(function (window) {
    'use strict';

    /*global define, module, exports, require */

    var c3 = { version: "0.3.0" };

    var c3_chart_fn, c3_chart_internal_fn;

    function Chart(config) {
        var $$ = this.internal = new ChartInternal(config, this);
        $$[loadConfig](config);
        $$[init]();
    }

    function ChartInternal(config, api) {
        var $$ = this;
        $$.d3 = window.d3 ? window.d3 : typeof require !== 'undefined' ? require("d3") : undefined;
        $$.api = api;
        $$.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;

    var CSS_CLASS = 'class',
        CSS_OPACITY = 'opacity',
        CSS_TRANSFORM = 'transform',
        CSS_FILL_OPACITY = 'fill-opacity',
        CSS_TEXT_ANCHOR = 'text-anchor',
        CSS_VISIBILITY = 'visibility',
        CSS_POINTER_EVENTS = 'pointer-events';

    var TYPE_BAR = 'bar',
        //TYPE_LINE = 'line',
        TYPE_AREA = 'area',
        TYPE_SCATTER = 'scatter',
        TYPE_PIE = 'pie',
        TYPE_DONUT = 'donut',
        TYPE_GAUGE = 'gauge';


    /**
     *  c3.config.js
     */
    var __bindto = 'bindto',
        __size_width = 'size_width',
        __size_height = 'size_height',
        __padding_left = 'padding_left',
        __padding_right = 'padding_right',
        __padding_top = 'padding_top',
        __padding_bottom = 'padding_bottom',
        __zoom_enabled = 'zoom_enabled',
        __zoom_extent = 'zoom_extent',
        __zoom_privileged = 'zoom_privileged',
        __zoom_onzoom = 'zoom_onzoom',
        __interaction_enabled = 'interaction_enabled',
        __onmouseover = 'onmouseover',
        __onmouseout = 'onmouseout',
        __onresize = 'onresize',
        __onresized = 'onresized',
        __transition_duration = 'transition_duration',
        __data_x = 'data_x',
        __data_xs = 'data_xs',
        __data_x_format = 'data_x_format',
        __data_x_localtime = 'data_x_localtime',
        __data_id_converter = 'data_id_converter',
        __data_names = 'data_names',
        __data_classes = 'data_classes',
        __data_groups = 'data_groups',
        __data_axes = 'data_axes',
        __data_type = 'data_type',
        __data_types = 'data_types',
        __data_labels = 'data_labels',
        __data_order = 'data_order',
        __data_regions = 'data_regions',
        __data_color = 'data_color',
        __data_colors = 'data_colors',
        __data_hide = 'data_hide',
        __data_filter = 'data_filter',
        __data_selection_enabled = 'data_selection_enabled',
        __data_selection_grouped = 'data_selection_grouped',
        __data_selection_isselectable = 'data_selection_isselectable',
        __data_selection_multiple = 'data_selection_multiple',
        __data_onclick = 'data_onclick',
        __data_onmouseover = 'data_onmouseover',
        __data_onmouseout = 'data_onmouseout',
        __data_onselected = 'data_onselected',
        __data_onunselected = 'data_onunselected',
        __data_ondragstart = 'data_ondragstart',
        __data_ondragend = 'data_ondragend',
        __data_url = 'data_url',
        __data_json = 'data_json',
        __data_rows = 'data_rows',
        __data_columns = 'data_columns',
        __data_mimeType = 'data_mimeType',
        __data_keys = 'data_keys',
        __data_empty_label_text = 'data_empty_label_text',
        __subchart_show = 'subchart_show',
        __subchart_size_height = 'subchart_size_height',
        __subchart_onbrush = 'subchart_onbrush',
        __color_pattern = 'color_pattern',
        __color_threshold  = 'color_threshold',
        __legend_show = 'legend_show',
        __legend_position = 'legend_position',
        __legend_inset_anchor = 'legend_inset_anchor',
        __legend_inset_x = 'legend_inset_x',
        __legend_inset_y = 'legend_inset_y',
        __legend_inset_step = 'legend_inset_step',
        __legend_item_onclick = 'legend_item_onclick',
        __legend_item_onmouseover = 'legend_item_onmouseover',
        __legend_item_onmouseout = 'legend_item_onmouseout',
        __legend_equally = 'legend_equally',
        __axis_rotated = 'axis_rotated',
        __axis_x_show = 'axis_x_show',
        __axis_x_type = 'axis_x_type',
        __axis_x_localtime = 'axis_x_localtime',
        __axis_x_categories = 'axis_x_categories',
        __axis_x_tick_centered = 'axis_x_tick_centered',
        __axis_x_tick_format = 'axis_x_tick_format',
        __axis_x_tick_culling = 'axis_x_tick_culling',
        __axis_x_tick_culling_max = 'axis_x_tick_culling_max',
        __axis_x_tick_count = 'axis_x_tick_count',
        __axis_x_tick_fit = 'axis_x_tick_fit',
        __axis_x_tick_values = 'axis_x_tick_values',
        __axis_x_tick_rotate = 'axis_x_tick_rotate',
        __axis_x_tick_outer = 'axis_x_tick_outer',
        __axis_x_max = 'axis_x_max',
        __axis_x_min = 'axis_x_min',
        __axis_x_padding = 'axis_x_padding',
        __axis_x_height = 'axis_x_height',
        __axis_x_default = 'axis_x_default',
        __axis_x_label = 'axis_x_label',
        __axis_y_show = 'axis_y_show',
        __axis_y_max = 'axis_y_max',
        __axis_y_min = 'axis_y_min',
        __axis_y_center = 'axis_y_center',
        __axis_y_label = 'axis_y_label',
        __axis_y_inner = 'axis_y_inner',
        __axis_y_tick_format = 'axis_y_tick_format',
        __axis_y_tick_outer = 'axis_y_tick_outer',
        __axis_y_padding = 'axis_y_padding',
        __axis_y_ticks = 'axis_y_ticks',
        __axis_y2_show = 'axis_y2_show',
        __axis_y2_max = 'axis_y2_max',
        __axis_y2_min = 'axis_y2_min',
        __axis_y2_center = 'axis_y2_center',
        __axis_y2_label = 'axis_y2_label',
        __axis_y2_inner = 'axis_y2_inner',
        __axis_y2_tick_format = 'axis_y2_tick_format',
        __axis_y2_tick_outer = 'axis_y2_tick_outer',
        __axis_y2_padding = 'axis_y2_padding',
        __axis_y2_ticks = 'axis_y2_ticks',
        __grid_x_show = 'grid_x_show',
        __grid_x_type = 'grid_x_type',
        __grid_x_lines = 'grid_x_lines',
        __grid_y_show = 'grid_y_show',
        __grid_y_lines = 'grid_y_lines',
        __grid_y_ticks = 'grid_y_ticks',
        __grid_focus_show = 'grid_focus_show',
        __point_show = 'point_show',
        __point_r = 'point_r',
        __point_focus_expand_enabled = 'point_focus_expand_enabled',
        __point_focus_expand_r = 'point_focus_expand_r',
        __point_select_r = 'point_select_r',
        __line_connect_null = 'line_connect_null',
        __bar_width = 'bar_width',
        __bar_width_ratio = 'bar_width_ratio',
        __bar_width_max = 'bar_width_max',
        __bar_zerobased = 'bar_zerobased',
        __area_zerobased = 'area_zerobased',
        __pie_label_show = 'pie_label_show',
        __pie_label_format = 'pie_label_format',
        __pie_label_threshold = 'pie_label_threshold',
        __pie_sort = 'pie_sort',
        __pie_expand = 'pie_expand',
        __gauge_label_show = 'gauge_label_show',
        __gauge_label_format = 'gauge_label_format',
        __gauge_expand = 'gauge_expand',
        __gauge_min = 'gauge_min',
        __gauge_max = 'gauge_max',
        __gauge_units = 'gauge_units',
        __gauge_width = 'gauge_width',
        __donut_label_show = 'donut_label_show',
        __donut_label_format = 'donut_label_format',
        __donut_label_threshold = 'donut_label_threshold',
        __donut_width = 'donut_width',
        __donut_sort = 'donut_sort',
        __donut_expand = 'donut_expand',
        __donut_title = 'donut_title',
        __regions = 'regions',
        __tooltip_show = 'tooltip_show',
        __tooltip_grouped = 'tooltip_grouped',
        __tooltip_format_title = 'tooltip_format_title',
        __tooltip_format_name = 'tooltip_format_name',
        __tooltip_format_value = 'tooltip_format_value',
        __tooltip_contents = 'tooltip_contents',
        __tooltip_init_show = 'tooltip_init_show',
        __tooltip_init_x = 'tooltip_init_x',
        __tooltip_init_position = 'tooltip_init_position';

    var config = c3_chart_internal_fn.config = {};
    config[__bindto] = '#chart';
    config[__size_width] = undefined;
    config[__size_height] = undefined;

    config[__padding_left] = undefined;
    config[__padding_right] = undefined;
    config[__padding_top] = undefined;
    config[__padding_bottom] = undefined;

    config[__zoom_enabled] = false;
    config[__zoom_extent] = undefined;
    config[__zoom_privileged] = false;
    config[__zoom_onzoom] = function () {};

    config[__interaction_enabled] = true;

    config[__onmouseover] = function () {};
    config[__onmouseout] = function () {};
    config[__onresize] = function () {};
    config[__onresized] = function () {};

    config[__transition_duration] = 350;

    config[__data_x] = undefined;
    config[__data_xs] = {};
    config[__data_x_format] = '%Y-%m-%d';
    config[__data_x_localtime] = true;
    config[__data_id_converter] = function (id) { return id; };
    config[__data_names] = {};
    config[__data_classes] = {};
    config[__data_groups] = [];
    config[__data_axes] = {};
    config[__data_type] = undefined;
    config[__data_types] = {};
    config[__data_labels] = {};
    config[__data_order] = 'desc';
    config[__data_regions] = {};
    config[__data_color] = undefined;
    config[__data_colors] = {};
    config[__data_hide] = false;
    config[__data_filter] = undefined;
    config[__data_selection_enabled] = false;
    config[__data_selection_grouped] = false;
    config[__data_selection_isselectable] = function () { return true; };
    config[__data_selection_multiple] = true;
    config[__data_onclick] = function () {};
    config[__data_onmouseover] = function () {};
    config[__data_onmouseout] = function () {};
    config[__data_onselected] = function () {};
    config[__data_onunselected] = function () {};
    config[__data_ondragstart] = function () {};
    config[__data_ondragend] = function () {};
    config[__data_url] = undefined;
    config[__data_json] = undefined;
    config[__data_rows] = undefined;
    config[__data_columns] = undefined;
    config[__data_mimeType] = undefined;
    config[__data_keys] = undefined;

    // configuration for no plot-able data supplied.
    config[__data_empty_label_text] = "";

    // subchart
    config[__subchart_show] = false;
    config[__subchart_size_height] = 60;
    config[__subchart_onbrush] = function () {};

    // color
    config[__color_pattern] = [];
    config[__color_threshold] = {};

    // legend
    config[__legend_show] = true;
    config[__legend_position] = 'bottom';
    config[__legend_inset_anchor] = 'top-left';
    config[__legend_inset_x] = 10;
    config[__legend_inset_y] = 0;
    config[__legend_inset_step] = undefined;
    config[__legend_item_onclick] = undefined;
    config[__legend_item_onmouseover] = undefined;
    config[__legend_item_onmouseout] = undefined;
    config[__legend_equally] = false;

    // axis
    config[__axis_rotated] = false;
    config[__axis_x_show] = true;
    config[__axis_x_type] = 'indexed';
    config[__axis_x_localtime] = true;
    config[__axis_x_categories] = [];
    config[__axis_x_tick_centered] = false;
    config[__axis_x_tick_format] = undefined;
    config[__axis_x_tick_culling] = {};
    config[__axis_x_tick_culling_max] = 10;
    config[__axis_x_tick_count] = undefined;
    config[__axis_x_tick_fit] = true;
    config[__axis_x_tick_values] = null;
    config[__axis_x_tick_rotate] = undefined;
    config[__axis_x_tick_outer] = true;
    config[__axis_x_max] = null;
    config[__axis_x_min] = null;
    config[__axis_x_padding] = {};
    config[__axis_x_height] = undefined;
    config[__axis_x_default] = undefined;
    config[__axis_x_label] = {};
    config[__axis_y_show] = true;
    config[__axis_y_max] = undefined;
    config[__axis_y_min] = undefined;
    config[__axis_y_center] = undefined;
    config[__axis_y_label] = {};
    config[__axis_y_inner] = false;
    config[__axis_y_tick_format] = undefined;
    config[__axis_y_tick_outer] = true;
    config[__axis_y_padding] = undefined;
    config[__axis_y_ticks] = 10;
    config[__axis_y2_show] = false;
    config[__axis_y2_max] = undefined;
    config[__axis_y2_min] = undefined;
    config[__axis_y2_center] = undefined;
    config[__axis_y2_label] = {};
    config[__axis_y2_inner] = false;
    config[__axis_y2_tick_format] = undefined;
    config[__axis_y2_tick_outer] = true;
    config[__axis_y2_padding] = undefined;
    config[__axis_y2_ticks] = 10;

    // grid
    config[__grid_x_show] = false;
    config[__grid_x_type] = 'tick';
    config[__grid_x_lines] = [];
    config[__grid_y_show] = false;
    // not used
    // grid_y_type: {}, 'tick'),
    config[__grid_y_lines] = [];
    config[__grid_y_ticks] = 10;
    config[__grid_focus_show] = true;

    // point - point of each data
    config[__point_show] = true;
    config[__point_r] = 2.5;
    config[__point_focus_expand_enabled] = true;
    config[__point_focus_expand_r] = undefined;
    config[__point_select_r] = undefined;

    config[__line_connect_null] = false;

    // bar
    config[__bar_width] = undefined;
    config[__bar_width_ratio] = 0.6;
    config[__bar_width_max] = undefined;
    config[__bar_zerobased] = true;

    // area
    config[__area_zerobased] = true;

    // pie
    config[__pie_label_show] = true;
    config[__pie_label_format] = undefined;
    config[__pie_label_threshold] = 0.05;
    config[__pie_sort] = true;
    config[__pie_expand] = true;

    // gauge
    config[__gauge_label_show] = true;
    config[__gauge_label_format] = undefined;
    config[__gauge_expand] = true;
    config[__gauge_min] = 0;
    config[__gauge_max] = 100;
    config[__gauge_units] = undefined;
    config[__gauge_width] = undefined;

    // donut
    config[__donut_label_show] = true;
    config[__donut_label_format] = undefined;
    config[__donut_label_threshold] = 0.05;
    config[__donut_width] = undefined;
    config[__donut_sort] = true;
    config[__donut_expand] = true;
    config[__donut_title] = "";

    // region - region to change style
    config[__regions] = [];

    // tooltip - show when mouseover on each data
    config[__tooltip_show] = true;
    config[__tooltip_grouped] = true;
    config[__tooltip_format_title] = undefined;
    config[__tooltip_format_name] = undefined;
    config[__tooltip_format_value] = undefined;
    config[__tooltip_contents] = 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;
        for (i = 0; i < d.length; i++) {
            if (! (d[i] && (d[i].value || d[i].value === 0))) { continue; }

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

            name = nameFormat(d[i].name);
            value = valueFormat(d[i].value, d[i].ratio, d[i].id, d[i].index);
            bgcolor = $$[levelColor] ? $$[levelColor](d[i].value) : color(d[i].id);

            text += "<tr class='" + CLASS[tooltipName] + "-" + 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>";
    };
    config[__tooltip_init_show] = false;
    config[__tooltip_init_x] = 0;
    config[__tooltip_init_position] = {top: '0px', left: '50px'};

    var loadConfig = 'loadConfig';
    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 && 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;
            }
        });
    };




    var initZoom = 'initZoom';// should be define in c3.zoom.js
    c3_chart_internal_fn[initZoom] = function () {
        var $$ = this, d3 = $$.d3, config = $$.config;
        $$.zoom = d3.behavior.zoom()
            .on("zoomstart", function () {
                $$.zoom.altDomain = d3.event.sourceEvent.altKey ? $$.x.orgDomain() : null;
            })
            .on("zoom", $$[redrawForZoom]);
        $$.zoom.scale = function (scale) {
            return config[__axis_rotated] ? this[y](scale) : this[x](scale);
        };
        $$.zoom.orgScaleExtent = function () {
            var extent = config[__zoom_extent] ? config[__zoom_extent] : [1, 10];
            return [extent[0], Math.max($$[getMaxDataCount]() / extent[1], extent[1])];
        };
        $$.zoom.updateScaleExtent = function () {
            var ratio = diffDomain($$.x.orgDomain()) / diffDomain($$.orgXDomain),
                extent = this.orgScaleExtent();
            this.scaleExtent([extent[0] * ratio, extent[1] * ratio]);
            return this;
        };
    };


    var init = 'init';
    c3_chart_internal_fn[init] = function () {
        var $$ = this, config = $$.config;
        if (config[__data_url]) {
            $$[convertUrlToData](config[__data_url], config[__data_mimeType], config[__data_keys], $$[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.');
        }
    };

    var initWithData = 'initWithData',
        color = 'color',
        isCustomX = 'isCustomX',
        clipId = 'clipId',
        clipIdForXAxis = 'clipIdForXAxis',
        clipIdForYAxis = 'clipIdForYAxis',
        clipPath = 'clipPath',
        clipPathForXAxis = 'clipPathForXAxis',
        clipPathForYAxis = 'clipPathForYAxis',
        isTimeSeries = 'isTimeSeries',
        isCategorized = 'isCategorized',
        dragStart = 'dragStart',
        dragging = 'dragging',
        cancelClick = 'cancelClick',
        mouseover = 'mouseover',
        transiting = 'transiting',
        defaultColorPattern = 'defaultColorPattern',
        levelColor = 'levelColor',
        dataTimeFormat = 'dataTimeFormat',
        axisTimeFormat = 'axisTimeFormat',
        defaultAxisTimeFormat = 'defaultAxisTimeFormat',
        hiddenTargetIds = 'hiddenTargetIds',
        hiddenLegendIds = 'hiddenLegendIds',
        xOrient = 'xOrient',
        yOrient = 'yOrient',
        y2Orient = 'y2Orient',
        subXOrient = 'subXOrient',
        translate = 'translate',
        isLegendRight = 'isLegendRight',
        isLegendInset = 'isLegendInset',
        isLegendTop = 'isLegendTop',
        isLegendLeft = 'isLegendLeft',
        legendStep = 'legendStep',
        legendItemWidth = 'legendItemWidth',
        legendItemHeight = 'legendItemHeight',
        legendOpacityForHidden = 'legendOpacityForHidden',
        currentMaxTickWidth = 'currentMaxTickWidth',
        rotated_padding_left = 'rotated_padding_left',
        rotated_padding_right = 'rotated_padding_right',
        rotated_padding_top = 'rotated_padding_top',
        withoutFadeIn = 'withoutFadeIn';
    c3_chart_internal_fn[initWithData] = function (data) {
        var $$ = this, d3 = $$.d3, config = $$.config;
        var main, legend, eventRect, i, binding = true;

        // MEMO: clipId needs to be unique because it conflicts when multiple charts exist
        $$[clipId] = "c3-" + (+new Date()) + '-clip',
        $$[clipIdForXAxis] = $$[clipId] + '-xaxis',
        $$[clipIdForYAxis] = $$[clipId] + '-yaxis',
        $$[clipPath] = $$[getClipPath]($$.clipId),
        $$[clipPathForXAxis] = $$[getClipPath]($$[clipIdForXAxis]),
        $$[clipPathForYAxis] = $$[getClipPath]($$[clipIdForYAxis]);

        $$[isTimeSeries] = (config[__axis_x_type] === 'timeseries');
        $$[isCategorized] = (config[__axis_x_type].indexOf('categor') >= 0);
        $$[isCustomX] = function () { return !$$[isTimeSeries] && (config[__data_x] || notEmpty(config[__data_xs])); };

        $$[dragStart] = $$[dragging] = $$[cancelClick] = $$[mouseover] = $$[transiting] = false;

        $$[defaultColorPattern] = d3.scale.category10().range();
        $$[color] = $$[generateColor](config[__data_colors], notEmpty(config[__color_pattern]) ? config[__color_pattern] : $$[defaultColorPattern], config[__data_color]);
        $$[levelColor] = notEmpty(config[__color_threshold]) ? $$[generateLevelColor](config[__color_pattern], config[__color_threshold]) : null;

        $$[dataTimeFormat] = config[__data_x_localtime] ? d3.time.format : d3.time.format.utc;
        $$[axisTimeFormat] = config[__axis_x_localtime] ? d3.time.format : d3.time.format.utc;
        $$[defaultAxisTimeFormat] = $$[axisTimeFormat].multi([
            [".%L", function (d) { return d.getMilliseconds(); }],
            [":%S", function (d) { return d.getSeconds(); }],
            ["%I:%M", function (d) { return d.getMinutes(); }],
            ["%I %p", function (d) { return d.getHours(); }],
            ["%-m/%-d", function (d) { return d.getDay() && d.getDate() !== 1; }],
            ["%-m/%-d", function (d) { return d.getDate() !== 1; }],
            ["%-m/%-d", function (d) { return d.getMonth(); }],
            ["%Y/%-m/%-d", function () { return true; }]
        ]);

        $$[hiddenTargetIds] = [];
        $$[hiddenLegendIds] = [];

        $$[xOrient] = config[__axis_rotated] ? "left" : "bottom";
        $$[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";

        $$[translate] = {
            main : function () { return "translate(" + asHalfPixel($$.margin.left) + "," + asHalfPixel($$.margin.top) + ")"; },
            context : function () { return "translate(" + asHalfPixel($$.margin2.left) + "," + asHalfPixel($$.margin2.top) + ")"; },
            legend : function () { return "translate(" + $$.margin3.left + "," + $$.margin3.top + ")"; },
            x : function () { return "translate(0," + (config[__axis_rotated] ? 0 : $$.height) + ")"; },
            y : function () { return "translate(0," + (config[__axis_rotated] ? $$.height : 0) + ")"; },
            y2 : function () { return "translate(" + (config[__axis_rotated] ? 0 : $$.width) + "," + (config[__axis_rotated] ? 1 : 0) + ")"; },
            subx : function () { return "translate(0," + (config[__axis_rotated] ? 0 : $$.height2) + ")"; },
            arc: function () { return "translate(" + ($$.arcWidth / 2) + "," + ($$.arcHeight / 2) + ")"; }
        };

        $$[isLegendRight] = config[__legend_position] === 'right';
        $$[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;
        $$[legendItemHeight] = 0;
        $$[legendOpacityForHidden] = 0.15;

        $$[currentMaxTickWidth] = 0;

        $$[rotated_padding_left] = 30;
        $$[rotated_padding_right] = config[__axis_rotated] && !config[__axis_x_show] ? 0 : 30;
        $$[rotated_padding_top] = 5;

        $$[withoutFadeIn] = {};

        if (isFunction($$.initPie)) {
            $$[initPie]();
        }
        if (isFunction($$.initBrush)) {
            $$[initBrush]();
        } else {
            $$.axes.subx = d3.selectAll([]);
        }
        if ($$[initZoom]) { $$[initZoom](); }

        $$.selectChart = d3.select(config[__bindto]);
        if ($$.selectChart.empty()) {
            $$.selectChart = d3.select(document.createElement('div')).style(CSS_OPACITY, 0);
            $$[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]);
        }

        // when gauge, hide legend // TODO: fix
        if ($$[hasType]($$.data.targets, TYPE_GAUGE)) {
            config[__legend_show] = false;
        }

        // 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();

        // Set initialized scales to brush and zoom
        if ($$.brush) { $$.brush.scale($$.subX); }
        if (config[__zoom_enabled]) { $$.zoom.scale($$.x); }

        /*-- Basic Elements --*/

        // Define svgs
        $$.svg = $$.selectChart.append("svg")
            .style("overflow", "hidden")
            .on('mouseover', generateCall(config[__onmouseover], $$))
            .on('mouseout', generateCall(config[__onmouseout], $$));

        // Define defs
        $$.defs = $$.svg.append("defs");
        $$.defs.append("clipPath").attr("id", $$[clipId]).append("rect");
        $$.defs.append("clipPath").attr("id", $$[clipIdForXAxis]).append("rect");
        $$.defs.append("clipPath").attr("id", $$[clipIdForYAxis]).append("rect");
        $$[updateSvgSize]();

        // Define regions
        main = $$.main = $$.svg.append("g").attr(CSS_TRANSFORM, $$[translate].main);
        legend = $$.legend = $$.svg.append("g").attr(CSS_TRANSFORM, $$[translate].legend);

        if (isFunction($$.initSubchart)) {
            $$[initSubchart]();
        }

        if (!config[__legend_show]) {
            $$.legend.style(CSS_VISIBILITY, 'hidden');
            $$[hiddenLegendIds] = $$[mapToIds]($$.data.targets);
        }

        // Define tooltip
        $$.tooltip = $$.selectChart
            .style("position", "relative")
          .append("div")
            .style("position", "absolute")
            .style(CSS_POINTER_EVENTS, "none")
            .style("z-index", "10")
            .style("display", "none");

        // MEMO: call here to update legend box and tranlate for all
        // MEMO: translate will be upated by this, so transform not needed in updateLegend()
        $$[updateLegend]($$[mapToIds]($$.data.targets), {withTransform: false, withTransitionForTransform: false, withTransition: false});

        /*-- Main Region --*/

        // text when empty
        main.append("text")
            .attr(CSS_CLASS, CLASS[text] + ' ' + CLASS[empty])
            .attr(CSS_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
        main.append('g')
            .attr("clip-path", $$[clipPath])
            .attr(CSS_CLASS, CLASS[regions]);

        // Grids
        $$.grid = main.append('g')
            .attr("clip-path", $$[clipPath])
            .attr('class', CLASS[grid]);
        if (config[__grid_x_show]) {
            $$.grid.append("g").attr(CSS_CLASS, CLASS[xgrids]);
        }
        if (config[__grid_y_show]) {
            $$.grid.append('g').attr(CSS_CLASS, CLASS[ygrids]);
        }
        $$.grid.append('g').attr(CSS_CLASS, CLASS[xgridLines]);
        $$.grid.append('g').attr(CSS_CLASS, CLASS[ygridLines]);
        if (config[__grid_focus_show]) {
            $$.grid.append('g')
                .attr(CSS_CLASS, CLASS[xgridFocus])
              .append('line')
                .attr(CSS_CLASS, CLASS[xgridFocus]);
        }

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

        // Cover whole with rects for events
        eventRect = main.select('.' + CLASS[chart]).append("g")
            .attr(CSS_CLASS, CLASS[eventRects])
            .style(CSS_FILL_OPACITY, 0);

        // Define g for bar chart area
        main.select('.' + CLASS[chart]).append("g")
            .attr(CSS_CLASS, CLASS[chartBars]);

        // Define g for line chart area
        main.select('.' + CLASS[chart]).append("g")
            .attr(CSS_CLASS, CLASS[chartLines]);

        // Define g for arc chart area
        if (isFunction($$.initArc)) {
            $$[initArc]();
        }
        if (isFunction($$.initGauge)) {
            $$[initGauge]();
        }

        main.select('.' + CLASS[chart]).append("g")
            .attr(CSS_CLASS, CLASS[chartTexts]);

        // if zoom privileged, insert rect to forefront
        main.insert('rect', config[__zoom_privileged] ? null : 'g.' + CLASS[regions])
            .attr(CSS_CLASS, CLASS[zoomRect])
            .attr('width', $$.width)
            .attr('height', $$.height)
            .style(CSS_OPACITY, 0)
            .on("dblclick.zoom", null);

        // Set default extent if defined
        if (config[__axis_x_default]) {
            $$.brush.extent(!isFunction(config[__axis_x_default]) ? config[__axis_x_default] : config[__axis_x_default]($$[getXDomain]()));
        }

        // Add Axis
        $$.axes.x = main.append("g")
            .attr(CSS_CLASS, CLASS[axis] + ' ' + CLASS[axisX])
            .attr("clip-path", $$[clipPathForXAxis])
            .attr(CSS_TRANSFORM, $$[translate].x)
            .style(CSS_VISIBILITY, config[__axis_x_show] ? 'visible' : 'hidden');
        $$.axes.x.append("text")
            .attr(CSS_CLASS, CLASS[axisXLabel])
            .attr(CSS_TRANSFORM, config[__axis_rotated] ? "rotate(-90)" : "")
            .style(CSS_TEXT_ANCHOR, generateCall($$[textAnchorForXAxisLabel], $$));

        $$.axes.y = main.append("g")
            .attr(CSS_CLASS, CLASS[axis] + ' ' + CLASS[axisY])
            .attr("clip-path", $$[clipPathForYAxis])
            .attr(CSS_TRANSFORM, $$[translate].y)
            .style(CSS_VISIBILITY, config[__axis_y_show] ? 'visible' : 'hidden');
        $$.axes.y.append("text")
            .attr(CSS_CLASS, CLASS[axisYLabel])
            .attr(CSS_TRANSFORM, config[__axis_rotated] ? "" : "rotate(-90)")
            .style(CSS_TEXT_ANCHOR, generateCall($$[textAnchorForYAxisLabel], $$));

        $$.axes.y2 = main.append("g")
            .attr(CSS_CLASS, CLASS[axis] + ' ' + CLASS[axisY2])
            // clip-path?
            .attr(CSS_TRANSFORM, $$[translate].y2)
            .style(CSS_VISIBILITY, config[__axis_y2_show] ? 'visible' : 'hidden');
        $$.axes.y2.append("text")
            .attr(CSS_CLASS, CLASS[axisY2Label])
            .attr(CSS_TRANSFORM, config[__axis_rotated] ? "" : "rotate(-90)")
            .style(CSS_TEXT_ANCHOR, generateCall($$[textAnchorForY2AxisLabel], $$));

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

        // Draw with targets
        if (binding) {
            $$[updateDimension]();
            $$[redraw]({
                withTransform: true,
                withUpdateXDomain: true,
                withUpdateOrgXDomain: true,
                withTransitionForAxis: false
            });
        }

        // 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]]);
            }), $$[getXAxisTickFormat](), $$[getYFormat]($$[hasArcType]($$.data.targets)), $$.color));
            $$.tooltip.style("top", config[__tooltip_init_position].top)
                .style("left", config[__tooltip_init_position].left)
                .style("display", "block");
        }

        // Bind resize event
        if (window.onresize == null) {
            window.onresize = $$[generateResize]();
        }
        if (window.onresize.add) {
            window.onresize.add(function () {
                config[__onresize].call($$);
            });
            window.onresize.add(function () {
                $$.api.flush();
            });
            window.onresize.add(function () {
                config[__onresized].call($$);
            });
        }

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


    var smoothLines = 'smoothLines';
    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)
                });
            });
        }
    };


    var updateSizes = 'updateSizes';
    c3_chart_internal_fn[updateSizes] = function () {
        var $$ = this, config = $$.config;
        var legendHeight = $$[getLegendHeight](), legendWidth = $$[getLegendWidth](),
            legendHeightForBottom = $$[isLegendRight] || $$[isLegendInset] ? 0 : legendHeight,
            hasArc = $$[hasArcType]($$.data.targets),
            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, context
        if (config[__axis_rotated]) {
            $$.margin = {
                top: $$[getHorizontalAxisHeight]('y2') + $$[getCurrentPaddingTop](),
                right: hasArc ? 0 : $$[getCurrentPaddingRight](),
                bottom: $$[getHorizontalAxisHeight]('y') + legendHeightForBottom + $$[getCurrentPaddingBottom](),
                left: subchartHeight + (hasArc ? 0 : $$[getCurrentPaddingLeft]())
            };
            $$.margin2 = {
                top: $$.margin.top,
                right: NaN,
                bottom: 20 + legendHeightForBottom,
                left: $$[rotated_padding_left]
            };
        } else {
            $$.margin = {
                top: 4 + $$[getCurrentPaddingTop](), // for top tick text
                right: hasArc ? 0 : $$[getCurrentPaddingRight](),
                bottom: xAxisHeight + subchartHeight + legendHeightForBottom + $$[getCurrentPaddingBottom](),
                left: hasArc ? 0 : $$[getCurrentPaddingLeft]()
            };
            $$.margin2 = {
                top: $$.currentHeight - subchartHeight - legendHeightForBottom,
                right: NaN,
                bottom: xAxisHeight + legendHeightForBottom,
                left: $$.margin.left
            };
        }
        // for legend
        var 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
        };

        $$.width = $$.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 (isFunction($$.updateRadius)) {
            $$[updateRadius]();
        }

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

    var updateTargets = 'updateTargets';
    c3_chart_internal_fn[updateTargets] = function (targets) {
        var mainLineEnter, mainLineUpdate, mainBarEnter, mainBarUpdate, mainTextUpdate, mainTextEnter;
        var $$ = this, config = $$.config, main = $$.main;

        /*-- Main --*/

        //-- Text --//
        mainTextUpdate = main.select('.' + CLASS[chartTexts]).selectAll('.' + CLASS[chartText])
            .data(targets)
            .attr(CSS_CLASS, generateCall($$[classChartText], $$));
        mainTextEnter = mainTextUpdate.enter().append('g')
            .attr(CSS_CLASS, generateCall($$[classChartText], $$))
            .style(CSS_OPACITY, 0)
            .style(CSS_POINTER_EVENTS, "none");
        mainTextEnter.append('g')
            .attr(CSS_CLASS, generateCall($$[classTexts], $$));

        //-- Bar --//
        mainBarUpdate = main.select('.' + CLASS[chartBars]).selectAll('.' + CLASS[chartBar])
            .data(targets)
            .attr(CSS_CLASS, generateCall($$[classChartBar], $$));
        mainBarEnter = mainBarUpdate.enter().append('g')
            .attr(CSS_CLASS, generateCall($$[classChartBar], $$))
            .style(CSS_OPACITY, 0)
            .style(CSS_POINTER_EVENTS, "none");
        // Bars for each data
        mainBarEnter.append('g')
            .attr(CSS_CLASS, generateCall($$[classBars], $$))
            .style("cursor", function (d) { return config[__data_selection_isselectable](d) ? "pointer" : null; });

        //-- Line --//
        mainLineUpdate = main.select('.' + CLASS[chartLines]).selectAll('.' + CLASS[chartLine])
            .data(targets)
            .attr(CSS_CLASS, generateCall($$[classChartLine], $$));
        mainLineEnter = mainLineUpdate.enter().append('g')
            .attr(CSS_CLASS, generateCall($$[classChartLine], $$))
            .style(CSS_OPACITY, 0)
            .style(CSS_POINTER_EVENTS, "none");
        // Lines for each data
        mainLineEnter.append('g')
            .attr(CSS_CLASS, generateCall($$[classLines], $$));
        // Areas
        mainLineEnter.append('g')
            .attr(CSS_CLASS, generateCall($$[classAreas], $$));
        // Circles for each data point on lines
        mainLineEnter.append('g')
            .attr(CSS_CLASS, function (d) { return $$[generateClass](CLASS[selectedCircles], d.id); });
        mainLineEnter.append('g')
            .attr(CSS_CLASS, generateCall($$[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();

        if (isFunction($$.updateTargetsForArc)) {
            $$[updateTargetsForArc](targets);
        }
        if (isFunction($$.updateTargetsForSubchart)) {
            $$[updateTargetsForSubchart](targets);
        }

        /*-- Show --*/

        // Fade-in each chart
        $$.svg.selectAll('.' + CLASS[target]).filter(function (d) { return $$[isTargetToShow](d.id); })
          .transition().duration(config[__transition_duration])
            .style(CSS_OPACITY, 1);
    };

    var redraw = 'redraw';
    c3_chart_internal_fn[redraw] = function (options, transitions) {
        var $$ = this, main = $$.main, d3 = $$.d3, config = $$.config;
        var xgrid, xgridAttr, xgridData, xgridLines, xgridLine, ygrid, ygridLines, ygridLine, flushXGrid;
        var mainLine, mainArea, mainCircle, mainBar, mainRegion, mainText, eventRect, eventRectUpdate;
        var areaIndices = $$[getShapeIndices]($$.isAreaType), barIndices = $$[getShapeIndices]($$.isBarType), lineIndices = $$[getShapeIndices]($$.isLineType), maxDataCountTarget, tickOffset;
        var rectX, rectW;
        var withY, withSubchart, withTransition, withTransitionForExit, withTransitionForAxis, withTransform, withUpdateXDomain, withUpdateOrgXDomain, withLegend;
        var hideAxis = $$[hasArcType]($$.data.targets);
        var drawArea, drawBar, drawLine, xForText, yForText;
        var duration, durationForExit, durationForAxis, waitForDraw;
        var targetsToShow = $$[filterTargetsToShow]($$.data.targets), tickValues, i, intervalForCulling;

        xgrid = xgridLines = mainCircle = mainText = d3.selectAll([]);

        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);
        withLegend = getOption(options, "withLegend", false);
        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 || $$[generateAxisTransitions](durationForAxis);

        // update legend and transform each g
        if (withLegend && config[__legend_show]) {
            $$[updateLegend]($$[mapToIds]($$.data.targets), options, transitions);
        }

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

        if (targetsToShow.length) {
            $$[updateXDomain](targetsToShow, withUpdateXDomain, withUpdateOrgXDomain);
            // update axis tick values according to options
            if (!config[__axis_x_tick_values] && (config[__axis_x_tick_fit] || config[__axis_x_tick_count])) {
                tickValues = $$[generateTickValues]($$[mapTargetsToUniqueXs](targetsToShow), config[__axis_x_tick_count]);
                $$.xAxis.tickValues(tickValues);
                $$.subXAxis.tickValues(tickValues);
            }
        } else {
            $$.xAxis.tickValues([]);
            $$.subXAxis.tickValues([]);
        }

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

        // axes
        $$.axes.x.style(CSS_OPACITY, hideAxis ? 0 : 1);
        $$.axes.y.style(CSS_OPACITY, hideAxis ? 0 : 1);
        $$.axes.y2.style(CSS_OPACITY, hideAxis ? 0 : 1);
        $$.axes.subx.style(CSS_OPACITY, hideAxis ? 0 : 1);
        transitions.axisX.call($$.xAxis);
        transitions.axisY.call($$.yAxis);
        transitions.axisY2.call($$.y2Axis);
        transitions.axisSubX.call($$.subXAxis);

        // Update axis label
        $$[updateAxisLabels](withTransition);

        // show/hide if manual culling needed
        if (withUpdateXDomain && 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');
            }
        }

        // rotate tick text if needed
        if (!config[__axis_rotated] && config[__axis_x_tick_rotate]) {
            $$[rotateTickText]($$.axes.x, transitions.axisX, config[__axis_x_tick_rotate]);
        }

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

        // Update sub domain
        $$.subY.domain($$.y.domain());
        $$.subY2.domain($$.y2.domain());

        // tooltip
        $$.tooltip.style("display", "none");

        // 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(CSS_OPACITY, targetsToShow.length ? 0 : 1);

        // grid
        main.select('line.' + CLASS[xgridFocus]).style(CSS_VISIBILITY, "hidden");
        if (config[__grid_x_show]) {
            xgridAttr = config[__axis_rotated] ? {
                'x1': 0,
                'x2': $$.width,
                'y1': function (d) { return $$[x](d) - tickOffset; },
                'y2': function (d) { return $$[x](d) - tickOffset; }
            } : {
                'x1': function (d) { return $$[x](d) + tickOffset; },
                'x2': function (d) { return $$[x](d) + tickOffset; },
                'y1': 0,
                'y2': $$.height
            };
            // this is used to flow
            flushXGrid = function (withoutUpdate) {
                xgridData = $$[generateGridData](config[__grid_x_type], $$.x);
                tickOffset = $$[isCategorized] ? $$.xAxis.tickOffset() : 0;
                xgrid = main.select('.' + CLASS[xgrids]).selectAll('.' + CLASS[xgrid])
                    .data(xgridData);
                xgrid.enter().append('line').attr(CSS_CLASS, CLASS[xgrid]);
                if (!withoutUpdate) {
                    xgrid.attr(xgridAttr)
                        .style(CSS_OPACITY, function () { return +d3.select(this).attr(config[__axis_rotated] ? 'y1' : 'x1') === (config[__axis_rotated] ? $$.height : 0) ? 0 : 1; });
                }
                xgrid.exit().remove();
            };
            flushXGrid();
        }
        xgridLines = main.select('.' + CLASS[xgridLines]).selectAll('.' + CLASS[xgridLine])
            .data(config[__grid_x_lines]);
        // enter
        xgridLine = xgridLines.enter().append('g')
            .attr(CSS_CLASS, function (d) { return CLASS[xgridLine] + (d.class ? ' ' + d.class : ''); });
        xgridLine.append('line')
            .style(CSS_OPACITY, 0);
        xgridLine.append('text')
            .attr(CSS_TEXT_ANCHOR, "end")
            .attr(CSS_TRANSFORM, config[__axis_rotated] ? "" : "rotate(-90)")
            .attr('dx', config[__axis_rotated] ? 0 : -$$.margin.top)
            .attr('dy', -5)
            .style(CSS_OPACITY, 0);
        // udpate
        // done in d3.transition() of the end of this function
        // exit
        xgridLines.exit().transition().duration(duration)
            .style(CSS_OPACITY, 0)
            .remove();
        // Y-Grid
        if (withY && config[__grid_y_show]) {
            ygrid = main.select('.' + CLASS[ygrids]).selectAll('.' + CLASS[ygrid])
                .data($$.y.ticks(config[__grid_y_ticks]));
            ygrid.enter().append('line')
                .attr(CSS_CLASS, CLASS[ygrid]);
            ygrid.attr("x1", config[__axis_rotated] ? $$.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');
        }
        if (withY) {
            ygridLines = main.select('.' + CLASS[ygridLines]).selectAll('.' + CLASS[ygridLine])
                .data(config[__grid_y_lines]);
            // enter
            ygridLine = ygridLines.enter().append('g')
                .attr(CSS_CLASS, function (d) { return CLASS[ygridLine] + (d.class ? ' ' + d.class : ''); });
            ygridLine.append('line')
                .style(CSS_OPACITY, 0);
            ygridLine.append('text')
                .attr(CSS_TEXT_ANCHOR, "end")
                .attr(CSS_TRANSFORM, config[__axis_rotated] ? "rotate(-90)" : "")
                .attr('dx', config[__axis_rotated] ? 0 : -$$.margin.top)
                .attr('dy', -5)
                .style(CSS_OPACITY, 0);
            // update
            var yv_ = generateCall($$[yv], $$);
            ygridLines.select('line')
              .transition().duration(duration)
                .attr("x1", config[__axis_rotated] ? yv_ : 0)
                .attr("x2", config[__axis_rotated] ? yv_ : $$.width)
                .attr("y1", config[__axis_rotated] ? 0 : yv_)
                .attr("y2", config[__axis_rotated] ? $$.height : yv_)
                .style(CSS_OPACITY, 1);
            ygridLines.select('text')
              .transition().duration(duration)
                .attr("x", config[__axis_rotated] ? 0 : $$.width)
                .attr("y", yv_)
                .text(function (d) { return d.text; })
                .style(CSS_OPACITY, 1);
            // exit
            ygridLines.exit().transition().duration(duration)
                .style(CSS_OPACITY, 0)
                .remove();
        }

        // rect for regions
        mainRegion = main.select('.' + CLASS[regions]).selectAll('.' + CLASS[region])
            .data(config[__regions]);
        mainRegion.enter().append('g')
            .attr(CSS_CLASS, generateCall($$[classRegion], $$))
          .append('rect')
            .style(CSS_FILL_OPACITY, 0);
        mainRegion.exit().transition().duration(duration)
            .style(CSS_OPACITY, 0)
            .remove();

        // bars
        mainBar = main.selectAll('.' + CLASS[bars]).selectAll('.' + CLASS[bar])
            .data(generateCall($$[barData], $$));
        mainBar.enter().append('path')
            .attr(CSS_CLASS, generateCall($$[classBar], $$))
            .style("stroke", function (d) { return $$[color](d.id); })
            .style("fill", function (d) { return $$[color](d.id); });
        mainBar
            .style(CSS_OPACITY, generateCall($$[initialOpacity], $$));
        mainBar.exit().transition().duration(durationForExit)
            .style(CSS_OPACITY, 0)
            .remove();

        // lines, areas and cricles
        mainLine = main.selectAll('.' + CLASS[lines]).selectAll('.' + CLASS[line])
            .data(generateCall($$[lineData], $$));
        mainLine.enter().append('path')
            .attr(CSS_CLASS, generateCall($$[classLine], $$))
            .style("stroke", $$.color);
        mainLine
            .style(CSS_OPACITY, generateCall($$[initialOpacity], $$))
            .attr(CSS_TRANSFORM, null);
        mainLine.exit().transition().duration(durationForExit)
            .style(CSS_OPACITY, 0)
            .remove();

        mainArea = main.selectAll('.' + CLASS[areas]).selectAll('.' + CLASS[area])
            .data(generateCall($$[lineData], $$));
        mainArea.enter().append('path')
            .attr(CSS_CLASS, generateCall($$[classArea], $$))
            .style("fill", $$.color)
            .style(CSS_OPACITY, function () { $$.orgAreaOpacity = +d3.select(this).style(CSS_OPACITY); return 0; });
        mainArea
            .style(CSS_OPACITY, $$.orgAreaOpacity);
        mainArea.exit().transition().duration(durationForExit)
            .style(CSS_OPACITY, 0)
            .remove();

        if (config[__point_show]) {
            mainCircle = main.selectAll('.' + CLASS[circles]).selectAll('.' + CLASS[circle])
                .data(generateCall($$[lineOrScatterData], $$));
            mainCircle.enter().append("circle")
                .attr(CSS_CLASS, generateCall($$[classCircle], $$))
                .attr("r", generateCall($$[pointR], $$))
                .style("fill", $$.color);
            mainCircle
                .style(CSS_OPACITY, generateCall($$[initialOpacity], $$));
            mainCircle.exit().remove();
        }

        if ($$[hasDataLabel]()) {
            mainText = main.selectAll('.' + CLASS[texts]).selectAll('.' + CLASS[text])
                .data(generateCall($$[barOrLineData], $$));
            mainText.enter().append('text')
                .attr(CSS_CLASS, generateCall($$[classText], $$))
                .attr(CSS_TEXT_ANCHOR, function (d) { return config[__axis_rotated] ? (d.value < 0 ? 'end' : 'start') : 'middle'; })
                .style("stroke", 'none')
                .style("fill", function (d) { return $$[color](d); })
                .style(CSS_FILL_OPACITY, 0);
            mainText
                .text(function (d) { return $$[formatByAxisId]($$[getAxisId](d.id))(d.value, d.id); });
            mainText.exit()
                .transition().duration(durationForExit)
                .style(CSS_FILL_OPACITY, 0)
                .remove();
        }

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

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

        // circles for select
        main.selectAll('.' + CLASS[selectedCircles])
            .filter(generateCall($$[isBarType], $$))
            .selectAll('circle')
            .remove();

        if (config[__interaction_enabled]) {
            // rect for mouseover
            eventRect = main.select('.' + CLASS[eventRects])
                .style('cursor', config[__zoom_enabled] ? config[__axis_rotated] ? 'ns-resize' : 'ew-resize' : null);
            if (notEmpty(config[__data_xs]) && !$$[isSingleX](config[__data_xs])) {

                if (!eventRect.classed(CLASS[eventRectsMultiple])) {
                    eventRect.classed(CLASS[eventRectsMultiple], true).classed(CLASS[eventRectsSingle], false)
                        .selectAll('.' + CLASS[eventRect]).remove();
                }

                eventRectUpdate = main.select('.' + CLASS[eventRects]).selectAll('.' + CLASS[eventRect])
                    .data([0]);
                // enter : only one rect will be added
                $$[generateEventRectsForMultipleXs](eventRectUpdate.enter());
                // update
                eventRectUpdate
                    .attr('x', 0)
                    .attr('y', 0)
                    .attr('width', $$.width)
                    .attr('height', $$.height);
                // exit : not needed because always only one rect exists
            } else {

                if (!eventRect.classed(CLASS[eventRectsSingle])) {
                    eventRect.classed(CLASS[eventRectsMultiple], false).classed(CLASS[eventRectsSingle], true)
                        .selectAll('.' + CLASS[eventRect]).remove();
                }

                if (($$[isCustomX]() || $$[isTimeSeries]) && !$$[isCategorized]) {
                    rectW = function (d) {
                        var prevX = $$[getPrevX](d.index), nextX = $$[getNextX](d.index), dx = $$.data.xs[d.id][d.index],
                            w = ($$[x](nextX ? nextX : dx) - $$[x](prevX ? prevX : dx)) / 2;
                        return w < 0 ? 0 : w;
                    };
                    rectX = function (d) {
                        var prevX = $$[getPrevX](d.index), dx = $$.data.xs[d.id][d.index];
                        return ($$[x](dx) + $$[x](prevX ? prevX : dx)) / 2;
                    };
                } else {
                    rectW = $$[getEventRectWidth]();
                    rectX = function (d) {
                        return $$[x](d.x) - (rectW / 2);
                    };
                }
                // Set data
                maxDataCountTarget = $$[getMaxDataCountTarget]($$.data.targets);
                main.select('.' + CLASS[eventRects])
                    .datum(maxDataCountTarget ? maxDataCountTarget.values : []);
                // Update rects
                eventRectUpdate = main.select('.' + CLASS[eventRects]).selectAll('.' + CLASS[eventRect])
                    .data(function (d) { return d; });
                // enter
                $$[generateEventRectsForSingleX](eventRectUpdate.enter());
                // update
                eventRectUpdate
                    .attr(CSS_CLASS, generateCall($$[classEvent], $$))
                    .attr("x", config[__axis_rotated] ? 0 : rectX)
                    .attr("y", config[__axis_rotated] ? rectX : 0)
                    .attr("width", config[__axis_rotated] ? $$.width : rectW)
                    .attr("height", config[__axis_rotated] ? rectW : $$.height);
                // exit
                eventRectUpdate.exit().remove();
            }
        }

        var xv_ = generateCall($$[xv], $$);

        // transition should be derived from one transition
        d3.transition().duration(duration).each(function () {
            var transitions = [],
                cx = generateCall($$.config[__axis_rotated] ? $$.circleY : $$.circleX, $$),
                cy = generateCall($$.config[__axis_rotated] ? $$.circleX : $$.circleY, $$);

            transitions.push(mainBar.transition()
                .attr('d', drawBar)
                .style("fill", $$.color)
                .style(CSS_OPACITY, 1));
            transitions.push(mainLine.transition()
                .attr("d", drawLine)
                .style("stroke", $$.color)
                .style(CSS_OPACITY, 1));
            transitions.push(mainArea.transition()
                .attr("d", drawArea)
                .style("fill", $$.color)
                .style(CSS_OPACITY, $$.orgAreaOpacity));
            transitions.push(mainCircle.transition()
                .style(CSS_OPACITY, generateCall($$[opacityForCircle], $$))
                .style("fill", $$.color)
                .attr("cx", cx)
                .attr("cy", cy));
            transitions.push(main.selectAll('.' + CLASS[selectedCircle]).transition()
                .attr("cx", cx)
                .attr("cy", cy));
            transitions.push(mainText.transition()
                .attr('x', xForText)
                .attr('y', yForText)
                .style("fill", $$.color)
                .style(CSS_FILL_OPACITY, options.flow ? 0 : generateCall($$[opacityForText], $$)));
            transitions.push(mainRegion.selectAll('rect').transition()
                .attr("x", $$.regionX)
                .attr("y", $$.regionY)
                .attr("width", $$.regionWidth)
                .attr("height", $$.regionHeight)
                .style(CSS_FILL_OPACITY, function (d) { return isValue(d.opacity) ? d.opacity : 0.1; }));
            transitions.push(xgridLines.select('line').transition()
                .attr("x1", config[__axis_rotated] ? 0 : xv_)
                .attr("x2", config[__axis_rotated] ? $$.width : xv_)
                .attr("y1", config[__axis_rotated] ? xv_ : $$.margin.top)
                .attr("y2", config[__axis_rotated] ? xv_ : $$.height)
                .style(CSS_OPACITY, 1));
            transitions.push(xgridLines.select('text').transition()
                .attr("x", config[__axis_rotated] ? $$.width : 0)
                .attr("y", xv_)
                .text(function (d) { return d.text; })
                .style(CSS_OPACITY, 1));
            // Wait for end of transitions if called from flow API
            if (options.flow) {
                waitForDraw = $$[generateWait]();
                transitions.forEach(function (t) {
                    waitForDraw.add(t);
                });
            }
        })
        .call(waitForDraw ? waitForDraw : function () {}, function () { // only for flow
            var translateX, scaleX = 1, transform,
                flowIndex = options.flow.index,
                flowLength = options.flow.length,
                flowStart = $$[getValueOnIndex]($$.data.targets[0].values, flowIndex),
                flowEnd = $$[getValueOnIndex]($$.data.targets[0].values, flowIndex + flowLength),
                orgDomain = $$.x.domain(), domain,
                durationForFlow = options.flow.duration || duration,
                done = options.flow.done || function () {},
                wait = $$[generateWait]();

            // 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](targetsToShow, true, true);
            // update elements related to x scale
            if (flushXGrid) { flushXGrid(true); }

            // generate transform to flow
            if (!options.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) - $$[x](flowEnd.x);
                    } else {
                        translateX = diffDomain(domain) / 2;
                    }
                }
            } else if (options.flow.orgDataCount === 1 || flowStart.x === flowEnd.x) {
                translateX = $$[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)';

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

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

                // draw again for removing flowed elements and reverting attr
                xgrid
                    .attr(CSS_TRANSFORM, null)
                    .attr(xgridAttr);
                xgridLines
                    .attr(CSS_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(CSS_TRANSFORM, null)
                    .attr("d", drawBar);
                mainLine
                    .attr(CSS_TRANSFORM, null)
                    .attr("d", drawLine);
                mainArea
                    .attr(CSS_TRANSFORM, null)
                    .attr("d", drawArea);
                mainCircle
                    .attr(CSS_TRANSFORM, null)
                    .attr("cx", config[__axis_rotated] ? $$.circleY : $$.circleX)
                    .attr("cy", config[__axis_rotated] ? $$.circleX : $$.circleY);
                mainText
                    .attr(CSS_TRANSFORM, null)
                    .attr('x', xForText)
                    .attr('y', yForText)
                    .style(CSS_FILL_OPACITY, generateCall($$[opacityForText], $$));
                mainRegion
                    .attr(CSS_TRANSFORM, null);
                mainRegion.select('rect').filter($$.isRegionOnX)
                    .attr("x", $$.regionX)
                    .attr("width", $$.regionWidth);
                eventRectUpdate
                    .attr("x", config[__axis_rotated] ? 0 : rectX)
                    .attr("y", config[__axis_rotated] ? rectX : 0)
                    .attr("width", config[__axis_rotated] ? $$.width : rectW)
                    .attr("height", config[__axis_rotated] ? rectW : $$.height);

                // callback for end of flow
                done();
            });
        });

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

        $$[updateZoom]();
    };

    var redrawForZoom = 'redrawForZoom';
    c3_chart_internal_fn[redrawForZoom] = function () {
        var $$ = this, d3 = $$.d3, config = $$.config, zoom = $$.zoom, x = $$.x, orgXDomain = $$.orgXDomain;
        if (!config[__zoom_enabled]) {
            return;
        }
        if ($$[filterTargetsToShow]($$.data.targets).length === 0) {
            return;
        }
        if (d3.event.sourceEvent.type === 'mousemove' && zoom.altDomain) {
            x.domain(zoom.altDomain);
            zoom.scale(x).updateScaleExtent();
            return;
        }
        if ($$[isCategorized] && x.orgDomain()[0] === orgXDomain[0]) {
            x.domain([orgXDomain[0] - 1e-10, x.orgDomain()[1]]);
        }
        $$[redraw]({
            withTransition: false,
            withY: false,
            withSubchart: false
        });
        if (d3.event.sourceEvent.type === 'mousemove') {
            $$[cancelClick] = true;
        }
        config[__zoom_onzoom].call(c3, x.orgDomain());
    };
    var updateAndRedraw = 'updateAndRedraw';
    c3_chart_internal_fn[updateAndRedraw] = function (options) {
        var $$ = this, config = $$.config, transitions;
        options = options || {};
        // same with redraw
        options.withTransition = getOption(options, "withTransition", true);
        options.withTransform = getOption(options, "withTransform", false);
        options.withLegend = getOption(options, "withLegend", false);
        // NOT same with redraw
        options.withUpdateXDomain = true;
        options.withUpdateOrgXDomain = true;
        options.withTransitionForExit = false;
        options.withTransitionForTransform = getOption(options, "withTransitionForTransform", options.withTransition);
        // MEMO: this needs to be called before updateLegend and it means this ALWAYS needs to be called)
        $$[updateSizes]();
        // MEMO: called in updateLegend in redraw if withLegend
        if (!(options.withLegend && config[__legend_show])) {
            transitions = $$[generateAxisTransitions](options.withTransitionForAxis ? config[__transition_duration] : 0);
            // Update scales
            $$[updateScales]();
            $$[updateSvgSize]();
            // Update g positions
            $$[transformAll](options.withTransitionForTransform, transitions);
        }
        // Draw with new sizes & scales
        $$[redraw](options, transitions);
    };

    var generateEventRectsForSingleX = 'generateEventRectsForSingleX';
    c3_chart_internal_fn[generateEventRectsForSingleX] = function (eventRectEnter) {
        var $$ = this, d3 = $$.d3, config = $$.config;
        eventRectEnter.append("rect")
            .attr(CSS_CLASS, generateCall($$[classEvent], $$))
            .style("cursor", config[__data_selection_enabled] && config[__data_selection_grouped] ? "pointer" : null)
            .on('mouseover', function (d) {
                var index = d.index, selectedData, newData;

                if ($$[dragging]) { return; } // do nothing if dragging
                if ($$[hasArcType]($$.data.targets)) { return; }

                selectedData = $$.data.targets.map(function (t) {
                    return $$[addName]($$[getValueOnIndex](t.values, index));
                });

                // Sort selectedData as names order
                newData = [];
                Object.keys(config[__data_names]).forEach(function (id) {
                    for (var j = 0; j < selectedData.length; j++) {
                        if (selectedData[j] && selectedData[j].id === id) {
                            newData.push(selectedData[j]);
                            selectedData.shift(j);
                            break;
                        }
                    }
                });
                selectedData = newData.concat(selectedData); // Add remained

                // Expand shapes for selection
                if (config[__point_focus_expand_enabled]) { $$[expandCircles](index); }
                $$[expandBars](index);

                // Call event handler
                $$.main.selectAll('.' + CLASS[shape] + '-' + index).each(
                    generateCall(config[__data_onmouseover], $$)
                );
            })
            .on('mouseout', function (d) {
                var index = d.index;
                if ($$[hasArcType]($$.data.targets)) { return; }
                $$[hideXGridFocus]();
                $$[hideTooltip]();
                // Undo expanded shapes
                $$[unexpandCircles](index);
                $$[unexpandBars]();
                // Call event handler
                $$.main.selectAll('.' + CLASS[shape] + '-' + index).each(
                    generateCall(config[__data_onmouseout], $$)
                );
            })
            .on('mousemove', function (d) {
                var selectedData, index = d.index,
                    eventRect = $$.svg.select('.' + CLASS[eventRect] + '-' + index);

                if ($$[dragging]) { return; } // do nothing when dragging
                if ($$[hasArcType]($$.data.targets)) { return; }

                // Show tooltip
                selectedData = $$[filterTargetsToShow]($$.data.targets).map(function (t) {
                    return $$[addName]($$[getValueOnIndex](t.values, index));
                });

                if (config[__tooltip_grouped]) {
                    $$[showTooltip](selectedData, d3.mouse(this));
                    $$[showXGridFocus](selectedData);
                }

                if (config[__tooltip_grouped] && (!config[__data_selection_enabled] || config[__data_selection_grouped])) {
                    return;
                }

                $$.main.selectAll('.' + CLASS[shape] + '-' + index)
                    .each(function () {
                        d3.select(this).classed(CLASS[EXPANDED], true);
                        if (config[__data_selection_enabled]) {
                            eventRect.style('cursor', config[__data_selection_grouped] ? 'pointer' : null);
                        }
                        if (!config[__tooltip_grouped]) {
                            $$[hideXGridFocus]();
                            $$[hideTooltip]();
                            if (!config[__data_selection_grouped]) {
                                $$[unexpandCircles](index);
                                $$[unexpandBars]();
                            }
                        }
                    })
                    .filter(function (d) {
                        if (this.nodeName === 'circle') {
                            return $$[isWithinCircle](this, $$[pointSelectR](d));
                        }
                        else if (this.nodeName === 'path') {
                            return $$[isWithinBar](this);
                        }
                    })
                    .each(function (d) {
                        if (config[__data_selection_enabled] && (config[__data_selection_grouped] || config[__data_selection_isselectable](d))) {
                            eventRect.style('cursor', 'pointer');
                        }
                        if (!config[__tooltip_grouped]) {
                            $$[showTooltip]([d], d3.mouse(this));
                            $$[showXGridFocus]([d]);
                            if (config[__point_focus_expand_enabled]) { $$[expandCircles](index, d.id); }
                            $$[expandBars](index, d.id);
                        }
                    });
            })
            .on('click', function (d) {
                var index = d.index;
                if ($$[hasArcType]($$.data.targets)) { return; }
                if ($$[cancelClick]) {
                    $$[cancelClick] = false;
                    return;
                }
                $$.main.selectAll('.' + CLASS[shape] + '-' + index).each(function (d) { $$[toggleShape](this, d, index); });
            })
            .call(
                d3.behavior.drag().origin(Object)
                    .on('drag', function () { $$[drag](d3.mouse(this)); })
                    .on('dragstart', function () { $$[dragstart](d3.mouse(this)); })
                    .on('dragend', function () { $$[dragend](); })
            )
            .on("dblclick.zoom", null);
    };

    var generateEventRectsForMultipleXs = 'generateEventRectsForMultipleXs';
    c3_chart_internal_fn[generateEventRectsForMultipleXs] = function (eventRectEnter) {
        var $$ = this, d3 = $$.d3, config = $$.config;
        eventRectEnter.append('rect')
            .attr('x', 0)
            .attr('y', 0)
            .attr('width', $$.width)
            .attr('height', $$.height)
            .attr(CSS_CLASS, CLASS[eventRect])
            .on('mouseout', function () {
                if ($$[hasArcType]($$.data.targets)) { return; }
                $$[hideXGridFocus]();
                $$[hideTooltip]();
                $$[unexpandCircles]();
            })
            .on('mousemove', function () {
                var targetsToShow = $$[filterTargetsToShow]($$.data.targets);
                var mouse, closest, sameXData, selectedData;

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

                mouse = d3.mouse(this);
                closest = $$[findClosestFromTargets](targetsToShow, mouse);

                if (! closest) { return; }

                if ($$[isScatterType](closest)) {
                    sameXData = [closest];
                } else {
                    sameXData = $$[filterSameX](targetsToShow, closest.x);
                }

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

                // expand points
                if (config[__point_focus_expand_enabled]) {
                    $$[unexpandCircles]();
                    $$[expandCircles](closest.index, closest.id);
                }

                // Show xgrid focus line
                $$[showXGridFocus](selectedData);

                // Show cursor as pointer if point is close to mouse position
                if ($$[dist](closest, mouse) < 100) {
                    $$.svg.select('.' + CLASS[eventRect]).style('cursor', 'pointer');
                    if (!$$[mouseover]) {
                        config[__data_onmouseover].call($$, closest);
                        $$[mouseover] = true;
                    }
                } else if ($$[mouseover]) {
                    $$.svg.select('.' + CLASS[eventRect]).style('cursor', null);
                    config[__data_onmouseout].call($$, closest);
                    $$[mouseover] = false;
                }
            })
            .on('click', function () {
                var targetsToShow = $$[filterTargetsToShow]($$.data.targets);
                var mouse, closest;

                if ($$[hasArcType](targetsToShow)) { return; }

                mouse = d3.mouse(this);
                closest = $$[findClosestFromTargets](targetsToShow, mouse);

                if (! closest) { return; }

                // select if selection enabled
                if ($$[dist](closest, mouse) < 100) {
                    $$.main.select('.' + CLASS[circles] + $$[getTargetSelectorSuffix](closest.id)).select('.' + CLASS[circle] + '-' + closest.index).each(function () {
                        $$[toggleShape](this, closest, closest.index);
                    });
                }
            })
            .call(
                d3.behavior.drag().origin(Object)
                    .on('drag', function () { $$[drag](d3.mouse(this)); })
                    .on('dragstart', function () { $$[dragstart](d3.mouse(this)); })
                    .on('dragend', function () { $$[dragend](); })
            )
            .on("dblclick.zoom", null);
    };








    var initialOpacity = 'initialOpacity';
    c3_chart_internal_fn[initialOpacity] = function (d) {
        return d.value !== null && this[withoutFadeIn][d.id] ? 1 : 0;
    };
    var opacityForCircle = 'opacityForCircle';
    c3_chart_internal_fn[opacityForCircle] = function (d) {
        var $$ = this;
        return isValue(d.value) ? $$[isScatterType](d) ? 0.5 : 1 : 0;
    };
    var opacityForText = 'opacityForText';
    c3_chart_internal_fn[opacityForText] = function () {
        return this[hasDataLabel]() ? 1 : 0;
    };
    var xx = 'xx';
    c3_chart_internal_fn[xx] = function (d) {
        return d ? this[x](d.x) : null;
    };
    var xv = 'xv';
    c3_chart_internal_fn[xv] = function (d) {
        var $$ = this;
        return Math.ceil($$[x]($$[isTimeSeries] ? $$[parseDate](d.value) : d.value));
    };
    var yv = 'yv';
    c3_chart_internal_fn[yv] = function (d) {
        var $$ = this,
            yScale = d.axis && d.axis === 'y2' ? $$.y2 : $$.y;
        return Math.ceil(yScale(d.value));
    };
    var subxx = 'subxx';
    c3_chart_internal_fn[subxx] = function (d) {
        return d ? this[subX](d.x) : null;
    };



    var transformMain = 'transformMain';
    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(CSS_TRANSFORM, $$[translate].main);
        xAxis.attr(CSS_TRANSFORM, $$[translate].x);
        yAxis.attr(CSS_TRANSFORM, $$[translate].y);
        y2Axis.attr(CSS_TRANSFORM, $$[translate].y2);
        $$.main.select('.' + CLASS[chartArcs]).attr(CSS_TRANSFORM, $$[translate].arc);
    };
    var transformLegend = 'transformLegend';
    c3_chart_internal_fn[transformLegend] = function (withTransition) {
        var $$ = this;
        (withTransition ? $$.legend.transition() : $$.legend).attr(CSS_TRANSFORM, $$[translate].legend);
    };
    var transformAll = 'transformAll';
    c3_chart_internal_fn[transformAll] = function (withTransition, transitions) {
        var $$ = this;
        $$[transformMain](withTransition, transitions);
        if (config[__subchart_show]) { $$[transformContext](withTransition, transitions); }
        $$[transformLegend](withTransition);
    };


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


    var updateDimension = 'updateDimension';
    c3_chart_internal_fn[updateDimension] = function () {
        var $$ = this;
        if ($$.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);
    };

    var observeInserted = 'observeInserted';
    c3_chart_internal_fn[observeInserted] = function (selection) {
        var $$ = this, observer = new MutationObserver(function (mutations) {
            mutations.forEach(function (mutation) {
                if (mutation.type === 'childList' && mutation.previousSibling) {
                    observer.disconnect();
                    // need to wait for completion of load because size calculation requires the actual sizes determined after that completion
                    var interval = window.setInterval(function () {
                        // parentNode will NOT be null when completed
                        if (selection.node().parentNode) {
                            window.clearInterval(interval);
                            $$[updateDimension]();
                            $$[redraw]({
                                withTransform: true,
                                withUpdateXDomain: true,
                                withUpdateOrgXDomain: true,
                                withTransition: false,
                                withTransitionForTransform: false,
                                withLegend: true
                            });
                            selection.transition().style(CSS_OPACITY, 1);
                        }
                    }, 10);
                }
            });
        });
        observer.observe(selection.node(), {attributes: true, childList: true, characterData: true});
    };


    var generateResize = 'generateResize';
    c3_chart_internal_fn[generateResize] = function () {
        var resizeFunctions = [];
        function callResizeFunctions() {
            resizeFunctions.forEach(function (f) {
                f();
            });
        }
        callResizeFunctions.add = function (f) {
            resizeFunctions.push(f);
        };
        return callResizeFunctions;
    };



    var getCurrentWidth = 'getCurrentWidth';
    c3_chart_internal_fn[getCurrentWidth] = function () {
        var $$ = this, config = $$.config;
        return config[__size_width] ? config[__size_width] : $$[getParentWidth]();
    };
    var getCurrentHeight = 'getCurrentHeight';
    c3_chart_internal_fn[getCurrentHeight] = function () {
        var $$ = this, config = $$.config,
            h = config[__size_height] ? config[__size_height] : $$[getParentHeight]();
        return h > 0 ? h : 320;
    };
    var getCurrentPaddingTop = 'getCurrentPaddingTop';
    c3_chart_internal_fn[getCurrentPaddingTop] = function () {
        var config = this.config;
        return isValue(config[__padding_top]) ? config[__padding_top] : 0;
    };
    var getCurrentPaddingBottom = 'getCurrentPaddingBottom';
    c3_chart_internal_fn[getCurrentPaddingBottom] = function () {
        var config = this.config;
        return isValue(config[__padding_bottom]) ? config[__padding_bottom] : 0;
    };
    var getCurrentPaddingLeft = 'getCurrentPaddingLeft';
    c3_chart_internal_fn[getCurrentPaddingLeft] = function () {
        var $$ = this, config = $$.config;
        if (isValue(config[__padding_left])) {
            return config[__padding_left];
        } else if (config[__axis_rotated]) {
            return !config[__axis_x_show] ? 1 : Math.max(ceil10($$[getAxisWidthByAxisId]('x')), 40);
        } else {
            return !config[__axis_y_show] || config[__axis_y_inner] ? 1 : ceil10($$[getAxisWidthByAxisId]('y'));
        }
    };
    var getCurrentPaddingRight = 'getCurrentPaddingRight';
    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 {
            return (!config[__axis_y2_show] || config[__axis_y2_inner] ? defaultPadding : ceil10($$[getAxisWidthByAxisId]('y2'))) + legendWidthOnRight;
        }
    };

    var getParentRectValue = 'getParentRectValue';
    c3_chart_internal_fn[getParentRectValue] = function (key) {
        var parent = this.selectChart.node(), v;
        while (parent && parent.tagName !== 'BODY') {
            v = parent.getBoundingClientRect()[key];
            if (v) {
                break;
            }
            parent = parent.parentNode;
        }
        return v;
    };
    var getParentWidth = 'getParentWidth';
    c3_chart_internal_fn[getParentWidth] = function () {
        return this[getParentRectValue]('width');
    };
    var getParentHeight = 'getParentHeight';
    c3_chart_internal_fn[getParentHeight] = function () {
        var h = this.selectChart.style('height');
        return h.indexOf('px') > 0 ? +h.replace('px', '') : 0;
    };


    var getSvgLeft = 'getSvgLeft';
    c3_chart_internal_fn[getSvgLeft] = function () {
        var $$ = this, config = $$.config,
            leftAxisClass = config[__axis_rotated] ? CLASS[axisX] : CLASS[axisY],
            leftAxis = $$.main.select('.' + leftAxisClass).node(),
            svgRect = leftAxis ? leftAxis.getBoundingClientRect() : {right: 0},
            chartRect = $$.selectChart.node().getBoundingClientRect(),
            hasArc = $$[hasArcType]($$.data.targets),
            svgLeft = svgRect.right - chartRect.left - (hasArc ? 0 : $$[getCurrentPaddingLeft]());
        return svgLeft > 0 ? svgLeft : 0;
    };


    var getAxisWidthByAxisId = 'getAxisWidthByAxisId';
    c3_chart_internal_fn[getAxisWidthByAxisId] = function (id) {
        var $$ = this, position = $$[getAxisLabelPositionById](id);
        return position.isInner ? 20 + $$[getMaxTickWidth](id) : 40 + $$[getMaxTickWidth](id);
    };
    var getHorizontalAxisHeight = 'getHorizontalAxisHeight';
    c3_chart_internal_fn[getHorizontalAxisHeight] = function (axisId) {
        var $$ = this, config = $$.config;
        if (axisId === 'x' && !config[__axis_x_show]) { return 0; }
        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 $$[rotated_padding_top]; }
        return ($$[getAxisLabelPositionById](axisId).isInner ? 30 : 40) + (axisId === 'y2' ? -10 : 0);
    };

    var getEventRectWidth = 'getEventRectWidth';
    c3_chart_internal_fn[getEventRectWidth] = function () {
        var $$ = this;
        var target = $$[getMaxDataCountTarget]($$.data.targets),
            firstData, lastData, base, maxDataCount, ratio, w;
        if (!target) {
            return 0;
        }
        firstData = target.values[0], lastData = target.values[target.values.length - 1];
        base = $$[x](lastData.x) - $$[x](firstData.x);
        if (base === 0) {
            return $$.config[__axis_rotated] ? $$.height : $$.width;
        }
        maxDataCount = $$[getMaxDataCount]();
        ratio = ($$[hasType]($$.data.targets, TYPE_BAR) ? (maxDataCount - ($$[isCategorized] ? 0.25 : 1)) / maxDataCount : 1);
        w = maxDataCount > 1 ? (base * ratio) / (maxDataCount - 1) : base;
        return w < 1 ? 1 : w;
    };


    /**
     *  c3.tooltip.js
     */
    var showTooltip = 'showTooltip';
    c3_chart_internal_fn[showTooltip] = function (selectedData, mouse) {
        var $$ = this, config = $$.config;
        var tWidth, tHeight, svgLeft, tooltipLeft, tooltipRight, tooltipTop, chartRight;
        var forArc = $$[hasArcType]($$.data.targets),
            dataToShow = selectedData.filter(function (d) { return d && isValue(d.value); });
        if (dataToShow.length === 0 || !config[__tooltip_show]) {
            return;
        }
        $$.tooltip.html(config[__tooltip_contents].call($$, selectedData, $$[getXAxisTickFormat](), $$[getYFormat](forArc), $$.color)).style("display", "block");

        // Get tooltip dimensions
        tWidth = $$.tooltip.property('offsetWidth');
        tHeight = $$.tooltip.property('offsetHeight');
        // Determin tooltip position
        if (forArc) {
            tooltipLeft = ($$.width / 2) + mouse[0];
            tooltipTop = ($$.height / 2) + mouse[1] + 20;
        } else {
            if (config[__axis_rotated]) {
                svgLeft = $$[getSvgLeft]();
                tooltipLeft = svgLeft + mouse[0] + 100;
                tooltipRight = tooltipLeft + tWidth;
                chartRight = $$[getCurrentWidth]() - $$[getCurrentPaddingRight]();
                tooltipTop = $$[x](dataToShow[0].x) + 20;
            } else {
                svgLeft = $$[getSvgLeft]();
                tooltipLeft = svgLeft + $$[getCurrentPaddingLeft]() + $$[x](dataToShow[0].x) + 20;
                tooltipRight = tooltipLeft + tWidth;
                chartRight = svgLeft + $$[getCurrentWidth]() - $$[getCurrentPaddingRight]();
                tooltipTop = mouse[1] + 15;
            }

            if (tooltipRight > chartRight) {
                tooltipLeft -= tooltipRight - chartRight;
            }
            if (tooltipTop + tHeight > $$[getCurrentHeight]()) {
                tooltipTop -= tHeight + 30;
            }
        }
        // Set tooltip
        $$.tooltip
            .style("top", tooltipTop + "px")
            .style("left", tooltipLeft + 'px');
    };
    var hideTooltip = 'hideTooltip';
    c3_chart_internal_fn[hideTooltip] = function () {
        this.tooltip.style("display", "none");
    };

    
    /**
     *  c3.grid.js
     */
    var showXGridFocus = 'showXGridFocus';
    c3_chart_internal_fn[showXGridFocus] = function (selectedData) {
        var $$ = this, dataToShow = selectedData.filter(function (d) { return d && isValue(d.value); });
        if (! config[__tooltip_show]) { return; }
        // Hide when scatter plot exists
        if ($$[hasType]($$.data.targets, TYPE_SCATTER) || $$[hasArcType]($$.data.targets)) { return; }
        var focusEl = $$.main.selectAll('line.' + CLASS[xgridFocus]);
        focusEl
            .style(CSS_VISIBILITY, "visible")
            .data([dataToShow[0]])
            .attr(config[__axis_rotated] ? 'y1' : 'x1', generateCall($$[xx], $$))
            .attr(config[__axis_rotated] ? 'y2' : 'x2', generateCall($$[xx], $$));
        $$[smoothLines](focusEl, 'grid');
    };
    var hideXGridFocus = 'hideXGridFocus';
    c3_chart_internal_fn[hideXGridFocus] = function () {
        this.main.select('line.' + CLASS[xgridFocus]).style(CSS_VISIBILITY, "hidden");
    };
    var updateXgridFocus = 'updateXgridFocus';
    c3_chart_internal_fn[updateXgridFocus] = function () {
        var $$ = 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);
    };
    var generateGridData = 'generateGridData';
    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 = $$[getXDomain]();
            firstYear = xDomain[0].getFullYear();
            lastYear = xDomain[1].getFullYear();
            for (i = firstYear; i <= lastYear; i++) {
                gridData.push(new Date(i + '-01-01 00:00:00'));
            }
        } else {
            gridData = scale.ticks(10);
            if (gridData.length > tickNum) { // use only int
                gridData = gridData.filter(function (d) { return ("" + d).indexOf('.') < 0; });
            }
        }
        return gridData;
    };
    var getGridFilterToRemove = 'getGridFilterToRemove';
    c3_chart_internal_fn[getGridFilterToRemove] = function (params) {
        return params ? function (line) {
            var found = false;
            [].concat(params).forEach(function (param) {
                if ((('value' in param && line.value === params.value) || (CSS_CLASS in param && line.class === params.class))) {
                    found = true;
                }
            });
            return found;
        } : function () { return true; };
    };
    var removeGridLines = 'removeGridLines';
    c3_chart_internal_fn[removeGridLines] = function (params, forX) {
        var $$ = this, config = $$.config,
            toRemove = $$[getGridFilterToRemove](params),
            toShow = function (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(CSS_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.legend.js
     */
    var updateLegendStep = 'updateLegendStep';
    c3_chart_internal_fn[updateLegendStep] = function (step) {
        this[legendStep] = step;
    };
    var updateLegendItemWidth = 'updateLegendItemWidth';
    c3_chart_internal_fn[updateLegendItemWidth] = function (w) {
        this[legendItemWidth] = w;
    };
    var updateLegendItemHeight = 'updateLegendItemHeight';
    c3_chart_internal_fn[updateLegendItemHeight] = function (h) {
        this[legendItemHeight] = h;
    };
    var getLegendWidth = 'getLegendWidth';
    c3_chart_internal_fn[getLegendWidth] = function () {
        var $$ = this;
        return $$.config[__legend_show] ? $$[isLegendRight] || $$[isLegendInset] ? $$[legendItemWidth] * ($$[legendStep] + 1) : $$.currentWidth : 0;
    };
    var getLegendHeight = 'getLegendHeight';
    c3_chart_internal_fn[getLegendHeight] = function () {
        var $$ = this, config = $$.config, h = 0;
        if (config[__legend_show]) {
            if ($$[isLegendRight]) {
                h = $$.currentHeight;
            } else if ($$[isLegendInset]) {
                h = config[__legend_inset_step] ? Math.max(20, $$[legendItemHeight]) * (config[__legend_inset_step] + 1) : $$.height;
            } else {
                h = Math.max(20, $$[legendItemHeight]) * ($$[legendStep] + 1);
            }
        }
        return h;
    };
    var opacityForLegend = 'opacityForLegend';
    c3_chart_internal_fn[opacityForLegend] = function (legendItem) {
        var $$ = this;
        return legendItem.classed(CLASS[legendItemHidden]) ? $$[legendOpacityForHidden] : 1;
    };
    var opacityForUnfocusedLegend = 'opacityForUnfocusedLegend';
    c3_chart_internal_fn[opacityForUnfocusedLegend] = function (legendItem) {
        var $$ = this;
        return legendItem.classed(CLASS[legendItemHidden]) ? $$[legendOpacityForHidden] : 0.3;
    };
    var toggleFocusLegend = 'toggleFocusLegend';
    c3_chart_internal_fn[toggleFocusLegend] = function (id, focus) {
        var $$ = this;
        $$.legend.selectAll('.' + CLASS[legendItem])
          .transition().duration(100)
            .style(CSS_OPACITY, function (_id) {
                var This = $$.d3.select(this);
                if (id && _id !== id) {
                    return focus ? $$[opacityForUnfocusedLegend](This) : $$[opacityForLegend](This);
                } else {
                    return focus ? $$[opacityForLegend](This) : $$[opacityForUnfocusedLegend](This);
                }
            });
    };
    var revertLegend = 'revertLegend';
    c3_chart_internal_fn[revertLegend] = function () {
        var $$ = this, d3 = $$.d3;
        $$.legend.selectAll('.' + CLASS[legendItem])
          .transition().duration(100)
            .style(CSS_OPACITY, function () { return $$[opacityForLegend](d3.select(this)); });
    };
    var showLegend = 'showLegend';
    c3_chart_internal_fn[showLegend] = function (targetIds) {
        var $$ = this, config = $$.config;
        if (!config[__legend_show]) {
            config[__legend_show] = true;
            $$.legend.style(CSS_VISIBILITY, 'visible');
        }
        $$[removeHiddenLegendIds](targetIds);
        $$.legend.selectAll($$[selectorLegends](targetIds))
            .style(CSS_VISIBILITY, 'visible')
          .transition()
            .style(CSS_OPACITY, function () { return $$[opacityForLegend]($$.d3.select(this)); });
    };
    var hideLegend = 'hideLegend';
    c3_chart_internal_fn[hideLegend] = function (targetIds) {
        var $$ = this, config = $$.config;
        if (config[__legend_show] && isEmpty(targetIds)) {
            config[__legend_show] = false;
            $$.legend.style(CSS_VISIBILITY, 'hidden');
        }
        $$[addHiddenLegendIds](targetIds);
        $$.legend.selectAll($$[selectorLegends](targetIds))
            .style(CSS_OPACITY, 0)
            .style(CSS_VISIBILITY, 'hidden');
    };
    var updateLegend = 'updateLegend';
    c3_chart_internal_fn[updateLegend] = function (targetIds, options, transitions) {
        var $$ = this, config = $$.config;
        var xForLegend, xForLegendText, xForLegendRect, yForLegend, yForLegendText, yForLegendRect;
        var paddingTop = 4, paddingRight = 36, maxWidth = 0, maxHeight = 0, posMin = 10;
        var l, totalLength = 0, offsets = {}, widths = {}, heights = {}, margins = [0], steps = {}, step = 0;
        var withTransition, withTransitionForTransform;
        var hasFocused = $$.legend.selectAll('.' + CLASS[legendItemFocused]).size();
        var texts, rects, tiles;

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

        function updatePositions(textElement, id, reset) {
            var box = $$[getTextRect](textElement.textContent, CLASS[legendItem]),
                itemWidth = Math.ceil((box.width + paddingRight) / 10) * 10,
                itemHeight = Math.ceil((box.height + paddingTop) / 10) * 10,
                itemLength = $$[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 ($$[isLegendRight]) {
            xForLegend = function (id) { return maxWidth * steps[id]; };
            yForLegend = function (id) { return margins[steps[id]] + offsets[id]; };
        } else if ($$[isLegendInset]) {
            xForLegend = function (id) { return maxWidth * steps[id] + 10; };
            yForLegend = function (id) { return margins[steps[id]] + offsets[id]; };
        } else {
            xForLegend = function (id) { return margins[steps[id]] + offsets[id]; };
            yForLegend = function (id) { return maxHeight * steps[id]; };
        }
        xForLegendText = function (id, i) { return xForLegend(id, i) + 14; };
        yForLegendText = function (id, i) { return yForLegend(id, i) + 9; };
        xForLegendRect = function (id, i) { return xForLegend(id, i) - 4; };
        yForLegendRect = function (id, i) { return yForLegend(id, i) - 7; };

        // Define g for legend area
        l = $$.legend.selectAll('.' + CLASS[legendItem])
            .data(targetIds)
          .enter().append('g')
            .attr(CSS_CLASS, function (id) { return $$[generateClass](CLASS[legendItem], id); })
            .style(CSS_VISIBILITY, function (id) { return $$[isLegendToShow](id) ? 'visible' : 'hidden'; })
            .style('cursor', 'pointer')
            .on('click', function (id) {
                isFunction(config[__legend_item_onclick]) ? config[__legend_item_onclick].call(c3, id) : $$.api.toggle(id);
            })
            .on('mouseover', function (id) {
                $$.d3.select(this).classed(CLASS[legendItemFocused], true);
                if (!$$[transiting]) {
                    $$.api.focus(id);
                }
                if (isFunction(config[__legend_item_onmouseover])) {
                    config[__legend_item_onmouseover].call($$, id);
                }
            })
            .on('mouseout', function (id) {
                $$.d3.select(this).classed(CLASS[legendItemFocused], false);
                if (!$$[transiting]) {
                    $$.api.revert();
                }
                if (isFunction(config[__legend_item_onmouseout])) {
                    config[__legend_item_onmouseout].call($$, id);
                }
            });
        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 === 0); })
            .style(CSS_POINTER_EVENTS, "none")
            .attr('x', $$[isLegendRight] || $$[isLegendInset] ? xForLegendText : -200)
            .attr('y', $$[isLegendRight] || $$[isLegendInset] ? -200 : yForLegendText);
        l.append('rect')
            .attr(CSS_CLASS, CLASS[legendItemEvent])
            .style(CSS_FILL_OPACITY, 0)
            .attr('x', $$[isLegendRight] || $$[isLegendInset] ? xForLegendRect : -200)
            .attr('y', $$[isLegendRight] || $$[isLegendInset] ? -200 : yForLegendRect);
        l.append('rect')
            .attr(CSS_CLASS, CLASS[legendItemTile])
            .style(CSS_POINTER_EVENTS, "none")
            .style('fill', $$.color)
            .attr('x', $$[isLegendRight] || $$[isLegendInset] ? xForLegendText : -200)
            .attr('y', $$[isLegendRight] || $$[isLegendInset] ? -200 : yForLegend)
            .attr('width', 10)
            .attr('height', 10);
        // Set background for inset legend
        if ($$[isLegendInset] && maxWidth !== 0) {
            $$.legend.insert('g', '.' + CLASS[legendItem])
                .attr(CSS_CLASS, CLASS[legendBackground])
              .append('rect')
                .attr('height', $$[getLegendHeight]() - 10)
                .attr('width', maxWidth * (step + 1) + 10);
        }

        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 === 0); });
        (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 = $$.legend.selectAll('rect.' + CLASS[legendItemTile])
            .data(targetIds);
        (withTransition ? tiles.transition() : tiles)
            .style('fill', $$.color)
            .attr('x', xForLegend)
            .attr('y', yForLegend);

        // toggle legend state
        $$.legend.selectAll('.' + CLASS[legendItem])
            .classed(CLASS[legendItemHidden], function (id) { return !$$[isTargetToShow](id); })
            .transition()
            .style(CSS_OPACITY, function (id) {
                var This = $$.d3.select(this);
                if ($$[isTargetToShow](id)) {
                    return !hasFocused || This.classed(CLASS[legendItemFocused]) ? $$[opacityForLegend](This) : $$[opacityForUnfocusedLegend](This);
                } else {
                    return $$[legendOpacityForHidden];
                }
            });

        // 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);
    };




    var getClipPath = 'getClipPath';
    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 + ")";
    };
    var getAxisClipX = 'getAxisClipX';
    c3_chart_internal_fn[getAxisClipX] = function (forHorizontal) {
        // axis line width + padding for left
        return forHorizontal ? -(1 + 30) : -(this.margin.left - 1);
    };
    var getAxisClipY = 'getAxisClipY';
    c3_chart_internal_fn[getAxisClipY] = function (forHorizontal) {
        return forHorizontal ? -20 : -4;
    };
    var getXAxisClipX = 'getXAxisClipX';
    c3_chart_internal_fn[getXAxisClipX] = function () {
        var $$ = this;
        return $$[getAxisClipX](!$$.config[__axis_rotated]);
    };
    var getXAxisClipY = 'getXAxisClipY';
    c3_chart_internal_fn[getXAxisClipY] = function () {
        var $$ = this;
        return $$[getAxisClipY](!$$.config[__axis_rotated]);
    };
    var getYAxisClipX = 'getYAxisClipX';
    c3_chart_internal_fn[getYAxisClipX] = function () {
        var $$ = this;
        return $$[getAxisClipX]($$.config[__axis_rotated]);
    };
    var getYAxisClipY = 'getYAxisClipY';
    c3_chart_internal_fn[getYAxisClipY] = function () {
        var $$ = this;
        return $$[getAxisClipY]($$.config[__axis_rotated]);
    };
    var getAxisClipWidth = 'getAxisClipWidth';
    c3_chart_internal_fn[getAxisClipWidth] = function (forHorizontal) {
        var $$ = this;
        // width + axis line width + padding for left/right
        return forHorizontal ? $$.width + 2 + 30 + 30 : $$.margin.left + 20;
    };
    var getAxisClipHeight = 'getAxisClipHeight';
    c3_chart_internal_fn[getAxisClipHeight] = function (forHorizontal) {
        var $$ = this, config = $$.config;
        return forHorizontal ? (config[__axis_x_height] ? config[__axis_x_height] : 0) + 80 : $$.height + 8;
    };
    var getXAxisClipWidth = 'getXAxisClipWidth';
    c3_chart_internal_fn[getXAxisClipWidth] = function () {
        var $$ = this;
        return $$[getAxisClipWidth](!$$.config[__axis_rotated]);
    };
    var getXAxisClipHeight = 'getXAxisClipHeight';
    c3_chart_internal_fn[getXAxisClipHeight] = function () {
        var $$ = this;
        return $$[getAxisClipHeight](!$$.config[__axis_rotated]);
    };
    var getYAxisClipWidth = 'getYAxisClipWidth';
    c3_chart_internal_fn[getYAxisClipWidth] = function () {
        var $$ = this;
        return $$[getAxisClipWidth]($$.config[__axis_rotated]);
    };
    var getYAxisClipHeight = 'getYAxisClipHeight';
    c3_chart_internal_fn[getYAxisClipHeight] = function () {
        var $$ = this;
        return $$[getAxisClipHeight]($$.config[__axis_rotated]);
    };


    /**
     *  $$.data.js
     */
    var isX = 'isX';
    c3_chart_internal_fn[isX] = function (key) {
        var $$ = this, config = $$.config;
        return (config[__data_x] && key === config[__data_x]) || (notEmpty(config[__data_xs]) && hasValue(config[__data_xs], key));
    };
    var isNotX = 'isNotX';
    c3_chart_internal_fn[isNotX] = function (key) {
        return !this[isX](key);
    };
    var getXKey = 'getXKey';
    c3_chart_internal_fn[getXKey] = function (id) {
        var $$ = this, config = $$.config;
        return config[__data_x] ? config[__data_x] : notEmpty(config[__data_xs]) ? config[__data_xs][id] : null;
    };
    var getXValuesOfXKey = 'getXValuesOfXKey';
    c3_chart_internal_fn[getXValuesOfXKey] = function (key, targets) {
        var $$ = this,
            xValues, ids = targets && notEmpty(targets) ? $$[mapToIds](targets) : [];
        ids.forEach(function (id) {
            if ($$[getXKey](id) === key) {
                xValues = $$.data.xs[id];
            }
        });
        return xValues;
    };
    var getXValue = 'getXValue';
    c3_chart_internal_fn[getXValue] = function (id, i) {
        var $$ = this;
        return id in $$.data.xs && $$.data.xs[id] && isValue($$.data.xs[id][i]) ? $$.data.xs[id][i] : i;
    };
    var getOtherTargetXs = 'getOtherTargetXs';
    c3_chart_internal_fn[getOtherTargetXs] = function () {
        var $$ = this,
            idsForX = Object.keys($$.data.xs);
        return idsForX.length ? $$.data.xs[idsForX[0]] : null;
    };
    var getOtherTargetX = 'getOtherTargetX';
    c3_chart_internal_fn[getOtherTargetX] = function (index) {
        var xs = this[getOtherTargetXs]();
        return xs && index < xs.length ? xs[index] : null;
    };
    var addXs = 'addXs';
    c3_chart_internal_fn[addXs] = function (xs) {
        var $$ = this;
        Object.keys(xs).forEach(function (id) {
            $$.config[__data_xs][id] = xs[id];
        });
    };
    var isSingleX = 'isSingleX';
    c3_chart_internal_fn[isSingleX] = function (xs) {
        return this.d3.set(Object.keys(xs).map(function (id) { return xs[id]; })).size() === 1;
    };
    var addName = 'addName';
    c3_chart_internal_fn[addName] = function (data) {
        var $$ = this, name;
        if (data) {
            name = $$.config[__data_names][data.id];
            data.name = name ? name : data.id;
        }
        return data;
    };
    var getValueOnIndex = 'getValueOnIndex';
    c3_chart_internal_fn[getValueOnIndex] = function (values, index) {
        var valueOnIndex = values.filter(function (v) { return v.index === index; });
        return valueOnIndex.length ? valueOnIndex[0] : null;
    };
    var updateTargetX = 'updateTargetX';
    c3_chart_internal_fn[updateTargetX] = function (targets, x) {
        var $$ = this;
        targets.forEach(function (t) {
            t.values.forEach(function (v, i) {
                v.x = $$[generateTargetX](x[i], t.id, i);
            });
            $$.data.xs[t.id] = x;
        });
    };
    var updateTargetXs = 'updateTargetXs';
    c3_chart_internal_fn[updateTargetXs] = function (targets, xs) {
        var $$ = this;
        targets.forEach(function (t) {
            if (xs[t.id]) {
                $$[updateTargetX]([t], xs[t.id]);
            }
        });
    };
    var generateTargetX = 'generateTargetX';
    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;
    };
    var convertUrlToData = 'convertUrlToData';
    c3_chart_internal_fn[convertUrlToData] = function (url, mimeType, keys, done) {
        var $$ = this, type = mimeType ? mimeType : 'csv';
        $$.d3.xhr(url, function (error, data) {
            var d;
            if (type === 'json') {
                d = $$[convertJsonToData](JSON.parse(data.response), keys);
            } else {
                d = $$[convertCsvToData](data.response);
            }
            done(d);
        });
    };
    var cloneTarget = 'cloneTarget';
    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};
            })
        };
    };
    var getPrevX = 'getPrevX';
    c3_chart_internal_fn[getPrevX] = function (i) {
        var $$ = this, value = $$[getValueOnIndex]($$.data.targets[0].values, i - 1);
        return value ? value.x : null;
    };
    var getNextX = 'getNextX';
    c3_chart_internal_fn[getNextX] = function (i) {
        var $$ = this, value = $$[getValueOnIndex]($$.data.targets[0].values, i + 1);
        return value ? value.x : null;
    };
    var getMaxDataCount = 'getMaxDataCount';
    c3_chart_internal_fn[getMaxDataCount] = function () {
        var $$ = this;
        return $$.d3.max($$.data.targets, function (t) { return t.values.length; });
    };
    var getMaxDataCountTarget = 'getMaxDataCountTarget';
    c3_chart_internal_fn[getMaxDataCountTarget] = function (targets) {
        var length = targets.length, max = 0, maxTarget;
        if (length > 1) {
            targets.forEach(function (t) {
                if (t.values.length > max) {
                    maxTarget = t;
                    max = t.values.length;
                }
            });
        } else {
            maxTarget = length ? targets[0] : null;
        }
        return maxTarget;
    };
    var getEdgeX = 'getEdgeX';
    c3_chart_internal_fn[getEdgeX] = function (targets) {
        var target = this[getMaxDataCountTarget](targets), firstData, lastData;
        if (!target) {
            return [0, 0];
        }
        firstData = target.values[0], lastData = target.values[target.values.length - 1];
        return [firstData.x, lastData.x];
    };
    var mapToIds = 'mapToIds';
    c3_chart_internal_fn[mapToIds] = function (targets) {
        return targets.map(function (d) { return d.id; });
    };
    var mapToTargetIds = 'mapToTargetIds';
    c3_chart_internal_fn[mapToTargetIds] = function (ids) {
        var $$ = this;
        return ids ? (isString(ids) ? [ids] : ids) : $$[mapToIds]($$.data.targets);
    };
    var hasTarget = 'hasTarget';
    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;
    };
    var isTargetToShow = 'isTargetToShow';
    c3_chart_internal_fn[isTargetToShow] = function (targetId) {
        return this[hiddenTargetIds].indexOf(targetId) < 0;
    };
    var isLegendToShow = 'isLegendToShow';
    c3_chart_internal_fn[isLegendToShow] = function (targetId) {
        return this[hiddenLegendIds].indexOf(targetId) < 0;
    };
    var filterTargetsToShow = 'filterTargetsToShow';
    c3_chart_internal_fn[filterTargetsToShow] = function (targets) {
        var $$ = this;
        return targets.filter(function (t) { return $$[isTargetToShow](t.id); });
    };
    var mapTargetsToUniqueXs = 'mapTargetsToUniqueXs';
    c3_chart_internal_fn[mapTargetsToUniqueXs] = function (targets) {
        var $$ = this;
        var xs = $$.d3.set($$.d3.merge(targets.map(function (t) { return t.values.map(function (v) { return v.x; }); }))).values();
        return $$[isTimeSeries] ? xs.map(function (x) { return new Date(x); }) : xs.map(function (x) { return +x; });
    };
    var addHiddenTargetIds = 'addHiddenTargetIds';
    c3_chart_internal_fn[addHiddenTargetIds] = function (targetIds) {
        this[hiddenTargetIds] = this[hiddenTargetIds].concat(targetIds);
    };
    var removeHiddenTargetIds = 'removeHiddenTargetIds';
    c3_chart_internal_fn[removeHiddenTargetIds] = function (targetIds) {
        this[hiddenTargetIds] = this[hiddenTargetIds].filter(function (id) { return targetIds.indexOf(id) < 0; });
    };
    var addHiddenLegendIds = 'addHiddenLegendIds';
    c3_chart_internal_fn[addHiddenLegendIds] = function (targetIds) {
        this[hiddenLegendIds] = this[hiddenLegendIds].concat(targetIds);
    };
    var removeHiddenLegendIds = 'removeHiddenLegendIds';
    c3_chart_internal_fn[removeHiddenLegendIds] = function (targetIds) {
        this[hiddenLegendIds] = this[hiddenLegendIds].filter(function (id) { return targetIds.indexOf(id) < 0; });
    };
    var getValuesAsIdKeyed = 'getValuesAsIdKeyed';
    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;
    };
    var checkValueInTargets = 'checkValueInTargets';
    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;
    };
    var hasNegativeValueInTargets = 'hasNegativeValueInTargets';
    c3_chart_internal_fn[hasNegativeValueInTargets] = function (targets) {
        return this[checkValueInTargets](targets, function (v) { return v < 0; });
    };
    var hasPositiveValueInTargets = 'hasPositiveValueInTargets';
    c3_chart_internal_fn[hasPositiveValueInTargets] = function (targets) {
        return this[checkValueInTargets](targets, function (v) { return v > 0; });
    };
    var isOrderDesc = 'isOrderDesc';
    c3_chart_internal_fn[isOrderDesc] = function () {
        var config = this.config;
        return config[__data_order] && config[__data_order].toLowerCase() === 'desc';
    };
    var isOrderAsc = 'isOrderAsc';
    c3_chart_internal_fn[isOrderAsc] = function () {
        var config = this.config;
        return config[__data_order] && config[__data_order].toLowerCase() === 'asc';
    };
    var orderTargets = 'orderTargets';
    c3_chart_internal_fn[orderTargets] = function (targets) {
        var $$ = this, config = $$.config, orderAsc = $$[isOrderAsc](), orderDesc = $$[isOrderDesc]();
        if (orderAsc || orderDesc) {
            targets.sort(function (t1, t2) {
                var reducer = function (p, c) { return p + Math.abs(c.value); };
                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])) {
            targets.sort(config[__data_order]);
        } // TODO: accept name array for order
        return targets;
    };
    var filterSameX = 'filterSameX';
    c3_chart_internal_fn[filterSameX] = function (targets, x) {
        return this.d3.merge(targets.map(function (t) { return t.values; })).filter(function (v) { return v.x - x === 0; });
    };
    var filterRemoveNull = 'filterRemoveNull';
    c3_chart_internal_fn[filterRemoveNull] = function (data) {
        return data.filter(function (d) { return isValue(d.value); });
    };
    var hasDataLabel = 'hasDataLabel';
    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;
    };
    var getDataLabelLength = 'getDataLabelLength';
    c3_chart_internal_fn[getDataLabelLength] = function (min, max, axisId, key) {
        var $$ = this,
            lengths = [0, 0], paddingCoef = 1.3;
        $$.selectChart.select('svg').selectAll('.dummy')
            .data([min, max])
          .enter().append('text')
            .text(function (d) { return $$[formatByAxisId](axisId)(d); })
            .each(function (d, i) {
                lengths[i] = this.getBoundingClientRect()[key] * paddingCoef;
            })
          .remove();
        return lengths;
    };
    var isNoneArc = 'isNoneArc';
    c3_chart_internal_fn[isNoneArc] = function (d) {
        return this[hasTarget](this.data.targets, d.id);
    };
    var isArc = 'isArc';
    c3_chart_internal_fn[isArc] = function (d) {
        return 'data' in d && this[hasTarget](this.data.targets, d.data.id);
    };


    /**
     *  c3.data.convert.js
     */
    var convertCsvToData = 'convertCsvToData';
    c3_chart_internal_fn[convertCsvToData] = function (csv) {
        var d3 = this.d3, rows = d3.csv.parseRows(csv), d;
        if (rows.length === 1) {
            d = [{}];
            rows[0].forEach(function (id) {
                d[0][id] = null;
            });
        } else {
            d = d3.csv.parse(csv);
        }
        return d;
    };
    var convertJsonToData = 'convertJsonToData';
    c3_chart_internal_fn[convertJsonToData] = function (json, keys) {
        var $$ = this,
            new_rows = [], targetKeys, data;
        if (keys) { // when keys specified, json would be an array that includes objects
            targetKeys = keys.value;
            if (keys.x) {
                targetKeys.push(keys.x);
                $$.config[__data_x] = keys.x;
            }
            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 = !isDefined(o[key]) ? null : o[key];
                    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;
    };
    var convertRowsToData = 'convertRowsToData';
    c3_chart_internal_fn[convertRowsToData] = function (rows) {
        var keys = rows[0], new_row = {}, new_rows = [], i, j;
        for (i = 1; i < rows.length; i++) {
            new_row = {};
            for (j = 0; j < rows[i].length; j++) {
                if (!isDefined(rows[i][j])) {
                    throw new Error("Source data is missing a component at (" + i + "," + j + ")!");
                }
                new_row[keys[j]] = rows[i][j];
            }
            new_rows.push(new_row);
        }
        return new_rows;
    };
    var convertColumnsToData = 'convertColumnsToData';
    c3_chart_internal_fn[convertColumnsToData] = function (columns) {
        var new_rows = [], i, j, key;
        for (i = 0; i < columns.length; i++) {
            key = columns[i][0];
            for (j = 1; j < columns[i].length; j++) {
                if (!isDefined(new_rows[j - 1])) {
                    new_rows[j - 1] = {};
                }
                if (!isDefined(columns[i][j])) {
                    throw new Error("Source data is missing a component at (" + i + "," + j + ")!");
                }
                new_rows[j - 1][key] = columns[i][j];
            }
        }
        return new_rows;
    };
    var convertDataToTargets = 'convertDataToTargets';
    c3_chart_internal_fn[convertDataToTargets] = function (data, appendXs) {
        var $$ = this, config = $$.config,
            ids = $$.d3.keys(data[0]).filter($$.isNotX, $$),
            xs = $$.d3.keys(data[0]).filter($$.isX, $$),
            targets;

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

        // finish targets
        targets.forEach(function (t) {
            var i;
            // sort values by its x
            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;
            });
        });

        // 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.data.load.js
     */
    var load = 'load';
    c3_chart_internal_fn[load] = function (targets, args) {
        var $$ = this;
        if (targets) {
            // filter loading targets if needed
            if (args.filter) {
                targets = targets.filter(args.filter);
            }
            // set type if args.types || args.type specified
            if (args.type || args.types) {
                targets.forEach(function (t) {
                    $$[setTargetType](t.id, args.types ? args.types[t.id] : args.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 (isFunction(args.done)) {
            args.done();
        }
    };
    var loadFromArgs = 'loadFromArgs';
    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.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);
        }
    };
    var unload = 'unload';
    c3_chart_internal_fn[unload] = function (targetIds, done) {
        var $$ = this;
        if (!isFunction(done)) {
            done = function () {};
        }
        // filter existing target
        targetIds = targetIds.filter(function (id) { return $$[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 $$[selectorTarget](id); }))
          .transition()
            .style(CSS_OPACITY, 0)
            .remove()
            .call($$.endall, done);
        targetIds.forEach(function (id) {
            // Reset fadein for future load
            $$[withoutFadeIn][id] = false;
            // Remove target's elements
            $$.legend.selectAll('.' + CLASS[legendItem] + $$[getTargetSelectorSuffix](id)).remove();
            // Remove target
            $$.data.targets = $$.data.targets.filter(function (t) {
                return t.id !== id;
            });
        });
    };


    /**
     *  c3.data.category.js
     */
    var categoryName = 'categoryName';
    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.shape.js
     */
    var getShapeIndices = 'getShapeIndices';
    c3_chart_internal_fn[getShapeIndices] = function (typeFilter) {
        var $$ = this, config = $$.config,
            indices = {}, i = 0, j, k;
        $$[filterTargetsToShow]($$.data.targets.filter(typeFilter, $$)).forEach(function (d) {
            for (j = 0; j < config[__data_groups].length; j++) {
                if (config[__data_groups][j].indexOf(d.id) < 0) { continue; }
                for (k = 0; k < config[__data_groups][j].length; k++) {
                    if (config[__data_groups][j][k] in indices) {
                        indices[d.id] = indices[config[__data_groups][j][k]];
                        break;
                    }
                }
            }
            if (!isDefined(indices[d.id])) { indices[d.id] = i++; }
        });
        indices.__max__ = i - 1;
        return indices;
    };
    var getShapeX = 'getShapeX';
    c3_chart_internal_fn[getShapeX] = function (offset, targetsNum, indices, isSub) {
        var $$ = 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;
        };
    };
    var getShapeY = 'getShapeY';
    c3_chart_internal_fn[getShapeY] = function (isSub) {
        var $$ = this;
        return function (d) {
            var scale = isSub ? $$[getSubYScale](d.id) : $$[getYScale](d.id);
            return scale(d.value);
        };
    };
    var getShapeOffset = 'getShapeOffset';
    c3_chart_internal_fn[getShapeOffset] = function (typeFilter, indices, isSub) {
        var $$ = 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) {
                if (t.id === d.id || indices[t.id] !== indices[d.id]) { return; }
                if (targetIds.indexOf(t.id) < targetIds.indexOf(d.id) && t.values[i].value * d.value >= 0) {
                    offset += scale(t.values[i].value) - y0;
                }
            });
            return offset;
        };
    };

    var getInterpolate = 'getInterpolate';
    c3_chart_internal_fn[getInterpolate] = function (d) {
        var $$ = this;
        return $$[isSplineType](d) ? "cardinal" : $$[isStepType](d) ? "step-after" : "linear";
    };


    var circleX = 'circleX';
    c3_chart_internal_fn[circleX] = function (d) {
        return d.x || d.x === 0 ? this[x](d.x) : null;
    };
    var circleY = 'circleY';
    c3_chart_internal_fn[circleY] = function (d, i) {
        var $$ = this,
            lineIndices = $$[getShapeIndices]($$.isLineType), getPoint = $$[generateGetLinePoint](lineIndices);
        return $$.config[__data_groups].length > 0 ? getPoint(d, i)[0][1] : $$[getYScale](d.id)(d.value);
    };
    var getCircles = 'getCircles';
    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 : ''));
    };
    var expandCircles = 'expandCircles';
    c3_chart_internal_fn[expandCircles] = function (i, id) {
        var $$ = this;
        $$[getCircles](i, id)
            .classed(CLASS[EXPANDED], true)
            .attr('r', generateCall($$[pointExpandedR], $$));
    };
    var unexpandCircles = 'unexpandCircles';
    c3_chart_internal_fn[unexpandCircles] = function (i) {
        var $$ = this;
        $$[getCircles](i)
            .filter(function () { return $$.d3.select(this).classed(CLASS[EXPANDED]); })
            .classed(CLASS[EXPANDED], false)
            .attr('r', generateCall($$[pointR], $$));
    };
    var pointR = 'pointR';
    c3_chart_internal_fn[pointR] = function (d) {
        var $$ = this, config = $$.config;
        return config[__point_show] && !$$[isStepType](d) ? (isFunction(config[__point_r]) ? config[__point_r](d) : config[__point_r]) : 0;
    };
    var pointExpandedR = 'pointExpandedR';
    c3_chart_internal_fn[pointExpandedR] = function (d) {
        var $$ = this, config = $$.config;
        return config[__point_focus_expand_enabled] ? (config[__point_focus_expand_r] ? config[__point_focus_expand_r] : $$[pointR](d) * 1.75) : $$[pointR](d);
    };
    var pointSelectR = 'pointSelectR';
    c3_chart_internal_fn[pointSelectR] = function (d) {
        var $$ = this, config = $$.config;
        return config[__point_select_r] ? config[__point_select_r] : $$[pointR](d) * 4;
    };



    var getBarW = 'getBarW';
    c3_chart_internal_fn[getBarW] = function (axis, barTargetsNum) {
        var $$ = this, config = $$.config,
            w = typeof config[__bar_width] === 'number' ? config[__bar_width] : barTargetsNum ? (axis.tickOffset() * 2 * config[__bar_width_ratio]) / barTargetsNum : 0;
        return config[__bar_width_max] && w > config[__bar_width_max] ? config[__bar_width_max] : w;
    };
    var getBars = 'getBars';
    c3_chart_internal_fn[getBars] = function (i) {
        var $$ = this;
        return $$.main.selectAll('.' + CLASS[bar] + (isValue(i) ? '-' + i : ''));
    };
    var expandBars = 'expandBars';
    c3_chart_internal_fn[expandBars] = function (i) {
        var $$ = this;
        $$[getBars](i).classed(CLASS[EXPANDED], true);
    };
    var unexpandBars = 'unexpandBars';
    c3_chart_internal_fn[unexpandBars] = function (i) {
        var $$ = this;
        $$[getBars](i).classed(CLASS[EXPANDED], false);
    };
    var generateDrawBar = 'generateDrawBar';
    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;
        };
    };
    var generateGetBarPoints = 'generateGetBarPoints';
    c3_chart_internal_fn[generateGetBarPoints] = function (barIndices, isSub) {
        var $$ = this,
            barTargetsNum = barIndices.__max__ + 1,
            barW = $$[getBarW]($$.xAxis, barTargetsNum),
            barX = $$[getShapeX](barW, barTargetsNum, barIndices, !!isSub),
            barY = $$[getShapeY](!!isSub),
            barOffset = $$[getShapeOffset]($$.isBarType, barIndices, !!isSub),
            yScale = isSub ? $$.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, offset],
                [posX, posY - (y0 - offset)],
                [posX + barW, posY - (y0 - offset)],
                [posX + barW, offset]
            ];
        };
    };

    var generateDrawArea = 'generateDrawArea';
    c3_chart_internal_fn[generateDrawArea] = function (areaIndices, isSub) {
        var $$ = this, config = $$.config, area = $$.d3.svg.area(),
            getPoint = $$[generateGetAreaPoint](areaIndices, isSub),
            yScaleGetter = isSub ? $$.getSubYScale : $$.getYScale,
            xValue = function (d) { return (isSub ? $$.subxx : $$.xx).call($$, d); },
            value0 = function (d, i) {
                return config[__data_groups].length > 0 ? getPoint(d, i)[0][1] : yScaleGetter.call($$, d.id)(0);
            },
            value1 = function (d, i) {
                return config[__data_groups].length > 0 ? getPoint(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(value0).y1(value1);

        return function (d) {
            var data = $$[filterRemoveNull](d.values), x0 = 0, y0 = 0, path;
            if ($$[isAreaType](d)) {
                path = area.interpolate($$[getInterpolate](d))(data);
            } else {
                if (data[0]) {
                    x0 = $$[x](data[0].x);
                    y0 = $$[getYScale](d.id)(data[0].value);
                }
                path = config[__axis_rotated] ? "M " + y0 + " " + x0 : "M " + x0 + " " + y0;
            }
            return path ? path : "M 0 0";
        };
    };

    var generateDrawLine = 'generateDrawLine';
    c3_chart_internal_fn[generateDrawLine] = function (lineIndices, isSub) {
        var $$ = this, config = $$.config,
            line = $$.d3.svg.line(),
            getPoint = $$[generateGetLinePoint](lineIndices, isSub),
            yScaleGetter = isSub ? $$.getSubYScale : $$.getYScale,
            xValue = function (d) { return (isSub ? $$.subxx : $$.xx).call($$, d); },
            yValue = function (d, i) {
                return config[__data_groups].length > 0 ? getPoint(d, i)[0][1] : yScaleGetter.call($$, d.id)(d.value);
            };

        line = config[__axis_rotated] ? line.x(yValue).y(xValue) : line.x(xValue).y(yValue);
        if (!config[__line_connect_null]) { line = line.defined(function (d) { return d.value != null; }); }
        return function (d) {
            var data = config[__line_connect_null] ? $$[filterRemoveNull](d.values) : d.values,
                x = isSub ? $$.x : $$.subX, y = yScaleGetter.call($$, d.id), x0 = 0, y0 = 0, path;
            if ($$[isLineType](d)) {
                if (config[__data_regions][d.id]) {
                    path = $$[lineWithRegions](data, x, y, config[__data_regions][d.id]);
                } else {
                    path = line.interpolate($$[getInterpolate](d))(data);
                }
            } else {
                if (data[0]) {
                    x0 = x(data[0].x);
                    y0 = y(data[0].value);
                }
                path = config[__axis_rotated] ? "M " + y0 + " " + x0 : "M " + x0 + " " + y0;
            }
            return path ? path : "M 0 0";
        };
    };

    var generateXYForText = 'generateXYForText';
    c3_chart_internal_fn[generateXYForText] = function (barIndices, forX) {
        var $$ = this,
            getPoints = $$[generateGetBarPoints](barIndices, false),
            getter = forX ? $$.getXForText : $$.getYForText;
        return function (d, i) {
            return getter(getPoints(d, i), d, this);
        };
    };
    var getXForText = 'getXForText';
    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 = points[0][0] + (points[2][0] - points[0][0]) / 2;
        }
        return xPos > $$.width ? $$.width - box.width : xPos;
    };
    var getYForText = 'getYForText';
    c3_chart_internal_fn[getYForText] = function (points, d, textElement) {
        var $$ = this,
            box = textElement.getBoundingClientRect(), yPos;
        if (config[__axis_rotated]) {
            yPos = (points[0][0] + points[2][0] + box.height * 0.6) / 2;
        } else {
            yPos = points[2][1] + (d.value < 0 ? box.height : $$[isBarType](d) ? -3 : -6);
        }
        return yPos < box.height ? box.height : yPos;
    };

    var generateGetAreaPoint = 'generateGetAreaPoint';
    c3_chart_internal_fn[generateGetAreaPoint] = 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)]
            ];
        };
    };

    var generateGetLinePoint = 'generateGetLinePoint';
    c3_chart_internal_fn[generateGetLinePoint] = 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)]
            ];
        };
    };


    var lineWithRegions = 'lineWithRegions';
    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,
            xValue, yValue,
            regions = [];

        // Check start/end of regions
        if (isDefined(_regions)) {
            for (i = 0; i < _regions.length; i++) {
                regions[i] = {};
                if (!isDefined(_regions[i].start)) {
                    regions[i].start = d[0].x;
                } else {
                    regions[i].start = $$[isTimeSeries] ? $$[parseDate](_regions[i].start) : _regions[i].start;
                }
                if (!isDefined(_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
        if ($$[isTimeSeries]) {
            sWithRegion = function (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));
                return "M" + x(xv0) + " " + y(yp(j)) + " " + x(xv1) + " " + y(yp(j + diff));
            };
        } else {
            sWithRegion = function (d0, d1, j, diff) {
                return "M" + x(xp(j), true) + " " + y(yp(j)) + " " + x(xp(j + diff), true) + " " + y(yp(j + diff));
            };
        }

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

            // Draw as normal
            if (!isDefined(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, d[i].x, $$[isTimeSeries]);
                yp = $$[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;
    };



    var isWithinCircle = 'isWithinCircle';
    c3_chart_internal_fn[isWithinCircle] = function (_this, _r) {
        var d3 = this.d3,
            mouse = d3.mouse(_this), d3_this = d3.select(_this),
            cx = d3_this.attr("cx") * 1, cy = d3_this.attr("cy") * 1;
        return Math.sqrt(Math.pow(cx - mouse[0], 2) + Math.pow(cy - mouse[1], 2)) < _r;
    };
    var isWithinBar = 'isWithinBar';
    c3_chart_internal_fn[isWithinBar] = function (_this) {
        var d3 = this.d3,
            mouse = d3.mouse(_this), box = _this.getBoundingClientRect(),
            seg0 = _this.pathSegList.getItem(0), seg1 = _this.pathSegList.getItem(1),
            x = seg0.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;
    };
    var isWithinRegions = 'isWithinRegions';
    c3_chart_internal_fn[isWithinRegions] = function (x, regions) {
        var i;
        for (i = 0; i < regions.length; i++) {
            if (regions[i].start < x && x <= regions[i].end) { return true; }
        }
        return false;
    };




    var findSameXOfValues = 'findSameXOfValues';
    c3_chart_internal_fn[findSameXOfValues] = function (values, index) {
        var i, targetX = values[index].x, sames = [];
        for (i = index - 1; i >= 0; i--) {
            if (targetX !== values[i].x) { break; }
            sames.push(values[i]);
        }
        for (i = index; i < values.length; i++) {
            if (targetX !== values[i].x) { break; }
            sames.push(values[i]);
        }
        return sames;
    };

    var findClosestOfValues = 'findClosestOfValues';
    c3_chart_internal_fn[findClosestOfValues] = function (values, pos, _min, _max) { // MEMO: values must be sorted by x
        var $$ = this,
            min = _min ? _min : 0,
            max = _max ? _max : values.length - 1,
            med = Math.floor((max - min) / 2) + min,
            value = values[med],
            diff = $$[x](value.x) - pos[$$.config[__axis_rotated] ? 1 : 0],
            candidates;

        // Update range for search
        diff > 0 ? max = med : min = med;

        // if candidates are two closest min and max, stop recursive call
        if ((max - min) === 1 || (min === 0 && max === 0)) {

            // Get candidates that has same min and max index
            candidates = [];
            if (values[min].x || values[min].x === 0) {
                candidates = candidates.concat($$[findSameXOfValues](values, min));
            }
            if (values[max].x || values[max].x === 0) {
                candidates = candidates.concat($$[findSameXOfValues](values, max));
            }

            // Determine the closest and return
            return $$[findClosest](candidates, pos);
        }

        return $$[findClosestOfValues](values, pos, min, max);
    };
    var findClosestFromTargets = 'findClosestFromTargets';
    c3_chart_internal_fn[findClosestFromTargets] = function (targets, pos) {
        var $$ = this, candidates;

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

        // decide closest point and return
        return $$[findClosest](candidates, pos);
    };
    var findClosest = 'findClosest';
    c3_chart_internal_fn[findClosest] = function (values, pos) {
        var $$ = this, minDist, closest;
        values.forEach(function (v) {
            var d = $$[dist](v, pos);
            if (d < minDist || ! minDist) {
                minDist = d;
                closest = v;
            }
        });
        return closest;
    };
    var dist = 'dist';
    c3_chart_internal_fn[dist] = function (data, pos) {
        var $$ = this, config = $$.config,
            yScale = $$[getAxisId](data.id) === 'y' ? $$.y : $$.y2,
            xIndex = config[__axis_rotated] ? 1 : 0,
            yIndex = config[__axis_rotated] ? 0 : 1;
        return Math.pow($$[x](data.x) - pos[xIndex], 2) + Math.pow(yScale(data.value) - pos[yIndex], 2);
    };


    var setTargetType = 'setTargetType';
    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;
        }
    };
    var hasType = 'hasType';
    c3_chart_internal_fn[hasType] = function (targets, type) {
        var $$ = this, config = $$.config, has = false;
        targets.forEach(function (t) {
            if (config[__data_types][t.id] === type) { has = true; }
            if (!(t.id in config[__data_types]) && type === 'line') { has = true; }
        });
        return has;
    };
    var hasArcType = 'hasArcType';
    c3_chart_internal_fn[hasArcType] = function (targets) {
        return this[hasType](targets, TYPE_PIE) || this[hasType](targets, TYPE_DONUT) || this[hasType](targets, TYPE_GAUGE);
    };

    var isLineType = 'isLineType';
    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;
    };
    var isStepType = 'isStepType';
    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;
    };
    var isSplineType = 'isSplineType';
    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;
    };
    var isAreaType = 'isAreaType';
    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;
    };
    var isBarType = 'isBarType';
    c3_chart_internal_fn[isBarType] = function (d) {
        var id = isString(d) ? d : d.id;
        return this.config[__data_types][id] === 'bar';
    };
    var isScatterType = 'isScatterType';
    c3_chart_internal_fn[isScatterType] = function (d) {
        var id = isString(d) ? d : d.id;
        return this.config[__data_types][id] === 'scatter';
    };
    var isPieType = 'isPieType';
    c3_chart_internal_fn[isPieType] = function (d) {
        var id = isString(d) ? d : d.id;
        return this.config[__data_types][id] === 'pie';
    };
    var isGaugeType = 'isGaugeType';
    c3_chart_internal_fn[isGaugeType] = function (d) {
        var id = isString(d) ? d : d.id;
        return this.config[__data_types][id] === 'gauge';
    };
    var isDonutType = 'isDonutType';
    c3_chart_internal_fn[isDonutType] = function (d) {
        var id = isString(d) ? d : d.id;
        return this.config[__data_types][id] === 'donut';
    };
    var isArcType = 'isArcType';
    c3_chart_internal_fn[isArcType] = function (d) {
        return this[isPieType](d) || this[isDonutType](d) || this[isGaugeType](d);
    };
    var lineData = 'lineData';
    c3_chart_internal_fn[lineData] = function (d) {
        return this[isLineType](d) ? [d] : [];
    };
    var arcData = 'arcData';
    c3_chart_internal_fn[arcData] = function (d) {
        return this[isArcType](d.data) ? [d] : [];
    };
    /* not used
     function scatterData(d) {
     return isScatterType(d) ? d.values : [];
     }
     */
    var barData = 'barData';
    c3_chart_internal_fn[barData] = function (d) {
        return this[isBarType](d) ? d.values : [];
    };
    var lineOrScatterData = 'lineOrScatterData';
    c3_chart_internal_fn[lineOrScatterData] = function (d) {
        return this[isLineType](d) || this[isScatterType](d) ? d.values : [];
    };
    var barOrLineData = 'barOrLineData';
    c3_chart_internal_fn[barOrLineData] = function (d) {
        return this[isBarType](d) || this[isLineType](d) ? d.values : [];
    };



    /**
     *  c3.date.js
     */
    var parseDate = 'parseDate';
    c3_chart_internal_fn[parseDate] = function (date) {
        var $$ = this, parsedDate;
        if (date instanceof Date) {
            parsedDate = date;
        } else if (typeof date === 'number') {
            parsedDate = new Date(date);
        } else {
            parsedDate = $$[dataTimeFormat](config[__data_x_format]).parse(date);
        }
        if (!parsedDate || isNaN(+parsedDate)) {
            window.console.error("Failed to parse x '" + date + "' to Date object");
        }
        return parsedDate;
    };


    /**
     *  c3.color.js
     */
    var generateColor = 'generateColor';
    c3_chart_internal_fn[generateColor] = function (colors, pattern, callback) {
        var ids = [];

        return function (d) {
            var id = d.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;
        };
    };
    var generateLevelColor = 'generateLevelColor';
    c3_chart_internal_fn[generateLevelColor] = function (colors, threshold) {
        var asValue = threshold.unit === 'value',
            values = threshold.values && threshold.values.length ? threshold.values : [],
            max = threshold.max || 100;
        return 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;
        };
    };


    /**
     *  c3.scale.js
     */
    var getScale = 'getScale';
    c3_chart_internal_fn[getScale] = function (min, max, forTimeseries) {
        return (forTimeseries ? this.d3.time.scale() : this.d3.scale.linear()).range([min, max]);
    };
    var getX = 'getX';
    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 (d, raw) {
                var v = _scale(d) + offset(d);
                return raw ? v : Math.ceil(v);
            };
        } else {
            scale = function (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 ($$[isCategorized]) {
            scale.domain = function (domain) {
                if (!arguments.length) {
                    domain = this.orgDomain();
                    return [domain[0], domain[1] + 1];
                }
                _scale.domain(domain);
                return scale;
            };
        }
        return scale;
    };
    var getY = 'getY';
    c3_chart_internal_fn[getY] = function (min, max, domain) {
        var scale = this[getScale](min, max);
        if (domain) { scale.domain(domain); }
        return scale;
    };
    var getYScale = 'getYScale';
    c3_chart_internal_fn[getYScale] = function (id) {
        return this[getAxisId](id) === 'y2' ? this.y2 : this.y;
    };
    var getSubYScale = 'getSubYScale';
    c3_chart_internal_fn[getSubYScale] = function (id) {
        return this[getAxisId](id) === 'y2' ? this.subY2 : this.subY;
    };
    var updateScales = 'updateScales', x = 'x', y = 'y', subX = 'subX';
    c3_chart_internal_fn[updateScales] = function () {
        var $$ = 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 ? undefined : $$.y.domain());
        $$.y2 = $$[getY]($$.yMin, $$.yMax, forInit ? undefined : $$.y2.domain());
        $$[subX] = $$[getX]($$.xMin, $$.xMax, $$.orgXDomain, function (d) { return d % 1 ? 0 : $$.subXAxis.tickOffset(); });
        $$.subY = $$[getY]($$.subYMin, $$.subYMax, forInit ? undefined : $$.subY.domain());
        $$.subY2 = $$[getY]($$.subYMin, $$.subYMax, forInit ? undefined : $$.subY2.domain());
        // update axes
        $$.xAxisTickFormat = $$[getXAxisTickFormat]();
        $$.xAxisTickValues = config[__axis_x_tick_values] ? config[__axis_x_tick_values] : (forInit ? undefined : $$.xAxis.tickValues());
        $$.xAxis = $$[getXAxis]($$.x, $$[xOrient], $$.xAxisTickFormat, $$.xAxisTickValues);
        $$.subXAxis = $$[getXAxis]($$.subX, $$[subXOrient], $$.xAxisTickFormat, $$.xAxisTickValues);
        $$.yAxis = $$[getYAxis]($$.y, $$[yOrient], config[__axis_y_tick_format], config[__axis_y_ticks]);
        $$.y2Axis = $$[getYAxis]($$.y2, $$[y2Orient], config[__axis_y2_tick_format], config[__axis_y2_ticks]);
        // Set initialized scales to brush and zoom
        if (!forInit) {
            if ($$.brush) { $$.brush.scale($$.subX); }
            if (config[__zoom_enabled]) { $$.zoom.scale($$.x); }
        }
        // update for arc
        if (isFunction($$.updateArc)) {
            $$[updateArc]();
        }
    };


    /**
     *  c3.domain.js
     */
    var getYDomainMin = 'getYDomainMin';
    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 = $$[hasNegativeValueInTargets](targets);
            for (j = 0; j < config[__data_groups].length; j++) {
                // Determine baseId
                idsInGroup = config[__data_groups][j].filter(function (id) { return ids.indexOf(id) >= 0; });
                if (idsInGroup.length === 0) { continue; }
                baseId = idsInGroup[0];
                // Consider negative values
                if (hasNegativeValue && ys[baseId]) {
                    ys[baseId].forEach(function (v, i) {
                        ys[baseId][i] = v < 0 ? v : 0;
                    });
                }
                // Compute min
                for (k = 1; k < idsInGroup.length; k++) {
                    id = idsInGroup[k];
                    if (! ys[id]) { continue; }
                    ys[id].forEach(function (v, i) {
                        if ($$[getAxisId](id) === $$[getAxisId](baseId) && ys[baseId] && !(hasNegativeValue && +v > 0)) {
                            ys[baseId][i] += +v;
                        }
                    });
                }
            }
        }
        return $$.d3.min(Object.keys(ys).map(function (key) { return $$.d3.min(ys[key]); }));
    };
    var getYDomainMax = 'getYDomainMax';
    c3_chart_internal_fn[getYDomainMax] = function (targets) {
        var $$ = 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 ($$[getAxisId](id) === $$[getAxisId](baseId) && ys[baseId] && !(hasPositiveValue && +v < 0)) {
                            ys[baseId][i] += +v;
                        }
                    });
                }
            }
        }
        return $$.d3.max(Object.keys(ys).map(function (key) { return $$.d3.max(ys[key]); }));
    };
    var getYDomain = 'getYDomain';
    c3_chart_internal_fn[getYDomain] = function (targets, axisId) {
        var $$ = this, config = $$.config,
            yTargets = targets.filter(function (d) { return $$[getAxisId](d.id) === axisId; }),
            yMin = axisId === 'y2' ? config[__axis_y2_min] : config[__axis_y_min],
            yMax = axisId === 'y2' ? config[__axis_y2_max] : config[__axis_y_max],
            yDomainMin = isValue(yMin) ? yMin : $$[getYDomainMin](yTargets),
            yDomainMax = isValue(yMax) ? yMax : $$[getYDomainMax](yTargets),
            domainLength, padding, padding_top, padding_bottom,
            center = axisId === 'y2' ? config[__axis_y2_center] : config[__axis_y_center],
            yDomainAbs, lengths, diff, ratio, isAllPositive, isAllNegative,
            isZeroBased = ($$[hasType](yTargets, TYPE_BAR) && config[__bar_zerobased]) || ($$[hasType](yTargets, TYPE_AREA) && config[__area_zerobased]),
            showHorizontalDataLabel = $$[hasDataLabel]() && config[__axis_rotated],
            showVerticalDataLabel = $$[hasDataLabel]() && !config[__axis_rotated];
        if (yTargets.length === 0) { // use current domain if target of axisId is none
            return axisId === 'y2' ? $$.y2.domain() : $$.y.domain();
        }
        if (yDomainMin === yDomainMax) {
            yDomainMin < 0 ? yDomainMax = 0 : yDomainMin = 0;
        }
        isAllPositive = yDomainMin >= 0 && yDomainMax >= 0;
        isAllNegative = yDomainMin <= 0 && yDomainMax <= 0;

        // 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 (center) {
            yDomainAbs = Math.max(Math.abs(yDomainMin), Math.abs(yDomainMax));
            yDomainMax = yDomainAbs - center;
            yDomainMin = center - yDomainAbs;
        }
        // add padding for data label
        if (showHorizontalDataLabel) {
            lengths = $$[getDataLabelLength](yDomainMin, yDomainMax, axisId, 'width');
            diff = diffDomain($$.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 = $$[getDataLabelLength](yDomainMin, yDomainMax, axisId, 'height');
            padding_top += lengths[1];
            padding_bottom += lengths[0];
        }
        if (axisId === 'y' && config[__axis_y_padding]) {
            padding_top = $$[getAxisPadding](config[__axis_y_padding], 'top', padding, domainLength);
            padding_bottom = $$[getAxisPadding](config[__axis_y_padding], 'bottom', padding, domainLength);
        }
        if (axisId === 'y2' && config[__axis_y2_padding]) {
            padding_top = $$[getAxisPadding](config[__axis_y2_padding], 'top', padding, domainLength);
            padding_bottom = $$[getAxisPadding](config[__axis_y2_padding], 'bottom', padding, domainLength);
        }
        // Bar/Area chart should be 0-based if all positive|negative
        if (isZeroBased) {
            if (isAllPositive) { padding_bottom = yDomainMin; }
            if (isAllNegative) { padding_top = -yDomainMax; }
        }
        return [yDomainMin - padding_bottom, yDomainMax + padding_top];
    };
    var getXDomainMin = 'getXDomainMin';
    c3_chart_internal_fn[getXDomainMin] = function (targets) {
        var $$ = this, config = $$.config;
        return config[__axis_x_min] ?
            ($$[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; }); });
    };
    var getXDomainMax = 'getXDomainMax';
    c3_chart_internal_fn[getXDomainMax] = function (targets) {
        var $$ = this, config = $$.config;
        return config[__axis_x_max] ?
            ($$[isTimeSeries] ? this[parseDate](config[__axis_x_max]) : config[__axis_x_max]) :
            $$.d3.max(targets, function (t) { return $$.d3.max(t.values, function (v) { return v.x; }); });
    };
    var getXDomainPadding = 'getXDomainPadding';
    c3_chart_internal_fn[getXDomainPadding] = function (targets) {
        var $$ = this, config = $$.config,
            edgeX = this[getEdgeX](targets), diff = edgeX[1] - edgeX[0],
            maxDataCount, padding, paddingLeft, paddingRight;
        if ($$[isCategorized]) {
            padding = 0;
        } else if ($$[hasType](targets, TYPE_BAR)) {
            maxDataCount = $$[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};
    };
    var getXDomain = 'getXDomain';
    c3_chart_internal_fn[getXDomain] = function (targets) {
        var $$ = this,
            xDomain = [$$[getXDomainMin](targets), $$[getXDomainMax](targets)],
            firstX = xDomain[0], lastX = xDomain[1],
            padding = $$[getXDomainPadding](targets),
            min = 0, max = 0;
        // show center of x domain if min and max are the same
        if ((firstX - lastX) === 0 && !$$[isCategorized]) {
            firstX = $$[isTimeSeries] ? new Date(firstX.getTime() * 0.5) : -0.5;
            lastX = $$[isTimeSeries] ? new Date(lastX.getTime() * 1.5) : 0.5;
        }
        if (firstX || firstX === 0) {
            min = $$[isTimeSeries] ? new Date(firstX.getTime() - padding.left) : firstX - padding.left;
        }
        if (lastX || lastX === 0) {
            max = $$[isTimeSeries] ? new Date(lastX.getTime() + padding.right) : lastX + padding.right;
        }
        return [min, max];
    };
    var updateXDomain = 'updateXDomain';
    c3_chart_internal_fn[updateXDomain] = function (targets, withUpdateXDomain, withUpdateOrgXDomain, domain) {
        var $$ = this, config = $$.config;
        if (withUpdateOrgXDomain) {
            $$.x.domain(domain ? domain : $$.d3.extent($$[getXDomain](targets)));
            $$.orgXDomain = $$.x.domain();
            if (config[__zoom_enabled]) { $$.zoom.scale($$.x).updateScaleExtent(); }
            $$.subX.domain($$.x.domain());
            if ($$.brush) { $$.brush.scale($$.subX); }
        }
        if (withUpdateXDomain) {
            $$.x.domain(domain ? domain : (!$$.brush || $$.brush.empty()) ? $$.orgXDomain : $$.brush.extent());
            if (config[__zoom_enabled]) { $$.zoom.scale($$.x).updateScaleExtent(); }
        }
        return $$.x.domain();
    };




    var getXAxis = 'getXAxis';
    c3_chart_internal_fn[getXAxis] = function (scale, orient, tickFormat, tickValues) {
        var $$ = this, config = $$.config,
            axis = c3_axis($$.d3, $$[isCategorized]).scale(scale).orient(orient);

        // Set tick
        axis.tickFormat(tickFormat).tickValues(tickValues);
        if ($$[isCategorized]) {
            axis.tickCentered(config[__axis_x_tick_centered]);
            if (isEmpty(config[__axis_x_tick_culling])) {
                config[__axis_x_tick_culling] = false;
            }
        } else {
            // TODO: move this to c3_axis
            axis.tickOffset = function () {
                var edgeX = $$[getEdgeX]($$.data.targets), diff = $$[x](edgeX[1]) - $$[x](edgeX[0]),
                    base = diff ? diff : (config[__axis_rotated] ? $$.height : $$.width);
                return (base / $$[getMaxDataCount]()) / 2;
            };
        }

        return axis;
    };
    var getYAxis = 'getYAxis';
    c3_chart_internal_fn[getYAxis] = function (scale, orient, tickFormat, ticks) {
        return c3_axis(this.d3).scale(scale).orient(orient).tickFormat(tickFormat).ticks(ticks);
    };
    var getAxisId = 'getAxisId';
    c3_chart_internal_fn[getAxisId] = function (id) {
        var config = this.config;
        return id in config[__data_axes] ? config[__data_axes][id] : 'y';
    };
    var getXAxisTickFormat = 'getXAxisTickFormat';
    c3_chart_internal_fn[getXAxisTickFormat] = function () {
        var $$ = this, config = $$.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 ($$[isTimeSeries]) {
                format = function (date) {
                    return date ? $$[axisTimeFormat](config[__axis_x_tick_format])(date) : "";
                };
            }
        }
        return function (v) { return format.call($$, v); };
    };
    var getAxisLabelOptionByAxisId = 'getAxisLabelOptionByAxisId';
    c3_chart_internal_fn[getAxisLabelOptionByAxisId] = function (axisId) {
        var $$ = this, config = $$.config, option;
        if (axisId === 'y') {
            option = config[__axis_y_label];
        } else if (axisId === 'y2') {
            option = config[__axis_y2_label];
        } else if (axisId === 'x') {
            option = config[__axis_x_label];
        }
        return option;
    };
    var getAxisLabelText = 'getAxisLabelText';
    c3_chart_internal_fn[getAxisLabelText] = function (axisId) {
        var option = this[getAxisLabelOptionByAxisId](axisId);
        return isString(option) ? option : option ? option.text : null;
    };
    var setAxisLabelText = 'setAxisLabelText';
    c3_chart_internal_fn[setAxisLabelText] = function (axisId, text) {
        var $$ = this, config = $$.config,
            option = $$[getAxisLabelOptionByAxisId](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;
        }
    };
    var getAxisLabelPosition = 'getAxisLabelPosition';
    c3_chart_internal_fn[getAxisLabelPosition] = function (axisId, defaultPosition) {
        var option = this[getAxisLabelOptionByAxisId](axisId),
            position = (option && 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
        };
    };
    var getXAxisLabelPosition = 'getXAxisLabelPosition';
    c3_chart_internal_fn[getXAxisLabelPosition] = function () {
        return this[getAxisLabelPosition]('x', this.config[__axis_rotated] ? 'inner-top' : 'inner-right');
    };
    var getYAxisLabelPosition = 'getYAxisLabelPosition';
    c3_chart_internal_fn[getYAxisLabelPosition] = function () {
        return this[getAxisLabelPosition]('y', this.config[__axis_rotated] ? 'inner-right' : 'inner-top');
    };
    var getY2AxisLabelPosition = 'getY2AxisLabelPosition';
    c3_chart_internal_fn[getY2AxisLabelPosition] = function () {
        return this[getAxisLabelPosition]('y2', this.config[__axis_rotated] ? 'inner-right' : 'inner-top');
    };
    var getAxisLabelPositionById = 'getAxisLabelPositionById';
    c3_chart_internal_fn[getAxisLabelPositionById] = function (id) {
        return id === 'y2' ? this[getY2AxisLabelPosition]() : id === 'y' ? this[getYAxisLabelPosition]() : this[getXAxisLabelPosition]();
    };
    var textForXAxisLabel = 'textForXAxisLabel';
    c3_chart_internal_fn[textForXAxisLabel] = function () {
        return this[getAxisLabelText]('x');
    };
    var textForYAxisLabel = 'textForYAxisLabel';
    c3_chart_internal_fn[textForYAxisLabel] = function () {
        return this[getAxisLabelText]('y');
    };
    var textForY2AxisLabel = 'textForY2AxisLabel';
    c3_chart_internal_fn[textForY2AxisLabel] = function () {
        return this[getAxisLabelText]('y2');
    };
    var xForAxisLabel = 'xForAxisLabel';
    c3_chart_internal_fn[xForAxisLabel] = function (forHorizontal, position) {
        var $$ = this;
        if (forHorizontal) {
            return position.isLeft ? 0 : position.isCenter ? $$.width / 2 : $$.width;
        } else {
            return position.isBottom ? -$$.height : position.isMiddle ? -$$.height / 2 : 0;
        }
    };
    var dxForAxisLabel = 'dxForAxisLabel';
    c3_chart_internal_fn[dxForAxisLabel] = function (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";
        }
    };
    var textAnchorForAxisLabel = 'textAnchorForAxisLabel';
    c3_chart_internal_fn[textAnchorForAxisLabel] = function (forHorizontal, position) {
        if (forHorizontal) {
            return position.isLeft ? 'start' : position.isCenter ? 'middle' : 'end';
        } else {
            return position.isBottom ? 'start' : position.isMiddle ? 'middle' : 'end';
        }
    };
    var xForXAxisLabel = 'xForXAxisLabel';
    c3_chart_internal_fn[xForXAxisLabel] = function () {
        return this[xForAxisLabel](!this.config[__axis_rotated], this[getXAxisLabelPosition]());
    };
    var xForYAxisLabel = 'xForYAxisLabel';
    c3_chart_internal_fn[xForYAxisLabel] = function () {
        return this[xForAxisLabel](this.config[__axis_rotated], this[getYAxisLabelPosition]());
    };
    var xForY2AxisLabel = 'xForY2AxisLabel';
    c3_chart_internal_fn[xForY2AxisLabel] = function () {
        return this[xForAxisLabel](this.config[__axis_rotated], this[getY2AxisLabelPosition]());
    };
    var dxForXAxisLabel = 'dxForXAxisLabel';
    c3_chart_internal_fn[dxForXAxisLabel] = function () {
        return this[dxForAxisLabel](!this.config[__axis_rotated], this[getXAxisLabelPosition]());
    };
    var dxForYAxisLabel = 'dxForYAxisLabel';
    c3_chart_internal_fn[dxForYAxisLabel] = function () {
        return this[dxForAxisLabel](this.config[__axis_rotated], this[getYAxisLabelPosition]());
    };
    var dxForY2AxisLabel = 'dxForY2AxisLabel';
    c3_chart_internal_fn[dxForY2AxisLabel] = function () {
        return this[dxForAxisLabel](this.config[__axis_rotated], this[getY2AxisLabelPosition]());
    };
    var dyForXAxisLabel = 'dyForXAxisLabel';
    c3_chart_internal_fn[dyForXAxisLabel] = function () {
        var $$ = this, config = $$.config,
            position = $$[getXAxisLabelPosition]();
        if (config[__axis_rotated]) {
            return position.isInner ? "1.2em" : -25 - $$[getMaxTickWidth]('x');
        } else {
            return position.isInner ? "-0.5em" : config[__axis_x_height] ? config[__axis_x_height] - 10 : "3em";
        }
    };
    var dyForYAxisLabel = 'dyForYAxisLabel';
    c3_chart_internal_fn[dyForYAxisLabel] = function () {
        var $$ = this,
            position = $$[getYAxisLabelPosition]();
        if ($$.config[__axis_rotated]) {
            return position.isInner ? "-0.5em" : "3em";
        } else {
            return position.isInner ? "1.2em" : -20 - $$[getMaxTickWidth]('y');
        }
    };
    var dyForY2AxisLabel = 'dyForY2AxisLabel';
    c3_chart_internal_fn[dyForY2AxisLabel] = function () {
        var $$ = this,
            position = $$[getY2AxisLabelPosition]();
        if ($$.config[__axis_rotated]) {
            return position.isInner ? "1.2em" : "-2.2em";
        } else {
            return position.isInner ? "-0.5em" : 30 + this[getMaxTickWidth]('y2');
        }
    };
    var textAnchorForXAxisLabel = 'textAnchorForXAxisLabel';
    c3_chart_internal_fn[textAnchorForXAxisLabel] = function () {
        var $$ = this;
        return $$[textAnchorForAxisLabel](!$$.config[__axis_rotated], $$[getXAxisLabelPosition]());
    };
    var textAnchorForYAxisLabel = 'textAnchorForYAxisLabel';
    c3_chart_internal_fn[textAnchorForYAxisLabel] = function () {
        var $$ = this;
        return $$[textAnchorForAxisLabel]($$.config[__axis_rotated], $$[getYAxisLabelPosition]());
    };
    var textAnchorForY2AxisLabel = 'textAnchorForY2AxisLabel';
    c3_chart_internal_fn[textAnchorForY2AxisLabel] = function () {
        var $$ = this;
        return $$[textAnchorForAxisLabel]($$.config[__axis_rotated], $$[getY2AxisLabelPosition]());
    };

    var xForRotatedTickText = 'xForRotatedTickText';
    c3_chart_internal_fn[xForRotatedTickText] = function (r) {
        return 10 * Math.sin(Math.PI * (r / 180));
    };
    var yForRotatedTickText = 'yForRotatedTickText';
    c3_chart_internal_fn[yForRotatedTickText] = function (r) {
        return 11.5 - 2.5 * (r / 15);
    };
    var rotateTickText = 'rotateTickText';
    c3_chart_internal_fn[rotateTickText] = function (axis, transition, rotate) {
        axis.selectAll('.tick text')
            .style(CSS_TEXT_ANCHOR, "start");
        transition.selectAll('.tick text')
            .attr("y", this[yForRotatedTickText](rotate))
            .attr("x", this[xForRotatedTickText](rotate))
            .attr(CSS_TRANSFORM, "rotate(" + rotate + ")");
    };

    var getMaxTickWidth = 'getMaxTickWidth';
    c3_chart_internal_fn[getMaxTickWidth] = function (id) {
        var $$ = this, config = $$.config,
            maxWidth = 0, targetsToShow, scale, axis;
        if ($$.svg) {
            targetsToShow = $$[filterTargetsToShow]($$.data.targets);
            if (id === 'y') {
                scale = $$.y.copy().domain($$[getYDomain](targetsToShow, 'y'));
                axis = $$[getYAxis](scale, $$[yOrient], config[__axis_y_tick_format], config[__axis_y_ticks]);
            } else if (id === 'y2') {
                scale = $$.y2.copy().domain($$[getYDomain](targetsToShow, 'y2'));
                axis = $$[getYAxis](scale, $$[y2Orient], config[__axis_y2_tick_format], config[__axis_y2_ticks]);
            } else {
                scale = $$.x.copy().domain($$[getXDomain](targetsToShow));
                axis = $$[getXAxis](scale, $$[xOrient], $$[getXAxisTickFormat](), config[__axis_x_tick_values] ? config[__axis_x_tick_values] : $$.xAxis.tickValues());
            }
            $$.main.append("g").call(axis).each(function () {
                $$.d3.select(this).selectAll('text').each(function () {
                    var box = this.getBoundingClientRect();
                    if (maxWidth < box.width) { maxWidth = box.width; }
                });
            }).remove();
        }
        $$[currentMaxTickWidth] = maxWidth <= 0 ? $$[currentMaxTickWidth] : maxWidth;
        return $$[currentMaxTickWidth];
    };

    var updateAxisLabels = 'updateAxisLabels';
    c3_chart_internal_fn[updateAxisLabels] = function (withTransition) {
        var $$ = this;
        var axisXLabel = $$.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", generateCall($$[xForXAxisLabel], $$))
            .attr("dx", generateCall($$[dxForXAxisLabel], $$))
            .attr("dy", generateCall($$[dyForXAxisLabel], $$))
            .text(generateCall($$.textForXAxisLabel, $$));
        (withTransition ? axisYLabel.transition() : axisYLabel)
            .attr("x", generateCall($$[xForYAxisLabel], $$))
            .attr("dx", generateCall($$[dxForYAxisLabel], $$))
            .attr("dy", generateCall($$[dyForYAxisLabel], $$))
            .text(generateCall($$[textForYAxisLabel], $$));
        (withTransition ? axisY2Label.transition() : axisY2Label)
            .attr("x", generateCall($$[xForY2AxisLabel], $$))
            .attr("dx", generateCall($$[dxForY2AxisLabel], $$))
            .attr("dy", generateCall($$[dyForY2AxisLabel], $$))
            .text(generateCall($$[textForY2AxisLabel], $$));
    };

    var getAxisPadding = 'getAxisPadding';
    c3_chart_internal_fn[getAxisPadding] = function (padding, key, defaultValue, all) {
        var ratio = padding.unit === 'ratio' ? all : 1;
        return isValue(padding[key]) ? padding[key] * ratio : defaultValue;
    };

    var generateTickValues = 'generateTickValues';
    c3_chart_internal_fn[generateTickValues] = function (xs, tickCount) {
        var $$ = this;
        var tickValues = xs, targetCount, start, end, count, interval, i, tickValue;
        if (tickCount) {
            targetCount = isFunction(tickCount) ? tickCount() : tickCount;
            // compute ticks according to $$.config.axis_x_tick_count
            if (targetCount === 1) {
                tickValues = [xs[0]];
            } else if (targetCount === 2) {
                tickValues = [xs[0], xs[xs.length - 1]];
            } else if (targetCount > 2) {
                count = targetCount - 2;
                start = xs[0];
                end = xs[xs.length - 1];
                interval = (end - start) / (count + 1);
                // re-construct uniqueXs
                tickValues = [start];
                for (i = 0; i < count; i++) {
                    tickValue = +start + interval * (i + 1);
                    tickValues.push($$[isTimeSeries] ? new Date(tickValue) : tickValue);
                }
                tickValues.push(end);
            }
        }
        if (!$$[isTimeSeries]) { tickValues = tickValues.sort(function (a, b) { return a - b; }); }
        return tickValues;
    };


    /**
     *  c3.region.js
     */
    var regionX = 'regionX';
    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] ? $$[parseDate](d.start) : d.start) : 0);
        }
        return xPos;
    };
    var regionY = 'regionY';
    c3_chart_internal_fn[regionY] = function (d) {
        var $$ = 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;
    };
    var regionWidth = 'regionWidth';
    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;
    };
    var regionHeight = 'regionHeight';
    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;
    };
    var isRegionOnX = 'isRegionOnX';
    c3_chart_internal_fn[isRegionOnX] = function (d) {
        return !d.axis || d.axis === 'x';
    };




    //-- c3.arc.js --//

    var initPie = 'initPie', pie = 'pie';
    c3_chart_internal_fn[initPie] = function () {
        var $$ = this, d3 = $$.d3, config = $$.config;
        $$[pie] = d3.layout.pie().value(function (d) {
            return d.values.reduce(function (a, b) { return a + b.value; }, 0);
        });
        if (!config[__data_order] || !config[__pie_sort] || !config[__donut_sort]) {
            $$[pie].sort(null);
        }
    };

    var updateRadius = 'updateRadius';
    c3_chart_internal_fn[updateRadius] = function () {
        var $$ = this, config = $$.config,
            w = config[__gauge_width] || config[__donut_width];
        $$.radiusExpanded = Math.min($$.arcWidth, $$.arcHeight) / 2;
        $$.radius = $$.radiusExpanded * 0.95;
        $$.innerRadiusRatio = w ? ($$.radius - w) / $$.radius : 0.6;
        $$.innerRadius = $$[hasType]($$.data.targets, TYPE_DONUT) || $$[hasType]($$.data.targets, TYPE_GAUGE) ? $$.radius * $$.innerRadiusRatio : 0;
    };

    var updateArc = 'updateArc', svgArc = 'svgArc', svgArcExpanded = 'svgArcExpanded', svgArcExpandedSub = 'svgArcExpandedSub';
    c3_chart_internal_fn[updateArc] = function () {
        var $$ = this;
        $$[svgArc] = $$[getSvgArc]();
        $$[svgArcExpanded] = $$[getSvgArcExpanded]();
        $$[svgArcExpandedSub] = $$[getSvgArcExpanded](0.98);
    };

    var updateAngle = 'updateAngle';
    c3_chart_internal_fn[updateAngle] = function (d) {
        var $$ = this, config = $$.config,
            found = false, index = 0;
        $$[pie]($$[filterTargetsToShow]($$.data.targets)).sort($$.descByStartAngle).forEach(function (t) {
            if (! found && t.data.id === d.data.id) {
                found = true;
                d = t;
                d.index = index;
            }
            index++;
        });
        if (isNaN(d.endAngle)) {
            d.endAngle = d.startAngle;
        }
        if ($$[isGaugeType](d.data)) {
            var gMin = config[__gauge_min], gMax = config[__gauge_max],
                gF = Math.abs(gMin) + gMax,
                aTic = (Math.PI) / gF;
            d.startAngle = (-1 * (Math.PI / 2)) + (aTic * Math.abs(gMin));
            d.endAngle = d.startAngle + (aTic * ((d.value > gMax) ? gMax : d.value));
        }
        return found ? d : null;
    };

    var getSvgArc = 'getSvgArc';
    c3_chart_internal_fn[getSvgArc] = function () {
        var $$ = this,
            arc = $$.d3.svg.arc().outerRadius($$.radius).innerRadius($$.innerRadius),
            newArc = function (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;
    };

    var getSvgArcExpanded = 'getSvgArcExpanded';
    c3_chart_internal_fn[getSvgArcExpanded] = function (rate) {
        var $$ = this,
            arc = $$.d3.svg.arc().outerRadius($$.radiusExpanded * (rate ? rate : 1)).innerRadius($$.innerRadius);
        return function (d) {
            var updated = $$[updateAngle](d);
            return updated ? arc(updated) : "M 0 0";
        };
    };

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


    var transformForArcLabel = 'transformForArcLabel';
    c3_chart_internal_fn[transformForArcLabel] = function (d) {
        var $$ = this,
            updated = $$[updateAngle](d), c, x, y, h, ratio, translate = "";
        if (updated && !$$[hasType]($$.data.targets, TYPE_GAUGE)) {
            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);
            // TODO: ratio should be an option?
            ratio = $$.radius && h ? (36 / $$.radius > 0.375 ? 1.175 - 36 / $$.radius : 0.8) * $$.radius / h : 0;
            translate = "translate(" + (x * ratio) +  ',' + (y * ratio) +  ")";
        }
        return translate;
    };

    var getArcRatio = 'getArcRatio';
    c3_chart_internal_fn[getArcRatio] = function (d) {
        var $$ = this,
            whole = $$[hasType]($$.data.targets, TYPE_GAUGE) ? Math.PI : (Math.PI * 2);
        return d ? (d.endAngle - d.startAngle) / whole : null;
    };

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

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

    var expandArc = 'expandArc';
    c3_chart_internal_fn[expandArc] = function (id, withoutFadeOut) {
        var $$ = this,
            target = $$.svg.selectAll('.' + CLASS[chartArc] + $$[selectorTarget](id)),
            noneTargets = $$.svg.selectAll('.' + CLASS[arc]).filter(function (data) { return data.data.id !== id; });

        if ($$[shouldExpand](id)) {
            target.selectAll('path')
              .transition().duration(50)
                .attr("d", $$[svgArcExpanded])
              .transition().duration(100)
                .attr("d", $$[svgArcExpandedSub])
                .each(function (d) {
                    if ($$[isDonutType](d.data)) {
                        // callback here
                    }
                });
        }
        if (!withoutFadeOut) {
            noneTargets.style(CSS_OPACITY, 0.3);
        }
    };

    var unexpandArc = 'unexpandArc';
    c3_chart_internal_fn[unexpandArc] = function (id) {
        var $$ = this,
            target = $$.svg.selectAll('.' + CLASS[chartArc] + $$[selectorTarget](id));
        target.selectAll('path.' + CLASS[arc])
          .transition().duration(50)
            .attr("d", $$.svgArc);
        $$.svg.selectAll('.' + CLASS[arc])
            .style(CSS_OPACITY, 1);
    };

    var shouldExpand = 'shouldExpand';
    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]);
    };

    var shouldShowArcLabel = 'shouldShowArcLabel';
    c3_chart_internal_fn[shouldShowArcLabel] = function () {
        var $$ = this, config = $$.config, shouldShow = true;
        if ($$[hasType]($$.data.targets, TYPE_DONUT)) {
            shouldShow = config[__donut_label_show];
        } else if ($$[hasType]($$.data.targets, TYPE_PIE)) {
            shouldShow = config[__pie_label_show];
        }
        // when gauge, always true
        return shouldShow;
    };

    var meetsArcLabelThreshold = 'meetsArcLabelThreshold';
    c3_chart_internal_fn[meetsArcLabelThreshold] = function (ratio) {
        var $$ = this, config = $$.config,
            threshold = $$[hasType]($$.data.targets, TYPE_DONUT) ? config[__donut_label_threshold] : config[__pie_label_threshold];
        return ratio >= threshold;
    };

    var getArcLabelFormat = 'getArcLabelFormat';
    c3_chart_internal_fn[getArcLabelFormat] = function () {
        var $$ = this, config = $$.config,
            format = config[__pie_label_format];
        if ($$[hasType]($$.data.targets, TYPE_GAUGE)) {
            format = config[__gauge_label_format];
        } else if ($$[hasType]($$.data.targets, TYPE_DONUT)) {
            format = config[__donut_label_format];
        }
        return format;
    };

    var getArcTitle = 'getArcTitle';
    c3_chart_internal_fn[getArcTitle] = function () {
        var $$ = this;
        return $$[hasType]($$.data.targets, TYPE_DONUT) ? $$.config[__donut_title] : "";
    };

    var descByStartAngle = 'descByStartAngle';
    c3_chart_internal_fn[descByStartAngle] = function (a, b) {
        return a.startAngle - b.startAngle;
    };

    var updateTargetsForArc = 'updateTargetsForArc';
    c3_chart_internal_fn[updateTargetsForArc] = function (targets) {
        var $$ = this, main = $$.main, mainPieUpdate, mainPieEnter;
        mainPieUpdate = main.select('.' + CLASS[chartArcs]).selectAll('.' + CLASS[chartArc])
            .data($$[pie](targets))
            .attr(CSS_CLASS, generateCall($$[classChartArc], $$));
        mainPieEnter = mainPieUpdate.enter().append("g")
            .attr(CSS_CLASS, generateCall($$[classChartArc], $$));
        mainPieEnter.append('g')
            .attr(CSS_CLASS, generateCall($$[classArcs], $$));
        mainPieEnter.append("text")
            .attr("dy", $$[hasType]($$.data.targets, TYPE_GAUGE) ? "-0.35em" : ".35em")
            .style(CSS_OPACITY, 0)
            .style(CSS_TEXT_ANCHOR, "middle")
            .style(CSS_POINTER_EVENTS, "none");
        // MEMO: can not keep same color..., but not bad to update color in redraw
        //mainPieUpdate.exit().remove();
    };

    var initArc = 'initArc';
    c3_chart_internal_fn[initArc] = function () {
        var $$ = this, arcs;
        arcs = $$.main.select('.' + CLASS[chart]).append("g")
            .attr(CSS_CLASS, CLASS[chartArcs])
            .attr(CSS_TRANSFORM, $$[translate].arc);
        arcs.append('text')
            .attr(CSS_CLASS, CLASS[chartArcsTitle])
            .style(CSS_TEXT_ANCHOR, "middle")
            .text($$[getArcTitle]());
    };

    var redrawArc = 'redrawArc';
    c3_chart_internal_fn[redrawArc] = function (duration, durationForExit, withTransform) {
        var $$ = this, d3 = $$.d3, config = $$.config, main = $$.main,
            mainArc;
        mainArc = main.selectAll('.' + CLASS[arcs]).selectAll('.' + CLASS[arc])
            .data(generateCall($$[arcData], $$));
        mainArc.enter().append('path')
            .attr(CSS_CLASS, generateCall($$[classArc], $$))
            .style("fill", function (d) { return $$[color](d.data); })
            .style("cursor", function (d) { return config[__data_selection_isselectable](d) ? "pointer" : null; })
            .style(CSS_OPACITY, 0)
            .each(function (d) {
                if ($$[isGaugeType](d.data)) {
                    d.startAngle = d.endAngle = -1 * (Math.PI / 2);
                }
                this._current = d;
            })
            .on('mouseover', function (d) {
                var updated, arcData;
                if ($$[transiting]) { // skip while transiting
                    return;
                }
                updated = $$[updateAngle](d);
                arcData = $$[convertToArcData](updated);
                // transitions
                $$[expandArc](updated.data.id);
                $$[toggleFocusLegend](updated.data.id, true);
                $$.config[__data_onmouseover](arcData, this);
            })
            .on('mousemove', function (d) {
                var updated = $$[updateAngle](d),
                    arcData = $$[convertToArcData](updated),
                    selectedData = [arcData];
                $$[showTooltip](selectedData, d3.mouse(this));
            })
            .on('mouseout', function (d) {
                var updated, arcData;
                if ($$[transiting]) { // skip while transiting
                    return;
                }
                updated = $$[updateAngle](d);
                arcData = $$[convertToArcData](updated);
                // transitions
                $$[unexpandArc](updated.data.id);
                $$[revertLegend]();
                $$[hideTooltip]();
                $$.config[__data_onmouseout](arcData, this);
            })
            .on('click', function (d, i) {
                var updated = $$[updateAngle](d),
                    arcData = $$[convertToArcData](updated);
                $$[toggleShape](this, arcData, i); // onclick called in toogleShape()
            });
        mainArc
            .attr(CSS_TRANSFORM, function (d) { return !$$[isGaugeType](d.data) && withTransform ? "scale(0)" : ""; })
            .style(CSS_OPACITY, function (d) { return d === this._current ? 0 : 1; })
            .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.endAngle)) {
                    this._current.endAngle = this._current.startAngle;
                }
                interpolate = d3.interpolate(this._current, updated);
                this._current = interpolate(0);
                return function (t) { return $$[getArc](interpolate(t), true); };
            })
            .attr(CSS_TRANSFORM, withTransform ? "scale(1)" : "")
            .style("fill", function (d) {
                return $$[levelColor] ? $$[levelColor](d.data.values[0].value) : $$[color](d.data.id);
            }) // Where gauge reading color would receive customization.
            .style(CSS_OPACITY, 1)
            .call($$.endall, function () {
                $$[transiting] = false;
            });
        mainArc.exit().transition().duration(durationForExit)
            .style(CSS_OPACITY, 0)
            .remove();
        main.selectAll('.' + CLASS[chartArc]).select('text')
            .style(CSS_OPACITY, 0)
            .attr(CSS_CLASS, function (d) { return $$[isGaugeType](d.data) ? CLASS[gaugeValue] : ''; })
            .text(generateCall($$[textForArcLabel], $$))
            .attr(CSS_TRANSFORM, generateCall($$[transformForArcLabel], $$))
          .transition().duration(duration)
            .style(CSS_OPACITY, function (d) { return $$[isTargetToShow](d.data.id) && $$[isArcType](d.data) ? 1 : 0; });
        main.select('.' + CLASS[chartArcsTitle])
            .style(CSS_OPACITY, $$[hasType]($$.data.targets, TYPE_DONUT) || $$[hasType]($$.data.targets, TYPE_GAUGE) ? 1 : 0);

    };

    //-- gauge.js --//

    var initGauge = 'initGauge';
    c3_chart_internal_fn[initGauge] = function () {
        var $$ = this, config = $$.config, arcs;
        if ($$[hasType]($$.data.targets, TYPE_GAUGE)) {
            arcs.append('path')
                .attr(CSS_CLASS, CLASS[chartArcsBackground])
                .attr("d", function () {
                    var d = {
                        data: [{value: config[__gauge_max]}],
                        startAngle: -1 * (Math.PI / 2),
                        endAngle: Math.PI / 2
                    };
                    return $$[getArc](d, true, true);
                });
            arcs.append("text")
                .attr("dy", ".75em")
                .attr(CSS_CLASS, CLASS[chartArcsGaugeUnit])
                .style(CSS_TEXT_ANCHOR, "middle")
                .style(CSS_POINTER_EVENTS, "none")
                .text(config[__gauge_label_show] ? config[__gauge_units] : '');
            arcs.append("text")
                .attr("dx", -1 * ($$.innerRadius + (($$.radius - $$.innerRadius) / 2)) + "px")
                .attr("dy", "1.2em")
                .attr(CSS_CLASS, CLASS[chartArcsGaugeMin])
                .style(CSS_TEXT_ANCHOR, "middle")
                .style(CSS_POINTER_EVENTS, "none")
                .text(config[__gauge_label_show] ? config[__gauge_min] : '');
            arcs.append("text")
                .attr("dx", $$.innerRadius + (($$.radius - $$.innerRadius) / 2) + "px")
                .attr("dy", "1.2em")
                .attr(CSS_CLASS, CLASS[chartArcsGaugeMax])
                .style(CSS_TEXT_ANCHOR, "middle")
                .style(CSS_POINTER_EVENTS, "none")
                .text(config[__gauge_label_show] ? config[__gauge_max] : '');
        }
    };


    /**
     *  c3.cache.js
     */
    var hasCaches = 'hasCaches';
    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;
    };
    var addCache = 'addCache';
    c3_chart_internal_fn[addCache] = function (id, target) {
        this.cache[id] = this[cloneTarget](target);
    };
    var getCaches = 'getCaches';
    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;
    };

    //-- subchart.js --//

    var initBrush = 'initBrush';
    c3_chart_internal_fn[initBrush] = function () {
        var $$ = this, d3 = $$.d3;
        $$.brush = d3.svg.brush().on("brush", function () { $$[redrawForBrush](); });
        $$.brush.update = function () {
            if ($$.context) { $$.context.select('.' + CLASS[brush]).call(this); }
            return this;
        };
        $$.brush.scale = function (scale) {
            return $$.config[__axis_rotated] ? this[y](scale) : this[x](scale);
        };
    };
    var initSubchart = 'initSubchart';
    c3_chart_internal_fn[initSubchart] = function () {
        var $$ = this, config = $$.config,
            context = $$.context = $$.svg.append("g").attr(CSS_TRANSFORM, $$[translate].context);

        if (!config[__subchart_show]) {
            context.style(CSS_VISIBILITY, 'hidden');
        }

        // Define g for chart area
        context.append('g')
            .attr("clip-path", $$[clipPath])
            .attr(CSS_CLASS, CLASS[chart]);

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

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

        // Add extent rect for Brush
        context.append("g")
            .attr("clip-path", $$[clipPath])
            .attr(CSS_CLASS, CLASS[brush])
            .call($$.brush)
          .selectAll("rect")
            .attr(config[__axis_rotated] ? "width" : "height", config[__axis_rotated] ? $$.width2 : $$.height2);

        // ATTENTION: This must be called AFTER chart added
        // Add Axis
        $$.axes.subx = context.append("g")
            .attr(CSS_CLASS, CLASS[axisX])
            .attr(CSS_TRANSFORM, $$[translate].subx)
            .attr("clip-path", config[__axis_rotated] ? "" : $$[clipPathForXAxis]);
    };
    var updateTargetsForSubchart = 'updateTargetsForSubchart';
    c3_chart_internal_fn[updateTargetsForSubchart] = function (targets) {
        var $$ = this, context = $$.context, config = $$.config,
            contextLineEnter, contextLineUpdate, contextBarEnter, contextBarUpdate;

        if (config[__subchart_show]) {

            contextBarUpdate = context.select('.' + CLASS[chartBars]).selectAll('.' + CLASS[chartBar])
                .data(targets)
                .attr(CSS_CLASS, generateCall($$[classChartBar], $$));
            contextBarEnter = contextBarUpdate.enter().append('g')
                .style(CSS_OPACITY, 0)
                .attr(CSS_CLASS, generateCall($$[classChartBar], $$));
            // Bars for each data
            contextBarEnter.append('g')
                .attr(CSS_CLASS, generateCall($$[classBars], $$));

            //-- Line --//
            contextLineUpdate = context.select('.' + CLASS[chartLines]).selectAll('.' + CLASS[chartLine])
                .data(targets)
                .attr(CSS_CLASS, generateCall($$[classChartLine], $$));
            contextLineEnter = contextLineUpdate.enter().append('g')
                .style(CSS_OPACITY, 0)
                .attr(CSS_CLASS, generateCall($$[classChartLine], $$));
            // Lines for each data
            contextLineEnter.append("g")
                .attr(CSS_CLASS, generateCall($$[classLines], $$));
            // Area
            contextLineEnter.append("g")
                .attr(CSS_CLASS, generateCall($$[classAreas], $$));
        }
    };
    var redrawSubchart = 'redrawSubchart';
    c3_chart_internal_fn[redrawSubchart] = function (withSubchart, transitions, duration, durationForExit, areaIndices, barIndices, lineIndices) {
        var $$ = this, d3 = $$.d3, context = $$.context, config = $$.config,
            contextLine,  contextArea, contextBar, drawAreaOnSub, drawBarOnSub, drawLineOnSub;

        // subchart
        if (config[__subchart_show]) {
            // reflect main chart to extent on subchart if zoomed
            if (d3.event && d3.event.type === 'zoom') {
                $$.brush.extent($$.x.orgDomain()).update();
            }
            // update subchart elements if needed
            if (withSubchart) {

                // rotate tick text if needed
                if (!config[__axis_rotated] && config[__axis_x_tick_rotate]) {
                    $$[rotateTickText]($$.axes.subx, transitions.axisSubX, config[__axis_x_tick_rotate]);
                }

                // extent rect
                if (!$$.brush.empty()) {
                    $$.brush.extent($$.x.orgDomain()).update();
                }
                // setup drawer - MEMO: this must be called after axis updated
                drawAreaOnSub = $$[generateDrawArea](areaIndices, true);
                drawBarOnSub = $$[generateDrawBar](barIndices, true);
                drawLineOnSub = $$[generateDrawLine](lineIndices, true);
                // bars
                contextBar = context.selectAll('.' + CLASS[bars]).selectAll('.' + CLASS[bar])
                    .data(generateCall($$[barData], $$));
                contextBar.enter().append('path')
                    .attr(CSS_CLASS, generateCall($$[classBar], $$))
                    .style("stroke", 'none')
                    .style("fill", $$.color);
                contextBar
                    .style(CSS_OPACITY, generateCall($$[initialOpacity], $$))
                  .transition().duration(duration)
                    .attr('d', drawBarOnSub)
                    .style(CSS_OPACITY, 1);
                contextBar.exit().transition().duration(duration)
                    .style(CSS_OPACITY, 0)
                    .remove();
                // lines
                contextLine = context.selectAll('.' + CLASS[lines]).selectAll('.' + CLASS[line])
                    .data(generateCall($$[lineData], $$));
                contextLine.enter().append('path')
                    .attr(CSS_CLASS, generateCall($$[classLine], $$))
                    .style('stroke', $$.color);
                contextLine
                    .style(CSS_OPACITY, generateCall($$[initialOpacity], $$))
                  .transition().duration(duration)
                    .attr("d", drawLineOnSub)
                    .style(CSS_OPACITY, 1);
                contextLine.exit().transition().duration(duration)
                    .style(CSS_OPACITY, 0)
                    .remove();
                // area
                contextArea = context.selectAll('.' + CLASS[areas]).selectAll('.' + CLASS[area])
                    .data(generateCall($$[lineData], $$));
                contextArea.enter().append('path')
                    .attr(CSS_CLASS, generateCall($$[classArea], $$))
                    .style("fill", $$.color)
                    .style(CSS_OPACITY, function () { $$.orgAreaOpacity = +d3.select(this).style(CSS_OPACITY); return 0; });
                contextArea
                    .style(CSS_OPACITY, 0)
                  .transition().duration(duration)
                    .attr("d", drawAreaOnSub)
                    .style("fill", $$.color)
                    .style(CSS_OPACITY, $$.orgAreaOpacity);
                contextArea.exit().transition().duration(durationForExit)
                    .style(CSS_OPACITY, 0)
                    .remove();
            }
        }
    };
    var redrawForBrush = 'redrawForBrush';
    c3_chart_internal_fn[redrawForBrush] = function () {
        var $$ = this, x = $$.x;
        $$[redraw]({
            withTransition: false,
            withY: false,
            withSubchart: false,
            withUpdateXDomain: true
        });
        $$.config[__subchart_onbrush].call($$, x.orgDomain());
    };
    var transformContext = 'transformContext';
    c3_chart_internal_fn[transformContext] = function (withTransition, transitions) {
        var $$ = this, subXAxis;
        if (transitions && transitions.axisSubX) {
            subXAxis = transitions.axisSubX;
        } else {
            subXAxis = $$.context.select('.' + CLASS[axisX]);
            if (withTransition) { subXAxis = subXAxis.transition(); }
        }
        $$.context.attr(CSS_TRANSFORM, $$[translate].context);
        subXAxis.attr(CSS_TRANSFORM, $$[translate].subx);
    };


    /**
     *  c3.zoom.js
     */
    var updateZoom = 'updateZoom';
    c3_chart_internal_fn[updateZoom] = function () {
        var $$ = this, z = $$.config[__zoom_enabled] ? $$.zoom : function () {};
        $$.main.select('.' + CLASS[zoomRect]).call(z);
        $$.main.selectAll('.' + CLASS[eventRect]).call(z);
    };




    /**
     *  c3.util.js
     */
    var isValue = c3_chart_internal_fn.isValue = function (v) {
        return v || v === 0;
    },
    isFunction = c3_chart_internal_fn.isFunction = function (o) {
        return typeof o === 'function';
    },
    isString = c3_chart_internal_fn.isString = function (o) {
        return typeof o === 'string';
    },
    isDefined = c3_chart_internal_fn.isDefined = function (v) {
        return typeof v !== 'undefined';
    },
    ceil10 = c3_chart_internal_fn.ceil10 = function (v) {
        return Math.ceil(v / 10) * 10;
    },
    asHalfPixel = c3_chart_internal_fn.asHalfPixel = function (n) {
        return Math.ceil(n) + 0.5;
    },
    diffDomain = c3_chart_internal_fn.diffDomain = function (d) {
        return d[1] - d[0];
    },
    isEmpty = c3_chart_internal_fn.isEmpty = function (o) {
        return !o || (isString(o) && o.length === 0) || (typeof o === 'object' && Object.keys(o).length === 0);
    },
    notEmpty = c3_chart_internal_fn.notEmpty = function (o) {
        return Object.keys(o).length > 0;
    },
    getOption = c3_chart_internal_fn.getOption = function (options, key, defaultValue) {
        return isDefined(options[key]) ? options[key] : defaultValue;
    },
    hasValue = c3_chart_internal_fn.hasValue = function (dict, value) {
        var found = false;
        Object.keys(dict).forEach(function (key) {
            if (dict[key] === value) { found = true; }
        });
        return found;
    },
    getPathBox = c3_chart_internal_fn.getPathBox = function (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};
    },
    generateCall = c3_chart_internal_fn.generateCall = function (f, context) {
        return function (d, i) { return f.call(context, d, i); };
    };

    var getTextRect = 'getTextRect';
    c3_chart_internal_fn[getTextRect] = function (text, cls) {
        var rect;
        this.d3.select('body').selectAll('.dummy')
            .data([text])
          .enter().append('text')
            .classed(cls ? cls : "", true)
            .text(text)
          .each(function () { rect = this.getBoundingClientRect(); })
            .remove();
        return rect;
    };


    /**
     *  c3.selection.js
     */
    var selectPoint = 'selectPoint';
    c3_chart_internal_fn[selectPoint] = function (target, d, i) {
        var $$ = this, config = $$.config;
        config[__data_onselected](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(CSS_CLASS, function () { return $$[generateClass](CLASS[selectedCircle], i); })
            .attr("cx", config[__axis_rotated] ? $$.circleY : $$.circleX)
            .attr("cy", config[__axis_rotated] ? $$.circleX : $$.circleY)
            .attr("stroke", function () { return $$[color](d); })
            .attr("r", $$[pointSelectR](d) * 1.4)
          .transition().duration(100)
            .attr("r", $$.pointSelectR);
    };
    var unselectPoint = 'unselectPoint';
    c3_chart_internal_fn[unselectPoint] = function (target, d, i) {
        var $$ = this;
        $$.config[__data_onunselected](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();
    };
    var togglePoint = 'togglePoint';
    c3_chart_internal_fn[togglePoint] = function (selected, target, d, i) {
        selected ? this[selectPoint](target, d, i) : this[unselectPoint](target, d, i);
    };
    var selectBar = 'selectBar';
    c3_chart_internal_fn[selectBar] = function (target, d) {
        var $$ = this;
        $$.config[__data_onselected].call($$, d, target.node());
        target.transition().duration(100)
            .style("fill", function () { return $$.d3.rgb($$[color](d)).brighter(0.75); });
    };
    var unselectBar = 'unselectBar';
    c3_chart_internal_fn[unselectBar] = function (target, d) {
        var $$ = this;
        $$.config[__data_onunselected].call($$, d, target.node());
        target.transition().duration(100)
            .style("fill", function () { return $$[color](d); });
    };
    var toggleBar = 'toggleBar';
    c3_chart_internal_fn[toggleBar] = function (selected, target, d, i) {
        selected ? this[selectBar](target, d, i) : this[unselectBar](target, d, i);
    };
    var toggleArc = 'toggleArc';
    c3_chart_internal_fn[toggleArc] = function (selected, target, d, i) {
        this[toggleBar](selected, target, d.data, i);
    };
    var getToggle = 'getToggle';
    c3_chart_internal_fn[getToggle] = function (that) {
        var $$ = this;
        // path selection not supported yet
        return that.nodeName === 'circle' ? $$.togglePoint : ($$.d3.select(that).classed(CLASS[bar]) ? $$.toggleBar : $$.toggleArc);
    };
    var toggleShape = 'toggleShape';
    c3_chart_internal_fn[toggleShape] = function (that, d, i) {
        var $$ = this, d3 = $$.d3, config = $$.config,
            shape = d3.select(that), isSelected = shape.classed(CLASS[SELECTED]), isWithin, toggle;
        if (that.nodeName === 'circle') {
            isWithin = $$[isWithinCircle](that, $$[pointSelectR](d) * 1.5);
            toggle = $$.togglePoint;
        }
        else if (that.nodeName === 'path') {
            if (shape.classed(CLASS[bar])) {
                isWithin = $$[isWithinBar](that);
                toggle = $$.toggleBar;
            } else { // would be arc
                isWithin = true;
                toggle = $$.toggleArc;
            }
        }
        if (config[__data_selection_grouped] || isWithin) {
            if (config[__data_selection_enabled] && config[__data_selection_isselectable](d)) {
                if (!config[__data_selection_multiple]) {
                    $$.main.selectAll('.' + CLASS[shapes] + (config[__data_selection_grouped] ? $$[getTargetSelectorSuffix](d.id) : "")).selectAll('.' + CLASS[shape]).each(function (d, i) {
                        var shape = d3.select(this);
                        if (shape.classed(CLASS[SELECTED])) { toggle(false, shape.classed(CLASS[SELECTED], false), d, i); }
                    });
                }
                shape.classed(CLASS[SELECTED], !isSelected);
                toggle(!isSelected, shape, d, i);
            }
            $$.config[__data_onclick](d, that);
        }
    };


    /**
     *  c3.transition.js
     */
    var generateAxisTransitions = 'generateAxisTransitions';
    c3_chart_internal_fn[generateAxisTransitions] = function (duration) {
        var $$ = this, axes = $$.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
        };
    };
    var endall = 'endall';
    c3_chart_internal_fn[endall] = function (transition, callback) {
        var n = 0;
        transition
            .each(function () { ++n; })
            .each("end", function () {
                if (!--n) { callback.apply(this, arguments); }
            });
    };
    var generateWait = 'generateWait';
    c3_chart_internal_fn[generateWait] = function () {
        var transitionsToWait = [],
            f = function (transition, 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(); }
                    }
                }, 10);
            };
        f.add = function (transition) {
            transitionsToWait.push(transition);
        };
        return f;
    };


    /**
     *  c3.transform.js
     */
    var transformTo = 'transformTo';
    c3_chart_internal_fn[transformTo] = function (targetIds, type, optionsForRedraw) {
        var $$ = this,
            withTransitionForAxis = !$$[hasArcType]($$.data.targets),
            options = optionsForRedraw || {withTransitionForAxis: withTransitionForAxis};
        options.withTransitionForTransform = false;
        $$[transiting] = false;
        $$[setTargetType](targetIds, type);
        $$[updateAndRedraw](options);
    };


    /**
     * c3.class.js
     */
    var target = 'target',
        chart  = 'chart ',
        chartLine = 'chartLine',
        chartLines = 'chartLines',
        chartBar = 'chartBar',
        chartBars = 'chartBars',
        chartText = 'chartText',
        chartTexts = 'chartTexts',
        chartArc = 'chartArc',
        chartArcs = 'chartArcs',
        chartArcsTitle = 'chartArcsTitle',
        chartArcsBackground = 'chartArcsBackground',
        chartArcsGaugeUnit = 'chartArcsGaugeUnit',
        chartArcsGaugeMax = 'chartArcsGaugeMax',
        chartArcsGaugeMin = 'chartArcsGaugeMin',
        selectedCircle = 'selectedCircle',
        selectedCircles = 'selectedCircles',
        eventRect = 'eventRect',
        eventRects = 'eventRects',
        eventRectsSingle = 'eventRectsSingle',
        eventRectsMultiple = 'eventRectsMultiple',
        zoomRect = 'zoomRect',
        brush = 'brush',
        focused = 'focused',
        region = 'region',
        regions = 'regions',
        tooltip = 'tooltip',
        tooltipName = 'tooltipName',
        shape = 'shape',
        shapes = 'shapes',
        line = 'line',
        lines = 'lines',
        bar = 'bar',
        bars = 'bars',
        circle = 'circle',
        circles = 'circles',
        arc = 'arc',
        arcs = 'arcs',
        area = 'area',
        areas = 'areas',
        empty = 'empty',
        text = 'text',
        texts = 'texts',
        gaugeValue = 'gaugeValue',
        grid = 'grid',
        xgrid = 'xgrid',
        xgrids = 'xgrids',
        xgridLine = 'xgridLine',
        xgridLines = 'xgridLines',
        xgridFocus = 'xgridFocus',
        ygrid = 'ygrid',
        ygrids = 'ygrids',
        ygridLine = 'ygridLine',
        ygridLines = 'ygridLines',
        axis = 'axis',
        axisX = 'axisX',
        axisXLabel = 'axisXLabel',
        axisY = 'axisY',
        axisYLabel = 'axisYLabel',
        axisY2 = 'axisY2',
        axisY2Label = 'axisY2Label',
        legendBackground = 'legendBackground',
        legendItem = 'legendItem',
        legendItemEvent = 'legendItemEvent',
        legendItemTile = 'legendItemTile',
        legendItemHidden = 'legendItemHidden',
        legendItemFocused = 'legendItemFocused',
        dragarea = 'dragarea',
        EXPANDED = 'EXPANDED',
        SELECTED = 'SELECTED',
        INCLUDED = 'INCLUDED';

    var CLASS = c3_chart_internal_fn.CLASS = {};
    CLASS[target] = 'c3-target';
    CLASS[chart] = 'c3-chart';
    CLASS[chartLine] = 'c3-chart-line';
    CLASS[chartLines] = 'c3-chart-lines';
    CLASS[chartBar] = 'c3-chart-bar';
    CLASS[chartBars] = 'c3-chart-bars';
    CLASS[chartText] = 'c3-chart-text';
    CLASS[chartTexts] = 'c3-chart-texts';
    CLASS[chartArc] = 'c3-chart-arc';
    CLASS[chartArcs] = 'c3-chart-arcs';
    CLASS[chartArcsTitle] = 'c3-chart-arcs-title';
    CLASS[chartArcsBackground] = 'c3-chart-arcs-background';
    CLASS[chartArcsGaugeUnit] = 'c3-chart-arcs-gauge-unit';
    CLASS[chartArcsGaugeMax] = 'c3-chart-arcs-gauge-max';
    CLASS[chartArcsGaugeMin] = 'c3-chart-arcs-gauge-min';
    CLASS[selectedCircle] = 'c3-selected-circle';
    CLASS[selectedCircles] = 'c3-selected-circles';
    CLASS[eventRect] = 'c3-event-rect';
    CLASS[eventRects] = 'c3-event-rects';
    CLASS[eventRectsSingle] = 'c3-event-rects-single';
    CLASS[eventRectsMultiple] = 'c3-event-rects-multiple';
    CLASS[zoomRect] = 'c3-zoom-rect';
    CLASS[brush] = 'c3-brush';
    CLASS[focused] = 'c3-focused';
    CLASS[region] = 'c3-region';
    CLASS[regions] = 'c3-regions';
    CLASS[tooltip] = 'c3-tooltip';
    CLASS[tooltipName] = 'c3-tooltip-name';
    CLASS[shape] = 'c3-shape';
    CLASS[shapes] = 'c3-shapes';
    CLASS[line] = 'c3-line';
    CLASS[lines] = 'c3-lines';
    CLASS[bar] = 'c3-bar';
    CLASS[bars] = 'c3-bars';
    CLASS[circle] = 'c3-circle';
    CLASS[circles] = 'c3-circles';
    CLASS[arc] = 'c3-arc';
    CLASS[arcs] = 'c3-arcs';
    CLASS[area] = 'c3-area';
    CLASS[areas] = 'c3-areas';
    CLASS[empty] = 'c3-empty';
    CLASS[text] = 'c3-text';
    CLASS[texts] = 'c3-texts';
    CLASS[gaugeValue] = 'c3-gauge-value';
    CLASS[grid] = 'c3-grid';
    CLASS[xgrid] = 'c3-xgrid';
    CLASS[xgrids] = 'c3-xgrids';
    CLASS[xgridLine] = 'c3-xgrid-line';
    CLASS[xgridLines] = 'c3-xgrid-lines';
    CLASS[xgridFocus] = 'c3-xgrid-focus';
    CLASS[ygrid] = 'c3-ygrid';
    CLASS[ygrids] = 'c3-ygrids';
    CLASS[ygridLine] = 'c3-ygrid-line';
    CLASS[ygridLines] = 'c3-ygrid-lines';
    CLASS[axis] = 'c3-axis';
    CLASS[axisX] = 'c3-axis-x';
    CLASS[axisXLabel] = 'c3-axis-x-label';
    CLASS[axisY] = 'c3-axis-y';
    CLASS[axisYLabel] = 'c3-axis-y-label';
    CLASS[axisY2] = 'c3-axis-y2';
    CLASS[axisY2Label] = 'c3-axis-y2-label';
    CLASS[legendBackground] = 'c3-legend-background';
    CLASS[legendItem] = 'c3-legend-item';
    CLASS[legendItemEvent] = 'c3-legend-item-event';
    CLASS[legendItemTile] = 'c3-legend-item-tile';
    CLASS[legendItemHidden] = 'c3-legend-item-hidden';
    CLASS[legendItemFocused] = 'c3-legend-item-focused';
    CLASS[dragarea] = 'c3-dragarea';
    CLASS[EXPANDED] = '_expanded_';
    CLASS[SELECTED] = '_selected_';
    CLASS[INCLUDED] = '_included_';

    var generateClass = 'generateClass';
    c3_chart_internal_fn[generateClass] = function (prefix, targetId) {
        return " " + prefix + " " + prefix + this[getTargetSelectorSuffix](targetId);
    };
    var classText = 'classText';
    c3_chart_internal_fn[classText] = function (d) {
        return this[generateClass](CLASS[text], d.index);
    };
    var classTexts = 'classTexts';
    c3_chart_internal_fn[classTexts] = function (d) {
        return this[generateClass](CLASS[texts], d.id);
    };
    var classShape = 'classShape';
    c3_chart_internal_fn[classShape] = function (d) {
        return this[generateClass](CLASS[shape], d.index);
    };
    var classShapes = 'classShapes';
    c3_chart_internal_fn[classShapes] = function (d) {
        return this[generateClass](CLASS[shapes], d.id);
    };
    var classLine = 'classLine';
    c3_chart_internal_fn[classLine] = function (d) {
        return this[classShape](d) + this[generateClass](CLASS[line], d.id);
    };
    var classLines = 'classLines';
    c3_chart_internal_fn[classLines] = function (d) {
        return this[classShapes](d) + this[generateClass](CLASS[lines], d.id);
    };
    var classCircle = 'classCircle';
    c3_chart_internal_fn[classCircle] = function (d) {
        return this[classShape](d) + this[generateClass](CLASS[circle], d.index);
    };
    var classCircles = 'classCircles';
    c3_chart_internal_fn[classCircles] = function (d) {
        return this[classShapes](d) + this[generateClass](CLASS[circles], d.id);
    };
    var classBar = 'classBar';
    c3_chart_internal_fn[classBar] = function (d) {
        return this[classShape](d) + this[generateClass](CLASS[bar], d.index);
    };
    var classBars = 'classBars';
    c3_chart_internal_fn[classBars] = function (d) {
        return this[classShapes](d) + this[generateClass](CLASS[bars], d.id);
    };
    var classArc = 'classArc';
    c3_chart_internal_fn[classArc] = function (d) {
        return this[classShape](d.data) + this[generateClass](CLASS[arc], d.data.id);
    };
    var classArcs = 'classArcs';
    c3_chart_internal_fn[classArcs] = function (d) {
        return this[classShapes](d.data) + this[generateClass](CLASS[arcs], d.data.id);
    };
    var classArea = 'classArea';
    c3_chart_internal_fn[classArea] = function (d) {
        return this[classShape](d) + this[generateClass](CLASS[area], d.id);
    };
    var classAreas = 'classAreas';
    c3_chart_internal_fn[classAreas] = function (d) {
        return this[classShapes](d) + this[generateClass](CLASS[areas], d.id);
    };
    var classRegion = 'classRegion';
    c3_chart_internal_fn[classRegion] = function (d, i) {
        return this[generateClass](CLASS[region], i) + ' ' + (CSS_CLASS in d ? d.class : '');
    };
    var classEvent = 'classEvent';
    c3_chart_internal_fn[classEvent] = function (d) {
        return this[generateClass](CLASS[eventRect], d.index);
    };
    var classTarget = 'classTarget';
    c3_chart_internal_fn[classTarget] = function (id) {
        var $$ = this;
        var additionalClassSuffix = $$.config[__data_classes][id], additionalClass = '';
        if (additionalClassSuffix) {
            additionalClass = ' ' + CLASS[target] + '-' + additionalClassSuffix;
        }
        return $$[generateClass](CLASS[target], id) + additionalClass;
    };
    var classChartText = 'classChartText';
    c3_chart_internal_fn[classChartText] = function (d) {
        return CLASS[chartText] + this[classTarget](d.id);
    };
    var classChartLine = 'classChartLine';
    c3_chart_internal_fn[classChartLine] = function (d) {
        return CLASS[chartLine] + this[classTarget](d.id);
    };
    var classChartBar = 'classChartBar';
    c3_chart_internal_fn[classChartBar] = function (d) {
        return CLASS[chartBar] + this[classTarget](d.id);
    };
    var classChartArc = 'classChartArc';
    c3_chart_internal_fn[classChartArc] = function (d) {
        return CLASS[chartArc] + this[classTarget](d.data.id);
    };
    var getTargetSelectorSuffix = 'getTargetSelectorSuffix';
    c3_chart_internal_fn[getTargetSelectorSuffix] = function (targetId) {
        return targetId || targetId === 0 ? '-' + (targetId.replace ? targetId.replace(/([^a-zA-Z0-9-_])/g, '-') : targetId) : '';
    };
    var selectorTarget = 'selectorTarget';
    c3_chart_internal_fn[selectorTarget] = function (id) {
        return '.' + CLASS[target] + this[getTargetSelectorSuffix](id);
    };
    var selectorTargets = 'selectorTargets';
    c3_chart_internal_fn[selectorTargets] = function (ids) {
        var $$ = this;
        return ids.length ? ids.map(function (id) { return $$[selectorTarget](id); }) : null;
    };
    var selectorLegend = 'selectorLegend';
    c3_chart_internal_fn[selectorLegend] = function (id) {
        return '.' + CLASS[legendItem] + this[getTargetSelectorSuffix](id);
    };
    var selectorLegends = 'selectorLegends';
    c3_chart_internal_fn[selectorLegends] = function (ids) {
        var $$ = this;
        return ids.length ? ids.map(function (id) { return $$[selectorLegend](id); }) : null;
    };



    /**
     *  c3.format.js
     */
    var getYFormat = 'getYFormat';
    c3_chart_internal_fn[getYFormat] = function (forArc) {
        var $$ = this,
            formatForY = forArc && !$$[hasType]($$.data.targets, TYPE_GAUGE) ? $$.defaultArcValueFormat : $$.yFormat,
            formatForY2 = forArc && !$$[hasType]($$.data.targets, TYPE_GAUGE) ? $$.defaultArcValueFormat : $$.y2Format;
        return function (v, ratio, id) {
            var format = $$[getAxisId](id) === 'y2' ? formatForY2 : formatForY;
            return format.call($$, v, ratio);
        };
    };
    var yFormat = 'yFormat';
    c3_chart_internal_fn[yFormat] = function (v) {
        var $$ = this, config = $$.config,
            format = config[__axis_y_tick_format] ? config[__axis_y_tick_format] : $$.defaultValueFormat;
        return format(v);
    };
    var y2Format = 'y2Format';
    c3_chart_internal_fn[y2Format] = function (v) {
        var $$ = this, config = $$.config,
            format = config[__axis_y2_tick_format] ? config[__axis_y2_tick_format] : $$.defaultValueFormat;
        return format(v);
    };
    var defaultValueFormat = 'defaultValueFormat';
    c3_chart_internal_fn[defaultValueFormat] = function (v) {
        return isValue(v) ? +v : "";
    };
    var defaultArcValueFormat = 'defaultArcValueFormat';
    c3_chart_internal_fn[defaultArcValueFormat] = function (v, ratio) {
        return (ratio * 100).toFixed(1) + '%';
    };
    var formatByAxisId = 'formatByAxisId';
    c3_chart_internal_fn[formatByAxisId] = function (axisId) {
        var $$ = this.internal, data_labels = $$.config[__data_labels],
            format = function (v) { return isValue(v) ? +v : ""; };
        // find format according to axis id
        if (isFunction(data_labels.format)) {
            format = data_labels.format;
        } else if (typeof data_labels.format === 'object') {
            if (isFunction(data_labels.format[axisId])) {
                format = data_labels.format[axisId];
            }
        }
        return format;
    };



    /**
     *  c3.drag.js
     */
    var drag = 'drag';
    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 ($$[hasArcType]($$.data.targets)) { return; }
        if (! config[__data_selection_enabled]) { return; } // do nothing if not selectable
        if (config[__zoom_enabled] && ! $$.zoom.altDomain) { return; } // skip if zoomable because of conflict drag dehavior
        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 = $$.togglePoint;
                    isWithin = minX < _x && _x < maxX && minY < _y && _y < maxY;
                }
                else if (shape.classed(CLASS[bar])) {
                    box = getPathBox(this);
                    _x = box.x;
                    _y = box.y;
                    _w = box.width;
                    _h = box.height;
                    toggle = $$.toggleBar;
                    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](!isSelected, shape, d, i);
                }
            });
    };

    var dragstart = 'dragstart';
    c3_chart_internal_fn[dragstart] = function (mouse) {
        var $$ = this, config = $$.config;
        if ($$[hasArcType]($$.data.targets)) { return; }
        if (! config[__data_selection_enabled]) { return; } // do nothing if not selectable
        $$[dragStart] = mouse;
        $$.main.select('.' + CLASS[chart]).append('rect')
            .attr(CSS_CLASS, CLASS[dragarea])
            .style(CSS_OPACITY, 0.1);
        $$[dragging] = true;
        $$.config[__data_ondragstart]();
    };

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





    /**
     *  c3.api.js (or c3.api.focus.js, etc?)
     */
    c3_chart_fn.focus = function (targetId) {
        var $$ = this.internal,
            candidates = $$.svg.selectAll($$[selectorTarget](targetId)),
            candidatesForNoneArc = candidates.filter(generateCall($$[isNoneArc], $$)),
            candidatesForArc = candidates.filter(generateCall($$[isArc], $$));
        function focus(targets) {
            $$[filterTargetsToShow](targets).transition().duration(100).style(CSS_OPACITY, 1);
        }
        this.revert();
        this.defocus();
        focus(candidatesForNoneArc.classed(CLASS[focused], true));
        focus(candidatesForArc);
        if ($$[hasArcType]($$.data.targets)) {
            $$[expandArc](targetId, true);
        }
        $$[toggleFocusLegend](targetId, true);
    };

    c3_chart_fn.defocus = function (targetId) {
        var $$ = this.internal,
            candidates = $$.svg.selectAll($$[selectorTarget](targetId)),
            candidatesForNoneArc = candidates.filter(generateCall($$[isNoneArc], $$)),
            candidatesForArc = candidates.filter(generateCall($$[isArc], $$));
        function defocus(targets) {
            $$[filterTargetsToShow](targets).transition().duration(100).style(CSS_OPACITY, 0.3);
        }
        this.revert();
        defocus(candidatesForNoneArc.classed(CLASS[focused], false));
        defocus(candidatesForArc);
        if ($$[hasArcType]($$.data.targets)) {
            $$[unexpandArc](targetId);
        }
        $$[toggleFocusLegend](targetId, false);
    };

    c3_chart_fn.revert = function (targetId) {
        var $$ = this.internal,
            candidates = $$.svg.selectAll($$[selectorTarget](targetId)),
            candidatesForNoneArc = candidates.filter(generateCall($$[isNoneArc], $$)),
            candidatesForArc = candidates.filter(generateCall($$[isArc], $$));
        function revert(targets) {
            $$[filterTargetsToShow](targets).transition().duration(100).style(CSS_OPACITY, 1);
        }
        revert(candidatesForNoneArc.classed(CLASS[focused], false));
        revert(candidatesForArc);
        if ($$[hasArcType]($$.data.targets)) {
            $$[unexpandArc](targetId);
        }
        $$[revertLegend]();
    };

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

        targetIds = $$[mapToTargetIds](targetIds);
        options = options || {};

        $$[removeHiddenTargetIds](targetIds);
        $$.svg.selectAll($$[selectorTargets](targetIds))
          .transition()
            .style(CSS_OPACITY, 1);

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

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

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

        targetIds = $$[mapToTargetIds](targetIds);
        options = options || {};

        $$[addHiddenTargetIds](targetIds);
        $$.svg.selectAll($$[selectorTargets](targetIds))
          .transition()
            .style(CSS_OPACITY, 0);

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

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

    c3_chart_fn.toggle = function (targetId) {
        var $$ = this.internal;
        $$[isTargetToShow](targetId) ? this.hide(targetId) : this.show(targetId);
    };

    c3_chart_fn.zoom = function () {
    };
    c3_chart_fn.zoom.enable = function (enabled) {
        var $$ = this.internal;
        $$.config[__zoom_enabled] = enabled;
        $$[updateAndRedraw]();
    };
    c3_chart_fn.unzoom = function () {
        var $$ = this.internal;
        $$.brush.clear().update();
        $$[redraw]({withUpdateXDomain: true});
    };

    c3_chart_fn.load = function (args) {
        var $$ = this.internal, config = $$.config;
        // update xs if specified
        if (args.xs) {
            $$[addXs](args.xs);
        }
        // update classes if exists
        if ('classes' in args) {
            Object.keys(args.classes).forEach(function (id) {
                config[__data_classes][id] = args.classes[id];
            });
        }
        // update categories if exists
        if ('categories' in args && $$[isCategorized]) {
            config[__axis_x_categories] = args.categories;
        }
        // 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 $$ = this.internal;
        args = args || {};
        $$[unload]($$[mapToTargetIds](args.ids), function () {
            $$[redraw]({withUpdateOrgXDomain: true, withUpdateXDomain: true, withLegend: true});
            if (isFunction(args.done)) { args.done(); }
        });
    };

    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, 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, 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
        });
    };

    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 = $$[getToggle](this),
                isTargetId = config[__data_selection_grouped] || !ids || ids.indexOf(id) >= 0,
                isTargetIndex = !indices || indices.indexOf(i) >= 0,
                isSelected = shape.classed(CLASS[SELECTED]);
            // line/area selection not supported yet
            if (shape.classed(CLASS[line]) || shape.classed(CLASS[area])) {
                return;
            }
            if (isTargetId && isTargetIndex) {
                if (config[__data_selection_isselectable](d) && !isSelected) {
                    toggle(true, shape.classed(CLASS[SELECTED], true), d, i);
                }
            } else if (isDefined(resetOther) && resetOther) {
                if (isSelected) {
                    toggle(false, shape.classed(CLASS[SELECTED], false), d, i);
                }
            }
        });
    };
    c3_chart_fn.unselect = function (ids, indices) {
        var $$ = 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),
                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.transform = function (type, targetIds) {
        var $$ = this.internal,
            options = ['pie', 'donut'].indexOf(type) >= 0 ? {withTransform: true} : null;
        $$[transformTo](targetIds, type, options);
    };

    c3_chart_fn.groups = function (groups) {
        var $$ = this.internal, config = $$.config;
        if (!isDefined(groups)) { return config[__data_groups]; }
        config[__data_groups] = groups;
        $$[redraw]();
        return config[__data_groups];
    };

    c3_chart_fn.xgrids = function (grids) {
        var $$ = this.internal, config = $$.config;
        if (! grids) { return config[__grid_x_lines]; }
        config[__grid_x_lines] = grids;
        $$[redraw]();
        return config[__grid_x_lines];
    };
    c3_chart_fn.xgrids.add = function (grids) {
        var $$ = 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;
        $$[redraw]();
        return config[__grid_y_lines];
    };
    c3_chart_fn.ygrids.add = function (grids) {
        var $$ = this.internal;
        return c3.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.regions = function (regions) {
        var $$ = this.internal, config = $$.config;
        if (!regions) { return config[__regions]; }
        config[__regions] = regions;
        $$[redraw]();
        return config[__regions];
    };
    c3_chart_fn.regions.add = function (regions) {
        var $$ = this.internal, config = $$.config;
        if (!regions) { return config[__regions]; }
        config[__regions] = config[__regions].concat(regions);
        $$[redraw]();
        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(CSS_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.data = function () {
    };
    c3_chart_fn.data.get = function (targetId) {
        var target = this.data.getAsTarget(targetId);
        return isDefined(target) ? target.values.map(function (d) { return d.value; }) : undefined;
    };
    c3_chart_fn.data.getAsTarget = function (targetId) {
        var targets = this.data.targets.filter(function (t) { return t.id === targetId; });
        return targets.length > 0 ? targets[0] : undefined;
    };
    c3_chart_fn.data.names = function (names) {
        var $$ = this.internal, config = $$.config;
        if (!arguments.length) { return config[__data_names]; }
        Object.keys(names).forEach(function (id) {
            config[__data_names][id] = names[id];
        });
        $$[redraw]({withLegend: true});
        return config[__data_names];
    };
    c3_chart_fn.data.colors = function (colors) {
        var $$ = this.internal, config = $$.config;
        if (!arguments.length) { return config[__data_colors]; }
        Object.keys(colors).forEach(function (id) {
            config[__data_colors][id] = colors[id];
        });
        $$[redraw]({withLegend: true});
        return config[__data_colors];
    };
    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];
    };

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

    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.axis = function () {
    };
    c3_chart_fn.axis.labels = function (labels) {
        var $$ = this.internal;
        if (arguments.length) {
            Object.keys(labels).forEach(function (axisId) {
                $$[setAxisLabelText](axisId, labels[axisId]);
            });
            $$[updateAxisLabels]();
        }
        // TODO: return some values?
    };
    c3_chart_fn.axis.max = function (max) {
        var $$ = this.internal, config = $$.config;
        if (arguments.length) {
            if (typeof max === 'object') {
                if (isValue(max.x)) { config[__axis_x_max] = max.x; }
                if (isValue(max.y)) { config[__axis_y_max] = max.y; }
                if (isValue(max.y2)) { config[__axis_y2_max] = max.y2; }
            } else {
                config[__axis_y_max] = config[__axis_y2_max] = max;
            }
            $$[redraw]({withUpdateOrgXDomain: true, withUpdateXDomain: true});
        }
    };
    c3_chart_fn.axis.min = function (min) {
        var $$ = this.internal, config = $$.config;
        if (arguments.length) {
            if (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});
        }
    };
    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); }
        }
    };


    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.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 $$ = this.internal;
        $$.data.targets = undefined;
        $$.data.xs = {};
        $$.selectChart.classed('c3', false).html("");
        window.onresize = null;
    };



    /**
     *  c3.axis.js
     */
    // Features:
    // 1. category axis
    // 2. ceil values of translate/x/y to int for half pixel antialiasing
    function c3_axis(d3, isCategory) {
        var scale = d3.scale.linear(), orient = "bottom", innerTickSize = 6, outerTickSize = 6, tickPadding = 3, tickValues = null, tickFormat, tickArguments;

        var tickOffset = 0, tickCulling = true, tickCentered;

        function axisX(selection, x) {
            selection.attr(CSS_TRANSFORM, function (d) {
                return "translate(" + Math.ceil(x(d) + tickOffset) + ", 0)";
            });
        }
        function axisY(selection, y) {
            selection.attr(CSS_TRANSFORM, function (d) {
                return "translate(0," + Math.ceil(y(d)) + ")";
            });
        }
        function scaleExtent(domain) {
            var start = domain[0], stop = domain[domain.length - 1];
            return start < stop ? [ start, stop ] : [ stop, start ];
        }
        function generateTicks(scale) {
            var i, domain, ticks = [];
            if (scale.ticks) {
                return scale.ticks.apply(scale, 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;
        }
        function copyScale() {
            var newScale = scale.copy(), domain;
            if (isCategory) {
                domain = scale.domain();
                newScale.domain([domain[0], domain[1] - 1]);
            }
            return newScale;
        }
        function textFormatted(v) {
            return tickFormat ? tickFormat(v) : v;
        }
        function axis(g) {
            g.each(function () {
                var g = d3.select(this);
                var scale0 = this.__chart__ || scale, scale1 = this.__chart__ = copyScale();

                var ticks = tickValues ? tickValues : generateTicks(scale1),
                    tick = g.selectAll(".tick").data(ticks, scale1),
                    tickEnter = tick.enter().insert("g", ".domain").attr(CSS_CLASS, "tick").style(CSS_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 = tick.exit().remove(),
                    tickUpdate = d3.transition(tick).style(CSS_OPACITY, 1),
                    tickTransform, tickX;

                var range = scale.rangeExtent ? scale.rangeExtent() : scaleExtent(scale.range()),
                    path = g.selectAll(".domain").data([ 0 ]),
                    pathUpdate = (path.enter().append("path").attr(CSS_CLASS, "domain"), d3.transition(path));
                tickEnter.append("line");
                tickEnter.append("text");

                var lineEnter = tickEnter.select("line"),
                    lineUpdate = tickUpdate.select("line"),
                    text = tick.select("text").text(textFormatted),
                    textEnter = tickEnter.select("text"),
                    textUpdate = tickUpdate.select("text");

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

                function tickSize(d) {
                    var tickPosition = scale(d) + tickOffset;
                    return range[0] < tickPosition && tickPosition < range[1] ? innerTickSize : 0;
                }

                switch (orient) {
                case "bottom":
                    {
                        tickTransform = axisX;
                        lineEnter.attr("y2", innerTickSize);
                        textEnter.attr("y", Math.max(innerTickSize, 0) + tickPadding);
                        lineUpdate.attr("x1", tickX).attr("x2", tickX).attr("y2", tickSize);
                        textUpdate.attr("x", 0).attr("y", Math.max(innerTickSize, 0) + tickPadding);
                        text.attr("dy", ".71em").style(CSS_TEXT_ANCHOR, "middle");
                        pathUpdate.attr("d", "M" + range[0] + "," + outerTickSize + "V0H" + range[1] + "V" + outerTickSize);
                        break;
                    }
                case "top":
                    {
                        tickTransform = axisX;
                        lineEnter.attr("y2", -innerTickSize);
                        textEnter.attr("y", -(Math.max(innerTickSize, 0) + tickPadding));
                        lineUpdate.attr("x2", 0).attr("y2", -innerTickSize);
                        textUpdate.attr("x", 0).attr("y", -(Math.max(innerTickSize, 0) + tickPadding));
                        text.attr("dy", "0em").style(CSS_TEXT_ANCHOR, "middle");
                        pathUpdate.attr("d", "M" + range[0] + "," + -outerTickSize + "V0H" + range[1] + "V" + -outerTickSize);
                        break;
                    }
                case "left":
                    {
                        tickTransform = axisY;
                        lineEnter.attr("x2", -innerTickSize);
                        textEnter.attr("x", -(Math.max(innerTickSize, 0) + tickPadding));
                        lineUpdate.attr("x2", -innerTickSize).attr("y2", 0);
                        textUpdate.attr("x", -(Math.max(innerTickSize, 0) + tickPadding)).attr("y", tickOffset);
                        text.attr("dy", ".32em").style(CSS_TEXT_ANCHOR, "end");
                        pathUpdate.attr("d", "M" + -outerTickSize + "," + range[0] + "H0V" + range[1] + "H" + -outerTickSize);
                        break;
                    }
                case "right":
                    {
                        tickTransform = axisY;
                        lineEnter.attr("x2", innerTickSize);
                        textEnter.attr("x", Math.max(innerTickSize, 0) + tickPadding);
                        lineUpdate.attr("x2", innerTickSize).attr("y2", 0);
                        textUpdate.attr("x", Math.max(innerTickSize, 0) + tickPadding).attr("y", 0);
                        text.attr("dy", ".32em").style(CSS_TEXT_ANCHOR, "start");
                        pathUpdate.attr("d", "M" + outerTickSize + "," + range[0] + "H0V" + range[1] + "H" + outerTickSize);
                        break;
                    }
                }
                if (scale1.rangeBand) {
                    var x = scale1, dx = x.rangeBand() / 2;
                    scale0 = scale1 = function (d) {
                        return x(d) + dx;
                    };
                } else if (scale0.rangeBand) {
                    scale0 = scale1;
                } else {
                    tickExit.call(tickTransform, scale1);
                }
                tickEnter.call(tickTransform, scale0);
                tickUpdate.call(tickTransform, scale1);
            });
        }
        axis.scale = function (x) {
            if (!arguments.length) { return scale; }
            scale = x;
            return axis;
        };
        axis.orient = function (x) {
            if (!arguments.length) { return orient; }
            orient = x in {top: 1, right: 1, bottom: 1, left: 1} ? x + "" : "bottom";
            return axis;
        };
        axis.tickFormat = function (format) {
            if (!arguments.length) { return tickFormat; }
            tickFormat = format;
            return axis;
        };
        axis.tickCentered = function (isCentered) {
            if (!arguments.length) { return tickCentered; }
            tickCentered = isCentered;
            return axis;
        };
        axis.tickOffset = function () { // This will be overwritten when normal x axis
            return tickOffset;
        };
        axis.ticks = function () {
            if (!arguments.length) { return tickArguments; }
            tickArguments = arguments;
            return axis;
        };
        axis.tickCulling = function (culling) {
            if (!arguments.length) { return tickCulling; }
            tickCulling = culling;
            return axis;
        };
        axis.tickValues = function (x) {
            if (!arguments.length) { return tickValues; }
            tickValues = x;
            return axis;
        };
        return axis;
    }

    if (typeof define === 'function' && define.amd) {
        define("c3", ["d3"], c3);
    } else if ('undefined' !== typeof exports && 'undefined' !== typeof module) {
        module.exports = c3;
    } else {
        window.c3 = c3;
    }

})(window);