null || isString(o) && o.length === 0 || (typeof o === 'undefined' ? 'undefined' : _typeof(o)) === 'object' && Object.keys(o).length === 0;
    };
    var notEmpty = function notEmpty(o) {
        return !c3_chart_internal_fn.isEmpty(o);
    };
    var getOption = function getOption(options, key, defaultValue) {
        return isDefined(options[key]) ? options[key] : defaultValue;
    };
    var hasValue = function hasValue(dict, value) {
        var found = false;
        Object.keys(dict).forEach(function (key) {
            if (dict[key] === value) {
                found = true;
            }
        });
        return found;
    };
    var sanitise = function sanitise(str) {
        return typeof str === 'string' ? str.replace(/</g, '&lt;').replace(/>/g, '&gt;') : str;
    };
    var getPathBox = function getPathBox(path) {
        var box = path.getBoundingClientRect(),
            items = [path.pathSegList.getItem(0), path.pathSegList.getItem(1)],
            minX = items[0].x,
            minY = Math.min(items[0].y, items[1].y);
        return { x: minX, y: minY, width: box.width, height: box.height };
    };

    var c3_axis_fn;
    var c3_axis_internal_fn;

    function AxisInternal(component, params) {
        var internal = this;
        internal.component = component;
        internal.params = params || {};

        internal.d3 = component.d3;
        internal.scale = internal.d3.scaleLinear();
        internal.range;
        internal.orient = "bottom";
        internal.innerTickSize = 6;
        internal.outerTickSize = this.params.withOuterTick ? 6 : 0;
        internal.tickPadding = 3;
        internal.tickValues = null;
        internal.tickFormat;
        internal.tickArguments;

        internal.tickOffset = 0;
        internal.tickCulling = true;
        internal.tickCentered;
        internal.tickTextCharSize;
        internal.tickTextRotate = internal.params.tickTextRotate;
        internal.tickLength;

        internal.axis = internal.generateAxis();
    }
    c3_axis_internal_fn = AxisInternal.prototype;

    c3_axis_internal_fn.axisX = function (selection, x, tickOffset) {
        selection.attr("transform", function (d) {
            return "translate(" + Math.ceil(x(d) + tickOffset) + ", 0)";
        });
    };
    c3_axis_internal_fn.axisY = function (selection, y) {
        selection.attr("transform", function (d) {
            return "translate(0," + Math.ceil(y(d)) + ")";
        });
    };
    c3_axis_internal_fn.scaleExtent = function (domain) {
        var start = domain[0],
            stop = domain[domain.length - 1];
        return start < stop ? [start, stop] : [stop, start];
    };
    c3_axis_internal_fn.generateTicks = function (scale) {
        var internal = this;
        var i,
            domain,
            ticks = [];
        if (scale.ticks) {
            return scale.ticks.apply(scale, internal.tickArguments);
        }
        domain = scale.domain();
        for (i = Math.ceil(domain[0]); i < domain[1]; i++) {
            ticks.push(i);
        }
        if (ticks.length > 0 && ticks[0] > 0) {
            ticks.unshift(ticks[0] - (ticks[1] - ticks[0]));
        }
        return ticks;
    };
    c3_axis_internal_fn.copyScale = function () {
        var internal = this;
        var newScale = internal.scale.copy(),
            domain;
        if (internal.params.isCategory) {
            domain = internal.scale.domain();
            newScale.domain([domain[0], domain[1] - 1]);
        }
        return newScale;
    };
    c3_axis_internal_fn.textFormatted = function (v) {
        var internal = this,
            formatted = internal.tickFormat ? internal.tickFormat(v) : v;
        return typeof formatted !== 'undefined' ? formatted : '';
    };
    c3_axis_internal_fn.updateRange = function () {
        var internal = this;
        internal.range = internal.scale.rangeExtent ? internal.scale.rangeExtent() : internal.scaleExtent(internal.scale.range());
        return internal.range;
    };
    c3_axis_internal_fn.updateTickTextCharSize = function (tick) {
        var internal = this;
        if (internal.tickTextCharSize) {
            return internal.tickTextCharSize;
        }
        var size = {
            h: 11.5,
            w: 5.5
        };
        tick.select('text').text(function (d) {
            return internal.textFormatted(d);
        }).each(function (d) {
            var box = this.getBoundingClientRect(),
                text = internal.textFormatted(d),
                h = box.height,
                w = text ? box.width / text.length : undefined;
            if (h && w) {
                size.h = h;
                size.w = w;
            }
        }).text('');
        internal.tickTextCharSize = size;
        return size;
    };
    c3_axis_internal_fn.isVertical = function () {
        return this.orient === 'left' || this.orient === 'right';
    };
    c3_axis_internal_fn.tspanData = function (d, i, scale) {
        var internal = this;
        var splitted = internal.params.tickMultiline ? internal.splitTickText(d, scale) : [].concat(internal.textFormatted(d));
        return splitted.map(function (s) {
            return { index: i, splitted: s, length: splitted.length };
        });
    };
    c3_axis_internal_fn.splitTickText = function (d, scale) {
        var internal = this,
            tickText = internal.textFormatted(d),
            maxWidth = internal.params.tickWidth,
            subtext,
            spaceIndex,
            textWidth,
            splitted = [];

        if (Object.prototype.toString.call(tickText) === "[object Array]") {
            return tickText;
        }

        if (!maxWidth || maxWidth <= 0) {
            maxWidth = internal.isVertical() ? 95 : internal.params.isCategory ? Math.ceil(scale(1) - scale(0)) - 12 : 110;
        }

        function split(splitted, text) {
            spaceIndex = undefined;
            for (var i = 1; i < text.length; i++) {
                if (text.charAt(i) === ' ') {
                    spaceIndex = i;
                }
                subtext = text.substr(0, i + 1);
                textWidth = internal.tickTextCharSize.w * subtext.length;
                // if text width gets over tick width, split by space index or crrent index
                if (maxWidth < textWidth) {
                    return split(splitted.concat(text.substr(0, spaceIndex ? spaceIndex : i)), text.slice(spaceIndex ? spaceIndex + 1 : i));
                }
            }
            return splitted.concat(text);
        }

        return split(splitted, tickText + "");
    };
    c3_axis_internal_fn.updateTickLength = function () {
        var internal = this;
        internal.tickLength = Math.max(internal.innerTickSize, 0) + internal.tickPadding;
    };
    c3_axis_internal_fn.lineY2 = function (d) {
        var internal = this,
            tickPosition = internal.scale(d) + (internal.tickCentered ? 0 : internal.tickOffset);
        return internal.range[0] < tickPosition && tickPosition < internal.range[1] ? internal.innerTickSize : 0;
    };
    c3_axis_internal_fn.textY = function () {
        var internal = this,
            rotate = internal.tickTextRotate;
        return rotate ? 11.5 - 2.5 * (rotate / 15) * (rotate > 0 ? 1 : -1) : internal.tickLength;
    };
    c3_axis_internal_fn.textTransform = function () {
        var internal = this,
            rotate = internal.tickTextRotate;
        return rotate ? "rotate(" + rotate + ")" : "";
    };
    c3_axis_internal_fn.textTextAnchor = function () {
        var internal = this,
            rotate = internal.tickTextRotate;
        return rotate ? rotate > 0 ? "start" : "end" : "middle";
    };
    c3_axis_internal_fn.tspanDx = function () {
        var internal = this,
            rotate = internal.tickTextRotate;
        return rotate ? 8 * Math.sin(Math.PI * (rotate / 180)) : 0;
    };
    c3_axis_internal_fn.tspanDy = function (d, i) {
        var internal = this,
            dy = internal.tickTextCharSize.h;
        if (i === 0) {
            if (internal.isVertical()) {
                dy = -((d.length - 1) * (internal.tickTextCharSize.h / 2) - 3);
            } else {
                dy = ".71em";
            }
        }
        return dy;
    };

    c3_axis_internal_fn.generateAxis = function () {
        var internal = this,
            d3 = internal.d3,
            params = internal.params;
        function axis(g, transition) {
            var self;
            g.each(function () {
                var g = axis.g = d3.select(this);

                var scale0 = this.__chart__ || internal.scale,
                    scale1 = this.__chart__ = internal.copyScale();

                var ticksValues = internal.tickValues ? internal.tickValues : internal.generateTicks(scale1),
                    ticks = g.selectAll(".tick").data(ticksValues, scale1),
                    tickEnter = ticks.enter().insert("g", ".domain").attr("class", "tick").style("opacity", 1e-6),

                // MEMO: No exit transition. The reason is this transition affects max tick width calculation because old tick will be included in the ticks.
                tickExit = ticks.exit().remove(),
                    tickUpdate = ticks.merge(tickEnter),
                    tickTransform,
                    tickX,
                    tickY;

                if (params.isCategory) {
                    internal.tickOffset = Math.ceil((scale1(1) - scale1(0)) / 2);
                    tickX = internal.tickCentered ? 0 : internal.tickOffset;
                    tickY = internal.tickCentered ? internal.tickOffset : 0;
                } else {
                    internal.tickOffset = tickX = 0;
                }

                internal.updateRange();
                internal.updateTickLength();
                internal.updateTickTextCharSize(g.select('.tick'));

                var lineUpdate = tickUpdate.select("line").merge(tickEnter.append("line")),
                    textUpdate = tickUpdate.select("text").merge(tickEnter.append("text"));

                var tspans = tickUpdate.selectAll('text').selectAll('tspan').data(function (d, i) {
                    return internal.tspanData(d, i, scale1);
                }),
                    tspanEnter = tspans.enter().append('tspan'),
                    tspanUpdate = tspanEnter.merge(tspans).text(function (d) {
                    return d.splitted;
                });
                tspans.exit().remove();

                var path = g.selectAll(".domain").data([0]),
                    pathUpdate = path.enter().append("path").merge(path).attr("class", "domain");

                // TODO: each attr should be one function and change its behavior by internal.orient, probably
                switch (internal.orient) {
                    case "bottom":
                        {
                            tickTransform = internal.axisX;
                            lineUpdate.attr("x1", tickX).attr("x2", tickX).attr("y2", function (d, i) {
                                return internal.lineY2(d, i);
                            });
                            textUpdate.attr("x", 0).attr("y", function (d, i) {
                                return internal.textY(d, i);
                            }).attr("transform", function (d, i) {
                                return internal.textTransform(d, i);
                            }).style("text-anchor", function (d, i) {
                                return internal.textTextAnchor(d, i);
                            });
                            tspanUpdate.attr('x', 0).attr("dy", function (d, i) {
                                return internal.tspanDy(d, i);
                            }).attr('dx', function (d, i) {
                                return internal.tspanDx(d, i);
                            });
                            pathUpdate.attr("d", "M" + internal.range[0] + "," + internal.outerTickSize + "V0H" + internal.range[1] + "V" + internal.outerTickSize);
                            break;
                        }
                    case "top":
                        {
                            // TODO: rotated tick text
                            tickTransform = internal.axisX;
                            lineUpdate.attr("x1", tickX).attr("x2", tickX).attr("y2", function (d, i) {
                                return -1 * internal.lineY2(d, i);
                            });
                            textUpdate.attr("x", 0).attr("y", function (d, i) {
                                return -1 * internal.textY(d, i) - (params.isCategory ? 2 : internal.tickLength - 2);
                            }).attr("transform", function (d, i) {
                                return internal.textTransform(d, i);
                            }).style("text-anchor", function (d, i) {
                                return internal.textTextAnchor(d, i);
                            });
                            tspanUpdate.attr('x', 0).attr("dy", function (d, i) {
                                return internal.tspanDy(d, i);
                            }).attr('dx', function (d, i) {
                                return internal.tspanDx(d, i);
                            });
                            pathUpdate.attr("d", "M" + internal.range[0] + "," + -internal.outerTickSize + "V0H" + internal.range[1] + "V" + -internal.outerTickSize);
                            break;
                        }
                    case "left":
                        {
                            tickTransform = internal.axisY;
                            lineUpdate.attr("x2", -internal.innerTickSize).attr("y1", tickY).attr("y2", tickY);
                            textUpdate.attr("x", -internal.tickLength).attr("y", internal.tickOffset).style("text-anchor", "end");
                            tspanUpdate.attr('x', -internal.tickLength).attr("dy", function (d, i) {
                                return internal.tspanDy(d, i);
                            });
                            pathUpdate.attr("d", "M" + -internal.outerTickSize + "," + internal.range[0] + "H0V" + internal.range[1] + "H" + -internal.outerTickSize);
                            break;
                        }
                    case "right":
                        {
                            tickTransform = internal.axisY;
                            lineUpdate.attr("x2", internal.innerTickSize).attr("y1", tickY).attr("y2", tickY);
                            textUpdate.attr("x", internal.tickLength).attr("y", internal.tickOffset).style("text-anchor", "start");
                            tspanUpdate.attr('x', internal.tickLength).attr("dy", function (d, i) {
                                return internal.tspanDy(d, i);
                            });
                            pathUpdate.attr("d", "M" + internal.outerTickSize + "," + internal.range[0] + "H0V" + internal.range[1] + "H" + internal.outerTickSize);
                            break;
                        }
                }
                if (scale1.rangeBand) {
                    var x = scale1,
                        dx = x.rangeBand() / 2;
                    scale0 = scale1 = function scale1(d) {
                        return x(d) + dx;
                    };
                } else if (scale0.rangeBand) {
                    scale0 = scale1;
                } else {
                    tickExit.call(tickTransform, scale1, internal.tickOffset);
                }
                tickEnter.call(tickTransform, scale0, internal.tickOffset);
                self = (transition ? tickUpdate.transition(transition) : tickUpdate).style('opacity', 1).call(tickTransform, scale1, internal.tickOffset);
            });
            return self;
        }
        axis.scale = function (x) {
            if (!arguments.length) {
                return internal.scale;
            }
            internal.scale = x;
            return axis;
        };
        axis.orient = function (x) {
            if (!arguments.length) {
                return internal.orient;
            }
            internal.orient = x in { top: 1, right: 1, bottom: 1, left: 1 } ? x + "" : "bottom";
            return axis;
        };
        axis.tickFormat = function (format) {
            if (!arguments.length) {
                return internal.tickFormat;
            }
            internal.tickFormat = format;
            return axis;
        };
        axis.tickCentered = function (isCentered) {
            if (!arguments.length) {
                return internal.tickCentered;
            }
            internal.tickCentered = isCentered;
            return axis;
        };
        axis.tickOffset = function () {
            return internal.tickOffset;
        };
        axis.tickInterval = function () {
            var interval, length;
            if (params.isCategory) {
                interval = internal.tickOffset * 2;
            } else {
                length = axis.g.select('path.domain').node().getTotalLength() - internal.outerTickSize * 2;
                interval = length / axis.g.selectAll('line').size();
            }
            return interval === Infinity ? 0 : interval;
        };
        axis.ticks = function () {
            if (!arguments.length) {
                return internal.tickArguments;
            }
            internal.tickArguments = arguments;
            return axis;
        };
        axis.tickCulling = function (culling) {
            if (!arguments.length) {
                return internal.tickCulling;
            }
            internal.tickCulling = culling;
            return axis;
        };
        axis.tickValues = function (x) {
            if (typeof x === 'function') {
                internal.tickValues = function () {
                    return x(internal.scale.domain());
                };
            } else {
                if (!arguments.length) {
                    return internal.tickValues;
                }
                internal.tickValues = x;
            }
            return axis;
        };
        return axis;
    };

    var Axis = function (_Component) {
        inherits(Axis, _Component);

        function Axis(owner) {
            classCallCheck(this, Axis);

            var fn = {
                fn: c3_axis_fn,
                internal: {
                    fn: c3_axis_internal_fn
                }
            };

            var _this = possibleConstructorReturn(this, (Axis.__proto__ || Object.getPrototypeOf(Axis)).call(this, owner, 'axis', fn));

            _this.d3 = owner.d3;
            _this.internal = AxisInternal;
            return _this;
        }

        return Axis;
    }(Component);

    c3_axis_fn = Axis.prototype;

    c3_axis_fn.init = function init() {
        var $$ = this.owner,
            config = $$.config,
            main = $$.main;
        $$.axes.x = main.append("g").attr("class", CLASS.axis + ' ' + CLASS.axisX).attr("clip-path", config.axis_x_inner ? "" : $$.clipPathForXAxis).attr("transform", $$.getTranslate('x')).style("visibility", config.axis_x_show ? 'visible' : 'hidden');
        $$.axes.x.append("text").attr("class", CLASS.axisXLabel).attr("transform", config.axis_rotated ? "rotate(-90)" : "").style("text-anchor", this.textAnchorForXAxisLabel.bind(this));
        $$.axes.y = main.append("g").attr("class", CLASS.axis + ' ' + CLASS.axisY).attr("clip-path", config.axis_y_inner ? "" : $$.clipPathForYAxis).attr("transform", $$.getTranslate('y')).style("visibility", config.axis_y_show ? 'visible' : 'hidden');
        $$.axes.y.append("text").attr("class", CLASS.axisYLabel).attr("transform", config.axis_rotated ? "" : "rotate(-90)").style("text-anchor", this.textAnchorForYAxisLabel.bind(this));

        $$.axes.y2 = main.append("g").attr("class", CLASS.axis + ' ' + CLASS.axisY2)
        // clip-path?
        .attr("transform", $$.getTranslate('y2')).style("visibility", config.axis_y2_show ? 'visible' : 'hidden');
        $$.axes.y2.append("text").attr("class", CLASS.axisY2Label).attr("transform", config.axis_rotated ? "" : "rotate(-90)").style("text-anchor", this.textAnchorForY2AxisLabel.bind(this));
    };
    c3_axis_fn.getXAxis = function getXAxis(scale, orient, tickFormat, tickValues, withOuterTick, withoutTransition, withoutRotateTickText) {
        var $$ = this.owner,
            config = $$.config,
            axisParams = {
            isCategory: $$.isCategorized(),
            withOuterTick: withOuterTick,
            tickMultiline: config.axis_x_tick_multiline,
            tickWidth: config.axis_x_tick_width,
            tickTextRotate: withoutRotateTickText ? 0 : config.axis_x_tick_rotate,
            withoutTransition: withoutTransition
        },
            axis = new this.internal(this, axisParams).axis.scale(scale).orient(orient);

        if ($$.isTimeSeries() && tickValues && typeof tickValues !== "function") {
            tickValues = tickValues.map(function (v) {
                return $$.parseDate(v);
            });
        }

        // Set tick
        axis.tickFormat(tickFormat).tickValues(tickValues);
        if ($$.isCategorized()) {
            axis.tickCentered(config.axis_x_tick_centered);
            if (isEmpty(config.axis_x_tick_culling)) {
                config.axis_x_tick_culling = false;
            }
        }

        return axis;
    };
    c3_axis_fn.updateXAxisTickValues = function updateXAxisTickValues(targets, axis) {
        var $$ = this.owner,
            config = $$.config,
            tickValues;
        if (config.axis_x_tick_fit || config.axis_x_tick_count) {
            tickValues = this.generateTickValues($$.mapTargetsToUniqueXs(targets), config.axis_x_tick_count, $$.isTimeSeries());
        }
        if (axis) {
            axis.tickValues(tickValues);
        } else {
            $$.xAxis.tickValues(tickValues);
            $$.subXAxis.tickValues(tickValues);
        }
        return tickValues;
    };
    c3_axis_fn.getYAxis = function getYAxis(scale, orient, tickFormat, tickValues, withOuterTick, withoutTransition, withoutRotateTickText) {
        var $$ = this.owner,
            config = $$.config,
            axisParams = {
            withOuterTick: withOuterTick,
            withoutTransition: withoutTransition,
            tickTextRotate: withoutRotateTickText ? 0 : config.axis_y_tick_rotate
        },
            axis = new this.internal(this, axisParams).axis.scale(scale).orient(orient).tickFormat(tickFormat);
        if ($$.isTimeSeriesY()) {
            axis.ticks(config.axis_y_tick_time_type, config.axis_y_tick_time_interval);
        } else {
            axis.tickValues(tickValues);
        }
        return axis;
    };
    c3_axis_fn.getId = function getId(id) {
        var config = this.owner.config;
        return id in config.data_axes ? config.data_axes[id] : 'y';
    };
    c3_axis_fn.getXAxisTickFormat = function getXAxisTickFormat() {
        var $$ = this.owner,
            config = $$.config,
            format = $$.isTimeSeries() ? $$.defaultAxisTimeFormat : $$.isCategorized() ? $$.categoryName : function (v) {
            return v < 0 ? v.toFixed(0) : v;
        };
        if (config.axis_x_tick_format) {
            if (isFunction(config.axis_x_tick_format)) {
                format = config.axis_x_tick_format;
            } else if ($$.isTimeSeries()) {
                format = function format(date) {
                    return date ? $$.axisTimeFormat(config.axis_x_tick_format)(date) : "";
                };
            }
        }
        return isFunction(format) ? function (v) {
            return format.call($$, v);
        } : format;
    };
    c3_axis_fn.getTickValues = function getTickValues(tickValues, axis) {
        return tickValues ? tickValues : axis ? axis.tickValues() : undefined;
    };
    c3_axis_fn.getXAxisTickValues = function getXAxisTickValues() {
        return this.getTickValues(this.owner.config.axis_x_tick_values, this.owner.xAxis);
    };
    c3_axis_fn.getYAxisTickValues = function getYAxisTickValues() {
        return this.getTickValues(this.owner.config.axis_y_tick_values, this.owner.yAxis);
    };
    c3_axis_fn.getY2AxisTickValues = function getY2AxisTickValues() {
        return this.getTickValues(this.owner.config.axis_y2_tick_values, this.owner.y2Axis);
    };
    c3_axis_fn.getLabelOptionByAxisId = function getLabelOptionByAxisId(axisId) {
        var $$ = this.owner,
            config = $$.config,
            option;
        if (axisId === 'y') {
            option = config.axis_y_label;
        } else if (axisId === 'y2') {
            option = config.axis_y2_label;
        } else if (axisId === 'x') {
            option = config.axis_x_label;
        }
        return option;
    };
    c3_axis_fn.getLabelText = function getLabelText(axisId) {
        var option = this.getLabelOptionByAxisId(axisId);
        return isString(option) ? option : option ? option.text : null;
    };
    c3_axis_fn.setLabelText = function setLabelText(axisId, text) {
        var $$ = this.owner,
            config = $$.config,
            option = this.getLabelOptionByAxisId(axisId);
        if (isString(option)) {
            if (axisId === 'y') {
                config.axis_y_label = text;
            } else if (axisId === 'y2') {
                config.axis_y2_label = text;
            } else if (axisId === 'x') {
                config.axis_x_label = text;
            }
        } else if (option) {
            option.text = text;
        }
    };
    c3_axis_fn.getLabelPosition = function getLabelPosition(axisId, defaultPosition) {
        var option = this.getLabelOptionByAxisId(axisId),
            position = option && (typeof option === 'undefined' ? 'undefined' : _typeof(option)) === 'object' && option.position ? option.position : defaultPosition;
        return {
            isInner: position.indexOf('inner') >= 0,
            isOuter: position.indexOf('outer') >= 0,
            isLeft: position.indexOf('left') >= 0,
            isCenter: position.indexOf('center') >= 0,
            isRight: position.indexOf('right') >= 0,
            isTop: position.indexOf('top') >= 0,
            isMiddle: position.indexOf('middle') >= 0,
            isBottom: position.indexOf('bottom') >= 0
        };
    };
    c3_axis_fn.getXAxisLabelPosition = function getXAxisLabelPosition() {
        return this.getLabelPosition('x', this.owner.config.axis_rotated ? 'inner-top' : 'inner-right');
    };
    c3_axis_fn.getYAxisLabelPosition = function getYAxisLabelPosition() {
        return this.getLabelPosition('y', this.owner.config.axis_rotated ? 'inner-right' : 'inner-top');
    };
    c3_axis_fn.getY2AxisLabelPosition = function getY2AxisLabelPosition() {
        return this.getLabelPosition('y2', this.owner.config.axis_rotated ? 'inner-right' : 'inner-top');
    };
    c3_axis_fn.getLabelPositionById = function getLabelPositionById(id) {
        return id === 'y2' ? this.getY2AxisLabelPosition() : id === 'y' ? this.getYAxisLabelPosition() : this.getXAxisLabelPosition();
    };
    c3_axis_fn.textForXAxisLabel = function textForXAxisLabel() {
        return this.getLabelText('x');
    };
    c3_axis_fn.textForYAxisLabel = function textForYAxisLabel() {
        return this.getLabelText('y');
    };
    c3_axis_fn.textForY2AxisLabel = function textForY2AxisLabel() {
        return this.getLabelText('y2');
    };
    c3_axis_fn.xForAxisLabel = function xForAxisLabel(forHorizontal, position) {
        var $$ = this.owner;
        if (forHorizontal) {
            return position.isLeft ? 0 : position.isCenter ? $$.width / 2 : $$.width;
        } else {
            return position.isBottom ? -$$.height : position.isMiddle ? -$$.height / 2 : 0;
        }
    };
    c3_axis_fn.dxForAxisLabel = function dxForAxisLabel(forHorizontal, position) {
        if (forHorizontal) {
            return position.isLeft ? "0.5em" : position.isRight ? "-0.5em" : "0";
        } else {
            return position.isTop ? "-0.5em" : position.isBottom ? "0.5em" : "0";
        }
    };
    c3_axis_fn.textAnchorForAxisLabel = function textAnchorForAxisLabel(forHorizontal, position) {
        if (forHorizontal) {
            return position.isLeft ? 'start' : position.isCenter ? 'middle' : 'end';
        } else {
            return position.isBottom ? 'start' : position.isMiddle ? 'middle' : 'end';
        }
    };
    c3_axis_fn.xForXAxisLabel = function xForXAxisLabel() {
        return this.xForAxisLabel(!this.owner.config.axis_rotated, this.getXAxisLabelPosition());
    };
    c3_axis_fn.xForYAxisLabel = function xForYAxisLabel() {
        return this.xForAxisLabel(this.owner.config.axis_rotated, this.getYAxisLabelPosition());
    };
    c3_axis_fn.xForY2AxisLabel = function xForY2AxisLabel() {
        return this.xForAxisLabel(this.owner.config.axis_rotated, this.getY2AxisLabelPosition());
    };
    c3_axis_fn.dxForXAxisLabel = function dxForXAxisLabel() {
        return this.dxForAxisLabel(!this.owner.config.axis_rotated, this.getXAxisLabelPosition());
    };
    c3_axis_fn.dxForYAxisLabel = function dxForYAxisLabel() {
        return this.dxForAxisLabel(this.owner.config.axis_rotated, this.getYAxisLabelPosition());
    };
    c3_axis_fn.dxForY2AxisLabel = function dxForY2AxisLabel() {
        return this.dxForAxisLabel(this.owner.config.axis_rotated, this.getY2AxisLabelPosition());
    };
    c3_axis_fn.dyForXAxisLabel = function dyForXAxisLabel() {
        var $$ = this.owner,
            config = $$.config,
            position = this.getXAxisLabelPosition();
        if (config.axis_rotated) {
            return position.isInner ? "1.2em" : -25 - ($$.config.axis_x_inner ? 0 : this.getMaxTickWidth('x'));
        } else {
            return position.isInner ? "-0.5em" : config.axis_x_height ? config.axis_x_height - 10 : "3em";
        }
    };
    c3_axis_fn.dyForYAxisLabel = function dyForYAxisLabel() {
        var $$ = this.owner,
            position = this.getYAxisLabelPosition();
        if ($$.config.axis_rotated) {
            return position.isInner ? "-0.5em" : "3em";
        } else {
            return position.isInner ? "1.2em" : -10 - ($$.config.axis_y_inner ? 0 : this.getMaxTickWidth('y') + 10);
        }
    };
    c3_axis_fn.dyForY2AxisLabel = function dyForY2AxisLabel() {
        var $$ = this.owner,
            position = this.getY2AxisLabelPosition();
        if ($$.config.axis_rotated) {
            return position.isInner ? "1.2em" : "-2.2em";
        } else {
            return position.isInner ? "-0.5em" : 15 + ($$.config.axis_y2_inner ? 0 : this.getMaxTickWidth('y2') + 15);
        }
    };
    c3_axis_fn.textAnchorForXAxisLabel = function textAnchorForXAxisLabel() {
        var $$ = this.owner;
        return this.textAnchorForAxisLabel(!$$.config.axis_rotated, this.getXAxisLabelPosition());
    };
    c3_axis_fn.textAnchorForYAxisLabel = function textAnchorForYAxisLabel() {
        var $$ = this.owner;
        return this.textAnchorForAxisLabel($$.config.axis_rotated, this.getYAxisLabelPosition());
    };
    c3_axis_fn.textAnchorForY2AxisLabel = function textAnchorForY2AxisLabel() {
        var $$ = this.owner;
        return this.textAnchorForAxisLabel($$.config.axis_rotated, this.getY2AxisLabelPosition());
    };
    c3_axis_fn.getMaxTickWidth = function getMaxTickWidth(id, withoutRecompute) {
        var $$ = this.owner,
            config = $$.config,
            maxWidth = 0,
            targetsToShow,
            scale,
            axis,
            dummy,
            svg;
        if (withoutRecompute && $$.currentMaxTickWidths[id]) {
            return $$.currentMaxTickWidths[id];
        }
        if ($$.svg) {
            targetsToShow = $$.filterTargetsToShow($$.data.targets);
            if (id === 'y') {
                scale = $$.y.copy().domain($$.getYDomain(targetsToShow, 'y'));
                axis = this.getYAxis(scale, $$.yOrient, config.axis_y_tick_format, $$.yAxisTickValues, false, true, true);
            } else if (id === 'y2') {
                scale = $$.y2.copy().domain($$.getYDomain(targetsToShow, 'y2'));
                axis = this.getYAxis(scale, $$.y2Orient, config.axis_y2_tick_format, $$.y2AxisTickValues, false, true, true);
            } else {
                scale = $$.x.copy().domain($$.getXDomain(targetsToShow));
                axis = this.getXAxis(scale, $$.xOrient, $$.xAxisTickFormat, $$.xAxisTickValues, false, true, true);
                this.updateXAxisTickValues(targetsToShow, axis);
            }
            dummy = $$.d3.select('body').append('div').classed('c3', true);
            svg = dummy.append("svg").style('visibility', 'hidden').style('position', 'fixed').style('top', 0).style('left', 0), svg.append('g').call(axis).each(function () {
                $$.d3.select(this).selectAll('text').each(function () {
                    var box = this.getBoundingClientRect();
                    if (maxWidth < box.width) {
                        maxWidth = box.width;
                    }
                });
                dummy.remove();
            });
        }
        $$.currentMaxTickWidths[id] = maxWidth <= 0 ? $$.currentMaxTickWidths[id] : maxWidth;
        return $$.currentMaxTickWidths[id];
    };

    c3_axis_fn.updateLabels = function updateLabels(withTransition) {
        var $$ = this.owner;
        var axisXLabel = $$.main.select('.' + CLASS.axisX + ' .' + CLASS.axisXLabel),
            axisYLabel = $$.main.select('.' + CLASS.axisY + ' .' + CLASS.axisYLabel),
            axisY2Label = $$.main.select('.' + CLASS.axisY2 + ' .' + CLASS.axisY2Label);
        (withTransition ? axisXLabel.transition() : axisXLabel).attr("x", this.xForXAxisLabel.bind(this)).attr("dx", this.dxForXAxisLabel.bind(this)).attr("dy", this.dyForXAxisLabel.bind(this)).text(this.textForXAxisLabel.bind(this));
        (withTransition ? axisYLabel.transition() : axisYLabel).attr("x", this.xForYAxisLabel.bind(this)).attr("dx", this.dxForYAxisLabel.bind(this)).attr("dy", this.dyForYAxisLabel.bind(this)).text(this.textForYAxisLabel.bind(this));
        (withTransition ? axisY2Label.transition() : axisY2Label).attr("x", this.xForY2AxisLabel.bind(this)).attr("dx", this.dxForY2AxisLabel.bind(this)).attr("dy", this.dyForY2AxisLabel.bind(this)).text(this.textForY2AxisLabel.bind(this));
    };
    c3_axis_fn.getPadding = function getPadding(padding, key, defaultValue, domainLength) {
        var p = typeof padding === 'number' ? padding : padding[key];
        if (!isValue(p)) {
            return defaultValue;
        }
        if (padding.unit === 'ratio') {
            return padding[key] * domainLength;
        }
        // assume padding is pixels if unit is not specified
        return this.convertPixelsToAxisPadding(p, domainLength);
    };
    c3_axis_fn.convertPixelsToAxisPadding = function convertPixelsToAxisPadding(pixels, domainLength) {
        var $$ = this.owner,
            length = $$.config.axis_rotated ? $$.width : $$.height;
        return domainLength * (pixels / length);
    };
    c3_axis_fn.generateTickValues = function generateTickValues(values, tickCount, forTimeSeries) {
        var tickValues = values,
            targetCount,
            start,
            end,
            count,
            interval,
            i,
            tickValue;
        if (tickCount) {
            targetCount = isFunction(tickCount) ? tickCount() : tickCount;
            // compute ticks according to tickCount
            if (targetCount === 1) {
                tickValues = [values[0]];
            } else if (targetCount === 2) {
                tickValues = [values[0], values[values.length - 1]];
            } else if (targetCount > 2) {
                count = targetCount - 2;
                start = values[0];
                end = values[values.length - 1];
                interval = (end - start) / (count + 1);
                // re-construct unique values
                tickValues = [start];
                for (i = 0; i < count; i++) {
                    tickValue = +start + interval * (i + 1);
                    tickValues.push(forTimeSeries ? new Date(tickValue) : tickValue);
                }
                tickValues.push(end);
            }
        }
        if (!forTimeSeries) {
            tickValues = tickValues.sort(function (a, b) {
                return a - b;
            });
        }
        return tickValues;
    };
    c3_axis_fn.generateTransitions = function generateTransitions(duration) {
        var $$ = this.owner,
            axes = $$.axes;
        return {
            axisX: duration ? axes.x.transition().duration(duration) : axes.x,
            axisY: duration ? axes.y.transition().duration(duration) : axes.y,
            axisY2: duration ? axes.y2.transition().duration(duration) : axes.y2,
            axisSubX: duration ? axes.subx.transition().duration(duration) : axes.subx
        };
    };
    c3_axis_fn.redraw = function redraw(duration, isHidden) {
        var $$ = this.owner,
            transition = duration ? $$.d3.transition().duration(duration) : null;
        $$.axes.x.style("opacity", isHidden ? 0 : 1).call($$.xAxis, transition);
        $$.axes.y.style("opacity", isHidden ? 0 : 1).call($$.yAxis, transition);
        $$.axes.y2.style("opacity", isHidden ? 0 : 1).call($$.y2Axis, transition);
        $$.axes.subx.style("opacity", isHidden ? 0 : 1).call($$.subXAxis, transition);
    };

    var c3 = { version: "0.5.3" };

    var c3_chart_fn;
    var c3_chart_internal_fn;

    function Component(owner, componentKey, fn) {
        this.owner = owner;
        c3.chart.internal[componentKey] = fn;
    }

    function Chart(config) {
        var $$ = this.internal = new ChartInternal(this);
        $$.loadConfig(config);

        $$.beforeInit(config);
        $$.init();
        $$.afterInit(config);

        // bind "this" to nested API
        (function bindThis(fn, target, argThis) {
            Object.keys(fn).forEach(function (key) {
                target[key] = fn[key].bind(argThis);
                if (Object.keys(fn[key]).length > 0) {
                    bindThis(fn[key], target[key], argThis);
                }
            });
        })(c3_chart_fn, this, this);
    }

    function ChartInternal(api) {
        var $$ = this;
        $$.d3 = window.d3 ? window.d3 : typeof require !== 'undefined' ? require("d3") : undefined;
        $$.api = api;
        $$.config = $$.getDefaultConfig();
        $$.data = {};
        $$.cache = {};
        $$.axes = {};
    }

    c3.generate = function (config) {
        return new Chart(config);
    };

    c3.chart = {
        fn: Chart.prototype,
        internal: {
            fn: ChartInternal.prototype
        }
    };
    c3_chart_fn = c3.chart.fn;
    c3_chart_internal_fn = c3.chart.internal.fn;

    c3_chart_internal_fn.beforeInit = function () {
        // can do something
    };
    c3_chart_internal_fn.afterInit = function () {
        // can do something
    };
    c3_chart_internal_fn.init = function () {
        var $$ = this,
            config = $$.config;

        $$.initParams();

        if (config.data_url) {
            $$.convertUrlToData(config.data_url, config.data_mimeType, config.data_headers, config.data_keys, $$.initWithData);
        } else if (config.data_json) {
            $$.initWithData($$.convertJsonToData(config.data_json, config.data_keys));
        } else if (config.data_rows) {
            $$.initWithData($$.convertRowsToData(config.data_rows));
        } else if (config.data_columns) {
            $$.initWithData($$.convertColumnsToData(config.data_columns));
        } else {
            throw Error('url or json or rows or columns is required.');
        }
    };

    c3_chart_internal_fn.initParams = function () {
        var $$ = this,
            d3 = $$.d3,
            config = $$.config;

        // MEMO: clipId needs to be unique because it conflicts when multiple charts exist
        $$.clipId = "c3-" + +new Date() + '-clip', $$.clipIdForXAxis = $$.clipId + '-xaxis', $$.clipIdForYAxis = $$.clipId + '-yaxis', $$.clipIdForGrid = $$.clipId + '-grid', $$.clipIdForSubchart = $$.clipId + '-subchart', $$.clipPath = $$.getClipPath($$.clipId), $$.clipPathForXAxis = $$.getClipPath($$.clipIdForXAxis), $$.clipPathForYAxis = $$.getClipPath($$.clipIdForYAxis);
        $$.clipPathForGrid = $$.getClipPath($$.clipIdForGrid), $$.clipPathForSubchart = $$.getClipPath($$.clipIdForSubchart), $$.dragStart = null;
        $$.dragging = false;
        $$.flowing = false;
        $$.cancelClick = false;
        $$.mouseover = false;
        $$.transiting = false;

        $$.color = $$.generateColor();
        $$.levelColor = $$.generateLevelColor();

        $$.dataTimeParse = (config.data_xLocaltime ? d3.timeParse : d3.utcParse)($$.config.data_xFormat);
        $$.axisTimeFormat = config.axis_x_localtime ? d3.timeFormat : d3.utcFormat;
        $$.defaultAxisTimeFormat = function (date) {
            if (date.getMilliseconds()) {
                return d3.timeFormat(".%L")(date);
            }
            if (date.getSeconds()) {
                return d3.timeFormat(":%S")(date);
            }
            if (date.getMinutes()) {
                return d3.timeFormat("%I:%M")(date);
            }
            if (date.getHours()) {
                return d3.timeFormat("%I %p")(date);
            }
            if (date.getDay() && date.getDate() !== 1) {
                return d3.timeFormat("%-m/%-d")(date);
            }
            if (date.getDate() !== 1) {
                return d3.timeFormat("%-m/%-d")(date);
            }
            if (date.getMonth()) {
                return d3.timeFormat("%-m/%-d")(date);
            }
            return d3.timeFormat("%Y/%-m/%-d")(date);
        };
        $$.hiddenTargetIds = [];
        $$.hiddenLegendIds = [];
        $$.focusedTargetIds = [];
        $$.defocusedTargetIds = [];

        $$.xOrient = config.axis_rotated ? config.axis_x_inner ? "right" : "left" : config.axis_x_inner ? "top" : "bottom";
        $$.yOrient = config.axis_rotated ? config.axis_y_inner ? "top" : "bottom" : config.axis_y_inner ? "right" : "left";
        $$.y2Orient = config.axis_rotated ? config.axis_y2_inner ? "bottom" : "top" : config.axis_y2_inner ? "left" : "right";
        $$.subXOrient = config.axis_rotated ? "left" : "bottom";

        $$.isLegendRight = config.legend_position === 'right';
        $$.isLegendInset = config.legend_position === 'inset';
        $$.isLegendTop = config.legend_inset_anchor === 'top-left' || config.legend_inset_anchor === 'top-right';
        $$.isLegendLeft = config.legend_inset_anchor === 'top-left' || config.legend_inset_anchor === 'bottom-left';
        $$.legendStep = 0;
        $$.legendItemWidth = 0;
        $$.legendItemHeight = 0;

        $$.currentMaxTickWidths = {
            x: 0,
            y: 0,
            y2: 0
        };

        $$.rotated_padding_left = 30;
        $$.rotated_padding_right = config.axis_rotated && !config.axis_x_show ? 0 : 30;
        $$.rotated_padding_top = 5;

        $$.withoutFadeIn = {};

        $$.intervalForObserveInserted = undefined;

        $$.axes.subx = d3.selectAll([]); // needs when excluding subchart.js
    };

    c3_chart_internal_fn.initChartElements = function () {
        if (this.initBar) {
            this.initBar();
        }
        if (this.initLine) {
            this.initLine();
        }
        if (this.initArc) {
            this.initArc();
        }
        if (this.initGauge) {
            this.initGauge();
        }
        if (this.initText) {
            this.initText();
        }
    };

    c3_chart_internal_fn.initWithData = function (data) {
        var $$ = this,
            d3 = $$.d3,
            config = $$.config;
        var defs,
            main,
            binding = true;

        $$.axis = new Axis($$);

        if (!config.bindto) {
            $$.selectChart = d3.selectAll([]);
        } else if (typeof config.bindto.node === 'function') {
            $$.selectChart = config.bindto;
        } else {
            $$.selectChart = d3.select(config.bindto);
        }
        if ($$.selectChart.empty()) {
            $$.selectChart = d3.select(document.createElement('div')).style('opacity', 0);
            $$.observeInserted($$.selectChart);
            binding = false;
        }
        $$.selectChart.html("").classed("c3", true);

        // Init data as targets
        $$.data.xs = {};
        $$.data.targets = $$.convertDataToTargets(data);

        if (config.data_filter) {
            $$.data.targets = $$.data.targets.filter(config.data_filter);
        }

        // Set targets to hide if needed
        if (config.data_hide) {
            $$.addHiddenTargetIds(config.data_hide === true ? $$.mapToIds($$.data.targets) : config.data_hide);
        }
        if (config.legend_hide) {
            $$.addHiddenLegendIds(config.legend_hide === true ? $$.mapToIds($$.data.targets) : config.legend_hide);
        }

        // Init sizes and scales
        $$.updateSizes();
        $$.updateScales();

        // Set domains for each scale
        $$.x.domain(d3.extent($$.getXDomain($$.data.targets)));
        $$.y.domain($$.getYDomain($$.data.targets, 'y'));
        $$.y2.domain($$.getYDomain($$.data.targets, 'y2'));
        $$.subX.domain($$.x.domain());
        $$.subY.domain($$.y.domain());
        $$.subY2.domain($$.y2.domain());

        // Save original x domain for zoom update
        $$.orgXDomain = $$.x.domain();

        /*-- Basic Elements --*/

        // Define svgs
        $$.svg = $$.selectChart.append("svg").style("overflow", "hidden").on('mouseenter', function () {
            return config.onmouseover.call($$);
        }).on('mouseleave', function () {
            return config.onmouseout.call($$);
        });

        if ($$.config.svg_classname) {
            $$.svg.attr('class', $$.config.svg_classname);
        }

        // Define defs
        defs = $$.svg.append("defs");
        $$.clipChart = $$.appendClip(defs, $$.clipId);
        $$.clipXAxis = $$.appendClip(defs, $$.clipIdForXAxis);
        $$.clipYAxis = $$.appendClip(defs, $$.clipIdForYAxis);
        $$.clipGrid = $$.appendClip(defs, $$.clipIdForGrid);
        $$.clipSubchart = $$.appendClip(defs, $$.clipIdForSubchart);
        $$.updateSvgSize();

        // Define regions
        main = $$.main = $$.svg.append("g").attr("transform", $$.getTranslate('main'));

        if ($$.initPie) {
            $$.initPie();
        }
        if ($$.initSubchart) {
            $$.initSubchart();
        }
        if ($$.initTooltip) {
            $$.initTooltip();
        }
        if ($$.initLegend) {
            $$.initLegend();
        }
        if ($$.initTitle) {
            $$.initTitle();
        }
        if ($$.initZoom) {
            $$.initZoom();
        }

        // Update selection based on size and scale
        // TODO: currently this must be called after initLegend because of update of sizes, but it should be done in initSubchart.
        if ($$.initSubchartBrush) {
            $$.initSubchartBrush();
        }

        /*-- Main Region --*/

        // text when empty
        main.append("text").attr("class", CLASS.text + ' ' + CLASS.empty).attr("text-anchor", "middle") // horizontal centering of text at x position in all browsers.
        .attr("dominant-baseline", "middle"); // vertical centering of text at y position in all browsers, except IE.

        // Regions
        $$.initRegion();

        // Grids
        $$.initGrid();

        // Define g for chart area
        main.append('g').attr("clip-path", $$.clipPath).attr('class', CLASS.chart);

        // Grid lines
        if (config.grid_lines_front) {
            $$.initGridLines();
        }

        // Define g for chart
        $$.initChartElements();

        // Add Axis
        $$.axis.init();

        // Set targets
        $$.updateTargets($$.data.targets);

        // Cover whole with rects for events
        $$.initEventRect();

        // Set default extent if defined
        if (config.axis_x_selection) {
            $$.brush.selectionAsValue($$.getDefaultSelection());
        }

        // Draw with targets
        if (binding) {
            $$.updateDimension();
            $$.config.oninit.call($$);
            $$.redraw({
                withTransition: false,
                withTransform: true,
                withUpdateXDomain: true,
                withUpdateOrgXDomain: true,
                withTransitionForAxis: false
            });
        }

        // Bind resize event
        $$.bindResize();

        // export element of the chart
        $$.api.element = $$.selectChart.node();
    };

    c3_chart_internal_fn.smoothLines = function (el, type) {
        var $$ = this;
        if (type === 'grid') {
            el.each(function () {
                var g = $$.d3.select(this),
                    x1 = g.attr('x1'),
                    x2 = g.attr('x2'),
                    y1 = g.attr('y1'),
                    y2 = g.attr('y2');
                g.attr({
                    'x1': Math.ceil(x1),
                    'x2': Math.ceil(x2),
                    'y1': Math.ceil(y1),
                    'y2': Math.ceil(y2)
                });
            });
        }
    };

    c3_chart_internal_fn.updateSizes = function () {
        var $$ = this,
            config = $$.config;
        var legendHeight = $$.legend ? $$.getLegendHeight() : 0,
            legendWidth = $$.legend ? $$.getLegendWidth() : 0,
            legendHeightForBottom = $$.isLegendRight || $$.isLegendInset ? 0 : legendHeight,
            hasArc = $$.hasArcType(),
            xAxisHeight = config.axis_rotated || hasArc ? 0 : $$.getHorizontalAxisHeight('x'),
            subchartHeight = config.subchart_show && !hasArc ? config.subchart_size_height + xAxisHeight : 0;

        $$.currentWidth = $$.getCurrentWidth();
        $$.currentHeight = $$.getCurrentHeight();

        // for main
        $$.margin = config.axis_rotated ? {
            top: $$.getHorizontalAxisHeight('y2') + $$.getCurrentPaddingTop(),
            right: hasArc ? 0 : $$.getCurrentPaddingRight(),
            bottom: $$.getHorizontalAxisHeight('y') + legendHeightForBottom + $$.getCurrentPaddingBottom(),
            left: subchartHeight + (hasArc ? 0 : $$.getCurrentPaddingLeft())
        } : {
            top: 4 + $$.getCurrentPaddingTop(), // for top tick text
            right: hasArc ? 0 : $$.getCurrentPaddingRight(),
            bottom: xAxisHeight + subchartHeight + legendHeightForBottom + $$.getCurrentPaddingBottom(),
            left: hasArc ? 0 : $$.getCurrentPaddingLeft()
        };

        // for subchart
        $$.margin2 = config.axis_rotated ? {
            top: $$.margin.top,
            right: NaN,
            bottom: 20 + legendHeightForBottom,
            left: $$.rotated_padding_left
        } : {
            top: $$.currentHeight - subchartHeight - legendHeightForBottom,
            right: NaN,
            bottom: xAxisHeight + legendHeightForBottom,
            left: $$.margin.left
        };

        // for legend
        $$.margin3 = {
            top: 0,
            right: NaN,
            bottom: 0,
            left: 0
        };
        if ($$.updateSizeForLegend) {
            $$.updateSizeForLegend(legendHeight, legendWidth);
        }

        $$.width = $$.currentWidth - $$.margin.left - $$.margin.right;
        $$.height = $$.currentHeight - $$.margin.top - $$.margin.bottom;
        if ($$.width < 0) {
            $$.width = 0;
        }
        if ($$.height < 0) {
            $$.height = 0;
        }

        $$.width2 = config.axis_rotated ? $$.margin.left - $$.rotated_padding_left - $$.rotated_padding_right : $$.width;
        $$.height2 = config.axis_rotated ? $$.height : $$.currentHeight - $$.margin2.top - $$.margin2.bottom;
        if ($$.width2 < 0) {
            $$.width2 = 0;
        }
        if ($$.height2 < 0) {
            $$.height2 = 0;
        }

        // for arc
        $$.arcWidth = $$.width - ($$.isLegendRight ? legendWidth + 10 : 0);
        $$.arcHeight = $$.height - ($$.isLegendRight ? 0 : 10);
        if ($$.hasType('gauge') && !config.gauge_fullCircle) {
            $$.arcHeight += $$.height - $$.getGaugeLabelHeight();
        }
        if ($$.updateRadius) {
            $$.updateRadius();
        }

        if ($$.isLegendRight && hasArc) {
            $$.margin3.left = $$.arcWidth / 2 + $$.radiusExpanded * 1.1;
        }
    };

    c3_chart_internal_fn.updateTargets = function (targets) {
        var $$ = this;

        /*-- Main --*/

        //-- Text --//
        $$.updateTargetsForText(targets);

        //-- Bar --//
        $$.updateTargetsForBar(targets);

        //-- Line --//
        $$.updateTargetsForLine(targets);

        //-- Arc --//
        if ($$.hasArcType() && $$.updateTargetsForArc) {
            $$.updateTargetsForArc(targets);
        }

        /*-- Sub --*/

        if ($$.updateTargetsForSubchart) {
            $$.updateTargetsForSubchart(targets);
        }

        // Fade-in each chart
        $$.showTargets();
    };
    c3_chart_internal_fn.showTargets = function () {
        var $$ = this;
        $$.svg.selectAll('.' + CLASS.target).filter(function (d) {
            return $$.isTargetToShow(d.id);
        }).transition().duration($$.config.transition_duration).style("opacity", 1);
    };

    c3_chart_internal_fn.redraw = function (options, transitions) {
        var $$ = this,
            main = $$.main,
            d3 = $$.d3,
            config = $$.config;
        var areaIndices = $$.getShapeIndices($$.isAreaType),
            barIndices = $$.getShapeIndices($$.isBarType),
            lineIndices = $$.getShapeIndices($$.isLineType);
        var withY, withSubchart, withTransition, withTransitionForExit, withTransitionForAxis, withTransform, withUpdateXDomain, withUpdateOrgXDomain, withTrimXDomain, withLegend, withEventRect, withDimension, withUpdateXAxis;
        var hideAxis = $$.hasArcType();
        var drawArea, drawBar, drawLine, xForText, yForText;
        var duration, durationForExit, durationForAxis;
        var transitionsToWait, waitForDraw, flow, transition;
        var targetsToShow = $$.filterTargetsToShow($$.data.targets),
            tickValues,
            i,
            intervalForCulling,
            xDomainForZoom;
        var xv = $$.xv.bind($$),
            cx,
            cy;

        options = options || {};
        withY = getOption(options, "withY", true);
        withSubchart = getOption(options, "withSubchart", true);
        withTransition = getOption(options, "withTransition", true);
        withTransform = getOption(options, "withTransform", false);
        withUpdateXDomain = getOption(options, "withUpdateXDomain", false);
        withUpdateOrgXDomain = getOption(options, "withUpdateOrgXDomain", false);
        withTrimXDomain = getOption(options, "withTrimXDomain", true);
        withUpdateXAxis = getOption(options, "withUpdateXAxis", withUpdateXDomain);
        withLegend = getOption(options, "withLegend", false);
        withEventRect = getOption(options, "withEventRect", true);
        withDimension = getOption(options, "withDimension", true);
        withTransitionForExit = getOption(options, "withTransitionForExit", withTransition);
        withTransitionForAxis = getOption(options, "withTransitionForAxis", withTransition);

        duration = withTransition ? config.transition_duration : 0;
        durationForExit = withTransitionForExit ? duration : 0;
        durationForAxis = withTransitionForAxis ? duration : 0;

        transitions = transitions || $$.axis.generateTransitions(durationForAxis);

        // update legend and transform each g
        if (withLegend && config.legend_show) {
            $$.updateLegend($$.mapToIds($$.data.targets), options, transitions);
        } else if (withDimension) {
            // need to update dimension (e.g. axis.y.tick.values) because y tick values should change
            // no need to update axis in it because they will be updated in redraw()
            $$.updateDimension(true);
        }

        // MEMO: needed for grids calculation
        if ($$.isCategorized() && targetsToShow.length === 0) {
            $$.x.domain([0, $$.axes.x.selectAll('.tick').size()]);
        }

        if (targetsToShow.length) {
            $$.updateXDomain(targetsToShow, withUpdateXDomain, withUpdateOrgXDomain, withTrimXDomain);
            if (!config.axis_x_tick_values) {
                tickValues = $$.axis.updateXAxisTickValues(targetsToShow);
            }
        } else {
            $$.xAxis.tickValues([]);
            $$.subXAxis.tickValues([]);
        }

        if (config.zoom_rescale && !options.flow) {
            xDomainForZoom = $$.x.orgDomain();
        }

        $$.y.domain($$.getYDomain(targetsToShow, 'y', xDomainForZoom));
        $$.y2.domain($$.getYDomain(targetsToShow, 'y2', xDomainForZoom));

        if (!config.axis_y_tick_values && config.axis_y_tick_count) {
            $$.yAxis.tickValues($$.axis.generateTickValues($$.y.domain(), config.axis_y_tick_count));
        }
        if (!config.axis_y2_tick_values && config.axis_y2_tick_count) {
            $$.y2Axis.tickValues($$.axis.generateTickValues($$.y2.domain(), config.axis_y2_tick_count));
        }

        // axes
        $$.axis.redraw(durationForAxis, hideAxis);

        // Update axis label
        $$.axis.updateLabels(withTransition);

        // show/hide if manual culling needed
        if ((withUpdateXDomain || withUpdateXAxis) && targetsToShow.length) {
            if (config.axis_x_tick_culling && tickValues) {
                for (i = 1; i < tickValues.length; i++) {
                    if (tickValues.length / i < config.axis_x_tick_culling_max) {
                        intervalForCulling = i;
                        break;
                    }
                }
                $$.svg.selectAll('.' + CLASS.axisX + ' .tick text').each(function (e) {
                    var index = tickValues.indexOf(e);
                    if (index >= 0) {
                        d3.select(this).style('display', index % intervalForCulling ? 'none' : 'block');
                    }
                });
            } else {
                $$.svg.selectAll('.' + CLASS.axisX + ' .tick text').style('display', 'block');
            }
        }

        // setup drawer - MEMO: these must be called after axis updated
        drawArea = $$.generateDrawArea ? $$.generateDrawArea(areaIndices, false) : undefined;
        drawBar = $$.generateDrawBar ? $$.generateDrawBar(barIndices) : undefined;
        drawLine = $$.generateDrawLine ? $$.generateDrawLine(lineIndices, false) : undefined;
        xForText = $$.generateXYForText(areaIndices, barIndices, lineIndices, true);
        yForText = $$.generateXYForText(areaIndices, barIndices, lineIndices, false);

        // update circleY based on updated parameters
        $$.updateCircleY();
        // generate circle x/y functions depending on updated params
        cx = ($$.config.axis_rotated ? $$.circleY : $$.circleX).bind($$);
        cy = ($$.config.axis_rotated ? $$.circleX : $$.circleY).bind($$);

        // Update sub domain
        if (withY) {
            $$.subY.domain($$.getYDomain(targetsToShow, 'y'));
            $$.subY2.domain($$.getYDomain(targetsToShow, 'y2'));
        }

        // xgrid focus
        $$.updateXgridFocus();

        // Data empty label positioning and text.
        main.select("text." + CLASS.text + '.' + CLASS.empty).attr("x", $$.width / 2).attr("y", $$.height / 2).text(config.data_empty_label_text).transition().style('opacity', targetsToShow.length ? 0 : 1);

        // event rect
        if (withEventRect) {
            $$.redrawEventRect();
        }

        // grid
        $$.updateGrid(duration);

        // rect for regions
        $$.updateRegion(duration);

        // bars
        $$.updateBar(durationForExit);

        // lines, areas and cricles
        $$.updateLine(durationForExit);
        $$.updateArea(durationForExit);
        $$.updateCircle(cx, cy);

        // text
        if ($$.hasDataLabel()) {
            $$.updateText(xForText, yForText, durationForExit);
        }

        // title
        if ($$.redrawTitle) {
            $$.redrawTitle();
        }

        // arc
        if ($$.redrawArc) {
            $$.redrawArc(duration, durationForExit, withTransform);
        }

        // subchart
        if ($$.redrawSubchart) {
            $$.redrawSubchart(withSubchart, transitions, duration, durationForExit, areaIndices, barIndices, lineIndices);
        }

        // circles for select
        main.selectAll('.' + CLASS.selectedCircles).filter($$.isBarType.bind($$)).selectAll('circle').remove();

        if (options.flow) {
            flow = $$.generateFlow({
                targets: targetsToShow,
                flow: options.flow,
                duration: options.flow.duration,
                drawBar: drawBar,
                drawLine: drawLine,
                drawArea: drawArea,
                cx: cx,
                cy: cy,
                xv: xv,
                xForText: xForText,
                yForText: yForText
            });
        }

        if ($$.isTabVisible()) {
            // Only use transition if tab visible. See #938.
            if (duration) {
                // transition should be derived from one transition
                transition = d3.transition().duration(duration);
                transitionsToWait = [];
                [$$.redrawBar(drawBar, true, transition), $$.redrawLine(drawLine, true, transition), $$.redrawArea(drawArea, true, transition), $$.redrawCircle(cx, cy, true, transition), $$.redrawText(xForText, yForText, options.flow, true, transition), $$.redrawRegion(true, transition), $$.redrawGrid(true, transition)].forEach(function (transitions) {
                    transitions.forEach(function (transition) {
                        transitionsToWait.push(transition);
                    });
                });
                // Wait for end of transitions to call flow and onrendered callback
                waitForDraw = $$.generateWait();
                transitionsToWait.forEach(function (t) {
                    waitForDraw.add(t);
                });
                waitForDraw(function () {
                    if (flow) {
                        flow();
                    }
                    if (config.onrendered) {
                        config.onrendered.call($$);
                    }
                });
            } else {
                $$.redrawBar(drawBar);
                $$.redrawLine(drawLine);
                $$.redrawArea(drawArea);
                $$.redrawCircle(cx, cy);
                $$.redrawText(xForText, yForText, options.flow);
                $$.redrawRegion();
                $$.redrawGrid();
                if (flow) {
                    flow();
                }
                if (config.onrendered) {
                    config.onrendered.call($$);
                }
            }
        }

        // update fadein condition
        $$.mapToIds($$.data.targets).forEach(function (id) {
            $$.withoutFadeIn[id] = true;
        });
    };

    c3_chart_internal_fn.updateAndRedraw = function (options) {
        var $$ = this,
            config = $$.config,
            transitions;
        options = options || {};
        // same with redraw
        options.withTransition = getOption(options, "withTransition", true);
        options.withTransform = getOption(options, "withTransform", false);
        options.withLegend = getOption(options, "withLegend", false);
        // NOT same with redraw
        options.withUpdateXDomain = getOption(options, "withUpdateXDomain", true);
        options.withUpdateOrgXDomain = getOption(options, "withUpdateOrgXDomain", true);
        options.withTransitionForExit = false;
        options.withTransitionForTransform = getOption(options, "withTransitionForTransform", options.withTransition);
        // MEMO: this needs to be called before updateLegend and it means this ALWAYS needs to be called)
        $$.updateSizes();
        // MEMO: called in updateLegend in redraw if withLegend
        if (!(options.withLegend && config.legend_show)) {
            transitions = $$.axis.generateTransitions(options.withTransitionForAxis ? config.transition_duration : 0);
            // Update scales
            $$.updateScales();
            $$.updateSvgSize();
            // Update g positions
            $$.transformAll(options.withTransitionForTransform, transitions);
        }
        // Draw with new sizes & scales
        $$.redraw(options, transitions);
    };
    c3_chart_internal_fn.redrawWithoutRescale = function () {
        this.redraw({
            withY: false,
            withSubchart: false,
            withEventRect: false,
            withTransitionForAxis: false
        });
    };

    c3_chart_internal_fn.isTimeSeries = function () {
        return this.config.axis_x_type === 'timeseries';
    };
    c3_chart_internal_fn.isCategorized = function () {
        return this.config.axis_x_type.indexOf('categor') >= 0;
    };
    c3_chart_internal_fn.isCustomX = function () {
        var $$ = this,
            config = $$.config;
        return !$$.isTimeSeries() && (config.data_x || notEmpty(config.data_xs));
    };

    c3_chart_internal_fn.isTimeSeriesY = function () {
        return this.config.axis_y_type === 'timeseries';
    };

    c3_chart_internal_fn.getTranslate = function (target) {
        var $$ = this,
            config = $$.config,
            x,
            y;
        if (target === 'main') {
            x = asHalfPixel($$.margin.left);
            y = asHalfPixel($$.margin.top);
        } else if (target === 'context') {
            x = asHalfPixel($$.margin2.left);
            y = asHalfPixel($$.margin2.top);
        } else if (target === 'legend') {
            x = $$.margin3.left;
            y = $$.margin3.top;
        } else if (target === 'x') {
            x = 0;
            y = config.axis_rotated ? 0 : $$.height;
        } else if (target === 'y') {
            x = 0;
            y = config.axis_rotated ? $$.height : 0;
        } else if (target === 'y2') {
            x = config.axis_rotated ? 0 : $$.width;
            y = config.axis_rotated ? 1 : 0;
        } else if (target === 'subx') {
            x = 0;
            y = config.axis_rotated ? 0 : $$.height2;
        } else if (target === 'arc') {
            x = $$.arcWidth / 2;
            y = $$.arcHeight / 2 - ($$.hasType('gauge') ? 6 : 0); // to prevent wrong display of min and max label
        }
        return "translate(" + x + "," + y + ")";
    };
    c3_chart_internal_fn.initialOpacity = function (d) {
        return d.value !== null && this.withoutFadeIn[d.id] ? 1 : 0;
    };
    c3_chart_internal_fn.initialOpacityForCircle = function (d) {
        return d.value !== null && this.withoutFadeIn[d.id] ? this.opacityForCircle(d) : 0;
    };
    c3_chart_internal_fn.opacityForCircle = function (d) {
        var isPointShouldBeShown = isFunction(this.config.point_show) ? this.config.point_show(d) : this.config.point_show;
        var opacity = isPointShouldBeShown ? 1 : 0;
        return isValue(d.value) ? this.isScatterType(d) ? 0.5 : opacity : 0;
    };
    c3_chart_internal_fn.opacityForText = function () {
        return this.hasDataLabel() ? 1 : 0;
    };
    c3_chart_internal_fn.xx = function (d) {
        return d ? this.x(d.x) : null;
    };
    c3_chart_internal_fn.xv = function (d) {
        var $$ = this,
            value = d.value;
        if ($$.isTimeSeries()) {
            value = $$.parseDate(d.value);
        } else if ($$.isCategorized() && typeof d.value === 'string') {
            value = $$.config.axis_x_categories.indexOf(d.value);
        }
        return Math.ceil($$.x(value));
    };
    c3_chart_internal_fn.yv = function (d) {
        var $$ = this,
            yScale = d.axis && d.axis === 'y2' ? $$.y2 : $$.y;
        return Math.ceil(yScale(d.value));
    };
    c3_chart_internal_fn.subxx = function (d) {
        return d ? this.subX(d.x) : null;
    };

    c3_chart_internal_fn.transformMain = function (withTransition, transitions) {
        var $$ = this,
            xAxis,
            yAxis,
            y2Axis;
        if (transitions && transitions.axisX) {
            xAxis = transitions.axisX;
        } else {
            xAxis = $$.main.select('.' + CLASS.axisX);
            if (withTransition) {
                xAxis = xAxis.transition();
            }
        }
        if (transitions && transitions.axisY) {
            yAxis = transitions.axisY;
        } else {
            yAxis = $$.main.select('.' + CLASS.axisY);
            if (withTransition) {
                yAxis = yAxis.transition();
            }
        }
        if (transitions && transitions.axisY2) {
            y2Axis = transitions.axisY2;
        } else {
            y2Axis = $$.main.select('.' + CLASS.axisY2);
            if (withTransition) {
                y2Axis = y2Axis.transition();
            }
        }
        (withTransition ? $$.main.transition() : $$.main).attr("transform", $$.getTranslate('main'));
        xAxis.attr("transform", $$.getTranslate('x'));
        yAxis.attr("transform", $$.getTranslate('y'));
        y2Axis.attr("transform", $$.getTranslate('y2'));
        $$.main.select('.' + CLASS.chartArcs).attr("transform", $$.getTranslate('arc'));
    };
    c3_chart_internal_fn.transformAll = function (withTransition, transitions) {
        var $$ = this;
        $$.transformMain(withTransition, transitions);
        if ($$.config.subchart_show) {
            $$.transformContext(withTransition, transitions);
        }
        if ($$.legend) {
            $$.transformLegend(withTransition);
        }
    };

    c3_chart_internal_fn.updateSvgSize = function () {
        var $$ = this,
            brush = $$.svg.select(".c3-brush .overlay");
        $$.svg.attr('width', $$.currentWidth).attr('height', $$.currentHeight);
        $$.svg.selectAll(['#' + $$.clipId, '#' + $$.clipIdForGrid]).select('rect').attr('width', $$.width).attr('height', $$.height);
        $$.svg.select('#' + $$.clipIdForXAxis).select('rect').attr('x', $$.getXAxisClipX.bind($$)).attr('y', $$.getXAxisClipY.bind($$)).attr('width', $$.getXAxisClipWidth.bind($$)).attr('height', $$.getXAxisClipHeight.bind($$));
        $$.svg.select('#' + $$.clipIdForYAxis).select('rect').attr('x', $$.getYAxisClipX.bind($$)).attr('y', $$.getYAxisClipY.bind($$)).attr('width', $$.getYAxisClipWidth.bind($$)).attr('height', $$.getYAxisClipHeight.bind($$));
        $$.svg.select('#' + $$.clipIdForSubchart).select('rect').attr('width', $$.width).attr('height', brush.size() ? brush.attr('height') : 0);
        // MEMO: parent div's height will be bigger than svg when <!DOCTYPE html>
        $$.selectChart.style('max-height', $$.currentHeight + "px");
    };

    c3_chart_internal_fn.updateDimension = function (withoutAxis) {
        var $$ = this;
        if (!withoutAxis) {
            if ($$.config.axis_rotated) {
                $$.axes.x.call($$.xAxis);
                $$.axes.subx.call($$.subXAxis);
            } else {
                $$.axes.y.call($$.yAxis);
                $$.axes.y2.call($$.y2Axis);
            }
        }
        $$.updateSizes();
        $$.updateScales();
        $$.updateSvgSize();
        $$.transformAll(false);
    };

    c3_chart_internal_fn.observeInserted = function (selection) {
        var $$ = this,
            observer;
        if (typeof MutationObserver === 'undefined') {
            window.console.error("MutationObserver not defined.");
            return;
        }
        observer = new MutationObserver(function (mutations) {
            mutations.forEach(function (mutation) {
                if (mutation.type === 'childList' && mutation.previousSibling) {
                    observer.disconnect();
                    // need to wait for completion of load because size calculation requires the actual sizes determined after that completion
                    $$.intervalForObserveInserted = window.setInterval(function () {
                        // parentNode will NOT be null when completed
                        if (selection.node().parentNode) {
                            window.clearInterval($$.intervalForObserveInserted);
                            $$.updateDimension();
                            if ($$.brush) {
                                $$.brush.update();
                            }
                            $$.config.oninit.call($$);
                            $$.redraw({
                                withTransform: true,
                                withUpdateXDomain: true,
                                withUpdateOrgXDomain: true,
                                withTransition: false,
                                withTransitionForTransform: false,
                                withLegend: true
                            });
                            selection.transition().style('opacity', 1);
                        }
                    }, 10);
                }
            });
        });
        observer.observe(selection.node(), { attributes: true, childList: true, characterData: true });
    };

    c3_chart_internal_fn.bindResize = function () {
        var $$ = this,
            config = $$.config;

        $$.resizeFunction = $$.generateResize(); // need to call .remove

        $$.resizeFunction.add(function () {
            config.onresize.call($$);
        });
        if (config.resize_auto) {
            $$.resizeFunction.add(function () {
                if ($$.resizeTimeout !== undefined) {
                    window.clearTimeout($$.resizeTimeout);
                }
                $$.resizeTimeout = window.setTimeout(function () {
                    delete $$.resizeTimeout;
                    $$.updateAndRedraw({
                        withUpdateXDomain: false,
                        withUpdateOrgXDomain: false,
                        withTransition: false,
                        withTransitionForTransform: false,
                        withLegend: true
                    });
                    if ($$.brush) {
                        $$.brush.update();
                    }
                }, 100);
            });
        }
        $$.resizeFunction.add(function () {
            config.onresized.call($$);
        });

        $$.resizeIfElementDisplayed = function () {
            // if element not displayed skip it
            if ($$.api == null || !$$.api.element.offsetParent) {
                return;
            }

            $$.resizeFunction();
        };

        if (window.attachEvent) {
            window.attachEvent('onresize', $$.resizeIfElementDisplayed);
        } else if (window.addEventListener) {
            window.addEventListener('resize', $$.resizeIfElementDisplayed, false);
        } else {
            // fallback to this, if this is a very old browser
            var wrapper = window.onresize;
            if (!wrapper) {
                // create a wrapper that will call all charts
                wrapper = $$.generateResize();
            } else if (!wrapper.add || !wrapper.remove) {
                // there is already a handler registered, make sure we call it too
                wrapper = $$.generateResize();
                wrapper.add(window.onresize);
            }
            // add this graph to the wrapper, we will be removed if the user calls destroy
            wrapper.add($$.resizeFunction);
            window.onresize = function () {
                // if element not displayed skip it
                if (!$$.api.element.offsetParent) {
                    return;
                }

                wrapper();
            };
        }
    };

    c3_chart_internal_fn.generateResize = function () {
        var resizeFunctions = [];
        function callResizeFunctions() {
            resizeFunctions.forEach(function (f) {
                f();
            });
        }
        callResizeFunctions.add = function (f) {
            resizeFunctions.push(f);
        };
        callResizeFunctions.remove = function (f) {
            for (var i = 0; i < resizeFunctions.length; i++) {
                if (resizeFunctions[i] === f) {
                    resizeFunctions.splice(i, 1);
                    break;
                }
            }
        };
        return callResizeFunctions;
    };

    c3_chart_internal_fn.endall = function (transition, callback) {
        var n = 0;
        transition.each(function () {
            ++n;
        }).on("end", function () {
            if (! --n) {
                callback.apply(this, arguments);
            }
        });
    };
    c3_chart_internal_fn.generateWait = function () {
        var transitionsToWait = [],
            f = function f(callback) {
            var timer = setInterval(function () {
                var done = 0;
                transitionsToWait.forEach(function (t) {
                    if (t.empty()) {
                        done += 1;
                        return;
                    }
                    try {
                        t.transition();
                    } catch (e) {
                        done += 1;
                    }
                });
                if (done === transitionsToWait.length) {
                    clearInterval(timer);
                    if (callback) {
                        callback();
                    }
                }
            }, 50);
        };
        f.add = function (transition) {
            transitionsToWait.push(transition);
        };
        return f;
    };

    c3_chart_internal_fn.parseDate = function (date) {
        var $$ = this,
            parsedDate;
        if (date instanceof Date) {
            parsedDate = date;
        } else if (typeof date === 'string') {
            parsedDate = $$.dataTimeParse(date);
        } else if ((typeof date === 'undefined' ? 'undefined' : _typeof(date)) === 'object') {
            parsedDate = new Date(+date);
        } else if (typeof date === 'number' && !isNaN(date)) {
            parsedDate = new Date(+date);
        }
        if (!parsedDate || isNaN(+parsedDate)) {
            window.console.error("Failed to parse x '" + date + "' to Date object");
        }
        return parsedDate;
    };

    c3_chart_internal_fn.isTabVisible = function () {
        var hidden;
        if (typeof document.hidden !== "undefined") {
            // Opera 12.10 and Firefox 18 and later support
            hidden = "hidden";
        } else if (typeof document.mozHidden !== "undefined") {
            hidden = "mozHidden";
        } else if (typeof document.msHidden !== "undefined") {
            hidden = "msHidden";
        } else if (typeof document.webkitHidden !== "undefined") {
            hidden = "webkitHidden";
        }

        return document[hidden] ? false : true;
    };

    c3_chart_internal_fn.isValue = isValue;
    c3_chart_internal_fn.isFunction = isFunction;
    c3_chart_internal_fn.isString = isString;
    c3_chart_internal_fn.isUndefined = isUndefined;
    c3_chart_internal_fn.isDefined = isDefined;
    c3_chart_internal_fn.ceil10 = ceil10;
    c3_chart_internal_fn.asHalfPixel = asHalfPixel;
    c3_chart_internal_fn.diffDomain = diffDomain;
    c3_chart_internal_fn.isEmpty = isEmpty;
    c3_chart_internal_fn.notEmpty = notEmpty;
    c3_chart_internal_fn.notEmpty = notEmpty;
    c3_chart_internal_fn.getOption = getOption;
    c3_chart_internal_fn.hasValue = hasValue;
    c3_chart_internal_fn.sanitise = sanitise;
    c3_chart_internal_fn.getPathBox = getPathBox;
    c3_chart_internal_fn.CLASS = CLASS;

    /* jshint ignore:start */

    // PhantomJS doesn't have support for Function.prototype.bind, which has caused confusion. Use
    // this polyfill to avoid the confusion.
    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/bind#Polyfill

    if (!Function.prototype.bind) {
        Function.prototype.bind = function (oThis) {
            if (typeof this !== 'function') {
                // closest thing possible to the ECMAScript 5
                // internal IsCallable function
                throw new TypeError('Function.prototype.bind - what is trying to be bound is not callable');
            }

            var aArgs = Array.prototype.slice.call(arguments, 1),
                fToBind = this,
                fNOP = function fNOP() {},
                fBound = function fBound() {
                return fToBind.apply(this instanceof fNOP ? this : oThis, aArgs.concat(Array.prototype.slice.call(arguments)));
            };

            fNOP.prototype = this.prototype;
            fBound.prototype = new fNOP();

            return fBound;
        };
    }

    // SVGPathSeg API polyfill
    // https://github.com/progers/pathseg
    //
    // This is a drop-in replacement for the SVGPathSeg and SVGPathSegList APIs that were removed from
    // SVG2 (https://lists.w3.org/Archives/Public/www-svg/2015Jun/0044.html), including the latest spec
    // changes which were implemented in Firefox 43 and Chrome 46.

    (function () {

        if (!("SVGPathSeg" in window)) {
            // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-InterfaceSVGPathSeg
            window.SVGPathSeg = function (type, typeAsLetter, owningPathSegList) {
                this.pathSegType = type;
                this.pathSegTypeAsLetter = typeAsLetter;
                this._owningPathSegList = owningPathSegList;
            };

            window.SVGPathSeg.prototype.classname = "SVGPathSeg";

            window.SVGPathSeg.PATHSEG_UNKNOWN = 0;
            window.SVGPathSeg.PATHSEG_CLOSEPATH = 1;
            window.SVGPathSeg.PATHSEG_MOVETO_ABS = 2;
            window.SVGPathSeg.PATHSEG_MOVETO_REL = 3;
            window.SVGPathSeg.PATHSEG_LINETO_ABS = 4;
            window.SVGPathSeg.PATHSEG_LINETO_REL = 5;
            window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS = 6;
            window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_REL = 7;
            window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_ABS = 8;
            window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_REL = 9;
            window.SVGPathSeg.PATHSEG_ARC_ABS = 10;
            window.SVGPathSeg.PATHSEG_ARC_REL = 11;
            window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_ABS = 12;
            window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_REL = 13;
            window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_ABS = 14;
            window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_REL = 15;
            window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_ABS = 16;
            window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_REL = 17;
            window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS = 18;
            window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL = 19;

            // Notify owning PathSegList on any changes so they can be synchronized back to the path element.
            window.SVGPathSeg.prototype._segmentChanged = function () {
                if (this._owningPathSegList) this._owningPathSegList.segmentChanged(this);
            };

            window.SVGPathSegClosePath = function (owningPathSegList) {
                window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CLOSEPATH, "z", owningPathSegList);
            };
            window.SVGPathSegClosePath.prototype = Object.create(window.SVGPathSeg.prototype);
            window.SVGPathSegClosePath.prototype.toString = function () {
                return "[object SVGPathSegClosePath]";
            };
            window.SVGPathSegClosePath.prototype._asPathString = function () {
                return this.pathSegTypeAsLetter;
            };
            window.SVGPathSegClosePath.prototype.clone = function () {
                return new window.SVGPathSegClosePath(undefined);
            };

            window.SVGPathSegMovetoAbs = function (owningPathSegList, x, y) {
                window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_MOVETO_ABS, "M", owningPathSegList);
                this._x = x;
                this._y = y;
            };
            window.SVGPathSegMovetoAbs.prototype = Object.create(window.SVGPathSeg.prototype);
            window.SVGPathSegMovetoAbs.prototype.toString = function () {
                return "[object SVGPathSegMovetoAbs]";
            };
            window.SVGPathSegMovetoAbs.prototype._asPathString = function () {
                return this.pathSegTypeAsLetter + " " + this._x + " " + this._y;
            };
            window.SVGPathSegMovetoAbs.prototype.clone = function () {
                return new window.SVGPathSegMovetoAbs(undefined, this._x, this._y);
            };
            Object.defineProperty(window.SVGPathSegMovetoAbs.prototype, "x", { get: function get() {
                    return this._x;
                }, set: function set(x) {
                    this._x = x;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegMovetoAbs.prototype, "y", { get: function get() {
                    return this._y;
                }, set: function set(y) {
                    this._y = y;this._segmentChanged();
                }, enumerable: true });

            window.SVGPathSegMovetoRel = function (owningPathSegList, x, y) {
                window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_MOVETO_REL, "m", owningPathSegList);
                this._x = x;
                this._y = y;
            };
            window.SVGPathSegMovetoRel.prototype = Object.create(window.SVGPathSeg.prototype);
            window.SVGPathSegMovetoRel.prototype.toString = function () {
                return "[object SVGPathSegMovetoRel]";
            };
            window.SVGPathSegMovetoRel.prototype._asPathString = function () {
                return this.pathSegTypeAsLetter + " " + this._x + " " + this._y;
            };
            window.SVGPathSegMovetoRel.prototype.clone = function () {
                return new window.SVGPathSegMovetoRel(undefined, this._x, this._y);
            };
            Object.defineProperty(window.SVGPathSegMovetoRel.prototype, "x", { get: function get() {
                    return this._x;
                }, set: function set(x) {
                    this._x = x;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegMovetoRel.prototype, "y", { get: function get() {
                    return this._y;
                }, set: function set(y) {
                    this._y = y;this._segmentChanged();
                }, enumerable: true });

            window.SVGPathSegLinetoAbs = function (owningPathSegList, x, y) {
                window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_LINETO_ABS, "L", owningPathSegList);
                this._x = x;
                this._y = y;
            };
            window.SVGPathSegLinetoAbs.prototype = Object.create(window.SVGPathSeg.prototype);
            window.SVGPathSegLinetoAbs.prototype.toString = function () {
                return "[object SVGPathSegLinetoAbs]";
            };
            window.SVGPathSegLinetoAbs.prototype._asPathString = function () {
                return this.pathSegTypeAsLetter + " " + this._x + " " + this._y;
            };
            window.SVGPathSegLinetoAbs.prototype.clone = function () {
                return new window.SVGPathSegLinetoAbs(undefined, this._x, this._y);
            };
            Object.defineProperty(window.SVGPathSegLinetoAbs.prototype, "x", { get: function get() {
                    return this._x;
                }, set: function set(x) {
                    this._x = x;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegLinetoAbs.prototype, "y", { get: function get() {
                    return this._y;
                }, set: function set(y) {
                    this._y = y;this._segmentChanged();
                }, enumerable: true });

            window.SVGPathSegLinetoRel = function (owningPathSegList, x, y) {
                window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_LINETO_REL, "l", owningPathSegList);
                this._x = x;
                this._y = y;
            };
            window.SVGPathSegLinetoRel.prototype = Object.create(window.SVGPathSeg.prototype);
            window.SVGPathSegLinetoRel.prototype.toString = function () {
                return "[object SVGPathSegLinetoRel]";
            };
            window.SVGPathSegLinetoRel.prototype._asPathString = function () {
                return this.pathSegTypeAsLetter + " " + this._x + " " + this._y;
            };
            window.SVGPathSegLinetoRel.prototype.clone = function () {
                return new window.SVGPathSegLinetoRel(undefined, this._x, this._y);
            };
            Object.defineProperty(window.SVGPathSegLinetoRel.prototype, "x", { get: function get() {
                    return this._x;
                }, set: function set(x) {
                    this._x = x;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegLinetoRel.prototype, "y", { get: function get() {
                    return this._y;
                }, set: function set(y) {
                    this._y = y;this._segmentChanged();
                }, enumerable: true });

            window.SVGPathSegCurvetoCubicAbs = function (owningPathSegList, x, y, x1, y1, x2, y2) {
                window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS, "C", owningPathSegList);
                this._x = x;
                this._y = y;
                this._x1 = x1;
                this._y1 = y1;
                this._x2 = x2;
                this._y2 = y2;
            };
            window.SVGPathSegCurvetoCubicAbs.prototype = Object.create(window.SVGPathSeg.prototype);
            window.SVGPathSegCurvetoCubicAbs.prototype.toString = function () {
                return "[object SVGPathSegCurvetoCubicAbs]";
            };
            window.SVGPathSegCurvetoCubicAbs.prototype._asPathString = function () {
                return this.pathSegTypeAsLetter + " " + this._x1 + " " + this._y1 + " " + this._x2 + " " + this._y2 + " " + this._x + " " + this._y;
            };
            window.SVGPathSegCurvetoCubicAbs.prototype.clone = function () {
                return new window.SVGPathSegCurvetoCubicAbs(undefined, this._x, this._y, this._x1, this._y1, this._x2, this._y2);
            };
            Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, "x", { get: function get() {
                    return this._x;
                }, set: function set(x) {
                    this._x = x;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, "y", { get: function get() {
                    return this._y;
                }, set: function set(y) {
                    this._y = y;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, "x1", { get: function get() {
                    return this._x1;
                }, set: function set(x1) {
                    this._x1 = x1;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, "y1", { get: function get() {
                    return this._y1;
                }, set: function set(y1) {
                    this._y1 = y1;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, "x2", { get: function get() {
                    return this._x2;
                }, set: function set(x2) {
                    this._x2 = x2;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, "y2", { get: function get() {
                    return this._y2;
                }, set: function set(y2) {
                    this._y2 = y2;this._segmentChanged();
                }, enumerable: true });

            window.SVGPathSegCurvetoCubicRel = function (owningPathSegList, x, y, x1, y1, x2, y2) {
                window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_REL, "c", owningPathSegList);
                this._x = x;
                this._y = y;
                this._x1 = x1;
                this._y1 = y1;
                this._x2 = x2;
                this._y2 = y2;
            };
            window.SVGPathSegCurvetoCubicRel.prototype = Object.create(window.SVGPathSeg.prototype);
            window.SVGPathSegCurvetoCubicRel.prototype.toString = function () {
                return "[object SVGPathSegCurvetoCubicRel]";
            };
            window.SVGPathSegCurvetoCubicRel.prototype._asPathString = function () {
                return this.pathSegTypeAsLetter + " " + this._x1 + " " + this._y1 + " " + this._x2 + " " + this._y2 + " " + this._x + " " + this._y;
            };
            window.SVGPathSegCurvetoCubicRel.prototype.clone = function () {
                return new window.SVGPathSegCurvetoCubicRel(undefined, this._x, this._y, this._x1, this._y1, this._x2, this._y2);
            };
            Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, "x", { get: function get() {
                    return this._x;
                }, set: function set(x) {
                    this._x = x;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, "y", { get: function get() {
                    return this._y;
                }, set: function set(y) {
                    this._y = y;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, "x1", { get: function get() {
                    return this._x1;
                }, set: function set(x1) {
                    this._x1 = x1;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, "y1", { get: function get() {
                    return this._y1;
                }, set: function set(y1) {
                    this._y1 = y1;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, "x2", { get: function get() {
                    return this._x2;
                }, set: function set(x2) {
                    this._x2 = x2;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, "y2", { get: function get() {
                    return this._y2;
                }, set: function set(y2) {
                    this._y2 = y2;this._segmentChanged();
                }, enumerable: true });

            window.SVGPathSegCurvetoQuadraticAbs = function (owningPathSegList, x, y, x1, y1) {
                window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_ABS, "Q", owningPathSegList);
                this._x = x;
                this._y = y;
                this._x1 = x1;
                this._y1 = y1;
            };
            window.SVGPathSegCurvetoQuadraticAbs.prototype = Object.create(window.SVGPathSeg.prototype);
            window.SVGPathSegCurvetoQuadraticAbs.prototype.toString = function () {
                return "[object SVGPathSegCurvetoQuadraticAbs]";
            };
            window.SVGPathSegCurvetoQuadraticAbs.prototype._asPathString = function () {
                return this.pathSegTypeAsLetter + " " + this._x1 + " " + this._y1 + " " + this._x + " " + this._y;
            };
            window.SVGPathSegCurvetoQuadraticAbs.prototype.clone = function () {
                return new window.SVGPathSegCurvetoQuadraticAbs(undefined, this._x, this._y, this._x1, this._y1);
            };
            Object.defineProperty(window.SVGPathSegCurvetoQuadraticAbs.prototype, "x", { get: function get() {
                    return this._x;
                }, set: function set(x) {
                    this._x = x;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegCurvetoQuadraticAbs.prototype, "y", { get: function get() {
                    return this._y;
                }, set: function set(y) {
                    this._y = y;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegCurvetoQuadraticAbs.prototype, "x1", { get: function get() {
                    return this._x1;
                }, set: function set(x1) {
                    this._x1 = x1;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegCurvetoQuadraticAbs.prototype, "y1", { get: function get() {
                    return this._y1;
                }, set: function set(y1) {
                    this._y1 = y1;this._segmentChanged();
                }, enumerable: true });

            window.SVGPathSegCurvetoQuadraticRel = function (owningPathSegList, x, y, x1, y1) {
                window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_REL, "q", owningPathSegList);
                this._x = x;
                this._y = y;
                this._x1 = x1;
                this._y1 = y1;
            };
            window.SVGPathSegCurvetoQuadraticRel.prototype = Object.create(window.SVGPathSeg.prototype);
            window.SVGPathSegCurvetoQuadraticRel.prototype.toString = function () {
                return "[object SVGPathSegCurvetoQuadraticRel]";
            };
            window.SVGPathSegCurvetoQuadraticRel.prototype._asPathString = function () {
                return this.pathSegTypeAsLetter + " " + this._x1 + " " + this._y1 + " " + this._x + " " + this._y;
            };
            window.SVGPathSegCurvetoQuadraticRel.prototype.clone = function () {
                return new window.SVGPathSegCurvetoQuadraticRel(undefined, this._x, this._y, this._x1, this._y1);
            };
            Object.defineProperty(window.SVGPathSegCurvetoQuadraticRel.prototype, "x", { get: function get() {
                    return this._x;
                }, set: function set(x) {
                    this._x = x;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegCurvetoQuadraticRel.prototype, "y", { get: function get() {
                    return this._y;
                }, set: function set(y) {
                    this._y = y;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegCurvetoQuadraticRel.prototype, "x1", { get: function get() {
                    return this._x1;
                }, set: function set(x1) {
                    this._x1 = x1;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegCurvetoQuadraticRel.prototype, "y1", { get: function get() {
                    return this._y1;
                }, set: function set(y1) {
                    this._y1 = y1;this._segmentChanged();
                }, enumerable: true });

            window.SVGPathSegArcAbs = function (owningPathSegList, x, y, r1, r2, angle, largeArcFlag, sweepFlag) {
                window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_ARC_ABS, "A", owningPathSegList);
                this._x = x;
                this._y = y;
                this._r1 = r1;
                this._r2 = r2;
                this._angle = angle;
                this._largeArcFlag = largeArcFlag;
                this._sweepFlag = sweepFlag;
            };
            window.SVGPathSegArcAbs.prototype = Object.create(window.SVGPathSeg.prototype);
            window.SVGPathSegArcAbs.prototype.toString = function () {
                return "[object SVGPathSegArcAbs]";
            };
            window.SVGPathSegArcAbs.prototype._asPathString = function () {
                return this.pathSegTypeAsLetter + " " + this._r1 + " " + this._r2 + " " + this._angle + " " + (this._largeArcFlag ? "1" : "0") + " " + (this._sweepFlag ? "1" : "0") + " " + this._x + " " + this._y;
            };
            window.SVGPathSegArcAbs.prototype.clone = function () {
                return new window.SVGPathSegArcAbs(undefined, this._x, this._y, this._r1, this._r2, this._angle, this._largeArcFlag, this._sweepFlag);
            };
            Object.defineProperty(window.SVGPathSegArcAbs.prototype, "x", { get: function get() {
                    return this._x;
                }, set: function set(x) {
                    this._x = x;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegArcAbs.prototype, "y", { get: function get() {
                    return this._y;
                }, set: function set(y) {
                    this._y = y;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegArcAbs.prototype, "r1", { get: function get() {
                    return this._r1;
                }, set: function set(r1) {
                    this._r1 = r1;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegArcAbs.prototype, "r2", { get: function get() {
                    return this._r2;
                }, set: function set(r2) {
                    this._r2 = r2;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegArcAbs.prototype, "angle", { get: function get() {
                    return this._angle;
                }, set: function set(angle) {
                    this._angle = angle;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegArcAbs.prototype, "largeArcFlag", { get: function get() {
                    return this._largeArcFlag;
                }, set: function set(largeArcFlag) {
                    this._largeArcFlag = largeArcFlag;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegArcAbs.prototype, "sweepFlag", { get: function get() {
                    return this._sweepFlag;
                }, set: function set(sweepFlag) {
                    this._sweepFlag = sweepFlag;this._segmentChanged();
                }, enumerable: true });

            window.SVGPathSegArcRel = function (owningPathSegList, x, y, r1, r2, angle, largeArcFlag, sweepFlag) {
                window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_ARC_REL, "a", owningPathSegList);
                this._x = x;
                this._y = y;
                this._r1 = r1;
                this._r2 = r2;
                this._angle = angle;
                this._largeArcFlag = largeArcFlag;
                this._sweepFlag = sweepFlag;
            };
            window.SVGPathSegArcRel.prototype = Object.create(window.SVGPathSeg.prototype);
            window.SVGPathSegArcRel.prototype.toString = function () {
                return "[object SVGPathSegArcRel]";
            };
            window.SVGPathSegArcRel.prototype._asPathString = function () {
                return this.pathSegTypeAsLetter + " " + this._r1 + " " + this._r2 + " " + this._angle + " " + (this._largeArcFlag ? "1" : "0") + " " + (this._sweepFlag ? "1" : "0") + " " + this._x + " " + this._y;
            };
            window.SVGPathSegArcRel.prototype.clone = function () {
                return new window.SVGPathSegArcRel(undefined, this._x, this._y, this._r1, this._r2, this._angle, this._largeArcFlag, this._sweepFlag);
            };
            Object.defineProperty(window.SVGPathSegArcRel.prototype, "x", { get: function get() {
                    return this._x;
                }, set: function set(x) {
                    this._x = x;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegArcRel.prototype, "y", { get: function get() {
                    return this._y;
                }, set: function set(y) {
                    this._y = y;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegArcRel.prototype, "r1", { get: function get() {
                    return this._r1;
                }, set: function set(r1) {
                    this._r1 = r1;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegArcRel.prototype, "r2", { get: function get() {
                    return this._r2;
                }, set: function set(r2) {
                    this._r2 = r2;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegArcRel.prototype, "angle", { get: function get() {
                    return this._angle;
                }, set: function set(angle) {
                    this._angle = angle;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegArcRel.prototype, "largeArcFlag", { get: function get() {
                    return this._largeArcFlag;
                }, set: function set(largeArcFlag) {
                    this._largeArcFlag = largeArcFlag;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegArcRel.prototype, "sweepFlag", { get: function get() {
                    return this._sweepFlag;
                }, set: function set(sweepFlag) {
                    this._sweepFlag = sweepFlag;this._segmentChanged();
                }, enumerable: true });

            window.SVGPathSegLinetoHorizontalAbs = function (owningPathSegList, x) {
                window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_ABS, "H", owningPathSegList);
                this._x = x;
            };
            window.SVGPathSegLinetoHorizontalAbs.prototype = Object.create(window.SVGPathSeg.prototype);
            window.SVGPathSegLinetoHorizontalAbs.prototype.toString = function () {
                return "[object SVGPathSegLinetoHorizontalAbs]";
            };
            window.SVGPathSegLinetoHorizontalAbs.prototype._asPathString = function () {
                return this.pathSegTypeAsLetter + " " + this._x;
            };
            window.SVGPathSegLinetoHorizontalAbs.prototype.clone = function () {
                return new window.SVGPathSegLinetoHorizontalAbs(undefined, this._x);
            };
            Object.defineProperty(window.SVGPathSegLinetoHorizontalAbs.prototype, "x", { get: function get() {
                    return this._x;
                }, set: function set(x) {
                    this._x = x;this._segmentChanged();
                }, enumerable: true });

            window.SVGPathSegLinetoHorizontalRel = function (owningPathSegList, x) {
                window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_REL, "h", owningPathSegList);
                this._x = x;
            };
            window.SVGPathSegLinetoHorizontalRel.prototype = Object.create(window.SVGPathSeg.prototype);
            window.SVGPathSegLinetoHorizontalRel.prototype.toString = function () {
                return "[object SVGPathSegLinetoHorizontalRel]";
            };
            window.SVGPathSegLinetoHorizontalRel.prototype._asPathString = function () {
                return this.pathSegTypeAsLetter + " " + this._x;
            };
            window.SVGPathSegLinetoHorizontalRel.prototype.clone = function () {
                return new window.SVGPathSegLinetoHorizontalRel(undefined, this._x);
            };
            Object.defineProperty(window.SVGPathSegLinetoHorizontalRel.prototype, "x", { get: function get() {
                    return this._x;
                }, set: function set(x) {
                    this._x = x;this._segmentChanged();
                }, enumerable: true });

            window.SVGPathSegLinetoVerticalAbs = function (owningPathSegList, y) {
                window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_ABS, "V", owningPathSegList);
                this._y = y;
            };
            window.SVGPathSegLinetoVerticalAbs.prototype = Object.create(window.SVGPathSeg.prototype);
            window.SVGPathSegLinetoVerticalAbs.prototype.toString = function () {
                return "[object SVGPathSegLinetoVerticalAbs]";
            };
            window.SVGPathSegLinetoVerticalAbs.prototype._asPathString = function () {
                return this.pathSegTypeAsLetter + " " + this._y;
            };
            window.SVGPathSegLinetoVerticalAbs.prototype.clone = function () {
                return new window.SVGPathSegLinetoVerticalAbs(undefined, this._y);
            };
            Object.defineProperty(window.SVGPathSegLinetoVerticalAbs.prototype, "y", { get: function get() {
                    return this._y;
                }, set: function set(y) {
                    this._y = y;this._segmentChanged();
                }, enumerable: true });

            window.SVGPathSegLinetoVerticalRel = function (owningPathSegList, y) {
                window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_REL, "v", owningPathSegList);
                this._y = y;
            };
            window.SVGPathSegLinetoVerticalRel.prototype = Object.create(window.SVGPathSeg.prototype);
            window.SVGPathSegLinetoVerticalRel.prototype.toString = function () {
                return "[object SVGPathSegLinetoVerticalRel]";
            };
            window.SVGPathSegLinetoVerticalRel.prototype._asPathString = function () {
                return this.pathSegTypeAsLetter + " " + this._y;
            };
            window.SVGPathSegLinetoVerticalRel.prototype.clone = function () {
                return new window.SVGPathSegLinetoVerticalRel(undefined, this._y);
            };
            Object.defineProperty(window.SVGPathSegLinetoVerticalRel.prototype, "y", { get: function get() {
                    return this._y;
                }, set: function set(y) {
                    this._y = y;this._segmentChanged();
                }, enumerable: true });

            window.SVGPathSegCurvetoCubicSmoothAbs = function (owningPathSegList, x, y, x2, y2) {
                window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_ABS, "S", owningPathSegList);
                this._x = x;
                this._y = y;
                this._x2 = x2;
                this._y2 = y2;
            };
            window.SVGPathSegCurvetoCubicSmoothAbs.prototype = Object.create(window.SVGPathSeg.prototype);
            window.SVGPathSegCurvetoCubicSmoothAbs.prototype.toString = function () {
                return "[object SVGPathSegCurvetoCubicSmoothAbs]";
            };
            window.SVGPathSegCurvetoCubicSmoothAbs.prototype._asPathString = function () {
                return this.pathSegTypeAsLetter + " " + this._x2 + " " + this._y2 + " " + this._x + " " + this._y;
            };
            window.SVGPathSegCurvetoCubicSmoothAbs.prototype.clone = function () {
                return new window.SVGPathSegCurvetoCubicSmoothAbs(undefined, this._x, this._y, this._x2, this._y2);
            };
            Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothAbs.prototype, "x", { get: function get() {
                    return this._x;
                }, set: function set(x) {
                    this._x = x;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothAbs.prototype, "y", { get: function get() {
                    return this._y;
                }, set: function set(y) {
                    this._y = y;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothAbs.prototype, "x2", { get: function get() {
                    return this._x2;
                }, set: function set(x2) {
                    this._x2 = x2;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothAbs.prototype, "y2", { get: function get() {
                    return this._y2;
                }, set: function set(y2) {
                    this._y2 = y2;this._segmentChanged();
                }, enumerable: true });

            window.SVGPathSegCurvetoCubicSmoothRel = function (owningPathSegList, x, y, x2, y2) {
                window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_REL, "s", owningPathSegList);
                this._x = x;
                this._y = y;
                this._x2 = x2;
                this._y2 = y2;
            };
            window.SVGPathSegCurvetoCubicSmoothRel.prototype = Object.create(window.SVGPathSeg.prototype);
            window.SVGPathSegCurvetoCubicSmoothRel.prototype.toString = function () {
                return "[object SVGPathSegCurvetoCubicSmoothRel]";
            };
            window.SVGPathSegCurvetoCubicSmoothRel.prototype._asPathString = function () {
                return this.pathSegTypeAsLetter + " " + this._x2 + " " + this._y2 + " " + this._x + " " + this._y;
            };
            window.SVGPathSegCurvetoCubicSmoothRel.prototype.clone = function () {
                return new window.SVGPathSegCurvetoCubicSmoothRel(undefined, this._x, this._y, this._x2, this._y2);
            };
            Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothRel.prototype, "x", { get: function get() {
                    return this._x;
                }, set: function set(x) {
                    this._x = x;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothRel.prototype, "y", { get: function get() {
                    return this._y;
                }, set: function set(y) {
                    this._y = y;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothRel.prototype, "x2", { get: function get() {
                    return this._x2;
                }, set: function set(x2) {
                    this._x2 = x2;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothRel.prototype, "y2", { get: function get() {
                    return this._y2;
                }, set: function set(y2) {
                    this._y2 = y2;this._segmentChanged();
                }, enumerable: true });

            window.SVGPathSegCurvetoQuadraticSmoothAbs = function (owningPathSegList, x, y) {
                window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS, "T", owningPathSegList);
                this._x = x;
                this._y = y;
            };
            window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype = Object.create(window.SVGPathSeg.prototype);
            window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype.toString = function () {
                return "[object SVGPathSegCurvetoQuadraticSmoothAbs]";
            };
            window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype._asPathString = function () {
                return this.pathSegTypeAsLetter + " " + this._x + " " + this._y;
            };
            window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype.clone = function () {
                return new window.SVGPathSegCurvetoQuadraticSmoothAbs(undefined, this._x, this._y);
            };
            Object.defineProperty(window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype, "x", { get: function get() {
                    return this._x;
                }, set: function set(x) {
                    this._x = x;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype, "y", { get: function get() {
                    return this._y;
                }, set: function set(y) {
                    this._y = y;this._segmentChanged();
                }, enumerable: true });

            window.SVGPathSegCurvetoQuadraticSmoothRel = function (owningPathSegList, x, y) {
                window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL, "t", owningPathSegList);
                this._x = x;
                this._y = y;
            };
            window.SVGPathSegCurvetoQuadraticSmoothRel.prototype = Object.create(window.SVGPathSeg.prototype);
            window.SVGPathSegCurvetoQuadraticSmoothRel.prototype.toString = function () {
                return "[object SVGPathSegCurvetoQuadraticSmoothRel]";
            };
            window.SVGPathSegCurvetoQuadraticSmoothRel.prototype._asPathString = function () {
                return this.pathSegTypeAsLetter + " " + this._x + " " + this._y;
            };
            window.SVGPathSegCurvetoQuadraticSmoothRel.prototype.clone = function () {
                return new window.SVGPathSegCurvetoQuadraticSmoothRel(undefined, this._x, this._y);
            };
            Object.defineProperty(window.SVGPathSegCurvetoQuadraticSmoothRel.prototype, "x", { get: function get() {
                    return this._x;
                }, set: function set(x) {
                    this._x = x;this._segmentChanged();
                }, enumerable: true });
            Object.defineProperty(window.SVGPathSegCurvetoQuadraticSmoothRel.prototype, "y", { get: function get() {
                    return this._y;
                }, set: function set(y) {
                    this._y = y;this._segmentChanged();
                }, enumerable: true });

            // Add createSVGPathSeg* functions to window.SVGPathElement.
            // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-Interfacewindow.SVGPathElement.
            window.SVGPathElement.prototype.createSVGPathSegClosePath = function () {
                return new window.SVGPathSegClosePath(undefined);
            };
            window.SVGPathElement.prototype.createSVGPathSegMovetoAbs = function (x, y) {
                return new window.SVGPathSegMovetoAbs(undefined, x, y);
            };
            window.SVGPathElement.prototype.createSVGPathSegMovetoRel = function (x, y) {
                return new window.SVGPathSegMovetoRel(undefined, x, y);
            };
            window.SVGPathElement.prototype.createSVGPathSegLinetoAbs = function (x, y) {
                return new window.SVGPathSegLinetoAbs(undefined, x, y);
            };
            window.SVGPathElement.prototype.createSVGPathSegLinetoRel = function (x, y) {
                return new window.SVGPathSegLinetoRel(undefined, x, y);
            };
            window.SVGPathElement.prototype.createSVGPathSegCurvetoCubicAbs = function (x, y, x1, y1, x2, y2) {
                return new window.SVGPathSegCurvetoCubicAbs(undefined, x, y, x1, y1, x2, y2);
            };
            window.SVGPathElement.prototype.createSVGPathSegCurvetoCubicRel = function (x, y, x1, y1, x2, y2) {
                return new window.SVGPathSegCurvetoCubicRel(undefined, x, y, x1, y1, x2, y2);
            };
            window.SVGPathElement.prototype.createSVGPathSegCurvetoQuadraticAbs = function (x, y, x1, y1) {
                return new window.SVGPathSegCurvetoQuadraticAbs(undefined, x, y, x1, y1);
            };
            window.SVGPathElement.prototype.createSVGPathSegCurvetoQuadraticRel = function (x, y, x1, y1) {
                return new window.SVGPathSegCurvetoQuadraticRel(undefined, x, y, x1, y1);
            };
            window.SVGPathElement.prototype.createSVGPathSegArcAbs = function (x, y, r1, r2, angle, largeArcFlag, sweepFlag) {
                return new window.SVGPathSegArcAbs(undefined, x, y, r1, r2, angle, largeArcFlag, sweepFlag);
            };
            window.SVGPathElement.prototype.createSVGPathSegArcRel = function (x, y, r1, r2, angle, largeArcFlag, sweepFlag) {
                return new window.SVGPathSegArcRel(undefined, x, y, r1, r2, angle, largeArcFlag, sweepFlag);
            };
            window.SVGPathElement.prototype.createSVGPathSegLinetoHorizontalAbs = function (x) {
                return new window.SVGPathSegLinetoHorizontalAbs(undefined, x);
            };
            window.SVGPathElement.prototype.createSVGPathSegLinetoHorizontalRel = function (x) {
                return new window.SVGPathSegLinetoHorizontalRel(undefined, x);
            };
            window.SVGPathElement.prototype.createSVGPathSegLinetoVerticalAbs = function (y) {
                return new window.SVGPathSegLinetoVerticalAbs(undefined, y);
            };
            window.SVGPathElement.prototype.createSVGPathSegLinetoVerticalRel = function (y) {
                return new window.SVGPathSegLinetoVerticalRel(undefined, y);
            };
            window.SVGPathElement.prototype.createSVGPathSegCurvetoCubicSmoothAbs = function (x, y, x2, y2) {
                return new window.SVGPathSegCurvetoCubicSmoothAbs(undefined, x, y, x2, y2);
            };
            window.SVGPathElement.prototype.createSVGPathSegCurvetoCubicSmoothRel = function (x, y, x2, y2) {
                return new window.SVGPathSegCurvetoCubicSmoothRel(undefined, x, y, x2, y2);
            };
            window.SVGPathElement.prototype.createSVGPathSegCurvetoQuadraticSmoothAbs = function (x, y) {
                return new window.SVGPathSegCurvetoQuadraticSmoothAbs(undefined, x, y);
            };
            window.SVGPathElement.prototype.createSVGPathSegCurvetoQuadraticSmoothRel = function (x, y) {
                return new window.SVGPathSegCurvetoQuadraticSmoothRel(undefined, x, y);
            };

            if (!("getPathSegAtLength" in window.SVGPathElement.prototype)) {
                // Add getPathSegAtLength to SVGPathElement.
                // Spec: https://www.w3.org/TR/SVG11/single-page.html#paths-__svg__SVGPathElement__getPathSegAtLength
                // This polyfill requires SVGPathElement.getTotalLength to implement the distance-along-a-path algorithm.
                window.SVGPathElement.prototype.getPathSegAtLength = function (distance) {
                    if (distance === undefined || !isFinite(distance)) throw "Invalid arguments.";

                    var measurementElement = document.createElementNS("http://www.w3.org/2000/svg", "path");
                    measurementElement.setAttribute("d", this.getAttribute("d"));
                    var lastPathSegment = measurementElement.pathSegList.numberOfItems - 1;

                    // If the path is empty, return 0.
                    if (lastPathSegment <= 0) return 0;

                    do {
                        measurementElement.pathSegList.removeItem(lastPathSegment);
                        if (distance > measurementElement.getTotalLength()) break;
                        lastPathSegment--;
                    } while (lastPathSegment > 0);
                    return lastPathSegment;
                };
            }
        }

        if (!("SVGPathSegList" in window)) {
            // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-InterfaceSVGPathSegList
            window.SVGPathSegList = function (pathElement) {
                this._pathElement = pathElement;
                this._list = this._parsePath(this._pathElement.getAttribute("d"));

                // Use a MutationObserver to catch changes to the path's "d" attribute.
                this._mutationObserverConfig = { "attributes": true, "attributeFilter": ["d"] };
                this._pathElementMutationObserver = new MutationObserver(this._updateListFromPathMutations.bind(this));
                this._pathElementMutationObserver.observe(this._pathElement, this._mutationObserverConfig);
            };

            window.SVGPathSegList.prototype.classname = "SVGPathSegList";

            Object.defineProperty(window.SVGPathSegList.prototype, "numberOfItems", {
                get: function get() {
                    this._checkPathSynchronizedToList();
                    return this._list.length;
                },
                enumerable: true
            });

            // Add the pathSegList accessors to window.SVGPathElement.
            // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-InterfaceSVGAnimatedPathData
            Object.defineProperty(window.SVGPathElement.prototype, "pathSegList", {
                get: function get() {
                    if (!this._pathSegList) this._pathSegList = new window.SVGPathSegList(this);
                    return this._pathSegList;
                },
                enumerable: true
            });
            // FIXME: The following are not implemented and simply return window.SVGPathElement.pathSegList.
            Object.defineProperty(window.SVGPathElement.prototype, "normalizedPathSegList", { get: function get() {
                    return this.pathSegList;
                }, enumerable: true });
            Object.defineProperty(window.SVGPathElement.prototype, "animatedPathSegList", { get: function get() {
                    return this.pathSegList;
                }, enumerable: true });
            Object.defineProperty(window.SVGPathElement.prototype, "animatedNormalizedPathSegList", { get: function get() {
                    return this.pathSegList;
                }, enumerable: true });

            // Process any pending mutations to the path element and update the list as needed.
            // This should be the first call of all public functions and is needed because
            // MutationObservers are not synchronous so we can have pending asynchronous mutations.
            window.SVGPathSegList.prototype._checkPathSynchronizedToList = function () {
                this._updateListFromPathMutations(this._pathElementMutationObserver.takeRecords());
            };

            window.SVGPathSegList.prototype._updateListFromPathMutations = function (mutationRecords) {
                if (!this._pathElement) return;
                var hasPathMutations = false;
                mutationRecords.forEach(function (record) {
                    if (record.attributeName == "d") hasPathMutations = true;
                });
                if (hasPathMutations) this._list = this._parsePath(this._pathElement.getAttribute("d"));
            };

            // Serialize the list and update the path's 'd' attribute.
            window.SVGPathSegList.prototype._writeListToPath = function () {
                this._pathElementMutationObserver.disconnect();
                this._pathElement.setAttribute("d", window.SVGPathSegList._pathSegArrayAsString(this._list));
                this._pathElementMutationObserver.observe(this._pathElement, this._mutationObserverConfig);
            };

            // When a path segment changes the list needs to be synchronized back to the path element.
            window.SVGPathSegList.prototype.segmentChanged = function (pathSeg) {
                this._writeListToPath();
            };

            window.SVGPathSegList.prototype.clear = function () {
                this._checkPathSynchronizedToList();

                this._list.forEach(function (pathSeg) {
                    pathSeg._owningPathSegList = null;
                });
                this._list = [];
                this._writeListToPath();
            };

            window.SVGPathSegList.prototype.initialize = function (newItem) {
                this._checkPathSynchronizedToList();

                this._list = [newItem];
                newItem._owningPathSegList = this;
                this._writeListToPath();
                return newItem;
            };

            window.SVGPathSegList.prototype._checkValidIndex = function (index) {
                if (isNaN(index) || index < 0 || index >= this.numberOfItems) throw "INDEX_SIZE_ERR";
            };

            window.SVGPathSegList.prototype.getItem = function (index) {
                this._checkPathSynchronizedToList();

                this._checkValidIndex(index);
                return this._list[index];
            };

            window.SVGPathSegList.prototype.insertItemBefore = function (newItem, index) {
                this._checkPathSynchronizedToList();

                // Spec: If the index is greater than or equal to numberOfItems, then the new item is appended to the end of the list.
                if (index > this.numberOfItems) index = this.numberOfItems;
                if (newItem._owningPathSegList) {
                    // SVG2 spec says to make a copy.
                    newItem = newItem.clone();
                }
                this._list.splice(index, 0, newItem);
                newItem._owningPathSegList = this;
                this._writeListToPath();
                return newItem;
            };

            window.SVGPathSegList.prototype.replaceItem = function (newItem, index) {
                this._checkPathSynchronizedToList();

                if (newItem._owningPathSegList) {
                    // SVG2 spec says to make a copy.
                    newItem = newItem.clone();
                }
                this._checkValidIndex(index);
                this._list[index] = newItem;
                newItem._owningPathSegList = this;
                this._writeListToPath();
                return newItem;
            };

            window.SVGPathSegList.prototype.removeItem = function (index) {
                this._checkPathSynchronizedToList();

                this._checkValidIndex(index);
                var item = this._list[index];
                this._list.splice(index, 1);
                this._writeListToPath();
                return item;
            };

            window.SVGPathSegList.prototype.appendItem = function (newItem) {
                this._checkPathSynchronizedToList();

                if (newItem._owningPathSegList) {
                    // SVG2 spec says to make a copy.
                    newItem = newItem.clone();
                }
                this._list.push(newItem);
                newItem._owningPathSegList = this;
                // TODO: Optimize this to just append to the existing attribute.
                this._writeListToPath();
                return newItem;
            };

            window.SVGPathSegList._pathSegArrayAsString = function (pathSegArray) {
                var string = "";
                var first = true;
                pathSegArray.forEach(function (pathSeg) {
                    if (first) {
                        first = false;
                        string += pathSeg._asPathString();
                    } else {
                        string += " " + pathSeg._asPathString();
                    }
                });
                return string;
            };

            // This closely follows SVGPathParser::parsePath from Source/core/svg/SVGPathParser.cpp.
            window.SVGPathSegList.prototype._parsePath = function (string) {
                if (!string || string.length == 0) return [];

                var owningPathSegList = this;

                var Builder = function Builder() {
                    this.pathSegList = [];
                };

                Builder.prototype.appendSegment = function (pathSeg) {
                    this.pathSegList.push(pathSeg);
                };

                var Source = function Source(string) {
                    this._string = string;
                    this._currentIndex = 0;
                    this._endIndex = this._string.length;
                    this._previousCommand = window.SVGPathSeg.PATHSEG_UNKNOWN;

                    this._skipOptionalSpaces();
                };

                Source.prototype._isCurrentSpace = function () {
                    var character = this._string[this._currentIndex];
                    return character <= " " && (character == " " || character == "\n" || character == "\t" || character == "\r" || character == "\f");
                };

                Source.prototype._skipOptionalSpaces = function () {
                    while (this._currentIndex < this._endIndex && this._isCurrentSpace()) {
                        this._currentIndex++;
                    }return this._currentIndex < this._endIndex;
                };

                Source.prototype._skipOptionalSpacesOrDelimiter = function () {
                    if (this._currentIndex < this._endIndex && !this._isCurrentSpace() && this._string.charAt(this._currentIndex) != ",") return false;
                    if (this._skipOptionalSpaces()) {
                        if (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) == ",") {
                            this._currentIndex++;
                            this._skipOptionalSpaces();
                        }
                    }
                    return this._currentIndex < this._endIndex;
                };

                Source.prototype.hasMoreData = function () {
                    return this._currentIndex < this._endIndex;
                };

                Source.prototype.peekSegmentType = function () {
                    var lookahead = this._string[this._currentIndex];
                    return this._pathSegTypeFromChar(lookahead);
                };

                Source.prototype._pathSegTypeFromChar = function (lookahead) {
                    switch (lookahead) {
                        case "Z":
                        case "z":
                            return window.SVGPathSeg.PATHSEG_CLOSEPATH;
                        case "M":
                            return window.SVGPathSeg.PATHSEG_MOVETO_ABS;
                        case "m":
                            return window.SVGPathSeg.PATHSEG_MOVETO_REL;
                        case "L":
                            return window.SVGPathSeg.PATHSEG_LINETO_ABS;
                        case "l":
                            return window.SVGPathSeg.PATHSEG_LINETO_REL;
                        case "C":
                            return window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS;
                        case "c":
                            return window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_REL;
                        case "Q":
                            return window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_ABS;
                        case "q":
                            return window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_REL;
                        case "A":
                            return window.SVGPathSeg.PATHSEG_ARC_ABS;
                        case "a":
                            return window.SVGPathSeg.PATHSEG_ARC_REL;
                        case "H":
                            return window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_ABS;
                        case "h":
                            return window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_REL;
                        case "V":
                            return window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_ABS;
                        case "v":
                            return window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_REL;
                        case "S":
                            return window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_ABS;
                        case "s":
                            return window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_REL;
                        case "T":
                            return window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS;
                        case "t":
                            return window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL;
                        default:
                            return window.SVGPathSeg.PATHSEG_UNKNOWN;
                    }
                };

                Source.prototype._nextCommandHelper = function (lookahead, previousCommand) {
                    // Check for remaining coordinates in the current command.
                    if ((lookahead == "+" || lookahead == "-" || lookahead == "." || lookahead >= "0" && lookahead <= "9") && previousCommand != window.SVGPathSeg.PATHSEG_CLOSEPATH) {
                        if (previousCommand == window.SVGPathSeg.PATHSEG_MOVETO_ABS) return window.SVGPathSeg.PATHSEG_LINETO_ABS;
                        if (previousCommand == window.SVGPathSeg.PATHSEG_MOVETO_REL) return window.SVGPathSeg.PATHSEG_LINETO_REL;
                        return previousCommand;
                    }
                    return window.SVGPathSeg.PATHSEG_UNKNOWN;
                };

                Source.prototype.initialCommandIsMoveTo = function () {
                    // If the path is empty it is still valid, so return true.
                    if (!this.hasMoreData()) return true;
                    var command = this.peekSegmentType();
                    // Path must start with moveTo.
                    return command == window.SVGPathSeg.PATHSEG_MOVETO_ABS || command == window.SVGPathSeg.PATHSEG_MOVETO_REL;
                };

                // Parse a number from an SVG path. This very closely follows genericParseNumber(...) from Source/core/svg/SVGParserUtilities.cpp.
                // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-PathDataBNF
                Source.prototype._parseNumber = function () {
                    var exponent = 0;
                    var integer = 0;
                    var frac = 1;
                    var decimal = 0;
                    var sign = 1;
                    var expsign = 1;

                    var startIndex = this._currentIndex;

                    this._skipOptionalSpaces();

                    // Read the sign.
                    if (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) == "+") this._currentIndex++;else if (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) == "-") {
                        this._currentIndex++;
                        sign = -1;
                    }

                    if (this._currentIndex == this._endIndex || (this._string.charAt(this._currentIndex) < "0" || this._string.charAt(this._currentIndex) > "9") && this._string.charAt(this._currentIndex) != ".")
                        // The first character of a number must be one of [0-9+-.].
                        return undefined;

                    // Read the integer part, build right-to-left.
                    var startIntPartIndex = this._currentIndex;
                    while (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) >= "0" && this._string.charAt(this._currentIndex) <= "9") {
                        this._currentIndex++;
                    } // Advance to first non-digit.

                    if (this._currentIndex != startIntPartIndex) {
                        var scanIntPartIndex = this._currentIndex - 1;
                        var multiplier = 1;
                        while (scanIntPartIndex >= startIntPartIndex) {
                            integer += multiplier * (this._string.charAt(scanIntPartIndex--) - "0");
                            multiplier *= 10;
                        }
                    }

                    // Read the decimals.
                    if (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) == ".") {
                        this._currentIndex++;

                        // There must be a least one digit following the .
                        if (this._currentIndex >= this._endIndex || this._string.charAt(this._currentIndex) < "0" || this._string.charAt(this._currentIndex) > "9") return undefined;
                        while (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) >= "0" && this._string.charAt(this._currentIndex) <= "9") {
                            frac *= 10;
                            decimal += (this._string.charAt(this._currentIndex) - "0") / frac;
                            this._currentIndex += 1;
                        }
                    }

                    // Read the exponent part.
                    if (this._currentIndex != startIndex && this._currentIndex + 1 < this._endIndex && (this._string.charAt(this._currentIndex) == "e" || this._string.charAt(this._currentIndex) == "E") && this._string.charAt(this._currentIndex + 1) != "x" && this._string.charAt(this._currentIndex + 1) != "m") {
                        this._currentIndex++;

                        // Read the sign of the exponent.
                        if (this._string.charAt(this._currentIndex) == "+") {
                            this._currentIndex++;
                        } else if (this._string.charAt(this._currentIndex) == "-") {
                            this._currentIndex++;
                            expsign = -1;
                        }

                        // There must be an exponent.
                        if (this._currentIndex >= this._endIndex || this._string.charAt(this._currentIndex) < "0" || this._string.charAt(this._currentIndex) > "9") return undefined;

                        while (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) >= "0" && this._string.charAt(this._currentIndex) <= "9") {
                            exponent *= 10;
                            exponent += this._string.charAt(this._currentIndex) - "0";
                            this._currentIndex++;
                        }
                    }

                    var number = integer + decimal;
                    number *= sign;

                    if (exponent) number *= Math.pow(10, expsign * exponent);

                    if (startIndex == this._currentIndex) return undefined;

                    this._skipOptionalSpacesOrDelimiter();

                    return number;
                };

                Source.prototype._parseArcFlag = function () {
                    if (this._currentIndex >= this._endIndex) return undefined;
                    var flag = false;
                    var flagChar = this._string.charAt(this._currentIndex++);
                    if (flagChar == "0") flag = false;else if (flagChar == "1") flag = true;else return undefined;

                    this._skipOptionalSpacesOrDelimiter();
                    return flag;
                };

                Source.prototype.parseSegment = function () {
                    var lookahead = this._string[this._currentIndex];
                    var command = this._pathSegTypeFromChar(lookahead);
                    if (command == window.SVGPathSeg.PATHSEG_UNKNOWN) {
                        // Possibly an implicit command. Not allowed if this is the first command.
                        if (this._previousCommand == window.SVGPathSeg.PATHSEG_UNKNOWN) return null;
                        command = this._nextCommandHelper(lookahead, this._previousCommand);
                        if (command == window.SVGPathSeg.PATHSEG_UNKNOWN) return null;
                    } else {
                        this._currentIndex++;
                    }

                    this._previousCommand = command;

                    switch (command) {
                        case window.SVGPathSeg.PATHSEG_MOVETO_REL:
                            return new window.SVGPathSegMovetoRel(owningPathSegList, this._parseNumber(), this._parseNumber());
                        case window.SVGPathSeg.PATHSEG_MOVETO_ABS:
                            return new window.SVGPathSegMovetoAbs(owningPathSegList, this._parseNumber(), this._parseNumber());
                        case window.SVGPathSeg.PATHSEG_LINETO_REL:
                            return new window.SVGPathSegLinetoRel(owningPathSegList, this._parseNumber(), this._parseNumber());
                        case window.SVGPathSeg.PATHSEG_LINETO_ABS:
                            return new window.SVGPathSegLinetoAbs(owningPathSegList, this._parseNumber(), this._parseNumber());
                        case window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_REL:
                            return new window.SVGPathSegLinetoHorizontalRel(owningPathSegList, this._parseNumber());
                        case window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_ABS:
                            return new window.SVGPathSegLinetoHorizontalAbs(owningPathSegList, this._parseNumber());
                        case window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_REL:
                            return new window.SVGPathSegLinetoVerticalRel(owningPathSegList, this._parseNumber());
                        case window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_ABS:
                            return new window.SVGPathSegLinetoVerticalAbs(owningPathSegList, this._parseNumber());
                        case window.SVGPathSeg.PATHSEG_CLOSEPATH:
                            this._skipOptionalSpaces();
                            return new window.SVGPathSegClosePath(owningPathSegList);
                        case window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_REL:
                            var points = { x1: this._parseNumber(), y1: this._parseNumber(), x2: this._parseNumber(), y2: this._parseNumber(), x: this._parseNumber(), y: this._parseNumber() };
                            return new window.SVGPathSegCurvetoCubicRel(owningPathSegList, points.x, points.y, points.x1, points.y1, points.x2, points.y2);
                        case window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS:
                            var points = { x1: this._parseNumber(), y1: this._parseNumber(), x2: this._parseNumber(), y2: this._parseNumber(), x: this._parseNumber(), y: this._parseNumber() };
                            return new window.SVGPathSegCurvetoCubicAbs(owningPathSegList, points.x, points.y, points.x1, points.y1, points.x2, points.y2);
                        case window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_REL:
                            var points = { x2: this._parseNumber(), y2: this._parseNumber(), x: this._parseNumber(), y: this._parseNumber() };
                            return new window.SVGPathSegCurvetoCubicSmoothRel(owningPathSegList, points.x, points.y, points.x2, points.y2);
                        case window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_ABS:
                            var points = { x2: this._parseNumber(), y2: this._parseNumber(), x: this._parseNumber(), y: this._parseNumber() };
                            return new window.SVGPathSegCurvetoCubicSmoothAbs(owningPathSegList, points.x, points.y, points.x2, points.y2);
                        case window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_REL:
                            var points = { x1: this._parseNumber(), y1: this._parseNumber(), x: this._parseNumber(), y: this._parseNumber() };
                            return new window.SVGPathSegCurvetoQuadraticRel(owningPathSegList, points.x, points.y, points.x1, points.y1);
                        case window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_ABS:
                            var points = { x1: this._parseNumber(), y1: this._parseNumber(), x: this._parseNumber(), y: this._parseNumber() };
                            return new window.SVGPathSegCurvetoQuadraticAbs(owningPathSegList, points.x, points.y, points.x1, points.y1);
                        case window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL:
                            return new window.SVGPathSegCurvetoQuadraticSmoothRel(owningPathSegList, this._parseNumber(), this._parseNumber());
                        case window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS:
                            return new window.SVGPathSegCurvetoQuadraticSmoothAbs(owningPathSegList, this._parseNumber(), this._parseNumber());
                        case window.SVGPathSeg.PATHSEG_ARC_REL:
                            var points = { x1: this._parseNumber(), y1: this._parseNumber(), arcAngle: this._parseNumber(), arcLarge: this._parseArcFlag(), arcSweep: this._parseArcFlag(), x: this._parseNumber(), y: this._parseNumber() };
                            return new window.SVGPathSegArcRel(owningPathSegList, points.x, points.y, points.x1, points.y1, points.arcAngle, points.arcLarge, points.arcSweep);
                        case window.SVGPathSeg.PATHSEG_ARC_ABS:
                            var points = { x1: this._parseNumber(), y1: this._parseNumber(), arcAngle: this._parseNumber(), arcLarge: this._parseArcFlag(), arcSweep: this._parseArcFlag(), x: this._parseNumber(), y: this._parseNumber() };
                            return new window.SVGPathSegArcAbs(owningPathSegList, points.x, points.y, points.x1, points.y1, points.arcAngle, points.arcLarge, points.arcSweep);
                        default:
                            throw "Unknown path seg type.";
                    }
                };

                var builder = new Builder();
                var source = new Source(string);

                if (!source.initialCommandIsMoveTo()) return [];
                while (source.hasMoreData()) {
                    var pathSeg = source.parseSegment();
                    if (!pathSeg) return [];
                    builder.appendSegment(pathSeg);
                }

                return builder.pathSegList;
            };
        }
    })();

    /* jshint ignore:end */

    c3_chart_fn.axis = function () {};
    c3_chart_fn.axis.labels = function (labels) {
        var $$ = this.internal;
        if (arguments.length) {
            Object.keys(labels).forEach(function (axisId) {
                $$.axis.setLabelText(axisId, labels[axisId]);
            });
            $$.axis.updateLabels();
        }
        // TODO: return some values?
    };
    c3_chart_fn.axis.max = function (max) {
        var $$ = this.internal,
            config = $$.config;
        if (arguments.length) {
            if ((typeof max === 'undefined' ? 'undefined' : _typeof(max)) === 'object') {
                if (isValue(max.x)) {
                    config.axis_x_max = max.x;
                }
                if (isValue(max.y)) {
                    config.axis_y_max = max.y;
                }
                if (isValue(max.y2)) {
                    config.axis_y2_max = max.y2;
                }
            } else {
                config.axis_y_max = config.axis_y2_max = max;
            }
            $$.redraw({ withUpdateOrgXDomain: true, withUpdateXDomain: true });
        } else {
            return {
                x: config.axis_x_max,
                y: config.axis_y_max,
                y2: config.axis_y2_max
            };
        }
    };
    c3_chart_fn.axis.min = function (min) {
        var $$ = this.internal,
            config = $$.config;
        if (arguments.length) {
            if ((typeof min === 'undefined' ? 'undefined' : _typeof(min)) === 'object') {
                if (isValue(min.x)) {
                    config.axis_x_min = min.x;
                }
                if (isValue(min.y)) {
                    config.axis_y_min = min.y;
                }
                if (isValue(min.y2)) {
                    config.axis_y2_min = min.y2;
                }
            } else {
                config.axis_y_min = config.axis_y2_min = min;
            }
            $$.redraw({ withUpdateOrgXDomain: true, withUpdateXDomain: true });
        } else {
            return {
                x: config.axis_x_min,
                y: config.axis_y_min,
                y2: config.axis_y2_min
            };
        }
    };
    c3_chart_fn.axis.range = function (range) {
        if (arguments.length) {
            if (isDefined(range.max)) {
                this.axis.max(range.max);
            }
            if (isDefined(range.min)) {
                this.axis.min(range.min);
            }
        } else {
            return {
                max: this.axis.max(),
                min: this.axis.min()
            };
        }
    };

    c3_chart_fn.category = function (i, category) {
        var $$ = this.internal,
            config = $$.config;
        if (arguments.length > 1) {
            config.axis_x_categories[i] = category;
            $$.redraw();
        }
        return config.axis_x_categories[i];
    };
    c3_chart_fn.categories = function (categories) {
        var $$ = this.internal,
            config = $$.config;
        if (!arguments.length) {
            return config.axis_x_categories;
        }
        config.axis_x_categories = categories;
        $$.redraw();
        return config.axis_x_categories;
    };

    c3_chart_fn.resize = function (size) {
        var $$ = this.internal,
            config = $$.config;
        config.size_width = size ? size.width : null;
        config.size_height = size ? size.height : null;
        this.flush();
    };

    c3_chart_fn.flush = function () {
        var $$ = this.internal;
        $$.updateAndRedraw({ withLegend: true, withTransition: false, withTransitionForTransform: false });
    };

    c3_chart_fn.destroy = function () {
        var $$ = this.internal;

        window.clearInterval($$.intervalForObserveInserted);

        if ($$.resizeTimeout !== undefined) {
            window.clearTimeout($$.resizeTimeout);
        }

        if (window.detachEvent) {
            window.detachEvent('onresize', $$.resizeIfElementDisplayed);
        } else if (window.removeEventListener) {
            window.removeEventListener('resize', $$.resizeIfElementDisplayed);
        } else {
            var wrapper = window.onresize;
            // check if no one else removed our wrapper and remove our resizeFunction from it
            if (wrapper && wrapper.add && wrapper.remove) {
                wrapper.remove($$.resizeFunction);
            }
        }

        // remove the inner resize functions
        $$.resizeFunction.remove();

        $$.selectChart.classed('c3', false).html("");

        // MEMO: this is needed because the reference of some elements will not be released, then memory leak will happen.
        Object.keys($$).forEach(function (key) {
            $$[key] = null;
        });

        return null;
    };

    // TODO: fix
    c3_chart_fn.color = function (id) {
        var $$ = this.internal;
        return $$.color(id); // more patterns
    };

    c3_chart_fn.data = function (targetIds) {
        var targets = this.internal.data.targets;
        return typeof targetIds === 'undefined' ? targets : targets.filter(function (t) {
            return [].concat(targetIds).indexOf(t.id) >= 0;
        });
    };
    c3_chart_fn.data.shown = function (targetIds) {
        return this.internal.filterTargetsToShow(this.data(targetIds));
    };
    c3_chart_fn.data.values = function (targetId) {
        var targets,
            values = null;
        if (targetId) {
            targets = this.data(targetId);
            values = targets[0] ? targets[0].values.map(function (d) {
                return d.value;
            }) : null;
        }
        return values;
    };
    c3_chart_fn.data.names = function (names) {
        this.internal.clearLegendItemTextBoxCache();
        return this.internal.updateDataAttributes('names', names);
    };
    c3_chart_fn.data.colors = function (colors) {
        return this.internal.updateDataAttributes('colors', colors);
    };
    c3_chart_fn.data.axes = function (axes) {
        return this.internal.updateDataAttributes('axes', axes);
    };

    c3_chart_fn.flow = function (args) {
        var $$ = this.internal,
            targets,
            data,
            notfoundIds = [],
            orgDataCount = $$.getMaxDataCount(),
            dataCount,
            domain,
            baseTarget,
            baseValue,
            length = 0,
            tail = 0,
            diff,
            to;

        if (args.json) {
            data = $$.convertJsonToData(args.json, args.keys);
        } else if (args.rows) {
            data = $$.convertRowsToData(args.rows);
        } else if (args.columns) {
            data = $$.convertColumnsToData(args.columns);
        } else {
            return;
        }
        targets = $$.convertDataToTargets(data, true);

        // Update/Add data
        $$.data.targets.forEach(function (t) {
            var found = false,
                i,
                j;
            for (i = 0; i < targets.length; i++) {
                if (t.id === targets[i].id) {
                    found = true;

                    if (t.values[t.values.length - 1]) {
                        tail = t.values[t.values.length - 1].index + 1;
                    }
                    length = targets[i].values.length;

                    for (j = 0; j < length; j++) {
                        targets[i].values[j].index = tail + j;
                        if (!$$.isTimeSeries()) {
                            targets[i].values[j].x = tail + j;
                        }
                    }
                    t.values = t.values.concat(targets[i].values);

                    targets.splice(i, 1);
                    break;
                }
            }
            if (!found) {
                notfoundIds.push(t.id);
            }
        });

        // Append null for not found targets
        $$.data.targets.forEach(function (t) {
            var i, j;
            for (i = 0; i < notfoundIds.length; i++) {
                if (t.id === notfoundIds[i]) {
                    tail = t.values[t.values.length - 1].index + 1;
                    for (j = 0; j < length; j++) {
                        t.values.push({
                            id: t.id,
                            index: tail + j,
                            x: $$.isTimeSeries() ? $$.getOtherTargetX(tail + j) : tail + j,
                            value: null
                        });
                    }
                }
            }
        });

        // Generate null values for new target
        if ($$.data.targets.length) {
            targets.forEach(function (t) {
                var i,
                    missing = [];
                for (i = $$.data.targets[0].values[0].index; i < tail; i++) {
                    missing.push({
                        id: t.id,
                        index: i,
                        x: $$.isTimeSeries() ? $$.getOtherTargetX(i) : i,
                        value: null
                    });
                }
                t.values.forEach(function (v) {
                    v.index += tail;
                    if (!$$.isTimeSeries()) {
                        v.x += tail;
                    }
                });
                t.values = missing.concat(t.values);
            });
        }
        $$.data.targets = $$.data.targets.concat(targets); // add remained

        // check data count because behavior needs to change when it's only one
        dataCount = $$.getMaxDataCount();
        baseTarget = $$.data.targets[0];
        baseValue = baseTarget.values[0];

        // Update length to flow if needed
        if (isDefined(args.to)) {
            length = 0;
            to = $$.isTimeSeries() ? $$.parseDate(args.to) : args.to;
            baseTarget.values.forEach(function (v) {
                if (v.x < to) {
                    length++;
                }
            });
        } else if (isDefined(args.length)) {
            length = args.length;
        }

        // If only one data, update the domain to flow from left edge of the chart
        if (!orgDataCount) {
            if ($$.isTimeSeries()) {
                if (baseTarget.values.length > 1) {
                    diff = baseTarget.values[baseTarget.values.length - 1].x - baseValue.x;
                } else {
                    diff = baseValue.x - $$.getXDomain($$.data.targets)[0];
                }
            } else {
                diff = 1;
            }
            domain = [baseValue.x - diff, baseValue.x];
            $$.updateXDomain(null, true, true, false, domain);
        } else if (orgDataCount === 1) {
            if ($$.isTimeSeries()) {
                diff = (baseTarget.values[baseTarget.values.length - 1].x - baseValue.x) / 2;
                domain = [new Date(+baseValue.x - diff), new Date(+baseValue.x + diff)];
                $$.updateXDomain(null, true, true, false, domain);
            }
        }

        // Set targets
        $$.updateTargets($$.data.targets);

        // Redraw with new targets
        $$.redraw({
            flow: {
                index: baseValue.index,
                length: length,
                duration: isValue(args.duration) ? args.duration : $$.config.transition_duration,
                done: args.done,
                orgDataCount: orgDataCount
            },
            withLegend: true,
            withTransition: orgDataCount > 1,
            withTrimXDomain: false,
            withUpdateXAxis: true
        });
    };

    c3_chart_internal_fn.generateFlow = function (args) {
        var $$ = this,
            config = $$.config,
            d3 = $$.d3;

        return function () {
            var targets = args.targets,
                flow = args.flow,
                drawBar = args.drawBar,
                drawLine = args.drawLine,
                drawArea = args.drawArea,
                cx = args.cx,
                cy = args.cy,
                xv = args.xv,
                xForText = args.xForText,
                yForText = args.yForText,
                duration = args.duration;

            var translateX,
                scaleX = 1,
                transform,
                flowIndex = flow.index,
                flowLength = flow.length,
                flowStart = $$.getValueOnIndex($$.data.targets[0].values, flowIndex),
                flowEnd = $$.getValueOnIndex($$.data.targets[0].values, flowIndex + flowLength),
                orgDomain = $$.x.domain(),
                domain,
                durationForFlow = flow.duration || duration,
                done = flow.done || function () {},
                wait = $$.generateWait();

            var xgrid, xgridLines, mainRegion, mainText, mainBar, mainLine, mainArea, mainCircle;

            // set flag
            $$.flowing = true;

            // remove head data after rendered
            $$.data.targets.forEach(function (d) {
                d.values.splice(0, flowLength);
            });

            // update x domain to generate axis elements for flow
            domain = $$.updateXDomain(targets, true, true);
            // update elements related to x scale
            if ($$.updateXGrid) {
                $$.updateXGrid(true);
            }

            xgrid = $$.xgrid || d3.selectAll([]); // xgrid needs to be obtained after updateXGrid
            xgridLines = $$.xgridLines || d3.selectAll([]);
            mainRegion = $$.mainRegion || d3.selectAll([]);
            mainText = $$.mainText || d3.selectAll([]);
            mainBar = $$.mainBar || d3.selectAll([]);
            mainLine = $$.mainLine || d3.selectAll([]);
            mainArea = $$.mainArea || d3.selectAll([]);
            mainCircle = $$.mainCircle || d3.selectAll([]);

            // generate transform to flow
            if (!flow.orgDataCount) {
                // if empty
                if ($$.data.targets[0].values.length !== 1) {
                    translateX = $$.x(orgDomain[0]) - $$.x(domain[0]);
                } else {
                    if ($$.isTimeSeries()) {
                        flowStart = $$.getValueOnIndex($$.data.targets[0].values, 0);
                        flowEnd = $$.getValueOnIndex($$.data.targets[0].values, $$.data.targets[0].values.length - 1);
                        translateX = $$.x(flowStart.x) - $$.x(flowEnd.x);
                    } else {
                        translateX = diffDomain(domain) / 2;
                    }
                }
            } else if (flow.orgDataCount === 1 || (flowStart && flowStart.x) === (flowEnd && flowEnd.x)) {
                translateX = $$.x(orgDomain[0]) - $$.x(domain[0]);
            } else {
                if ($$.isTimeSeries()) {
                    translateX = $$.x(orgDomain[0]) - $$.x(domain[0]);
                } else {
                    translateX = $$.x(flowStart.x) - $$.x(flowEnd.x);
                }
            }
            scaleX = diffDomain(orgDomain) / diffDomain(domain);
            transform = 'translate(' + translateX + ',0) scale(' + scaleX + ',1)';

            $$.hideXGridFocus();

            var flowTransition = d3.transition().ease(d3.easeLinear).duration(durationForFlow);
            wait.add($$.xAxis($$.axes.x, flowTransition));
            wait.add(mainBar.transition(flowTransition).attr('transform', transform));
            wait.add(mainLine.transition(flowTransition).attr('transform', transform));
            wait.add(mainArea.transition(flowTransition).attr('transform', transform));
            wait.add(mainCircle.transition(flowTransition).attr('transform', transform));
            wait.add(mainText.transition(flowTransition).attr('transform', transform));
            wait.add(mainRegion.filter($$.isRegionOnX).transition(flowTransition).attr('transform', transform));
            wait.add(xgrid.transition(flowTransition).attr('transform', transform));
            wait.add(xgridLines.transition(flowTransition).attr('transform', transform));
            wait(function () {
                var i,
                    shapes = [],
                    texts = [];

                // remove flowed elements
                if (flowLength) {
                    for (i = 0; i < flowLength; i++) {
                        shapes.push('.' + CLASS.shape + '-' + (flowIndex + i));
                        texts.push('.' + CLASS.text + '-' + (flowIndex + i));
                    }
                    $$.svg.selectAll('.' + CLASS.shapes).selectAll(shapes).remove();
                    $$.svg.selectAll('.' + CLASS.texts).selectAll(texts).remove();
                    $$.svg.select('.' + CLASS.xgrid).remove();
                }

                // draw again for removing flowed elements and reverting attr
                xgrid.attr('transform', null).attr('x1', $$.xgridAttr.x1).attr('x2', $$.xgridAttr.x2).attr('y1', $$.xgridAttr.y1).attr('y2', $$.xgridAttr.y2).style("opacity", $$.xgridAttr.opacity);
                xgridLines.attr('transform', null);
                xgridLines.select('line').attr("x1", config.axis_rotated ? 0 : xv).attr("x2", config.axis_rotated ? $$.width : xv);
                xgridLines.select('text').attr("x", config.axis_rotated ? $$.width : 0).attr("y", xv);
                mainBar.attr('transform', null).attr("d", drawBar);
                mainLine.attr('transform', null).attr("d", drawLine);
                mainArea.attr('transform', null).attr("d", drawArea);
                mainCircle.attr('transform', null).attr("cx", cx).attr("cy", cy);
                mainText.attr('transform', null).attr('x', xForText).attr('y', yForText).style('fill-opacity', $$.opacityForText.bind($$));
                mainRegion.attr('transform', null);
                mainRegion.filter($$.isRegionOnX).attr("x", $$.regionX.bind($$)).attr("width", $$.regionWidth.bind($$));

                // callback for end of flow
                done();

                $$.flowing = false;
            });
        };
    };

    c3_chart_fn.focus = function (targetIds) {
        var $$ = this.internal,
            candidates;

        targetIds = $$.mapToTargetIds(targetIds);
        candidates = $$.svg.selectAll($$.selectorTargets(targetIds.filter($$.isTargetToShow, $$))), this.revert();
        this.defocus();
        candidates.classed(CLASS.focused, true).classed(CLASS.defocused, false);
        if ($$.hasArcType()) {
            $$.expandArc(targetIds);
        }
        $$.toggleFocusLegend(targetIds, true);

        $$.focusedTargetIds = targetIds;
        $$.defocusedTargetIds = $$.defocusedTargetIds.filter(function (id) {
            return targetIds.indexOf(id) < 0;
        });
    };

    c3_chart_fn.defocus = function (targetIds) {
        var $$ = this.internal,
            candidates;

        targetIds = $$.mapToTargetIds(targetIds);
        candidates = $$.svg.selectAll($$.selectorTargets(targetIds.filter($$.isTargetToShow, $$))), candidates.classed(CLASS.focused, false).classed(CLASS.defocused, true);
        if ($$.hasArcType()) {
            $$.unexpandArc(targetIds);
        }
        $$.toggleFocusLegend(targetIds, false);

        $$.focusedTargetIds = $$.focusedTargetIds.filter(function (id) {
            return targetIds.indexOf(id) < 0;
        });
        $$.defocusedTargetIds = targetIds;
    };

    c3_chart_fn.revert = function (targetIds) {
        var $$ = this.internal,
            candidates;

        targetIds = $$.mapToTargetIds(targetIds);
        candidates = $$.svg.selectAll($$.selectorTargets(targetIds)); // should be for all targets

        candidates.classed(CLASS.focused, false).classed(CLASS.defocused, false);
        if ($$.hasArcType()) {
            $$.unexpandArc(targetIds);
        }
        if ($$.config.legend_show) {
            $$.showLegend(targetIds.filter($$.isLegendToShow.bind($$)));
            $$.legend.selectAll($$.selectorLegends(targetIds)).filter(function () {
                return $$.d3.select(this).classed(CLASS.legendItemFocused);
            }).classed(CLASS.legendItemFocused, false);
        }

        $$.focusedTargetIds = [];
        $$.defocusedTargetIds = [];
    };

    c3_chart_fn.xgrids = function (grids) {
        var $$ = this.internal,
            config = $$.config;
        if (!grids) {
            return config.grid_x_lines;
        }
        config.grid_x_lines = grids;
        $$.redrawWithoutRescale();
        return config.grid_x_lines;
    };
    c3_chart_fn.xgrids.add = function (grids) {
        var $$ = this.internal;
        return this.xgrids($$.config.grid_x_lines.concat(grids ? grids : []));
    };
    c3_chart_fn.xgrids.remove = function (params) {
        // TODO: multiple
        var $$ = this.internal;
        $$.removeGridLines(params, true);
    };

    c3_chart_fn.ygrids = function (grids) {
        var $$ = this.internal,
            config = $$.config;
        if (!grids) {
            return config.grid_y_lines;
        }
        config.grid_y_lines = grids;
        $$.redrawWithoutRescale();
        return config.grid_y_lines;
    };
    c3_chart_fn.ygrids.add = function (grids) {
        var $$ = this.internal;
        return this.ygrids($$.config.grid_y_lines.concat(grids ? grids : []));
    };
    c3_chart_fn.ygrids.remove = function (params) {
        // TODO: multiple
        var $$ = this.internal;
        $$.removeGridLines(params, false);
    };

    c3_chart_fn.groups = function (groups) {
        var $$ = this.internal,
            config = $$.config;
        if (isUndefined(groups)) {
            return config.data_groups;
        }
        config.data_groups = groups;
        $$.redraw();
        return config.data_groups;
    };

    c3_chart_fn.legend = function () {};
    c3_chart_fn.legend.show = function (targetIds) {
        var $$ = this.internal;
        $$.showLegend($$.mapToTargetIds(targetIds));
        $$.updateAndRedraw({ withLegend: true });
    };
    c3_chart_fn.legend.hide = function (targetIds) {
        var $$ = this.internal;
        $$.hideLegend($$.mapToTargetIds(targetIds));
        $$.updateAndRedraw({ withLegend: true });
    };

    c3_chart_fn.load = function (args) {
        var $$ = this.internal,
            config = $$.config;
        // update xs if specified
        if (args.xs) {
            $$.addXs(args.xs);
        }
        // update names if exists
        if ('names' in args) {
            c3_chart_fn.data.names.bind(this)(args.names);
        }
        // update classes if exists
        if ('classes' in args) {
            Object.keys(args.classes).forEach(function (id) {
                config.data_classes[id] = args.classes[id];
            });
        }
        // update categories if exists
        if ('categories' in args && $$.isCategorized()) {
            config.axis_x_categories = args.categories;
        }
        // update axes if exists
        if ('axes' in args) {
            Object.keys(args.axes).forEach(function (id) {
                config.data_axes[id] = args.axes[id];
            });
        }
        // update colors if exists
        if ('colors' in args) {
            Object.keys(args.colors).forEach(function (id) {
                config.data_colors[id] = args.colors[id];
            });
        }
        // use cache if exists
        if ('cacheIds' in args && $$.hasCaches(args.cacheIds)) {
            $$.load($$.getCaches(args.cacheIds), args.done);
            return;
        }
        // unload if needed
        if ('unload' in args) {
            // TODO: do not unload if target will load (included in url/rows/columns)
            $$.unload($$.mapToTargetIds(typeof args.unload === 'boolean' && args.unload ? null : args.unload), function () {
                $$.loadFromArgs(args);
            });
        } else {
            $$.loadFromArgs(args);
        }
    };

    c3_chart_fn.unload = function (args) {
        var $$ = this.internal;
        args = args || {};
        if (args instanceof Array) {
            args = { ids: args };
        } else if (typeof args === 'string') {
            args = { ids: [args] };
        }
        $$.unload($$.mapToTargetIds(args.ids), function () {
            $$.redraw({ withUpdateOrgXDomain: true, withUpdateXDomain: true, withLegend: true });
            if (args.done) {
                args.done();
            }
        });
    };

    c3_chart_fn.regions = function (regions) {
        var $$ = this.internal,
            config = $$.config;
        if (!regions) {
            return config.regions;
        }
        config.regions = regions;
        $$.redrawWithoutRescale();
        return config.regions;
    };
    c3_chart_fn.regions.add = function (regions) {
        var $$ = this.internal,
            config = $$.config;
        if (!regions) {
            return config.regions;
        }
        config.regions = config.regions.concat(regions);
        $$.redrawWithoutRescale();
        return config.regions;
    };
    c3_chart_fn.regions.remove = function (options) {
        var $$ = this.internal,
            config = $$.config,
            duration,
            classes,
            regions;

        options = options || {};
        duration = $$.getOption(options, "duration", config.transition_duration);
        classes = $$.getOption(options, "classes", [CLASS.region]);

        regions = $$.main.select('.' + CLASS.regions).selectAll(classes.map(function (c) {
            return '.' + c;
        }));
        (duration ? regions.transition().duration(duration) : regions).style('opacity', 0).remove();

        config.regions = config.regions.filter(function (region) {
            var found = false;
            if (!region['class']) {
                return true;
            }
            region['class'].split(' ').forEach(function (c) {
                if (classes.indexOf(c) >= 0) {
                    found = true;
                }
            });
            return !found;
        });

        return config.regions;
    };

    c3_chart_fn.selected = function (targetId) {
        var $$ = this.internal,
            d3 = $$.d3;
        return d3.merge($$.main.selectAll('.' + CLASS.shapes + $$.getTargetSelectorSuffix(targetId)).selectAll('.' + CLASS.shape).filter(function () {
            return d3.select(this).classed(CLASS.SELECTED);
        }).map(function (d) {
            return d.map(function (d) {
                var data = d.__data__;return data.data ? data.data : data;
            });
        }));
    };
    c3_chart_fn.select = function (ids, indices, resetOther) {
        var $$ = this.internal,
            d3 = $$.d3,
            config = $$.config;
        if (!config.data_selection_enabled) {
            return;
        }
        $$.main.selectAll('.' + CLASS.shapes).selectAll('.' + CLASS.shape).each(function (d, i) {
            var shape = d3.select(this),
                id = d.data ? d.data.id : d.id,
                toggle = $$.getToggle(this, d).bind($$),
                isTargetId = config.data_selection_grouped || !ids || ids.indexOf(id) >= 0,
                isTargetIndex = !indices || indices.indexOf(i) >= 0,
                isSelected = shape.classed(CLASS.SELECTED);
            // line/area selection not supported yet
            if (shape.classed(CLASS.line) || shape.classed(CLASS.area)) {
                return;
            }
            if (isTargetId && isTargetIndex) {
                if (config.data_selection_isselectable(d) && !isSelected) {
                    toggle(true, shape.classed(CLASS.SELECTED, true), d, i);
                }
            } else if (isDefined(resetOther) && resetOther) {
                if (isSelected) {
                    toggle(false, shape.classed(CLASS.SELECTED, false), d, i);
                }
            }
        });
    };
    c3_chart_fn.unselect = function (ids, indices) {
        var $$ = this.internal,
            d3 = $$.d3,
            config = $$.config;
        if (!config.data_selection_enabled) {
            return;
        }
        $$.main.selectAll('.' + CLASS.shapes).selectAll('.' + CLASS.shape).each(function (d, i) {
            var shape = d3.select(this),
                id = d.data ? d.data.id : d.id,
                toggle = $$.getToggle(this, d).bind($$),
                isTargetId = config.data_selection_grouped || !ids || ids.indexOf(id) >= 0,
                isTargetIndex = !indices || indices.indexOf(i) >= 0,
                isSelected = shape.classed(CLASS.SELECTED);
            // line/area selection not supported yet
            if (shape.classed(CLASS.line) || shape.classed(CLASS.area)) {
                return;
            }
            if (isTargetId && isTargetIndex) {
                if (config.data_selection_isselectable(d)) {
                    if (isSelected) {
                        toggle(false, shape.classed(CLASS.SELECTED, false), d, i);
                    }
                }
            }
        });
    };

    c3_chart_fn.show = function (targetIds, options) {
        var $$ = this.internal,
            targets;

        targetIds = $$.mapToTargetIds(targetIds);
        options = options || {};

        $$.removeHiddenTargetIds(targetIds);
        targets = $$.svg.selectAll($$.selectorTargets(targetIds));

        targets.transition().style('opacity', 1, 'important').call($$.endall, function () {
            targets.style('opacity', null).style('opacity', 1);
        });

        if (options.withLegend) {
            $$.showLegend(targetIds);
        }

        $$.redraw({ withUpdateOrgXDomain: true, withUpdateXDomain: true, withLegend: true });
    };

    c3_chart_fn.hide = function (targetIds, options) {
        var $$ = this.internal,
            targets;

        targetIds = $$.mapToTargetIds(targetIds);
        options = options || {};

        $$.addHiddenTargetIds(targetIds);
        targets = $$.svg.selectAll($$.selectorTargets(targetIds));

        targets.transition().style('opacity', 0, 'important').call($$.endall, function () {
            targets.style('opacity', null).style('opacity', 0);
        });

        if (options.withLegend) {
            $$.hideLegend(targetIds);
        }

        $$.redraw({ withUpdateOrgXDomain: true, withUpdateXDomain: true, withLegend: true });
    };

    c3_chart_fn.toggle = function (targetIds, options) {
        var that = this,
            $$ = this.internal;
        $$.mapToTargetIds(targetIds).forEach(function (targetId) {
            $$.isTargetToShow(targetId) ? that.hide(targetId, options) : that.show(targetId, options);
        });
    };

    c3_chart_fn.tooltip = function () {};
    c3_chart_fn.tooltip.show = function (args) {
        var $$ = this.internal,
            targets,
            data,
            mouse = {};

        // determine mouse position on the chart
        if (args.mouse) {
            mouse = args.mouse;
        } else {
            // determine focus data
            if (args.data) {
                data = args.data;
            } else if (typeof args.x !== 'undefined') {
                if (args.id) {
                    targets = $$.data.targets.filter(function (t) {
                        return t.id === args.id;
                    });
                } else {
                    targets = $$.data.targets;
                }
                data = $$.filterByX(targets, args.x).slice(0, 1)[0];
            }
            mouse = data ? $$.getMousePosition(data) : null;
        }

        // emulate mouse events to show
        $$.dispatchEvent('mousemove', mouse);

        $$.config.tooltip_onshow.call($$, data);
    };
    c3_chart_fn.tooltip.hide = function () {
        // TODO: get target data by checking the state of focus
        this.internal.dispatchEvent('mouseout', 0);

        this.internal.config.tooltip_onhide.call(this);
    };

    c3_chart_fn.transform = function (type, targetIds) {
        var $$ = this.internal,
            options = ['pie', 'donut'].indexOf(type) >= 0 ? { withTransform: true } : null;
        $$.transformTo(targetIds, type, options);
    };

    c3_chart_internal_fn.transformTo = function (targetIds, type, optionsForRedraw) {
        var $$ = this,
            withTransitionForAxis = !$$.hasArcType(),
            options = optionsForRedraw || { withTransitionForAxis: withTransitionForAxis };
        options.withTransitionForTransform = false;
        $$.transiting = false;
        $$.setTargetType(targetIds, type);
        $$.updateTargets($$.data.targets); // this is needed when transforming to arc
        $$.updateAndRedraw(options);
    };

    c3_chart_fn.x = function (x) {
        var $$ = this.internal;
        if (arguments.length) {
            $$.updateTargetX($$.data.targets, x);
            $$.redraw({ withUpdateOrgXDomain: true, withUpdateXDomain: true });
        }
        return $$.data.xs;
    };
    c3_chart_fn.xs = function (xs) {
        var $$ = this.internal;
        if (arguments.length) {
            $$.updateTargetXs($$.data.targets, xs);
            $$.redraw({ withUpdateOrgXDomain: true, withUpdateXDomain: true });
        }
        return $$.data.xs;
    };

    c3_chart_fn.zoom = function (domain) {
        var $$ = this.internal;
        if (domain) {
            if ($$.isTimeSeries()) {
                domain = domain.map(function (x) {
                    return $$.parseDate(x);
                });
            }
            if ($$.config.subchart_show) {
                $$.brush.selectionAsValue(domain, true);
            } else {
                $$.updateXDomain(null, true, false, false, domain);
                $$.redraw({ withY: $$.config.zoom_rescale, withSubchart: false });
            }
            $$.config.zoom_onzoom.call(this, $$.x.orgDomain());
        }
        return domain;
    };
    c3_chart_fn.zoom.enable = function (enabled) {
        var $$ = this.internal;
        $$.config.zoom_enabled = enabled;
        $$.updateAndRedraw();
    };
    c3_chart_fn.unzoom = function () {
        var $$ = this.internal;
        if ($$.config.subchart_show) {
            $$.brush.clear();
        } else {
            $$.updateXDomain(null, true, false, false, $$.subX.domain());
            $$.redraw({ withY: $$.config.zoom_rescale, withSubchart: false });
        }
    };

    c3_chart_fn.zoom.max = function (max) {
        var $$ = this.internal,
            config = $$.config,
            d3 = $$.d3;
        if (max === 0 || max) {
            config.zoom_x_max = d3.max([$$.orgXDomain[1], max]);
        } else {
            return config.zoom_x_max;
        }
    };

    c3_chart_fn.zoom.min = function (min) {
        var $$ = this.internal,
            config = $$.config,
            d3 = $$.d3;
        if (min === 0 || min) {
            config.zoom_x_min = d3.min([$$.orgXDomain[0], min]);
        } else {
            return config.zoom_x_min;
        }
    };

    c3_chart_fn.zoom.range = function (range) {
        if (arguments.length) {
            if (isDefined(range.max)) {
                this.domain.max(range.max);
            }
            if (isDefined(range.min)) {
                this.domain.min(range.min);
            }
        } else {
            return {
                max: this.domain.max(),
                min: this.domain.min()
            };
        }
    };

    c3_chart_internal_fn.initPie = function () {
        var $$ = this,
            d3 = $$.d3;
        $$.pie = d3.pie().value(function (d) {
            return d.values.reduce(function (a, b) {
                return a + b.value;
            }, 0);
        });

        var orderFct = $$.getOrderFunction();

        // we need to reverse the returned order if asc or desc to have the slice in expected order.
        if (orderFct && ($$.isOrderAsc() || $$.isOrderDesc())) {
            var defaultSort = orderFct;
            orderFct = function orderFct(t1, t2) {
                return defaultSort(t1, t2) * -1;
            };
        }

        $$.pie.sort(orderFct || null);
    };

    c3_chart_internal_fn.updateRadius = function () {
        var $$ = this,
            config = $$.config,
            w = config.gauge_width || config.donut_width,
            gaugeArcWidth = $$.filterTargetsToShow($$.data.targets).length * $$.config.gauge_arcs_minWidth;
        $$.radiusExpanded = Math.min($$.arcWidth, $$.arcHeight) / 2 * ($$.hasType('gauge') ? 0.85 : 1);
        $$.radius = $$.radiusExpanded * 0.95;
        $$.innerRadiusRatio = w ? ($$.radius - w) / $$.radius : 0.6;
        $$.innerRadius = $$.hasType('donut') || $$.hasType('gauge') ? $$.radius * $$.innerRadiusRatio : 0;
        $$.gaugeArcWidth = w ? w : gaugeArcWidth <= $$.radius - $$.innerRadius ? $$.radius - $$.innerRadius : gaugeArcWidth <= $$.radius ? gaugeArcWidth : $$.radius;
    };

    c3_chart_internal_fn.updateArc = function () {
        var $$ = this;
        $$.svgArc = $$.getSvgArc();
        $$.svgArcExpanded = $$.getSvgArcExpanded();
        $$.svgArcExpandedSub = $$.getSvgArcExpanded(0.98);
    };

    c3_chart_internal_fn.updateAngle = function (d) {
        var $$ = this,
            config = $$.config,
            found = false,
            index = 0,
            gMin,
            gMax,
            gTic,
            gValue;

        if (!config) {
            return null;
        }

        $$.pie($$.filterTargetsToShow($$.data.targets)).forEach(function (t) {
            if (!found && t.data.id === d.data.id) {
                found = true;
                d = t;
                d.index = index;
            }
            index++;
        });
        if (isNaN(d.startAngle)) {
            d.startAngle = 0;
        }
        if (isNaN(d.endAngle)) {
            d.endAngle = d.startAngle;
        }
        if ($$.isGaugeType(d.data)) {
            gMin = config.gauge_min;
            gMax = config.gauge_max;
            gTic = Math.PI * (config.gauge_fullCircle ? 2 : 1) / (gMax - gMin);
            gValue = d.value < gMin ? 0 : d.value < gMax ? d.value - gMin : gMax - gMin;
            d.startAngle = config.gauge_startingAngle;
            d.endAngle = d.startAngle + gTic * gValue;
        }
        return found ? d : null;
    };

    c3_chart_internal_fn.getSvgArc = function () {
        var $$ = this,
            hasGaugeType = $$.hasType('gauge'),
            singleArcWidth = $$.gaugeArcWidth / $$.filterTargetsToShow($$.data.targets).length,
            arc = $$.d3.arc().outerRadius(function (d) {
            return hasGaugeType ? $$.radius - singleArcWidth * d.index : $$.radius;
        }).innerRadius(function (d) {
            return hasGaugeType ? $$.radius - singleArcWidth * (d.index + 1) : $$.innerRadius;
        }),
            newArc = function newArc(d, withoutUpdate) {
            var updated;
            if (withoutUpdate) {
                return arc(d);
            } // for interpolate
            updated = $$.updateAngle(d);
            return updated ? arc(updated) : "M 0 0";
        };
        // TODO: extends all function
        newArc.centroid = arc.centroid;
        return newArc;
    };

    c3_chart_internal_fn.getSvgArcExpanded = function (rate) {
        rate = rate || 1;
        var $$ = this,
            hasGaugeType = $$.hasType('gauge'),
            singleArcWidth = $$.gaugeArcWidth / $$.filterTargetsToShow($$.data.targets).length,
            expandWidth = Math.min($$.radiusExpanded * rate - $$.radius, singleArcWidth * 0.8 - (1 - rate) * 100),
            arc = $$.d3.arc().outerRadius(function (d) {
            return hasGaugeType ? $$.radius - singleArcWidth * d.index + expandWidth : $$.radiusExpanded * rate;
        }).innerRadius(function (d) {
            return hasGaugeType ? $$.radius - singleArcWidth * (d.index + 1) : $$.innerRadius;
        });
        return function (d) {
            var updated = $$.updateAngle(d);
            return updated ? arc(updated) : "M 0 0";
        };
    };

    c3_chart_internal_fn.getArc = function (d, withoutUpdate, force) {
        return force || this.isArcType(d.data) ? this.svgArc(d, withoutUpdate) : "M 0 0";
    };

    c3_chart_internal_fn.transformForArcLabel = function (d) {
        var $$ = this,
            config = $$.config,
            updated = $$.updateAngle(d),
            c,
            x,
            y,
            h,
            ratio,
            translate = "",
            hasGauge = $$.hasType('gauge');
        if (updated && !hasGauge) {
            c = this.svgArc.centroid(updated);
            x = isNaN(c[0]) ? 0 : c[0];
            y = isNaN(c[1]) ? 0 : c[1];
            h = Math.sqrt(x * x + y * y);
            if ($$.hasType('donut') && config.donut_label_ratio) {
                ratio = isFunction(config.donut_label_ratio) ? config.donut_label_ratio(d, $$.radius, h) : config.donut_label_ratio;
            } else if ($$.hasType('pie') && config.pie_label_ratio) {
                ratio = isFunction(config.pie_label_ratio) ? config.pie_label_ratio(d, $$.radius, h) : config.pie_label_ratio;
            } else {
                ratio = $$.radius && h ? (36 / $$.radius > 0.375 ? 1.175 - 36 / $$.radius : 0.8) * $$.radius / h : 0;
            }
            translate = "translate(" + x * ratio + ',' + y * ratio + ")";
        } else if (updated && hasGauge && $$.filterTargetsToShow($$.data.targets).length > 1) {
            var y1 = Math.sin(updated.endAngle - Math.PI / 2);
            x = Math.cos(updated.endAngle - Math.PI / 2) * ($$.radiusExpanded + 25);
            y = y1 * ($$.radiusExpanded + 15 - Math.abs(y1 * 10)) + 3;
            translate = "translate(" + x + ',' + y + ")";
        }
        return translate;
    };

    c3_chart_internal_fn.getArcRatio = function (d) {
        var $$ = this,
            config = $$.config,
            whole = Math.PI * ($$.hasType('gauge') && !config.gauge_fullCircle ? 1 : 2);
        return d ? (d.endAngle - d.startAngle) / whole : null;
    };

    c3_chart_internal_fn.convertToArcData = function (d) {
        return this.addName({
            id: d.data.id,
            value: d.value,
            ratio: this.getArcRatio(d),
            index: d.index
        });
    };

    c3_chart_internal_fn.textForArcLabel = function (d) {
        var $$ = this,
            updated,
            value,
            ratio,
            id,
            format;
        if (!$$.shouldShowArcLabel()) {
            return "";
        }
        updated = $$.updateAngle(d);
        value = updated ? updated.value : null;
        ratio = $$.getArcRatio(updated);
        id = d.data.id;
        if (!$$.hasType('gauge') && !$$.meetsArcLabelThreshold(ratio)) {
            return "";
        }
        format = $$.getArcLabelFormat();
        return format ? format(value, ratio, id) : $$.defaultArcValueFormat(value, ratio);
    };

    c3_chart_internal_fn.textForGaugeMinMax = function (value, isMax) {
        var $$ = this,
            format = $$.getGaugeLabelExtents();

        return format ? format(value, isMax) : value;
    };

    c3_chart_internal_fn.expandArc = function (targetIds) {
        var $$ = this,
            interval;

        // MEMO: avoid to cancel transition
        if ($$.transiting) {
            interval = window.setInterval(function () {
                if (!$$.transiting) {
                    window.clearInterval(interval);
                    if ($$.legend.selectAll('.c3-legend-item-focused').size() > 0) {
                        $$.expandArc(targetIds);
                    }
                }
            }, 10);
            return;
        }

        targetIds = $$.mapToTargetIds(targetIds);

        $$.svg.selectAll($$.selectorTargets(targetIds, '.' + CLASS.chartArc)).each(function (d) {
            if (!$$.shouldExpand(d.data.id)) {
                return;
            }
            $$.d3.select(this).selectAll('path').transition().duration($$.expandDuration(d.data.id)).attr("d", $$.svgArcExpanded).transition().duration($$.expandDuration(d.data.id) * 2).attr("d", $$.svgArcExpandedSub).each(function (d) {
                if ($$.isDonutType(d.data)) {
                    // callback here
                }
            });
        });
    };

    c3_chart_internal_fn.unexpandArc = function (targetIds) {
        var $$ = this;

        if ($$.transiting) {
            return;
        }

        targetIds = $$.mapToTargetIds(targetIds);

        $$.svg.selectAll($$.selectorTargets(targetIds, '.' + CLASS.chartArc)).selectAll('path').transition().duration(function (d) {
            return $$.expandDuration(d.data.id);
        }).attr("d", $$.svgArc);
        $$.svg.selectAll('.' + CLASS.arc);
    };

    c3_chart_internal_fn.expandDuration = function (id) {
        var $$ = this,
            config = $$.config;

        if ($$.isDonutType(id)) {
            return config.donut_expand_duration;
        } else if ($$.isGaugeType(id)) {
            return config.gauge_expand_duration;
        } else if ($$.isPieType(id)) {
            return config.pie_expand_duration;
        } else {
            return 50;
        }
    };

    c3_chart_internal_fn.shouldExpand = function (id) {
        var $$ = this,
            config = $$.config;
        return $$.isDonutType(id) && config.donut_expand || $$.isGaugeType(id) && config.gauge_expand || $$.isPieType(id) && config.pie_expand;
    };

    c3_chart_internal_fn.shouldShowArcLabel = function () {
        var $$ = this,
            config = $$.config,
            shouldShow = true;
        if ($$.hasType('donut')) {
            shouldShow = config.donut_label_show;
        } else if ($$.hasType('pie')) {
            shouldShow = config.pie_label_show;
        }
        // when gauge, always true
        return shouldShow;
    };

    c3_chart_internal_fn.meetsArcLabelThreshold = function (ratio) {
        var $$ = this,
            config = $$.config,
            threshold = $$.hasType('donut') ? config.donut_label_threshold : config.pie_label_threshold;
        return ratio >= threshold;
    };

    c3_chart_internal_fn.getArcLabelFormat = function () {
        var $$ = this,
            config = $$.config,
            format = config.pie_label_format;
        if ($$.hasType('gauge')) {
            format = config.gauge_label_format;
        } else if ($$.hasType('donut')) {
            format = config.donut_label_format;
        }
        return format;
    };

    c3_chart_internal_fn.getGaugeLabelExtents = function () {
        var $$ = this,
            config = $$.config;
        return config.gauge_label_extents;
    };

    c3_chart_internal_fn.getArcTitle = function () {
        var $$ = this;
        return $$.hasType('donut') ? $$.config.donut_title : "";
    };

    c3_chart_internal_fn.updateTargetsForArc = function (targets) {
        var $$ = this,
            main = $$.main,
            mainPies,
            mainPieEnter,
            classChartArc = $$.classChartArc.bind($$),
            classArcs = $$.classArcs.bind($$),
            classFocus = $$.classFocus.bind($$);
        mainPies = main.select('.' + CLASS.chartArcs).selectAll('.' + CLASS.chartArc).data($$.pie(targets)).attr("class", function (d) {
            return classChartArc(d) + classFocus(d.data);
        });
        mainPieEnter = mainPies.enter().append("g").attr("class", classChartArc);
        mainPieEnter.append('g').attr('class', classArcs);
        mainPieEnter.append("text").attr("dy", $$.hasType('gauge') ? "-.1em" : ".35em").style("opacity", 0).style("text-anchor", "middle").style("pointer-events", "none");
        // MEMO: can not keep same color..., but not bad to update color in redraw
        //mainPieUpdate.exit().remove();
    };

    c3_chart_internal_fn.initArc = function () {
        var $$ = this;
        $$.arcs = $$.main.select('.' + CLASS.chart).append("g").attr("class", CLASS.chartArcs).attr("transform", $$.getTranslate('arc'));
        $$.arcs.append('text').attr('class', CLASS.chartArcsTitle).style("text-anchor", "middle").text($$.getArcTitle());
    };

    c3_chart_internal_fn.redrawArc = function (duration, durationForExit, withTransform) {
        var $$ = this,
            d3 = $$.d3,
            config = $$.config,
            main = $$.main,
            arcs,
            mainArc,
            backgroundArc,
            arcLabelLines,
            mainArcLabelLine,
            hasGaugeType = $$.hasType('gauge');
        arcs = main.selectAll('.' + CLASS.arcs).selectAll('.' + CLASS.arc).data($$.arcData.bind($$));
        mainArc = arcs.enter().append('path').attr("class", $$.classArc.bind($$)).style("fill", function (d) {
            return $$.color(d.data);
        }).style("cursor", function (d) {
            return config.interaction_enabled && config.data_selection_isselectable(d) ? "pointer" : null;
        }).each(function (d) {
            if ($$.isGaugeType(d.data)) {
                d.startAngle = d.endAngle = config.gauge_startingAngle;
            }
            this._current = d;
        }).merge(arcs);
        if (hasGaugeType) {
            arcLabelLines = main.selectAll('.' + CLASS.arcs).selectAll('.' + CLASS.arcLabelLine).data($$.arcData.bind($$));
            mainArcLabelLine = arcLabelLines.enter().append('rect').attr("class", function (d) {
                return CLASS.arcLabelLine + ' ' + CLASS.target + ' ' + CLASS.target + '-' + d.data.id;
            }).merge(arcLabelLines);

            if ($$.filterTargetsToShow($$.data.targets).length === 1) {
                mainArcLabelLine.style("display", "none");
            } else {
                mainArcLabelLine.style("fill", function (d) {
                    return config.color_pattern.length > 0 ? $$.levelColor(d.data.values[0].value) : $$.color(d.data);
                }).style("display", config.gauge_labelLine_show ? "" : "none").each(function (d) {
                    var lineLength = 0,
                        lineThickness = 2,
                        x = 0,
                        y = 0,
                        transform = "";
                    if ($$.hiddenTargetIds.indexOf(d.data.id) < 0) {
                        var updated = $$.updateAngle(d),
                            innerLineLength = $$.gaugeArcWidth / $$.filterTargetsToShow($$.data.targets).length * (updated.index + 1),
                            lineAngle = updated.endAngle - Math.PI / 2,
                            arcInnerRadius = $$.radius - innerLineLength,
                            linePositioningAngle = lineAngle - (arcInnerRadius === 0 ? 0 : 1 / arcInnerRadius);
                        lineLength = $$.radiusExpanded - $$.radius + innerLineLength;
                        x = Math.cos(linePositioningAngle) * arcInnerRadius;
                        y = Math.sin(linePositioningAngle) * arcInnerRadius;
                        transform = "rotate(" + lineAngle * 180 / Math.PI + ", " + x + ", " + y + ")";
                    }
                    d3.select(this).attr('x', x).attr('y', y).attr('width', lineLength).attr('height', lineThickness).attr('transform', transform).style("stroke-dasharray", "0, " + (lineLength + lineThickness) + ", 0");
                });
            }
        }
        mainArc.attr("transform", function (d) {
            return !$$.isGaugeType(d.data) && withTransform ? "scale(0)" : "";
        }).on('mouseover', config.interaction_enabled ? function (d) {
            var updated, arcData;
            if ($$.transiting) {
                // skip while transiting
                return;
            }
            updated = $$.updateAngle(d);
            if (updated) {
                arcData = $$.convertToArcData(updated);
                // transitions
                $$.expandArc(updated.data.id);
                $$.api.focus(updated.data.id);
                $$.toggleFocusLegend(updated.data.id, true);
                $$.config.data_onmouseover(arcData, this);
            }
        } : null).on('mousemove', config.interaction_enabled ? function (d) {
            var updated = $$.updateAngle(d),
                arcData,
                selectedData;
            if (updated) {
                arcData = $$.convertToArcData(updated), selectedData = [arcData];
                $$.showTooltip(selectedData, this);
            }
        } : null).on('mouseout', config.interaction_enabled ? function (d) {
            var updated, arcData;
            if ($$.transiting) {
                // skip while transiting
                return;
            }
            updated = $$.updateAngle(d);
            if (updated) {
                arcData = $$.convertToArcData(updated);
                // transitions
                $$.unexpandArc(updated.data.id);
                $$.api.revert();
                $$.revertLegend();
                $$.hideTooltip();
                $$.config.data_onmouseout(arcData, this);
            }
        } : null).on('click', config.interaction_enabled ? function (d, i) {
            var updated = $$.updateAngle(d),
                arcData;
            if (updated) {
                arcData = $$.convertToArcData(updated);
                if ($$.toggleShape) {
                    $$.toggleShape(this, arcData, i);
                }
                $$.config.data_onclick.call($$.api, arcData, this);
            }
        } : null).each(function () {
            $$.transiting = true;
        }).transition().duration(duration).attrTween("d", function (d) {
            var updated = $$.updateAngle(d),
                interpolate;
            if (!updated) {
                return function () {
                    return "M 0 0";
                };
            }
            //                if (this._current === d) {
            //                    this._current = {
            //                        startAngle: Math.PI*2,
            //                        endAngle: Math.PI*2,
            //                    };
            //                }
            if (isNaN(this._current.startAngle)) {
                this._current.startAngle = 0;
            }
            if (isNaN(this._current.endAngle)) {
                this._current.endAngle = this._current.startAngle;
            }
            interpolate = d3.interpolate(this._current, updated);
            this._current = interpolate(0);
            return function (t) {
                var interpolated = interpolate(t);
                interpolated.data = d.data; // data.id will be updated by interporator
                return $$.getArc(interpolated, true);
            };
        }).attr("transform", withTransform ? "scale(1)" : "").style("fill", function (d) {
            return $$.levelColor ? $$.levelColor(d.data.values[0].value) : $$.color(d.data.id);
        }) // Where gauge reading color would receive customization.
        .call($$.endall, function () {
            $$.transiting = false;
        });
        arcs.exit().transition().duration(durationForExit).style('opacity', 0).remove();
        main.selectAll('.' + CLASS.chartArc).select('text').style("opacity", 0).attr('class', function (d) {
            return $$.isGaugeType(d.data) ? CLASS.gaugeValue : '';
        }).text($$.textForArcLabel.bind($$)).attr("transform", $$.transformForArcLabel.bind($$)).style('font-size', function (d) {
            return $$.isGaugeType(d.data) && $$.filterTargetsToShow($$.data.targets).length === 1 ? Math.round($$.radius / 5) + 'px' : '';
        }).transition().duration(duration).style("opacity", function (d) {
            return $$.isTargetToShow(d.data.id) && $$.isArcType(d.data) ? 1 : 0;
        });
        main.select('.' + CLASS.chartArcsTitle).style("opacity", $$.hasType('donut') || hasGaugeType ? 1 : 0);

        if (hasGaugeType) {
            var index = 0;
            backgroundArc = $$.arcs.select('g.' + CLASS.chartArcsBackground).selectAll('path.' + CLASS.chartArcsBackground).data($$.data.targets);
            backgroundArc.enter().append("path");
            backgroundArc.attr("class", function (d, i) {
                return CLASS.chartArcsBackground + ' ' + CLASS.chartArcsBackground + '-' + i;
            }).attr("d", function (d1) {
                if ($$.hiddenTargetIds.indexOf(d1.id) >= 0) {
                    return "M 0 0";
                }

                var d = {
                    data: [{ value: config.gauge_max }],
                    startAngle: config.gauge_startingAngle,
                    endAngle: -1 * config.gauge_startingAngle * (config.gauge_fullCircle ? Math.PI : 1),
                    index: index++
                };
                return $$.getArc(d, true, true);
            });
            backgroundArc.exit().remove();

            $$.arcs.select('.' + CLASS.chartArcsGaugeUnit).attr("dy", ".75em").text(config.gauge_label_show ? config.gauge_units : '');
            $$.arcs.select('.' + CLASS.chartArcsGaugeMin).attr("dx", -1 * ($$.innerRadius + ($$.radius - $$.innerRadius) / (config.gauge_fullCircle ? 1 : 2)) + "px").attr("dy", "1.2em").text(config.gauge_label_show ? $$.textForGaugeMinMax(config.gauge_min, false) : '');
            $$.arcs.select('.' + CLASS.chartArcsGaugeMax).attr("dx", $$.innerRadius + ($$.radius - $$.innerRadius) / (config.gauge_fullCircle ? 1 : 2) + "px").attr("dy", "1.2em").text(config.gauge_label_show ? $$.textForGaugeMinMax(config.gauge_max, true) : '');
        }
    };
    c3_chart_internal_fn.initGauge = function () {
        var arcs = this.arcs;
        if (this.hasType('gauge')) {
            arcs.append('g').attr("class", CLASS.chartArcsBackground);
            arcs.append("text").attr("class", CLASS.chartArcsGaugeUnit).style("text-anchor", "middle").style("pointer-events", "none");
            arcs.append("text").attr("class", CLASS.chartArcsGaugeMin).style("text-anchor", "middle").style("pointer-events", "none");
            arcs.append("text").attr("class", CLASS.chartArcsGaugeMax).style("text-anchor", "middle").style("pointer-events", "none");
        }
    };
    c3_chart_internal_fn.getGaugeLabelHeight = function () {
        return this.config.gauge_label_show ? 20 : 0;
    };

    c3_chart_internal_fn.hasCaches = function (ids) {
        for (var i = 0; i < ids.length; i++) {
            if (!(ids[i] in this.cache)) {
                return false;
            }
        }
        return true;
    };
    c3_chart_internal_fn.addCache = function (id, target) {
        this.cache[id] = this.cloneTarget(target);
    };
    c3_chart_internal_fn.getCaches = function (ids) {
        var targets = [],
            i;
        for (i = 0; i < ids.length; i++) {
            if (ids[i] in this.cache) {
                targets.push(this.cloneTarget(this.cache[ids[i]]));
            }
        }
        return targets;
    };

    c3_chart_internal_fn.categoryName = function (i) {
        var config = this.config;
        return i < config.axis_x_categories.length ? config.axis_x_categories[i] : i;
    };

    c3_chart_internal_fn.generateTargetClass = function (targetId) {
        return targetId || targetId === 0 ? ('-' + targetId).replace(/\s/g, '-') : '';
    };
    c3_chart_internal_fn.generateClass = function (prefix, targetId) {
        return " " + prefix + " " + prefix + this.generateTargetClass(targetId);
    };
    c3_chart_internal_fn.classText = function (d) {
        return this.generateClass(CLASS.text, d.index);
    };
    c3_chart_internal_fn.classTexts = function (d) {
        return this.generateClass(CLASS.texts, d.id);
    };
    c3_chart_internal_fn.classShape = function (d) {
        return this.generateClass(CLASS.shape, d.index);
    };
    c3_chart_internal_fn.classShapes = function (d) {
        return this.generateClass(CLASS.shapes, d.id);
    };
    c3_chart_internal_fn.classLine = function (d) {
        return this.classShape(d) + this.generateClass(CLASS.line, d.id);
    };
    c3_chart_internal_fn.classLines = function (d) {
        return this.classShapes(d) + this.generateClass(CLASS.lines, d.id);
    };
    c3_chart_internal_fn.classCircle = function (d) {
        return this.classShape(d) + this.generateClass(CLASS.circle, d.index);
    };
    c3_chart_internal_fn.classCircles = function (d) {
        return this.classShapes(d) + this.generateClass(CLASS.circles, d.id);
    };
    c3_chart_internal_fn.classBar = function (d) {
        return this.classShape(d) + this.generateClass(CLASS.bar, d.index);
    };
    c3_chart_internal_fn.classBars = function (d) {
        return this.classShapes(d) + this.generateClass(CLASS.bars, d.id);
    };
    c3_chart_internal_fn.classArc = function (d) {
        return this.classShape(d.data) + this.generateClass(CLASS.arc, d.data.id);
    };
    c3_chart_internal_fn.classArcs = function (d) {
        return this.classShapes(d.data) + this.generateClass(CLASS.arcs, d.data.id);
    };
    c3_chart_internal_fn.classArea = function (d) {
        return this.classShape(d) + this.generateClass(CLASS.area, d.id);
    };
    c3_chart_internal_fn.classAreas = function (d) {
        return this.classShapes(d) + this.generateClass(CLASS.areas, d.id);
    };
    c3_chart_internal_fn.classRegion = function (d, i) {
        return this.generateClass(CLASS.region, i) + ' ' + ('class' in d ? d['class'] : '');
    };
    c3_chart_internal_fn.classEvent = function (d) {
        return this.generateClass(CLASS.eventRect, d.index);
    };
    c3_chart_internal_fn.classTarget = function (id) {
        var $$ = this;
        var additionalClassSuffix = $$.config.data_classes[id],
            additionalClass = '';
        if (additionalClassSuffix) {
            additionalClass = ' ' + CLASS.target + '-' + additionalClassSuffix;
        }
        return $$.generateClass(CLASS.target, id) + additionalClass;
    };
    c3_chart_internal_fn.classFocus = function (d) {
        return this.classFocused(d) + this.classDefocused(d);
    };
    c3_chart_internal_fn.classFocused = function (d) {
        return ' ' + (this.focusedTargetIds.indexOf(d.id) >= 0 ? CLASS.focused : '');
    };
    c3_chart_internal_fn.classDefocused = function (d) {
        return ' ' + (this.defocusedTargetIds.indexOf(d.id) >= 0 ? CLASS.defocused : '');
    };
    c3_chart_internal_fn.classChartText = function (d) {
        return CLASS.chartText + this.classTarget(d.id);
    };
    c3_chart_internal_fn.classChartLine = function (d) {
        return CLASS.chartLine + this.classTarget(d.id);
    };
    c3_chart_internal_fn.classChartBar = function (d) {
        return CLASS.chartBar + this.classTarget(d.id);
    };
    c3_chart_internal_fn.classChartArc = function (d) {
        return CLASS.chartArc + this.classTarget(d.data.id);
    };
    c3_chart_internal_fn.getTargetSelectorSuffix = function (targetId) {
        return this.generateTargetClass(targetId).replace(/([?!@#$%^&*()_=+,.<>'":;\[\]\/|~`{}\\])/g, '\\$1');
    };
    c3_chart_internal_fn.selectorTarget = function (id, prefix) {
        return (prefix || '') + '.' + CLASS.target + this.getTargetSelectorSuffix(id);
    };
    c3_chart_internal_fn.selectorTargets = function (ids, prefix) {
        var $$ = this;
        ids = ids || [];
        return ids.length ? ids.map(function (id) {
            return $$.selectorTarget(id, prefix);
        }) : null;
    };
    c3_chart_internal_fn.selectorLegend = function (id) {
        return '.' + CLASS.legendItem + this.getTargetSelectorSuffix(id);
    };
    c3_chart_internal_fn.selectorLegends = function (ids) {
        var $$ = this;
        return ids && ids.length ? ids.map(function (id) {
            return $$.selectorLegend(id);
        }) : null;
    };

    c3_chart_internal_fn.getClipPath = function (id) {
        var isIE9 = window.navigator.appVersion.toLowerCase().indexOf("msie 9.") >= 0;
        return "url(" + (isIE9 ? "" : document.URL.split('#')[0]) + "#" + id + ")";
    };
    c3_chart_internal_fn.appendClip = function (parent, id) {
        return parent.append("clipPath").attr("id", id).append("rect");
    };
    c3_chart_internal_fn.getAxisClipX = function (forHorizontal) {
        // axis line width + padding for left
        var left = Math.max(30, this.margin.left);
        return forHorizontal ? -(1 + left) : -(left - 1);
    };
    c3_chart_internal_fn.getAxisClipY = function (forHorizontal) {
        return forHorizontal ? -20 : -this.margin.top;
    };
    c3_chart_internal_fn.getXAxisClipX = function () {
        var $$ = this;
        return $$.getAxisClipX(!$$.config.axis_rotated);
    };
    c3_chart_internal_fn.getXAxisClipY = function () {
        var $$ = this;
        return $$.getAxisClipY(!$$.config.axis_rotated);
    };
    c3_chart_internal_fn.getYAxisClipX = function () {
        var $$ = this;
        return $$.config.axis_y_inner ? -1 : $$.getAxisClipX($$.config.axis_rotated);
    };
    c3_chart_internal_fn.getYAxisClipY = function () {
        var $$ = this;
        return $$.getAxisClipY($$.config.axis_rotated);
    };
    c3_chart_internal_fn.getAxisClipWidth = function (forHorizontal) {
        var $$ = this,
            left = Math.max(30, $$.margin.left),
            right = Math.max(30, $$.margin.right);
        // width + axis line width + padding for left/right
        return forHorizontal ? $$.width + 2 + left + right : $$.margin.left + 20;
    };
    c3_chart_internal_fn.getAxisClipHeight = function (forHorizontal) {
        // less than 20 is not enough to show the axis label 'outer' without legend
        return (forHorizontal ? this.margin.bottom : this.margin.top + this.height) + 20;
    };
    c3_chart_internal_fn.getXAxisClipWidth = function () {
        var $$ = this;
        return $$.getAxisClipWidth(!$$.config.axis_rotated);
    };
    c3_chart_internal_fn.getXAxisClipHeight = function () {
        var $$ = this;
        return $$.getAxisClipHeight(!$$.config.axis_rotated);
    };
    c3_chart_internal_fn.getYAxisClipWidth = function () {
        var $$ = this;
        return $$.getAxisClipWidth($$.config.axis_rotated) + ($$.config.axis_y_inner ? 20 : 0);
    };
    c3_chart_internal_fn.getYAxisClipHeight = function () {
        var $$ = this;
        return $$.getAxisClipHeight($$.config.axis_rotated);
    };

    c3_chart_internal_fn.generateColor = function () {
        var $$ = this,
            config = $$.config,
            d3 = $$.d3,
            colors = config.data_colors,
            pattern = notEmpty(config.color_pattern) ? config.color_pattern : d3.schemeCategory10,
            callback = config.data_color,
            ids = [];

        return function (d) {
            var id = d.id || d.data && d.data.id || d,
                color;

            // if callback function is provided
            if (colors[id] instanceof Function) {
                color = colors[id](d);
            }
            // if specified, choose that color
            else if (colors[id]) {
                    color = colors[id];
                }
                // if not specified, choose from pattern
                else {
                        if (ids.indexOf(id) < 0) {
                            ids.push(id);
                        }
                        color = pattern[ids.indexOf(id) % pattern.length];
                        colors[id] = color;
                    }
            return callback instanceof Function ? callback(color, d) : color;
        };
    };
    c3_chart_internal_fn.generateLevelColor = function () {
        var $$ = this,
            config = $$.config,
            colors = config.color_pattern,
            threshold = config.color_threshold,
            asValue = threshold.unit === 'value',
            values = threshold.values && threshold.values.length ? threshold.values : [],
            max = threshold.max || 100;
        return notEmpty(config.color_threshold) ? function (value) {
            var i,
                v,
                color = colors[colors.length - 1];
            for (i = 0; i < values.length; i++) {
                v = asValue ? value : value * 100 / max;
                if (v < values[i]) {
                    color = colors[i];
                    break;
                }
            }
            return color;
        } : null;
    };

    c3_chart_internal_fn.getDefaultConfig = function () {
        var config = {
            bindto: '#chart',
            svg_classname: undefined,
            size_width: undefined,
            size_height: undefined,
            padding_left: undefined,
            padding_right: undefined,
            padding_top: undefined,
            padding_bottom: undefined,
            resize_auto: true,
            zoom_enabled: false,
            zoom_initialRange: undefined,
            zoom_privileged: false,
            zoom_rescale: false,
            zoom_onzoom: function zoom_onzoom() {},
            zoom_onzoomstart: function zoom_onzoomstart() {},
            zoom_onzoomend: function zoom_onzoomend() {},
            zoom_x_min: undefined,
            zoom_x_max: undefined,
            interaction_brighten: true,
            interaction_enabled: true,
            onmouseover: function onmouseover() {},
            onmouseout: function onmouseout() {},
            onresize: function onresize() {},
            onresized: function onresized() {},
            oninit: function oninit() {},
            onrendered: function onrendered() {},
            transition_duration: 350,
            data_x: undefined,
            data_xs: {},
            data_xFormat: '%Y-%m-%d',
            data_xLocaltime: true,
            data_xSort: true,
            data_idConverter: function data_idConverter(id) {
                return id;
            },
            data_names: {},
            data_classes: {},
            data_groups: [],
            data_axes: {},
            data_type: undefined,
            data_types: {},
            data_labels: {},
            data_order: 'desc',
            data_regions: {},
            data_color: undefined,
            data_colors: {},
            data_hide: false,
            data_filter: undefined,
            data_selection_enabled: false,
            data_selection_grouped: false,
            data_selection_isselectable: function data_selection_isselectable() {
                return true;
            },
            data_selection_multiple: true,
            data_selection_draggable: false,
            data_onclick: function data_onclick() {},
            data_onmouseover: function data_onmouseover() {},
            data_onmouseout: function data_onmouseout() {},
            data_onselected: function data_onselected() {},
            data_onunselected: function data_onunselected() {},
            data_url: undefined,
            data_headers: undefined,
            data_json: undefined,
            data_rows: undefined,
            data_columns: undefined,
            data_mimeType: undefined,
            data_keys: undefined,
            // configuration for no plot-able data supplied.
            data_empty_label_text: "",
            // subchart
            subchart_show: false,
            subchart_size_height: 60,
            subchart_axis_x_show: true,
            subchart_onbrush: function subchart_onbrush() {},
            // color
            color_pattern: [],
            color_threshold: {},
            // legend
            legend_show: true,
            legend_hide: false,
            legend_position: 'bottom',
            legend_inset_anchor: 'top-left',
            legend_inset_x: 10,
            legend_inset_y: 0,
            legend_inset_step: undefined,
            legend_item_onclick: undefined,
            legend_item_onmouseover: undefined,
            legend_item_onmouseout: undefined,
            legend_equally: false,
            legend_padding: 0,
            legend_item_tile_width: 10,
            legend_item_tile_height: 10,
            // axis
            axis_rotated: false,
            axis_x_show: true,
            axis_x_type: 'indexed',
            axis_x_localtime: true,
            axis_x_categories: [],
            axis_x_tick_centered: false,
            axis_x_tick_format: undefined,
            axis_x_tick_culling: {},
            axis_x_tick_culling_max: 10,
            axis_x_tick_count: undefined,
            axis_x_tick_fit: true,
            axis_x_tick_values: null,
            axis_x_tick_rotate: 0,
            axis_x_tick_outer: true,
            axis_x_tick_multiline: true,
            axis_x_tick_width: null,
            axis_x_max: undefined,
            axis_x_min: undefined,
            axis_x_padding: {},
            axis_x_height: undefined,
            axis_x_selection: undefined,
            axis_x_label: {},
            axis_x_inner: undefined,
            axis_y_show: true,
            axis_y_type: undefined,
            axis_y_max: undefined,
            axis_y_min: undefined,
            axis_y_inverted: false,
            axis_y_center: undefined,
            axis_y_inner: undefined,
            axis_y_label: {},
            axis_y_tick_format: undefined,
            axis_y_tick_outer: true,
            axis_y_tick_values: null,
            axis_y_tick_rotate: 0,
            axis_y_tick_count: undefined,
            axis_y_tick_time_type: undefined,
            axis_y_tick_time_interval: undefined,
            axis_y_padding: {},
            axis_y_default: undefined,
            axis_y2_show: false,
            axis_y2_max: undefined,
            axis_y2_min: undefined,
            axis_y2_inverted: false,
            axis_y2_center: undefined,
            axis_y2_inner: undefined,
            axis_y2_label: {},
            axis_y2_tick_format: undefined,
            axis_y2_tick_outer: true,
            axis_y2_tick_values: null,
            axis_y2_tick_count: undefined,
            axis_y2_padding: {},
            axis_y2_default: undefined,
            // grid
            grid_x_show: false,
            grid_x_type: 'tick',
            grid_x_lines: [],
            grid_y_show: false,
            // not used
            // grid_y_type: 'tick',
            grid_y_lines: [],
            grid_y_ticks: 10,
            grid_focus_show: true,
            grid_lines_front: true,
            // point - point of each data
            point_show: true,
            point_r: 2.5,
            point_sensitivity: 10,
            point_focus_expand_enabled: true,
            point_focus_expand_r: undefined,
            point_select_r: undefined,
            // line
            line_connectNull: false,
            line_step_type: 'step',
            // bar
            bar_width: undefined,
            bar_width_ratio: 0.6,
            bar_width_max: undefined,
            bar_zerobased: true,
            bar_space: 0,
            // area
            area_zerobased: true,
            area_above: false,
            // pie
            pie_label_show: true,
            pie_label_format: undefined,
            pie_label_threshold: 0.05,
            pie_label_ratio: undefined,
            pie_expand: {},
            pie_expand_duration: 50,
            // gauge
            gauge_fullCircle: false,
            gauge_label_show: true,
            gauge_labelLine_show: true,
            gauge_label_format: undefined,
            gauge_min: 0,
            gauge_max: 100,
            gauge_startingAngle: -1 * Math.PI / 2,
            gauge_label_extents: undefined,
            gauge_units: undefined,
            gauge_width: undefined,
            gauge_arcs_minWidth: 5,
            gauge_expand: {},
            gauge_expand_duration: 50,
            // donut
            donut_label_show: true,
            donut_label_format: undefined,
            donut_label_threshold: 0.05,
            donut_label_ratio: undefined,
            donut_width: undefined,
            donut_title: "",
            donut_expand: {},
            donut_expand_duration: 50,
            // spline
            spline_interpolation_type: 'cardinal',
            // region - region to change style
            regions: [],
            // tooltip - show when mouseover on each data
            tooltip_show: true,
            tooltip_grouped: true,
            tooltip_order: undefined,
            tooltip_format_title: undefined,
            tooltip_format_name: undefined,
            tooltip_format_value: undefined,
            tooltip_position: undefined,
            tooltip_contents: function tooltip_contents(d, defaultTitleFormat, defaultValueFormat, color) {
                return this.getTooltipContent ? this.getTooltipContent(d, defaultTitleFormat, defaultValueFormat, color) : '';
            },
            tooltip_init_show: false,
            tooltip_init_x: 0,
            tooltip_init_position: { top: '0px', left: '50px' },
            tooltip_onshow: function tooltip_onshow() {},
            tooltip_onhide: function tooltip_onhide() {},
            // title
            title_text: undefined,
            title_padding: {
                top: 0,
                right: 0,
                bottom: 0,
                left: 0
            },
            title_position: 'top-center'
        };

        Object.keys(this.additionalConfig).forEach(function (key) {
            config[key] = this.additionalConfig[key];
        }, this);

        return config;
    };
    c3_chart_internal_fn.additionalConfig = {};

    c3_chart_internal_fn.loadConfig = function (config) {
        var this_config = this.config,
            target,
            keys,
            read;
        function find() {
            var key = keys.shift();
            //        console.log("key =>", key, ", target =>", target);
            if (key && target && (typeof target === 'undefined' ? 'undefined' : _typeof(target)) === 'object' && key in target) {
                target = target[key];
                return find();
            } else if (!key) {
                return target;
            } else {
                return undefined;
            }
        }
        Object.keys(this_config).forEach(function (key) {
            target = config;
            keys = key.split('_');
            read = find();
            //        console.log("CONFIG : ", key, read);
            if (isDefined(read)) {
                this_config[key] = read;
            }
        });
    };

    c3_chart_internal_fn.convertUrlToData = function (url, mimeType, headers, keys, done) {
        var $$ = this,
            type = mimeType ? mimeType : 'csv';
        var req = $$.d3.request(url);
        if (headers) {
            Object.keys(headers).forEach(function (header) {
                req.header(header, headers[header]);
            });
        }
        req.get(function (error, data) {
            var d;
            var dataResponse = data.response || data.responseText; // Fixes IE9 XHR issue; see #1345
            if (!data) {
                throw new Error(error.responseURL + ' ' + error.status + ' (' + error.statusText + ')');
            }
            if (type === 'json') {
                d = $$.convertJsonToData(JSON.parse(dataResponse), keys);
            } else if (type === 'tsv') {
                d = $$.convertTsvToData(dataResponse);
            } else {
                d = $$.convertCsvToData(dataResponse);
            }
            done.call($$, d);
        });
    };
    c3_chart_internal_fn.convertXsvToData = function (xsv, parser) {
        var _parser$parseRows = parser.parseRows(xsv),
            _parser$parseRows2 = toArray(_parser$parseRows),
            keys = _parser$parseRows2[0],
            rows = _parser$parseRows2.slice(1);

        if (rows.length === 0) {
            return { keys: keys, rows: [keys.reduce(function (row, key) {
                    return Object.assign(row, defineProperty({}, key, null));
                }, {})] };
        } else {
            // [].concat() is to convert result into a plain array otherwise
            // test is not happy because rows have properties.
            return { keys: keys, rows: [].concat(parser.parse(xsv)) };
        }
    };
    c3_chart_internal_fn.convertCsvToData = function (csv) {
        return this.convertXsvToData(csv, { parse: this.d3.csvParse, parseRows: this.d3.csvParseRows });
    };
    c3_chart_internal_fn.convertTsvToData = function (tsv) {
        return this.convertXsvToData(tsv, { parse: this.d3.tsvParse, parseRows: this.d3.tsvParseRows });
    };
    c3_chart_internal_fn.convertJsonToData = function (json, keys) {
        var $$ = this,
            new_rows = [],
            targetKeys,
            data;
        if (keys) {
            // when keys specified, json would be an array that includes objects
            if (keys.x) {
                targetKeys = keys.value.concat(keys.x);
                $$.config.data_x = keys.x;
            } else {
                targetKeys = keys.value;
            }
            new_rows.push(targetKeys);
            json.forEach(function (o) {
                var new_row = [];
                targetKeys.forEach(function (key) {
                    // convert undefined to null because undefined data will be removed in convertDataToTargets()
                    var v = $$.findValueInJson(o, key);
                    if (isUndefined(v)) {
                        v = null;
                    }
                    new_row.push(v);
                });
                new_rows.push(new_row);
            });
            data = $$.convertRowsToData(new_rows);
        } else {
            Object.keys(json).forEach(function (key) {
                new_rows.push([key].concat(json[key]));
            });
            data = $$.convertColumnsToData(new_rows);
        }
        return data;
    };
    c3_chart_internal_fn.findValueInJson = function (object, path) {
        path = path.replace(/\[(\w+)\]/g, '.$1'); // convert indexes to properties (replace [] with .)
        path = path.replace(/^\./, ''); // strip a leading dot
        var pathArray = path.split('.');
        for (var i = 0; i < pathArray.length; ++i) {
            var k = pathArray[i];
            if (k in object) {
                object = object[k];
            } else {
                return;
            }
        }
        return object;
    };

    /**
     * Converts the rows to normalized data.
     * @param {any[][]} rows The row data
     * @return {Object}
     */
    c3_chart_internal_fn.convertRowsToData = function (rows) {
        var newRows = [];
        var keys = rows[0];

        for (var i = 1; i < rows.length; i++) {
            var newRow = {};
            for (var j = 0; j < rows[i].length; j++) {
                if (isUndefined(rows[i][j])) {
                    throw new Error("Source data is missing a component at (" + i + "," + j + ")!");
                }
                newRow[keys[j]] = rows[i][j];
            }
            newRows.push(newRow);
        }
        return { keys: keys, rows: newRows };
    };

    /**
     * Converts the columns to normalized data.
     * @param {any[][]} columns The column data
     * @return {Object}
     */
    c3_chart_internal_fn.convertColumnsToData = function (columns) {
        var newRows = [];
        var keys = [];

        for (var i = 0; i < columns.length; i++) {
            var key = columns[i][0];
            for (var j = 1; j < columns[i].length; j++) {
                if (isUndefined(newRows[j - 1])) {
                    newRows[j - 1] = {};
                }
                if (isUndefined(columns[i][j])) {
                    throw new Error("Source data is missing a component at (" + i + "," + j + ")!");
                }
                newRows[j - 1][key] = columns[i][j];
            }
            keys.push(key);
        }

        return { keys: keys, rows: newRows };
    };

    /**
     * Converts the data format into the target format.
     * @param {!Object} data
     * @param {!Array} data.keys Ordered list of target IDs.
     * @param {!Array} data.rows Rows of data to convert.
     * @param {boolean} appendXs True to append to $$.data.xs, False to replace.
     * @return {!Array}
     */
    c3_chart_internal_fn.convertDataToTargets = function (data, appendXs) {
        var $$ = this,
            config = $$.config,
            targets,
            ids,
            xs,
            keys;

        // handles format where keys are not orderly provided
        if (isArray(data)) {
            keys = Object.keys(data[0]);
        } else {
            keys = data.keys;
            data = data.rows;
        }

        ids = keys.filter($$.isNotX, $$);
        xs = keys.filter($$.isX, $$);

        // save x for update data by load when custom x and c3.x API
        ids.forEach(function (id) {
            var xKey = $$.getXKey(id);

            if ($$.isCustomX() || $$.isTimeSeries()) {
                // if included in input data
                if (xs.indexOf(xKey) >= 0) {
                    $$.data.xs[id] = (appendXs && $$.data.xs[id] ? $$.data.xs[id] : []).concat(data.map(function (d) {
                        return d[xKey];
                    }).filter(isValue).map(function (rawX, i) {
                        return $$.generateTargetX(rawX, id, i);
                    }));
                }
                // if not included in input data, find from preloaded data of other id's x
                else if (config.data_x) {
                        $$.data.xs[id] = $$.getOtherTargetXs();
                    }
                    // if not included in input data, find from preloaded data
                    else if (notEmpty(config.data_xs)) {
                            $$.data.xs[id] = $$.getXValuesOfXKey(xKey, $$.data.targets);
                        }
                // MEMO: if no x included, use same x of current will be used
            } else {
                $$.data.xs[id] = data.map(function (d, i) {
                    return i;
                });
            }
        });

        // check x is defined
        ids.forEach(function (id) {
            if (!$$.data.xs[id]) {
                throw new Error('x is not defined for id = "' + id + '".');
            }
        });

        // convert to target
        targets = ids.map(function (id, index) {
            var convertedId = config.data_idConverter(id);
            return {
                id: convertedId,
                id_org: id,
                values: data.map(function (d, i) {
                    var xKey = $$.getXKey(id),
                        rawX = d[xKey],
                        value = d[id] !== null && !isNaN(d[id]) ? +d[id] : null,
                        x;
                    // use x as categories if custom x and categorized
                    if ($$.isCustomX() && $$.isCategorized() && !isUndefined(rawX)) {
                        if (index === 0 && i === 0) {
                            config.axis_x_categories = [];
                        }
                        x = config.axis_x_categories.indexOf(rawX);
                        if (x === -1) {
                            x = config.axis_x_categories.length;
                            config.axis_x_categories.push(rawX);
                        }
                    } else {
                        x = $$.generateTargetX(rawX, id, i);
                    }
                    // mark as x = undefined if value is undefined and filter to remove after mapped
                    if (isUndefined(d[id]) || $$.data.xs[id].length <= i) {
                        x = undefined;
                    }
                    return { x: x, value: value, id: convertedId };
                }).filter(function (v) {
                    return isDefined(v.x);
                })
            };
        });

        // finish targets
        targets.forEach(function (t) {
            var i;
            // sort values by its x
            if (config.data_xSort) {
                t.values = t.values.sort(function (v1, v2) {
                    var x1 = v1.x || v1.x === 0 ? v1.x : Infinity,
                        x2 = v2.x || v2.x === 0 ? v2.x : Infinity;
                    return x1 - x2;
                });
            }
            // indexing each value
            i = 0;
            t.values.forEach(function (v) {
                v.index = i++;
            });
            // this needs to be sorted because its index and value.index is identical
            $$.data.xs[t.id].sort(function (v1, v2) {
                return v1 - v2;
            });
        });

        // cache information about values
        $$.hasNegativeValue = $$.hasNegativeValueInTargets(targets);
        $$.hasPositiveValue = $$.hasPositiveValueInTargets(targets);

        // set target types
        if (config.data_type) {
            $$.setTargetType($$.mapToIds(targets).filter(function (id) {
                return !(id in config.data_types);
            }), config.data_type);
        }

        // cache as original id keyed
        targets.forEach(function (d) {
            $$.addCache(d.id_org, d);
        });

        return targets;
    };

    c3_chart_internal_fn.isX = function (key) {
        var $$ = this,
            config = $$.config;
        return config.data_x && key === config.data_x || notEmpty(config.data_xs) && hasValue(config.data_xs, key);
    };
    c3_chart_internal_fn.isNotX = function (key) {
        return !this.isX(key);
    };
    c3_chart_internal_fn.getXKey = function (id) {
        var $$ = this,
            config = $$.config;
        return config.data_x ? config.data_x : notEmpty(config.data_xs) ? config.data_xs[id] : null;
    };
    c3_chart_internal_fn.getXValuesOfXKey = function (key, targets) {
        var $$ = this,
            xValues,
            ids = targets && notEmpty(targets) ? $$.mapToIds(targets) : [];
        ids.forEach(function (id) {
            if ($$.getXKey(id) === key) {
                xValues = $$.data.xs[id];
            }
        });
        return xValues;
    };
    c3_chart_internal_fn.getXValue = function (id, i) {
        var $$ = this;
        return id in $$.data.xs && $$.data.xs[id] && isValue($$.data.xs[id][i]) ? $$.data.xs[id][i] : i;
    };
    c3_chart_internal_fn.getOtherTargetXs = function () {
        var $$ = this,
            idsForX = Object.keys($$.data.xs);
        return idsForX.length ? $$.data.xs[idsForX[0]] : null;
    };
    c3_chart_internal_fn.getOtherTargetX = function (index) {
        var xs = this.getOtherTargetXs();
        return xs && index < xs.length ? xs[index] : null;
    };
    c3_chart_internal_fn.addXs = function (xs) {
        var $$ = this;
        Object.keys(xs).forEach(function (id) {
            $$.config.data_xs[id] = xs[id];
        });
    };
    c3_chart_internal_fn.addName = function (data) {
        var $$ = this,
            name;
        if (data) {
            name = $$.config.data_names[data.id];
            data.name = name !== undefined ? name : data.id;
        }
        return data;
    };
    c3_chart_internal_fn.getValueOnIndex = function (values, index) {
        var valueOnIndex = values.filter(function (v) {
            return v.index === index;
        });
        return valueOnIndex.length ? valueOnIndex[0] : null;
    };
    c3_chart_internal_fn.updateTargetX = function (targets, x) {
        var $$ = this;
        targets.forEach(function (t) {
            t.values.forEach(function (v, i) {
                v.x = $$.generateTargetX(x[i], t.id, i);
            });
            $$.data.xs[t.id] = x;
        });
    };
    c3_chart_internal_fn.updateTargetXs = function (targets, xs) {
        var $$ = this;
        targets.forEach(function (t) {
            if (xs[t.id]) {
                $$.updateTargetX([t], xs[t.id]);
            }
        });
    };
    c3_chart_internal_fn.generateTargetX = function (rawX, id, index) {
        var $$ = this,
            x;
        if ($$.isTimeSeries()) {
            x = rawX ? $$.parseDate(rawX) : $$.parseDate($$.getXValue(id, index));
        } else if ($$.isCustomX() && !$$.isCategorized()) {
            x = isValue(rawX) ? +rawX : $$.getXValue(id, index);
        } else {
            x = index;
        }
        return x;
    };
    c3_chart_internal_fn.cloneTarget = function (target) {
        return {
            id: target.id,
            id_org: target.id_org,
            values: target.values.map(function (d) {
                return { x: d.x, value: d.value, id: d.id };
            })
        };
    };
    c3_chart_internal_fn.getMaxDataCount = function () {
        var $$ = this;
        return $$.d3.max($$.data.targets, function (t) {
            return t.values.length;
        });
    };
    c3_chart_internal_fn.mapToIds = function (targets) {
        return targets.map(function (d) {
            return d.id;
        });
    };
    c3_chart_internal_fn.mapToTargetIds = function (ids) {
        var $$ = this;
        return ids ? [].concat(ids) : $$.mapToIds($$.data.targets);
    };
    c3_chart_internal_fn.hasTarget = function (targets, id) {
        var ids = this.mapToIds(targets),
            i;
        for (i = 0; i < ids.length; i++) {
            if (ids[i] === id) {
                return true;
            }
        }
        return false;
    };
    c3_chart_internal_fn.isTargetToShow = function (targetId) {
        return this.hiddenTargetIds.indexOf(targetId) < 0;
    };
    c3_chart_internal_fn.isLegendToShow = function (targetId) {
        return this.hiddenLegendIds.indexOf(targetId) < 0;
    };
    c3_chart_internal_fn.filterTargetsToShow = function (targets) {
        var $$ = this;
        return targets.filter(function (t) {
            return $$.isTargetToShow(t.id);
        });
    };
    c3_chart_internal_fn.mapTargetsToUniqueXs = function (targets) {
        var $$ = this;
        var xs = $$.d3.set($$.d3.merge(targets.map(function (t) {
            return t.values.map(function (v) {
                return +v.x;
            });
        }))).values();
        xs = $$.isTimeSeries() ? xs.map(function (x) {
            return new Date(+x);
        }) : xs.map(function (x) {
            return +x;
        });
        return xs.sort(function (a, b) {
            return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;
        });
    };
    c3_chart_internal_fn.addHiddenTargetIds = function (targetIds) {
        targetIds = targetIds instanceof Array ? targetIds : new Array(targetIds);
        for (var i = 0; i < targetIds.length; i++) {
            if (this.hiddenTargetIds.indexOf(targetIds[i]) < 0) {
                this.hiddenTargetIds = this.hiddenTargetIds.concat(targetIds[i]);
            }
        }
    };
    c3_chart_internal_fn.removeHiddenTargetIds = function (targetIds) {
        this.hiddenTargetIds = this.hiddenTargetIds.filter(function (id) {
            return targetIds.indexOf(id) < 0;
        });
    };
    c3_chart_internal_fn.addHiddenLegendIds = function (targetIds) {
        targetIds = targetIds instanceof Array ? targetIds : new Array(targetIds);
        for (var i = 0; i < targetIds.length; i++) {
            if (this.hiddenLegendIds.indexOf(targetIds[i]) < 0) {
                this.hiddenLegendIds = this.hiddenLegendIds.concat(targetIds[i]);
            }
        }
    };
    c3_chart_internal_fn.removeHiddenLegendIds = function (targetIds) {
        this.hiddenLegendIds = this.hiddenLegendIds.filter(function (id) {
            return targetIds.indexOf(id) < 0;
        });
    };
    c3_chart_internal_fn.getValuesAsIdKeyed = function (targets) {
        var ys = {};
        targets.forEach(function (t) {
            ys[t.id] = [];
            t.values.forEach(function (v) {
                ys[t.id].push(v.value);
            });
        });
        return ys;
    };
    c3_chart_internal_fn.checkValueInTargets = function (targets, checker) {
        var ids = Object.keys(targets),
            i,
            j,
            values;
        for (i = 0; i < ids.length; i++) {
            values = targets[ids[i]].values;
            for (j = 0; j < values.length; j++) {
                if (checker(values[j].value)) {
                    return true;
                }
            }
        }
        return false;
    };
    c3_chart_internal_fn.hasNegativeValueInTargets = function (targets) {
        return this.checkValueInTargets(targets, function (v) {
            return v < 0;
        });
    };
    c3_chart_internal_fn.hasPositiveValueInTargets = function (targets) {
        return this.checkValueInTargets(targets, function (v) {
            return v > 0;
        });
    };
    c3_chart_internal_fn.isOrderDesc = function () {
        var config = this.config;
        return typeof config.data_order === 'string' && config.data_order.toLowerCase() === 'desc';
    };
    c3_chart_internal_fn.isOrderAsc = function () {
        var config = this.config;
        return typeof config.data_order === 'string' && config.data_order.toLowerCase() === 'asc';
    };
    c3_chart_internal_fn.getOrderFunction = function () {
        var $$ = this,
            config = $$.config,
            orderAsc = $$.isOrderAsc(),
            orderDesc = $$.isOrderDesc();
        if (orderAsc || orderDesc) {
            var reducer = function reducer(p, c) {
                return p + Math.abs(c.value);
            };
            return function (t1, t2) {
                var t1Sum = t1.values.reduce(reducer, 0),
                    t2Sum = t2.values.reduce(reducer, 0);
                return orderAsc ? t2Sum - t1Sum : t1Sum - t2Sum;
            };
        } else if (isFunction(config.data_order)) {
            return config.data_order;
        } else if (isArray(config.data_order)) {
            var order = config.data_order;
            return function (t1, t2) {
                return order.indexOf(t1.id) - order.indexOf(t2.id);
            };
        }
    };
    c3_chart_internal_fn.orderTargets = function (targets) {
        var fct = this.getOrderFunction();
        if (fct) {
            targets.sort(fct);
        }
        return targets;
    };
    c3_chart_internal_fn.filterByX = function (targets, x) {
        return this.d3.merge(targets.map(function (t) {
            return t.values;
        })).filter(function (v) {
            return v.x - x === 0;
        });
    };
    c3_chart_internal_fn.filterRemoveNull = function (data) {
        return data.filter(function (d) {
            return isValue(d.value);
        });
    };
    c3_chart_internal_fn.filterByXDomain = function (targets, xDomain) {
        return targets.map(function (t) {
            return {
                id: t.id,
                id_org: t.id_org,
                values: t.values.filter(function (v) {
                    return xDomain[0] <= v.x && v.x <= xDomain[1];
                })
            };
        });
    };
    c3_chart_internal_fn.hasDataLabel = function () {
        var config = this.config;
        if (typeof config.data_labels === 'boolean' && config.data_labels) {
            return true;
        } else if (_typeof(config.data_labels) === 'object' && notEmpty(config.data_labels)) {
            return true;
        }
        return false;
    };
    c3_chart_internal_fn.getDataLabelLength = function (min, max, key) {
        var $$ = this,
            lengths = [0, 0],
            paddingCoef = 1.3;
        $$.selectChart.select('svg').selectAll('.dummy').data([min, max]).enter().append('text').text(function (d) {
            return $$.dataLabelFormat(d.id)(d);
        }).each(function (d, i) {
            lengths[i] = this.getBoundingClientRect()[key] * paddingCoef;
        }).remove();
        return lengths;
    };
    c3_chart_internal_fn.isNoneArc = function (d) {
        return this.hasTarget(this.data.targets, d.id);
    }, c3_chart_internal_fn.isArc = function (d) {
        return 'data' in d && this.hasTarget(this.data.targets, d.data.id);
    };
    c3_chart_internal_fn.findClosestFromTargets = function (targets, pos) {
        var $$ = this,
            candidates;

        // map to array of closest points of each target
        candidates = targets.map(function (target) {
            return $$.findClosest(target.values, pos);
        });

        // decide closest point and return
        return $$.findClosest(candidates, pos);
    };
    c3_chart_internal_fn.findClosest = function (values, pos) {
        var $$ = this,
            minDist = $$.config.point_sensitivity,
            closest;

        // find mouseovering bar
        values.filter(function (v) {
            return v && $$.isBarType(v.id);
        }).forEach(function (v) {
            var shape = $$.main.select('.' + CLASS.bars + $$.getTargetSelectorSuffix(v.id) + ' .' + CLASS.bar + '-' + v.index).node();
            if (!closest && $$.isWithinBar($$.d3.mouse(shape), shape)) {
                closest = v;
            }
        });

        // find closest point from non-bar
        values.filter(function (v) {
            return v && !$$.isBarType(v.id);
        }).forEach(function (v) {
            var d = $$.dist(v, pos);
            if (d < minDist) {
                minDist = d;
                closest = v;
            }
        });

        return closest;
    };
    c3_chart_internal_fn.dist = function (data, pos) {
        var $$ = this,
            config = $$.config,
            xIndex = config.axis_rotated ? 1 : 0,
            yIndex = config.axis_rotated ? 0 : 1,
            y = $$.circleY(data, data.index),
            x = $$.x(data.x);
        return Math.sqrt(Math.pow(x - pos[xIndex], 2) + Math.pow(y - pos[yIndex], 2));
    };
    c3_chart_internal_fn.convertValuesToStep = function (values) {
        var converted = [].concat(values),
            i;

        if (!this.isCategorized()) {
            return values;
        }

        for (i = values.length + 1; 0 < i; i--) {
            converted[i] = converted[i - 1];
        }

        converted[0] = {
            x: converted[0].x - 1,
            value: converted[0].value,
            id: converted[0].id
        };
        converted[values.length + 1] = {
            x: converted[values.length].x + 1,
            value: converted[values.length].value,
            id: converted[values.length].id
        };

        return converted;
    };
    c3_chart_internal_fn.updateDataAttributes = function (name, attrs) {
        var $$ = this,
            config = $$.config,
            current = config['data_' + name];
        if (typeof attrs === 'undefined') {
            return current;
        }
        Object.keys(attrs).forEach(function (id) {
            current[id] = attrs[id];
        });
        $$.redraw({ withLegend: true });
        return current;
    };

    c3_chart_internal_fn.load = function (targets, args) {
        var $$ = this;
        if (targets) {
            // filter loading targets if needed
            if (args.filter) {
                targets = targets.filter(args.filter);
            }
            // set type if args.types || args.type specified
            if (args.type || args.types) {
                targets.forEach(function (t) {
                    var type = args.types && args.types[t.id] ? args.types[t.id] : args.type;
                    $$.setTargetType(t.id, type);
                });
            }
            // Update/Add data
            $$.data.targets.forEach(function (d) {
                for (var i = 0; i < targets.length; i++) {
                    if (d.id === targets[i].id) {
                        d.values = targets[i].values;
                        targets.splice(i, 1);
                        break;
                    }
                }
            });
            $$.data.targets = $$.data.targets.concat(targets); // add remained
        }

        // Set targets
        $$.updateTargets($$.data.targets);

        // Redraw with new targets
        $$.redraw({ withUpdateOrgXDomain: true, withUpdateXDomain: true, withLegend: true });

        if (args.done) {
            args.done();
        }
    };
    c3_chart_internal_fn.loadFromArgs = function (args) {
        var $$ = this;
        if (args.data) {
            $$.load($$.convertDataToTargets(args.data), args);
        } else if (args.url) {
            $$.convertUrlToData(args.url, args.mimeType, args.headers, args.keys, function (data) {
                $$.load($$.convertDataToTargets(data), args);
            });
        } else if (args.json) {
            $$.load($$.convertDataToTargets($$.convertJsonToData(args.json, args.keys)), args);
        } else if (args.rows) {
            $$.load($$.convertDataToTargets($$.convertRowsToData(args.rows)), args);
        } else if (args.columns) {
            $$.load($$.convertDataToTargets($$.convertColumnsToData(args.columns)), args);
        } else {
            $$.load(null, args);
        }
    };
    c3_chart_internal_fn.unload = function (targetIds, done) {
        var $$ = this;
        if (!done) {
            done = function done() {};
        }
        // filter existing target
        targetIds = targetIds.filter(function (id) {
            return $$.hasTarget($$.data.targets, id);
        });
        // If no target, call done and return
        if (!targetIds || targetIds.length === 0) {
            done();
            return;
        }
        $$.svg.selectAll(targetIds.map(function (id) {
            return $$.selectorTarget(id);
        })).transition().style('opacity', 0).remove().call($$.endall, done);
        targetIds.forEach(function (id) {
            // Reset fadein for future load
            $$.withoutFadeIn[id] = false;
            // Remove target's elements
            if ($$.legend) {
                $$.legend.selectAll('.' + CLASS.legendItem + $$.getTargetSelectorSuffix(id)).remove();
            }
            // Remove target
            $$.data.targets = $$.data.targets.filter(function (t) {
                return t.id !== id;
            });
        });
    };

    c3_chart_internal_fn.getYDomainMin = function (targets) {
        var $$ = this,
            config = $$.config,
            ids = $$.mapToIds(targets),
            ys = $$.getValuesAsIdKeyed(targets),
            j,
            k,
            baseId,
            idsInGroup,
            id,
            hasNegativeValue;
        if (config.data_groups.length > 0) {
            hasNegativeValue = $$.hasNegativeValueInTargets(targets);
            for (j = 0; j < config.data_groups.length; j++) {
                // Determine baseId
                idsInGroup = config.data_groups[j].filter(function (id) {
                    return ids.indexOf(id) >= 0;
                });
                if (idsInGroup.length === 0) {
                    continue;
                }
                baseId = idsInGroup[0];
                // Consider negative values
                if (hasNegativeValue && ys[baseId]) {
                    ys[baseId].forEach(function (v, i) {
                        ys[baseId][i] = v < 0 ? v : 0;
                    });
                }
                // Compute min
                for (k = 1; k < idsInGroup.length; k++) {
                    id = idsInGroup[k];
                    if (!ys[id]) {
                        continue;
                    }
                    ys[id].forEach(function (v, i) {
                        if ($$.axis.getId(id) === $$.axis.getId(baseId) && ys[baseId] && !(hasNegativeValue && +v > 0)) {
                            ys[baseId][i] += +v;
                        }
                    });
                }
            }
        }
        return $$.d3.min(Object.keys(ys).map(function (key) {
            return $$.d3.min(ys[key]);
        }));
    };
    c3_chart_internal_fn.getYDomainMax = function (targets) {
        var $$ = this,
            config = $$.config,
            ids = $$.mapToIds(targets),
            ys = $$.getValuesAsIdKeyed(targets),
            j,
            k,
            baseId,
            idsInGroup,
            id,
            hasPositiveValue;
        if (config.data_groups.length > 0) {
            hasPositiveValue = $$.hasPositiveValueInTargets(targets);
            for (j = 0; j < config.data_groups.length; j++) {
                // Determine baseId
                idsInGroup = config.data_groups[j].filter(function (id) {
                    return ids.indexOf(id) >= 0;
                });
                if (idsInGroup.length === 0) {
                    continue;
                }
                baseId = idsInGroup[0];
                // Consider positive values
                if (hasPositiveValue && ys[baseId]) {
                    ys[baseId].forEach(function (v, i) {
                        ys[baseId][i] = v > 0 ? v : 0;
                    });
                }
                // Compute max
                for (k = 1; k < idsInGroup.length; k++) {
                    id = idsInGroup[k];
                    if (!ys[id]) {
                        continue;
                    }
                    ys[id].forEach(function (v, i) {
                        if ($$.axis.getId(id) === $$.axis.getId(baseId) && ys[baseId] && !(hasPositiveValue && +v < 0)) {
                            ys[baseId][i] += +v;
                        }
                    });
                }
            }
        }
        return $$.d3.max(Object.keys(ys).map(function (key) {
            return $$.d3.max(ys[key]);
        }));
    };
    c3_chart_internal_fn.getYDomain = function (targets, axisId, xDomain) {
        var $$ = this,
            config = $$.config,
            targetsByAxisId = targets.filter(function (t) {
            return $$.axis.getId(t.id) === axisId;
        }),
            yTargets = xDomain ? $$.filterByXDomain(targetsByAxisId, xDomain) : targetsByAxisId,
            yMin = axisId === 'y2' ? config.axis_y2_min : config.axis_y_min,
            yMax = axisId === 'y2' ? config.axis_y2_max : config.axis_y_max,
            yDomainMin = $$.getYDomainMin(yTargets),
            yDomainMax = $$.getYDomainMax(yTargets),
            domain,
            domainLength,
            padding,
            padding_top,
            padding_bottom,
            center = axisId === 'y2' ? config.axis_y2_center : config.axis_y_center,
            yDomainAbs,
            lengths,
            diff,
            ratio,
            isAllPositive,
            isAllNegative,
            isZeroBased = $$.hasType('bar', yTargets) && config.bar_zerobased || $$.hasType('area', yTargets) && config.area_zerobased,
            isInverted = axisId === 'y2' ? config.axis_y2_inverted : config.axis_y_inverted,
            showHorizontalDataLabel = $$.hasDataLabel() && config.axis_rotated,
            showVerticalDataLabel = $$.hasDataLabel() && !config.axis_rotated;

        // MEMO: avoid inverting domain unexpectedly
        yDomainMin = isValue(yMin) ? yMin : isValue(yMax) ? yDomainMin < yMax ? yDomainMin : yMax - 10 : yDomainMin;
        yDomainMax = isValue(yMax) ? yMax : isValue(yMin) ? yMin < yDomainMax ? yDomainMax : yMin + 10 : yDomainMax;

        if (yTargets.length === 0) {
            // use current domain if target of axisId is none
            return axisId === 'y2' ? $$.y2.domain() : $$.y.domain();
        }
        if (isNaN(yDomainMin)) {
            // set minimum to zero when not number
            yDomainMin = 0;
        }
        if (isNaN(yDomainMax)) {
            // set maximum to have same value as yDomainMin
            yDomainMax = yDomainMin;
        }
        if (yDomainMin === yDomainMax) {
            yDomainMin < 0 ? yDomainMax = 0 : yDomainMin = 0;
        }
        isAllPositive = yDomainMin >= 0 && yDomainMax >= 0;
        isAllNegative = yDomainMin <= 0 && yDomainMax <= 0;

        // Cancel zerobased if axis_*_min / axis_*_max specified
        if (isValue(yMin) && isAllPositive || isValue(yMax) && isAllNegative) {
            isZeroBased = false;
        }

        // Bar/Area chart should be 0-based if all positive|negative
        if (isZeroBased) {
            if (isAllPositive) {
                yDomainMin = 0;
            }
            if (isAllNegative) {
                yDomainMax = 0;
            }
        }

        domainLength = Math.abs(yDomainMax - yDomainMin);
        padding = padding_top = padding_bottom = domainLength * 0.1;

        if (typeof center !== 'undefined') {
            yDomainAbs = Math.max(Math.abs(yDomainMin), Math.abs(yDomainMax));
            yDomainMax = center + yDomainAbs;
            yDomainMin = center - yDomainAbs;
        }
        // add padding for data label
        if (showHorizontalDataLabel) {
            lengths = $$.getDataLabelLength(yDomainMin, yDomainMax, 'width');
            diff = diffDomain($$.y.range());
            ratio = [lengths[0] / diff, lengths[1] / diff];
            padding_top += domainLength * (ratio[1] / (1 - ratio[0] - ratio[1]));
            padding_bottom += domainLength * (ratio[0] / (1 - ratio[0] - ratio[1]));
        } else if (showVerticalDataLabel) {
            lengths = $$.getDataLabelLength(yDomainMin, yDomainMax, 'height');
            padding_top += $$.axis.convertPixelsToAxisPadding(lengths[1], domainLength);
            padding_bottom += $$.axis.convertPixelsToAxisPadding(lengths[0], domainLength);
        }
        if (axisId === 'y' && notEmpty(config.axis_y_padding)) {
            padding_top = $$.axis.getPadding(config.axis_y_padding, 'top', padding_top, domainLength);
            padding_bottom = $$.axis.getPadding(config.axis_y_padding, 'bottom', padding_bottom, domainLength);
        }
        if (axisId === 'y2' && notEmpty(config.axis_y2_padding)) {
            padding_top = $$.axis.getPadding(config.axis_y2_padding, 'top', padding_top, domainLength);
            padding_bottom = $$.axis.getPadding(config.axis_y2_padding, 'bottom', padding_bottom, domainLength);
        }
        // Bar/Area chart should be 0-based if all positive|negative
        if (isZeroBased) {
            if (isAllPositive) {
                padding_bottom = yDomainMin;
            }
            if (isAllNegative) {
                padding_top = -yDomainMax;
            }
        }
        domain = [yDomainMin - padding_bottom, yDomainMax + padding_top];
        return isInverted ? domain.reverse() : domain;
    };
    c3_chart_internal_fn.getXDomainMin = function (targets) {
        var $$ = this,
            config = $$.config;
        return isDefined(config.axis_x_min) ? $$.isTimeSeries() ? this.parseDate(config.axis_x_min) : config.axis_x_min : $$.d3.min(targets, function (t) {
            return $$.d3.min(t.values, function (v) {
                return v.x;
            });
        });
    };
    c3_chart_internal_fn.getXDomainMax = function (targets) {
        var $$ = this,
            config = $$.config;
        return isDefined(config.axis_x_max) ? $$.isTimeSeries() ? this.parseDate(config.axis_x_max) : config.axis_x_max : $$.d3.max(targets, function (t) {
            return $$.d3.max(t.values, function (v) {
                return v.x;
            });
        });
    };
    c3_chart_internal_fn.getXDomainPadding = function (domain) {
        var $$ = this,
            config = $$.config,
            diff = domain[1] - domain[0],
            maxDataCount,
            padding,
            paddingLeft,
            paddingRight;
        if ($$.isCategorized()) {
            padding = 0;
        } else if ($$.hasType('bar')) {
            maxDataCount = $$.getMaxDataCount();
            padding = maxDataCount > 1 ? diff / (maxDataCount - 1) / 2 : 0.5;
        } else {
            padding = diff * 0.01;
        }
        if (_typeof(config.axis_x_padding) === 'object' && notEmpty(config.axis_x_padding)) {
            paddingLeft = isValue(config.axis_x_padding.left) ? config.axis_x_padding.left : padding;
            paddingRight = isValue(config.axis_x_padding.right) ? config.axis_x_padding.right : padding;
        } else if (typeof config.axis_x_padding === 'number') {
            paddingLeft = paddingRight = config.axis_x_padding;
        } else {
            paddingLeft = paddingRight = padding;
        }
        return { left: paddingLeft, right: paddingRight };
    };
    c3_chart_internal_fn.getXDomain = function (targets) {
        var $$ = this,
            xDomain = [$$.getXDomainMin(targets), $$.getXDomainMax(targets)],
            firstX = xDomain[0],
            lastX = xDomain[1],
            padding = $$.getXDomainPadding(xDomain),
            min = 0,
            max = 0;
        // show center of x domain if min and max are the same
        if (firstX - lastX === 0 && !$$.isCategorized()) {
            if ($$.isTimeSeries()) {
                firstX = new Date(firstX.getTime() * 0.5);
                lastX = new Date(lastX.getTime() * 1.5);
            } else {
                firstX = firstX === 0 ? 1 : firstX * 0.5;
                lastX = lastX === 0 ? -1 : lastX * 1.5;
            }
        }
        if (firstX || firstX === 0) {
            min = $$.isTimeSeries() ? new Date(firstX.getTime() - padding.left) : firstX - padding.left;
        }
        if (lastX || lastX === 0) {
            max = $$.isTimeSeries() ? new Date(lastX.getTime() + padding.right) : lastX + padding.right;
        }
        return [min, max];
    };
    c3_chart_internal_fn.updateXDomain = function (targets, withUpdateXDomain, withUpdateOrgXDomain, withTrim, domain) {
        var $$ = this,
            config = $$.config;

        if (withUpdateOrgXDomain) {
            $$.x.domain(domain ? domain : $$.d3.extent($$.getXDomain(targets)));
            $$.orgXDomain = $$.x.domain();
            if (config.zoom_enabled) {
                $$.zoom.update();
            }
            $$.subX.domain($$.x.domain());
            if ($$.brush) {
                $$.brush.updateScale($$.subX);
            }
        }
        if (withUpdateXDomain) {
            $$.x.domain(domain ? domain : !$$.brush || $$.brush.empty() ? $$.orgXDomain : $$.brush.selectionAsValue());
        }

        // Trim domain when too big by zoom mousemove event
        if (withTrim) {
            $$.x.domain($$.trimXDomain($$.x.orgDomain()));
        }

        return $$.x.domain();
    };
    c3_chart_internal_fn.trimXDomain = function (domain) {
        var zoomDomain = this.getZoomDomain(),
            min = zoomDomain[0],
            max = zoomDomain[1];
        if (domain[0] <= min) {
            domain[1] = +domain[1] + (min - domain[0]);
            domain[0] = min;
        }
        if (max <= domain[1]) {
            domain[0] = +domain[0] - (domain[1] - max);
            domain[1] = max;
        }
        return domain;
    };

    c3_chart_internal_fn.drag = function (mouse) {
        var $$ = this,
            config = $$.config,
            main = $$.main,
            d3 = $$.d3;
        var sx, sy, mx, my, minX, maxX, minY, maxY;

        if ($$.hasArcType()) {
            return;
        }
        if (!config.data_selection_enabled) {
            return;
        } // do nothing if not selectable
        if (!config.data_selection_multiple) {
            return;
        } // skip when single selection because drag is used for multiple selection

        sx = $$.dragStart[0];
        sy = $$.dragStart[1];
        mx = mouse[0];
        my = mouse[1];
        minX = Math.min(sx, mx);
        maxX = Math.max(sx, mx);
        minY = config.data_selection_grouped ? $$.margin.top : Math.min(sy, my);
        maxY = config.data_selection_grouped ? $$.height : Math.max(sy, my);

        main.select('.' + CLASS.dragarea).attr('x', minX).attr('y', minY).attr('width', maxX - minX).attr('height', maxY - minY);
        // TODO: binary search when multiple xs
        main.selectAll('.' + CLASS.shapes).selectAll('.' + CLASS.shape).filter(function (d) {
            return config.data_selection_isselectable(d);
        }).each(function (d, i) {
            var shape = d3.select(this),
                isSelected = shape.classed(CLASS.SELECTED),
                isIncluded = shape.classed(CLASS.INCLUDED),
                _x,
                _y,
                _w,
                _h,
                toggle,
                isWithin = false,
                box;
            if (shape.classed(CLASS.circle)) {
                _x = shape.attr("cx") * 1;
                _y = shape.attr("cy") * 1;
                toggle = $$.togglePoint;
                isWithin = minX < _x && _x < maxX && minY < _y && _y < maxY;
            } else if (shape.classed(CLASS.bar)) {
                box = getPathBox(this);
                _x = box.x;
                _y = box.y;
                _w = box.width;
                _h = box.height;
                toggle = $$.togglePath;
                isWithin = !(maxX < _x || _x + _w < minX) && !(maxY < _y || _y + _h < minY);
            } else {
                // line/area selection not supported yet
                return;
            }
            if (isWithin ^ isIncluded) {
                shape.classed(CLASS.INCLUDED, !isIncluded);
                // TODO: included/unincluded callback here
                shape.classed(CLASS.SELECTED, !isSelected);
                toggle.call($$, !isSelected, shape, d, i);
            }
        });
    };

    c3_chart_internal_fn.dragstart = function (mouse) {
        var $$ = this,
            config = $$.config;
        if ($$.hasArcType()) {
            return;
        }
        if (!config.data_selection_enabled) {
            return;
        } // do nothing if not selectable
        $$.dragStart = mouse;
        $$.main.select('.' + CLASS.chart).append('rect').attr('class', CLASS.dragarea).style('opacity', 0.1);
        $$.dragging = true;
    };

    c3_chart_internal_fn.dragend = function () {
        var $$ = this,
            config = $$.config;
        if ($$.hasArcType()) {
            return;
        }
        if (!config.data_selection_enabled) {
            return;
        } // do nothing if not selectable
        $$.main.select('.' + CLASS.dragarea).transition().duration(100).style('opacity', 0).remove();
        $$.main.selectAll('.' + CLASS.shape).classed(CLASS.INCLUDED, false);
        $$.dragging = false;
    };

    c3_chart_internal_fn.getYFormat = function (forArc) {
        var $$ = this,
            formatForY = forArc && !$$.hasType('gauge') ? $$.defaultArcValueFormat : $$.yFormat,
            formatForY2 = forArc && !$$.hasType('gauge') ? $$.defaultArcValueFormat : $$.y2Format;
        return function (v, ratio, id) {
            var format = $$.axis.getId(id) === 'y2' ? formatForY2 : formatForY;
            return format.call($$, v, ratio);
        };
    };
    c3_chart_internal_fn.yFormat = function (v) {
        var $$ = this,
            config = $$.config,
            format = config.axis_y_tick_format ? config.axis_y_tick_format : $$.defaultValueFormat;
        return format(v);
    };
    c3_chart_internal_fn.y2Format = function (v) {
        var $$ = this,
            config = $$.config,
            format = config.axis_y2_tick_format ? config.axis_y2_tick_format : $$.defaultValueFormat;
        return format(v);
    };
    c3_chart_internal_fn.defaultValueFormat = function (v) {
        return isValue(v) ? +v : "";
    };
    c3_chart_internal_fn.defaultArcValueFormat = function (v, ratio) {
        return (ratio * 100).toFixed(1) + '%';
    };
    c3_chart_internal_fn.dataLabelFormat = function (targetId) {
        var $$ = this,
            data_labels = $$.config.data_labels,
            format,
            defaultFormat = function defaultFormat(v) {
            return isValue(v) ? +v : "";
        };
        // find format according to axis id
        if (typeof data_labels.format === 'function') {
            format = data_labels.format;
        } else if (_typeof(data_labels.format) === 'object') {
            if (data_labels.format[targetId]) {
                format = data_labels.format[targetId] === true ? defaultFormat : data_labels.format[targetId];
            } else {
                format = function format() {
                    return '';
                };
            }
        } else {
            format = defaultFormat;
        }
        return format;
    };

    c3_chart_internal_fn.initGrid = function () {
        var $$ = this,
            config = $$.config,
            d3 = $$.d3;
        $$.grid = $$.main.append('g').attr("clip-path", $$.clipPathForGrid).attr('class', CLASS.grid);
        if (config.grid_x_show) {
            $$.grid.append("g").attr("class", CLASS.xgrids);
        }
        if (config.grid_y_show) {
            $$.grid.append('g').attr('class', CLASS.ygrids);
        }
        if (config.grid_focus_show) {
            $$.grid.append('g').attr("class", CLASS.xgridFocus).append('line').attr('class', CLASS.xgridFocus);
        }
        $$.xgrid = d3.selectAll([]);
        if (!config.grid_lines_front) {
            $$.initGridLines();
        }
    };
    c3_chart_internal_fn.initGridLines = function () {
        var $$ = this,
            d3 = $$.d3;
        $$.gridLines = $$.main.append('g').attr("clip-path", $$.clipPathForGrid).attr('class', CLASS.grid + ' ' + CLASS.gridLines);
        $$.gridLines.append('g').attr("class", CLASS.xgridLines);
        $$.gridLines.append('g').attr('class', CLASS.ygridLines);
        $$.xgridLines = d3.selectAll([]);
    };
    c3_chart_internal_fn.updateXGrid = function (withoutUpdate) {
        var $$ = this,
            config = $$.config,
            d3 = $$.d3,
            xgridData = $$.generateGridData(config.grid_x_type, $$.x),
            tickOffset = $$.isCategorized() ? $$.xAxis.tickOffset() : 0;

        $$.xgridAttr = config.axis_rotated ? {
            'x1': 0,
            'x2': $$.width,
            'y1': function y1(d) {
                return $$.x(d) - tickOffset;
            },
            'y2': function y2(d) {
                return $$.x(d) - tickOffset;
            }
        } : {
            'x1': function x1(d) {
                return $$.x(d) + tickOffset;
            },
            'x2': function x2(d) {
                return $$.x(d) + tickOffset;
            },
            'y1': 0,
            'y2': $$.height
        };
        $$.xgridAttr.opacity = function () {
            var pos = +d3.select(this).attr(config.axis_rotated ? 'y1' : 'x1');
            return pos === (config.axis_rotated ? $$.height : 0) ? 0 : 1;
        };

        var xgrid = $$.main.select('.' + CLASS.xgrids).selectAll('.' + CLASS.xgrid).data(xgridData);
        var xgridEnter = xgrid.enter().append('line').attr("class", CLASS.xgrid).attr('x1', $$.xgridAttr.x1).attr('x2', $$.xgridAttr.x2).attr('y1', $$.xgridAttr.y1).attr('y2', $$.xgridAttr.y2).style("opacity", 0);
        $$.xgrid = xgridEnter.merge(xgrid);
        if (!withoutUpdate) {
            $$.xgrid.attr('x1', $$.xgridAttr.x1).attr('x2', $$.xgridAttr.x2).attr('y1', $$.xgridAttr.y1).attr('y2', $$.xgridAttr.y2).style("opacity", $$.xgridAttr.opacity);
        }
        xgrid.exit().remove();
    };

    c3_chart_internal_fn.updateYGrid = function () {
        var $$ = this,
            config = $$.config,
            gridValues = $$.yAxis.tickValues() || $$.y.ticks(config.grid_y_ticks);
        var ygrid = $$.main.select('.' + CLASS.ygrids).selectAll('.' + CLASS.ygrid).data(gridValues);
        var ygridEnter = ygrid.enter().append('line')
        // TODO: x1, x2, y1, y2, opacity need to be set here maybe
        .attr('class', CLASS.ygrid);
        $$.ygrid = ygridEnter.merge(ygrid);
        $$.ygrid.attr("x1", config.axis_rotated ? $$.y : 0).attr("x2", config.axis_rotated ? $$.y : $$.width).attr("y1", config.axis_rotated ? 0 : $$.y).attr("y2", config.axis_rotated ? $$.height : $$.y);
        ygrid.exit().remove();
        $$.smoothLines($$.ygrid, 'grid');
    };

    c3_chart_internal_fn.gridTextAnchor = function (d) {
        return d.position ? d.position : "end";
    };
    c3_chart_internal_fn.gridTextDx = function (d) {
        return d.position === 'start' ? 4 : d.position === 'middle' ? 0 : -4;
    };
    c3_chart_internal_fn.xGridTextX = function (d) {
        return d.position === 'start' ? -this.height : d.position === 'middle' ? -this.height / 2 : 0;
    };
    c3_chart_internal_fn.yGridTextX = function (d) {
        return d.position === 'start' ? 0 : d.position === 'middle' ? this.width / 2 : this.width;
    };
    c3_chart_internal_fn.updateGrid = function (duration) {
        var $$ = this,
            main = $$.main,
            config = $$.config,
            xgridLine,
            xgridLineEnter,
            ygridLine,
            ygridLineEnter,
            xv = $$.xv.bind($$),
            yv = $$.yv.bind($$),
            xGridTextX = $$.xGridTextX.bind($$),
            yGridTextX = $$.yGridTextX.bind($$);

        // hide if arc type
        $$.grid.style('visibility', $$.hasArcType() ? 'hidden' : 'visible');

        main.select('line.' + CLASS.xgridFocus).style("visibility", "hidden");
        if (config.grid_x_show) {
            $$.updateXGrid();
        }
        xgridLine = main.select('.' + CLASS.xgridLines).selectAll('.' + CLASS.xgridLine).data(config.grid_x_lines);
        // enter
        xgridLineEnter = xgridLine.enter().append('g').attr("class", function (d) {
            return CLASS.xgridLine + (d['class'] ? ' ' + d['class'] : '');
        });
        xgridLineEnter.append('line').attr("x1", config.axis_rotated ? 0 : xv).attr("x2", config.axis_rotated ? $$.width : xv).attr("y1", config.axis_rotated ? xv : 0).attr("y2", config.axis_rotated ? xv : $$.height).style("opacity", 0);
        xgridLineEnter.append('text').attr("text-anchor", $$.gridTextAnchor).attr("transform", config.axis_rotated ? "" : "rotate(-90)").attr("x", config.axis_rotated ? yGridTextX : xGridTextX).attr("y", xv).attr('dx', $$.gridTextDx).attr('dy', -5).style("opacity", 0);
        // udpate
        $$.xgridLines = xgridLineEnter.merge(xgridLine);
        // done in d3.transition() of the end of this function
        // exit
        xgridLine.exit().transition().duration(duration).style("opacity", 0).remove();

        // Y-Grid
        if (config.grid_y_show) {
            $$.updateYGrid();
        }
        ygridLine = main.select('.' + CLASS.ygridLines).selectAll('.' + CLASS.ygridLine).data(config.grid_y_lines);
        // enter
        ygridLineEnter = ygridLine.enter().append('g').attr("class", function (d) {
            return CLASS.ygridLine + (d['class'] ? ' ' + d['class'] : '');
        });
        ygridLineEnter.append('line').attr("x1", config.axis_rotated ? yv : 0).attr("x2", config.axis_rotated ? yv : $$.width).attr("y1", config.axis_rotated ? 0 : yv).attr("y2", config.axis_rotated ? $$.height : yv).style("opacity", 0);
        ygridLineEnter.append('text').attr("text-anchor", $$.gridTextAnchor).attr("transform", config.axis_rotated ? "rotate(-90)" : "").attr("x", config.axis_rotated ? xGridTextX : yGridTextX).attr("y", yv).attr('dx', $$.gridTextDx).attr('dy', -5).style("opacity", 0);
        // update
        $$.ygridLines = ygridLineEnter.merge(ygridLine);
        $$.ygridLines.select('line').transition().duration(duration).attr("x1", config.axis_rotated ? yv : 0).attr("x2", config.axis_rotated ? yv : $$.width).attr("y1", config.axis_rotated ? 0 : yv).attr("y2", config.axis_rotated ? $$.height : yv).style("opacity", 1);
        $$.ygridLines.select('text').transition().duration(duration).attr("x", config.axis_rotated ? $$.xGridTextX.bind($$) : $$.yGridTextX.bind($$)).attr("y", yv).text(function (d) {
            return d.text;
        }).style("opacity", 1);
        // exit
        ygridLine.exit().transition().duration(duration).style("opacity", 0).remove();
    };
    c3_chart_internal_fn.redrawGrid = function (withTransition, transition) {
        var $$ = this,
            config = $$.config,
            xv = $$.xv.bind($$),
            lines = $$.xgridLines.select('line'),
            texts = $$.xgridLines.select('text');
        return [(withTransition ? lines.transition(transition) : lines).attr("x1", config.axis_rotated ? 0 : xv).attr("x2", config.axis_rotated ? $$.width : xv).attr("y1", config.axis_rotated ? xv : 0).attr("y2", config.axis_rotated ? xv : $$.height).style("opacity", 1), (withTransition ? texts.transition(transition) : texts).attr("x", config.axis_rotated ? $$.yGridTextX.bind($$) : $$.xGridTextX.bind($$)).attr("y", xv).text(function (d) {
            return d.text;
        }).style("opacity", 1)];
    };
    c3_chart_internal_fn.showXGridFocus = function (selectedData) {
        var $$ = this,
            config = $$.config,
            dataToShow = selectedData.filter(function (d) {
            return d && isValue(d.value);
        }),
            focusEl = $$.main.selectAll('line.' + CLASS.xgridFocus),
            xx = $$.xx.bind($$);
        if (!config.tooltip_show) {
            return;
        }
        // Hide when scatter plot exists
        if ($$.hasType('scatter') || $$.hasArcType()) {
            return;
        }
        focusEl.style("visibility", "visible").data([dataToShow[0]]).attr(config.axis_rotated ? 'y1' : 'x1', xx).attr(config.axis_rotated ? 'y2' : 'x2', xx);
        $$.smoothLines(focusEl, 'grid');
    };
    c3_chart_internal_fn.hideXGridFocus = function () {
        this.main.select('line.' + CLASS.xgridFocus).style("visibility", "hidden");
    };
    c3_chart_internal_fn.updateXgridFocus = function () {
        var $$ = this,
            config = $$.config;
        $$.main.select('line.' + CLASS.xgridFocus).attr("x1", config.axis_rotated ? 0 : -10).attr("x2", config.axis_rotated ? $$.width : -10).attr("y1", config.axis_rotated ? -10 : 0).attr("y2", config.axis_rotated ? -10 : $$.height);
    };
    c3_chart_internal_fn.generateGridData = function (type, scale) {
        var $$ = this,
            gridData = [],
            xDomain,
            firstYear,
            lastYear,
            i,
            tickNum = $$.main.select("." + CLASS.axisX).selectAll('.tick').size();
        if (type === 'year') {
            xDomain = $$.getXDomain();
            firstYear = xDomain[0].getFullYear();
            lastYear = xDomain[1].getFullYear();
            for (i = firstYear; i <= lastYear; i++) {
                gridData.push(new Date(i + '-01-01 00:00:00'));
            }
        } else {
            gridData = scale.ticks(10);
            if (gridData.length > tickNum) {
                // use only int
                gridData = gridData.filter(function (d) {
                    return ("" + d).indexOf('.') < 0;
                });
            }
        }
        return gridData;
    };
    c3_chart_internal_fn.getGridFilterToRemove = function (params) {
        return params ? function (line) {
            var found = false;
            [].concat(params).forEach(function (param) {
                if ('value' in param && line.value === param.value || 'class' in param && line['class'] === param['class']) {
                    found = true;
                }
            });
            return found;
        } : function () {
            return true;
        };
    };
    c3_chart_internal_fn.removeGridLines = function (params, forX) {
        var $$ = this,
            config = $$.config,
            toRemove = $$.getGridFilterToRemove(params),
            toShow = function toShow(line) {
            return !toRemove(line);
        },
            classLines = forX ? CLASS.xgridLines : CLASS.ygridLines,
            classLine = forX ? CLASS.xgridLine : CLASS.ygridLine;
        $$.main.select('.' + classLines).selectAll('.' + classLine).filter(toRemove).transition().duration(config.transition_duration).style('opacity', 0).remove();
        if (forX) {
            config.grid_x_lines = config.grid_x_lines.filter(toShow);
        } else {
            config.grid_y_lines = config.grid_y_lines.filter(toShow);
        }
    };

    c3_chart_internal_fn.initEventRect = function () {
        var $$ = this,
            config = $$.config;

        $$.main.select('.' + CLASS.chart).append("g").attr("class", CLASS.eventRects).style('fill-opacity', 0);
        $$.eventRect = $$.main.select('.' + CLASS.eventRects).append('rect').attr('class', CLASS.eventRect);

        // event rect handle zoom event as well
        if (config.zoom_enabled && $$.zoom) {
            $$.eventRect.call($$.zoom).on("dblclick.zoom", null);
            if (config.zoom_initialRange) {
                // WORKAROUND: Add transition to apply transform immediately when no subchart
                $$.eventRect.transition().duration(0).call($$.zoom.transform, $$.zoomTransform(config.zoom_initialRange));
            }
        }
    };
    c3_chart_internal_fn.redrawEventRect = function () {
        var $$ = this,
            d3 = $$.d3,
            config = $$.config,
            x,
            y,
            w,
            h;

        // TODO: rotated not supported yet
        x = 0;
        y = 0;
        w = $$.width;
        h = $$.height;

        function mouseout() {
            $$.svg.select('.' + CLASS.eventRect).style('cursor', null);
            $$.hideXGridFocus();
            $$.hideTooltip();
            $$.unexpandCircles();
            $$.unexpandBars();
        }

        // rects for mouseover
        $$.main.select('.' + CLASS.eventRects).style('cursor', config.zoom_enabled ? config.axis_rotated ? 'ns-resize' : 'ew-resize' : null);

        $$.eventRect.attr('x', x).attr('y', y).attr('width', w).attr('height', h).on('mouseout', config.interaction_enabled ? function () {
            if (!config) {
                return;
            } // chart is destroyed
            if ($$.hasArcType()) {
                return;
            }
            mouseout();
        } : null).on('mousemove', config.interaction_enabled ? function () {
            var targetsToShow, mouse, closest, sameXData, selectedData;

            if ($$.dragging) {
                return;
            } // do nothing when dragging
            if ($$.hasArcType(targetsToShow)) {
                return;
            }

            targetsToShow = $$.filterTargetsToShow($$.data.targets);
            mouse = d3.mouse(this);
            closest = $$.findClosestFromTargets(targetsToShow, mouse);

            if ($$.mouseover && (!closest || closest.id !== $$.mouseover.id)) {
                config.data_onmouseout.call($$.api, $$.mouseover);
                $$.mouseover = undefined;
            }

            if (!closest) {
                mouseout();
                return;
            }

            if ($$.isScatterType(closest) || !config.tooltip_grouped) {
                sameXData = [closest];
            } else {
                sameXData = $$.filterByX(targetsToShow, closest.x);
            }

            // show tooltip when cursor is close to some point
            selectedData = sameXData.map(function (d) {
                return $$.addName(d);
            });
            $$.showTooltip(selectedData, this);

            // expand points
            if (config.point_focus_expand_enabled) {
                $$.unexpandCircles();
                selectedData.forEach(function (d) {
                    $$.expandCircles(d.index, d.id, false);
                });
            }
            $$.expandBars(closest.index, closest.id, true);

            // Show xgrid focus line
            $$.showXGridFocus(selectedData);

            // Show cursor as pointer if point is close to mouse position
            if ($$.isBarType(closest.id) || $$.dist(closest, mouse) < config.point_sensitivity) {
                $$.svg.select('.' + CLASS.eventRect).style('cursor', 'pointer');
                if (!$$.mouseover) {
                    config.data_onmouseover.call($$.api, closest);
                    $$.mouseover = closest;
                }
            }
        } : null).on('click', config.interaction_enabled ? function () {
            var targetsToShow, mouse, closest, sameXData;
            if ($$.hasArcType(targetsToShow)) {
                return;
            }

            targetsToShow = $$.filterTargetsToShow($$.data.targets);
            mouse = d3.mouse(this);
            closest = $$.findClosestFromTargets(targetsToShow, mouse);
            if (!closest) {
                return;
            }
            // select if selection enabled
            if ($$.isBarType(closest.id) || $$.dist(closest, mouse) < config.point_sensitivity) {
                if ($$.isScatterType(closest) || !config.data_selection_grouped) {
                    sameXData = [closest];
                } else {
                    sameXData = $$.filterByX(targetsToShow, closest.x);
                }
                sameXData.forEach(function (d) {
                    $$.main.selectAll('.' + CLASS.shapes + $$.getTargetSelectorSuffix(d.id)).selectAll('.' + CLASS.shape + '-' + d.index).each(function () {
                        if (config.data_selection_grouped || $$.isWithinShape(this, d)) {
                            $$.toggleShape(this, d, d.index);
                            config.data_onclick.call($$.api, d, this);
                        }
                    });
                });
            }
        } : null).call(config.interaction_enabled && config.data_selection_draggable && $$.drag ? d3.drag().on('drag', function () {
            $$.drag(d3.mouse(this));
        }).on('start', function () {
            $$.dragstart(d3.mouse(this));
        }).on('end', function () {
            $$.dragend();
        }) : function () {});
    };
    c3_chart_internal_fn.getMousePosition = function (data) {
        var $$ = this;
        return [$$.x(data.x), $$.getYScale(data.id)(data.value)];
    };
    c3_chart_internal_fn.dispatchEvent = function (type, mouse) {
        var $$ = this,
            selector = '.' + CLASS.eventRect,
            eventRect = $$.main.select(selector).node(),
            box = eventRect.getBoundingClientRect(),
            x = box.left + (mouse ? mouse[0] : 0),
            y = box.top + (mouse ? mouse[1] : 0),
            event = document.createEvent("MouseEvents");

        event.initMouseEvent(type, true, true, window, 0, x, y, x, y, false, false, false, false, 0, null);
        eventRect.dispatchEvent(event);
    };

    c3_chart_internal_fn.initLegend = function () {
        var $$ = this;
        $$.legendItemTextBox = {};
        $$.legendHasRendered = false;
        $$.legend = $$.svg.append("g").attr("transform", $$.getTranslate('legend'));
        if (!$$.config.legend_show) {
            $$.legend.style('visibility', 'hidden');
            $$.hiddenLegendIds = $$.mapToIds($$.data.targets);
            return;
        }
        // MEMO: call here to update legend box and tranlate for all
        // MEMO: translate will be upated by this, so transform not needed in updateLegend()
        $$.updateLegendWithDefaults();
    };
    c3_chart_internal_fn.updateLegendWithDefaults = function () {
        var $$ = this;
        $$.updateLegend($$.mapToIds($$.data.targets), { withTransform: false, withTransitionForTransform: false, withTransition: false });
    };
    c3_chart_internal_fn.updateSizeForLegend = function (legendHeight, legendWidth) {
        var $$ = this,
            config = $$.config,
            insetLegendPosition = {
            top: $$.isLegendTop ? $$.getCurrentPaddingTop() + config.legend_inset_y + 5.5 : $$.currentHeight - legendHeight - $$.getCurrentPaddingBottom() - config.legend_inset_y,
            left: $$.isLegendLeft ? $$.getCurrentPaddingLeft() + config.legend_inset_x + 0.5 : $$.currentWidth - legendWidth - $$.getCurrentPaddingRight() - config.legend_inset_x + 0.5
        };

        $$.margin3 = {
            top: $$.isLegendRight ? 0 : $$.isLegendInset ? insetLegendPosition.top : $$.currentHeight - legendHeight,
            right: NaN,
            bottom: 0,
            left: $$.isLegendRight ? $$.currentWidth - legendWidth : $$.isLegendInset ? insetLegendPosition.left : 0
        };
    };
    c3_chart_internal_fn.transformLegend = function (withTransition) {
        var $$ = this;
        (withTransition ? $$.legend.transition() : $$.legend).attr("transform", $$.getTranslate('legend'));
    };
    c3_chart_internal_fn.updateLegendStep = function (step) {
        this.legendStep = step;
    };
    c3_chart_internal_fn.updateLegendItemWidth = function (w) {
        this.legendItemWidth = w;
    };
    c3_chart_internal_fn.updateLegendItemHeight = function (h) {
        this.legendItemHeight = h;
    };
    c3_chart_internal_fn.getLegendWidth = function () {
        var $$ = this;
        return $$.config.legend_show ? $$.isLegendRight || $$.isLegendInset ? $$.legendItemWidth * ($$.legendStep + 1) : $$.currentWidth : 0;
    };
    c3_chart_internal_fn.getLegendHeight = function () {
        var $$ = this,
            h = 0;
        if ($$.config.legend_show) {
            if ($$.isLegendRight) {
                h = $$.currentHeight;
            } else {
                h = Math.max(20, $$.legendItemHeight) * ($$.legendStep + 1);
            }
        }
        return h;
    };
    c3_chart_internal_fn.opacityForLegend = function (legendItem) {
        return legendItem.classed(CLASS.legendItemHidden) ? null : 1;
    };
    c3_chart_internal_fn.opacityForUnfocusedLegend = function (legendItem) {
        return legendItem.classed(CLASS.legendItemHidden) ? null : 0.3;
    };
    c3_chart_internal_fn.toggleFocusLegend = function (targetIds, focus) {
        var $$ = this;
        targetIds = $$.mapToTargetIds(targetIds);
        $$.legend.selectAll('.' + CLASS.legendItem).filter(function (id) {
            return targetIds.indexOf(id) >= 0;
        }).classed(CLASS.legendItemFocused, focus).transition().duration(100).style('opacity', function () {
            var opacity = focus ? $$.opacityForLegend : $$.opacityForUnfocusedLegend;
            return opacity.call($$, $$.d3.select(this));
        });
    };
    c3_chart_internal_fn.revertLegend = function () {
        var $$ = this,
            d3 = $$.d3;
        $$.legend.selectAll('.' + CLASS.legendItem).classed(CLASS.legendItemFocused, false).transition().duration(100).style('opacity', function () {
            return $$.opacityForLegend(d3.select(this));
        });
    };
    c3_chart_internal_fn.showLegend = function (targetIds) {
        var $$ = this,
            config = $$.config;
        if (!config.legend_show) {
            config.legend_show = true;
            $$.legend.style('visibility', 'visible');
            if (!$$.legendHasRendered) {
                $$.updateLegendWithDefaults();
            }
        }
        $$.removeHiddenLegendIds(targetIds);
        $$.legend.selectAll($$.selectorLegends(targetIds)).style('visibility', 'visible').transition().style('opacity', function () {
            return $$.opacityForLegend($$.d3.select(this));
        });
    };
    c3_chart_internal_fn.hideLegend = function (targetIds) {
        var $$ = this,
            config = $$.config;
        if (config.legend_show && isEmpty(targetIds)) {
            config.legend_show = false;
            $$.legend.style('visibility', 'hidden');
        }
        $$.addHiddenLegendIds(targetIds);
        $$.legend.selectAll($$.selectorLegends(targetIds)).style('opacity', 0).style('visibility', 'hidden');
    };
    c3_chart_internal_fn.clearLegendItemTextBoxCache = function () {
        this.legendItemTextBox = {};
    };
    c3_chart_internal_fn.updateLegend = function (targetIds, options, transitions) {
        var $$ = this,
            config = $$.config;
        var xForLegend, xForLegendText, xForLegendRect, yForLegend, yForLegendText, yForLegendRect, x1ForLegendTile, x2ForLegendTile, yForLegendTile;
        var paddingTop = 4,
            paddingRight = 10,
            maxWidth = 0,
            maxHeight = 0,
            posMin = 10,
            tileWidth = config.legend_item_tile_width + 5;
        var l,
            totalLength = 0,
            offsets = {},
            widths = {},
            heights = {},
            margins = [0],
            steps = {},
            step = 0;
        var withTransition, withTransitionForTransform;
        var texts, rects, tiles, background;

        // Skip elements when their name is set to null
        targetIds = targetIds.filter(function (id) {
            return !isDefined(config.data_names[id]) || config.data_names[id] !== null;
        });

        options = options || {};
        withTransition = getOption(options, "withTransition", true);
        withTransitionForTransform = getOption(options, "withTransitionForTransform", true);

        function getTextBox(textElement, id) {
            if (!$$.legendItemTextBox[id]) {
                $$.legendItemTextBox[id] = $$.getTextRect(textElement.textContent, CLASS.legendItem, textElement);
            }
            return $$.legendItemTextBox[id];
        }

        function updatePositions(textElement, id, index) {
            var reset = index === 0,
                isLast = index === targetIds.length - 1,
                box = getTextBox(textElement, id),
                itemWidth = box.width + tileWidth + (isLast && !($$.isLegendRight || $$.isLegendInset) ? 0 : paddingRight) + config.legend_padding,
                itemHeight = box.height + paddingTop,
                itemLength = $$.isLegendRight || $$.isLegendInset ? itemHeight : itemWidth,
                areaLength = $$.isLegendRight || $$.isLegendInset ? $$.getLegendHeight() : $$.getLegendWidth(),
                margin,
                maxLength;

            // MEMO: care about condifion of step, totalLength
            function updateValues(id, withoutStep) {
                if (!withoutStep) {
                    margin = (areaLength - totalLength - itemLength) / 2;
                    if (margin < posMin) {
                        margin = (areaLength - itemLength) / 2;
                        totalLength = 0;
                        step++;
                    }
                }
                steps[id] = step;
                margins[step] = $$.isLegendInset ? 10 : margin;
                offsets[id] = totalLength;
                totalLength += itemLength;
            }

            if (reset) {
                totalLength = 0;
                step = 0;
                maxWidth = 0;
                maxHeight = 0;
            }

            if (config.legend_show && !$$.isLegendToShow(id)) {
                widths[id] = heights[id] = steps[id] = offsets[id] = 0;
                return;
            }

            widths[id] = itemWidth;
            heights[id] = itemHeight;

            if (!maxWidth || itemWidth >= maxWidth) {
                maxWidth = itemWidth;
            }
            if (!maxHeight || itemHeight >= maxHeight) {
                maxHeight = itemHeight;
            }
            maxLength = $$.isLegendRight || $$.isLegendInset ? maxHeight : maxWidth;

            if (config.legend_equally) {
                Object.keys(widths).forEach(function (id) {
                    widths[id] = maxWidth;
                });
                Object.keys(heights).forEach(function (id) {
                    heights[id] = maxHeight;
                });
                margin = (areaLength - maxLength * targetIds.length) / 2;
                if (margin < posMin) {
                    totalLength = 0;
                    step = 0;
                    targetIds.forEach(function (id) {
                        updateValues(id);
                    });
                } else {
                    updateValues(id, true);
                }
            } else {
                updateValues(id);
            }
        }

        if ($$.isLegendInset) {
            step = config.legend_inset_step ? config.legend_inset_step : targetIds.length;
            $$.updateLegendStep(step);
        }

        if ($$.isLegendRight) {
            xForLegend = function xForLegend(id) {
                return maxWidth * steps[id];
            };
            yForLegend = function yForLegend(id) {
                return margins[steps[id]] + offsets[id];
            };
        } else if ($$.isLegendInset) {
            xForLegend = function xForLegend(id) {
                return maxWidth * steps[id] + 10;
            };
            yForLegend = function yForLegend(id) {
                return margins[steps[id]] + offsets[id];
            };
        } else {
            xForLegend = function xForLegend(id) {
                return margins[steps[id]] + offsets[id];
            };
            yForLegend = function yForLegend(id) {
                return maxHeight * steps[id];
            };
        }
        xForLegendText = function xForLegendText(id, i) {
            return xForLegend(id, i) + 4 + config.legend_item_tile_width;
        };
        yForLegendText = function yForLegendText(id, i) {
            return yForLegend(id, i) + 9;
        };
        xForLegendRect = function xForLegendRect(id, i) {
            return xForLegend(id, i);
        };
        yForLegendRect = function yForLegendRect(id, i) {
            return yForLegend(id, i) - 5;
        };
        x1ForLegendTile = function x1ForLegendTile(id, i) {
            return xForLegend(id, i) - 2;
        };
        x2ForLegendTile = function x2ForLegendTile(id, i) {
            return xForLegend(id, i) - 2 + config.legend_item_tile_width;
        };
        yForLegendTile = function yForLegendTile(id, i) {
            return yForLegend(id, i) + 4;
        };

        // Define g for legend area
        l = $$.legend.selectAll('.' + CLASS.legendItem).data(targetIds).enter().append('g').attr('class', function (id) {
            return $$.generateClass(CLASS.legendItem, id);
        }).style('visibility', function (id) {
            return $$.isLegendToShow(id) ? 'visible' : 'hidden';
        }).style('cursor', 'pointer').on('click', function (id) {
            if (config.legend_item_onclick) {
                config.legend_item_onclick.call($$, id);
            } else {
                if ($$.d3.event.altKey) {
                    $$.api.hide();
                    $$.api.show(id);
                } else {
                    $$.api.toggle(id);
                    $$.isTargetToShow(id) ? $$.api.focus(id) : $$.api.revert();
                }
            }
        }).on('mouseover', function (id) {
            if (config.legend_item_onmouseover) {
                config.legend_item_onmouseover.call($$, id);
            } else {
                $$.d3.select(this).classed(CLASS.legendItemFocused, true);
                if (!$$.transiting && $$.isTargetToShow(id)) {
                    $$.api.focus(id);
                }
            }
        }).on('mouseout', function (id) {
            if (config.legend_item_onmouseout) {
                config.legend_item_onmouseout.call($$, id);
            } else {
                $$.d3.select(this).classed(CLASS.legendItemFocused, false);
                $$.api.revert();
            }
        });
        l.append('text').text(function (id) {
            return isDefined(config.data_names[id]) ? config.data_names[id] : id;
        }).each(function (id, i) {
            updatePositions(this, id, i);
        }).style("pointer-events", "none").attr('x', $$.isLegendRight || $$.isLegendInset ? xForLegendText : -200).attr('y', $$.isLegendRight || $$.isLegendInset ? -200 : yForLegendText);
        l.append('rect').attr("class", CLASS.legendItemEvent).style('fill-opacity', 0).attr('x', $$.isLegendRight || $$.isLegendInset ? xForLegendRect : -200).attr('y', $$.isLegendRight || $$.isLegendInset ? -200 : yForLegendRect);
        l.append('line').attr('class', CLASS.legendItemTile).style('stroke', $$.color).style("pointer-events", "none").attr('x1', $$.isLegendRight || $$.isLegendInset ? x1ForLegendTile : -200).attr('y1', $$.isLegendRight || $$.isLegendInset ? -200 : yForLegendTile).attr('x2', $$.isLegendRight || $$.isLegendInset ? x2ForLegendTile : -200).attr('y2', $$.isLegendRight || $$.isLegendInset ? -200 : yForLegendTile).attr('stroke-width', config.legend_item_tile_height);

        // Set background for inset legend
        background = $$.legend.select('.' + CLASS.legendBackground + ' rect');
        if ($$.isLegendInset && maxWidth > 0 && background.size() === 0) {
            background = $$.legend.insert('g', '.' + CLASS.legendItem).attr("class", CLASS.legendBackground).append('rect');
        }

        texts = $$.legend.selectAll('text').data(targetIds).text(function (id) {
            return isDefined(config.data_names[id]) ? config.data_names[id] : id;
        }) // MEMO: needed for update
        .each(function (id, i) {
            updatePositions(this, id, i);
        });
        (withTransition ? texts.transition() : texts).attr('x', xForLegendText).attr('y', yForLegendText);

        rects = $$.legend.selectAll('rect.' + CLASS.legendItemEvent).data(targetIds);
        (withTransition ? rects.transition() : rects).attr('width', function (id) {
            return widths[id];
        }).attr('height', function (id) {
            return heights[id];
        }).attr('x', xForLegendRect).attr('y', yForLegendRect);

        tiles = $$.legend.selectAll('line.' + CLASS.legendItemTile).data(targetIds);
        (withTransition ? tiles.transition() : tiles).style('stroke', $$.levelColor ? function (id) {
            return $$.levelColor($$.cache[id].values[0].value);
        } : $$.color).attr('x1', x1ForLegendTile).attr('y1', yForLegendTile).attr('x2', x2ForLegendTile).attr('y2', yForLegendTile);

        if (background) {
            (withTransition ? background.transition() : background).attr('height', $$.getLegendHeight() - 12).attr('width', maxWidth * (step + 1) + 10);
        }

        // toggle legend state
        $$.legend.selectAll('.' + CLASS.legendItem).classed(CLASS.legendItemHidden, function (id) {
            return !$$.isTargetToShow(id);
        });

        // Update all to reflect change of legend
        $$.updateLegendItemWidth(maxWidth);
        $$.updateLegendItemHeight(maxHeight);
        $$.updateLegendStep(step);
        // Update size and scale
        $$.updateSizes();
        $$.updateScales();
        $$.updateSvgSize();
        // Update g positions
        $$.transformAll(withTransitionForTransform, transitions);
        $$.legendHasRendered = true;
    };

    c3_chart_internal_fn.initRegion = function () {
        var $$ = this;
        $$.region = $$.main.append('g').attr("clip-path", $$.clipPath).attr("class", CLASS.regions);
    };
    c3_chart_internal_fn.updateRegion = function (duration) {
        var $$ = this,
            config = $$.config;

        // hide if arc type
        $$.region.style('visibility', $$.hasArcType() ? 'hidden' : 'visible');

        var mainRegion = $$.main.select('.' + CLASS.regions).selectAll('.' + CLASS.region).data(config.regions);
        var mainRegionEnter = mainRegion.enter().append('rect').attr("x", $$.regionX.bind($$)).attr("y", $$.regionY.bind($$)).attr("width", $$.regionWidth.bind($$)).attr("height", $$.regionHeight.bind($$)).style("fill-opacity", 0);
        $$.mainRegion = mainRegionEnter.merge(mainRegion).attr('class', $$.classRegion.bind($$));
        mainRegion.exit().transition().duration(duration).style("opacity", 0).remove();
    };
    c3_chart_internal_fn.redrawRegion = function (withTransition, transition) {
        var $$ = this,
            regions = $$.mainRegion;
        return [(withTransition ? regions.transition(transition) : regions).attr("x", $$.regionX.bind($$)).attr("y", $$.regionY.bind($$)).attr("width", $$.regionWidth.bind($$)).attr("height", $$.regionHeight.bind($$)).style("fill-opacity", function (d) {
            return isValue(d.opacity) ? d.opacity : 0.1;
        })];
    };
    c3_chart_internal_fn.regionX = function (d) {
        var $$ = this,
            config = $$.config,
            xPos,
            yScale = d.axis === 'y' ? $$.y : $$.y2;
        if (d.axis === 'y' || d.axis === 'y2') {
            xPos = config.axis_rotated ? 'start' in d ? yScale(d.start) : 0 : 0;
        } else {
            xPos = config.axis_rotated ? 0 : 'start' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.start) : d.start) : 0;
        }
        return xPos;
    };
    c3_chart_internal_fn.regionY = function (d) {
        var $$ = this,
            config = $$.config,
            yPos,
            yScale = d.axis === 'y' ? $$.y : $$.y2;
        if (d.axis === 'y' || d.axis === 'y2') {
            yPos = config.axis_rotated ? 0 : 'end' in d ? yScale(d.end) : 0;
        } else {
            yPos = config.axis_rotated ? 'start' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.start) : d.start) : 0 : 0;
        }
        return yPos;
    };
    c3_chart_internal_fn.regionWidth = function (d) {
        var $$ = this,
            config = $$.config,
            start = $$.regionX(d),
            end,
            yScale = d.axis === 'y' ? $$.y : $$.y2;
        if (d.axis === 'y' || d.axis === 'y2') {
            end = config.axis_rotated ? 'end' in d ? yScale(d.end) : $$.width : $$.width;
        } else {
            end = config.axis_rotated ? $$.width : 'end' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.end) : d.end) : $$.width;
        }
        return end < start ? 0 : end - start;
    };
    c3_chart_internal_fn.regionHeight = function (d) {
        var $$ = this,
            config = $$.config,
            start = this.regionY(d),
            end,
            yScale = d.axis === 'y' ? $$.y : $$.y2;
        if (d.axis === 'y' || d.axis === 'y2') {
            end = config.axis_rotated ? $$.height : 'start' in d ? yScale(d.start) : $$.height;
        } else {
            end = config.axis_rotated ? 'end' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.end) : d.end) : $$.height : $$.height;
        }
        return end < start ? 0 : end - start;
    };
    c3_chart_internal_fn.isRegionOnX = function (d) {
        return !d.axis || d.axis === 'x';
    };

    c3_chart_internal_fn.getScale = function (min, max, forTimeseries) {
        return (forTimeseries ? this.d3.scaleTime() : this.d3.scaleLinear()).range([min, max]);
    };
    c3_chart_internal_fn.getX = function (min, max, domain, offset) {
        var $$ = this,
            scale = $$.getScale(min, max, $$.isTimeSeries()),
            _scale = domain ? scale.domain(domain) : scale,
            key;
        // Define customized scale if categorized axis
        if ($$.isCategorized()) {
            offset = offset || function () {
                return 0;
            };
            scale = function scale(d, raw) {
                var v = _scale(d) + offset(d);
                return raw ? v : Math.ceil(v);
            };
        } else {
            scale = function scale(d, raw) {
                var v = _scale(d);
                return raw ? v : Math.ceil(v);
            };
        }
        // define functions
        for (key in _scale) {
            scale[key] = _scale[key];
        }
        scale.orgDomain = function () {
            return _scale.domain();
        };
        // define custom domain() for categorized axis
        if ($$.isCategorized()) {
            scale.domain = function (domain) {
                if (!arguments.length) {
                    domain = this.orgDomain();
                    return [domain[0], domain[1] + 1];
                }
                _scale.domain(domain);
                return scale;
            };
        }
        return scale;
    };
    c3_chart_internal_fn.getY = function (min, max, domain) {
        var scale = this.getScale(min, max, this.isTimeSeriesY());
        if (domain) {
            scale.domain(domain);
        }
        return scale;
    };
    c3_chart_internal_fn.getYScale = function (id) {
        return this.axis.getId(id) === 'y2' ? this.y2 : this.y;
    };
    c3_chart_internal_fn.getSubYScale = function (id) {
        return this.axis.getId(id) === 'y2' ? this.subY2 : this.subY;
    };
    c3_chart_internal_fn.updateScales = function () {
        var $$ = this,
            config = $$.config,
            forInit = !$$.x;
        // update edges
        $$.xMin = config.axis_rotated ? 1 : 0;
        $$.xMax = config.axis_rotated ? $$.height : $$.width;
        $$.yMin = config.axis_rotated ? 0 : $$.height;
        $$.yMax = config.axis_rotated ? $$.width : 1;
        $$.subXMin = $$.xMin;
        $$.subXMax = $$.xMax;
        $$.subYMin = config.axis_rotated ? 0 : $$.height2;
        $$.subYMax = config.axis_rotated ? $$.width2 : 1;
        // update scales
        $$.x = $$.getX($$.xMin, $$.xMax, forInit ? undefined : $$.x.orgDomain(), function () {
            return $$.xAxis.tickOffset();
        });
        $$.y = $$.getY($$.yMin, $$.yMax, forInit ? config.axis_y_default : $$.y.domain());
        $$.y2 = $$.getY($$.yMin, $$.yMax, forInit ? config.axis_y2_default : $$.y2.domain());
        $$.subX = $$.getX($$.xMin, $$.xMax, $$.orgXDomain, function (d) {
            return d % 1 ? 0 : $$.subXAxis.tickOffset();
        });
        $$.subY = $$.getY($$.subYMin, $$.subYMax, forInit ? config.axis_y_default : $$.subY.domain());
        $$.subY2 = $$.getY($$.subYMin, $$.subYMax, forInit ? config.axis_y2_default : $$.subY2.domain());
        // update axes
        $$.xAxisTickFormat = $$.axis.getXAxisTickFormat();
        $$.xAxisTickValues = $$.axis.getXAxisTickValues();
        $$.yAxisTickValues = $$.axis.getYAxisTickValues();
        $$.y2AxisTickValues = $$.axis.getY2AxisTickValues();

        $$.xAxis = $$.axis.getXAxis($$.x, $$.xOrient, $$.xAxisTickFormat, $$.xAxisTickValues, config.axis_x_tick_outer);
        $$.subXAxis = $$.axis.getXAxis($$.subX, $$.subXOrient, $$.xAxisTickFormat, $$.xAxisTickValues, config.axis_x_tick_outer);
        $$.yAxis = $$.axis.getYAxis($$.y, $$.yOrient, config.axis_y_tick_format, $$.yAxisTickValues, config.axis_y_tick_outer);
        $$.y2Axis = $$.axis.getYAxis($$.y2, $$.y2Orient, config.axis_y2_tick_format, $$.y2AxisTickValues, config.axis_y2_tick_outer);

        // Set initialized scales to brush and zoom
        if (!forInit) {
            if ($$.brush) {
                $$.brush.updateScale($$.subX);
            }
        }
        // update for arc
        if ($$.updateArc) {
            $$.updateArc();
        }
    };

    c3_chart_internal_fn.selectPoint = function (target, d, i) {
        var $$ = this,
            config = $$.config,
            cx = (config.axis_rotated ? $$.circleY : $$.circleX).bind($$),
            cy = (config.axis_rotated ? $$.circleX : $$.circleY).bind($$),
            r = $$.pointSelectR.bind($$);
        config.data_onselected.call($$.api, d, target.node());
        // add selected-circle on low layer g
        $$.main.select('.' + CLASS.selectedCircles + $$.getTargetSelectorSuffix(d.id)).selectAll('.' + CLASS.selectedCircle + '-' + i).data([d]).enter().append('circle').attr("class", function () {
            return $$.generateClass(CLASS.selectedCircle, i);
        }).attr("cx", cx).attr("cy", cy).attr("stroke", function () {
            return $$.color(d);
        }).attr("r", function (d) {
            return $$.pointSelectR(d) * 1.4;
        }).transition().duration(100).attr("r", r);
    };
    c3_chart_internal_fn.unselectPoint = function (target, d, i) {
        var $$ = this;
        $$.config.data_onunselected.call($$.api, d, target.node());
        // remove selected-circle from low layer g
        $$.main.select('.' + CLASS.selectedCircles + $$.getTargetSelectorSuffix(d.id)).selectAll('.' + CLASS.selectedCircle + '-' + i).transition().duration(100).attr('r', 0).remove();
    };
    c3_chart_internal_fn.togglePoint = function (selected, target, d, i) {
        selected ? this.selectPoint(target, d, i) : this.unselectPoint(target, d, i);
    };
    c3_chart_internal_fn.selectPath = function (target, d) {
        var $$ = this;
        $$.config.data_onselected.call($$, d, target.node());
        if ($$.config.interaction_brighten) {
            target.transition().duration(100).style("fill", function () {
                return $$.d3.rgb($$.color(d)).brighter(0.75);
            });
        }
    };
    c3_chart_internal_fn.unselectPath = function (target, d) {
        var $$ = this;
        $$.config.data_onunselected.call($$, d, target.node());
        if ($$.config.interaction_brighten) {
            target.transition().duration(100).style("fill", function () {
                return $$.color(d);
            });
        }
    };
    c3_chart_internal_fn.togglePath = function (selected, target, d, i) {
        selected ? this.selectPath(target, d, i) : this.unselectPath(target, d, i);
    };
    c3_chart_internal_fn.getToggle = function (that, d) {
        var $$ = this,
            toggle;
        if (that.nodeName === 'circle') {
            if ($$.isStepType(d)) {
                // circle is hidden in step chart, so treat as within the click area
                toggle = function toggle() {}; // TODO: how to select step chart?
            } else {
                toggle = $$.togglePoint;
            }
        } else if (that.nodeName === 'path') {
            toggle = $$.togglePath;
        }
        return toggle;
    };
    c3_chart_internal_fn.toggleShape = function (that, d, i) {
        var $$ = this,
            d3 = $$.d3,
            config = $$.config,
            shape = d3.select(that),
            isSelected = shape.classed(CLASS.SELECTED),
            toggle = $$.getToggle(that, d).bind($$);

        if (config.data_selection_enabled && config.data_selection_isselectable(d)) {
            if (!config.data_selection_multiple) {
                $$.main.selectAll('.' + CLASS.shapes + (config.data_selection_grouped ? $$.getTargetSelectorSuffix(d.id) : "")).selectAll('.' + CLASS.shape).each(function (d, i) {
                    var shape = d3.select(this);
                    if (shape.classed(CLASS.SELECTED)) {
                        toggle(false, shape.classed(CLASS.SELECTED, false), d, i);
                    }
                });
            }
            shape.classed(CLASS.SELECTED, !isSelected);
            toggle(!isSelected, shape, d, i);
        }
    };

    c3_chart_internal_fn.initBar = function () {
        var $$ = this;
        $$.main.select('.' + CLASS.chart).append("g").attr("class", CLASS.chartBars);
    };
    c3_chart_internal_fn.updateTargetsForBar = function (targets) {
        var $$ = this,
            config = $$.config,
            mainBars,
            mainBarEnter,
            classChartBar = $$.classChartBar.bind($$),
            classBars = $$.classBars.bind($$),
            classFocus = $$.classFocus.bind($$);
        mainBars = $$.main.select('.' + CLASS.chartBars).selectAll('.' + CLASS.chartBar).data(targets).attr('class', function (d) {
            return classChartBar(d) + classFocus(d);
        });
        mainBarEnter = mainBars.enter().append('g').attr('class', classChartBar).style("pointer-events", "none");
        // Bars for each data
        mainBarEnter.append('g').attr("class", classBars).style("cursor", function (d) {
            return config.data_selection_isselectable(d) ? "pointer" : null;
        });
    };
    c3_chart_internal_fn.updateBar = function (durationForExit) {
        var $$ = this,
            barData = $$.barData.bind($$),
            classBar = $$.classBar.bind($$),
            initialOpacity = $$.initialOpacity.bind($$),
            color = function color(d) {
            return $$.color(d.id);
        };
        var mainBar = $$.main.selectAll('.' + CLASS.bars).selectAll('.' + CLASS.bar).data(barData);
        var mainBarEnter = mainBar.enter().append('path').attr("class", classBar).style("stroke", color).style("fill", color);
        $$.mainBar = mainBarEnter.merge(mainBar).style("opacity", initialOpacity);
        mainBar.exit().transition().duration(durationForExit).style("opacity", 0);
    };
    c3_chart_internal_fn.redrawBar = function (drawBar, withTransition, transition) {
        return [(withTransition ? this.mainBar.transition(transition) : this.mainBar).attr('d', drawBar).style("stroke", this.color).style("fill", this.color).style("opacity", 1)];
    };
    c3_chart_internal_fn.getBarW = function (axis, barTargetsNum) {
        var $$ = this,
            config = $$.config,
            w = typeof config.bar_width === 'number' ? config.bar_width : barTargetsNum ? axis.tickInterval() * config.bar_width_ratio / barTargetsNum : 0;
        return config.bar_width_max && w > config.bar_width_max ? config.bar_width_max : w;
    };
    c3_chart_internal_fn.getBars = function (i, id) {
        var $$ = this;
        return (id ? $$.main.selectAll('.' + CLASS.bars + $$.getTargetSelectorSuffix(id)) : $$.main).selectAll('.' + CLASS.bar + (isValue(i) ? '-' + i : ''));
    };
    c3_chart_internal_fn.expandBars = function (i, id, reset) {
        var $$ = this;
        if (reset) {
            $$.unexpandBars();
        }
        $$.getBars(i, id).classed(CLASS.EXPANDED, true);
    };
    c3_chart_internal_fn.unexpandBars = function (i) {
        var $$ = this;
        $$.getBars(i).classed(CLASS.EXPANDED, false);
    };
    c3_chart_internal_fn.generateDrawBar = function (barIndices, isSub) {
        var $$ = this,
            config = $$.config,
            getPoints = $$.generateGetBarPoints(barIndices, isSub);
        return function (d, i) {
            // 4 points that make a bar
            var points = getPoints(d, i);

            // switch points if axis is rotated, not applicable for sub chart
            var indexX = config.axis_rotated ? 1 : 0;
            var indexY = config.axis_rotated ? 0 : 1;

            var path = 'M ' + points[0][indexX] + ',' + points[0][indexY] + ' ' + 'L' + points[1][indexX] + ',' + points[1][indexY] + ' ' + 'L' + points[2][indexX] + ',' + points[2][indexY] + ' ' + 'L' + points[3][indexX] + ',' + points[3][indexY] + ' ' + 'z';

            return path;
        };
    };
    c3_chart_internal_fn.generateGetBarPoints = function (barIndices, isSub) {
        var $$ = this,
            axis = isSub ? $$.subXAxis : $$.xAxis,
            barTargetsNum = barIndices.__max__ + 1,
            barW = $$.getBarW(axis, barTargetsNum),
            barX = $$.getShapeX(barW, barTargetsNum, barIndices, !!isSub),
            barY = $$.getShapeY(!!isSub),
            barOffset = $$.getShapeOffset($$.isBarType, barIndices, !!isSub),
            barSpaceOffset = barW * ($$.config.bar_space / 2),
            yScale = isSub ? $$.getSubYScale : $$.getYScale;
        return function (d, i) {
            var y0 = yScale.call($$, d.id)(0),
                offset = barOffset(d, i) || y0,
                // offset is for stacked bar chart
            posX = barX(d),
                posY = barY(d);
            // fix posY not to overflow opposite quadrant
            if ($$.config.axis_rotated) {
                if (0 < d.value && posY < y0 || d.value < 0 && y0 < posY) {
                    posY = y0;
                }
            }
            // 4 points that make a bar
            return [[posX + barSpaceOffset, offset], [posX + barSpaceOffset, posY - (y0 - offset)], [posX + barW - barSpaceOffset, posY - (y0 - offset)], [posX + barW - barSpaceOffset, offset]];
        };
    };
    c3_chart_internal_fn.isWithinBar = function (mouse, that) {
        var box = that.getBoundingClientRect(),
            seg0 = that.pathSegList.getItem(0),
            seg1 = that.pathSegList.getItem(1),
            x = Math.min(seg0.x, seg1.x),
            y = Math.min(seg0.y, seg1.y),
            w = box.width,
            h = box.height,
            offset = 2,
            sx = x - offset,
            ex = x + w + offset,
            sy = y + h + offset,
            ey = y - offset;
        return sx < mouse[0] && mouse[0] < ex && ey < mouse[1] && mouse[1] < sy;
    };

    c3_chart_internal_fn.getShapeIndices = function (typeFilter) {
        var $$ = this,
            config = $$.config,
            indices = {},
            i = 0,
            j,
            k;
        $$.filterTargetsToShow($$.data.targets.filter(typeFilter, $$)).forEach(function (d) {
            for (j = 0; j < config.data_groups.length; j++) {
                if (config.data_groups[j].indexOf(d.id) < 0) {
                    continue;
                }
                for (k = 0; k < config.data_groups[j].length; k++) {
                    if (config.data_groups[j][k] in indices) {
                        indices[d.id] = indices[config.data_groups[j][k]];
                        break;
                    }
                }
            }
            if (isUndefined(indices[d.id])) {
                indices[d.id] = i++;
            }
        });
        indices.__max__ = i - 1;
        return indices;
    };
    c3_chart_internal_fn.getShapeX = function (offset, targetsNum, indices, isSub) {
        var $$ = this,
            scale = isSub ? $$.subX : $$.x;
        return function (d) {
            var index = d.id in indices ? indices[d.id] : 0;
            return d.x || d.x === 0 ? scale(d.x) - offset * (targetsNum / 2 - index) : 0;
        };
    };
    c3_chart_internal_fn.getShapeY = function (isSub) {
        var $$ = this;
        return function (d) {
            var scale = isSub ? $$.getSubYScale(d.id) : $$.getYScale(d.id);
            return scale(d.value);
        };
    };
    c3_chart_internal_fn.getShapeOffset = function (typeFilter, indices, isSub) {
        var $$ = this,
            targets = $$.orderTargets($$.filterTargetsToShow($$.data.targets.filter(typeFilter, $$))),
            targetIds = targets.map(function (t) {
            return t.id;
        });
        return function (d, i) {
            var scale = isSub ? $$.getSubYScale(d.id) : $$.getYScale(d.id),
                y0 = scale(0),
                offset = y0;
            targets.forEach(function (t) {
                var values = $$.isStepType(d) ? $$.convertValuesToStep(t.values) : t.values;
                if (t.id === d.id || indices[t.id] !== indices[d.id]) {
                    return;
                }
                if (targetIds.indexOf(t.id) < targetIds.indexOf(d.id)) {
                    // check if the x values line up
                    if (typeof values[i] === 'undefined' || +values[i].x !== +d.x) {
                        // "+" for timeseries
                        // if not, try to find the value that does line up
                        i = -1;
                        values.forEach(function (v, j) {
                            if (v.x === d.x) {
                                i = j;
                            }
                        });
                    }
                    if (i in values && values[i].value * d.value >= 0) {
                        offset += scale(values[i].value) - y0;
                    }
                }
            });
            return offset;
        };
    };
    c3_chart_internal_fn.isWithinShape = function (that, d) {
        var $$ = this,
            shape = $$.d3.select(that),
            isWithin;
        if (!$$.isTargetToShow(d.id)) {
            isWithin = false;
        } else if (that.nodeName === 'circle') {
            isWithin = $$.isStepType(d) ? $$.isWithinStep(that, $$.getYScale(d.id)(d.value)) : $$.isWithinCircle(that, $$.pointSelectR(d) * 1.5);
        } else if (that.nodeName === 'path') {
            isWithin = shape.classed(CLASS.bar) ? $$.isWithinBar($$.d3.mouse(that), that) : true;
        }
        return isWithin;
    };

    c3_chart_internal_fn.getInterpolate = function (d) {
        var $$ = this,
            d3 = $$.d3,
            types = {
            'linear': d3.curveLinear,
            'linear-closed': d3.curveLinearClosed,
            'basis': d3.curveBasis,
            'basis-open': d3.curveBasisOpen,
            'basis-closed': d3.curveBasisClosed,
            'bundle': d3.curveBundle,
            'cardinal': d3.curveCardinal,
            'cardinal-open': d3.curveCardinalOpen,
            'cardinal-closed': d3.curveCardinalClosed,
            'monotone': d3.curveMonotoneX,
            'step': d3.curveStep
        },
            type;

        if ($$.isSplineType(d)) {
            type = types[$$.config.spline_interpolation_type] || types.cardinal;
        } else if ($$.isStepType(d)) {
            type = types[$$.config.line_step_type];
        } else {
            type = types.linear;
        }
        return type;
    };

    c3_chart_internal_fn.initLine = function () {
        var $$ = this;
        $$.main.select('.' + CLASS.chart).append("g").attr("class", CLASS.chartLines);
    };
    c3_chart_internal_fn.updateTargetsForLine = function (targets) {
        var $$ = this,
            config = $$.config,
            mainLines,
            mainLineEnter,
            classChartLine = $$.classChartLine.bind($$),
            classLines = $$.classLines.bind($$),
            classAreas = $$.classAreas.bind($$),
            classCircles = $$.classCircles.bind($$),
            classFocus = $$.classFocus.bind($$);
        mainLines = $$.main.select('.' + CLASS.chartLines).selectAll('.' + CLASS.chartLine).data(targets).attr('class', function (d) {
            return classChartLine(d) + classFocus(d);
        });
        mainLineEnter = mainLines.enter().append('g').attr('class', classChartLine).style('opacity', 0).style("pointer-events", "none");
        // Lines for each data
        mainLineEnter.append('g').attr("class", classLines);
        // Areas
        mainLineEnter.append('g').attr('class', classAreas);
        // Circles for each data point on lines
        mainLineEnter.append('g').attr("class", function (d) {
            return $$.generateClass(CLASS.selectedCircles, d.id);
        });
        mainLineEnter.append('g').attr("class", classCircles).style("cursor", function (d) {
            return config.data_selection_isselectable(d) ? "pointer" : null;
        });
        // Update date for selected circles
        targets.forEach(function (t) {
            $$.main.selectAll('.' + CLASS.selectedCircles + $$.getTargetSelectorSuffix(t.id)).selectAll('.' + CLASS.selectedCircle).each(function (d) {
                d.value = t.values[d.index].value;
            });
        });
        // MEMO: can not keep same color...
        //mainLineUpdate.exit().remove();
    };
    c3_chart_internal_fn.updateLine = function (durationForExit) {
        var $$ = this;
        var mainLine = $$.main.selectAll('.' + CLASS.lines).selectAll('.' + CLASS.line).data($$.lineData.bind($$));
        var mainLineEnter = mainLine.enter().append('path').attr('class', $$.classLine.bind($$)).style("stroke", $$.color);
        $$.mainLine = mainLineEnter.merge(mainLine).style("opacity", $$.initialOpacity.bind($$)).style('shape-rendering', function (d) {
            return $$.isStepType(d) ? 'crispEdges' : '';
        }).attr('transform', null);
        mainLine.exit().transition().duration(durationForExit).style('opacity', 0);
    };
    c3_chart_internal_fn.redrawLine = function (drawLine, withTransition, transition) {
        return [(withTransition ? this.mainLine.transition(transition) : this.mainLine).attr("d", drawLine).style("stroke", this.color).style("opacity", 1)];
    };
    c3_chart_internal_fn.generateDrawLine = function (lineIndices, isSub) {
        var $$ = this,
            config = $$.config,
            line = $$.d3.line(),
            getPoints = $$.generateGetLinePoints(lineIndices, isSub),
            yScaleGetter = isSub ? $$.getSubYScale : $$.getYScale,
            xValue = function xValue(d) {
            return (isSub ? $$.subxx : $$.xx).call($$, d);
        },
            yValue = function yValue(d, i) {
            return config.data_groups.length > 0 ? getPoints(d, i)[0][1] : yScaleGetter.call($$, d.id)(d.value);
        };

        line = config.axis_rotated ? line.x(yValue).y(xValue) : line.x(xValue).y(yValue);
        if (!config.line_connectNull) {
            line = line.defined(function (d) {
                return d.value != null;
            });
        }
        return function (d) {
            var values = config.line_connectNull ? $$.filterRemoveNull(d.values) : d.values,
                x = isSub ? $$.subX : $$.x,
                y = yScaleGetter.call($$, d.id),
                x0 = 0,
                y0 = 0,
                path;
            if ($$.isLineType(d)) {
                if (config.data_regions[d.id]) {
                    path = $$.lineWithRegions(values, x, y, config.data_regions[d.id]);
                } else {
                    if ($$.isStepType(d)) {
                        values = $$.convertValuesToStep(values);
                    }
                    path = line.curve($$.getInterpolate(d))(values);
                }
            } else {
                if (values[0]) {
                    x0 = x(values[0].x);
                    y0 = y(values[0].value);
                }
                path = config.axis_rotated ? "M " + y0 + " " + x0 : "M " + x0 + " " + y0;
            }
            return path ? path : "M 0 0";
        };
    };
    c3_chart_internal_fn.generateGetLinePoints = function (lineIndices, isSub) {
        // partial duplication of generateGetBarPoints
        var $$ = this,
            config = $$.config,
            lineTargetsNum = lineIndices.__max__ + 1,
            x = $$.getShapeX(0, lineTargetsNum, lineIndices, !!isSub),
            y = $$.getShapeY(!!isSub),
            lineOffset = $$.getShapeOffset($$.isLineType, lineIndices, !!isSub),
            yScale = isSub ? $$.getSubYScale : $$.getYScale;
        return function (d, i) {
            var y0 = yScale.call($$, d.id)(0),
                offset = lineOffset(d, i) || y0,
                // offset is for stacked area chart
            posX = x(d),
                posY = y(d);
            // fix posY not to overflow opposite quadrant
            if (config.axis_rotated) {
                if (0 < d.value && posY < y0 || d.value < 0 && y0 < posY) {
                    posY = y0;
                }
            }
            // 1 point that marks the line position
            return [[posX, posY - (y0 - offset)], [posX, posY - (y0 - offset)], // needed for compatibility
            [posX, posY - (y0 - offset)], // needed for compatibility
            [posX, posY - (y0 - offset)] // needed for compatibility
            ];
        };
    };

    c3_chart_internal_fn.lineWithRegions = function (d, x, y, _regions) {
        var $$ = this,
            config = $$.config,
            prev = -1,
            i,
            j,
            s = "M",
            sWithRegion,
            xp,
            yp,
            dx,
            dy,
            dd,
            diff,
            diffx2,
            xOffset = $$.isCategorized() ? 0.5 : 0,
            xValue,
            yValue,
            regions = [];

        function isWithinRegions(x, regions) {
            var i;
            for (i = 0; i < regions.length; i++) {
                if (regions[i].start < x && x <= regions[i].end) {
                    return true;
                }
            }
            return false;
        }

        // Check start/end of regions
        if (isDefined(_regions)) {
            for (i = 0; i < _regions.length; i++) {
                regions[i] = {};
                if (isUndefined(_regions[i].start)) {
                    regions[i].start = d[0].x;
                } else {
                    regions[i].start = $$.isTimeSeries() ? $$.parseDate(_regions[i].start) : _regions[i].start;
                }
                if (isUndefined(_regions[i].end)) {
                    regions[i].end = d[d.length - 1].x;
                } else {
                    regions[i].end = $$.isTimeSeries() ? $$.parseDate(_regions[i].end) : _regions[i].end;
                }
            }
        }

        // Set scales
        xValue = config.axis_rotated ? function (d) {
            return y(d.value);
        } : function (d) {
            return x(d.x);
        };
        yValue = config.axis_rotated ? function (d) {
            return x(d.x);
        } : function (d) {
            return y(d.value);
        };

        // Define svg generator function for region
        function generateM(points) {
            return 'M' + points[0][0] + ' ' + points[0][1] + ' ' + points[1][0] + ' ' + points[1][1];
        }
        if ($$.isTimeSeries()) {
            sWithRegion = function sWithRegion(d0, d1, j, diff) {
                var x0 = d0.x.getTime(),
                    x_diff = d1.x - d0.x,
                    xv0 = new Date(x0 + x_diff * j),
                    xv1 = new Date(x0 + x_diff * (j + diff)),
                    points;
                if (config.axis_rotated) {
                    points = [[y(yp(j)), x(xv0)], [y(yp(j + diff)), x(xv1)]];
                } else {
                    points = [[x(xv0), y(yp(j))], [x(xv1), y(yp(j + diff))]];
                }
                return generateM(points);
            };
        } else {
            sWithRegion = function sWithRegion(d0, d1, j, diff) {
                var points;
                if (config.axis_rotated) {
                    points = [[y(yp(j), true), x(xp(j))], [y(yp(j + diff), true), x(xp(j + diff))]];
                } else {
                    points = [[x(xp(j), true), y(yp(j))], [x(xp(j + diff), true), y(yp(j + diff))]];
                }
                return generateM(points);
            };
        }

        // Generate
        for (i = 0; i < d.length; i++) {

            // Draw as normal
            if (isUndefined(regions) || !isWithinRegions(d[i].x, regions)) {
                s += " " + xValue(d[i]) + " " + yValue(d[i]);
            }
            // Draw with region // TODO: Fix for horizotal charts
            else {
                    xp = $$.getScale(d[i - 1].x + xOffset, d[i].x + xOffset, $$.isTimeSeries());
                    yp = $$.getScale(d[i - 1].value, d[i].value);

                    dx = x(d[i].x) - x(d[i - 1].x);
                    dy = y(d[i].value) - y(d[i - 1].value);
                    dd = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));
                    diff = 2 / dd;
                    diffx2 = diff * 2;

                    for (j = diff; j <= 1; j += diffx2) {
                        s += sWithRegion(d[i - 1], d[i], j, diff);
                    }
                }
            prev = d[i].x;
        }

        return s;
    };

    c3_chart_internal_fn.updateArea = function (durationForExit) {
        var $$ = this,
            d3 = $$.d3;
        var mainArea = $$.main.selectAll('.' + CLASS.areas).selectAll('.' + CLASS.area).data($$.lineData.bind($$));
        var mainAreaEnter = mainArea.enter().append('path').attr("class", $$.classArea.bind($$)).style("fill", $$.color).style("opacity", function () {
            $$.orgAreaOpacity = +d3.select(this).style('opacity');return 0;
        });
        $$.mainArea = mainAreaEnter.merge(mainArea).style("opacity", $$.orgAreaOpacity);
        mainArea.exit().transition().duration(durationForExit).style('opacity', 0);
    };
    c3_chart_internal_fn.redrawArea = function (drawArea, withTransition, transition) {
        return [(withTransition ? this.mainArea.transition(transition) : this.mainArea).attr("d", drawArea).style("fill", this.color).style("opacity", this.orgAreaOpacity)];
    };
    c3_chart_internal_fn.generateDrawArea = function (areaIndices, isSub) {
        var $$ = this,
            config = $$.config,
            area = $$.d3.area(),
            getPoints = $$.generateGetAreaPoints(areaIndices, isSub),
            yScaleGetter = isSub ? $$.getSubYScale : $$.getYScale,
            xValue = function xValue(d) {
            return (isSub ? $$.subxx : $$.xx).call($$, d);
        },
            value0 = function value0(d, i) {
            return config.data_groups.length > 0 ? getPoints(d, i)[0][1] : yScaleGetter.call($$, d.id)($$.getAreaBaseValue(d.id));
        },
            value1 = function value1(d, i) {
            return config.data_groups.length > 0 ? getPoints(d, i)[1][1] : yScaleGetter.call($$, d.id)(d.value);
        };

        area = config.axis_rotated ? area.x0(value0).x1(value1).y(xValue) : area.x(xValue).y0(config.area_above ? 0 : value0).y1(value1);
        if (!config.line_connectNull) {
            area = area.defined(function (d) {
                return d.value !== null;
            });
        }

        return function (d) {
            var values = config.line_connectNull ? $$.filterRemoveNull(d.values) : d.values,
                x0 = 0,
                y0 = 0,
                path;
            if ($$.isAreaType(d)) {
                if ($$.isStepType(d)) {
                    values = $$.convertValuesToStep(values);
                }
                path = area.curve($$.getInterpolate(d))(values);
            } else {
                if (values[0]) {
                    x0 = $$.x(values[0].x);
                    y0 = $$.getYScale(d.id)(values[0].value);
                }
                path = config.axis_rotated ? "M " + y0 + " " + x0 : "M " + x0 + " " + y0;
            }
            return path ? path : "M 0 0";
        };
    };
    c3_chart_internal_fn.getAreaBaseValue = function () {
        return 0;
    };
    c3_chart_internal_fn.generateGetAreaPoints = function (areaIndices, isSub) {
        // partial duplication of generateGetBarPoints
        var $$ = this,
            config = $$.config,
            areaTargetsNum = areaIndices.__max__ + 1,
            x = $$.getShapeX(0, areaTargetsNum, areaIndices, !!isSub),
            y = $$.getShapeY(!!isSub),
            areaOffset = $$.getShapeOffset($$.isAreaType, areaIndices, !!isSub),
            yScale = isSub ? $$.getSubYScale : $$.getYScale;
        return function (d, i) {
            var y0 = yScale.call($$, d.id)(0),
                offset = areaOffset(d, i) || y0,
                // offset is for stacked area chart
            posX = x(d),
                posY = y(d);
            // fix posY not to overflow opposite quadrant
            if (config.axis_rotated) {
                if (0 < d.value && posY < y0 || d.value < 0 && y0 < posY) {
                    posY = y0;
                }
            }
            // 1 point that marks the area position
            return [[posX, offset], [posX, posY - (y0 - offset)], [posX, posY - (y0 - offset)], // needed for compatibility
            [posX, offset] // needed for compatibility
            ];
        };
    };

    c3_chart_internal_fn.updateCircle = function (cx, cy) {
        var $$ = this;
        var mainCircle = $$.main.selectAll('.' + CLASS.circles).selectAll('.' + CLASS.circle).data($$.lineOrScatterData.bind($$));
        var mainCircleEnter = mainCircle.enter().append("circle").attr("class", $$.classCircle.bind($$)).attr("cx", cx).attr("cy", cy).attr("r", $$.pointR.bind($$)).style("fill", $$.color);
        $$.mainCircle = mainCircleEnter.merge(mainCircle).style("opacity", $$.initialOpacityForCircle.bind($$));
        mainCircle.exit().style("opacity", 0);
    };
    c3_chart_internal_fn.redrawCircle = function (cx, cy, withTransition, transition) {
        var $$ = this,
            selectedCircles = $$.main.selectAll('.' + CLASS.selectedCircle);
        return [(withTransition ? $$.mainCircle.transition(transition) : $$.mainCircle).style('opacity', this.opacityForCircle.bind($$)).style("fill", $$.color).attr("cx", cx).attr("cy", cy), (withTransition ? selectedCircles.transition(transition) : selectedCircles).attr("cx", cx).attr("cy", cy)];
    };
    c3_chart_internal_fn.circleX = function (d) {
        return d.x || d.x === 0 ? this.x(d.x) : null;
    };
    c3_chart_internal_fn.updateCircleY = function () {
        var $$ = this,
            lineIndices,
            getPoints;
        if ($$.config.data_groups.length > 0) {
            lineIndices = $$.getShapeIndices($$.isLineType), getPoints = $$.generateGetLinePoints(lineIndices);
            $$.circleY = function (d, i) {
                return getPoints(d, i)[0][1];
            };
        } else {
            $$.circleY = function (d) {
                return $$.getYScale(d.id)(d.value);
            };
        }
    };
    c3_chart_internal_fn.getCircles = function (i, id) {
        var $$ = this;
        return (id ? $$.main.selectAll('.' + CLASS.circles + $$.getTargetSelectorSuffix(id)) : $$.main).selectAll('.' + CLASS.circle + (isValue(i) ? '-' + i : ''));
    };
    c3_chart_internal_fn.expandCircles = function (i, id, reset) {
        var $$ = this,
            r = $$.pointExpandedR.bind($$);
        if (reset) {
            $$.unexpandCircles();
        }
        $$.getCircles(i, id).classed(CLASS.EXPANDED, true).attr('r', r);
    };
    c3_chart_internal_fn.unexpandCircles = function (i) {
        var $$ = this,
            r = $$.pointR.bind($$);
        $$.getCircles(i).filter(function () {
            return $$.d3.select(this).classed(CLASS.EXPANDED);
        }).classed(CLASS.EXPANDED, false).attr('r', r);
    };
    c3_chart_internal_fn.pointR = function (d) {
        var $$ = this,
            config = $$.config;
        return $$.isStepType(d) ? 0 : isFunction(config.point_r) ? config.point_r(d) : config.point_r;
    };
    c3_chart_internal_fn.pointExpandedR = function (d) {
        var $$ = this,
            config = $$.config;
        if (config.point_focus_expand_enabled) {
            return isFunction(config.point_focus_expand_r) ? config.point_focus_expand_r(d) : config.point_focus_expand_r ? config.point_focus_expand_r : $$.pointR(d) * 1.75;
        } else {
            return $$.pointR(d);
        }
    };
    c3_chart_internal_fn.pointSelectR = function (d) {
        var $$ = this,
            config = $$.config;
        return isFunction(config.point_select_r) ? config.point_select_r(d) : config.point_select_r ? config.point_select_r : $$.pointR(d) * 4;
    };
    c3_chart_internal_fn.isWithinCircle = function (that, r) {
        var d3 = this.d3,
            mouse = d3.mouse(that),
            d3_this = d3.select(that),
            cx = +d3_this.attr("cx"),
            cy = +d3_this.attr("cy");
        return Math.sqrt(Math.pow(cx - mouse[0], 2) + Math.pow(cy - mouse[1], 2)) < r;
    };
    c3_chart_internal_fn.isWithinStep = function (that, y) {
        return Math.abs(y - this.d3.mouse(that)[1]) < 30;
    };

    c3_chart_internal_fn.getCurrentWidth = function () {
        var $$ = this,
            config = $$.config;
        return config.size_width ? config.size_width : $$.getParentWidth();
    };
    c3_chart_internal_fn.getCurrentHeight = function () {
        var $$ = this,
            config = $$.config,
            h = config.size_height ? config.size_height : $$.getParentHeight();
        return h > 0 ? h : 320 / ($$.hasType('gauge') && !config.gauge_fullCircle ? 2 : 1);
    };
    c3_chart_internal_fn.getCurrentPaddingTop = function () {
        var $$ = this,
            config = $$.config,
            padding = isValue(config.padding_top) ? config.padding_top : 0;
        if ($$.title && $$.title.node()) {
            padding += $$.getTitlePadding();
        }
        return padding;
    };
    c3_chart_internal_fn.getCurrentPaddingBottom = function () {
        var config = this.config;
        return isValue(config.padding_bottom) ? config.padding_bottom : 0;
    };
    c3_chart_internal_fn.getCurrentPaddingLeft = function (withoutRecompute) {
        var $$ = this,
            config = $$.config;
        if (isValue(config.padding_left)) {
            return config.padding_left;
        } else if (config.axis_rotated) {
            return !config.axis_x_show || config.axis_x_inner ? 1 : Math.max(ceil10($$.getAxisWidthByAxisId('x', withoutRecompute)), 40);
        } else if (!config.axis_y_show || config.axis_y_inner) {
            // && !config.axis_rotated
            return $$.axis.getYAxisLabelPosition().isOuter ? 30 : 1;
        } else {
            return ceil10($$.getAxisWidthByAxisId('y', withoutRecompute));
        }
    };
    c3_chart_internal_fn.getCurrentPaddingRight = function () {
        var $$ = this,
            config = $$.config,
            defaultPadding = 10,
            legendWidthOnRight = $$.isLegendRight ? $$.getLegendWidth() + 20 : 0;
        if (isValue(config.padding_right)) {
            return config.padding_right + 1; // 1 is needed not to hide tick line
        } else if (config.axis_rotated) {
            return defaultPadding + legendWidthOnRight;
        } else if (!config.axis_y2_show || config.axis_y2_inner) {
            // && !config.axis_rotated
            return 2 + legendWidthOnRight + ($$.axis.getY2AxisLabelPosition().isOuter ? 20 : 0);
        } else {
            return ceil10($$.getAxisWidthByAxisId('y2')) + legendWidthOnRight;
        }
    };

    c3_chart_internal_fn.getParentRectValue = function (key) {
        var parent = this.selectChart.node(),
            v;
        while (parent && parent.tagName !== 'BODY') {
            try {
                v = parent.getBoundingClientRect()[key];
            } catch (e) {
                if (key === 'width') {
                    // In IE in certain cases getBoundingClientRect
                    // will cause an "unspecified error"
                    v = parent.offsetWidth;
                }
            }
            if (v) {
                break;
            }
            parent = parent.parentNode;
        }
        return v;
    };
    c3_chart_internal_fn.getParentWidth = function () {
        return this.getParentRectValue('width');
    };
    c3_chart_internal_fn.getParentHeight = function () {
        var h = this.selectChart.style('height');
        return h.indexOf('px') > 0 ? +h.replace('px', '') : 0;
    };

    c3_chart_internal_fn.getSvgLeft = function (withoutRecompute) {
        var $$ = this,
            config = $$.config,
            hasLeftAxisRect = config.axis_rotated || !config.axis_rotated && !config.axis_y_inner,
            leftAxisClass = config.axis_rotated ? CLASS.axisX : CLASS.axisY,
            leftAxis = $$.main.select('.' + leftAxisClass).node(),
            svgRect = leftAxis && hasLeftAxisRect ? leftAxis.getBoundingClientRect() : { right: 0 },
            chartRect = $$.selectChart.node().getBoundingClientRect(),
            hasArc = $$.hasArcType(),
            svgLeft = svgRect.right - chartRect.left - (hasArc ? 0 : $$.getCurrentPaddingLeft(withoutRecompute));
        return svgLeft > 0 ? svgLeft : 0;
    };

    c3_chart_internal_fn.getAxisWidthByAxisId = function (id, withoutRecompute) {
        var $$ = this,
            position = $$.axis.getLabelPositionById(id);
        return $$.axis.getMaxTickWidth(id, withoutRecompute) + (position.isInner ? 20 : 40);
    };
    c3_chart_internal_fn.getHorizontalAxisHeight = function (axisId) {
        var $$ = this,
            config = $$.config,
            h = 30;
        if (axisId === 'x' && !config.axis_x_show) {
            return 8;
        }
        if (axisId === 'x' && config.axis_x_height) {
            return config.axis_x_height;
        }
        if (axisId === 'y' && !config.axis_y_show) {
            return config.legend_show && !$$.isLegendRight && !$$.isLegendInset ? 10 : 1;
        }
        if (axisId === 'y2' && !config.axis_y2_show) {
            return $$.rotated_padding_top;
        }
        // Calculate x axis height when tick rotated
        if (axisId === 'x' && !config.axis_rotated && config.axis_x_tick_rotate) {
            h = 30 + $$.axis.getMaxTickWidth(axisId) * Math.cos(Math.PI * (90 - Math.abs(config.axis_x_tick_rotate)) / 180);
        }
        // Calculate y axis height when tick rotated
        if (axisId === 'y' && config.axis_rotated && config.axis_y_tick_rotate) {
            h = 30 + $$.axis.getMaxTickWidth(axisId) * Math.cos(Math.PI * (90 - Math.abs(config.axis_y_tick_rotate)) / 180);
        }
        return h + ($$.axis.getLabelPositionById(axisId).isInner ? 0 : 10) + (axisId === 'y2' ? -10 : 0);
    };

    c3_chart_internal_fn.initBrush = function (scale) {
        var $$ = this,
            d3 = $$.d3;
        // TODO: dynamically change brushY/brushX according to axis_rotated.
        $$.brush = ($$.config.axis_rotated ? d3.brushY() : d3.brushX()).on("brush", function () {
            var event = d3.event.sourceEvent;
            if (event && event.type === "zoom") {
                return;
            }
            $$.redrawForBrush();
        }).on("end", function () {
            var event = d3.event.sourceEvent;
            if (event && event.type === "zoom") {
                return;
            }
            if ($$.brush.empty() && event && event.type !== 'end') {
                $$.brush.clear();
            }
        });
        $$.brush.updateExtent = function () {
            var range = this.scale.range(),
                extent;
            if ($$.config.axis_rotated) {
                extent = [[0, range[0]], [$$.width2, range[1]]];
            } else {
                extent = [[range[0], 0], [range[1], $$.height2]];
            }
            this.extent(extent);
            return this;
        };
        $$.brush.updateScale = function (scale) {
            this.scale = scale;
            return this;
        };
        $$.brush.update = function (scale) {
            this.updateScale(scale || $$.subX).updateExtent();
            $$.context.select('.' + CLASS.brush).call(this);
        };
        $$.brush.clear = function () {
            $$.context.select('.' + CLASS.brush).call($$.brush.move, null);
        };
        $$.brush.selection = function () {
            return d3.brushSelection($$.context.select('.' + CLASS.brush).node());
        };
        $$.brush.selectionAsValue = function (selectionAsValue, withTransition) {
            var selection, brush;
            if (selectionAsValue) {
                if ($$.context) {
                    selection = [this.scale(selectionAsValue[0]), this.scale(selectionAsValue[1])];
                    brush = $$.context.select('.' + CLASS.brush);
                    if (withTransition) {
                        brush = brush.transition();
                    }
                    $$.brush.move(brush, selection);
                }
                return [];
            }
            selection = $$.brush.selection() || [0, 0];
            return [this.scale.invert(selection[0]), this.scale.invert(selection[1])];
        };
        $$.brush.empty = function () {
            var selection = $$.brush.selection();
            return !selection || selection[0] === selection[1];
        };
        return $$.brush.updateScale(scale);
    };
    c3_chart_internal_fn.initSubchart = function () {
        var $$ = this,
            config = $$.config,
            context = $$.context = $$.svg.append("g").attr("transform", $$.getTranslate('context')),
            visibility = config.subchart_show ? 'visible' : 'hidden';

        // set style
        context.style('visibility', visibility);

        // Define g for chart area
        context.append('g').attr("clip-path", $$.clipPathForSubchart).attr('class', CLASS.chart);

        // Define g for bar chart area
        context.select('.' + CLASS.chart).append("g").attr("class", CLASS.chartBars);

        // Define g for line chart area
        context.select('.' + CLASS.chart).append("g").attr("class", CLASS.chartLines);

        // Add extent rect for Brush
        context.append("g").attr("clip-path", $$.clipPath).attr("class", CLASS.brush);

        // ATTENTION: This must be called AFTER chart added
        // Add Axis
        $$.axes.subx = context.append("g").attr("class", CLASS.axisX).attr("transform", $$.getTranslate('subx')).attr("clip-path", config.axis_rotated ? "" : $$.clipPathForXAxis);
    };
    c3_chart_internal_fn.initSubchartBrush = function () {
        var $$ = this;
        // Add extent rect for Brush
        $$.initBrush($$.subX).updateExtent();
        $$.context.select('.' + CLASS.brush).call($$.brush);
    };
    c3_chart_internal_fn.updateTargetsForSubchart = function (targets) {
        var $$ = this,
            context = $$.context,
            config = $$.config,
            contextLineEnter,
            contextLine,
            contextBarEnter,
            contextBar,
            classChartBar = $$.classChartBar.bind($$),
            classBars = $$.classBars.bind($$),
            classChartLine = $$.classChartLine.bind($$),
            classLines = $$.classLines.bind($$),
            classAreas = $$.classAreas.bind($$);

        if (config.subchart_show) {
            //-- Bar --//
            contextBar = context.select('.' + CLASS.chartBars).selectAll('.' + CLASS.chartBar).data(targets);
            contextBarEnter = contextBar.enter().append('g').style('opacity', 0);
            contextBarEnter.merge(contextBar).attr('class', classChartBar);
            // Bars for each data
            contextBarEnter.append('g').attr("class", classBars);

            //-- Line --//
            contextLine = context.select('.' + CLASS.chartLines).selectAll('.' + CLASS.chartLine).data(targets);
            contextLineEnter = contextLine.enter().append('g').style('opacity', 0);
            contextLineEnter.merge(contextLine).attr('class', classChartLine);
            // Lines for each data
            contextLineEnter.append("g").attr("class", classLines);
            // Area
            contextLineEnter.append("g").attr("class", classAreas);

            //-- Brush --//
            context.selectAll('.' + CLASS.brush + ' rect').attr(config.axis_rotated ? "width" : "height", config.axis_rotated ? $$.width2 : $$.height2);
        }
    };
    c3_chart_internal_fn.updateBarForSubchart = function (durationForExit) {
        var $$ = this;
        var contextBar = $$.context.selectAll('.' + CLASS.bars).selectAll('.' + CLASS.bar).data($$.barData.bind($$));
        var contextBarEnter = contextBar.enter().append('path').attr("class", $$.classBar.bind($$)).style("stroke", 'none').style("fill", $$.color);
        contextBar.exit().transition().duration(durationForExit).style('opacity', 0).remove();
        $$.contextBar = contextBarEnter.merge(contextBar).style("opacity", $$.initialOpacity.bind($$));
    };
    c3_chart_internal_fn.redrawBarForSubchart = function (drawBarOnSub, withTransition, duration) {
        (withTransition ? this.contextBar.transition(Math.random().toString()).duration(duration) : this.contextBar).attr('d', drawBarOnSub).style('opacity', 1);
    };
    c3_chart_internal_fn.updateLineForSubchart = function (durationForExit) {
        var $$ = this;
        var contextLine = $$.context.selectAll('.' + CLASS.lines).selectAll('.' + CLASS.line).data($$.lineData.bind($$));
        var contextLineEnter = contextLine.enter().append('path').attr('class', $$.classLine.bind($$)).style('stroke', $$.color);
        contextLine.exit().transition().duration(durationForExit).style('opacity', 0).remove();
        $$.contextLine = contextLineEnter.merge(contextLine).style("opacity", $$.initialOpacity.bind($$));
    };
    c3_chart_internal_fn.redrawLineForSubchart = function (drawLineOnSub, withTransition, duration) {
        (withTransition ? this.contextLine.transition(Math.random().toString()).duration(duration) : this.contextLine).attr("d", drawLineOnSub).style('opacity', 1);
    };
    c3_chart_internal_fn.updateAreaForSubchart = function (durationForExit) {
        var $$ = this,
            d3 = $$.d3;
        var contextArea = $$.context.selectAll('.' + CLASS.areas).selectAll('.' + CLASS.area).data($$.lineData.bind($$));
        var contextAreaEnter = contextArea.enter().append('path').attr("class", $$.classArea.bind($$)).style("fill", $$.color).style("opacity", function () {
            $$.orgAreaOpacity = +d3.select(this).style('opacity');return 0;
        });
        contextArea.exit().transition().duration(durationForExit).style('opacity', 0).remove();
        $$.contextArea = contextAreaEnter.merge(contextArea).style("opacity", 0);
    };
    c3_chart_internal_fn.redrawAreaForSubchart = function (drawAreaOnSub, withTransition, duration) {
        (withTransition ? this.contextArea.transition(Math.random().toString()).duration(duration) : this.contextArea).attr("d", drawAreaOnSub).style("fill", this.color).style("opacity", this.orgAreaOpacity);
    };
    c3_chart_internal_fn.redrawSubchart = function (withSubchart, transitions, duration, durationForExit, areaIndices, barIndices, lineIndices) {
        var $$ = this,
            d3 = $$.d3,
            config = $$.config,
            drawAreaOnSub,
            drawBarOnSub,
            drawLineOnSub;

        $$.context.style('visibility', config.subchart_show ? 'visible' : 'hidden');

        // subchart
        if (config.subchart_show) {
            // reflect main chart to extent on subchart if zoomed
            if (d3.event && d3.event.type === 'zoom') {
                $$.brush.selectionAsValue($$.x.orgDomain());
            }
            // update subchart elements if needed
            if (withSubchart) {
                // extent rect
                if (!$$.brush.empty()) {
                    $$.brush.selectionAsValue($$.x.orgDomain());
                }
                // setup drawer - MEMO: this must be called after axis updated
                drawAreaOnSub = $$.generateDrawArea(areaIndices, true);
                drawBarOnSub = $$.generateDrawBar(barIndices, true);
                drawLineOnSub = $$.generateDrawLine(lineIndices, true);

                $$.updateBarForSubchart(duration);
                $$.updateLineForSubchart(duration);
                $$.updateAreaForSubchart(duration);

                $$.redrawBarForSubchart(drawBarOnSub, duration, duration);
                $$.redrawLineForSubchart(drawLineOnSub, duration, duration);
                $$.redrawAreaForSubchart(drawAreaOnSub, duration, duration);
            }
        }
    };
    c3_chart_internal_fn.redrawForBrush = function () {
        var $$ = this,
            x = $$.x,
            d3 = $$.d3,
            s;
        $$.redraw({
            withTransition: false,
            withY: $$.config.zoom_rescale,
            withSubchart: false,
            withUpdateXDomain: true,
            withEventRect: false,
            withDimension: false
        });
        // update zoom transation binded to event rect
        s = d3.event.selection || $$.brush.scale.range();
        $$.main.select('.' + CLASS.eventRect).call($$.zoom.transform, d3.zoomIdentity.scale($$.width / (s[1] - s[0])).translate(-s[0], 0));
        $$.config.subchart_onbrush.call($$.api, x.orgDomain());
    };
    c3_chart_internal_fn.transformContext = function (withTransition, transitions) {
        var $$ = this,
            subXAxis;
        if (transitions && transitions.axisSubX) {
            subXAxis = transitions.axisSubX;
        } else {
            subXAxis = $$.context.select('.' + CLASS.axisX);
            if (withTransition) {
                subXAxis = subXAxis.transition();
            }
        }
        $$.context.attr("transform", $$.getTranslate('context'));
        subXAxis.attr("transform", $$.getTranslate('subx'));
    };
    c3_chart_internal_fn.getDefaultSelection = function () {
        var $$ = this,
            config = $$.config,
            selection = isFunction(config.axis_x_selection) ? config.axis_x_selection($$.getXDomain($$.data.targets)) : config.axis_x_selection;
        if ($$.isTimeSeries()) {
            selection = [$$.parseDate(selection[0]), $$.parseDate(selection[1])];
        }
        return selection;
    };

    c3_chart_internal_fn.initText = function () {
        var $$ = this;
        $$.main.select('.' + CLASS.chart).append("g").attr("class", CLASS.chartTexts);
        $$.mainText = $$.d3.selectAll([]);
    };
    c3_chart_internal_fn.updateTargetsForText = function (targets) {
        var $$ = this,
            classChartText = $$.classChartText.bind($$),
            classTexts = $$.classTexts.bind($$),
            classFocus = $$.classFocus.bind($$);
        var mainText = $$.main.select('.' + CLASS.chartTexts).selectAll('.' + CLASS.chartText).data(targets);
        var mainTextEnter = mainText.enter().append('g').attr('class', classChartText).style('opacity', 0).style("pointer-events", "none");
        mainTextEnter.append('g').attr('class', classTexts);
        mainTextEnter.merge(mainText).attr('class', function (d) {
            return classChartText(d) + classFocus(d);
        });
    };
    c3_chart_internal_fn.updateText = function (xForText, yForText, durationForExit) {
        var $$ = this,
            config = $$.config,
            barOrLineData = $$.barOrLineData.bind($$),
            classText = $$.classText.bind($$);
        var mainText = $$.main.selectAll('.' + CLASS.texts).selectAll('.' + CLASS.text).data(barOrLineData);
        var mainTextEnter = mainText.enter().append('text').attr("class", classText).attr('text-anchor', function (d) {
            return config.axis_rotated ? d.value < 0 ? 'end' : 'start' : 'middle';
        }).style("stroke", 'none').attr('x', xForText).attr('y', yForText).style("fill", function (d) {
            return $$.color(d);
        }).style("fill-opacity", 0);
        $$.mainText = mainTextEnter.merge(mainText).text(function (d, i, j) {
            return $$.dataLabelFormat(d.id)(d.value, d.id, i, j);
        });
        mainText.exit().transition().duration(durationForExit).style('fill-opacity', 0).remove();
    };
    c3_chart_internal_fn.redrawText = function (xForText, yForText, forFlow, withTransition, transition) {
        return [(withTransition ? this.mainText.transition(transition) : this.mainText).attr('x', xForText).attr('y', yForText).style("fill", this.color).style("fill-opacity", forFlow ? 0 : this.opacityForText.bind(this))];
    };
    c3_chart_internal_fn.getTextRect = function (text, cls, element) {
        var dummy = this.d3.select('body').append('div').classed('c3', true),
            svg = dummy.append("svg").style('visibility', 'hidden').style('position', 'fixed').style('top', 0).style('left', 0),
            font = this.d3.select(element).style('font'),
            rect;
        svg.selectAll('.dummy').data([text]).enter().append('text').classed(cls ? cls : "", true).style('font', font).text(text).each(function () {
            rect = this.getBoundingClientRect();
        });
        dummy.remove();
        return rect;
    };
    c3_chart_internal_fn.generateXYForText = function (areaIndices, barIndices, lineIndices, forX) {
        var $$ = this,
            getAreaPoints = $$.generateGetAreaPoints(areaIndices, false),
            getBarPoints = $$.generateGetBarPoints(barIndices, false),
            getLinePoints = $$.generateGetLinePoints(lineIndices, false),
            getter = forX ? $$.getXForText : $$.getYForText;
        return function (d, i) {
            var getPoints = $$.isAreaType(d) ? getAreaPoints : $$.isBarType(d) ? getBarPoints : getLinePoints;
            return getter.call($$, getPoints(d, i), d, this);
        };
    };
    c3_chart_internal_fn.getXForText = function (points, d, textElement) {
        var $$ = this,
            box = textElement.getBoundingClientRect(),
            xPos,
            padding;
        if ($$.config.axis_rotated) {
            padding = $$.isBarType(d) ? 4 : 6;
            xPos = points[2][1] + padding * (d.value < 0 ? -1 : 1);
        } else {
            xPos = $$.hasType('bar') ? (points[2][0] + points[0][0]) / 2 : points[0][0];
        }
        // show labels regardless of the domain if value is null
        if (d.value === null) {
            if (xPos > $$.width) {
                xPos = $$.width - box.width;
            } else if (xPos < 0) {
                xPos = 4;
            }
        }
        return xPos;
    };
    c3_chart_internal_fn.getYForText = function (points, d, textElement) {
        var $$ = this,
            box = textElement.getBoundingClientRect(),
            yPos;
        if ($$.config.axis_rotated) {
            yPos = (points[0][0] + points[2][0] + box.height * 0.6) / 2;
        } else {
            yPos = points[2][1];
            if (d.value < 0 || d.value === 0 && !$$.hasPositiveValue) {
                yPos += box.height;
                if ($$.isBarType(d) && $$.isSafari()) {
                    yPos -= 3;
                } else if (!$$.isBarType(d) && $$.isChrome()) {
                    yPos += 3;
                }
            } else {
                yPos += $$.isBarType(d) ? -3 : -6;
            }
        }
        // show labels regardless of the domain if value is null
        if (d.value === null && !$$.config.axis_rotated) {
            if (yPos < box.height) {
                yPos = box.height;
            } else if (yPos > this.height) {
                yPos = this.height - 4;
            }
        }
        return yPos;
    };

    c3_chart_internal_fn.initTitle = function () {
        var $$ = this;
        $$.title = $$.svg.append("text").text($$.config.title_text).attr("class", $$.CLASS.title);
    };
    c3_chart_internal_fn.redrawTitle = function () {
        var $$ = this;
        $$.title.attr("x", $$.xForTitle.bind($$)).attr("y", $$.yForTitle.bind($$));
    };
    c3_chart_internal_fn.xForTitle = function () {
        var $$ = this,
            config = $$.config,
            position = config.title_position || 'left',
            x;
        if (position.indexOf('right') >= 0) {
            x = $$.currentWidth - $$.getTextRect($$.title.node().textContent, $$.CLASS.title, $$.title.node()).width - config.title_padding.right;
        } else if (position.indexOf('center') >= 0) {
            x = ($$.currentWidth - $$.getTextRect($$.title.node().textContent, $$.CLASS.title, $$.title.node()).width) / 2;
        } else {
            // left
            x = config.title_padding.left;
        }
        return x;
    };
    c3_chart_internal_fn.yForTitle = function () {
        var $$ = this;
        return $$.config.title_padding.top + $$.getTextRect($$.title.node().textContent, $$.CLASS.title, $$.title.node()).height;
    };
    c3_chart_internal_fn.getTitlePadding = function () {
        var $$ = this;
        return $$.yForTitle() + $$.config.title_padding.bottom;
    };

    c3_chart_internal_fn.initTooltip = function () {
        var $$ = this,
            config = $$.config,
            i;
        $$.tooltip = $$.selectChart.style("position", "relative").append("div").attr('class', CLASS.tooltipContainer).style("position", "absolute").style("pointer-events", "none").style("display", "none");
        // Show tooltip if needed
        if (config.tooltip_init_show) {
            if ($$.isTimeSeries() && isString(config.tooltip_init_x)) {
                config.tooltip_init_x = $$.parseDate(config.tooltip_init_x);
                for (i = 0; i < $$.data.targets[0].values.length; i++) {
                    if ($$.data.targets[0].values[i].x - config.tooltip_init_x === 0) {
                        break;
                    }
                }
                config.tooltip_init_x = i;
            }
            $$.tooltip.html(config.tooltip_contents.call($$, $$.data.targets.map(function (d) {
                return $$.addName(d.values[config.tooltip_init_x]);
            }), $$.axis.getXAxisTickFormat(), $$.getYFormat($$.hasArcType()), $$.color));
            $$.tooltip.style("top", config.tooltip_init_position.top).style("left", config.tooltip_init_position.left).style("display", "block");
        }
    };
    c3_chart_internal_fn.getTooltipSortFunction = function () {
        var $$ = this,
            config = $$.config;

        if (config.data_groups.length === 0 || config.tooltip_order !== undefined) {
            // if data are not grouped or if an order is specified
            // for the tooltip values we sort them by their values

            var order = config.tooltip_order;
            if (order === undefined) {
                order = config.data_order;
            }

            var valueOf = function valueOf(obj) {
                return obj ? obj.value : null;
            };

            // if data are not grouped, we sort them by their value
            if (isString(order) && order.toLowerCase() === 'asc') {
                return function (a, b) {
                    return valueOf(a) - valueOf(b);
                };
            } else if (isString(order) && order.toLowerCase() === 'desc') {
                return function (a, b) {
                    return valueOf(b) - valueOf(a);
                };
            } else if (isFunction(order)) {

                // if the function is from data_order we need
                // to wrap the returned function in order to format
                // the sorted value to the expected format

                var sortFunction = order;

                if (config.tooltip_order === undefined) {
                    sortFunction = function sortFunction(a, b) {
                        return order(a ? {
                            id: a.id,
                            values: [a]
                        } : null, b ? {
                            id: b.id,
                            values: [b]
                        } : null);
                    };
                }

                return sortFunction;
            } else if (isArray(order)) {
                return function (a, b) {
                    return order.indexOf(a.id) - order.indexOf(b.id);
                };
            }
        } else {
            // if data are grouped, we follow the order of grouped targets
            var ids = $$.orderTargets($$.data.targets).map(function (i) {
                return i.id;
            });

            // if it was either asc or desc we need to invert the order
            // returned by orderTargets
            if ($$.isOrderAsc() || $$.isOrderDesc()) {
                ids = ids.reverse();
            }

            return function (a, b) {
                return ids.indexOf(a.id) - ids.indexOf(b.id);
            };
        }
    };
    c3_chart_internal_fn.getTooltipContent = function (d, defaultTitleFormat, defaultValueFormat, color) {
        var $$ = this,
            config = $$.config,
            titleFormat = config.tooltip_format_title || defaultTitleFormat,
            nameFormat = config.tooltip_format_name || function (name) {
            return name;
        },
            valueFormat = config.tooltip_format_value || defaultValueFormat,
            text,
            i,
            title,
            value,
            name,
            bgcolor;

        var tooltipSortFunction = this.getTooltipSortFunction();
        if (tooltipSortFunction) {
            d.sort(tooltipSortFunction);
        }

        for (i = 0; i < d.length; i++) {
            if (!(d[i] && (d[i].value || d[i].value === 0))) {
                continue;
            }

            if (!text) {
                title = sanitise(titleFormat ? titleFormat(d[i].x) : d[i].x);
                text = "<table class='" + $$.CLASS.tooltip + "'>" + (title || title === 0 ? "<tr><th colspan='2'>" + title + "</th></tr>" : "");
            }

            value = sanitise(valueFormat(d[i].value, d[i].ratio, d[i].id, d[i].index, d));
            if (value !== undefined) {
                // Skip elements when their name is set to null
                if (d[i].name === null) {
                    continue;
                }
                name = sanitise(nameFormat(d[i].name, d[i].ratio, d[i].id, d[i].index));
                bgcolor = $$.levelColor ? $$.levelColor(d[i].value) : color(d[i].id);

                text += "<tr class='" + $$.CLASS.tooltipName + "-" + $$.getTargetSelectorSuffix(d[i].id) + "'>";
                text += "<td class='name'><span style='background-color:" + bgcolor + "'></span>" + name + "</td>";
                text += "<td class='value'>" + value + "</td>";
                text += "</tr>";
            }
        }
        return text + "</table>";
    };
    c3_chart_internal_fn.tooltipPosition = function (dataToShow, tWidth, tHeight, element) {
        var $$ = this,
            config = $$.config,
            d3 = $$.d3;
        var svgLeft, tooltipLeft, tooltipRight, tooltipTop, chartRight;
        var forArc = $$.hasArcType(),
            mouse = d3.mouse(element);
        // Determin tooltip position
        if (forArc) {
            tooltipLeft = ($$.width - ($$.isLegendRight ? $$.getLegendWidth() : 0)) / 2 + mouse[0];
            tooltipTop = ($$.hasType('gauge') ? $$.height : $$.height / 2) + mouse[1] + 20;
        } else {
            svgLeft = $$.getSvgLeft(true);
            if (config.axis_rotated) {
                tooltipLeft = svgLeft + mouse[0] + 100;
                tooltipRight = tooltipLeft + tWidth;
                chartRight = $$.currentWidth - $$.getCurrentPaddingRight();
                tooltipTop = $$.x(dataToShow[0].x) + 20;
            } else {
                tooltipLeft = svgLeft + $$.getCurrentPaddingLeft(true) + $$.x(dataToShow[0].x) + 20;
                tooltipRight = tooltipLeft + tWidth;
                chartRight = svgLeft + $$.currentWidth - $$.getCurrentPaddingRight();
                tooltipTop = mouse[1] + 15;
            }

            if (tooltipRight > chartRight) {
                // 20 is needed for Firefox to keep tooltip width
                tooltipLeft -= tooltipRight - chartRight + 20;
            }
            if (tooltipTop + tHeight > $$.currentHeight) {
                tooltipTop -= tHeight + 30;
            }
        }
        if (tooltipTop < 0) {
            tooltipTop = 0;
        }
        return { top: tooltipTop, left: tooltipLeft };
    };
    c3_chart_internal_fn.showTooltip = function (selectedData, element) {
        var $$ = this,
            config = $$.config;
        var tWidth, tHeight, position;
        var forArc = $$.hasArcType(),
            dataToShow = selectedData.filter(function (d) {
            return d && isValue(d.value);
        }),
            positionFunction = config.tooltip_position || c3_chart_internal_fn.tooltipPosition;
        if (dataToShow.length === 0 || !config.tooltip_show) {
            return;
        }
        $$.tooltip.html(config.tooltip_contents.call($$, selectedData, $$.axis.getXAxisTickFormat(), $$.getYFormat(forArc), $$.color)).style("display", "block");

        // Get tooltip dimensions
        tWidth = $$.tooltip.property('offsetWidth');
        tHeight = $$.tooltip.property('offsetHeight');

        position = positionFunction.call(this, dataToShow, tWidth, tHeight, element);
        // Set tooltip
        $$.tooltip.style("top", position.top + "px").style("left", position.left + 'px');
    };
    c3_chart_internal_fn.hideTooltip = function () {
        this.tooltip.style("display", "none");
    };

    c3_chart_internal_fn.setTargetType = function (targetIds, type) {
        var $$ = this,
            config = $$.config;
        $$.mapToTargetIds(targetIds).forEach(function (id) {
            $$.withoutFadeIn[id] = type === config.data_types[id];
            config.data_types[id] = type;
        });
        if (!targetIds) {
            config.data_type = type;
        }
    };
    c3_chart_internal_fn.hasType = function (type, targets) {
        var $$ = this,
            types = $$.config.data_types,
            has = false;
        targets = targets || $$.data.targets;
        if (targets && targets.length) {
            targets.forEach(function (target) {
                var t = types[target.id];
                if (t && t.indexOf(type) >= 0 || !t && type === 'line') {
                    has = true;
                }
            });
        } else if (Object.keys(types).length) {
            Object.keys(types).forEach(function (id) {
                if (types[id] === type) {
                    has = true;
                }
            });
        } else {
            has = $$.config.data_type === type;
        }
        return has;
    };
    c3_chart_internal_fn.hasArcType = function (targets) {
        return this.hasType('pie', targets) || this.hasType('donut', targets) || this.hasType('gauge', targets);
    };
    c3_chart_internal_fn.isLineType = function (d) {
        var config = this.config,
            id = isString(d) ? d : d.id;
        return !config.data_types[id] || ['line', 'spline', 'area', 'area-spline', 'step', 'area-step'].indexOf(config.data_types[id]) >= 0;
    };
    c3_chart_internal_fn.isStepType = function (d) {
        var id = isString(d) ? d : d.id;
        return ['step', 'area-step'].indexOf(this.config.data_types[id]) >= 0;
    };
    c3_chart_internal_fn.isSplineType = function (d) {
        var id = isString(d) ? d : d.id;
        return ['spline', 'area-spline'].indexOf(this.config.data_types[id]) >= 0;
    };
    c3_chart_internal_fn.isAreaType = function (d) {
        var id = isString(d) ? d : d.id;
        return ['area', 'area-spline', 'area-step'].indexOf(this.config.data_types[id]) >= 0;
    };
    c3_chart_internal_fn.isBarType = function (d) {
        var id = isString(d) ? d : d.id;
        return this.config.data_types[id] === 'bar';
    };
    c3_chart_internal_fn.isScatterType = function (d) {
        var id = isString(d) ? d : d.id;
        return this.config.data_types[id] === 'scatter';
    };
    c3_chart_internal_fn.isPieType = function (d) {
        var id = isString(d) ? d : d.id;
        return this.config.data_types[id] === 'pie';
    };
    c3_chart_internal_fn.isGaugeType = function (d) {
        var id = isString(d) ? d : d.id;
        return this.config.data_types[id] === 'gauge';
    };
    c3_chart_internal_fn.isDonutType = function (d) {
        var id = isString(d) ? d : d.id;
        return this.config.data_types[id] === 'donut';
    };
    c3_chart_internal_fn.isArcType = function (d) {
        return this.isPieType(d) || this.isDonutType(d) || this.isGaugeType(d);
    };
    c3_chart_internal_fn.lineData = function (d) {
        return this.isLineType(d) ? [d] : [];
    };
    c3_chart_internal_fn.arcData = function (d) {
        return this.isArcType(d.data) ? [d] : [];
    };
    /* not used
     function scatterData(d) {
     return isScatterType(d) ? d.values : [];
     }
     */
    c3_chart_internal_fn.barData = function (d) {
        return this.isBarType(d) ? d.values : [];
    };
    c3_chart_internal_fn.lineOrScatterData = function (d) {
        return this.isLineType(d) || this.isScatterType(d) ? d.values : [];
    };
    c3_chart_internal_fn.barOrLineData = function (d) {
        return this.isBarType(d) || this.isLineType(d) ? d.values : [];
    };

    c3_chart_internal_fn.isSafari = function () {
        var ua = window.navigator.userAgent;
        return ua.indexOf('Safari') >= 0 && ua.indexOf('Chrome') < 0;
    };
    c3_chart_internal_fn.isChrome = function () {
        var ua = window.navigator.userAgent;
        return ua.indexOf('Chrome') >= 0;
    };

    c3_chart_internal_fn.initZoom = function () {
        var $$ = this,
            d3 = $$.d3,
            config = $$.config,
            startEvent;

        $$.zoom = d3.zoom().on("start", function () {
            var e = d3.event.sourceEvent;
            if (e && e.type === "brush") {
                return;
            }
            startEvent = e;
            config.zoom_onzoomstart.call($$.api, e);
        }).on("zoom", function () {
            var e = d3.event.sourceEvent;
            if (e && e.type === "brush") {
                return;
            }
            $$.redrawForZoom.call($$);
        }).on('end', function () {
            var e = d3.event.sourceEvent;
            if (e && e.type === "brush") {
                return;
            }
            // if click, do nothing. otherwise, click interaction will be canceled.
            if (e && startEvent.clientX === e.clientX && startEvent.clientY === e.clientY) {
                return;
            }
            config.zoom_onzoomend.call($$.api, $$.x.orgDomain());
        });

        $$.zoom.updateDomain = function () {
            if (d3.event && d3.event.transform) {
                $$.x.domain(d3.event.transform.rescaleX($$.subX).domain());
            }
            return this;
        };
        $$.zoom.updateExtent = function () {
            this.scaleExtent([1, Infinity]).translateExtent([[0, 0], [$$.width, $$.height]]).extent([[0, 0], [$$.width, $$.height]]);
            return this;
        };
        $$.zoom.update = function () {
            return this.updateExtent().updateDomain();
        };

        return $$.zoom.updateExtent();
    };
    c3_chart_internal_fn.zoomTransform = function (range) {
        var $$ = this,
            s = [$$.x(range[0]), $$.x(range[1])];
        return $$.d3.zoomIdentity.scale($$.width / (s[1] - s[0])).translate(-s[0], 0);
    };

    c3_chart_internal_fn.getZoomDomain = function () {
        var $$ = this,
            config = $$.config,
            d3 = $$.d3,
            min = d3.min([$$.orgXDomain[0], config.zoom_x_min]),
            max = d3.max([$$.orgXDomain[1], config.zoom_x_max]);
        return [min, max];
    };
    c3_chart_internal_fn.redrawForZoom = function () {
        var $$ = this,
            d3 = $$.d3,
            config = $$.config,
            zoom = $$.zoom,
            x = $$.x;
        if (!config.zoom_enabled) {
            return;
        }
        if ($$.filterTargetsToShow($$.data.targets).length === 0) {
            return;
        }

        zoom.update();

        if ($$.isCategorized() && x.orgDomain()[0] === $$.orgXDomain[0]) {
            x.domain([$$.orgXDomain[0] - 1e-10, x.orgDomain()[1]]);
        }
        $$.redraw({
            withTransition: false,
            withY: config.zoom_rescale,
            withSubchart: false,
            withEventRect: false,
            withDimension: false
        });
        if (d3.event.sourceEvent && d3.event.sourceEvent.type === 'mousemove') {
            $$.cancelClick = true;
        }
        config.zoom_onzoom.call($$.api, x.orgDomain());
    };

    return c3;

})));