From a3a16800fbfa737f1dc003e05c510dfe1e6d8803 Mon Sep 17 00:00:00 2001
From: Masayuki Tanaka <masayuki0812@mac.com>
Date: Tue, 19 Aug 2014 17:40:05 +0900
Subject: [PATCH] Fix literal for config

---
 c3.js                | 1431 +++++++++++++++++++-----------------------
 c3.min.js            |    8 +-
 src/api.axis.js      |   16 +-
 src/api.category.js  |   10 +-
 src/api.chart.js     |    4 +-
 src/api.data.js      |   12 +-
 src/api.flow.js      |    8 +-
 src/api.grid.js      |   16 +-
 src/api.group.js     |    6 +-
 src/api.load.js      |    4 +-
 src/api.region.js    |   18 +-
 src/api.selection.js |   12 +-
 src/api.zoom.js      |    2 +-
 src/arc.js           |   36 +-
 src/axis.js          |   80 +--
 src/category.js      |    2 +-
 src/class.js         |    2 +-
 src/clip.js          |   18 +-
 src/color.js         |   12 +-
 src/config.js        |  499 +++++----------
 src/core.js          |  132 ++--
 src/data.convert.js  |   16 +-
 src/data.js          |   28 +-
 src/domain.js        |   58 +-
 src/drag.js          |   20 +-
 src/format.js        |    6 +-
 src/grid.js          |   78 +--
 src/interaction.js   |   44 +-
 src/legend.js        |   38 +-
 src/region.js        |   18 +-
 src/scale.js         |   20 +-
 src/selection.js     |   22 +-
 src/shape.bar.js     |   12 +-
 src/shape.js         |   10 +-
 src/shape.line.js    |   44 +-
 src/size.js          |   38 +-
 src/subchart.js      |   18 +-
 src/text.js          |    6 +-
 src/tooltip.js       |   30 +-
 src/type.js          |   26 +-
 src/zoom.js          |   10 +-
 41 files changed, 1282 insertions(+), 1588 deletions(-)

diff --git a/c3.js b/c3.js
index 7b5a1a3..87c29d5 100644
--- a/c3.js
+++ b/c3.js
@@ -52,17 +52,17 @@
 
         $$.initParams();
 
-        if (config[__data_url]) {
-            $$.convertUrlToData(config[__data_url], config[__data_mimeType], config[__data_keys], $$.initWithData);
+        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_json) {
+            $$.initWithData($$.convertJsonToData(config.data_json, config.data_keys));
         }
-        else if (config[__data_rows]) {
-            $$.initWithData($$.convertRowsToData(config[__data_rows]));
+        else if (config.data_rows) {
+            $$.initWithData($$.convertRowsToData(config.data_rows));
         }
-        else if (config[__data_columns]) {
-            $$.initWithData($$.convertColumnsToData(config[__data_columns]));
+        else if (config.data_columns) {
+            $$.initWithData($$.convertColumnsToData(config.data_columns));
         }
         else {
             throw Error('url or json or rows or columns is required.');
@@ -89,8 +89,8 @@
         $$.color = $$.generateColor();
         $$.levelColor = $$.generateLevelColor();
 
-        $$.dataTimeFormat = config[__data_xLocaltime] ? d3.time.format : d3.time.format.utc;
-        $$.axisTimeFormat = config[__axis_x_localtime] ? d3.time.format : d3.time.format.utc;
+        $$.dataTimeFormat = config.data_xLocaltime ? d3.time.format : d3.time.format.utc;
+        $$.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(); }],
@@ -105,15 +105,15 @@
         $$.hiddenTargetIds = [];
         $$.hiddenLegendIds = [];
 
-        $$.xOrient = config[__axis_rotated] ? "left" : "bottom";
-        $$.yOrient = config[__axis_rotated] ? "bottom" : "left";
-        $$.y2Orient = config[__axis_rotated] ? "top" : "right";
-        $$.subXOrient = config[__axis_rotated] ? "left" : "bottom";
+        $$.xOrient = config.axis_rotated ? "left" : "bottom";
+        $$.yOrient = config.axis_rotated ? "bottom" : "left";
+        $$.y2Orient = config.axis_rotated ? "top" : "right";
+        $$.subXOrient = config.axis_rotated ? "left" : "bottom";
 
-        $$.isLegendRight = config[__legend_position] === 'right';
-        $$.isLegendInset = config[__legend_position] === 'inset';
-        $$.isLegendTop = config[__legend_inset_anchor] === 'top-left' || config[__legend_inset_anchor] === 'top-right';
-        $$.isLegendLeft = config[__legend_inset_anchor] === 'top-left' || config[__legend_inset_anchor] === 'bottom-left';
+        $$.isLegendRight = config.legend_position === 'right';
+        $$.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;
         $$.legendItemHeight = 0;
@@ -122,7 +122,7 @@
         $$.currentMaxTickWidth = 0;
 
         $$.rotated_padding_left = 30;
-        $$.rotated_padding_right = config[__axis_rotated] && !config[__axis_x_show] ? 0 : 30;
+        $$.rotated_padding_right = config.axis_rotated && !config.axis_x_show ? 0 : 30;
         $$.rotated_padding_top = 5;
 
         $$.withoutFadeIn = {};
@@ -138,7 +138,7 @@
         if ($$.initBrush) { $$.initBrush(); }
         if ($$.initZoom) { $$.initZoom(); }
 
-        $$.selectChart = d3.select(config[__bindto]);
+        $$.selectChart = d3.select(config.bindto);
         if ($$.selectChart.empty()) {
             $$.selectChart = d3.select(document.createElement('div')).style('opacity', 0);
             $$.observeInserted($$.selectChart);
@@ -150,18 +150,18 @@
         $$.data.xs = {};
         $$.data.targets = $$.convertDataToTargets(data);
 
-        if (config[__data_filter]) {
-            $$.data.targets = $$.data.targets.filter(config[__data_filter]);
+        if (config.data_filter) {
+            $$.data.targets = $$.data.targets.filter(config.data_filter);
         }
 
         // Set targets to hide if needed
-        if (config[__data_hide]) {
-            $$.addHiddenTargetIds(config[__data_hide] === true ? $$.mapToIds($$.data.targets) : config[__data_hide]);
+        if (config.data_hide) {
+            $$.addHiddenTargetIds(config.data_hide === true ? $$.mapToIds($$.data.targets) : config.data_hide);
         }
 
         // when gauge, hide legend // TODO: fix
         if ($$.hasType('gauge')) {
-            config[__legend_show] = false;
+            config.legend_show = false;
         }
 
         // Init sizes and scales
@@ -181,15 +181,15 @@
 
         // Set initialized scales to brush and zoom
         if ($$.brush) { $$.brush.scale($$.subX); }
-        if (config[__zoom_enabled]) { $$.zoom.scale($$.x); }
+        if (config.zoom_enabled) { $$.zoom.scale($$.x); }
 
         /*-- Basic Elements --*/
 
         // Define svgs
         $$.svg = $$.selectChart.append("svg")
             .style("overflow", "hidden")
-            .on('mouseenter', function () { return config[__onmouseover].call($$); })
-            .on('mouseleave', function () { return config[__onmouseout].call($$); });
+            .on('mouseenter', function () { return config.onmouseover.call($$); })
+            .on('mouseleave', function () { return config.onmouseout.call($$); });
 
         // Define defs
         $$.defs = $$.svg.append("defs");
@@ -242,7 +242,7 @@
 
         // if zoom privileged, insert rect to forefront
         // TODO: is this needed?
-        main.insert('rect', config[__zoom_privileged] ? null : 'g.' + CLASS[_regions])
+        main.insert('rect', config.zoom_privileged ? null : 'g.' + CLASS[_regions])
             .attr('class', CLASS[_zoomRect])
             .attr('width', $$.width)
             .attr('height', $$.height)
@@ -250,8 +250,8 @@
             .on("dblclick.zoom", null);
 
         // Set default extent if defined
-        if (config[__axis_x_default]) {
-            $$.brush.extent(isFunction(config[__axis_x_default]) ? config[__axis_x_default]($$.getXDomain()) : config[__axis_x_default]);
+        if (config.axis_x_default) {
+            $$.brush.extent(isFunction(config.axis_x_default) ? config.axis_x_default($$.getXDomain()) : config.axis_x_default);
         }
 
         // Add Axis
@@ -277,13 +277,13 @@
         }
         if (window.onresize.add) {
             window.onresize.add(function () {
-                config[__onresize].call($$);
+                config.onresize.call($$);
             });
             window.onresize.add(function () {
                 $$.api.flush();
             });
             window.onresize.add(function () {
-                config[__onresized].call($$);
+                config.onresized.call($$);
             });
         }
 
@@ -317,14 +317,14 @@
             legendWidth = $$.legend ? $$.getLegendWidth() : 0,
             legendHeightForBottom = $$.isLegendRight || $$.isLegendInset ? 0 : legendHeight,
             hasArc = $$.hasArcType(),
-            xAxisHeight = config[__axis_rotated] || hasArc ? 0 : $$.getHorizontalAxisHeight('x'),
-            subchartHeight = config[__subchart_show] && !hasArc ? (config[__subchart_size_height] + xAxisHeight) : 0;
+            xAxisHeight = config.axis_rotated || hasArc ? 0 : $$.getHorizontalAxisHeight('x'),
+            subchartHeight = config.subchart_show && !hasArc ? (config.subchart_size_height + xAxisHeight) : 0;
 
         $$.currentWidth = $$.getCurrentWidth();
         $$.currentHeight = $$.getCurrentHeight();
 
         // for main
-        $$.margin = config[__axis_rotated] ? {
+        $$.margin = config.axis_rotated ? {
             top: $$.getHorizontalAxisHeight('y2') + $$.getCurrentPaddingTop(),
             right: hasArc ? 0 : $$.getCurrentPaddingRight(),
             bottom: $$.getHorizontalAxisHeight('y') + legendHeightForBottom + $$.getCurrentPaddingBottom(),
@@ -337,7 +337,7 @@
         };
 
         // for subchart
-        $$.margin2 = config[__axis_rotated] ? {
+        $$.margin2 = config.axis_rotated ? {
             top: $$.margin.top,
             right: NaN,
             bottom: 20 + legendHeightForBottom,
@@ -363,8 +363,8 @@
         if ($$.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;
+        $$.width2 = config.axis_rotated ? $$.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; }
 
@@ -400,7 +400,7 @@
 
         // Fade-in each chart
         $$.svg.selectAll('.' + CLASS[_target]).filter(function (d) { return $$.isTargetToShow(d.id); })
-          .transition().duration(config[__transition_duration])
+          .transition().duration(config.transition_duration)
             .style("opacity", 1);
     };
 
@@ -414,8 +414,8 @@
         var waitForDraw, flow;
         var targetsToShow = $$.filterTargetsToShow($$.data.targets), tickValues, i, intervalForCulling;
         var xv = $$.xv.bind($$),
-            cx = ($$.config[__axis_rotated] ? $$.circleY : $$.circleX).bind($$),
-            cy = ($$.config[__axis_rotated] ? $$.circleX : $$.circleY).bind($$);
+            cx = ($$.config.axis_rotated ? $$.circleY : $$.circleX).bind($$),
+            cy = ($$.config.axis_rotated ? $$.circleX : $$.circleY).bind($$);
 
         options = options || {};
         withY = getOption(options, "withY", true);
@@ -428,14 +428,14 @@
         withTransitionForExit = getOption(options, "withTransitionForExit", withTransition);
         withTransitionForAxis = getOption(options, "withTransitionForAxis", withTransition);
 
-        duration = withTransition ? config[__transition_duration] : 0;
+        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]) {
+        if (withLegend && config.legend_show) {
             $$.updateLegend($$.mapToIds($$.data.targets), options, transitions);
         }
 
@@ -447,8 +447,8 @@
         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($$.mapTargetsToUniqueXs(targetsToShow), config[__axis_x_tick_count]);
+            if (!config.axis_x_tick_values && (config.axis_x_tick_fit || config.axis_x_tick_count)) {
+                tickValues = $$.generateTickValues($$.mapTargetsToUniqueXs(targetsToShow), config.axis_x_tick_count);
                 $$.xAxis.tickValues(tickValues);
                 $$.subXAxis.tickValues(tickValues);
             }
@@ -468,9 +468,9 @@
 
         // show/hide if manual culling needed
         if (withUpdateXDomain && targetsToShow.length) {
-            if (config[__axis_x_tick_culling] && tickValues) {
+            if (config.axis_x_tick_culling && tickValues) {
                 for (i = 1; i < tickValues.length; i++) {
-                    if (tickValues.length / i < config[__axis_x_tick_culling_max]) {
+                    if (tickValues.length / i < config.axis_x_tick_culling_max) {
                         intervalForCulling = i;
                         break;
                     }
@@ -487,8 +487,8 @@
         }
 
         // rotate tick text if needed
-        if (!config[__axis_rotated] && config[__axis_x_tick_rotate]) {
-            $$.rotateTickText($$.axes.x, transitions.axisX, config[__axis_x_tick_rotate]);
+        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
@@ -512,7 +512,7 @@
         main.select("text." + CLASS[_text] + '.' + CLASS[_empty])
             .attr("x", $$.width / 2)
             .attr("y", $$.height / 2)
-            .text(config[__data_empty_label_text])
+            .text(config.data_empty_label_text)
           .transition()
             .style('opacity', targetsToShow.length ? 0 : 1);
 
@@ -528,7 +528,7 @@
         // lines, areas and cricles
         $$.redrawLine(durationForExit);
         $$.redrawArea(durationForExit);
-        if (config[__point_show]) { $$.redrawCircle(); }
+        if (config.point_show) { $$.redrawCircle(); }
 
         // text
         if ($$.hasDataLabel()) {
@@ -550,7 +550,7 @@
             .remove();
 
         // event rect
-        if (config[__interaction_enabled]) {
+        if (config.interaction_enabled) {
             $$.redrawEventRect();
         }
 
@@ -612,8 +612,8 @@
         // 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);
+        if (!(options.withLegend && config.legend_show)) {
+            transitions = $$.generateAxisTransitions(options.withTransitionForAxis ? config.transition_duration : 0);
             // Update scales
             $$.updateScales();
             $$.updateSvgSize();
@@ -625,14 +625,14 @@
     };
 
     c3_chart_internal_fn.isTimeSeries = function () {
-        return this.config[__axis_x_type] === 'timeseries';
+        return this.config.axis_x_type === 'timeseries';
     };
     c3_chart_internal_fn.isCategorized = function () {
-        return this.config[__axis_x_type].indexOf('categor') >= 0;
+        return this.config.axis_x_type.indexOf('categor') >= 0;
     };
     c3_chart_internal_fn.isCustomX = function () {
         var $$ = this, config = $$.config;
-        return !$$.isTimeSeries() && (config[__data_x] || notEmpty(config[__data_xs]));
+        return !$$.isTimeSeries() && (config.data_x || notEmpty(config.data_xs));
     };
 
     c3_chart_internal_fn.getTranslate = function (target) {
@@ -648,16 +648,16 @@
             y = $$.margin3.top;
         } else if (target === 'x') {
             x = 0;
-            y = config[__axis_rotated] ? 0 : $$.height;
+            y = config.axis_rotated ? 0 : $$.height;
         } else if (target === 'y') {
             x = 0;
-            y = config[__axis_rotated] ? $$.height : 0;
+            y = config.axis_rotated ? $$.height : 0;
         } else if (target === 'y2') {
-            x = config[__axis_rotated] ? 0 : $$.width;
-            y = config[__axis_rotated] ? 1 : 0;
+            x = config.axis_rotated ? 0 : $$.width;
+            y = config.axis_rotated ? 1 : 0;
         } else if (target === 'subx') {
             x = 0;
-            y = config[__axis_rotated] ? 0 : $$.height2;
+            y = config.axis_rotated ? 0 : $$.height2;
         } else if (target === 'arc') {
             x = $$.arcWidth / 2;
             y = $$.arcHeight / 2;
@@ -720,7 +720,7 @@
     c3_chart_internal_fn.transformAll = function (withTransition, transitions) {
         var $$ = this;
         $$.transformMain(withTransition, transitions);
-        if ($$.config[__subchart_show]) { $$.transformContext(withTransition, transitions); }
+        if ($$.config.subchart_show) { $$.transformContext(withTransition, transitions); }
         if ($$.legend) { $$.transformLegend(withTransition); }
     };
 
@@ -750,7 +750,7 @@
 
     c3_chart_internal_fn.updateDimension = function () {
         var $$ = this;
-        if ($$.config[__axis_rotated]) {
+        if ($$.config.axis_rotated) {
             $$.axes.x.call($$.xAxis);
             $$.axes.subx.call($$.subXAxis);
         } else {
@@ -848,7 +848,7 @@
         } else if (typeof date === 'number') {
             parsedDate = new Date(date);
         } else {
-            parsedDate = $$.dataTimeFormat($$.config[__data_xFormat]).parse(date);
+            parsedDate = $$.dataTimeFormat($$.config.data_xFormat).parse(date);
         }
         if (!parsedDate || isNaN(+parsedDate)) {
             window.console.error("Failed to parse x '" + date + "' to Date object");
@@ -856,333 +856,180 @@
         return parsedDate;
     };
 
-    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_xFormat = 'data_xFormat',
-        __data_xLocaltime = 'data_xLocaltime',
-        __data_idConverter = 'data_idConverter',
-        __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_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_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';
-
     c3_chart_internal_fn.getDefaultConfig = function () {
-        var 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_xFormat] = '%Y-%m-%d';
-        config[__data_xLocaltime] = true;
-        config[__data_idConverter] = 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_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_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) {
-            return this.getTooltipContent ? this.getTooltipContent(d, defaultTitleFormat, defaultValueFormat, color) : '';
-        },
-        config[__tooltip_init_show] = false;
-        config[__tooltip_init_x] = 0;
-        config[__tooltip_init_position] = {top: '0px', left: '50px'};
+        var config = {
+            bindto: '#chart',
+            size_width: undefined,
+            size_height: undefined,
+            padding_left: undefined,
+            padding_right: undefined,
+            padding_top: undefined,
+            padding_bottom: undefined,
+            zoom_enabled: false,
+            zoom_extent: undefined,
+            zoom_privileged: false,
+            zoom_onzoom: function () {},
+            interaction_enabled: true,
+            onmouseover: function () {},
+            onmouseout: function () {},
+            onresize: function () {},
+            onresized: function () {},
+            transition_duration: 350,
+            data_x: undefined,
+            data_xs: {},
+            data_xFormat: '%Y-%m-%d',
+            data_xLocaltime: true,
+            data_idConverter: function (id) { return id; },
+            data_names: {},
+            data_classes: {},
+            data_groups: [],
+            data_axes: {},
+            data_type: undefined,
+            data_types: {},
+            data_labels: {},
+            data_order: 'desc',
+            data_regions: {},
+            data_color: undefined,
+            data_colors: {},
+            data_hide: false,
+            data_filter: undefined,
+            data_selection_enabled: false,
+            data_selection_grouped: false,
+            data_selection_isselectable: function () { return true; },
+            data_selection_multiple: true,
+            data_onclick: function () {},
+            data_onmouseover: function () {},
+            data_onmouseout: function () {},
+            data_onselected: function () {},
+            data_onunselected: function () {},
+            data_ondragstart: function () {},
+            data_ondragend: function () {},
+            data_url: undefined,
+            data_json: undefined,
+            data_rows: undefined,
+            data_columns: undefined,
+            data_mimeType: undefined,
+            data_keys: undefined,
+            // configuration for no plot-able data supplied.
+            data_empty_label_text: "",
+            // subchart
+            subchart_show: false,
+            subchart_size_height: 60,
+            subchart_onbrush: function () {},
+            // color
+            color_pattern: [],
+            color_threshold: {},
+            // legend
+            legend_show: true,
+            legend_position: 'bottom',
+            legend_inset_anchor: 'top-left',
+            legend_inset_x: 10,
+            legend_inset_y: 0,
+            legend_inset_step: undefined,
+            legend_item_onclick: undefined,
+            legend_item_onmouseover: undefined,
+            legend_item_onmouseout: undefined,
+            legend_equally: false,
+            // axis
+            axis_rotated: false,
+            axis_x_show: true,
+            axis_x_type: 'indexed',
+            axis_x_localtime: true,
+            axis_x_categories: [],
+            axis_x_tick_centered: false,
+            axis_x_tick_format: undefined,
+            axis_x_tick_culling: {},
+            axis_x_tick_culling_max: 10,
+            axis_x_tick_count: undefined,
+            axis_x_tick_fit: true,
+            axis_x_tick_values: null,
+            axis_x_tick_rotate: undefined,
+            axis_x_tick_outer: true,
+            axis_x_max: null,
+            axis_x_min: null,
+            axis_x_padding: {},
+            axis_x_height: undefined,
+            axis_x_default: undefined,
+            axis_x_label: {},
+            axis_y_show: true,
+            axis_y_max: undefined,
+            axis_y_min: undefined,
+            axis_y_center: undefined,
+            axis_y_label: {},
+            axis_y_tick_format: undefined,
+            axis_y_tick_outer: true,
+            axis_y_padding: undefined,
+            axis_y_ticks: 10,
+            axis_y2_show: false,
+            axis_y2_max: undefined,
+            axis_y2_min: undefined,
+            axis_y2_center: undefined,
+            axis_y2_label: {},
+            axis_y2_tick_format: undefined,
+            axis_y2_tick_outer: true,
+            axis_y2_padding: undefined,
+            axis_y2_ticks: 10,
+            // grid
+            grid_x_show: false,
+            grid_x_type: 'tick',
+            grid_x_lines: [],
+            grid_y_show: false,
+            // not used
+            // grid_y_type: 'tick',
+            grid_y_lines: [],
+            grid_y_ticks: 10,
+            grid_focus_show: true,
+            // point - point of each data
+            point_show: true,
+            point_r: 2.5,
+            point_focus_expand_enabled: true,
+            point_focus_expand_r: undefined,
+            point_select_r: undefined,
+            line_connect_null: false,
+            // bar
+            bar_width: undefined,
+            bar_width_ratio: 0.6,
+            bar_width_max: undefined,
+            bar_zerobased: true,
+            // area
+            area_zerobased: true,
+            // pie
+            pie_label_show: true,
+            pie_label_format: undefined,
+            pie_label_threshold: 0.05,
+            pie_sort: true,
+            pie_expand: true,
+            // gauge
+            gauge_label_show: true,
+            gauge_label_format: undefined,
+            gauge_expand: true,
+            gauge_min: 0,
+            gauge_max: 100,
+            gauge_units: undefined,
+            gauge_width: undefined,
+            // donut
+            donut_label_show: true,
+            donut_label_format: undefined,
+            donut_label_threshold: 0.05,
+            donut_width: undefined,
+            donut_sort: true,
+            donut_expand: true,
+            donut_title: "",
+            // region - region to change style
+            regions: [],
+            // tooltip - show when mouseover on each data
+            tooltip_show: true,
+            tooltip_grouped: true,
+            tooltip_format_title: undefined,
+            tooltip_format_name: undefined,
+            tooltip_format_value: undefined,
+            tooltip_contents: function (d, defaultTitleFormat, defaultValueFormat, color) {
+                return this.getTooltipContent ? this.getTooltipContent(d, defaultTitleFormat, defaultValueFormat, color) : '';
+            },
+            tooltip_init_show: false,
+            tooltip_init_x: 0,
+            tooltip_init_position: {top: '0px', left: '50px'}
+        };
 
         Object.keys(this.additionalConfig).forEach(function (key) {
             config[key] = this.additionalConfig[key];
@@ -1274,14 +1121,14 @@
         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] ? $$.width : 1;
+        $$.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] ? $$.width2 : 1;
+        $$.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());
@@ -1291,15 +1138,15 @@
         $$.subY2 = $$.getY($$.subYMin, $$.subYMax, forInit ? undefined : $$.subY2.domain());
         // update axes
         $$.xAxisTickFormat = $$.getXAxisTickFormat();
-        $$.xAxisTickValues = config[__axis_x_tick_values] ? config[__axis_x_tick_values] : (forInit ? undefined : $$.xAxis.tickValues());
+        $$.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, $$.y2Orient, config[__axis_y2_tick_format], config[__axis_y2_ticks]);
+        $$.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); }
+            if (config.zoom_enabled) { $$.zoom.scale($$.x); }
         }
         // update for arc
         if ($$.updateArc) { $$.updateArc(); }
@@ -1309,11 +1156,11 @@
         var $$ = this, config = $$.config,
             ids = $$.mapToIds(targets), ys = $$.getValuesAsIdKeyed(targets),
             j, k, baseId, idsInGroup, id, hasNegativeValue;
-        if (config[__data_groups].length > 0) {
+        if (config.data_groups.length > 0) {
             hasNegativeValue = $$.hasNegativeValueInTargets(targets);
-            for (j = 0; j < config[__data_groups].length; j++) {
+            for (j = 0; j < config.data_groups.length; j++) {
                 // Determine baseId
-                idsInGroup = config[__data_groups][j].filter(function (id) { return ids.indexOf(id) >= 0; });
+                idsInGroup = config.data_groups[j].filter(function (id) { return ids.indexOf(id) >= 0; });
                 if (idsInGroup.length === 0) { continue; }
                 baseId = idsInGroup[0];
                 // Consider negative values
@@ -1340,11 +1187,11 @@
         var $$ = this, config = $$.config,
             ids = $$.mapToIds(targets), ys = $$.getValuesAsIdKeyed(targets),
             j, k, baseId, idsInGroup, id, hasPositiveValue;
-        if (config[__data_groups].length > 0) {
+        if (config.data_groups.length > 0) {
             hasPositiveValue = $$.hasPositiveValueInTargets(targets);
-            for (j = 0; j < config[__data_groups].length; j++) {
+            for (j = 0; j < config.data_groups.length; j++) {
                 // Determine baseId
-                idsInGroup = config[__data_groups][j].filter(function (id) { return ids.indexOf(id) >= 0; });
+                idsInGroup = config.data_groups[j].filter(function (id) { return ids.indexOf(id) >= 0; });
                 if (idsInGroup.length === 0) { continue; }
                 baseId = idsInGroup[0];
                 // Consider positive values
@@ -1370,16 +1217,16 @@
     c3_chart_internal_fn.getYDomain = function (targets, axisId) {
         var $$ = this, config = $$.config,
             yTargets = targets.filter(function (d) { return $$.getAxisId(d.id) === axisId; }),
-            yMin = axisId === 'y2' ? config[__axis_y2_min] : config[__axis_y_min],
-            yMax = axisId === 'y2' ? config[__axis_y2_max] : config[__axis_y_max],
+            yMin = axisId === 'y2' ? config.axis_y2_min : config.axis_y_min,
+            yMax = axisId === 'y2' ? config.axis_y2_max : config.axis_y_max,
             yDomainMin = isValue(yMin) ? yMin : $$.getYDomainMin(yTargets),
             yDomainMax = isValue(yMax) ? yMax : $$.getYDomainMax(yTargets),
             domainLength, padding, padding_top, padding_bottom,
-            center = axisId === 'y2' ? config[__axis_y2_center] : config[__axis_y_center],
+            center = axisId === 'y2' ? config.axis_y2_center : config.axis_y_center,
             yDomainAbs, lengths, diff, ratio, isAllPositive, isAllNegative,
-            isZeroBased = ($$.hasType('bar', yTargets) && config[__bar_zerobased]) || ($$.hasType('area', yTargets) && config[__area_zerobased]),
-            showHorizontalDataLabel = $$.hasDataLabel() && config[__axis_rotated],
-            showVerticalDataLabel = $$.hasDataLabel() && !config[__axis_rotated];
+            isZeroBased = ($$.hasType('bar', yTargets) && config.bar_zerobased) || ($$.hasType('area', yTargets) && config.area_zerobased),
+            showHorizontalDataLabel = $$.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() : $$.y.domain();
         }
@@ -1415,13 +1262,13 @@
             padding_top += lengths[1];
             padding_bottom += lengths[0];
         }
-        if (axisId === 'y' && config[__axis_y_padding]) {
-            padding_top = $$.getAxisPadding(config[__axis_y_padding], 'top', padding, domainLength);
-            padding_bottom = $$.getAxisPadding(config[__axis_y_padding], 'bottom', padding, domainLength);
+        if (axisId === 'y' && config.axis_y_padding) {
+            padding_top = $$.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 = $$.getAxisPadding(config[__axis_y2_padding], 'bottom', padding, domainLength);
+        if (axisId === 'y2' && config.axis_y2_padding) {
+            padding_top = $$.getAxisPadding(config.axis_y2_padding, 'top', padding, domainLength);
+            padding_bottom = $$.getAxisPadding(config.axis_y2_padding, 'bottom', padding, domainLength);
         }
         // Bar/Area chart should be 0-based if all positive|negative
         if (isZeroBased) {
@@ -1432,14 +1279,14 @@
     };
     c3_chart_internal_fn.getXDomainMin = function (targets) {
         var $$ = this, config = $$.config;
-        return config[__axis_x_min] ?
-            ($$.isTimeSeries() ? this.parseDate(config[__axis_x_min]) : config[__axis_x_min]) :
+        return config.axis_x_min ?
+            ($$.isTimeSeries() ? this.parseDate(config.axis_x_min) : config.axis_x_min) :
         $$.d3.min(targets, function (t) { return $$.d3.min(t.values, function (v) { return v.x; }); });
     };
     c3_chart_internal_fn.getXDomainMax = function (targets) {
         var $$ = this, config = $$.config;
-        return config[__axis_x_max] ?
-            ($$.isTimeSeries() ? this.parseDate(config[__axis_x_max]) : config[__axis_x_max]) :
+        return config.axis_x_max ?
+            ($$.isTimeSeries() ? this.parseDate(config.axis_x_max) : config.axis_x_max) :
         $$.d3.max(targets, function (t) { return $$.d3.max(t.values, function (v) { return v.x; }); });
     };
     c3_chart_internal_fn.getXDomainPadding = function (targets) {
@@ -1454,11 +1301,11 @@
         } else {
             padding = diff * 0.01;
         }
-        if (typeof config[__axis_x_padding] === 'object' && notEmpty(config[__axis_x_padding])) {
-            paddingLeft = isValue(config[__axis_x_padding].left) ? config[__axis_x_padding].left : padding;
-            paddingRight = isValue(config[__axis_x_padding].right) ? config[__axis_x_padding].right : padding;
-        } else if (typeof config[__axis_x_padding] === 'number') {
-            paddingLeft = paddingRight = config[__axis_x_padding];
+        if (typeof config.axis_x_padding === 'object' && notEmpty(config.axis_x_padding)) {
+            paddingLeft = isValue(config.axis_x_padding.left) ? config.axis_x_padding.left : padding;
+            paddingRight = isValue(config.axis_x_padding.right) ? config.axis_x_padding.right : padding;
+        } else if (typeof config.axis_x_padding === 'number') {
+            paddingLeft = paddingRight = config.axis_x_padding;
         } else {
             paddingLeft = paddingRight = padding;
         }
@@ -1488,27 +1335,27 @@
         if (withUpdateOrgXDomain) {
             $$.x.domain(domain ? domain : $$.d3.extent($$.getXDomain(targets)));
             $$.orgXDomain = $$.x.domain();
-            if (config[__zoom_enabled]) { $$.zoom.scale($$.x).updateScaleExtent(); }
+            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(); }
+            if (config.zoom_enabled) { $$.zoom.scale($$.x).updateScaleExtent(); }
         }
         return $$.x.domain();
     };
 
     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));
+        return (config.data_x && key === config.data_x) || (notEmpty(config.data_xs) && hasValue(config.data_xs, key));
     };
     c3_chart_internal_fn.isNotX = function (key) {
         return !this.isX(key);
     };
     c3_chart_internal_fn.getXKey = function (id) {
         var $$ = this, config = $$.config;
-        return config[__data_x] ? config[__data_x] : notEmpty(config[__data_xs]) ? config[__data_xs][id] : null;
+        return config.data_x ? config.data_x : notEmpty(config.data_xs) ? config.data_xs[id] : null;
     };
     c3_chart_internal_fn.getXValuesOfXKey = function (key, targets) {
         var $$ = this,
@@ -1536,7 +1383,7 @@
     c3_chart_internal_fn.addXs = function (xs) {
         var $$ = this;
         Object.keys(xs).forEach(function (id) {
-            $$.config[__data_xs][id] = xs[id];
+            $$.config.data_xs[id] = xs[id];
         });
     };
     c3_chart_internal_fn.hasMultipleX = function (xs) {
@@ -1544,12 +1391,12 @@
     };
     c3_chart_internal_fn.isMultipleX = function () {
         var $$ = this, config = $$.config;
-        return notEmpty(config[__data_xs]) && $$.hasMultipleX(config[__data_xs]);
+        return notEmpty(config.data_xs) && $$.hasMultipleX(config.data_xs);
     };
     c3_chart_internal_fn.addName = function (data) {
         var $$ = this, name;
         if (data) {
-            name = $$.config[__data_names][data.id];
+            name = $$.config.data_names[data.id];
             data.name = name ? name : data.id;
         }
         return data;
@@ -1704,11 +1551,11 @@
     };
     c3_chart_internal_fn.isOrderDesc = function () {
         var config = this.config;
-        return config[__data_order] && config[__data_order].toLowerCase() === 'desc';
+        return config.data_order && config.data_order.toLowerCase() === 'desc';
     };
     c3_chart_internal_fn.isOrderAsc = function () {
         var config = this.config;
-        return config[__data_order] && config[__data_order].toLowerCase() === 'asc';
+        return config.data_order && config.data_order.toLowerCase() === 'asc';
     };
     c3_chart_internal_fn.orderTargets = function (targets) {
         var $$ = this, config = $$.config, orderAsc = $$.isOrderAsc(), orderDesc = $$.isOrderDesc();
@@ -1719,8 +1566,8 @@
                     t2Sum = t2.values.reduce(reducer, 0);
                 return orderAsc ? t2Sum - t1Sum : t1Sum - t2Sum;
             });
-        } else if (isFunction(config[__data_order])) {
-            targets.sort(config[__data_order]);
+        } else if (isFunction(config.data_order)) {
+            targets.sort(config.data_order);
         } // TODO: accept name array for order
         return targets;
     };
@@ -1732,9 +1579,9 @@
     };
     c3_chart_internal_fn.hasDataLabel = function () {
         var config = this.config;
-        if (typeof config[__data_labels] === 'boolean' && config[__data_labels]) {
+        if (typeof config.data_labels === 'boolean' && config.data_labels) {
             return true;
-        } else if (typeof config[__data_labels] === 'object' && notEmpty(config[__data_labels])) {
+        } else if (typeof config.data_labels === 'object' && notEmpty(config.data_labels)) {
             return true;
         }
         return false;
@@ -1777,7 +1624,7 @@
             max = _max ? _max : values.length - 1,
             med = Math.floor((max - min) / 2) + min,
             value = values[med],
-            diff = $$.x(value.x) - pos[$$.config[__axis_rotated] ? 1 : 0],
+            diff = $$.x(value.x) - pos[$$.config.axis_rotated ? 1 : 0],
             candidates;
 
         // Update range for search
@@ -1826,8 +1673,8 @@
     c3_chart_internal_fn.dist = function (data, pos) {
         var $$ = this, config = $$.config,
             yScale = $$.getAxisId(data.id) === 'y' ? $$.y : $$.y2,
-            xIndex = config[__axis_rotated] ? 1 : 0,
-            yIndex = config[__axis_rotated] ? 0 : 1;
+            xIndex = config.axis_rotated ? 1 : 0,
+            yIndex = config.axis_rotated ? 0 : 1;
         return Math.pow($$.x(data.x) - pos[xIndex], 2) + Math.pow(yScale(data.value) - pos[yIndex], 2);
     };
 
@@ -1862,7 +1709,7 @@
             targetKeys = keys.value;
             if (keys.x) {
                 targetKeys.push(keys.x);
-                $$.config[__data_x] = keys.x;
+                $$.config.data_x = keys.x;
             }
             new_rows.push(targetKeys);
             json.forEach(function (o) {
@@ -1933,11 +1780,11 @@
                     );
                 }
                 // if not included in input data, find from preloaded data of other id's x
-                else if (config[__data_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])) {
+                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
@@ -1956,7 +1803,7 @@
 
         // convert to target
         targets = ids.map(function (id, index) {
-            var convertedId = config[__data_idConverter](id);
+            var convertedId = config.data_idConverter(id);
             return {
                 id: convertedId,
                 id_org: id,
@@ -1964,8 +1811,8 @@
                     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);
+                        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 (isUndefined(d[id]) || $$.data.xs[id].length <= i) {
@@ -1997,8 +1844,8 @@
         });
 
         // set target types
-        if (config[__data_type]) {
-            $$.setTargetType($$.mapToIds(targets).filter(function (id) { return ! (id in config[__data_types]); }), config[__data_type]);
+        if (config.data_type) {
+            $$.setTargetType($$.mapToIds(targets).filter(function (id) { return ! (id in config.data_types); }), config.data_type);
         }
 
         // cache as original id keyed
@@ -2099,7 +1946,7 @@
 
     c3_chart_internal_fn.categoryName = function (i) {
         var config = this.config;
-        return i < config[__axis_x_categories].length ? config[__axis_x_categories][i] : i;
+        return i < config.axis_x_categories.length ? config.axis_x_categories[i] : i;
     };
 
     c3_chart_internal_fn.initEventRect = function () {
@@ -2115,7 +1962,7 @@
 
         // rects for mouseover
         var eventRects = $$.main.select('.' + CLASS[_eventRects])
-                .style('cursor', config[__zoom_enabled] ? config[__axis_rotated] ? 'ns-resize' : 'ew-resize' : null)
+                .style('cursor', config.zoom_enabled ? config.axis_rotated ? 'ns-resize' : 'ew-resize' : null)
                 .classed(CLASS[_eventRectsMultiple], isMultipleX)
                 .classed(CLASS[_eventRectsSingle], !isMultipleX);
 
@@ -2178,10 +2025,10 @@
                     return $$.x(d.x) - (rectW / 2);
                 };
             }
-            x = config[__axis_rotated] ? 0 : rectX;
-            y = config[__axis_rotated] ? rectX : 0;
-            w = config[__axis_rotated] ? $$.width : rectW;
-            h = config[__axis_rotated] ? rectW : $$.height;
+            x = config.axis_rotated ? 0 : rectX;
+            y = config.axis_rotated ? rectX : 0;
+            w = config.axis_rotated ? $$.width : rectW;
+            h = config.axis_rotated ? rectW : $$.height;
         }
 
         eventRectUpdate
@@ -2195,7 +2042,7 @@
         var $$ = this, d3 = $$.d3, config = $$.config;
         eventRectEnter.append("rect")
             .attr("class", $$.classEvent.bind($$))
-            .style("cursor", config[__data_selection_enabled] && config[__data_selection_grouped] ? "pointer" : null)
+            .style("cursor", config.data_selection_enabled && config.data_selection_grouped ? "pointer" : null)
             .on('mouseover', function (d) {
                 var index = d.index, selectedData, newData;
 
@@ -2208,7 +2055,7 @@
 
                 // Sort selectedData as names order
                 newData = [];
-                Object.keys(config[__data_names]).forEach(function (id) {
+                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]);
@@ -2220,12 +2067,12 @@
                 selectedData = newData.concat(selectedData); // Add remained
 
                 // Expand shapes for selection
-                if (config[__point_focus_expand_enabled]) { $$.expandCircles(index); }
+                if (config.point_focus_expand_enabled) { $$.expandCircles(index); }
                 $$.expandBars(index);
 
                 // Call event handler
                 $$.main.selectAll('.' + CLASS[_shape] + '-' + index).each(function (d) {
-                    config[__data_onmouseover].call(c3, d);
+                    config.data_onmouseover.call($$, d);
                 });
             })
             .on('mouseout', function (d) {
@@ -2238,7 +2085,7 @@
                 $$.unexpandBars();
                 // Call event handler
                 $$.main.selectAll('.' + CLASS[_shape] + '-' + index).each(function (d) {
-                    config[__data_onmouseout].call($$, d);
+                    config.data_onmouseout.call($$, d);
                 });
             })
             .on('mousemove', function (d) {
@@ -2253,25 +2100,25 @@
                     return $$.addName($$.getValueOnIndex(t.values, index));
                 });
 
-                if (config[__tooltip_grouped]) {
+                if (config.tooltip_grouped) {
                     $$.showTooltip(selectedData, d3.mouse(this));
                     $$.showXGridFocus(selectedData);
                 }
 
-                if (config[__tooltip_grouped] && (!config[__data_selection_enabled] || config[__data_selection_grouped])) {
+                if (config.tooltip_grouped && (!config.data_selection_enabled || config.data_selection_grouped)) {
                     return;
                 }
 
                 $$.main.selectAll('.' + CLASS[_shape] + '-' + index)
                     .each(function () {
                         d3.select(this).classed(CLASS[_EXPANDED], true);
-                        if (config[__data_selection_enabled]) {
-                            eventRect.style('cursor', config[__data_selection_grouped] ? 'pointer' : null);
+                        if (config.data_selection_enabled) {
+                            eventRect.style('cursor', config.data_selection_grouped ? 'pointer' : null);
                         }
-                        if (!config[__tooltip_grouped]) {
+                        if (!config.tooltip_grouped) {
                             $$.hideXGridFocus();
                             $$.hideTooltip();
-                            if (!config[__data_selection_grouped]) {
+                            if (!config.data_selection_grouped) {
                                 $$.unexpandCircles(index);
                                 $$.unexpandBars();
                             }
@@ -2286,13 +2133,13 @@
                         }
                     })
                     .each(function (d) {
-                        if (config[__data_selection_enabled] && (config[__data_selection_grouped] || config[__data_selection_isselectable](d))) {
+                        if (config.data_selection_enabled && (config.data_selection_grouped || config.data_selection_isselectable(d))) {
                             eventRect.style('cursor', 'pointer');
                         }
-                        if (!config[__tooltip_grouped]) {
+                        if (!config.tooltip_grouped) {
                             $$.showTooltip([d], d3.mouse(this));
                             $$.showXGridFocus([d]);
-                            if (config[__point_focus_expand_enabled]) { $$.expandCircles(index, d.id); }
+                            if (config.point_focus_expand_enabled) { $$.expandCircles(index, d.id); }
                             $$.expandBars(index, d.id);
                         }
                     });
@@ -2356,7 +2203,7 @@
                 $$.showTooltip(selectedData, mouse);
 
                 // expand points
-                if (config[__point_focus_expand_enabled]) {
+                if (config.point_focus_expand_enabled) {
                     $$.unexpandCircles();
                     $$.expandCircles(closest.index, closest.id);
                 }
@@ -2368,12 +2215,12 @@
                 if ($$.dist(closest, mouse) < 100) {
                     $$.svg.select('.' + CLASS[_eventRect]).style('cursor', 'pointer');
                     if (!$$.mouseover) {
-                        config[__data_onmouseover].call($$, closest);
+                        config.data_onmouseover.call($$, closest);
                         $$.mouseover = true;
                     }
                 } else if ($$.mouseover) {
                     $$.svg.select('.' + CLASS[_eventRect]).style('cursor', null);
-                    config[__data_onmouseout].call($$, closest);
+                    config.data_onmouseout.call($$, closest);
                     $$.mouseover = false;
                 }
             })
@@ -2406,40 +2253,40 @@
 
     c3_chart_internal_fn.getCurrentWidth = function () {
         var $$ = this, config = $$.config;
-        return config[__size_width] ? config[__size_width] : $$.getParentWidth();
+        return config.size_width ? config.size_width : $$.getParentWidth();
     };
     c3_chart_internal_fn.getCurrentHeight = function () {
         var $$ = this, config = $$.config,
-            h = config[__size_height] ? config[__size_height] : $$.getParentHeight();
+            h = config.size_height ? config.size_height : $$.getParentHeight();
         return h > 0 ? h : 320;
     };
     c3_chart_internal_fn.getCurrentPaddingTop = function () {
         var config = this.config;
-        return isValue(config[__padding_top]) ? config[__padding_top] : 0;
+        return isValue(config.padding_top) ? config.padding_top : 0;
     };
     c3_chart_internal_fn.getCurrentPaddingBottom = function () {
         var config = this.config;
-        return isValue(config[__padding_bottom]) ? config[__padding_bottom] : 0;
+        return isValue(config.padding_bottom) ? config.padding_bottom : 0;
     };
     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($$.getAxisWidthByAxisId('x')), 40);
+        if (isValue(config.padding_left)) {
+            return config.padding_left;
+        } else if (config.axis_rotated) {
+            return !config.axis_x_show ? 1 : Math.max(ceil10($$.getAxisWidthByAxisId('x')), 40);
         } else {
-            return !config[__axis_y_show] ? 1 : ceil10($$.getAxisWidthByAxisId('y'));
+            return !config.axis_y_show ? 1 : ceil10($$.getAxisWidthByAxisId('y'));
         }
     };
     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]) {
+        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] ? defaultPadding : ceil10($$.getAxisWidthByAxisId('y2'))) + legendWidthOnRight;
+            return (!config.axis_y2_show ? defaultPadding : ceil10($$.getAxisWidthByAxisId('y2'))) + legendWidthOnRight;
         }
     };
 
@@ -2465,7 +2312,7 @@
 
     c3_chart_internal_fn.getSvgLeft = function () {
         var $$ = this, config = $$.config,
-            leftAxisClass = config[__axis_rotated] ? CLASS[_axisX] : CLASS[_axisY],
+            leftAxisClass = config.axis_rotated ? CLASS[_axisX] : CLASS[_axisY],
             leftAxis = $$.main.select('.' + leftAxisClass).node(),
             svgRect = leftAxis ? leftAxis.getBoundingClientRect() : {right: 0},
             chartRect = $$.selectChart.node().getBoundingClientRect(),
@@ -2481,10 +2328,10 @@
     };
     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 $$.rotated_padding_top; }
+        if (axisId === 'x' && !config.axis_x_show) { return 0; }
+        if (axisId === 'x' && config.axis_x_height) { return config.axis_x_height; }
+        if (axisId === 'y' && !config.axis_y_show) { return config.legend_show && !$$.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);
     };
 
@@ -2498,7 +2345,7 @@
         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 : $$.width;
+            return $$.config.axis_rotated ? $$.height : $$.width;
         }
         maxDataCount = $$.getMaxDataCount();
         ratio = ($$.hasType('bar') ? (maxDataCount - ($$.isCategorized() ? 0.25 : 1)) / maxDataCount : 1);
@@ -2510,11 +2357,11 @@
         var $$ = 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]];
+            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;
                     }
                 }
@@ -2590,7 +2437,7 @@
             .attr("class", function (d) { return $$.generateClass(CLASS[_selectedCircles], d.id); });
         mainLineEnter.append('g')
             .attr("class", classCircles)
-            .style("cursor", function (d) { return config[__data_selection_isselectable](d) ? "pointer" : null; });
+            .style("cursor", function (d) { return config.data_selection_isselectable(d) ? "pointer" : null; });
         // Update date for selected circles
         targets.forEach(function (t) {
             $$.main.selectAll('.' + CLASS[_selectedCircles] + $$.getTargetSelectorSuffix(t.id)).selectAll('.' + CLASS[_selectedCircle]).each(function (d) {
@@ -2628,17 +2475,17 @@
             yScaleGetter = isSub ? $$.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($$, d.id)(d.value);
+                return config.data_groups.length > 0 ? getPoint(d, i)[0][1] : yScaleGetter.call($$, 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; }); }
+        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] ? $$.filterRemoveNull(d.values) : d.values,
+            var data = config.line_connect_null ? $$.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 = $$.lineWithRegions(data, x, y, config[__data_regions][d.id]);
+                if (config.data_regions[d.id]) {
+                    path = $$.lineWithRegions(data, x, y, config.data_regions[d.id]);
                 } else {
                     path = line.interpolate($$.getInterpolate(d))(data);
                 }
@@ -2647,7 +2494,7 @@
                     x0 = x(data[0].x);
                     y0 = y(data[0].value);
                 }
-                path = config[__axis_rotated] ? "M " + y0 + " " + x0 : "M " + x0 + " " + y0;
+                path = config.axis_rotated ? "M " + y0 + " " + x0 : "M " + x0 + " " + y0;
             }
             return path ? path : "M 0 0";
         };
@@ -2664,7 +2511,7 @@
                 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 (config.axis_rotated) {
                 if ((0 < d.value && posY < y0) || (d.value < 0 && y0 < posY)) { posY = y0; }
             }
             // 1 point that marks the line position
@@ -2709,8 +2556,8 @@
         }
 
         // 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); };
+        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 ($$.isTimeSeries()) {
@@ -2782,19 +2629,19 @@
             yScaleGetter = isSub ? $$.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($$, d.id)(0);
+                return config.data_groups.length > 0 ? getPoint(d, i)[0][1] : yScaleGetter.call($$, d.id)(0);
             },
             value1 = function (d, i) {
-                return config[__data_groups].length > 0 ? getPoint(d, i)[1][1] : yScaleGetter.call($$, d.id)(d.value);
+                return config.data_groups.length > 0 ? getPoint(d, i)[1][1] : yScaleGetter.call($$, d.id)(d.value);
             };
 
-        area = config[__axis_rotated] ? area.x0(value0).x1(value1).y(xValue) : area.x(xValue).y0(value0).y1(value1);
-        if (!config[__line_connect_null]) {
+        area = config.axis_rotated ? area.x0(value0).x1(value1).y(xValue) : area.x(xValue).y0(value0).y1(value1);
+        if (!config.line_connect_null) {
             area = area.defined(function (d) { return d.value !== null; });
         }
 
         return function (d) {
-            var data = config[__line_connect_null] ? $$.filterRemoveNull(d.values) : d.values, x0 = 0, y0 = 0, path;
+            var data = config.line_connect_null ? $$.filterRemoveNull(d.values) : d.values, x0 = 0, y0 = 0, path;
             if ($$.isAreaType(d)) {
                 path = area.interpolate($$.getInterpolate(d))(data);
             } else {
@@ -2802,7 +2649,7 @@
                     x0 = $$.x(data[0].x);
                     y0 = $$.getYScale(d.id)(data[0].value);
                 }
-                path = config[__axis_rotated] ? "M " + y0 + " " + x0 : "M " + x0 + " " + y0;
+                path = config.axis_rotated ? "M " + y0 + " " + x0 : "M " + x0 + " " + y0;
             }
             return path ? path : "M 0 0";
         };
@@ -2820,7 +2667,7 @@
                 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 (config.axis_rotated) {
                 if ((0 < d.value && posY < y0) || (d.value < 0 && y0 < posY)) { posY = y0; }
             }
             // 1 point that marks the area position
@@ -2861,7 +2708,7 @@
     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);
+        return $$.config.data_groups.length > 0 ? getPoint(d, i)[0][1] : $$.getYScale(d.id)(d.value);
     };
     c3_chart_internal_fn.getCircles = function (i, id) {
         var $$ = this;
@@ -2884,15 +2731,15 @@
     };
     c3_chart_internal_fn.pointR = function (d) {
         var $$ = this, config = $$.config;
-        return config[__point_show] && !$$.isStepType(d) ? (isFunction(config[__point_r]) ? config[__point_r](d) : config[__point_r]) : 0;
+        return config.point_show && !$$.isStepType(d) ? (isFunction(config.point_r) ? config.point_r(d) : config.point_r) : 0;
     };
     c3_chart_internal_fn.pointExpandedR = function (d) {
         var $$ = this, config = $$.config;
-        return config[__point_focus_expand_enabled] ? (config[__point_focus_expand_r] ? config[__point_focus_expand_r] : $$.pointR(d) * 1.75) : $$.pointR(d);
+        return config.point_focus_expand_enabled ? (config.point_focus_expand_r ? config.point_focus_expand_r : $$.pointR(d) * 1.75) : $$.pointR(d);
     };
     c3_chart_internal_fn.pointSelectR = function (d) {
         var $$ = this, config = $$.config;
-        return config[__point_select_r] ? config[__point_select_r] : $$.pointR(d) * 4;
+        return config.point_select_r ? config.point_select_r : $$.pointR(d) * 4;
     };
     c3_chart_internal_fn.isWithinCircle = function (_this, _r) {
         var d3 = this.d3,
@@ -2921,7 +2768,7 @@
         // Bars for each data
         mainBarEnter.append('g')
             .attr("class", classBars)
-            .style("cursor", function (d) { return config[__data_selection_isselectable](d) ? "pointer" : null; });
+            .style("cursor", function (d) { return config.data_selection_isselectable(d) ? "pointer" : null; });
 
     };
     c3_chart_internal_fn.redrawBar = function (durationForExit) {
@@ -2951,8 +2798,8 @@
     };
     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;
+            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;
     };
     c3_chart_internal_fn.getBars = function (i) {
         var $$ = this;
@@ -2974,8 +2821,8 @@
             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 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] + ' ' +
@@ -2999,7 +2846,7 @@
                 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 ($$.config[__axis_rotated]) {
+            if ($$.config.axis_rotated) {
                 if ((0 < d.value && posY < y0) || (d.value < 0 && y0 < posY)) { posY = y0; }
             }
             // 4 points that make a bar
@@ -3048,7 +2895,7 @@
             .data(barOrLineData);
         $$.mainText.enter().append('text')
             .attr("class", classText)
-            .attr('text-anchor', function (d) { return config[__axis_rotated] ? (d.value < 0 ? 'end' : 'start') : 'middle'; })
+            .attr('text-anchor', function (d) { return config.axis_rotated ? (d.value < 0 ? 'end' : 'start') : 'middle'; })
             .style("stroke", 'none')
             .style("fill", function (d) { return $$.color(d); })
             .style("fill-opacity", 0);
@@ -3090,7 +2937,7 @@
     c3_chart_internal_fn.getXForText = function (points, d, textElement) {
         var $$ = this,
             box = textElement.getBoundingClientRect(), xPos, padding;
-        if ($$.config[__axis_rotated]) {
+        if ($$.config.axis_rotated) {
             padding = $$.isBarType(d) ? 4 : 6;
             xPos = points[2][1] + padding * (d.value < 0 ? -1 : 1);
         } else {
@@ -3101,7 +2948,7 @@
     c3_chart_internal_fn.getYForText = function (points, d, textElement) {
         var $$ = this,
             box = textElement.getBoundingClientRect(), yPos;
-        if ($$.config[__axis_rotated]) {
+        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);
@@ -3112,15 +2959,15 @@
     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;
+            $$.withoutFadeIn[id] = (type === config.data_types[id]);
+            config.data_types[id] = type;
         });
         if (!targetIds) {
-            config[__data_type] = type;
+            config.data_type = type;
         }
     };
     c3_chart_internal_fn.hasType = function (type, targets) {
-        var $$ = this, types = $$.config[__data_types], has = false;
+        var $$ = this, types = $$.config.data_types, has = false;
         (targets || $$.data.targets).forEach(function (t) {
             if ((types[t.id] && types[t.id].indexOf(type) >= 0) || (!(t.id in types) && type === 'line')) {
                 has = true;
@@ -3133,39 +2980,39 @@
     };
     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;
+        return !config.data_types[id] || ['line', 'spline', 'area', 'area-spline', 'step', 'area-step'].indexOf(config.data_types[id]) >= 0;
     };
     c3_chart_internal_fn.isStepType = function (d) {
         var id = isString(d) ? d : d.id;
-        return ['step', 'area-step'].indexOf(this.config[__data_types][id]) >= 0;
+        return ['step', 'area-step'].indexOf(this.config.data_types[id]) >= 0;
     };
     c3_chart_internal_fn.isSplineType = function (d) {
         var id = isString(d) ? d : d.id;
-        return ['spline', 'area-spline'].indexOf(this.config[__data_types][id]) >= 0;
+        return ['spline', 'area-spline'].indexOf(this.config.data_types[id]) >= 0;
     };
     c3_chart_internal_fn.isAreaType = function (d) {
         var id = isString(d) ? d : d.id;
-        return ['area', 'area-spline', 'area-step'].indexOf(this.config[__data_types][id]) >= 0;
+        return ['area', 'area-spline', 'area-step'].indexOf(this.config.data_types[id]) >= 0;
     };
     c3_chart_internal_fn.isBarType = function (d) {
         var id = isString(d) ? d : d.id;
-        return this.config[__data_types][id] === 'bar';
+        return this.config.data_types[id] === 'bar';
     };
     c3_chart_internal_fn.isScatterType = function (d) {
         var id = isString(d) ? d : d.id;
-        return this.config[__data_types][id] === 'scatter';
+        return this.config.data_types[id] === 'scatter';
     };
     c3_chart_internal_fn.isPieType = function (d) {
         var id = isString(d) ? d : d.id;
-        return this.config[__data_types][id] === 'pie';
+        return this.config.data_types[id] === 'pie';
     };
     c3_chart_internal_fn.isGaugeType = function (d) {
         var id = isString(d) ? d : d.id;
-        return this.config[__data_types][id] === 'gauge';
+        return this.config.data_types[id] === 'gauge';
     };
     c3_chart_internal_fn.isDonutType = function (d) {
         var id = isString(d) ? d : d.id;
-        return this.config[__data_types][id] === 'donut';
+        return this.config.data_types[id] === 'donut';
     };
     c3_chart_internal_fn.isArcType = function (d) {
         return this.isPieType(d) || this.isDonutType(d) || this.isGaugeType(d);
@@ -3196,15 +3043,15 @@
         $$.grid = $$.main.append('g')
             .attr("clip-path", $$.clipPath)
             .attr('class', CLASS[_grid]);
-        if (config[__grid_x_show]) {
+        if (config.grid_x_show) {
             $$.grid.append("g").attr("class", CLASS[_xgrids]);
         }
-        if (config[__grid_y_show]) {
+        if (config.grid_y_show) {
             $$.grid.append('g').attr('class', CLASS[_ygrids]);
         }
         $$.grid.append('g').attr("class", CLASS[_xgridLines]);
         $$.grid.append('g').attr('class', CLASS[_ygridLines]);
-        if (config[__grid_focus_show]) {
+        if (config.grid_focus_show) {
             $$.grid.append('g')
                 .attr("class", CLASS[_xgridFocus])
                 .append('line')
@@ -3216,10 +3063,10 @@
 
     c3_chart_internal_fn.updateXGrid = function (withoutUpdate) {
         var $$ = this, config = $$.config, CLASS = $$.CLASS, d3 = $$.d3,
-            xgridData = $$.generateGridData(config[__grid_x_type], $$.x),
+            xgridData = $$.generateGridData(config.grid_x_type, $$.x),
             tickOffset = $$.isCategorized() ? $$.xAxis.tickOffset() : 0;
 
-        $$.xgridAttr = config[__axis_rotated] ? {
+        $$.xgridAttr = config.axis_rotated ? {
             'x1': 0,
             'x2': $$.width,
             'y1': function (d) { return $$.x(d) - tickOffset; },
@@ -3236,7 +3083,7 @@
         $$.xgrid.enter().append('line').attr("class", CLASS[_xgrid]);
         if (!withoutUpdate) {
             $$.xgrid.attr($$.xgridAttr)
-                .style("opacity", function () { return +d3.select(this).attr(config[__axis_rotated] ? 'y1' : 'x1') === (config[__axis_rotated] ? $$.height : 0) ? 0 : 1; });
+                .style("opacity", function () { return +d3.select(this).attr(config.axis_rotated ? 'y1' : 'x1') === (config.axis_rotated ? $$.height : 0) ? 0 : 1; });
         }
         $$.xgrid.exit().remove();
     };
@@ -3244,13 +3091,13 @@
     c3_chart_internal_fn.updateYGrid = function () {
         var $$ = this, config = $$.config, CLASS = $$.CLASS;
         $$.ygrid = $$.main.select('.' + CLASS[_ygrids]).selectAll('.' + CLASS[_ygrid])
-            .data($$.y.ticks(config[__grid_y_ticks]));
+            .data($$.y.ticks(config.grid_y_ticks));
         $$.ygrid.enter().append('line')
             .attr('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.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($$.ygrid, 'grid');
     };
@@ -3260,11 +3107,11 @@
         var $$ = this, main = $$.main, config = $$.config, CLASS = $$.CLASS,
             xgridLine, ygridLine, yv;
         main.select('line.' + CLASS[_xgridFocus]).style("visibility", "hidden");
-        if (config[__grid_x_show]) {
+        if (config.grid_x_show) {
             $$.updateXGrid();
         }
         $$.xgridLines = main.select('.' + CLASS[_xgridLines]).selectAll('.' + CLASS[_xgridLine])
-            .data(config[__grid_x_lines]);
+            .data(config.grid_x_lines);
         // enter
         xgridLine = $$.xgridLines.enter().append('g')
             .attr("class", function (d) { return CLASS[_xgridLine] + (d.class ? ' ' + d.class : ''); });
@@ -3272,8 +3119,8 @@
             .style("opacity", 0);
         xgridLine.append('text')
             .attr("text-anchor", "end")
-            .attr("transform", config[__axis_rotated] ? "" : "rotate(-90)")
-            .attr('dx', config[__axis_rotated] ? 0 : -$$.margin.top)
+            .attr("transform", config.axis_rotated ? "" : "rotate(-90)")
+            .attr('dx', config.axis_rotated ? 0 : -$$.margin.top)
             .attr('dy', -5)
             .style("opacity", 0);
         // udpate
@@ -3284,12 +3131,12 @@
             .remove();
 
         // Y-Grid
-        if (withY && config[__grid_y_show]) {
+        if (withY && config.grid_y_show) {
             $$.updateYGrid();
         }
         if (withY) {
             $$.ygridLines = main.select('.' + CLASS[_ygridLines]).selectAll('.' + CLASS[_ygridLine])
-                .data(config[__grid_y_lines]);
+                .data(config.grid_y_lines);
             // enter
             ygridLine = $$.ygridLines.enter().append('g')
                 .attr("class", function (d) { return CLASS[_ygridLine] + (d.class ? ' ' + d.class : ''); });
@@ -3297,22 +3144,22 @@
                 .style("opacity", 0);
             ygridLine.append('text')
                 .attr("text-anchor", "end")
-                .attr("transform", config[__axis_rotated] ? "rotate(-90)" : "")
-                .attr('dx', config[__axis_rotated] ? 0 : -$$.margin.top)
+                .attr("transform", config.axis_rotated ? "rotate(-90)" : "")
+                .attr('dx', config.axis_rotated ? 0 : -$$.margin.top)
                 .attr('dy', -5)
                 .style("opacity", 0);
             // update
             yv = $$.yv.bind($$);
             $$.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)
+                .attr("x1", config.axis_rotated ? yv : 0)
+                .attr("x2", config.axis_rotated ? yv : $$.width)
+                .attr("y1", config.axis_rotated ? 0 : yv)
+                .attr("y2", config.axis_rotated ? $$.height : yv)
                 .style("opacity", 1);
             $$.ygridLines.select('text')
               .transition().duration(duration)
-                .attr("x", config[__axis_rotated] ? 0 : $$.width)
+                .attr("x", config.axis_rotated ? 0 : $$.width)
                 .attr("y", yv)
                 .text(function (d) { return d.text; })
                 .style("opacity", 1);
@@ -3325,13 +3172,13 @@
     c3_chart_internal_fn.addTransitionForGrid = function (transitions) {
         var $$ = this, config = $$.config, xv = $$.xv.bind($$);
         transitions.push($$.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 : $$.height)
+                         .attr("x1", config.axis_rotated ? 0 : xv)
+                         .attr("x2", config.axis_rotated ? $$.width : xv)
+                         .attr("y1", config.axis_rotated ? xv : $$.margin.top)
+                         .attr("y2", config.axis_rotated ? xv : $$.height)
                          .style("opacity", 1));
         transitions.push($$.xgridLines.select('text').transition()
-                         .attr("x", config[__axis_rotated] ? $$.width : 0)
+                         .attr("x", config.axis_rotated ? $$.width : 0)
                          .attr("y", xv)
                          .text(function (d) { return d.text; })
                          .style("opacity", 1));
@@ -3341,14 +3188,14 @@
             dataToShow = selectedData.filter(function (d) { return d && isValue(d.value); }),
             focusEl = $$.main.selectAll('line.' + CLASS[_xgridFocus]),
             xx = $$.xx.bind($$);
-        if (! config[__tooltip_show]) { return; }
+        if (! config.tooltip_show) { return; }
         // Hide when scatter plot exists
         if ($$.hasType('scatter') || $$.hasArcType()) { return; }
         focusEl
             .style("visibility", "visible")
             .data([dataToShow[0]])
-            .attr(config[__axis_rotated] ? 'y1' : 'x1', xx)
-            .attr(config[__axis_rotated] ? 'y2' : 'x2', xx);
+            .attr(config.axis_rotated ? 'y1' : 'x1', xx)
+            .attr(config.axis_rotated ? 'y2' : 'x2', xx);
         $$.smoothLines(focusEl, 'grid');
     };
     c3_chart_internal_fn.hideXGridFocus = function () {
@@ -3357,10 +3204,10 @@
     c3_chart_internal_fn.updateXgridFocus = function () {
         var $$ = 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);
+            .attr("x1", config.axis_rotated ? 0 : -10)
+            .attr("x2", config.axis_rotated ? $$.width : -10)
+            .attr("y1", config.axis_rotated ? -10 : 0)
+            .attr("y2", config.axis_rotated ? -10 : $$.height);
     };
     c3_chart_internal_fn.generateGridData = function (type, scale) {
         var $$ = this,
@@ -3399,12 +3246,12 @@
             classLines = forX ? CLASS[_xgridLines] : CLASS[_ygridLines],
             classLine = forX ? CLASS[_xgridLine] : CLASS.ygridLine;
         $$.main.select('.' + classLines).selectAll('.' + classLine).filter(toRemove)
-            .transition().duration(config[__transition_duration])
+            .transition().duration(config.transition_duration)
             .style('opacity', 0).remove();
         if (forX) {
-            config[__grid_x_lines] = config[__grid_x_lines].filter(toShow);
+            config.grid_x_lines = config.grid_x_lines.filter(toShow);
         } else {
-            config[__grid_y_lines] = config[__grid_y_lines].filter(toShow);
+            config.grid_y_lines = config.grid_y_lines.filter(toShow);
         }
     };
 
@@ -3418,27 +3265,27 @@
             .style("z-index", "10")
             .style("display", "none");
         // Show tooltip if needed
-        if (config[__tooltip_init_show]) {
-            if ($$.isTimeSeries() && isString(config[__tooltip_init_x])) {
-                config[__tooltip_init_x] = $$.parseDate(config[__tooltip_init_x]);
+        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; }
+                    if (($$.data.targets[0].values[i].x - config.tooltip_init_x) === 0) { break; }
                 }
-                config[__tooltip_init_x] = i;
+                config.tooltip_init_x = i;
             }
-            $$.tooltip.html(config[__tooltip_contents].call($$, $$.data.targets.map(function (d) {
-                return $$.addName(d.values[config[__tooltip_init_x]]);
+            $$.tooltip.html(config.tooltip_contents.call($$, $$.data.targets.map(function (d) {
+                return $$.addName(d.values[config.tooltip_init_x]);
             }), $$.getXAxisTickFormat(), $$.getYFormat($$.hasArcType()), $$.color));
-            $$.tooltip.style("top", config[__tooltip_init_position].top)
-                .style("left", config[__tooltip_init_position].left)
+            $$.tooltip.style("top", config.tooltip_init_position.top)
+                .style("left", config.tooltip_init_position.left)
                 .style("display", "block");
         }
     };
     c3_chart_internal_fn.getTooltipContent = function (d, defaultTitleFormat, defaultValueFormat, color) {
         var $$ = this, config = $$.config,
-            titleFormat = config[__tooltip_format_title] || defaultTitleFormat,
-            nameFormat = config[__tooltip_format_name] || function (name) { return name; },
-            valueFormat = config[__tooltip_format_value] || defaultValueFormat,
+            titleFormat = config.tooltip_format_title || defaultTitleFormat,
+            nameFormat = config.tooltip_format_name || function (name) { return name; },
+            valueFormat = config.tooltip_format_value || defaultValueFormat,
             text, i, title, value, name, bgcolor;
         for (i = 0; i < d.length; i++) {
             if (! (d[i] && (d[i].value || d[i].value === 0))) { continue; }
@@ -3464,10 +3311,10 @@
         var tWidth, tHeight, svgLeft, tooltipLeft, tooltipRight, tooltipTop, chartRight;
         var forArc = $$.hasArcType(),
             dataToShow = selectedData.filter(function (d) { return d && isValue(d.value); });
-        if (dataToShow.length === 0 || !config[__tooltip_show]) {
+        if (dataToShow.length === 0 || !config.tooltip_show) {
             return;
         }
-        $$.tooltip.html(config[__tooltip_contents].call($$, selectedData, $$.getXAxisTickFormat(), $$.getYFormat(forArc), $$.color)).style("display", "block");
+        $$.tooltip.html(config.tooltip_contents.call($$, selectedData, $$.getXAxisTickFormat(), $$.getYFormat(forArc), $$.color)).style("display", "block");
 
         // Get tooltip dimensions
         tWidth = $$.tooltip.property('offsetWidth');
@@ -3477,7 +3324,7 @@
             tooltipLeft = ($$.width / 2) + mouse[0];
             tooltipTop = ($$.height / 2) + mouse[1] + 20;
         } else {
-            if (config[__axis_rotated]) {
+            if (config.axis_rotated) {
                 svgLeft = $$.getSvgLeft();
                 tooltipLeft = svgLeft + mouse[0] + 100;
                 tooltipRight = tooltipLeft + tWidth;
@@ -3510,7 +3357,7 @@
     c3_chart_internal_fn.initLegend = function () {
         var $$ = this;
         $$.legend = $$.svg.append("g").attr("transform", $$.getTranslate('legend'));
-        if (!$$.config[__legend_show]) {
+        if (!$$.config.legend_show) {
             $$.legend.style('visibility', 'hidden');
             $$.hiddenLegendIds = $$.mapToIds($$.data.targets);
         }
@@ -3520,8 +3367,8 @@
     };
     c3_chart_internal_fn.updateSizeForLegend = function (legendHeight, legendWidth) {
         var $$ = this, config = $$.config, insetLegendPosition = {
-            top: $$.isLegendTop ? $$.getCurrentPaddingTop() + config[__legend_inset_y] + 5.5 : $$.currentHeight - legendHeight - $$.getCurrentPaddingBottom() - config[__legend_inset_y],
-            left: $$.isLegendLeft ? $$.getCurrentPaddingLeft() + config[__legend_inset_x] + 0.5 : $$.currentWidth - legendWidth - $$.getCurrentPaddingRight() - config[__legend_inset_x] + 0.5
+            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,
@@ -3545,15 +3392,15 @@
     };
     c3_chart_internal_fn.getLegendWidth = function () {
         var $$ = this;
-        return $$.config[__legend_show] ? $$.isLegendRight || $$.isLegendInset ? $$.legendItemWidth * ($$.legendStep + 1) : $$.currentWidth : 0;
+        return $$.config.legend_show ? $$.isLegendRight || $$.isLegendInset ? $$.legendItemWidth * ($$.legendStep + 1) : $$.currentWidth : 0;
     };
     c3_chart_internal_fn.getLegendHeight = function () {
         var $$ = this, config = $$.config, h = 0;
-        if (config[__legend_show]) {
+        if (config.legend_show) {
             if ($$.isLegendRight) {
                 h = $$.currentHeight;
             } else if ($$.isLegendInset) {
-                h = config[__legend_inset_step] ? Math.max(20, $$.legendItemHeight) * (config[__legend_inset_step] + 1) : $$.height;
+                h = config.legend_inset_step ? Math.max(20, $$.legendItemHeight) * (config.legend_inset_step + 1) : $$.height;
             } else {
                 h = Math.max(20, $$.legendItemHeight) * ($$.legendStep + 1);
             }
@@ -3589,8 +3436,8 @@
     };
     c3_chart_internal_fn.showLegend = function (targetIds) {
         var $$ = this, config = $$.config;
-        if (!config[__legend_show]) {
-            config[__legend_show] = true;
+        if (!config.legend_show) {
+            config.legend_show = true;
             $$.legend.style('visibility', 'visible');
         }
         $$.removeHiddenLegendIds(targetIds);
@@ -3601,8 +3448,8 @@
     };
     c3_chart_internal_fn.hideLegend = function (targetIds) {
         var $$ = this, config = $$.config;
-        if (config[__legend_show] && isEmpty(targetIds)) {
-            config[__legend_show] = false;
+        if (config.legend_show && isEmpty(targetIds)) {
+            config.legend_show = false;
             $$.legend.style('visibility', 'hidden');
         }
         $$.addHiddenLegendIds(targetIds);
@@ -3654,7 +3501,7 @@
                 maxHeight = 0;
             }
 
-            if (config[__legend_show] && !$$.isLegendToShow(id)) {
+            if (config.legend_show && !$$.isLegendToShow(id)) {
                 widths[id] = heights[id] = steps[id] = offsets[id] = 0;
                 return;
             }
@@ -3666,7 +3513,7 @@
             if (!maxHeight || itemHeight >= maxHeight) { maxHeight = itemHeight; }
             maxLength = $$.isLegendRight || $$.isLegendInset ? maxHeight : maxWidth;
 
-            if (config[__legend_equally]) {
+            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;
@@ -3706,15 +3553,15 @@
             .style('visibility', function (id) { return $$.isLegendToShow(id) ? 'visible' : 'hidden'; })
             .style('cursor', 'pointer')
             .on('click', function (id) {
-                config[__legend_item_onclick] ? config[__legend_item_onclick].call($$, id) : $$.api.toggle(id);
+                config.legend_item_onclick ? config.legend_item_onclick.call($$, id) : $$.api.toggle(id);
             })
             .on('mouseover', function (id) {
                 $$.d3.select(this).classed(CLASS[_legendItemFocused], true);
                 if (!$$.transiting) {
                     $$.api.focus(id);
                 }
-                if (config[__legend_item_onmouseover]) {
-                    config[__legend_item_onmouseover].call($$, id);
+                if (config.legend_item_onmouseover) {
+                    config.legend_item_onmouseover.call($$, id);
                 }
             })
             .on('mouseout', function (id) {
@@ -3722,12 +3569,12 @@
                 if (!$$.transiting) {
                     $$.api.revert();
                 }
-                if (config[__legend_item_onmouseout]) {
-                    config[__legend_item_onmouseout].call($$, id);
+                if (config.legend_item_onmouseout) {
+                    config.legend_item_onmouseout.call($$, id);
                 }
             });
         l.append('text')
-            .text(function (id) { return isDefined(config[__data_names][id]) ? config[__data_names][id] : id; })
+            .text(function (id) { return isDefined(config.data_names[id]) ? config.data_names[id] : id; })
             .each(function (id, i) { updatePositions(this, id, i === 0); })
             .style("pointer-events", "none")
             .attr('x', $$.isLegendRight || $$.isLegendInset ? xForLegendText : -200)
@@ -3756,7 +3603,7 @@
 
         texts = $$.legend.selectAll('text')
             .data(targetIds)
-            .text(function (id) { return isDefined(config[__data_names][id]) ? config[__data_names][id] : id; }) // MEMO: needed for update
+            .text(function (id) { return isDefined(config.data_names[id]) ? config.data_names[id] : id; }) // MEMO: needed for update
             .each(function (id, i) { updatePositions(this, id, i === 0); });
         (withTransition ? texts.transition() : texts)
             .attr('x', xForLegendText)
@@ -3808,30 +3655,30 @@
             .attr("class", CLASS[_axis] + ' ' + CLASS[_axisX])
             .attr("clip-path", $$.clipPathForXAxis)
             .attr("transform", $$.getTranslate('x'))
-            .style("visibility", config[__axis_x_show] ? 'visible' : 'hidden');
+            .style("visibility", config.axis_x_show ? 'visible' : 'hidden');
         $$.axes.x.append("text")
             .attr("class", CLASS[_axisXLabel])
-            .attr("transform", config[__axis_rotated] ? "rotate(-90)" : "")
+            .attr("transform", config.axis_rotated ? "rotate(-90)" : "")
             .style("text-anchor", $$.textAnchorForXAxisLabel.bind($$));
 
         $$.axes.y = main.append("g")
             .attr("class", CLASS[_axis] + ' ' + CLASS[_axisY])
             .attr("clip-path", $$.clipPathForYAxis)
             .attr("transform", $$.getTranslate('y'))
-            .style("visibility", config[__axis_y_show] ? 'visible' : 'hidden');
+            .style("visibility", config.axis_y_show ? 'visible' : 'hidden');
         $$.axes.y.append("text")
             .attr("class", CLASS[_axisYLabel])
-            .attr("transform", config[__axis_rotated] ? "" : "rotate(-90)")
+            .attr("transform", config.axis_rotated ? "" : "rotate(-90)")
             .style("text-anchor", $$.textAnchorForYAxisLabel.bind($$));
 
         $$.axes.y2 = main.append("g")
             .attr("class", CLASS[_axis] + ' ' + CLASS[_axisY2])
             // clip-path?
             .attr("transform", $$.getTranslate('y2'))
-            .style("visibility", config[__axis_y2_show] ? 'visible' : 'hidden');
+            .style("visibility", config.axis_y2_show ? 'visible' : 'hidden');
         $$.axes.y2.append("text")
             .attr("class", CLASS[_axisY2Label])
-            .attr("transform", config[__axis_rotated] ? "" : "rotate(-90)")
+            .attr("transform", config.axis_rotated ? "" : "rotate(-90)")
             .style("text-anchor", $$.textAnchorForY2AxisLabel.bind($$));
     };
     c3_chart_internal_fn.getXAxis = function (scale, orient, tickFormat, tickValues) {
@@ -3841,15 +3688,15 @@
         // Set tick
         axis.tickFormat(tickFormat).tickValues(tickValues);
         if ($$.isCategorized()) {
-            axis.tickCentered(config[__axis_x_tick_centered]);
-            if (isEmpty(config[__axis_x_tick_culling])) {
-                config[__axis_x_tick_culling] = false;
+            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);
+                    base = diff ? diff : (config.axis_rotated ? $$.height : $$.width);
                 return (base / $$.getMaxDataCount()) / 2;
             };
         }
@@ -3861,17 +3708,17 @@
     };
     c3_chart_internal_fn.getAxisId = function (id) {
         var config = this.config;
-        return id in config[__data_axes] ? config[__data_axes][id] : 'y';
+        return id in config.data_axes ? config.data_axes[id] : 'y';
     };
     c3_chart_internal_fn.getXAxisTickFormat = function () {
         var $$ = this, config = $$.config,
             format = $$.isTimeSeries() ? $$.defaultAxisTimeFormat : $$.isCategorized() ? $$.categoryName : function (v) { return v < 0 ? v.toFixed(0) : v; };
-        if (config[__axis_x_tick_format]) {
-            if (isFunction(config[__axis_x_tick_format])) {
-                format = config[__axis_x_tick_format];
+        if (config.axis_x_tick_format) {
+            if (isFunction(config.axis_x_tick_format)) {
+                format = config.axis_x_tick_format;
             } else if ($$.isTimeSeries()) {
                 format = function (date) {
-                    return date ? $$.axisTimeFormat(config[__axis_x_tick_format])(date) : "";
+                    return date ? $$.axisTimeFormat(config.axis_x_tick_format)(date) : "";
                 };
             }
         }
@@ -3880,11 +3727,11 @@
     c3_chart_internal_fn.getAxisLabelOptionByAxisId = function (axisId) {
         var $$ = this, config = $$.config, option;
         if (axisId === 'y') {
-            option = config[__axis_y_label];
+            option = config.axis_y_label;
         } else if (axisId === 'y2') {
-            option = config[__axis_y2_label];
+            option = config.axis_y2_label;
         } else if (axisId === 'x') {
-            option = config[__axis_x_label];
+            option = config.axis_x_label;
         }
         return option;
     };
@@ -3897,11 +3744,11 @@
             option = $$.getAxisLabelOptionByAxisId(axisId);
         if (isString(option)) {
             if (axisId === 'y') {
-                config[__axis_y_label] = text;
+                config.axis_y_label = text;
             } else if (axisId === 'y2') {
-                config[__axis_y2_label] = text;
+                config.axis_y2_label = text;
             } else if (axisId === 'x') {
-                config[__axis_x_label] = text;
+                config.axis_x_label = text;
             }
         } else if (option) {
             option.text = text;
@@ -3922,13 +3769,13 @@
         };
     };
     c3_chart_internal_fn.getXAxisLabelPosition = function () {
-        return this.getAxisLabelPosition('x', this.config[__axis_rotated] ? 'inner-top' : 'inner-right');
+        return this.getAxisLabelPosition('x', this.config.axis_rotated ? 'inner-top' : 'inner-right');
     };
     c3_chart_internal_fn.getYAxisLabelPosition = function () {
-        return this.getAxisLabelPosition('y', this.config[__axis_rotated] ? 'inner-right' : 'inner-top');
+        return this.getAxisLabelPosition('y', this.config.axis_rotated ? 'inner-right' : 'inner-top');
     };
     c3_chart_internal_fn.getY2AxisLabelPosition = function () {
-        return this.getAxisLabelPosition('y2', this.config[__axis_rotated] ? 'inner-right' : 'inner-top');
+        return this.getAxisLabelPosition('y2', this.config.axis_rotated ? 'inner-right' : 'inner-top');
     };
     c3_chart_internal_fn.getAxisLabelPositionById = function (id) {
         return id === 'y2' ? this.getY2AxisLabelPosition() : id === 'y' ? this.getYAxisLabelPosition() : this.getXAxisLabelPosition();
@@ -3965,36 +3812,36 @@
         }
     };
     c3_chart_internal_fn.xForXAxisLabel = function () {
-        return this.xForAxisLabel(!this.config[__axis_rotated], this.getXAxisLabelPosition());
+        return this.xForAxisLabel(!this.config.axis_rotated, this.getXAxisLabelPosition());
     };
     c3_chart_internal_fn.xForYAxisLabel = function () {
-        return this.xForAxisLabel(this.config[__axis_rotated], this.getYAxisLabelPosition());
+        return this.xForAxisLabel(this.config.axis_rotated, this.getYAxisLabelPosition());
     };
     c3_chart_internal_fn.xForY2AxisLabel = function () {
-        return this.xForAxisLabel(this.config[__axis_rotated], this.getY2AxisLabelPosition());
+        return this.xForAxisLabel(this.config.axis_rotated, this.getY2AxisLabelPosition());
     };
     c3_chart_internal_fn.dxForXAxisLabel = function () {
-        return this.dxForAxisLabel(!this.config[__axis_rotated], this.getXAxisLabelPosition());
+        return this.dxForAxisLabel(!this.config.axis_rotated, this.getXAxisLabelPosition());
     };
     c3_chart_internal_fn.dxForYAxisLabel = function () {
-        return this.dxForAxisLabel(this.config[__axis_rotated], this.getYAxisLabelPosition());
+        return this.dxForAxisLabel(this.config.axis_rotated, this.getYAxisLabelPosition());
     };
     c3_chart_internal_fn.dxForY2AxisLabel = function () {
-        return this.dxForAxisLabel(this.config[__axis_rotated], this.getY2AxisLabelPosition());
+        return this.dxForAxisLabel(this.config.axis_rotated, this.getY2AxisLabelPosition());
     };
     c3_chart_internal_fn.dyForXAxisLabel = function () {
         var $$ = this, config = $$.config,
             position = $$.getXAxisLabelPosition();
-        if (config[__axis_rotated]) {
+        if (config.axis_rotated) {
             return position.isInner ? "1.2em" : -25 - $$.getMaxTickWidth('x');
         } else {
-            return position.isInner ? "-0.5em" : config[__axis_x_height] ? config[__axis_x_height] - 10 : "3em";
+            return position.isInner ? "-0.5em" : config.axis_x_height ? config.axis_x_height - 10 : "3em";
         }
     };
     c3_chart_internal_fn.dyForYAxisLabel = function () {
         var $$ = this,
             position = $$.getYAxisLabelPosition();
-        if ($$.config[__axis_rotated]) {
+        if ($$.config.axis_rotated) {
             return position.isInner ? "-0.5em" : "3em";
         } else {
             return position.isInner ? "1.2em" : -20 - $$.getMaxTickWidth('y');
@@ -4003,7 +3850,7 @@
     c3_chart_internal_fn.dyForY2AxisLabel = function () {
         var $$ = this,
             position = $$.getY2AxisLabelPosition();
-        if ($$.config[__axis_rotated]) {
+        if ($$.config.axis_rotated) {
             return position.isInner ? "1.2em" : "-2.2em";
         } else {
             return position.isInner ? "-0.5em" : 30 + this.getMaxTickWidth('y2');
@@ -4011,15 +3858,15 @@
     };
     c3_chart_internal_fn.textAnchorForXAxisLabel = function () {
         var $$ = this;
-        return $$.textAnchorForAxisLabel(!$$.config[__axis_rotated], $$.getXAxisLabelPosition());
+        return $$.textAnchorForAxisLabel(!$$.config.axis_rotated, $$.getXAxisLabelPosition());
     };
     c3_chart_internal_fn.textAnchorForYAxisLabel = function () {
         var $$ = this;
-        return $$.textAnchorForAxisLabel($$.config[__axis_rotated], $$.getYAxisLabelPosition());
+        return $$.textAnchorForAxisLabel($$.config.axis_rotated, $$.getYAxisLabelPosition());
     };
     c3_chart_internal_fn.textAnchorForY2AxisLabel = function () {
         var $$ = this;
-        return $$.textAnchorForAxisLabel($$.config[__axis_rotated], $$.getY2AxisLabelPosition());
+        return $$.textAnchorForAxisLabel($$.config.axis_rotated, $$.getY2AxisLabelPosition());
     };
 
     c3_chart_internal_fn.xForRotatedTickText = function (r) {
@@ -4044,13 +3891,13 @@
             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]);
+                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]);
+                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());
+                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 () {
@@ -4151,19 +3998,19 @@
     };
     c3_chart_internal_fn.getXAxisClipX = function () {
         var $$ = this;
-        return $$.getAxisClipX(!$$.config[__axis_rotated]);
+        return $$.getAxisClipX(!$$.config.axis_rotated);
     };
     c3_chart_internal_fn.getXAxisClipY = function () {
         var $$ = this;
-        return $$.getAxisClipY(!$$.config[__axis_rotated]);
+        return $$.getAxisClipY(!$$.config.axis_rotated);
     };
     c3_chart_internal_fn.getYAxisClipX = function () {
         var $$ = this;
-        return $$.getAxisClipX($$.config[__axis_rotated]);
+        return $$.getAxisClipX($$.config.axis_rotated);
     };
     c3_chart_internal_fn.getYAxisClipY = function () {
         var $$ = this;
-        return $$.getAxisClipY($$.config[__axis_rotated]);
+        return $$.getAxisClipY($$.config.axis_rotated);
     };
     c3_chart_internal_fn.getAxisClipWidth = function (forHorizontal) {
         var $$ = this;
@@ -4172,23 +4019,23 @@
     };
     c3_chart_internal_fn.getAxisClipHeight = function (forHorizontal) {
         var $$ = this, config = $$.config;
-        return forHorizontal ? (config[__axis_x_height] ? config[__axis_x_height] : 0) + 80 : $$.height + 8;
+        return forHorizontal ? (config.axis_x_height ? config.axis_x_height : 0) + 80 : $$.height + 8;
     };
     c3_chart_internal_fn.getXAxisClipWidth = function () {
         var $$ = this;
-        return $$.getAxisClipWidth(!$$.config[__axis_rotated]);
+        return $$.getAxisClipWidth(!$$.config.axis_rotated);
     };
     c3_chart_internal_fn.getXAxisClipHeight = function () {
         var $$ = this;
-        return $$.getAxisClipHeight(!$$.config[__axis_rotated]);
+        return $$.getAxisClipHeight(!$$.config.axis_rotated);
     };
     c3_chart_internal_fn.getYAxisClipWidth = function () {
         var $$ = this;
-        return $$.getAxisClipWidth($$.config[__axis_rotated]);
+        return $$.getAxisClipWidth($$.config.axis_rotated);
     };
     c3_chart_internal_fn.getYAxisClipHeight = function () {
         var $$ = this;
-        return $$.getAxisClipHeight($$.config[__axis_rotated]);
+        return $$.getAxisClipHeight($$.config.axis_rotated);
     };
 
     c3_chart_internal_fn.initPie = function () {
@@ -4196,14 +4043,14 @@
         $$.pie = d3.layout.pie().value(function (d) {
             return d.values.reduce(function (a, b) { return a + b.value; }, 0);
         });
-        if (!config[__data_order] || !config[__pie_sort] || !config[__donut_sort]) {
+        if (!config.data_order || !config.pie_sort || !config.donut_sort) {
             $$.pie.sort(null);
         }
     };
 
     c3_chart_internal_fn.updateRadius = function () {
         var $$ = this, config = $$.config,
-            w = config[__gauge_width] || config[__donut_width];
+            w = config.gauge_width || config.donut_width;
         $$.radiusExpanded = Math.min($$.arcWidth, $$.arcHeight) / 2;
         $$.radius = $$.radiusExpanded * 0.95;
         $$.innerRadiusRatio = w ? ($$.radius - w) / $$.radius : 0.6;
@@ -4232,7 +4079,7 @@
             d.endAngle = d.startAngle;
         }
         if ($$.isGaugeType(d.data)) {
-            var gMin = config[__gauge_min], gMax = config[__gauge_max],
+            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));
@@ -4345,15 +4192,15 @@
 
     c3_chart_internal_fn.shouldExpand = function (id) {
         var $$ = this, config = $$.config;
-        return ($$.isDonutType(id) && config[__donut_expand]) || ($$.isGaugeType(id) && config[__gauge_expand]) || ($$.isPieType(id) && config[__pie_expand]);
+        return ($$.isDonutType(id) && config.donut_expand) || ($$.isGaugeType(id) && config.gauge_expand) || ($$.isPieType(id) && config.pie_expand);
     };
 
     c3_chart_internal_fn.shouldShowArcLabel = function () {
         var $$ = this, config = $$.config, shouldShow = true;
         if ($$.hasType('donut')) {
-            shouldShow = config[__donut_label_show];
+            shouldShow = config.donut_label_show;
         } else if ($$.hasType('pie')) {
-            shouldShow = config[__pie_label_show];
+            shouldShow = config.pie_label_show;
         }
         // when gauge, always true
         return shouldShow;
@@ -4361,24 +4208,24 @@
 
     c3_chart_internal_fn.meetsArcLabelThreshold = function (ratio) {
         var $$ = this, config = $$.config,
-            threshold = $$.hasType('donut') ? config[__donut_label_threshold] : config[__pie_label_threshold];
+            threshold = $$.hasType('donut') ? config.donut_label_threshold : config.pie_label_threshold;
         return ratio >= threshold;
     };
 
     c3_chart_internal_fn.getArcLabelFormat = function () {
         var $$ = this, config = $$.config,
-            format = config[__pie_label_format];
+            format = config.pie_label_format;
         if ($$.hasType('gauge')) {
-            format = config[__gauge_label_format];
+            format = config.gauge_label_format;
         } else if ($$.hasType('donut')) {
-            format = config[__donut_label_format];
+            format = config.donut_label_format;
         }
         return format;
     };
 
     c3_chart_internal_fn.getArcTitle = function () {
         var $$ = this;
-        return $$.hasType('donut') ? $$.config[__donut_title] : "";
+        return $$.hasType('donut') ? $$.config.donut_title : "";
     };
 
     c3_chart_internal_fn.descByStartAngle = function (a, b) {
@@ -4425,7 +4272,7 @@
         mainArc.enter().append('path')
             .attr("class", $$.classArc.bind($$))
             .style("fill", function (d) { return $$.color(d.data); })
-            .style("cursor", function (d) { return config[__data_selection_isselectable](d) ? "pointer" : null; })
+            .style("cursor", function (d) { return config.data_selection_isselectable(d) ? "pointer" : null; })
             .style("opacity", 0)
             .each(function (d) {
                 if ($$.isGaugeType(d.data)) {
@@ -4443,7 +4290,7 @@
                 // transitions
                 $$.expandArc(updated.data.id);
                 $$.toggleFocusLegend(updated.data.id, true);
-                $$.config[__data_onmouseover](arcData, this);
+                $$.config.data_onmouseover(arcData, this);
             })
             .on('mousemove', function (d) {
                 var updated = $$.updateAngle(d),
@@ -4462,7 +4309,7 @@
                 $$.unexpandArc(updated.data.id);
                 $$.revertLegend();
                 $$.hideTooltip();
-                $$.config[__data_onmouseout](arcData, this);
+                $$.config.data_onmouseout(arcData, this);
             })
             .on('click', function (d, i) {
                 var updated, arcData;
@@ -4525,7 +4372,7 @@
                 .attr("class", CLASS[_chartArcsBackground])
                 .attr("d", function () {
                     var d = {
-                        data: [{value: config[__gauge_max]}],
+                        data: [{value: config.gauge_max}],
                         startAngle: -1 * (Math.PI / 2),
                         endAngle: Math.PI / 2
                     };
@@ -4536,21 +4383,21 @@
                 .attr("class", CLASS[_chartArcsGaugeUnit])
                 .style("text-anchor", "middle")
                 .style("pointer-events", "none")
-                .text(config[__gauge_label_show] ? config[__gauge_units] : '');
+                .text(config.gauge_label_show ? config.gauge_units : '');
             arcs.append("text")
                 .attr("dx", -1 * ($$.innerRadius + (($$.radius - $$.innerRadius) / 2)) + "px")
                 .attr("dy", "1.2em")
                 .attr("class", CLASS[_chartArcsGaugeMin])
                 .style("text-anchor", "middle")
                 .style("pointer-events", "none")
-                .text(config[__gauge_label_show] ? config[__gauge_min] : '');
+                .text(config.gauge_label_show ? config.gauge_min : '');
             arcs.append("text")
                 .attr("dx", $$.innerRadius + (($$.radius - $$.innerRadius) / 2) + "px")
                 .attr("dy", "1.2em")
                 .attr("class", CLASS[_chartArcsGaugeMax])
                 .style("text-anchor", "middle")
                 .style("pointer-events", "none")
-                .text(config[__gauge_label_show] ? config[__gauge_max] : '');
+                .text(config.gauge_label_show ? config.gauge_max : '');
         }
     };
 
@@ -4563,7 +4410,7 @@
     c3_chart_internal_fn.redrawRegion = function (duration) {
         var $$ = this, config = $$.config, CLASS = $$.CLASS;
         $$.mainRegion = $$.main.select('.' + CLASS[_regions]).selectAll('.' + CLASS[_region])
-            .data(config[__regions]);
+            .data(config.regions);
         $$.mainRegion.enter().append('g')
             .attr('class', $$.classRegion.bind($$))
           .append('rect')
@@ -4589,9 +4436,9 @@
         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;
+            xPos = config.axis_rotated ? ('start' in d ? yScale(d.start) : 0) : 0;
         } else {
-            xPos = config[__axis_rotated] ? 0 : ('start' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.start) : d.start) : 0);
+            xPos = config.axis_rotated ? 0 : ('start' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.start) : d.start) : 0);
         }
         return xPos;
     };
@@ -4599,9 +4446,9 @@
         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);
+            yPos = config.axis_rotated ? 0 : ('end' in d ? yScale(d.end) : 0);
         } else {
-            yPos = config[__axis_rotated] ? ('start' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.start) : d.start) : 0) : 0;
+            yPos = config.axis_rotated ? ('start' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.start) : d.start) : 0) : 0;
         }
         return yPos;
     };
@@ -4609,9 +4456,9 @@
         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) : $$.width;
+            end = config.axis_rotated ? ('end' in d ? yScale(d.end) : $$.width) : $$.width;
         } else {
-            end = config[__axis_rotated] ? $$.width : ('end' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.end) : d.end) : $$.width);
+            end = config.axis_rotated ? $$.width : ('end' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.end) : d.end) : $$.width);
         }
         return end < start ? 0 : end - start;
     };
@@ -4619,9 +4466,9 @@
         var $$ = 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) : $$.height);
+            end = config.axis_rotated ? $$.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;
+            end = config.axis_rotated ? ('end' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.end) : d.end) : $$.height) : $$.height;
         }
         return end < start ? 0 : end - start;
     };
@@ -4634,9 +4481,9 @@
         var sx, sy, mx, my, minX, maxX, minY, maxY;
 
         if ($$.hasArcType()) { return; }
-        if (! config[__data_selection_enabled]) { return; } // do nothing if not selectable
-        if (config[__zoom_enabled] && ! $$.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
+        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];
@@ -4644,8 +4491,8 @@
         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);
+        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)
@@ -4654,7 +4501,7 @@
             .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); })
+            .filter(function (d) { return config.data_selection_isselectable(d); })
             .each(function (d, i) {
                 var shape = d3.select(this),
                     isSelected = shape.classed(CLASS[_SELECTED]),
@@ -4690,19 +4537,19 @@
     c3_chart_internal_fn.dragstart = function (mouse) {
         var $$ = this, config = $$.config;
         if ($$.hasArcType()) { return; }
-        if (! config[__data_selection_enabled]) { return; } // do nothing if not selectable
+        if (! config.data_selection_enabled) { return; } // do nothing if not selectable
         $$.dragStart = mouse;
         $$.main.select('.' + CLASS[_chart]).append('rect')
             .attr('class', CLASS[_dragarea])
             .style('opacity', 0.1);
         $$.dragging = true;
-        $$.config[__data_ondragstart]();
+        $$.config.data_ondragstart();
     };
 
     c3_chart_internal_fn.dragend = function () {
         var $$ = this, config = $$.config;
         if ($$.hasArcType()) { return; }
-        if (! config[__data_selection_enabled]) { return; } // do nothing if not selectable
+        if (! config.data_selection_enabled) { return; } // do nothing if not selectable
         $$.main.select('.' + CLASS[_dragarea])
             .transition().duration(100)
             .style('opacity', 0)
@@ -4710,16 +4557,16 @@
         $$.main.selectAll('.' + CLASS[_shape])
             .classed(CLASS[_INCLUDED], false);
         $$.dragging = false;
-        $$.config[__data_ondragend]();
+        $$.config.data_ondragend();
     };
 
 
     c3_chart_internal_fn.selectPoint = function (target, d, i) {
         var $$ = this, config = $$.config,
-            cx = (config[__axis_rotated] ? $$.circleY : $$.circleX).bind($$),
-            cy = (config[__axis_rotated] ? $$.circleX : $$.circleY).bind($$),
+            cx = (config.axis_rotated ? $$.circleY : $$.circleX).bind($$),
+            cy = (config.axis_rotated ? $$.circleX : $$.circleY).bind($$),
             r = $$.pointSelectR.bind($$);
-        config[__data_onselected].call($$.api, d, target.node());
+        config.data_onselected.call($$.api, d, target.node());
         // add selected-circle on low layer g
         $$.main.select('.' + CLASS[_selectedCircles] + $$.getTargetSelectorSuffix(d.id)).selectAll('.' + CLASS[_selectedCircle] + '-' + i)
             .data([d])
@@ -4734,7 +4581,7 @@
     };
     c3_chart_internal_fn.unselectPoint = function (target, d, i) {
         var $$ = this;
-        $$.config[__data_onunselected](d, target.node());
+        $$.config.data_onunselected(d, target.node());
         // remove selected-circle from low layer g
         $$.main.select('.' + CLASS[_selectedCircles] + $$.getTargetSelectorSuffix(d.id)).selectAll('.' + CLASS[_selectedCircle] + '-' + i)
             .transition().duration(100).attr('r', 0)
@@ -4745,13 +4592,13 @@
     };
     c3_chart_internal_fn.selectBar = function (target, d) {
         var $$ = this;
-        $$.config[__data_onselected].call($$, d, target.node());
+        $$.config.data_onselected.call($$, d, target.node());
         target.transition().duration(100)
             .style("fill", function () { return $$.d3.rgb($$.color(d)).brighter(0.75); });
     };
     c3_chart_internal_fn.unselectBar = function (target, d) {
         var $$ = this;
-        $$.config[__data_onunselected].call($$, d, target.node());
+        $$.config.data_onunselected.call($$, d, target.node());
         target.transition().duration(100)
             .style("fill", function () { return $$.color(d); });
     };
@@ -4782,10 +4629,10 @@
                 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] ? $$.getTargetSelectorSuffix(d.id) : "")).selectAll('.' + CLASS[_shape]).each(function (d, i) {
+        if (config.data_selection_grouped || isWithin) {
+            if (config.data_selection_enabled && config.data_selection_isselectable(d)) {
+                if (!config.data_selection_multiple) {
+                    $$.main.selectAll('.' + CLASS[_shapes] + (config.data_selection_grouped ? $$.getTargetSelectorSuffix(d.id) : "")).selectAll('.' + CLASS[_shape]).each(function (d, i) {
                         var shape = d3.select(this);
                         if (shape.classed(CLASS[_SELECTED])) { toggle.call($$, false, shape.classed(CLASS[_SELECTED], false), d, i); }
                     });
@@ -4793,7 +4640,7 @@
                 shape.classed(CLASS[_SELECTED], !isSelected);
                 toggle.call($$, !isSelected, shape, d, i);
             }
-            $$.config[__data_onclick].call($$.api, d, that);
+            $$.config.data_onclick.call($$.api, d, that);
         }
     };
 
@@ -4805,14 +4652,14 @@
             return this;
         };
         $$.brush.scale = function (scale) {
-            return $$.config[__axis_rotated] ? this.y(scale) : this.x(scale);
+            return $$.config.axis_rotated ? this.y(scale) : this.x(scale);
         };
     };
     c3_chart_internal_fn.initSubchart = function () {
         var $$ = this, config = $$.config,
             context = $$.context = $$.svg.append("g").attr("transform", $$.getTranslate('context'));
 
-        if (!config[__subchart_show]) {
+        if (!config.subchart_show) {
             context.style('visibility', 'hidden');
         }
 
@@ -4835,14 +4682,14 @@
             .attr("class", CLASS[_brush])
             .call($$.brush)
             .selectAll("rect")
-            .attr(config[__axis_rotated] ? "width" : "height", config[__axis_rotated] ? $$.width2 : $$.height2);
+            .attr(config.axis_rotated ? "width" : "height", config.axis_rotated ? $$.width2 : $$.height2);
 
         // ATTENTION: This must be called AFTER chart added
         // Add Axis
         $$.axes.subx = context.append("g")
             .attr("class", CLASS[_axisX])
             .attr("transform", $$.getTranslate('subx'))
-            .attr("clip-path", config[__axis_rotated] ? "" : $$.clipPathForXAxis);
+            .attr("clip-path", config.axis_rotated ? "" : $$.clipPathForXAxis);
     };
     c3_chart_internal_fn.updateTargetsForSubchart = function (targets) {
         var $$ = this, context = $$.context, config = $$.config,
@@ -4853,7 +4700,7 @@
             classLines = $$.classLines.bind($$),
             classAreas = $$.classAreas.bind($$);
 
-        if (config[__subchart_show]) {
+        if (config.subchart_show) {
             contextBarUpdate = context.select('.' + CLASS[_chartBars]).selectAll('.' + CLASS[_chartBar])
                 .data(targets)
                 .attr('class', classChartBar);
@@ -4890,7 +4737,7 @@
             initialOpacity = $$.initialOpacity.bind($$);
 
         // subchart
-        if (config[__subchart_show]) {
+        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();
@@ -4899,8 +4746,8 @@
             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]);
+                if (!config.axis_rotated && config.axis_x_tick_rotate) {
+                    $$.rotateTickText($$.axes.subx, transitions.axisSubX, config.axis_x_tick_rotate);
                 }
 
                 // extent rect
@@ -4967,7 +4814,7 @@
             withSubchart: false,
             withUpdateXDomain: true
         });
-        $$.config[__subchart_onbrush].call($$.api, x.orgDomain());
+        $$.config.subchart_onbrush.call($$.api, x.orgDomain());
     };
     c3_chart_internal_fn.transformContext = function (withTransition, transitions) {
         var $$ = this, subXAxis;
@@ -4989,10 +4836,10 @@
             })
             .on("zoom", function () { $$.redrawForZoom.call($$); });
         $$.zoom.scale = function (scale) {
-            return config[__axis_rotated] ? this.y(scale) : this.x(scale);
+            return config.axis_rotated ? this.y(scale) : this.x(scale);
         };
         $$.zoom.orgScaleExtent = function () {
-            var extent = config[__zoom_extent] ? config[__zoom_extent] : [1, 10];
+            var extent = config.zoom_extent ? config.zoom_extent : [1, 10];
             return [extent[0], Math.max($$.getMaxDataCount() / extent[1], extent[1])];
         };
         $$.zoom.updateScaleExtent = function () {
@@ -5003,13 +4850,13 @@
         };
     };
     c3_chart_internal_fn.updateZoom = function () {
-        var $$ = this, z = $$.config[__zoom_enabled] ? $$.zoom : function () {};
+        var $$ = this, z = $$.config.zoom_enabled ? $$.zoom : function () {};
         $$.main.select('.' + $$.CLASS[_zoomRect]).call(z);
         $$.main.selectAll('.' + $$.CLASS[_eventRect]).call(z);
     };
     c3_chart_internal_fn.redrawForZoom = function () {
         var $$ = this, d3 = $$.d3, config = $$.config, zoom = $$.zoom, x = $$.x, orgXDomain = $$.orgXDomain;
-        if (!config[__zoom_enabled]) {
+        if (!config.zoom_enabled) {
             return;
         }
         if ($$.filterTargetsToShow($$.data.targets).length === 0) {
@@ -5031,14 +4878,14 @@
         if (d3.event.sourceEvent.type === 'mousemove') {
             $$.cancelClick = true;
         }
-        config[__zoom_onzoom].call($$.api, x.orgDomain());
+        config.zoom_onzoom.call($$.api, x.orgDomain());
     };
 
     c3_chart_internal_fn.generateColor = function () {
         var $$ = this, config = $$.config, d3 = $$.d3,
-            colors = config[__data_colors],
-            pattern = notEmpty(config[__color_pattern]) ? config[__color_pattern] : d3.scale.category10().range(),
-            callback = config[__data_color],
+            colors = config.data_colors,
+            pattern = notEmpty(config.color_pattern) ? config.color_pattern : d3.scale.category10().range(),
+            callback = config.data_color,
             ids = [];
 
         return function (d) {
@@ -5063,12 +4910,12 @@
     };
     c3_chart_internal_fn.generateLevelColor = function () {
         var $$ = this, config = $$.config,
-            colors = config[__color_pattern],
-            threshold = config[__color_threshold],
+            colors = config.color_pattern,
+            threshold = config.color_threshold,
             asValue = threshold.unit === 'value',
             values = threshold.values && threshold.values.length ? threshold.values : [],
             max = threshold.max || 100;
-        return notEmpty(config[__color_threshold]) ? function (value) {
+        return notEmpty(config.color_threshold) ? function (value) {
             var i, v, color = colors[colors.length - 1];
             for (i = 0; i < values.length; i++) {
                 v = asValue ? value : (value * 100 / max);
@@ -5092,12 +4939,12 @@
     };
     c3_chart_internal_fn.yFormat = function (v) {
         var $$ = this, config = $$.config,
-            format = config[__axis_y_tick_format] ? config[__axis_y_tick_format] : $$.defaultValueFormat;
+            format = config.axis_y_tick_format ? config.axis_y_tick_format : $$.defaultValueFormat;
         return format(v);
     };
     c3_chart_internal_fn.y2Format = function (v) {
         var $$ = this, config = $$.config,
-            format = config[__axis_y2_tick_format] ? config[__axis_y2_tick_format] : $$.defaultValueFormat;
+            format = config.axis_y2_tick_format ? config.axis_y2_tick_format : $$.defaultValueFormat;
         return format(v);
     };
     c3_chart_internal_fn.defaultValueFormat = function (v) {
@@ -5107,7 +4954,7 @@
         return (ratio * 100).toFixed(1) + '%';
     };
     c3_chart_internal_fn.formatByAxisId = function (axisId) {
-        var $$ = this, data_labels = $$.config[__data_labels],
+        var $$ = this, data_labels = $$.config.data_labels,
             format = function (v) { return isValue(v) ? +v : ""; };
         // find format according to axis id
         if (data_labels.format) {
@@ -5335,7 +5182,7 @@
     };
     c3_chart_internal_fn.classTarget = function (id) {
         var $$ = this;
-        var additionalClassSuffix = $$.config[__data_classes][id], additionalClass = '';
+        var additionalClassSuffix = $$.config.data_classes[id], additionalClass = '';
         if (additionalClassSuffix) {
             additionalClass = ' ' + CLASS[_target] + '-' + additionalClassSuffix;
         }
@@ -5514,7 +5361,7 @@
     };
     c3_chart_fn.zoom.enable = function (enabled) {
         var $$ = this.internal;
-        $$.config[__zoom_enabled] = enabled;
+        $$.config.zoom_enabled = enabled;
         $$.updateAndRedraw();
     };
     c3_chart_fn.unzoom = function () {
@@ -5532,12 +5379,12 @@
         // update classes if exists
         if ('classes' in args) {
             Object.keys(args.classes).forEach(function (id) {
-                config[__data_classes][id] = args.classes[id];
+                config.data_classes[id] = args.classes[id];
             });
         }
         // update categories if exists
         if ('categories' in args && $$.isCategorized()) {
-            config[__axis_x_categories] = args.categories;
+            config.axis_x_categories = args.categories;
         }
         // use cache if exists
         if ('cacheIds' in args && $$.hasCaches(args.cacheIds)) {
@@ -5696,7 +5543,7 @@
             flow: {
                 index: baseValue.index,
                 length: length,
-                duration: isValue(args.duration) ? args.duration : $$.config[__transition_duration],
+                duration: isValue(args.duration) ? args.duration : $$.config.transition_duration,
                 done: args.done,
                 orgDataCount: orgDataCount,
             },
@@ -5809,10 +5656,10 @@
                 xgridLines
                     .attr('transform', null);
                 xgridLines.select('line')
-                    .attr("x1", config[__axis_rotated] ? 0 : xv)
-                    .attr("x2", config[__axis_rotated] ? $$.width : xv);
+                    .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("x", config.axis_rotated ? $$.width : 0)
                     .attr("y", xv);
                 mainBar
                     .attr('transform', null)
@@ -5855,10 +5702,10 @@
     };
     c3_chart_fn.select = function (ids, indices, resetOther) {
         var $$ = this.internal, d3 = $$.d3, config = $$.config;
-        if (! config[__data_selection_enabled]) { return; }
+        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,
+                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
@@ -5866,7 +5713,7 @@
                 return;
             }
             if (isTargetId && isTargetIndex) {
-                if (config[__data_selection_isselectable](d) && !isSelected) {
+                if (config.data_selection_isselectable(d) && !isSelected) {
                     toggle(true, shape.classed(CLASS[_SELECTED], true), d, i);
                 }
             } else if (isDefined(resetOther) && resetOther) {
@@ -5878,10 +5725,10 @@
     };
     c3_chart_fn.unselect = function (ids, indices) {
         var $$ = this.internal, d3 = $$.d3, config = $$.config;
-        if (! config[__data_selection_enabled]) { return; }
+        if (! config.data_selection_enabled) { return; }
         $$.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,
+                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
@@ -5889,7 +5736,7 @@
                 return;
             }
             if (isTargetId && isTargetIndex) {
-                if (config[__data_selection_isselectable](d)) {
+                if (config.data_selection_isselectable(d)) {
                     if (isSelected) {
                         toggle(false, shape.classed(CLASS[_SELECTED], false), d, i);
                     }
@@ -5916,22 +5763,22 @@
 
     c3_chart_fn.groups = function (groups) {
         var $$ = this.internal, config = $$.config;
-        if (isUndefined(groups)) { return config[__data_groups]; }
-        config[__data_groups] = groups;
+        if (isUndefined(groups)) { return config.data_groups; }
+        config.data_groups = groups;
         $$.redraw();
-        return config[__data_groups];
+        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;
+        if (! grids) { return config.grid_x_lines; }
+        config.grid_x_lines = grids;
         $$.redraw();
-        return config[__grid_x_lines];
+        return config.grid_x_lines;
     };
     c3_chart_fn.xgrids.add = function (grids) {
         var $$ = this.internal;
-        return this.xgrids($$.config[__grid_x_lines].concat(grids ? grids : []));
+        return this.xgrids($$.config.grid_x_lines.concat(grids ? grids : []));
     };
     c3_chart_fn.xgrids.remove = function (params) { // TODO: multiple
         var $$ = this.internal;
@@ -5940,14 +5787,14 @@
 
     c3_chart_fn.ygrids = function (grids) {
         var $$ = this.internal, config = $$.config;
-        if (! grids) { return config[__grid_y_lines]; }
-        config[__grid_y_lines] = grids;
+        if (! grids) { return config.grid_y_lines; }
+        config.grid_y_lines = grids;
         $$.redraw();
-        return config[__grid_y_lines];
+        return config.grid_y_lines;
     };
     c3_chart_fn.ygrids.add = function (grids) {
         var $$ = this.internal;
-        return this.ygrids($$.config[__grid_y_lines].concat(grids ? grids : []));
+        return this.ygrids($$.config.grid_y_lines.concat(grids ? grids : []));
     };
     c3_chart_fn.ygrids.remove = function (params) { // TODO: multiple
         var $$ = this.internal;
@@ -5956,24 +5803,24 @@
 
     c3_chart_fn.regions = function (regions) {
         var $$ = this.internal, config = $$.config;
-        if (!regions) { return config[__regions]; }
-        config[__regions] = regions;
+        if (!regions) { return config.regions; }
+        config.regions = regions;
         $$.redraw();
-        return config[__regions];
+        return config.regions;
     };
     c3_chart_fn.regions.add = function (regions) {
         var $$ = this.internal, config = $$.config;
-        if (!regions) { return config[__regions]; }
-        config[__regions] = config[__regions].concat(regions);
+        if (!regions) { return config.regions; }
+        config.regions = config.regions.concat(regions);
         $$.redraw();
-        return config[__regions];
+        return config.regions;
     };
     c3_chart_fn.regions.remove = function (options) {
         var $$ = this.internal, config = $$.config,
             duration, classes, regions;
 
         options = options || {};
-        duration = $$.getOption(options, "duration", config[__transition_duration]);
+        duration = $$.getOption(options, "duration", config.transition_duration);
         classes = $$.getOption(options, "classes", [CLASS[_region]]);
 
         regions = $$.main.select('.' + CLASS[_regions]).selectAll(classes.map(function (c) { return '.' + c; }));
@@ -5981,7 +5828,7 @@
             .style('opacity', 0)
             .remove();
 
-        config[__regions] = config[__regions].filter(function (region) {
+        config.regions = config.regions.filter(function (region) {
             var found = false;
             if (!region.class) {
                 return true;
@@ -5992,7 +5839,7 @@
             return !found;
         });
 
-        return config[__regions];
+        return config.regions;
     };
 
     c3_chart_fn.data = function () {};
@@ -6006,37 +5853,37 @@
     };
     c3_chart_fn.data.names = function (names) {
         var $$ = this.internal, config = $$.config;
-        if (!arguments.length) { return config[__data_names]; }
+        if (!arguments.length) { return config.data_names; }
         Object.keys(names).forEach(function (id) {
-            config[__data_names][id] = names[id];
+            config.data_names[id] = names[id];
         });
         $$.redraw({withLegend: true});
-        return config[__data_names];
+        return config.data_names;
     };
     c3_chart_fn.data.colors = function (colors) {
         var $$ = this.internal, config = $$.config;
-        if (!arguments.length) { return config[__data_colors]; }
+        if (!arguments.length) { return config.data_colors; }
         Object.keys(colors).forEach(function (id) {
-            config[__data_colors][id] = colors[id];
+            config.data_colors[id] = colors[id];
         });
         $$.redraw({withLegend: true});
-        return config[__data_colors];
+        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;
+            config.axis_x_categories[i] = category;
             $$.redraw();
         }
-        return config[__axis_x_categories][i];
+        return config.axis_x_categories[i];
     };
     c3_chart_fn.categories = function (categories) {
         var $$ = this.internal, config = $$.config;
-        if (!arguments.length) { return config[__axis_x_categories]; }
-        config[__axis_x_categories] = categories;
+        if (!arguments.length) { return config.axis_x_categories; }
+        config.axis_x_categories = categories;
         $$.redraw();
-        return config[__axis_x_categories];
+        return config.axis_x_categories;
     };
 
     // TODO: fix
@@ -6077,11 +5924,11 @@
         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; }
+                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;
+                config.axis_y_max = config.axis_y2_max = max;
             }
             $$.redraw({withUpdateOrgXDomain: true, withUpdateXDomain: true});
         }
@@ -6090,11 +5937,11 @@
         var $$ = this.internal, config = $$.config;
         if (arguments.length) {
             if (typeof min === 'object') {
-                if (isValue(min.x)) { config[__axis_x_min] = min.x; }
-                if (isValue(min.y)) { config[__axis_y_min] = min.y; }
-                if (isValue(min.y2)) { config[__axis_y2_min] = min.y2; }
+                if (isValue(min.x)) { config.axis_x_min = min.x; }
+                if (isValue(min.y)) { config.axis_y_min = min.y; }
+                if (isValue(min.y2)) { config.axis_y2_min = min.y2; }
             } else {
-                config[__axis_y_min] = config[__axis_y2_min] = min;
+                config.axis_y_min = config.axis_y2_min = min;
             }
             $$.redraw({withUpdateOrgXDomain: true, withUpdateXDomain: true});
         }
@@ -6120,8 +5967,8 @@
 
     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;
+        config.size_width = size ? size.width : null;
+        config.size_height = size ? size.height : null;
         this.flush();
     };
 
diff --git a/c3.min.js b/c3.min.js
index b9df0ff..95a879e 100644
--- a/c3.min.js
+++ b/c3.min.js
@@ -1,4 +1,4 @@
-!function(a){"use strict";function b(a){var b=this.internal=new c(this);b.loadConfig(a),b.init(),function d(a,b,c){for(var e in a)b[e]=a[e].bind(c),Object.keys(a[e]).length>0&&d(a[e],b[e],c)}(e,this,this)}function c(b){var c=this;c.d3=a.d3?a.d3:"undefined"!=typeof require?require("d3"):void 0,c.api=b,c.config=c.getDefaultConfig(),c.data={},c.cache={},c.axes={}}function d(a,b){function c(a,b){a.attr("transform",function(a){return"translate("+Math.ceil(b(a)+s)+", 0)"})}function d(a,b){a.attr("transform",function(a){return"translate(0,"+Math.ceil(b(a))+")"})}function e(a){var b=a[0],c=a[a.length-1];return c>b?[b,c]:[c,b]}function f(a){var b,c,d=[];if(a.ticks)return a.ticks.apply(a,k);for(c=a.domain(),b=Math.ceil(c[0]);b<c[1];b++)d.push(b);return d.length>0&&d[0]>0&&d.unshift(d[0]-(d[1]-d[0])),d}function g(){var a,c=m.copy();return b&&(a=m.domain(),c.domain([a[0],a[1]-1])),c}function h(a){return j?j(a):a}function i(i){i.each(function(){function i(a){var b=m(a)+s;return B[0]<b&&b<B[1]?o:0}var j,k,t=a.select(this),u=this.__chart__||m,v=this.__chart__=g(),w=r?r:f(v),x=t.selectAll(".tick").data(w,v),y=x.enter().insert("g",".domain").attr("class","tick").style("opacity",1e-6),z=x.exit().remove(),A=a.transition(x).style("opacity",1),B=m.rangeExtent?m.rangeExtent():e(m.range()),C=t.selectAll(".domain").data([0]),D=(C.enter().append("path").attr("class","domain"),a.transition(C));y.append("line"),y.append("text");var E=y.select("line"),F=A.select("line"),G=x.select("text").text(h),H=y.select("text"),I=A.select("text");switch(b?(s=Math.ceil((v(1)-v(0))/2),k=l?0:s):s=k=0,n){case"bottom":j=c,E.attr("y2",o),H.attr("y",Math.max(o,0)+q),F.attr("x1",k).attr("x2",k).attr("y2",i),I.attr("x",0).attr("y",Math.max(o,0)+q),G.attr("dy",".71em").style("text-anchor","middle"),D.attr("d","M"+B[0]+","+p+"V0H"+B[1]+"V"+p);break;case"top":j=c,E.attr("y2",-o),H.attr("y",-(Math.max(o,0)+q)),F.attr("x2",0).attr("y2",-o),I.attr("x",0).attr("y",-(Math.max(o,0)+q)),G.attr("dy","0em").style("text-anchor","middle"),D.attr("d","M"+B[0]+","+-p+"V0H"+B[1]+"V"+-p);break;case"left":j=d,E.attr("x2",-o),H.attr("x",-(Math.max(o,0)+q)),F.attr("x2",-o).attr("y2",0),I.attr("x",-(Math.max(o,0)+q)).attr("y",s),G.attr("dy",".32em").style("text-anchor","end"),D.attr("d","M"+-p+","+B[0]+"H0V"+B[1]+"H"+-p);break;case"right":j=d,E.attr("x2",o),H.attr("x",Math.max(o,0)+q),F.attr("x2",o).attr("y2",0),I.attr("x",Math.max(o,0)+q).attr("y",0),G.attr("dy",".32em").style("text-anchor","start"),D.attr("d","M"+p+","+B[0]+"H0V"+B[1]+"H"+p)}if(v.rangeBand){var J=v,K=J.rangeBand()/2;u=v=function(a){return J(a)+K}}else u.rangeBand?u=v:z.call(j,v);y.call(j,u),A.call(j,v)})}var j,k,l,m=a.scale.linear(),n="bottom",o=6,p=6,q=3,r=null,s=0,t=!0;return i.scale=function(a){return arguments.length?(m=a,i):m},i.orient=function(a){return arguments.length?(n=a in{top:1,right:1,bottom:1,left:1}?a+"":"bottom",i):n},i.tickFormat=function(a){return arguments.length?(j=a,i):j},i.tickCentered=function(a){return arguments.length?(l=a,i):l},i.tickOffset=function(){return s},i.ticks=function(){return arguments.length?(k=arguments,i):k},i.tickCulling=function(a){return arguments.length?(t=a,i):t},i.tickValues=function(a){if("function"==typeof a)r=function(){return a(m.domain())};else{if(!arguments.length)return r;r=a}return i},i}var e,f,g={version:"0.3.0"};g.generate=function(a){return new b(a)},g.chart={fn:b.prototype,internal:{fn:c.prototype}},e=g.chart.fn,f=g.chart.internal.fn,f.init=function(){var a=this,b=a.config;if(a.initParams(),b[_])a.convertUrlToData(b[_],b[db],b[eb],a.initWithData);else if(b[ab])a.initWithData(a.convertJsonToData(b[ab],b[eb]));else if(b[bb])a.initWithData(a.convertRowsToData(b[bb]));else{if(!b[cb])throw Error("url or json or rows or columns is required.");a.initWithData(a.convertColumnsToData(b[cb]))}},f.initParams=function(){var a=this,b=a.d3,c=a.config;a.clipId="c3-"+ +new Date+"-clip",a.clipIdForXAxis=a.clipId+"-xaxis",a.clipIdForYAxis=a.clipId+"-yaxis",a.clipPath=a.getClipPath(a.clipId),a.clipPathForXAxis=a.getClipPath(a.clipIdForXAxis),a.clipPathForYAxis=a.getClipPath(a.clipIdForYAxis),a.dragStart=null,a.dragging=!1,a.cancelClick=!1,a.mouseover=!1,a.transiting=!1,a.color=a.generateColor(),a.levelColor=a.generateLevelColor(),a.dataTimeFormat=c[B]?b.time.format:b.time.format.utc,a.axisTimeFormat=c[yb]?b.time.format:b.time.format.utc,a.defaultAxisTimeFormat=a.axisTimeFormat.multi([[".%L",function(a){return a.getMilliseconds()}],[":%S",function(a){return a.getSeconds()}],["%I:%M",function(a){return a.getMinutes()}],["%I %p",function(a){return a.getHours()}],["%-m/%-d",function(a){return a.getDay()&&1!==a.getDate()}],["%-m/%-d",function(a){return 1!==a.getDate()}],["%-m/%-d",function(a){return a.getMonth()}],["%Y/%-m/%-d",function(){return!0}]]),a.hiddenTargetIds=[],a.hiddenLegendIds=[],a.xOrient=c[vb]?"left":"bottom",a.yOrient=c[vb]?"bottom":"left",a.y2Orient=c[vb]?"top":"right",a.subXOrient=c[vb]?"left":"bottom",a.isLegendRight="right"===c[mb],a.isLegendInset="inset"===c[mb],a.isLegendTop="top-left"===c[nb]||"top-right"===c[nb],a.isLegendLeft="top-left"===c[nb]||"bottom-left"===c[nb],a.legendStep=0,a.legendItemWidth=0,a.legendItemHeight=0,a.legendOpacityForHidden=.15,a.currentMaxTickWidth=0,a.rotated_padding_left=30,a.rotated_padding_right=c[vb]&&!c[wb]?0:30,a.rotated_padding_top=5,a.withoutFadeIn={},a.axes.subx=b.selectAll([])},f.initWithData=function(b){var c,d=this,e=d.d3,f=d.config,g=!0;d.initPie&&d.initPie(),d.initBrush&&d.initBrush(),d.initZoom&&d.initZoom(),d.selectChart=e.select(f[h]),d.selectChart.empty()&&(d.selectChart=e.select(document.createElement("div")).style("opacity",0),d.observeInserted(d.selectChart),g=!1),d.selectChart.html("").classed("c3",!0),d.data.xs={},d.data.targets=d.convertDataToTargets(b),f[P]&&(d.data.targets=d.data.targets.filter(f[P])),f[O]&&d.addHiddenTargetIds(f[O]===!0?d.mapToIds(d.data.targets):f[O]),d.hasType("gauge")&&(f[lb]=!1),d.updateSizes(),d.updateScales(),d.x.domain(e.extent(d.getXDomain(d.data.targets))),d.y.domain(d.getYDomain(d.data.targets,"y")),d.y2.domain(d.getYDomain(d.data.targets,"y2")),d.subX.domain(d.x.domain()),d.subY.domain(d.y.domain()),d.subY2.domain(d.y2.domain()),d.orgXDomain=d.x.domain(),d.brush&&d.brush.scale(d.subX),f[o]&&d.zoom.scale(d.x),d.svg=d.selectChart.append("svg").style("overflow","hidden").on("mouseenter",function(){return f[t].call(d)}).on("mouseleave",function(){return f[u].call(d)}),d.defs=d.svg.append("defs"),d.defs.append("clipPath").attr("id",d.clipId).append("rect"),d.defs.append("clipPath").attr("id",d.clipIdForXAxis).append("rect"),d.defs.append("clipPath").attr("id",d.clipIdForYAxis).append("rect"),d.updateSvgSize(),c=d.main=d.svg.append("g").attr("transform",d.getTranslate("main")),d.initSubchart&&d.initSubchart(),d.initTooltip&&d.initTooltip(),d.initLegend&&d.initLegend(),c.append("text").attr("class",pe[Nd]+" 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e.svg&&(b=e.filterTargetsToShow(e.data.targets),"y"===a?(c=e.y.copy().domain(e.getYDomain(b,"y")),d=e.getYAxis(c,e.yOrient,f[Ub],f[Xb])):"y2"===a?(c=e.y2.copy().domain(e.getYDomain(b,"y2")),d=e.getYAxis(c,e.y2Orient,f[bc],f[ec])):(c=e.x.copy().domain(e.getXDomain(b)),d=e.getXAxis(c,e.xOrient,e.getXAxisTickFormat(),f[Gb]?f[Gb]:e.xAxis.tickValues())),e.main.append("g").call(d).each(function(){e.d3.select(this).selectAll("text").each(function(){var a=this.getBoundingClientRect();g<a.width&&(g=a.width)})}).remove()),e.currentMaxTickWidth=0>=g?e.currentMaxTickWidth:g,e.currentMaxTickWidth},f.updateAxisLabels=function(a){var b=this,c=b.main.select("."+pe[_d]+" ."+pe[ae]),d=b.main.select("."+pe[be]+" ."+pe[ce]),e=b.main.select("."+pe[de]+" 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b=this,c=b.axes;return{axisX:a?c.x.transition().duration(a):c.x,axisY:a?c.y.transition().duration(a):c.y,axisY2:a?c.y2.transition().duration(a):c.y2,axisSubX:a?c.subx.transition().duration(a):c.subx}},f.redrawAxis=function(a,b){var c=this;c.axes.x.style("opacity",b?0:1),c.axes.y.style("opacity",b?0:1),c.axes.y2.style("opacity",b?0:1),c.axes.subx.style("opacity",b?0:1),a.axisX.call(c.xAxis),a.axisY.call(c.yAxis),a.axisY2.call(c.y2Axis),a.axisSubX.call(c.subXAxis)},f.getClipPath=function(b){var c=a.navigator.appVersion.toLowerCase().indexOf("msie 9.")>=0;return"url("+(c?"":document.URL.split("#")[0])+"#"+b+")"},f.getAxisClipX=function(a){return a?-31:-(this.margin.left-1)},f.getAxisClipY=function(a){return a?-20:-4},f.getXAxisClipX=function(){var a=this;return a.getAxisClipX(!a.config[vb])},f.getXAxisClipY=function(){var a=this;return a.getAxisClipY(!a.config[vb])},f.getYAxisClipX=function(){var a=this;return a.getAxisClipX(a.config[vb])},f.getYAxisClipY=function(){var a=this;return a.getAxisClipY(a.config[vb])},f.getAxisClipWidth=function(a){var b=this;return a?b.width+2+30+30:b.margin.left+20},f.getAxisClipHeight=function(a){var b=this,c=b.config;return a?(c[Mb]?c[Mb]:0)+80:b.height+8},f.getXAxisClipWidth=function(){var a=this;return a.getAxisClipWidth(!a.config[vb])},f.getXAxisClipHeight=function(){var a=this;return a.getAxisClipHeight(!a.config[vb])},f.getYAxisClipWidth=function(){var a=this;return a.getAxisClipWidth(a.config[vb])},f.getYAxisClipHeight=function(){var a=this;return a.getAxisClipHeight(a.config[vb])},f.initPie=function(){var a=this,b=a.d3,c=a.config;a.pie=b.layout.pie().value(function(a){return a.values.reduce(function(a,b){return a+b.value},0)}),c[K]&&c[Ac]&&c[Nc]||a.pie.sort(null)},f.updateRadius=function(){var a=this,b=a.config,c=b[Ic]||b[Mc];a.radiusExpanded=Math.min(a.arcWidth,a.arcHeight)/2,a.radius=.95*a.radiusExpanded,a.innerRadiusRatio=c?(a.radius-c)/a.radius:.6,a.innerRadius=a.hasType("donut")||a.hasType("gauge")?a.radius*a.innerRadiusRatio:0},f.updateArc=function(){var a=this;a.svgArc=a.getSvgArc(),a.svgArcExpanded=a.getSvgArcExpanded(),a.svgArcExpandedSub=a.getSvgArcExpanded(.98)},f.updateAngle=function(a){var b=this,c=b.config,d=!1,e=0;if(b.pie(b.filterTargetsToShow(b.data.targets)).sort(b.descByStartAngle).forEach(function(b){d||b.data.id!==a.data.id||(d=!0,a=b,a.index=e),e++}),isNaN(a.endAngle)&&(a.endAngle=a.startAngle),b.isGaugeType(a.data)){var f=c[Fc],g=c[Gc],h=Math.abs(f)+g,i=Math.PI/h;a.startAngle=-1*(Math.PI/2)+i*Math.abs(f),a.endAngle=a.startAngle+i*(a.value>g?g:a.value)}return d?a:null},f.getSvgArc=function(){var a=this,b=a.d3.svg.arc().outerRadius(a.radius).innerRadius(a.innerRadius),c=function(c,d){var e;return d?b(c):(e=a.updateAngle(c),e?b(e):"M 0 0")};return 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f.shouldShowArcLabel()?(b=f.updateAngle(a),c=b?b.value:null,d=f.getArcRatio(b),f.hasType("gauge")||f.meetsArcLabelThreshold(d)?(e=f.getArcLabelFormat(),e?e(c,d):f.defaultArcValueFormat(c,d)):""):""},f.expandArc=function(a,b){var c=this,d=c.svg.selectAll("."+pe[gd]+c.selectorTarget(a)),e=c.svg.selectAll("."+pe[Id]).filter(function(b){return b.data.id!==a});c.shouldExpand(a)&&d.selectAll("path").transition().duration(50).attr("d",c.svgArcExpanded).transition().duration(100).attr("d",c.svgArcExpandedSub).each(function(a){c.isDonutType(a.data)}),b||e.style("opacity",.3)},f.unexpandArc=function(a){var b=this,c=b.svg.selectAll("."+pe[gd]+b.selectorTarget(a));c.selectAll("path."+pe[Id]).transition().duration(50).attr("d",b.svgArc),b.svg.selectAll("."+pe[Id]).style("opacity",1)},f.shouldExpand=function(a){var b=this,c=b.config;return b.isDonutType(a)&&c[Oc]||b.isGaugeType(a)&&c[Ec]||b.isPieType(a)&&c[Bc]},f.shouldShowArcLabel=function(){var a=this,b=a.config,c=!0;return a.hasType("donut")?c=b[Jc]:a.hasType("pie")&&(c=b[xc]),c},f.meetsArcLabelThreshold=function(a){var b=this,c=b.config,d=b.hasType("donut")?c[Lc]:c[zc];return a>=d},f.getArcLabelFormat=function(){var a=this,b=a.config,c=b[yc];return a.hasType("gauge")?c=b[Dc]:a.hasType("donut")&&(c=b[Kc]),c},f.getArcTitle=function(){var a=this;return a.hasType("donut")?a.config[Pc]:""},f.descByStartAngle=function(a,b){return a.startAngle-b.startAngle},f.updateTargetsForArc=function(a){var b,c,d=this,e=d.main,f=d.classChartArc.bind(d),g=d.classArcs.bind(d);b=e.select("."+pe[hd]).selectAll("."+pe[gd]).data(d.pie(a)).attr("class",f),c=b.enter().append("g").attr("class",f),c.append("g").attr("class",g),c.append("text").attr("dy",d.hasType("gauge")?"-0.35em":".35em").style("opacity",0).style("text-anchor","middle").style("pointer-events","none")},f.initArc=function(){var a=this;a.arcs=a.main.select("."+pe[_c]).append("g").attr("class",pe[hd]).attr("transform",a.getTranslate("arc")),a.arcs.append("text").attr("class",pe[id]).style("text-anchor","middle").text(a.getArcTitle())},f.redrawArc=function(a,b,c){var d,e=this,f=e.d3,g=e.config,h=e.main;d=h.selectAll("."+pe[Jd]).selectAll("."+pe[Id]).data(e.arcData.bind(e)),d.enter().append("path").attr("class",e.classArc.bind(e)).style("fill",function(a){return e.color(a.data)}).style("cursor",function(a){return g[S](a)?"pointer":null}).style("opacity",0).each(function(a){e.isGaugeType(a.data)&&(a.startAngle=a.endAngle=-1*(Math.PI/2)),this._current=a}).on("mouseover",function(a){var b,c;e.transiting||(b=e.updateAngle(a),c=e.convertToArcData(b),e.expandArc(b.data.id),e.toggleFocusLegend(b.data.id,!0),e.config[V](c,this))}).on("mousemove",function(a){var b=e.updateAngle(a),c=e.convertToArcData(b),d=[c];e.showTooltip(d,f.mouse(this))}).on("mouseout",function(a){var b,c;e.transiting||(b=e.updateAngle(a),c=e.convertToArcData(b),e.unexpandArc(b.data.id),e.revertLegend(),e.hideTooltip(),e.config[W](c,this))}).on("click",function(a,b){var c,d;e.toggleShape&&(c=e.updateAngle(a),d=e.convertToArcData(c),e.toggleShape(this,d,b))}),d.attr("transform",function(a){return!e.isGaugeType(a.data)&&c?"scale(0)":""}).style("opacity",function(a){return a===this._current?0:1}).each(function(){e.transiting=!0}).transition().duration(a).attrTween("d",function(a){var b,c=e.updateAngle(a);return c?(isNaN(this._current.endAngle)&&(this._current.endAngle=this._current.startAngle),b=f.interpolate(this._current,c),this._current=b(0),function(a){return e.getArc(b(a),!0)}):function(){return"M 0 0"}}).attr("transform",c?"scale(1)":"").style("fill",function(a){return 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h,i,j,k,l,m,n=this,o=n.d3,p=n.context,q=n.config,r=n.barData.bind(n),s=n.lineData.bind(n),t=n.classBar.bind(n),u=n.classLine.bind(n),v=n.classArea.bind(n),w=n.initialOpacity.bind(n);q[gb]&&(o.event&&"zoom"===o.event.type&&n.brush.extent(n.x.orgDomain()).update(),a&&(!q[vb]&&q[Hb]&&n.rotateTickText(n.axes.subx,b.axisSubX,q[Hb]),n.brush.empty()||n.brush.extent(n.x.orgDomain()).update(),k=n.generateDrawArea(e,!0),l=n.generateDrawBar(f,!0),m=n.generateDrawLine(g,!0),j=p.selectAll("."+pe[Fd]).selectAll("."+pe[Ed]).data(r),j.enter().append("path").attr("class",t).style("stroke","none").style("fill",n.color),j.style("opacity",w).transition().duration(c).attr("d",l).style("opacity",1),j.exit().transition().duration(c).style("opacity",0).remove(),h=p.selectAll("."+pe[Dd]).selectAll("."+pe[Cd]).data(s),h.enter().append("path").attr("class",u).style("stroke",n.color),h.style("opacity",w).transition().duration(c).attr("d",m).style("opacity",1),h.exit().transition().duration(c).style("opacity",0).remove(),i=p.selectAll("."+pe[Ld]).selectAll("."+pe[Kd]).data(s),i.enter().append("path").attr("class",v).style("fill",n.color).style("opacity",function(){return n.orgAreaOpacity=+o.select(this).style("opacity"),0}),i.style("opacity",0).transition().duration(c).attr("d",k).style("fill",n.color).style("opacity",n.orgAreaOpacity),i.exit().transition().duration(d).style("opacity",0).remove()))},f.redrawForBrush=function(){var a=this,b=a.x;a.redraw({withTransition:!1,withY:!1,withSubchart:!1,withUpdateXDomain:!0}),a.config[ib].call(a.api,b.orgDomain())},f.transformContext=function(a,b){var c,d=this;b&&b.axisSubX?c=b.axisSubX:(c=d.context.select("."+pe[_d]),a&&(c=c.transition())),d.context.attr("transform",d.getTranslate("context")),c.attr("transform",d.getTranslate("subx"))},f.initZoom=function(){var a=this,b=a.d3,c=a.config;a.zoom=b.behavior.zoom().on("zoomstart",function(){a.zoom.altDomain=b.event.sourceEvent.altKey?a.x.orgDomain():null}).on("zoom",function(){a.redrawForZoom.call(a)}),a.zoom.scale=function(a){return c[vb]?this.y(a):this.x(a)},a.zoom.orgScaleExtent=function(){var b=c[p]?c[p]:[1,10];return[b[0],Math.max(a.getMaxDataCount()/b[1],b[1])]},a.zoom.updateScaleExtent=function(){var b=xe(a.x.orgDomain())/xe(a.orgXDomain),c=this.orgScaleExtent();return this.scaleExtent([c[0]*b,c[1]*b]),this}},f.updateZoom=function(){var a=this,b=a.config[o]?a.zoom:function(){};a.main.select("."+a.CLASS[td]).call(b),a.main.selectAll("."+a.CLASS[pd]).call(b)},f.redrawForZoom=function(){var a=this,b=a.d3,c=a.config,d=a.zoom,e=a.x,f=a.orgXDomain;if(c[o]&&0!==a.filterTargetsToShow(a.data.targets).length){if("mousemove"===b.event.sourceEvent.type&&d.altDomain)return e.domain(d.altDomain),void d.scale(e).updateScaleExtent();a.isCategorized()&&e.orgDomain()[0]===f[0]&&e.domain([f[0]-1e-10,e.orgDomain()[1]]),a.redraw({withTransition:!1,withY:!1,withSubchart:!1}),"mousemove"===b.event.sourceEvent.type&&(a.cancelClick=!0),c[r].call(a.api,e.orgDomain())
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d(a)},f.defaultValueFormat=function(a){return qe(a)?+a:""},f.defaultArcValueFormat=function(a,b){return(100*b).toFixed(1)+"%"},f.formatByAxisId=function(a){var b=this,c=b.config[J],d=function(a){return qe(a)?+a:""};return c.format?d=c.format:"object"==typeof c.format&&c.format[a]&&(d=c.format[a]),d},f.hasCaches=function(a){for(var b=0;b<a.length;b++)if(!(a[b]in this.cache))return!1;return!0},f.addCache=function(a,b){this.cache[a]=this.cloneTarget(b)},f.getCaches=function(a){var b,c=[];for(b=0;b<a.length;b++)a[b]in this.cache&&c.push(this.cloneTarget(this.cache[a[b]]));return c};var $c="target",_c="chart 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e=d.axis_rotated?e.x(i).y(h):e.x(h).y(i),d.line_connect_null||(e=e.defined(function(a){return null!=a.value})),function(a){var f,h=d.line_connect_null?c.filterRemoveNull(a.values):a.values,i=b?c.x:c.subX,j=g.call(c,a.id),k=0,l=0;return c.isLineType(a)?f=d.data_regions[a.id]?c.lineWithRegions(h,i,j,d.data_regions[a.id]):e.interpolate(c.getInterpolate(a))(h):(h[0]&&(k=i(h[0].x),l=j(h[0].value)),f=d.axis_rotated?"M "+l+" "+k:"M "+k+" "+l),f?f:"M 0 0"}},f.generateGetLinePoint=function(a,b){var c=this,d=c.config,e=a.__max__+1,f=c.getShapeX(0,e,a,!!b),g=c.getShapeY(!!b),h=c.getShapeOffset(c.isLineType,a,!!b),i=b?c.getSubYScale:c.getYScale;return function(a,b){var e=i.call(c,a.id)(0),j=h(a,b)||e,k=f(a),l=g(a);return d.axis_rotated&&(0<a.value&&e>l||a.value<0&&l>e)&&(l=e),[[k,l-(e-j)]]}},f.lineWithRegions=function(a,b,c,d){function e(a,b){var c;for(c=0;c<b.length;c++)if(b[c].start<a&&a<=b[c].end)return!0;return!1}var f,g,h,i,j,k,l,m,n,o,p,q,r=this,s=r.config,t=-1,u="M",v=[];if(Db(d))for(f=0;f<d.length;f++)v[f]={},v[f].start=Cb(d[f].start)?a[0].x:r.isTimeSeries()?r.parseDate(d[f].start):d[f].start,v[f].end=Cb(d[f].end)?a[a.length-1].x:r.isTimeSeries()?r.parseDate(d[f].end):d[f].end;for(p=s.axis_rotated?function(a){return c(a.value)}:function(a){return b(a.x)},q=s.axis_rotated?function(a){return b(a.x)}:function(a){return c(a.value)},h=r.isTimeSeries()?function(a,d,e,f){var g=a.x.getTime(),h=d.x-a.x,i=new Date(g+h*e),k=new Date(g+h*(e+f));return"M"+b(i)+" "+c(j(e))+" "+b(k)+" "+c(j(e+f))}:function(a,d,e,f){return"M"+b(i(e),!0)+" "+c(j(e))+" "+b(i(e+f),!0)+" "+c(j(e+f))},f=0;f<a.length;f++){if(Cb(v)||!e(a[f].x,v))u+=" "+p(a[f])+" "+q(a[f]);else for(i=r.getScale(a[f-1].x,a[f].x,r.isTimeSeries()),j=r.getScale(a[f-1].value,a[f].value),k=b(a[f].x)-b(a[f-1].x),l=c(a[f].value)-c(a[f-1].value),m=Math.sqrt(Math.pow(k,2)+Math.pow(l,2)),n=2/m,o=2*n,g=n;1>=g;g+=o)u+=h(a[f-1],a[f],g,n);t=a[f].x}return u},f.redrawArea=function(a){var b=this,c=b.CLASS,d=b.d3;b.mainArea=b.main.selectAll("."+c[U]).selectAll("."+c[T]).data(b.lineData.bind(b)),b.mainArea.enter().append("path").attr("class",b.classArea.bind(b)).style("fill",b.color).style("opacity",function(){return b.orgAreaOpacity=+d.select(this).style("opacity"),0}),b.mainArea.style("opacity",b.orgAreaOpacity),b.mainArea.exit().transition().duration(a).style("opacity",0).remove()},f.addTransitionForArea=function(a,b){var c=this;a.push(c.mainArea.transition().attr("d",b).style("fill",c.color).style("opacity",c.orgAreaOpacity))},f.generateDrawArea=function(a,b){var c=this,d=c.config,e=c.d3.svg.area(),f=c.generateGetAreaPoint(a,b),g=b?c.getSubYScale:c.getYScale,h=function(a){return(b?c.subxx:c.xx).call(c,a)},i=function(a,b){return d.data_groups.length>0?f(a,b)[0][1]:g.call(c,a.id)(0)},j=function(a,b){return d.data_groups.length>0?f(a,b)[1][1]:g.call(c,a.id)(a.value)};return e=d.axis_rotated?e.x0(i).x1(j).y(h):e.x(h).y0(i).y1(j),d.line_connect_null||(e=e.defined(function(a){return null!==a.value})),function(a){var b,f=d.line_connect_null?c.filterRemoveNull(a.values):a.values,g=0,h=0;return c.isAreaType(a)?b=e.interpolate(c.getInterpolate(a))(f):(f[0]&&(g=c.x(f[0].x),h=c.getYScale(a.id)(f[0].value)),b=d.axis_rotated?"M "+h+" "+g:"M "+g+" "+h),b?b:"M 0 0"}},f.generateGetAreaPoint=function(a,b){var c=this,d=c.config,e=a.__max__+1,f=c.getShapeX(0,e,a,!!b),g=c.getShapeY(!!b),h=c.getShapeOffset(c.isAreaType,a,!!b),i=b?c.getSubYScale:c.getYScale;return function(a,b){var e=i.call(c,a.id)(0),j=h(a,b)||e,k=f(a),l=g(a);return d.axis_rotated&&(0<a.value&&e>l||a.value<0&&l>e)&&(l=e),[[k,j],[k,l-(e-j)]]}},f.redrawCircle=function(){var a=this,b=a.CLASS;a.mainCircle=a.main.selectAll("."+b[Q]).selectAll("."+b[P]).data(a.lineOrScatterData.bind(a)),a.mainCircle.enter().append("circle").attr("class",a.classCircle.bind(a)).attr("r",a.pointR.bind(a)).style("fill",a.color),a.mainCircle.style("opacity",a.initialOpacity.bind(a)),a.mainCircle.exit().remove()},f.addTransitionForCircle=function(a,b,c){var d=this;a.push(d.mainCircle.transition().style("opacity",d.opacityForCircle.bind(d)).style("fill",d.color).attr("cx",b).attr("cy",c)),a.push(d.main.selectAll("."+yb[w]).transition().attr("cx",b).attr("cy",c))},f.circleX=function(a){return a.x||0===a.x?this.x(a.x):null},f.circleY=function(a,b){var c=this,d=c.getShapeIndices(c.isLineType),e=c.generateGetLinePoint(d);return c.config.data_groups.length>0?e(a,b)[0][1]:c.getYScale(a.id)(a.value)},f.getCircles=function(a,b){var c=this;return(b?c.main.selectAll("."+yb[Q]+c.getTargetSelectorSuffix(b)):c.main).selectAll("."+yb[P]+(zb(a)?"-"+a:""))},f.expandCircles=function(a,b){var c=this,d=c.pointExpandedR.bind(c);c.getCircles(a,b).classed(yb[vb],!0).attr("r",d)},f.unexpandCircles=function(a){var b=this,c=b.pointR.bind(b);b.getCircles(a).filter(function(){return b.d3.select(this).classed(yb[vb])}).classed(yb[vb],!1).attr("r",c)},f.pointR=function(a){var b=this,c=b.config;return c.point_show&&!b.isStepType(a)?Ab(c.point_r)?c.point_r(a):c.point_r:0},f.pointExpandedR=function(a){var b=this,c=b.config;return c.point_focus_expand_enabled?c.point_focus_expand_r?c.point_focus_expand_r:1.75*b.pointR(a):b.pointR(a)},f.pointSelectR=function(a){var b=this,c=b.config;return c.point_select_r?c.point_select_r:4*b.pointR(a)},f.isWithinCircle=function(a,b){var c=this.d3,d=c.mouse(a),e=c.select(a),f=1*e.attr("cx"),g=1*e.attr("cy");return Math.sqrt(Math.pow(f-d[0],2)+Math.pow(g-d[1],2))<b},f.initBar=function(){var a=this,b=a.CLASS;a.main.select("."+b[i]).append("g").attr("class",b[m])},f.updateTargetsForBar=function(a){var b,c,d=this,e=d.config,f=d.CLASS,g=d.classChartBar.bind(d),h=d.classBars.bind(d);b=d.main.select("."+f[m]).selectAll("."+f[l]).data(a).attr("class",g),c=b.enter().append("g").attr("class",g).style("opacity",0).style("pointer-events","none"),c.append("g").attr("class",h).style("cursor",function(a){return e.data_selection_isselectable(a)?"pointer":null})},f.redrawBar=function(a){var b=this,c=b.CLASS,d=b.barData.bind(b),e=b.classBar.bind(b),f=b.initialOpacity.bind(b),g=function(a){return b.color(a.id)};b.mainBar=b.main.selectAll("."+c[O]).selectAll("."+c[N]).data(d),b.mainBar.enter().append("path").attr("class",e).style("stroke",g).style("fill",g),b.mainBar.style("opacity",f),b.mainBar.exit().transition().duration(a).style("opacity",0).remove()},f.addTransitionForBar=function(a,b){var c=this;a.push(c.mainBar.transition().attr("d",b).style("fill",c.color).style("opacity",1))},f.getBarW=function(a,b){var c=this,d=c.config,e="number"==typeof d.bar_width?d.bar_width:b?2*a.tickOffset()*d.bar_width_ratio/b:0;return d.bar_width_max&&e>d.bar_width_max?d.bar_width_max:e},f.getBars=function(a){var b=this;return b.main.selectAll("."+yb[N]+(zb(a)?"-"+a:""))},f.expandBars=function(a){var b=this;b.getBars(a).classed(yb[vb],!0)},f.unexpandBars=function(a){var b=this;b.getBars(a).classed(yb[vb],!1)},f.generateDrawBar=function(a,b){var c=this,d=c.config,e=c.generateGetBarPoints(a,b);return function(a,b){var c=e(a,b),f=d.axis_rotated?1:0,g=d.axis_rotated?0:1,h="M "+c[0][f]+","+c[0][g]+" L"+c[1][f]+","+c[1][g]+" L"+c[2][f]+","+c[2][g]+" L"+c[3][f]+","+c[3][g]+" z";return h}},f.generateGetBarPoints=function(a,b){var c=this,d=a.__max__+1,e=c.getBarW(c.xAxis,d),f=c.getShapeX(e,d,a,!!b),g=c.getShapeY(!!b),h=c.getShapeOffset(c.isBarType,a,!!b),i=b?c.getSubYScale:c.getYScale;return function(a,b){var d=i.call(c,a.id)(0),j=h(a,b)||d,k=f(a),l=g(a);return c.config.axis_rotated&&(0<a.value&&d>l||a.value<0&&l>d)&&(l=d),[[k,j],[k,l-(d-j)],[k+e,l-(d-j)],[k+e,j]]}},f.isWithinBar=function(a){var b=this.d3,c=b.mouse(a),d=a.getBoundingClientRect(),e=a.pathSegList.getItem(0),f=a.pathSegList.getItem(1),g=e.x,h=Math.min(e.y,f.y),i=d.width,j=d.height,k=2,l=g-k,m=g+i+k,n=h+j+k,o=h-k;return l<c[0]&&c[0]<m&&o<c[1]&&c[1]<n},f.initText=function(){var a=this,b=a.CLASS;a.main.select("."+b[i]).append("g").attr("class",b[o]),a.mainText=a.d3.selectAll([])},f.updateTargetsForText=function(a){var b,c,d=this,e=d.CLASS,f=d.classChartText.bind(d),g=d.classTexts.bind(d);b=d.main.select("."+e[o]).selectAll("."+e[n]).data(a).attr("class",f),c=b.enter().append("g").attr("class",f).style("opacity",0).style("pointer-events","none"),c.append("g").attr("class",g)},f.redrawText=function(a){var b=this,c=b.config,d=b.CLASS,e=b.barOrLineData.bind(b),f=b.classText.bind(b);b.mainText=b.main.selectAll("."+d[X]).selectAll("."+d[W]).data(e),b.mainText.enter().append("text").attr("class",f).attr("text-anchor",function(a){return c.axis_rotated?a.value<0?"end":"start":"middle"}).style("stroke","none").style("fill",function(a){return b.color(a)}).style("fill-opacity",0),b.mainText.text(function(a){return b.formatByAxisId(b.getAxisId(a.id))(a.value,a.id)}),b.mainText.exit().transition().duration(a).style("fill-opacity",0).remove()},f.addTransitionForText=function(a,b,c,d){var e=this,f=d?0:e.opacityForText.bind(e);a.push(e.mainText.transition().attr("x",b).attr("y",c).style("fill",e.color).style("fill-opacity",f))},f.getTextRect=function(a,b){var c;return this.d3.select("body").selectAll(".dummy").data([a]).enter().append("text").classed(b?b:"",!0).text(a).each(function(){c=this.getBoundingClientRect()}).remove(),c},f.generateXYForText=function(a,b){var c=this,d=c.generateGetBarPoints(a,!1),e=b?c.getXForText:c.getYForText;return function(a,b){return e.call(c,d(a,b),a,this)}},f.getXForText=function(a,b,c){var d,e,f=this,g=c.getBoundingClientRect();return f.config.axis_rotated?(e=f.isBarType(b)?4:6,d=a[2][1]+e*(b.value<0?-1:1)):d=f.hasType("bar")?(a[2][0]+a[0][0])/2:a[0][0],d>f.width?f.width-g.width:d},f.getYForText=function(a,b,c){var d,e=this,f=c.getBoundingClientRect();return d=e.config.axis_rotated?(a[0][0]+a[2][0]+.6*f.height)/2:a[2][1]+(b.value<0?f.height:e.isBarType(b)?-3:-6),d<f.height?f.height:d},f.setTargetType=function(a,b){var c=this,d=c.config;c.mapToTargetIds(a).forEach(function(a){c.withoutFadeIn[a]=b===d.data_types[a],d.data_types[a]=b}),a||(d.data_type=b)},f.hasType=function(a,b){var c=this,d=c.config.data_types,e=!1;return(b||c.data.targets).forEach(function(b){(d[b.id]&&d[b.id].indexOf(a)>=0||!(b.id in d)&&"line"===a)&&(e=!0)}),e},f.hasArcType=function(a){return this.hasType("pie",a)||this.hasType("donut",a)||this.hasType("gauge",a)},f.isLineType=function(a){var b=this.config,c=Bb(a)?a:a.id;return!b.data_types[c]||["line","spline","area","area-spline","step","area-step"].indexOf(b.data_types[c])>=0},f.isStepType=function(a){var b=Bb(a)?a:a.id;return["step","area-step"].indexOf(this.config.data_types[b])>=0},f.isSplineType=function(a){var b=Bb(a)?a:a.id;return["spline","area-spline"].indexOf(this.config.data_types[b])>=0},f.isAreaType=function(a){var b=Bb(a)?a:a.id;return["area","area-spline","area-step"].indexOf(this.config.data_types[b])>=0},f.isBarType=function(a){var b=Bb(a)?a:a.id;return"bar"===this.config.data_types[b]},f.isScatterType=function(a){var b=Bb(a)?a:a.id;return"scatter"===this.config.data_types[b]},f.isPieType=function(a){var b=Bb(a)?a:a.id;return"pie"===this.config.data_types[b]},f.isGaugeType=function(a){var b=Bb(a)?a:a.id;return"gauge"===this.config.data_types[b]},f.isDonutType=function(a){var b=Bb(a)?a:a.id;return"donut"===this.config.data_types[b]},f.isArcType=function(a){return this.isPieType(a)||this.isDonutType(a)||this.isGaugeType(a)},f.lineData=function(a){return this.isLineType(a)?[a]:[]},f.arcData=function(a){return this.isArcType(a.data)?[a]:[]},f.barData=function(a){return this.isBarType(a)?a.values:[]},f.lineOrScatterData=function(a){return this.isLineType(a)||this.isScatterType(a)?a.values:[]},f.barOrLineData=function(a){return this.isBarType(a)||this.isLineType(a)?a.values:[]},f.initGrid=function(){var a=this,b=a.config,c=a.CLASS,d=a.d3;a.grid=a.main.append("g").attr("clip-path",a.clipPath).attr("class",c[Z]),b.grid_x_show&&a.grid.append("g").attr("class",c[_]),b.grid_y_show&&a.grid.append("g").attr("class",c[eb]),a.grid.append("g").attr("class",c[bb]),a.grid.append("g").attr("class",c[gb]),b.grid_focus_show&&a.grid.append("g").attr("class",c[cb]).append("line").attr("class",c[cb]),a.xgrid=d.selectAll([]),a.xgridLines=d.selectAll([])},f.updateXGrid=function(a){var b=this,c=b.config,d=b.CLASS,e=b.d3,f=b.generateGridData(c.grid_x_type,b.x),g=b.isCategorized()?b.xAxis.tickOffset():0;b.xgridAttr=c.axis_rotated?{x1:0,x2:b.width,y1:function(a){return b.x(a)-g},y2:function(a){return b.x(a)-g}}:{x1:function(a){return b.x(a)+g},x2:function(a){return b.x(a)+g},y1:0,y2:b.height},b.xgrid=b.main.select("."+d[_]).selectAll("."+d[$]).data(f),b.xgrid.enter().append("line").attr("class",d[$]),a||b.xgrid.attr(b.xgridAttr).style("opacity",function(){return+e.select(this).attr(c.axis_rotated?"y1":"x1")===(c.axis_rotated?b.height:0)?0:1}),b.xgrid.exit().remove()},f.updateYGrid=function(){var a=this,b=a.config,c=a.CLASS;a.ygrid=a.main.select("."+c[eb]).selectAll("."+c[db]).data(a.y.ticks(b.grid_y_ticks)),a.ygrid.enter().append("line").attr("class",c[db]),a.ygrid.attr("x1",b.axis_rotated?a.y:0).attr("x2",b.axis_rotated?a.y:a.width).attr("y1",b.axis_rotated?0:a.y).attr("y2",b.axis_rotated?a.height:a.y),a.ygrid.exit().remove(),a.smoothLines(a.ygrid,"grid")},f.redrawGrid=function(a,b){var c,d,e,f=this,g=f.main,h=f.config,i=f.CLASS;g.select("line."+i[cb]).style("visibility","hidden"),h.grid_x_show&&f.updateXGrid(),f.xgridLines=g.select("."+i[bb]).selectAll("."+i[ab]).data(h.grid_x_lines),c=f.xgridLines.enter().append("g").attr("class",function(a){return i[ab]+(a.class?" "+a.class:"")}),c.append("line").style("opacity",0),c.append("text").attr("text-anchor","end").attr("transform",h.axis_rotated?"":"rotate(-90)").attr("dx",h.axis_rotated?0:-f.margin.top).attr("dy",-5).style("opacity",0),f.xgridLines.exit().transition().duration(a).style("opacity",0).remove(),b&&h.grid_y_show&&f.updateYGrid(),b&&(f.ygridLines=g.select("."+i[gb]).selectAll("."+i[fb]).data(h.grid_y_lines),d=f.ygridLines.enter().append("g").attr("class",function(a){return i[fb]+(a.class?" 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+}),c}:function(){return!0}},f.removeGridLines=function(a,b){var c=this,d=c.config,e=c.getGridFilterToRemove(a),f=function(a){return!e(a)},g=b?yb[bb]:yb[gb],h=b?yb[ab]:yb.ygridLine;c.main.select("."+g).selectAll("."+h).filter(e).transition().duration(d.transition_duration).style("opacity",0).remove(),b?d.grid_x_lines=d.grid_x_lines.filter(f):d.grid_y_lines=d.grid_y_lines.filter(f)},f.initTooltip=function(){var a,b=this,c=b.config;if(b.tooltip=b.selectChart.style("position","relative").append("div").style("position","absolute").style("pointer-events","none").style("z-index","10").style("display","none"),c.tooltip_init_show){if(b.isTimeSeries()&&Bb(c.tooltip_init_x)){for(c.tooltip_init_x=b.parseDate(c.tooltip_init_x),a=0;a<b.data.targets[0].values.length&&b.data.targets[0].values[a].x-c.tooltip_init_x!==0;a++);c.tooltip_init_x=a}b.tooltip.html(c.tooltip_contents.call(b,b.data.targets.map(function(a){return 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c=this;c.legend.selectAll("."+yb[pb]).transition().duration(100).style("opacity",function(d){var e=c.d3.select(this);return a&&d!==a?b?c.opacityForUnfocusedLegend(e):c.opacityForLegend(e):b?c.opacityForLegend(e):c.opacityForUnfocusedLegend(e)})},f.revertLegend=function(){var a=this,b=a.d3;a.legend.selectAll("."+yb[pb]).transition().duration(100).style("opacity",function(){return a.opacityForLegend(b.select(this))})},f.showLegend=function(a){var b=this,c=b.config;c.legend_show||(c.legend_show=!0,b.legend.style("visibility","visible")),b.removeHiddenLegendIds(a),b.legend.selectAll(b.selectorLegends(a)).style("visibility","visible").transition().style("opacity",function(){return b.opacityForLegend(b.d3.select(this))})},f.hideLegend=function(a){var b=this,c=b.config;c.legend_show&&Hb(a)&&(c.legend_show=!1,b.legend.style("visibility","hidden")),b.addHiddenLegendIds(a),b.legend.selectAll(b.selectorLegends(a)).style("opacity",0).style("visibility","hidden")},f.updateLegend=function(a,b,c){function d(b,c,d){function e(a,b){b||(f=(l-x-k)/2,w>f&&(f=(l-k)/2,x=0,D++)),C[a]=D,B[D]=q.isLegendInset?10:f,y[a]=x,x+=k}var f,g,h=q.getTextRect(b.textContent,yb[pb]),i=10*Math.ceil((h.width+t)/10),j=10*Math.ceil((h.height+s)/10),k=q.isLegendRight||q.isLegendInset?j:i,l=q.isLegendRight||q.isLegendInset?q.getLegendHeight():q.getLegendWidth();return d&&(x=0,D=0,u=0,v=0),r.legend_show&&!q.isLegendToShow(c)?void(z[c]=A[c]=C[c]=y[c]=0):(z[c]=i,A[c]=j,(!u||i>=u)&&(u=i),(!v||j>=v)&&(v=j),g=q.isLegendRight||q.isLegendInset?v:u,void(r.legend_equally?(Object.keys(z).forEach(function(a){z[a]=u}),Object.keys(A).forEach(function(a){A[a]=v}),f=(l-g*a.length)/2,w>f?(x=0,D=0,a.forEach(function(a){e(a)})):e(c,!0)):e(c)))}var 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a.config.axis_rotated?b.isInner?"-0.5em":"3em":b.isInner?"1.2em":-20-a.getMaxTickWidth("y")},f.dyForY2AxisLabel=function(){var a=this,b=a.getY2AxisLabelPosition();return a.config.axis_rotated?b.isInner?"1.2em":"-2.2em":b.isInner?"-0.5em":30+this.getMaxTickWidth("y2")},f.textAnchorForXAxisLabel=function(){var a=this;return a.textAnchorForAxisLabel(!a.config.axis_rotated,a.getXAxisLabelPosition())},f.textAnchorForYAxisLabel=function(){var a=this;return a.textAnchorForAxisLabel(a.config.axis_rotated,a.getYAxisLabelPosition())},f.textAnchorForY2AxisLabel=function(){var a=this;return a.textAnchorForAxisLabel(a.config.axis_rotated,a.getY2AxisLabelPosition())},f.xForRotatedTickText=function(a){return 10*Math.sin(Math.PI*(a/180))},f.yForRotatedTickText=function(a){return 11.5-2.5*(a/15)},f.rotateTickText=function(a,b,c){a.selectAll(".tick text").style("text-anchor","start"),b.selectAll(".tick 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a-b})),k},f.generateAxisTransitions=function(a){var b=this,c=b.axes;return{axisX:a?c.x.transition().duration(a):c.x,axisY:a?c.y.transition().duration(a):c.y,axisY2:a?c.y2.transition().duration(a):c.y2,axisSubX:a?c.subx.transition().duration(a):c.subx}},f.redrawAxis=function(a,b){var c=this;c.axes.x.style("opacity",b?0:1),c.axes.y.style("opacity",b?0:1),c.axes.y2.style("opacity",b?0:1),c.axes.subx.style("opacity",b?0:1),a.axisX.call(c.xAxis),a.axisY.call(c.yAxis),a.axisY2.call(c.y2Axis),a.axisSubX.call(c.subXAxis)},f.getClipPath=function(b){var c=a.navigator.appVersion.toLowerCase().indexOf("msie 9.")>=0;return"url("+(c?"":document.URL.split("#")[0])+"#"+b+")"},f.getAxisClipX=function(a){return a?-31:-(this.margin.left-1)},f.getAxisClipY=function(a){return a?-20:-4},f.getXAxisClipX=function(){var a=this;return a.getAxisClipX(!a.config.axis_rotated)},f.getXAxisClipY=function(){var a=this;return a.getAxisClipY(!a.config.axis_rotated)},f.getYAxisClipX=function(){var a=this;return a.getAxisClipX(a.config.axis_rotated)},f.getYAxisClipY=function(){var a=this;return a.getAxisClipY(a.config.axis_rotated)},f.getAxisClipWidth=function(a){var b=this;return a?b.width+2+30+30:b.margin.left+20},f.getAxisClipHeight=function(a){var b=this,c=b.config;return a?(c.axis_x_height?c.axis_x_height:0)+80:b.height+8},f.getXAxisClipWidth=function(){var a=this;return a.getAxisClipWidth(!a.config.axis_rotated)},f.getXAxisClipHeight=function(){var a=this;return a.getAxisClipHeight(!a.config.axis_rotated)},f.getYAxisClipWidth=function(){var a=this;return a.getAxisClipWidth(a.config.axis_rotated)},f.getYAxisClipHeight=function(){var a=this;return a.getAxisClipHeight(a.config.axis_rotated)},f.initPie=function(){var a=this,b=a.d3,c=a.config;a.pie=b.layout.pie().value(function(a){return a.values.reduce(function(a,b){return a+b.value},0)}),c.data_order&&c.pie_sort&&c.donut_sort||a.pie.sort(null)},f.updateRadius=function(){var a=this,b=a.config,c=b.gauge_width||b.donut_width;a.radiusExpanded=Math.min(a.arcWidth,a.arcHeight)/2,a.radius=.95*a.radiusExpanded,a.innerRadiusRatio=c?(a.radius-c)/a.radius:.6,a.innerRadius=a.hasType("donut")||a.hasType("gauge")?a.radius*a.innerRadiusRatio:0},f.updateArc=function(){var a=this;a.svgArc=a.getSvgArc(),a.svgArcExpanded=a.getSvgArcExpanded(),a.svgArcExpandedSub=a.getSvgArcExpanded(.98)},f.updateAngle=function(a){var b=this,c=b.config,d=!1,e=0;if(b.pie(b.filterTargetsToShow(b.data.targets)).sort(b.descByStartAngle).forEach(function(b){d||b.data.id!==a.data.id||(d=!0,a=b,a.index=e),e++}),isNaN(a.endAngle)&&(a.endAngle=a.startAngle),b.isGaugeType(a.data)){var f=c.gauge_min,g=c.gauge_max,h=Math.abs(f)+g,i=Math.PI/h;a.startAngle=-1*(Math.PI/2)+i*Math.abs(f),a.endAngle=a.startAngle+i*(a.value>g?g:a.value)}return d?a:null},f.getSvgArc=function(){var a=this,b=a.d3.svg.arc().outerRadius(a.radius).innerRadius(a.innerRadius),c=function(c,d){var e;return d?b(c):(e=a.updateAngle(c),e?b(e):"M 0 0")};return c.centroid=b.centroid,c},f.getSvgArcExpanded=function(a){var b=this,c=b.d3.svg.arc().outerRadius(b.radiusExpanded*(a?a:1)).innerRadius(b.innerRadius);return function(a){var d=b.updateAngle(a);return d?c(d):"M 0 0"}},f.getArc=function(a,b,c){return c||this.isArcType(a.data)?this.svgArc(a,b):"M 0 0"},f.transformForArcLabel=function(a){var b,c,d,e,f,g=this,h=g.updateAngle(a),i="";return h&&!g.hasType("gauge")&&(b=this.svgArc.centroid(h),c=isNaN(b[0])?0:b[0],d=isNaN(b[1])?0:b[1],e=Math.sqrt(c*c+d*d),f=g.radius&&e?(36/g.radius>.375?1.175-36/g.radius:.8)*g.radius/e:0,i="translate("+c*f+","+d*f+")"),i},f.getArcRatio=function(a){var b=this,c=b.hasType("gauge")?Math.PI:2*Math.PI;return a?(a.endAngle-a.startAngle)/c:null},f.convertToArcData=function(a){return this.addName({id:a.data.id,value:a.value,ratio:this.getArcRatio(a),index:a.index})},f.textForArcLabel=function(a){var b,c,d,e,f=this;return f.shouldShowArcLabel()?(b=f.updateAngle(a),c=b?b.value:null,d=f.getArcRatio(b),f.hasType("gauge")||f.meetsArcLabelThreshold(d)?(e=f.getArcLabelFormat(),e?e(c,d):f.defaultArcValueFormat(c,d)):""):""},f.expandArc=function(a,b){var c=this,d=c.svg.selectAll("."+yb[p]+c.selectorTarget(a)),e=c.svg.selectAll("."+yb[R]).filter(function(b){return b.data.id!==a});c.shouldExpand(a)&&d.selectAll("path").transition().duration(50).attr("d",c.svgArcExpanded).transition().duration(100).attr("d",c.svgArcExpandedSub).each(function(a){c.isDonutType(a.data)}),b||e.style("opacity",.3)},f.unexpandArc=function(a){var b=this,c=b.svg.selectAll("."+yb[p]+b.selectorTarget(a));c.selectAll("path."+yb[R]).transition().duration(50).attr("d",b.svgArc),b.svg.selectAll("."+yb[R]).style("opacity",1)},f.shouldExpand=function(a){var b=this,c=b.config;return b.isDonutType(a)&&c.donut_expand||b.isGaugeType(a)&&c.gauge_expand||b.isPieType(a)&&c.pie_expand},f.shouldShowArcLabel=function(){var a=this,b=a.config,c=!0;return a.hasType("donut")?c=b.donut_label_show:a.hasType("pie")&&(c=b.pie_label_show),c},f.meetsArcLabelThreshold=function(a){var b=this,c=b.config,d=b.hasType("donut")?c.donut_label_threshold:c.pie_label_threshold;return a>=d},f.getArcLabelFormat=function(){var a=this,b=a.config,c=b.pie_label_format;return a.hasType("gauge")?c=b.gauge_label_format:a.hasType("donut")&&(c=b.donut_label_format),c},f.getArcTitle=function(){var a=this;return a.hasType("donut")?a.config.donut_title:""},f.descByStartAngle=function(a,b){return a.startAngle-b.startAngle},f.updateTargetsForArc=function(a){var b,c,d=this,e=d.main,f=d.classChartArc.bind(d),g=d.classArcs.bind(d);b=e.select("."+yb[q]).selectAll("."+yb[p]).data(d.pie(a)).attr("class",f),c=b.enter().append("g").attr("class",f),c.append("g").attr("class",g),c.append("text").attr("dy",d.hasType("gauge")?"-0.35em":".35em").style("opacity",0).style("text-anchor","middle").style("pointer-events","none")},f.initArc=function(){var a=this;a.arcs=a.main.select("."+yb[i]).append("g").attr("class",yb[q]).attr("transform",a.getTranslate("arc")),a.arcs.append("text").attr("class",yb[r]).style("text-anchor","middle").text(a.getArcTitle())},f.redrawArc=function(a,b,c){var d,e=this,f=e.d3,g=e.config,h=e.main;d=h.selectAll("."+yb[S]).selectAll("."+yb[R]).data(e.arcData.bind(e)),d.enter().append("path").attr("class",e.classArc.bind(e)).style("fill",function(a){return e.color(a.data)}).style("cursor",function(a){return g.data_selection_isselectable(a)?"pointer":null}).style("opacity",0).each(function(a){e.isGaugeType(a.data)&&(a.startAngle=a.endAngle=-1*(Math.PI/2)),this._current=a}).on("mouseover",function(a){var b,c;e.transiting||(b=e.updateAngle(a),c=e.convertToArcData(b),e.expandArc(b.data.id),e.toggleFocusLegend(b.data.id,!0),e.config.data_onmouseover(c,this))}).on("mousemove",function(a){var b=e.updateAngle(a),c=e.convertToArcData(b),d=[c];e.showTooltip(d,f.mouse(this))}).on("mouseout",function(a){var b,c;e.transiting||(b=e.updateAngle(a),c=e.convertToArcData(b),e.unexpandArc(b.data.id),e.revertLegend(),e.hideTooltip(),e.config.data_onmouseout(c,this))}).on("click",function(a,b){var c,d;e.toggleShape&&(c=e.updateAngle(a),d=e.convertToArcData(c),e.toggleShape(this,d,b))}),d.attr("transform",function(a){return!e.isGaugeType(a.data)&&c?"scale(0)":""}).style("opacity",function(a){return a===this._current?0:1}).each(function(){e.transiting=!0}).transition().duration(a).attrTween("d",function(a){var b,c=e.updateAngle(a);return c?(isNaN(this._current.endAngle)&&(this._current.endAngle=this._current.startAngle),b=f.interpolate(this._current,c),this._current=b(0),function(a){return e.getArc(b(a),!0)}):function(){return"M 0 0"}}).attr("transform",c?"scale(1)":"").style("fill",function(a){return e.levelColor?e.levelColor(a.data.values[0].value):e.color(a.data.id)}).style("opacity",1).call(e.endall,function(){e.transiting=!1}),d.exit().transition().duration(b).style("opacity",0).remove(),h.selectAll("."+yb[p]).select("text").style("opacity",0).attr("class",function(a){return e.isGaugeType(a.data)?yb[Y]:""}).text(e.textForArcLabel.bind(e)).attr("transform",e.transformForArcLabel.bind(e)).transition().duration(a).style("opacity",function(a){return e.isTargetToShow(a.data.id)&&e.isArcType(a.data)?1:0}),h.select("."+yb[r]).style("opacity",e.hasType("donut")||e.hasType("gauge")?1:0)},f.initGauge=function(){var a=this,b=a.config,c=a.arcs;a.hasType("gauge")&&(c.append("path").attr("class",yb[s]).attr("d",function(){var c={data:[{value:b.gauge_max}],startAngle:-1*(Math.PI/2),endAngle:Math.PI/2};return a.getArc(c,!0,!0)}),c.append("text").attr("dy",".75em").attr("class",yb[t]).style("text-anchor","middle").style("pointer-events","none").text(b.gauge_label_show?b.gauge_units:""),c.append("text").attr("dx",-1*(a.innerRadius+(a.radius-a.innerRadius)/2)+"px").attr("dy","1.2em").attr("class",yb[v]).style("text-anchor","middle").style("pointer-events","none").text(b.gauge_label_show?b.gauge_min:""),c.append("text").attr("dx",a.innerRadius+(a.radius-a.innerRadius)/2+"px").attr("dy","1.2em").attr("class",yb[u]).style("text-anchor","middle").style("pointer-events","none").text(b.gauge_label_show?b.gauge_max:""))},f.initRegion=function(){var a=this,b=a.CLASS;a.main.append("g").attr("clip-path",a.clipPath).attr("class",b[G])},f.redrawRegion=function(a){var b=this,c=b.config,d=b.CLASS;b.mainRegion=b.main.select("."+d[G]).selectAll("."+d[F]).data(c.regions),b.mainRegion.enter().append("g").attr("class",b.classRegion.bind(b)).append("rect").style("fill-opacity",0),b.mainRegion.exit().transition().duration(a).style("opacity",0).remove()},f.addTransitionForRegion=function(a){var b=this,c=b.regionX.bind(b),d=b.regionY.bind(b),e=b.regionWidth.bind(b),f=b.regionHeight.bind(b);a.push(b.mainRegion.selectAll("rect").transition().attr("x",c).attr("y",d).attr("width",e).attr("height",f).style("fill-opacity",function(a){return zb(a.opacity)?a.opacity:.1}))},f.regionX=function(a){var b,c=this,d=c.config,e="y"===a.axis?c.y:c.y2;return b="y"===a.axis||"y2"===a.axis?d.axis_rotated?"start"in a?e(a.start):0:0:d.axis_rotated?0:"start"in a?c.x(c.isTimeSeries()?c.parseDate(a.start):a.start):0},f.regionY=function(a){var b,c=this,d=c.config,e="y"===a.axis?c.y:c.y2;return b="y"===a.axis||"y2"===a.axis?d.axis_rotated?0:"end"in a?e(a.end):0:d.axis_rotated?"start"in a?c.x(c.isTimeSeries()?c.parseDate(a.start):a.start):0:0},f.regionWidth=function(a){var b,c=this,d=c.config,e=c.regionX(a),f="y"===a.axis?c.y:c.y2;return b="y"===a.axis||"y2"===a.axis?d.axis_rotated?"end"in a?f(a.end):c.width:c.width:d.axis_rotated?c.width:"end"in a?c.x(c.isTimeSeries()?c.parseDate(a.end):a.end):c.width,e>b?0:b-e},f.regionHeight=function(a){var b,c=this,d=c.config,e=this.regionY(a),f="y"===a.axis?c.y:c.y2;return b="y"===a.axis||"y2"===a.axis?d.axis_rotated?c.height:"start"in a?f(a.start):c.height:d.axis_rotated?"end"in a?c.x(c.isTimeSeries()?c.parseDate(a.end):a.end):c.height:c.height,e>b?0:b-e},f.isRegionOnX=function(a){return!a.axis||"x"===a.axis},f.drag=function(a){var b,c,d,e,f,g,h,i,j=this,k=j.config,l=j.main,m=j.d3;j.hasArcType()||k.data_selection_enabled&&(!k.zoom_enabled||j.zoom.altDomain)&&k.data_selection_multiple&&(b=j.dragStart[0],c=j.dragStart[1],d=a[0],e=a[1],f=Math.min(b,d),g=Math.max(b,d),h=k.data_selection_grouped?j.margin.top:Math.min(c,e),i=k.data_selection_grouped?j.height:Math.max(c,e),l.select("."+yb[ub]).attr("x",f).attr("y",h).attr("width",g-f).attr("height",i-h),l.selectAll("."+yb[K]).selectAll("."+yb[J]).filter(function(a){return k.data_selection_isselectable(a)}).each(function(a,b){var c,d,e,k,l,n,o=m.select(this),p=o.classed(yb[wb]),q=o.classed(yb[xb]),r=!1;if(o.classed(yb[P]))c=1*o.attr("cx"),d=1*o.attr("cy"),l=j.togglePoint,r=c>f&&g>c&&d>h&&i>d;else{if(!o.classed(yb[N]))return;n=Lb(this),c=n.x,d=n.y,e=n.width,k=n.height,l=j.toggleBar,r=!(c>g||f>c+e||d>i||h>d+k)}r^q&&(o.classed(yb[xb],!q),o.classed(yb[wb],!p),l.call(j,!p,o,a,b))}))},f.dragstart=function(a){var b=this,c=b.config;b.hasArcType()||c.data_selection_enabled&&(b.dragStart=a,b.main.select("."+yb[i]).append("rect").attr("class",yb[ub]).style("opacity",.1),b.dragging=!0,b.config.data_ondragstart())},f.dragend=function(){var a=this,b=a.config;a.hasArcType()||b.data_selection_enabled&&(a.main.select("."+yb[ub]).transition().duration(100).style("opacity",0).remove(),a.main.selectAll("."+yb[J]).classed(yb[xb],!1),a.dragging=!1,a.config.data_ondragend())},f.selectPoint=function(a,b,c){var d=this,e=d.config,f=(e.axis_rotated?d.circleY:d.circleX).bind(d),g=(e.axis_rotated?d.circleX:d.circleY).bind(d),h=d.pointSelectR.bind(d);e.data_onselected.call(d.api,b,a.node()),d.main.select("."+yb[x]+d.getTargetSelectorSuffix(b.id)).selectAll("."+yb[w]+"-"+c).data([b]).enter().append("circle").attr("class",function(){return d.generateClass(yb[w],c)}).attr("cx",f).attr("cy",g).attr("stroke",function(){return d.color(b)}).attr("r",function(a){return 1.4*d.pointSelectR(a)}).transition().duration(100).attr("r",h)},f.unselectPoint=function(a,b,c){var d=this;d.config.data_onunselected(b,a.node()),d.main.select("."+yb[x]+d.getTargetSelectorSuffix(b.id)).selectAll("."+yb[w]+"-"+c).transition().duration(100).attr("r",0).remove()},f.togglePoint=function(a,b,c,d){a?this.selectPoint(b,c,d):this.unselectPoint(b,c,d)},f.selectBar=function(a,b){var c=this;c.config.data_onselected.call(c,b,a.node()),a.transition().duration(100).style("fill",function(){return c.d3.rgb(c.color(b)).brighter(.75)})},f.unselectBar=function(a,b){var c=this;c.config.data_onunselected.call(c,b,a.node()),a.transition().duration(100).style("fill",function(){return c.color(b)})},f.toggleBar=function(a,b,c,d){a?this.selectBar(b,c,d):this.unselectBar(b,c,d)},f.toggleArc=function(a,b,c,d){this.toggleBar(a,b,c.data,d)},f.getToggle=function(a){var b=this;return"circle"===a.nodeName?b.togglePoint:b.d3.select(a).classed(yb[N])?b.toggleBar:b.toggleArc},f.toggleShape=function(a,b,c){var d,e,f=this,g=f.d3,h=f.config,i=g.select(a),j=i.classed(yb[wb]);"circle"===a.nodeName?(d=f.isWithinCircle(a,1.5*f.pointSelectR(b)),e=f.togglePoint):"path"===a.nodeName&&(i.classed(yb[N])?(d=f.isWithinBar(a),e=f.toggleBar):(d=!0,e=f.toggleArc)),(h.data_selection_grouped||d)&&(h.data_selection_enabled&&h.data_selection_isselectable(b)&&(h.data_selection_multiple||f.main.selectAll("."+yb[K]+(h.data_selection_grouped?f.getTargetSelectorSuffix(b.id):"")).selectAll("."+yb[J]).each(function(a,b){var c=g.select(this);c.classed(yb[wb])&&e.call(f,!1,c.classed(yb[wb],!1),a,b)}),i.classed(yb[wb],!j),e.call(f,!j,i,b,c)),f.config.data_onclick.call(f.api,b,a))},f.initBrush=function(){var a=this,b=a.d3;a.brush=b.svg.brush().on("brush",function(){a.redrawForBrush()}),a.brush.update=function(){return a.context&&a.context.select("."+a.CLASS[D]).call(this),this},a.brush.scale=function(b){return a.config.axis_rotated?this.y(b):this.x(b)}},f.initSubchart=function(){var a=this,b=a.config,c=a.context=a.svg.append("g").attr("transform",a.getTranslate("context"));b.subchart_show||c.style("visibility","hidden"),c.append("g").attr("clip-path",a.clipPath).attr("class",yb[i]),c.select("."+yb[i]).append("g").attr("class",yb[m]),c.select("."+yb[i]).append("g").attr("class",yb[k]),c.append("g").attr("clip-path",a.clipPath).attr("class",yb[D]).call(a.brush).selectAll("rect").attr(b.axis_rotated?"width":"height",b.axis_rotated?a.width2:a.height2),a.axes.subx=c.append("g").attr("class",yb[ib]).attr("transform",a.getTranslate("subx")).attr("clip-path",b.axis_rotated?"":a.clipPathForXAxis)},f.updateTargetsForSubchart=function(a){var b,c,d,e,f=this,g=f.context,h=f.config,i=f.classChartBar.bind(f),n=f.classBars.bind(f),o=f.classChartLine.bind(f),p=f.classLines.bind(f),q=f.classAreas.bind(f);
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h,i,j,k,l,m,n=this,o=n.d3,p=n.context,q=n.config,r=n.barData.bind(n),s=n.lineData.bind(n),t=n.classBar.bind(n),u=n.classLine.bind(n),v=n.classArea.bind(n),w=n.initialOpacity.bind(n);q.subchart_show&&(o.event&&"zoom"===o.event.type&&n.brush.extent(n.x.orgDomain()).update(),a&&(!q.axis_rotated&&q.axis_x_tick_rotate&&n.rotateTickText(n.axes.subx,b.axisSubX,q.axis_x_tick_rotate),n.brush.empty()||n.brush.extent(n.x.orgDomain()).update(),k=n.generateDrawArea(e,!0),l=n.generateDrawBar(f,!0),m=n.generateDrawLine(g,!0),j=p.selectAll("."+yb[O]).selectAll("."+yb[N]).data(r),j.enter().append("path").attr("class",t).style("stroke","none").style("fill",n.color),j.style("opacity",w).transition().duration(c).attr("d",l).style("opacity",1),j.exit().transition().duration(c).style("opacity",0).remove(),h=p.selectAll("."+yb[M]).selectAll("."+yb[L]).data(s),h.enter().append("path").attr("class",u).style("stroke",n.color),h.style("opacity",w).transition().duration(c).attr("d",m).style("opacity",1),h.exit().transition().duration(c).style("opacity",0).remove(),i=p.selectAll("."+yb[U]).selectAll("."+yb[T]).data(s),i.enter().append("path").attr("class",v).style("fill",n.color).style("opacity",function(){return n.orgAreaOpacity=+o.select(this).style("opacity"),0}),i.style("opacity",0).transition().duration(c).attr("d",k).style("fill",n.color).style("opacity",n.orgAreaOpacity),i.exit().transition().duration(d).style("opacity",0).remove()))},f.redrawForBrush=function(){var a=this,b=a.x;a.redraw({withTransition:!1,withY:!1,withSubchart:!1,withUpdateXDomain:!0}),a.config.subchart_onbrush.call(a.api,b.orgDomain())},f.transformContext=function(a,b){var c,d=this;b&&b.axisSubX?c=b.axisSubX:(c=d.context.select("."+yb[ib]),a&&(c=c.transition())),d.context.attr("transform",d.getTranslate("context")),c.attr("transform",d.getTranslate("subx"))},f.initZoom=function(){var a=this,b=a.d3,c=a.config;a.zoom=b.behavior.zoom().on("zoomstart",function(){a.zoom.altDomain=b.event.sourceEvent.altKey?a.x.orgDomain():null}).on("zoom",function(){a.redrawForZoom.call(a)}),a.zoom.scale=function(a){return c.axis_rotated?this.y(a):this.x(a)},a.zoom.orgScaleExtent=function(){var b=c.zoom_extent?c.zoom_extent:[1,10];return[b[0],Math.max(a.getMaxDataCount()/b[1],b[1])]},a.zoom.updateScaleExtent=function(){var b=Gb(a.x.orgDomain())/Gb(a.orgXDomain),c=this.orgScaleExtent();return this.scaleExtent([c[0]*b,c[1]*b]),this}},f.updateZoom=function(){var a=this,b=a.config.zoom_enabled?a.zoom:function(){};a.main.select("."+a.CLASS[C]).call(b),a.main.selectAll("."+a.CLASS[y]).call(b)},f.redrawForZoom=function(){var a=this,b=a.d3,c=a.config,d=a.zoom,e=a.x,f=a.orgXDomain;if(c.zoom_enabled&&0!==a.filterTargetsToShow(a.data.targets).length){if("mousemove"===b.event.sourceEvent.type&&d.altDomain)return e.domain(d.altDomain),void d.scale(e).updateScaleExtent();a.isCategorized()&&e.orgDomain()[0]===f[0]&&e.domain([f[0]-1e-10,e.orgDomain()[1]]),a.redraw({withTransition:!1,withY:!1,withSubchart:!1}),"mousemove"===b.event.sourceEvent.type&&(a.cancelClick=!0),c.zoom_onzoom.call(a.api,e.orgDomain())}},f.generateColor=function(){var a=this,b=a.config,c=a.d3,d=b.data_colors,e=Ib(b.color_pattern)?b.color_pattern:c.scale.category10().range(),f=b.data_color,g=[];return function(a){var b,c=a.id||a;return d[c]instanceof Function?b=d[c](a):d[c]?b=d[c]:(g.indexOf(c)<0&&g.push(c),b=e[g.indexOf(c)%e.length],d[c]=b),f instanceof Function?f(b,a):b}},f.generateLevelColor=function(){var a=this,b=a.config,c=b.color_pattern,d=b.color_threshold,e="value"===d.unit,f=d.values&&d.values.length?d.values:[],g=d.max||100;return Ib(b.color_threshold)?function(a){var b,d,h=c[c.length-1];for(b=0;b<f.length;b++)if(d=e?a:100*a/g,d<f[b]){h=c[b];break}return h}:null},f.getYFormat=function(a){var b=this,c=a&&!b.hasType("gauge")?b.defaultArcValueFormat:b.yFormat,d=a&&!b.hasType("gauge")?b.defaultArcValueFormat:b.y2Format;return function(a,e,f){var g="y2"===b.getAxisId(f)?d:c;return g.call(b,a,e)}},f.yFormat=function(a){var b=this,c=b.config,d=c.axis_y_tick_format?c.axis_y_tick_format:b.defaultValueFormat;return d(a)},f.y2Format=function(a){var b=this,c=b.config,d=c.axis_y2_tick_format?c.axis_y2_tick_format:b.defaultValueFormat;return d(a)},f.defaultValueFormat=function(a){return zb(a)?+a:""},f.defaultArcValueFormat=function(a,b){return(100*b).toFixed(1)+"%"},f.formatByAxisId=function(a){var b=this,c=b.config.data_labels,d=function(a){return zb(a)?+a:""};return c.format?d=c.format:"object"==typeof c.format&&c.format[a]&&(d=c.format[a]),d},f.hasCaches=function(a){for(var b=0;b<a.length;b++)if(!(a[b]in this.cache))return!1;return!0},f.addCache=function(a,b){this.cache[a]=this.cloneTarget(b)},f.getCaches=function(a){var b,c=[];for(b=0;b<a.length;b++)a[b]in this.cache&&c.push(this.cloneTarget(this.cache[a[b]]));return c};var h="target",i="chart ",j="chartLine",k="chartLines",l="chartBar",m="chartBars",n="chartText",o="chartTexts",p="chartArc",q="chartArcs",r="chartArcsTitle",s="chartArcsBackground",t="chartArcsGaugeUnit",u="chartArcsGaugeMax",v="chartArcsGaugeMin",w="selectedCircle",x="selectedCircles",y="eventRect",z="eventRects",A="eventRectsSingle",B="eventRectsMultiple",C="zoomRect",D="brush",E="focused",F="region",G="regions",H="tooltip",I="tooltipName",J="shape",K="shapes",L="line",M="lines",N="bar",O="bars",P="circle",Q="circles",R="arc",S="arcs",T="area",U="areas",V="empty",W="text",X="texts",Y="gaugeValue",Z="grid",$="xgrid",_="xgrids",ab="xgridLine",bb="xgridLines",cb="xgridFocus",db="ygrid",eb="ygrids",fb="ygridLine",gb="ygridLines",hb="axis",ib="axisX",jb="axisXLabel",kb="axisY",lb="axisYLabel",mb="axisY2",nb="axisY2Label",ob="legendBackground",pb="legendItem",qb="legendItemEvent",rb="legendItemTile",sb="legendItemHidden",tb="legendItemFocused",ub="dragarea",vb="EXPANDED",wb="SELECTED",xb="INCLUDED",yb=f.CLASS={};yb[h]="c3-target",yb[i]="c3-chart",yb[j]="c3-chart-line",yb[k]="c3-chart-lines",yb[l]="c3-chart-bar",yb[m]="c3-chart-bars",yb[n]="c3-chart-text",yb[o]="c3-chart-texts",yb[p]="c3-chart-arc",yb[q]="c3-chart-arcs",yb[r]="c3-chart-arcs-title",yb[s]="c3-chart-arcs-background",yb[t]="c3-chart-arcs-gauge-unit",yb[u]="c3-chart-arcs-gauge-max",yb[v]="c3-chart-arcs-gauge-min",yb[w]="c3-selected-circle",yb[x]="c3-selected-circles",yb[y]="c3-event-rect",yb[z]="c3-event-rects",yb[A]="c3-event-rects-single",yb[B]="c3-event-rects-multiple",yb[C]="c3-zoom-rect",yb[D]="c3-brush",yb[E]="c3-focused",yb[F]="c3-region",yb[G]="c3-regions",yb[H]="c3-tooltip",yb[I]="c3-tooltip-name",yb[J]="c3-shape",yb[K]="c3-shapes",yb[L]="c3-line",yb[M]="c3-lines",yb[N]="c3-bar",yb[O]="c3-bars",yb[P]="c3-circle",yb[Q]="c3-circles",yb[R]="c3-arc",yb[S]="c3-arcs",yb[T]="c3-area",yb[U]="c3-areas",yb[V]="c3-empty",yb[W]="c3-text",yb[X]="c3-texts",yb[Y]="c3-gauge-value",yb[Z]="c3-grid",yb[$]="c3-xgrid",yb[_]="c3-xgrids",yb[ab]="c3-xgrid-line",yb[bb]="c3-xgrid-lines",yb[cb]="c3-xgrid-focus",yb[db]="c3-ygrid",yb[eb]="c3-ygrids",yb[fb]="c3-ygrid-line",yb[gb]="c3-ygrid-lines",yb[hb]="c3-axis",yb[ib]="c3-axis-x",yb[jb]="c3-axis-x-label",yb[kb]="c3-axis-y",yb[lb]="c3-axis-y-label",yb[mb]="c3-axis-y2",yb[nb]="c3-axis-y2-label",yb[ob]="c3-legend-background",yb[pb]="c3-legend-item",yb[qb]="c3-legend-item-event",yb[rb]="c3-legend-item-tile",yb[sb]="c3-legend-item-hidden",yb[tb]="c3-legend-item-focused",yb[ub]="c3-dragarea",yb[vb]="_expanded_",yb[wb]="_selected_",yb[xb]="_included_",f.generateClass=function(a,b){return" "+a+" "+a+this.getTargetSelectorSuffix(b)},f.classText=function(a){return this.generateClass(yb[W],a.index)},f.classTexts=function(a){return this.generateClass(yb[X],a.id)},f.classShape=function(a){return this.generateClass(yb[J],a.index)},f.classShapes=function(a){return this.generateClass(yb[K],a.id)},f.classLine=function(a){return this.classShape(a)+this.generateClass(yb[L],a.id)},f.classLines=function(a){return this.classShapes(a)+this.generateClass(yb[M],a.id)},f.classCircle=function(a){return this.classShape(a)+this.generateClass(yb[P],a.index)},f.classCircles=function(a){return this.classShapes(a)+this.generateClass(yb[Q],a.id)},f.classBar=function(a){return this.classShape(a)+this.generateClass(yb[N],a.index)},f.classBars=function(a){return this.classShapes(a)+this.generateClass(yb[O],a.id)},f.classArc=function(a){return this.classShape(a.data)+this.generateClass(yb[R],a.data.id)},f.classArcs=function(a){return this.classShapes(a.data)+this.generateClass(yb[S],a.data.id)},f.classArea=function(a){return this.classShape(a)+this.generateClass(yb[T],a.id)},f.classAreas=function(a){return this.classShapes(a)+this.generateClass(yb[U],a.id)},f.classRegion=function(a,b){return this.generateClass(yb[F],b)+" "+("class"in a?a.class:"")},f.classEvent=function(a){return this.generateClass(yb[y],a.index)},f.classTarget=function(a){var b=this,c=b.config.data_classes[a],d="";return c&&(d=" "+yb[h]+"-"+c),b.generateClass(yb[h],a)+d},f.classChartText=function(a){return yb[n]+this.classTarget(a.id)},f.classChartLine=function(a){return yb[j]+this.classTarget(a.id)},f.classChartBar=function(a){return yb[l]+this.classTarget(a.id)},f.classChartArc=function(a){return yb[p]+this.classTarget(a.data.id)},f.getTargetSelectorSuffix=function(a){return a||0===a?"-"+(a.replace?a.replace(/([^a-zA-Z0-9-_])/g,"-"):a):""},f.selectorTarget=function(a){return"."+yb[h]+this.getTargetSelectorSuffix(a)},f.selectorTargets=function(a){var b=this;return a.length?a.map(function(a){return b.selectorTarget(a)}):null},f.selectorLegend=function(a){return"."+yb[pb]+this.getTargetSelectorSuffix(a)},f.selectorLegends=function(a){var b=this;return a.length?a.map(function(a){return b.selectorLegend(a)}):null};var zb=f.isValue=function(a){return a||0===a},Ab=f.isFunction=function(a){return"function"==typeof a},Bb=f.isString=function(a){return"string"==typeof a},Cb=f.isUndefined=function(a){return"undefined"==typeof a},Db=f.isDefined=function(a){return"undefined"!=typeof a},Eb=f.ceil10=function(a){return 10*Math.ceil(a/10)},Fb=f.asHalfPixel=function(a){return Math.ceil(a)+.5},Gb=f.diffDomain=function(a){return a[1]-a[0]},Hb=f.isEmpty=function(a){return!a||Bb(a)&&0===a.length||"object"==typeof a&&0===Object.keys(a).length},Ib=f.notEmpty=function(a){return Object.keys(a).length>0},Jb=f.getOption=function(a,b,c){return Db(a[b])?a[b]:c},Kb=f.hasValue=function(a,b){var c=!1;return Object.keys(a).forEach(function(d){a[d]===b&&(c=!0)}),c},Lb=f.getPathBox=function(a){var b=a.getBoundingClientRect(),c=[a.pathSegList.getItem(0),a.pathSegList.getItem(1)],d=c[0].x,e=Math.min(c[0].y,c[1].y);return{x:d,y:e,width:b.width,height:b.height}};e.focus=function(a){function b(a){c.filterTargetsToShow(a).transition().duration(100).style("opacity",1)}var c=this.internal,d=c.svg.selectAll(c.selectorTarget(a)),e=d.filter(c.isNoneArc.bind(c)),f=d.filter(c.isArc.bind(c));this.revert(),this.defocus(),b(e.classed(yb[E],!0)),b(f),c.hasArcType()&&c.expandArc(a,!0),c.toggleFocusLegend(a,!0)},e.defocus=function(a){function b(a){c.filterTargetsToShow(a).transition().duration(100).style("opacity",.3)}var c=this.internal,d=c.svg.selectAll(c.selectorTarget(a)),e=d.filter(c.isNoneArc.bind(c)),f=d.filter(c.isArc.bind(c));this.revert(),b(e.classed(yb[E],!1)),b(f),c.hasArcType()&&c.unexpandArc(a),c.toggleFocusLegend(a,!1)},e.revert=function(a){function b(a){c.filterTargetsToShow(a).transition().duration(100).style("opacity",1)}var c=this.internal,d=c.svg.selectAll(c.selectorTarget(a)),e=d.filter(c.isNoneArc.bind(c)),f=d.filter(c.isArc.bind(c));b(e.classed(yb[E],!1)),b(f),c.hasArcType()&&c.unexpandArc(a),c.revertLegend()},e.show=function(a,b){var c=this.internal;a=c.mapToTargetIds(a),b=b||{},c.removeHiddenTargetIds(a),c.svg.selectAll(c.selectorTargets(a)).transition().style("opacity",1),b.withLegend&&c.showLegend(a),c.redraw({withUpdateOrgXDomain:!0,withUpdateXDomain:!0,withLegend:!0})},e.hide=function(a,b){var c=this.internal;a=c.mapToTargetIds(a),b=b||{},c.addHiddenTargetIds(a),c.svg.selectAll(c.selectorTargets(a)).transition().style("opacity",0),b.withLegend&&c.hideLegend(a),c.redraw({withUpdateOrgXDomain:!0,withUpdateXDomain:!0,withLegend:!0})},e.toggle=function(a){var b=this.internal;b.isTargetToShow(a)?this.hide(a):this.show(a)},e.zoom=function(){},e.zoom.enable=function(a){var b=this.internal;b.config.zoom_enabled=a,b.updateAndRedraw()},e.unzoom=function(){var a=this.internal;a.brush.clear().update(),a.redraw({withUpdateXDomain:!0})},e.load=function(a){var b=this.internal,c=b.config;return a.xs&&b.addXs(a.xs),"classes"in a&&Object.keys(a.classes).forEach(function(b){c.data_classes[b]=a.classes[b]}),"categories"in a&&b.isCategorized()&&(c.axis_x_categories=a.categories),"cacheIds"in a&&b.hasCaches(a.cacheIds)?void b.load(b.getCaches(a.cacheIds),a.done):void("unload"in a?b.unload(b.mapToTargetIds("boolean"==typeof a.unload&&a.unload?null:a.unload),function(){b.loadFromArgs(a)}):b.loadFromArgs(a))},e.unload=function(a){var b=this.internal;a=a||{},b.unload(b.mapToTargetIds(a.ids),function(){b.redraw({withUpdateOrgXDomain:!0,withUpdateXDomain:!0,withLegend:!0}),a.done&&a.done()})},e.flow=function(a){var b,c,d,e,f,g,h,i,j=this.internal,k=[],l=j.getMaxDataCount(),m=0,n=0;if(a.json)c=j.convertJsonToData(a.json,a.keys);else if(a.rows)c=j.convertRowsToData(a.rows);else{if(!a.columns)return;c=j.convertColumnsToData(a.columns)}b=j.convertDataToTargets(c,!0),j.data.targets.forEach(function(a){var c,d,e=!1;for(c=0;c<b.length;c++)if(a.id===b[c].id){for(e=!0,a.values[a.values.length-1]&&(n=a.values[a.values.length-1].index+1),m=b[c].values.length,d=0;m>d;d++)b[c].values[d].index=n+d,j.isTimeSeries()||(b[c].values[d].x=n+d);a.values=a.values.concat(b[c].values),b.splice(c,1);break}e||k.push(a.id)}),j.data.targets.forEach(function(a){var b,c;for(b=0;b<k.length;b++)if(a.id===k[b])for(n=a.values[a.values.length-1].index+1,c=0;m>c;c++)a.values.push({id:a.id,index:n+c,x:j.isTimeSeries()?j.getOtherTargetX(n+c):n+c,value:null})}),j.data.targets.length&&b.forEach(function(a){var b,c=[];for(b=j.data.targets[0].values[0].index;n>b;b++)c.push({id:a.id,index:b,x:j.isTimeSeries()?j.getOtherTargetX(b):b,value:null});a.values.forEach(function(a){a.index+=n,j.isTimeSeries()||(a.x+=n)}),a.values=c.concat(a.values)}),j.data.targets=j.data.targets.concat(b),d=j.getMaxDataCount(),f=j.data.targets[0],g=f.values[0],Db(a.to)?(m=0,i=j.isTimeSeries()?j.parseDate(a.to):a.to,f.values.forEach(function(a){a.x<i&&m++})):Db(a.length)&&(m=a.length),l?1===l&&j.isTimeSeries()&&(h=(f.values[f.values.length-1].x-g.x)/2,e=[new Date(+g.x-h),new Date(+g.x+h)],j.updateXDomain(null,!0,!0,e)):(h=j.isTimeSeries()?f.values.length>1?f.values[f.values.length-1].x-g.x:g.x-j.getXDomain(j.data.targets)[0]:1,e=[g.x-h,g.x],j.updateXDomain(null,!0,!0,e)),j.updateTargets(j.data.targets),j.redraw({flow:{index:g.index,length:m,duration:zb(a.duration)?a.duration:j.config.transition_duration,done:a.done,orgDataCount:l},withLegend:!0,withTransition:l>1})},f.generateFlow=function(a){var b=this,c=b.config,d=b.d3,e=b.CLASS;return function(){var f,g,h,i=a.targets,j=a.flow,k=a.drawBar,l=a.drawLine,m=a.drawArea,n=a.cx,o=a.cy,p=a.xv,q=a.xForText,r=a.yForText,s=a.duration,t=1,u=j.index,v=j.length,w=b.getValueOnIndex(b.data.targets[0].values,u),x=b.getValueOnIndex(b.data.targets[0].values,u+v),A=b.x.domain(),B=j.duration||s,C=j.done||function(){},D=b.generateWait(),E=b.xgrid||d.selectAll([]),F=b.xgridLines||d.selectAll([]),G=b.mainRegion||d.selectAll([]),H=b.mainText||d.selectAll([]),I=b.mainBar||d.selectAll([]),L=b.mainLine||d.selectAll([]),M=b.mainArea||d.selectAll([]),N=b.mainCircle||d.selectAll([]);b.data.targets.forEach(function(a){a.values.splice(0,v)}),h=b.updateXDomain(i,!0,!0),b.updateXGrid&&b.updateXGrid(!0),j.orgDataCount?f=1===j.orgDataCount||w.x===x.x?b.x(A[0])-b.x(h[0]):b.isTimeSeries()?b.x(A[0])-b.x(h[0]):b.x(w.x)-b.x(x.x):1!==b.data.targets[0].values.length?f=b.x(A[0])-b.x(h[0]):b.isTimeSeries()?(w=b.getValueOnIndex(b.data.targets[0].values,0),x=b.getValueOnIndex(b.data.targets[0].values,b.data.targets[0].values.length-1),f=b.x(w.x)-b.x(x.x)):f=Gb(h)/2,t=Gb(A)/Gb(h),g="translate("+f+",0) scale("+t+",1)",d.transition().ease("linear").duration(B).each(function(){D.add(b.axes.x.transition().call(b.xAxis)),D.add(I.transition().attr("transform",g)),D.add(L.transition().attr("transform",g)),D.add(M.transition().attr("transform",g)),D.add(N.transition().attr("transform",g)),D.add(H.transition().attr("transform",g)),D.add(G.filter(b.isRegionOnX).transition().attr("transform",g)),D.add(E.transition().attr("transform",g)),D.add(F.transition().attr("transform",g))}).call(D,function(){var a,d=[],f=[],g=[];if(v){for(a=0;v>a;a++)d.push("."+e[J]+"-"+(u+a)),f.push("."+e[W]+"-"+(u+a)),g.push("."+e[y]+"-"+(u+a));b.svg.selectAll("."+e[K]).selectAll(d).remove(),b.svg.selectAll("."+e[X]).selectAll(f).remove(),b.svg.selectAll("."+e[z]).selectAll(g).remove(),b.svg.select("."+e[$]).remove()}E.attr("transform",null).attr(b.xgridAttr),F.attr("transform",null),F.select("line").attr("x1",c.axis_rotated?0:p).attr("x2",c.axis_rotated?b.width:p),F.select("text").attr("x",c.axis_rotated?b.width:0).attr("y",p),I.attr("transform",null).attr("d",k),L.attr("transform",null).attr("d",l),M.attr("transform",null).attr("d",m),N.attr("transform",null).attr("cx",n).attr("cy",o),H.attr("transform",null).attr("x",q).attr("y",r).style("fill-opacity",b.opacityForText.bind(b)),G.attr("transform",null),G.select("rect").filter(b.isRegionOnX).attr("x",b.regionX.bind(b)).attr("width",b.regionWidth.bind(b)),b.updateEventRect(),C()})}},e.selected=function(a){var b=this.internal,c=b.d3;return c.merge(b.main.selectAll("."+yb[K]+b.getTargetSelectorSuffix(a)).selectAll("."+yb[J]).filter(function(){return c.select(this).classed(yb[wb])}).map(function(a){return a.map(function(a){var b=a.__data__;return b.data?b.data:b})}))},e.select=function(a,b,c){var d=this.internal,e=d.d3,f=d.config;f.data_selection_enabled&&d.main.selectAll("."+yb[K]).selectAll("."+yb[J]).each(function(g,h){var i=e.select(this),j=g.data?g.data.id:g.id,k=d.getToggle(this),l=f.data_selection_grouped||!a||a.indexOf(j)>=0,m=!b||b.indexOf(h)>=0,n=i.classed(yb[wb]);i.classed(yb[L])||i.classed(yb[T])||(l&&m?f.data_selection_isselectable(g)&&!n&&k(!0,i.classed(yb[wb],!0),g,h):Db(c)&&c&&n&&k(!1,i.classed(yb[wb],!1),g,h))})},e.unselect=function(a,b){var c=this.internal,d=c.d3,e=c.config;e.data_selection_enabled&&c.main.selectAll("."+yb[K]).selectAll("."+yb[J]).each(function(f,g){var h=d.select(this),i=f.data?f.data.id:f.id,j=c.getToggle(this),k=e.data_selection_grouped||!a||a.indexOf(i)>=0,l=!b||b.indexOf(g)>=0,m=h.classed(yb[wb]);h.classed(yb[L])||h.classed(yb[T])||k&&l&&e.data_selection_isselectable(f)&&m&&j(!1,h.classed(yb[wb],!1),f,g)})},e.transform=function(a,b){var c=this.internal,d=["pie","donut"].indexOf(a)>=0?{withTransform:!0}:null;c.transformTo(b,a,d)},f.transformTo=function(a,b,c){var d=this,e=!d.hasArcType(),f=c||{withTransitionForAxis:e};f.withTransitionForTransform=!1,d.transiting=!1,d.setTargetType(a,b),d.updateAndRedraw(f)},e.groups=function(a){var b=this.internal,c=b.config;return Cb(a)?c.data_groups:(c.data_groups=a,b.redraw(),c.data_groups)},e.xgrids=function(a){var b=this.internal,c=b.config;return a?(c.grid_x_lines=a,b.redraw(),c.grid_x_lines):c.grid_x_lines},e.xgrids.add=function(a){var b=this.internal;return this.xgrids(b.config.grid_x_lines.concat(a?a:[]))},e.xgrids.remove=function(a){var b=this.internal;b.removeGridLines(a,!0)},e.ygrids=function(a){var b=this.internal,c=b.config;return a?(c.grid_y_lines=a,b.redraw(),c.grid_y_lines):c.grid_y_lines},e.ygrids.add=function(a){var b=this.internal;return this.ygrids(b.config.grid_y_lines.concat(a?a:[]))},e.ygrids.remove=function(a){var b=this.internal;b.removeGridLines(a,!1)},e.regions=function(a){var b=this.internal,c=b.config;return a?(c.regions=a,b.redraw(),c.regions):c.regions},e.regions.add=function(a){var b=this.internal,c=b.config;return a?(c.regions=c.regions.concat(a),b.redraw(),c.regions):c.regions},e.regions.remove=function(a){var b,c,d,e=this.internal,f=e.config;return a=a||{},b=e.getOption(a,"duration",f.transition_duration),c=e.getOption(a,"classes",[yb[F]]),d=e.main.select("."+yb[G]).selectAll(c.map(function(a){return"."+a})),(b?d.transition().duration(b):d).style("opacity",0).remove(),f.regions=f.regions.filter(function(a){var b=!1;return a.class?(a.class.split(" ").forEach(function(a){c.indexOf(a)>=0&&(b=!0)}),!b):!0}),f.regions},e.data=function(){},e.data.get=function(a){var b=this.data.getAsTarget(a);return Db(b)?b.values.map(function(a){return a.value}):void 0},e.data.getAsTarget=function(a){var b=this.data.targets.filter(function(b){return b.id===a});return b.length>0?b[0]:void 0},e.data.names=function(a){var b=this.internal,c=b.config;return arguments.length?(Object.keys(a).forEach(function(b){c.data_names[b]=a[b]}),b.redraw({withLegend:!0}),c.data_names):c.data_names},e.data.colors=function(a){var b=this.internal,c=b.config;return arguments.length?(Object.keys(a).forEach(function(b){c.data_colors[b]=a[b]}),b.redraw({withLegend:!0}),c.data_colors):c.data_colors},e.category=function(a,b){var c=this.internal,d=c.config;return arguments.length>1&&(d.axis_x_categories[a]=b,c.redraw()),d.axis_x_categories[a]},e.categories=function(a){var b=this.internal,c=b.config;return arguments.length?(c.axis_x_categories=a,b.redraw(),c.axis_x_categories):c.axis_x_categories},e.color=function(a){var b=this.internal;return b.color(a)},e.x=function(a){var b=this.internal;return arguments.length&&(b.updateTargetX(b.data.targets,a),b.redraw({withUpdateOrgXDomain:!0,withUpdateXDomain:!0})),b.data.xs},e.xs=function(a){var b=this.internal;return arguments.length&&(b.updateTargetXs(b.data.targets,a),b.redraw({withUpdateOrgXDomain:!0,withUpdateXDomain:!0})),b.data.xs},e.axis=function(){},e.axis.labels=function(a){var b=this.internal;arguments.length&&(Object.keys(a).forEach(function(c){b.setAxisLabelText(c,a[c])}),b.updateAxisLabels())},e.axis.max=function(a){var b=this.internal,c=b.config;arguments.length&&("object"==typeof a?(zb(a.x)&&(c.axis_x_max=a.x),zb(a.y)&&(c.axis_y_max=a.y),zb(a.y2)&&(c.axis_y2_max=a.y2)):c.axis_y_max=c.axis_y2_max=a,b.redraw({withUpdateOrgXDomain:!0,withUpdateXDomain:!0}))},e.axis.min=function(a){var b=this.internal,c=b.config;arguments.length&&("object"==typeof a?(zb(a.x)&&(c.axis_x_min=a.x),zb(a.y)&&(c.axis_y_min=a.y),zb(a.y2)&&(c.axis_y2_min=a.y2)):c.axis_y_min=c.axis_y2_min=a,b.redraw({withUpdateOrgXDomain:!0,withUpdateXDomain:!0}))},e.axis.range=function(a){arguments.length&&(Db(a.max)&&this.axis.max(a.max),Db(a.min)&&this.axis.min(a.min))},e.legend=function(){},e.legend.show=function(a){var b=this.internal;b.showLegend(b.mapToTargetIds(a)),b.updateAndRedraw({withLegend:!0})},e.legend.hide=function(a){var b=this.internal;b.hideLegend(b.mapToTargetIds(a)),b.updateAndRedraw({withLegend:!0})},e.resize=function(a){var b=this.internal,c=b.config;c.size_width=a?a.width:null,c.size_height=a?a.height:null,this.flush()},e.flush=function(){var a=this.internal;a.updateAndRedraw({withLegend:!0,withTransition:!1,withTransitionForTransform:!1})},e.destroy=function(){var b=this.internal;b.data.targets=void 0,b.data.xs={},b.selectChart.classed("c3",!1).html(""),a.onresize=null},"function"==typeof define&&define.amd?define("c3",["d3"],g):"undefined"!=typeof exports&&"undefined"!=typeof module?module.exports=g:a.c3=g}(window);
\ No newline at end of file
diff --git a/src/api.axis.js b/src/api.axis.js
index 104a69b..775ac1f 100644
--- a/src/api.axis.js
+++ b/src/api.axis.js
@@ -13,11 +13,11 @@ 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; }
+            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;
+            config.axis_y_max = config.axis_y2_max = max;
         }
         $$.redraw({withUpdateOrgXDomain: true, withUpdateXDomain: true});
     }
@@ -26,11 +26,11 @@ c3_chart_fn.axis.min = function (min) {
     var $$ = this.internal, config = $$.config;
     if (arguments.length) {
         if (typeof min === 'object') {
-            if (isValue(min.x)) { config[__axis_x_min] = min.x; }
-            if (isValue(min.y)) { config[__axis_y_min] = min.y; }
-            if (isValue(min.y2)) { config[__axis_y2_min] = min.y2; }
+            if (isValue(min.x)) { config.axis_x_min = min.x; }
+            if (isValue(min.y)) { config.axis_y_min = min.y; }
+            if (isValue(min.y2)) { config.axis_y2_min = min.y2; }
         } else {
-            config[__axis_y_min] = config[__axis_y2_min] = min;
+            config.axis_y_min = config.axis_y2_min = min;
         }
         $$.redraw({withUpdateOrgXDomain: true, withUpdateXDomain: true});
     }
diff --git a/src/api.category.js b/src/api.category.js
index 8fca10a..1616c4a 100644
--- a/src/api.category.js
+++ b/src/api.category.js
@@ -1,15 +1,15 @@
 c3_chart_fn.category = function (i, category) {
     var $$ = this.internal, config = $$.config;
     if (arguments.length > 1) {
-        config[__axis_x_categories][i] = category;
+        config.axis_x_categories[i] = category;
         $$.redraw();
     }
-    return config[__axis_x_categories][i];
+    return config.axis_x_categories[i];
 };
 c3_chart_fn.categories = function (categories) {
     var $$ = this.internal, config = $$.config;
-    if (!arguments.length) { return config[__axis_x_categories]; }
-    config[__axis_x_categories] = categories;
+    if (!arguments.length) { return config.axis_x_categories; }
+    config.axis_x_categories = categories;
     $$.redraw();
-    return config[__axis_x_categories];
+    return config.axis_x_categories;
 };
diff --git a/src/api.chart.js b/src/api.chart.js
index ee15243..ad4d170 100644
--- a/src/api.chart.js
+++ b/src/api.chart.js
@@ -1,7 +1,7 @@
 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;
+    config.size_width = size ? size.width : null;
+    config.size_height = size ? size.height : null;
     this.flush();
 };
 
diff --git a/src/api.data.js b/src/api.data.js
index c6f6da3..b761eaa 100644
--- a/src/api.data.js
+++ b/src/api.data.js
@@ -9,19 +9,19 @@ c3_chart_fn.data.getAsTarget = function (targetId) {
 };
 c3_chart_fn.data.names = function (names) {
     var $$ = this.internal, config = $$.config;
-    if (!arguments.length) { return config[__data_names]; }
+    if (!arguments.length) { return config.data_names; }
     Object.keys(names).forEach(function (id) {
-        config[__data_names][id] = names[id];
+        config.data_names[id] = names[id];
     });
     $$.redraw({withLegend: true});
-    return config[__data_names];
+    return config.data_names;
 };
 c3_chart_fn.data.colors = function (colors) {
     var $$ = this.internal, config = $$.config;
-    if (!arguments.length) { return config[__data_colors]; }
+    if (!arguments.length) { return config.data_colors; }
     Object.keys(colors).forEach(function (id) {
-        config[__data_colors][id] = colors[id];
+        config.data_colors[id] = colors[id];
     });
     $$.redraw({withLegend: true});
-    return config[__data_colors];
+    return config.data_colors;
 };
diff --git a/src/api.flow.js b/src/api.flow.js
index 3b0e3a2..861b678 100644
--- a/src/api.flow.js
+++ b/src/api.flow.js
@@ -130,7 +130,7 @@ c3_chart_fn.flow = function (args) {
         flow: {
             index: baseValue.index,
             length: length,
-            duration: isValue(args.duration) ? args.duration : $$.config[__transition_duration],
+            duration: isValue(args.duration) ? args.duration : $$.config.transition_duration,
             done: args.done,
             orgDataCount: orgDataCount,
         },
@@ -243,10 +243,10 @@ c3_chart_internal_fn.generateFlow = function (args) {
             xgridLines
                 .attr('transform', null);
             xgridLines.select('line')
-                .attr("x1", config[__axis_rotated] ? 0 : xv)
-                .attr("x2", config[__axis_rotated] ? $$.width : xv);
+                .attr("x1", config.axis_rotated ? 0 : xv)
+                .attr("x2", config.axis_rotated ? $$.width : xv);
             xgridLines.select('text')
-                .attr("x", config[__axis_rotated] ? $$.width : 0)
+                .attr("x", config.axis_rotated ? $$.width : 0)
                 .attr("y", xv);
             mainBar
                 .attr('transform', null)
diff --git a/src/api.grid.js b/src/api.grid.js
index 5d38050..52db2ea 100644
--- a/src/api.grid.js
+++ b/src/api.grid.js
@@ -1,13 +1,13 @@
 c3_chart_fn.xgrids = function (grids) {
     var $$ = this.internal, config = $$.config;
-    if (! grids) { return config[__grid_x_lines]; }
-    config[__grid_x_lines] = grids;
+    if (! grids) { return config.grid_x_lines; }
+    config.grid_x_lines = grids;
     $$.redraw();
-    return config[__grid_x_lines];
+    return config.grid_x_lines;
 };
 c3_chart_fn.xgrids.add = function (grids) {
     var $$ = this.internal;
-    return this.xgrids($$.config[__grid_x_lines].concat(grids ? grids : []));
+    return this.xgrids($$.config.grid_x_lines.concat(grids ? grids : []));
 };
 c3_chart_fn.xgrids.remove = function (params) { // TODO: multiple
     var $$ = this.internal;
@@ -16,14 +16,14 @@ c3_chart_fn.xgrids.remove = function (params) { // TODO: multiple
 
 c3_chart_fn.ygrids = function (grids) {
     var $$ = this.internal, config = $$.config;
-    if (! grids) { return config[__grid_y_lines]; }
-    config[__grid_y_lines] = grids;
+    if (! grids) { return config.grid_y_lines; }
+    config.grid_y_lines = grids;
     $$.redraw();
-    return config[__grid_y_lines];
+    return config.grid_y_lines;
 };
 c3_chart_fn.ygrids.add = function (grids) {
     var $$ = this.internal;
-    return this.ygrids($$.config[__grid_y_lines].concat(grids ? grids : []));
+    return this.ygrids($$.config.grid_y_lines.concat(grids ? grids : []));
 };
 c3_chart_fn.ygrids.remove = function (params) { // TODO: multiple
     var $$ = this.internal;
diff --git a/src/api.group.js b/src/api.group.js
index 7c85494..47fedb4 100644
--- a/src/api.group.js
+++ b/src/api.group.js
@@ -1,7 +1,7 @@
 c3_chart_fn.groups = function (groups) {
     var $$ = this.internal, config = $$.config;
-    if (isUndefined(groups)) { return config[__data_groups]; }
-    config[__data_groups] = groups;
+    if (isUndefined(groups)) { return config.data_groups; }
+    config.data_groups = groups;
     $$.redraw();
-    return config[__data_groups];
+    return config.data_groups;
 };
diff --git a/src/api.load.js b/src/api.load.js
index 98d8dad..3f87393 100644
--- a/src/api.load.js
+++ b/src/api.load.js
@@ -7,12 +7,12 @@ c3_chart_fn.load = function (args) {
     // update classes if exists
     if ('classes' in args) {
         Object.keys(args.classes).forEach(function (id) {
-            config[__data_classes][id] = args.classes[id];
+            config.data_classes[id] = args.classes[id];
         });
     }
     // update categories if exists
     if ('categories' in args && $$.isCategorized()) {
-        config[__axis_x_categories] = args.categories;
+        config.axis_x_categories = args.categories;
     }
     // use cache if exists
     if ('cacheIds' in args && $$.hasCaches(args.cacheIds)) {
diff --git a/src/api.region.js b/src/api.region.js
index 39b7219..9316e1f 100644
--- a/src/api.region.js
+++ b/src/api.region.js
@@ -1,23 +1,23 @@
 c3_chart_fn.regions = function (regions) {
     var $$ = this.internal, config = $$.config;
-    if (!regions) { return config[__regions]; }
-    config[__regions] = regions;
+    if (!regions) { return config.regions; }
+    config.regions = regions;
     $$.redraw();
-    return config[__regions];
+    return config.regions;
 };
 c3_chart_fn.regions.add = function (regions) {
     var $$ = this.internal, config = $$.config;
-    if (!regions) { return config[__regions]; }
-    config[__regions] = config[__regions].concat(regions);
+    if (!regions) { return config.regions; }
+    config.regions = config.regions.concat(regions);
     $$.redraw();
-    return config[__regions];
+    return config.regions;
 };
 c3_chart_fn.regions.remove = function (options) {
     var $$ = this.internal, config = $$.config,
         duration, classes, regions;
 
     options = options || {};
-    duration = $$.getOption(options, "duration", config[__transition_duration]);
+    duration = $$.getOption(options, "duration", config.transition_duration);
     classes = $$.getOption(options, "classes", [CLASS[_region]]);
 
     regions = $$.main.select('.' + CLASS[_regions]).selectAll(classes.map(function (c) { return '.' + c; }));
@@ -25,7 +25,7 @@ c3_chart_fn.regions.remove = function (options) {
         .style('opacity', 0)
         .remove();
 
-    config[__regions] = config[__regions].filter(function (region) {
+    config.regions = config.regions.filter(function (region) {
         var found = false;
         if (!region.class) {
             return true;
@@ -36,5 +36,5 @@ c3_chart_fn.regions.remove = function (options) {
         return !found;
     });
 
-    return config[__regions];
+    return config.regions;
 };
diff --git a/src/api.selection.js b/src/api.selection.js
index e647116..cbfc5ba 100644
--- a/src/api.selection.js
+++ b/src/api.selection.js
@@ -8,10 +8,10 @@ c3_chart_fn.selected = function (targetId) {
 };
 c3_chart_fn.select = function (ids, indices, resetOther) {
     var $$ = this.internal, d3 = $$.d3, config = $$.config;
-    if (! config[__data_selection_enabled]) { return; }
+    if (! config.data_selection_enabled) { return; }
     $$.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 = $$.getToggle(this),
-            isTargetId = config[__data_selection_grouped] || !ids || ids.indexOf(id) >= 0,
+            isTargetId = config.data_selection_grouped || !ids || ids.indexOf(id) >= 0,
             isTargetIndex = !indices || indices.indexOf(i) >= 0,
             isSelected = shape.classed(CLASS[_SELECTED]);
         // line/area selection not supported yet
@@ -19,7 +19,7 @@ c3_chart_fn.select = function (ids, indices, resetOther) {
             return;
         }
         if (isTargetId && isTargetIndex) {
-            if (config[__data_selection_isselectable](d) && !isSelected) {
+            if (config.data_selection_isselectable(d) && !isSelected) {
                 toggle(true, shape.classed(CLASS[_SELECTED], true), d, i);
             }
         } else if (isDefined(resetOther) && resetOther) {
@@ -31,10 +31,10 @@ c3_chart_fn.select = function (ids, indices, resetOther) {
 };
 c3_chart_fn.unselect = function (ids, indices) {
     var $$ = this.internal, d3 = $$.d3, config = $$.config;
-    if (! config[__data_selection_enabled]) { return; }
+    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,
+            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
@@ -42,7 +42,7 @@ c3_chart_fn.unselect = function (ids, indices) {
             return;
         }
         if (isTargetId && isTargetIndex) {
-            if (config[__data_selection_isselectable](d)) {
+            if (config.data_selection_isselectable(d)) {
                 if (isSelected) {
                     toggle(false, shape.classed(CLASS[_SELECTED], false), d, i);
                 }
diff --git a/src/api.zoom.js b/src/api.zoom.js
index 12e1a5c..0d08e88 100644
--- a/src/api.zoom.js
+++ b/src/api.zoom.js
@@ -2,7 +2,7 @@ c3_chart_fn.zoom = function () {
 };
 c3_chart_fn.zoom.enable = function (enabled) {
     var $$ = this.internal;
-    $$.config[__zoom_enabled] = enabled;
+    $$.config.zoom_enabled = enabled;
     $$.updateAndRedraw();
 };
 c3_chart_fn.unzoom = function () {
diff --git a/src/arc.js b/src/arc.js
index e1dd5eb..007ef63 100644
--- a/src/arc.js
+++ b/src/arc.js
@@ -3,14 +3,14 @@ c3_chart_internal_fn.initPie = function () {
     $$.pie = d3.layout.pie().value(function (d) {
         return d.values.reduce(function (a, b) { return a + b.value; }, 0);
     });
-    if (!config[__data_order] || !config[__pie_sort] || !config[__donut_sort]) {
+    if (!config.data_order || !config.pie_sort || !config.donut_sort) {
         $$.pie.sort(null);
     }
 };
 
 c3_chart_internal_fn.updateRadius = function () {
     var $$ = this, config = $$.config,
-        w = config[__gauge_width] || config[__donut_width];
+        w = config.gauge_width || config.donut_width;
     $$.radiusExpanded = Math.min($$.arcWidth, $$.arcHeight) / 2;
     $$.radius = $$.radiusExpanded * 0.95;
     $$.innerRadiusRatio = w ? ($$.radius - w) / $$.radius : 0.6;
@@ -39,7 +39,7 @@ c3_chart_internal_fn.updateAngle = function (d) {
         d.endAngle = d.startAngle;
     }
     if ($$.isGaugeType(d.data)) {
-        var gMin = config[__gauge_min], gMax = config[__gauge_max],
+        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));
@@ -152,15 +152,15 @@ c3_chart_internal_fn.unexpandArc = function (id) {
 
 c3_chart_internal_fn.shouldExpand = function (id) {
     var $$ = this, config = $$.config;
-    return ($$.isDonutType(id) && config[__donut_expand]) || ($$.isGaugeType(id) && config[__gauge_expand]) || ($$.isPieType(id) && config[__pie_expand]);
+    return ($$.isDonutType(id) && config.donut_expand) || ($$.isGaugeType(id) && config.gauge_expand) || ($$.isPieType(id) && config.pie_expand);
 };
 
 c3_chart_internal_fn.shouldShowArcLabel = function () {
     var $$ = this, config = $$.config, shouldShow = true;
     if ($$.hasType('donut')) {
-        shouldShow = config[__donut_label_show];
+        shouldShow = config.donut_label_show;
     } else if ($$.hasType('pie')) {
-        shouldShow = config[__pie_label_show];
+        shouldShow = config.pie_label_show;
     }
     // when gauge, always true
     return shouldShow;
@@ -168,24 +168,24 @@ c3_chart_internal_fn.shouldShowArcLabel = function () {
 
 c3_chart_internal_fn.meetsArcLabelThreshold = function (ratio) {
     var $$ = this, config = $$.config,
-        threshold = $$.hasType('donut') ? config[__donut_label_threshold] : config[__pie_label_threshold];
+        threshold = $$.hasType('donut') ? config.donut_label_threshold : config.pie_label_threshold;
     return ratio >= threshold;
 };
 
 c3_chart_internal_fn.getArcLabelFormat = function () {
     var $$ = this, config = $$.config,
-        format = config[__pie_label_format];
+        format = config.pie_label_format;
     if ($$.hasType('gauge')) {
-        format = config[__gauge_label_format];
+        format = config.gauge_label_format;
     } else if ($$.hasType('donut')) {
-        format = config[__donut_label_format];
+        format = config.donut_label_format;
     }
     return format;
 };
 
 c3_chart_internal_fn.getArcTitle = function () {
     var $$ = this;
-    return $$.hasType('donut') ? $$.config[__donut_title] : "";
+    return $$.hasType('donut') ? $$.config.donut_title : "";
 };
 
 c3_chart_internal_fn.descByStartAngle = function (a, b) {
@@ -232,7 +232,7 @@ c3_chart_internal_fn.redrawArc = function (duration, durationForExit, withTransf
     mainArc.enter().append('path')
         .attr("class", $$.classArc.bind($$))
         .style("fill", function (d) { return $$.color(d.data); })
-        .style("cursor", function (d) { return config[__data_selection_isselectable](d) ? "pointer" : null; })
+        .style("cursor", function (d) { return config.data_selection_isselectable(d) ? "pointer" : null; })
         .style("opacity", 0)
         .each(function (d) {
             if ($$.isGaugeType(d.data)) {
@@ -250,7 +250,7 @@ c3_chart_internal_fn.redrawArc = function (duration, durationForExit, withTransf
             // transitions
             $$.expandArc(updated.data.id);
             $$.toggleFocusLegend(updated.data.id, true);
-            $$.config[__data_onmouseover](arcData, this);
+            $$.config.data_onmouseover(arcData, this);
         })
         .on('mousemove', function (d) {
             var updated = $$.updateAngle(d),
@@ -269,7 +269,7 @@ c3_chart_internal_fn.redrawArc = function (duration, durationForExit, withTransf
             $$.unexpandArc(updated.data.id);
             $$.revertLegend();
             $$.hideTooltip();
-            $$.config[__data_onmouseout](arcData, this);
+            $$.config.data_onmouseout(arcData, this);
         })
         .on('click', function (d, i) {
             var updated, arcData;
@@ -332,7 +332,7 @@ c3_chart_internal_fn.initGauge = function () {
             .attr("class", CLASS[_chartArcsBackground])
             .attr("d", function () {
                 var d = {
-                    data: [{value: config[__gauge_max]}],
+                    data: [{value: config.gauge_max}],
                     startAngle: -1 * (Math.PI / 2),
                     endAngle: Math.PI / 2
                 };
@@ -343,20 +343,20 @@ c3_chart_internal_fn.initGauge = function () {
             .attr("class", CLASS[_chartArcsGaugeUnit])
             .style("text-anchor", "middle")
             .style("pointer-events", "none")
-            .text(config[__gauge_label_show] ? config[__gauge_units] : '');
+            .text(config.gauge_label_show ? config.gauge_units : '');
         arcs.append("text")
             .attr("dx", -1 * ($$.innerRadius + (($$.radius - $$.innerRadius) / 2)) + "px")
             .attr("dy", "1.2em")
             .attr("class", CLASS[_chartArcsGaugeMin])
             .style("text-anchor", "middle")
             .style("pointer-events", "none")
-            .text(config[__gauge_label_show] ? config[__gauge_min] : '');
+            .text(config.gauge_label_show ? config.gauge_min : '');
         arcs.append("text")
             .attr("dx", $$.innerRadius + (($$.radius - $$.innerRadius) / 2) + "px")
             .attr("dy", "1.2em")
             .attr("class", CLASS[_chartArcsGaugeMax])
             .style("text-anchor", "middle")
             .style("pointer-events", "none")
-            .text(config[__gauge_label_show] ? config[__gauge_max] : '');
+            .text(config.gauge_label_show ? config.gauge_max : '');
     }
 };
diff --git a/src/axis.js b/src/axis.js
index 0de1dc4..7f28b91 100644
--- a/src/axis.js
+++ b/src/axis.js
@@ -4,30 +4,30 @@ c3_chart_internal_fn.initAxis = function () {
         .attr("class", CLASS[_axis] + ' ' + CLASS[_axisX])
         .attr("clip-path", $$.clipPathForXAxis)
         .attr("transform", $$.getTranslate('x'))
-        .style("visibility", config[__axis_x_show] ? 'visible' : 'hidden');
+        .style("visibility", config.axis_x_show ? 'visible' : 'hidden');
     $$.axes.x.append("text")
         .attr("class", CLASS[_axisXLabel])
-        .attr("transform", config[__axis_rotated] ? "rotate(-90)" : "")
+        .attr("transform", config.axis_rotated ? "rotate(-90)" : "")
         .style("text-anchor", $$.textAnchorForXAxisLabel.bind($$));
 
     $$.axes.y = main.append("g")
         .attr("class", CLASS[_axis] + ' ' + CLASS[_axisY])
         .attr("clip-path", $$.clipPathForYAxis)
         .attr("transform", $$.getTranslate('y'))
-        .style("visibility", config[__axis_y_show] ? 'visible' : 'hidden');
+        .style("visibility", config.axis_y_show ? 'visible' : 'hidden');
     $$.axes.y.append("text")
         .attr("class", CLASS[_axisYLabel])
-        .attr("transform", config[__axis_rotated] ? "" : "rotate(-90)")
+        .attr("transform", config.axis_rotated ? "" : "rotate(-90)")
         .style("text-anchor", $$.textAnchorForYAxisLabel.bind($$));
 
     $$.axes.y2 = main.append("g")
         .attr("class", CLASS[_axis] + ' ' + CLASS[_axisY2])
         // clip-path?
         .attr("transform", $$.getTranslate('y2'))
-        .style("visibility", config[__axis_y2_show] ? 'visible' : 'hidden');
+        .style("visibility", config.axis_y2_show ? 'visible' : 'hidden');
     $$.axes.y2.append("text")
         .attr("class", CLASS[_axisY2Label])
-        .attr("transform", config[__axis_rotated] ? "" : "rotate(-90)")
+        .attr("transform", config.axis_rotated ? "" : "rotate(-90)")
         .style("text-anchor", $$.textAnchorForY2AxisLabel.bind($$));
 };
 c3_chart_internal_fn.getXAxis = function (scale, orient, tickFormat, tickValues) {
@@ -37,15 +37,15 @@ c3_chart_internal_fn.getXAxis = function (scale, orient, tickFormat, tickValues)
     // Set tick
     axis.tickFormat(tickFormat).tickValues(tickValues);
     if ($$.isCategorized()) {
-        axis.tickCentered(config[__axis_x_tick_centered]);
-        if (isEmpty(config[__axis_x_tick_culling])) {
-            config[__axis_x_tick_culling] = false;
+        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);
+                base = diff ? diff : (config.axis_rotated ? $$.height : $$.width);
             return (base / $$.getMaxDataCount()) / 2;
         };
     }
@@ -57,17 +57,17 @@ c3_chart_internal_fn.getYAxis = function (scale, orient, tickFormat, ticks) {
 };
 c3_chart_internal_fn.getAxisId = function (id) {
     var config = this.config;
-    return id in config[__data_axes] ? config[__data_axes][id] : 'y';
+    return id in config.data_axes ? config.data_axes[id] : 'y';
 };
 c3_chart_internal_fn.getXAxisTickFormat = function () {
     var $$ = this, config = $$.config,
         format = $$.isTimeSeries() ? $$.defaultAxisTimeFormat : $$.isCategorized() ? $$.categoryName : function (v) { return v < 0 ? v.toFixed(0) : v; };
-    if (config[__axis_x_tick_format]) {
-        if (isFunction(config[__axis_x_tick_format])) {
-            format = config[__axis_x_tick_format];
+    if (config.axis_x_tick_format) {
+        if (isFunction(config.axis_x_tick_format)) {
+            format = config.axis_x_tick_format;
         } else if ($$.isTimeSeries()) {
             format = function (date) {
-                return date ? $$.axisTimeFormat(config[__axis_x_tick_format])(date) : "";
+                return date ? $$.axisTimeFormat(config.axis_x_tick_format)(date) : "";
             };
         }
     }
@@ -76,11 +76,11 @@ c3_chart_internal_fn.getXAxisTickFormat = function () {
 c3_chart_internal_fn.getAxisLabelOptionByAxisId = function (axisId) {
     var $$ = this, config = $$.config, option;
     if (axisId === 'y') {
-        option = config[__axis_y_label];
+        option = config.axis_y_label;
     } else if (axisId === 'y2') {
-        option = config[__axis_y2_label];
+        option = config.axis_y2_label;
     } else if (axisId === 'x') {
-        option = config[__axis_x_label];
+        option = config.axis_x_label;
     }
     return option;
 };
@@ -93,11 +93,11 @@ c3_chart_internal_fn.setAxisLabelText = function (axisId, text) {
         option = $$.getAxisLabelOptionByAxisId(axisId);
     if (isString(option)) {
         if (axisId === 'y') {
-            config[__axis_y_label] = text;
+            config.axis_y_label = text;
         } else if (axisId === 'y2') {
-            config[__axis_y2_label] = text;
+            config.axis_y2_label = text;
         } else if (axisId === 'x') {
-            config[__axis_x_label] = text;
+            config.axis_x_label = text;
         }
     } else if (option) {
         option.text = text;
@@ -118,13 +118,13 @@ c3_chart_internal_fn.getAxisLabelPosition = function (axisId, defaultPosition) {
     };
 };
 c3_chart_internal_fn.getXAxisLabelPosition = function () {
-    return this.getAxisLabelPosition('x', this.config[__axis_rotated] ? 'inner-top' : 'inner-right');
+    return this.getAxisLabelPosition('x', this.config.axis_rotated ? 'inner-top' : 'inner-right');
 };
 c3_chart_internal_fn.getYAxisLabelPosition = function () {
-    return this.getAxisLabelPosition('y', this.config[__axis_rotated] ? 'inner-right' : 'inner-top');
+    return this.getAxisLabelPosition('y', this.config.axis_rotated ? 'inner-right' : 'inner-top');
 };
 c3_chart_internal_fn.getY2AxisLabelPosition = function () {
-    return this.getAxisLabelPosition('y2', this.config[__axis_rotated] ? 'inner-right' : 'inner-top');
+    return this.getAxisLabelPosition('y2', this.config.axis_rotated ? 'inner-right' : 'inner-top');
 };
 c3_chart_internal_fn.getAxisLabelPositionById = function (id) {
     return id === 'y2' ? this.getY2AxisLabelPosition() : id === 'y' ? this.getYAxisLabelPosition() : this.getXAxisLabelPosition();
@@ -161,36 +161,36 @@ c3_chart_internal_fn.textAnchorForAxisLabel = function (forHorizontal, position)
     }
 };
 c3_chart_internal_fn.xForXAxisLabel = function () {
-    return this.xForAxisLabel(!this.config[__axis_rotated], this.getXAxisLabelPosition());
+    return this.xForAxisLabel(!this.config.axis_rotated, this.getXAxisLabelPosition());
 };
 c3_chart_internal_fn.xForYAxisLabel = function () {
-    return this.xForAxisLabel(this.config[__axis_rotated], this.getYAxisLabelPosition());
+    return this.xForAxisLabel(this.config.axis_rotated, this.getYAxisLabelPosition());
 };
 c3_chart_internal_fn.xForY2AxisLabel = function () {
-    return this.xForAxisLabel(this.config[__axis_rotated], this.getY2AxisLabelPosition());
+    return this.xForAxisLabel(this.config.axis_rotated, this.getY2AxisLabelPosition());
 };
 c3_chart_internal_fn.dxForXAxisLabel = function () {
-    return this.dxForAxisLabel(!this.config[__axis_rotated], this.getXAxisLabelPosition());
+    return this.dxForAxisLabel(!this.config.axis_rotated, this.getXAxisLabelPosition());
 };
 c3_chart_internal_fn.dxForYAxisLabel = function () {
-    return this.dxForAxisLabel(this.config[__axis_rotated], this.getYAxisLabelPosition());
+    return this.dxForAxisLabel(this.config.axis_rotated, this.getYAxisLabelPosition());
 };
 c3_chart_internal_fn.dxForY2AxisLabel = function () {
-    return this.dxForAxisLabel(this.config[__axis_rotated], this.getY2AxisLabelPosition());
+    return this.dxForAxisLabel(this.config.axis_rotated, this.getY2AxisLabelPosition());
 };
 c3_chart_internal_fn.dyForXAxisLabel = function () {
     var $$ = this, config = $$.config,
         position = $$.getXAxisLabelPosition();
-    if (config[__axis_rotated]) {
+    if (config.axis_rotated) {
         return position.isInner ? "1.2em" : -25 - $$.getMaxTickWidth('x');
     } else {
-        return position.isInner ? "-0.5em" : config[__axis_x_height] ? config[__axis_x_height] - 10 : "3em";
+        return position.isInner ? "-0.5em" : config.axis_x_height ? config.axis_x_height - 10 : "3em";
     }
 };
 c3_chart_internal_fn.dyForYAxisLabel = function () {
     var $$ = this,
         position = $$.getYAxisLabelPosition();
-    if ($$.config[__axis_rotated]) {
+    if ($$.config.axis_rotated) {
         return position.isInner ? "-0.5em" : "3em";
     } else {
         return position.isInner ? "1.2em" : -20 - $$.getMaxTickWidth('y');
@@ -199,7 +199,7 @@ c3_chart_internal_fn.dyForYAxisLabel = function () {
 c3_chart_internal_fn.dyForY2AxisLabel = function () {
     var $$ = this,
         position = $$.getY2AxisLabelPosition();
-    if ($$.config[__axis_rotated]) {
+    if ($$.config.axis_rotated) {
         return position.isInner ? "1.2em" : "-2.2em";
     } else {
         return position.isInner ? "-0.5em" : 30 + this.getMaxTickWidth('y2');
@@ -207,15 +207,15 @@ c3_chart_internal_fn.dyForY2AxisLabel = function () {
 };
 c3_chart_internal_fn.textAnchorForXAxisLabel = function () {
     var $$ = this;
-    return $$.textAnchorForAxisLabel(!$$.config[__axis_rotated], $$.getXAxisLabelPosition());
+    return $$.textAnchorForAxisLabel(!$$.config.axis_rotated, $$.getXAxisLabelPosition());
 };
 c3_chart_internal_fn.textAnchorForYAxisLabel = function () {
     var $$ = this;
-    return $$.textAnchorForAxisLabel($$.config[__axis_rotated], $$.getYAxisLabelPosition());
+    return $$.textAnchorForAxisLabel($$.config.axis_rotated, $$.getYAxisLabelPosition());
 };
 c3_chart_internal_fn.textAnchorForY2AxisLabel = function () {
     var $$ = this;
-    return $$.textAnchorForAxisLabel($$.config[__axis_rotated], $$.getY2AxisLabelPosition());
+    return $$.textAnchorForAxisLabel($$.config.axis_rotated, $$.getY2AxisLabelPosition());
 };
 
 c3_chart_internal_fn.xForRotatedTickText = function (r) {
@@ -240,13 +240,13 @@ c3_chart_internal_fn.getMaxTickWidth = function (id) {
         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]);
+            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]);
+            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());
+            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 () {
diff --git a/src/category.js b/src/category.js
index 5abe0ba..5143c6c 100644
--- a/src/category.js
+++ b/src/category.js
@@ -1,4 +1,4 @@
 c3_chart_internal_fn.categoryName = function (i) {
     var config = this.config;
-    return i < config[__axis_x_categories].length ? config[__axis_x_categories][i] : i;
+    return i < config.axis_x_categories.length ? config.axis_x_categories[i] : i;
 };
diff --git a/src/class.js b/src/class.js
index 4fc3b5c..10d9f17 100644
--- a/src/class.js
+++ b/src/class.js
@@ -196,7 +196,7 @@ c3_chart_internal_fn.classEvent = function (d) {
 };
 c3_chart_internal_fn.classTarget = function (id) {
     var $$ = this;
-    var additionalClassSuffix = $$.config[__data_classes][id], additionalClass = '';
+    var additionalClassSuffix = $$.config.data_classes[id], additionalClass = '';
     if (additionalClassSuffix) {
         additionalClass = ' ' + CLASS[_target] + '-' + additionalClassSuffix;
     }
diff --git a/src/clip.js b/src/clip.js
index 668c4a1..41a42bb 100644
--- a/src/clip.js
+++ b/src/clip.js
@@ -11,19 +11,19 @@ c3_chart_internal_fn.getAxisClipY = function (forHorizontal) {
 };
 c3_chart_internal_fn.getXAxisClipX = function () {
     var $$ = this;
-    return $$.getAxisClipX(!$$.config[__axis_rotated]);
+    return $$.getAxisClipX(!$$.config.axis_rotated);
 };
 c3_chart_internal_fn.getXAxisClipY = function () {
     var $$ = this;
-    return $$.getAxisClipY(!$$.config[__axis_rotated]);
+    return $$.getAxisClipY(!$$.config.axis_rotated);
 };
 c3_chart_internal_fn.getYAxisClipX = function () {
     var $$ = this;
-    return $$.getAxisClipX($$.config[__axis_rotated]);
+    return $$.getAxisClipX($$.config.axis_rotated);
 };
 c3_chart_internal_fn.getYAxisClipY = function () {
     var $$ = this;
-    return $$.getAxisClipY($$.config[__axis_rotated]);
+    return $$.getAxisClipY($$.config.axis_rotated);
 };
 c3_chart_internal_fn.getAxisClipWidth = function (forHorizontal) {
     var $$ = this;
@@ -32,21 +32,21 @@ c3_chart_internal_fn.getAxisClipWidth = function (forHorizontal) {
 };
 c3_chart_internal_fn.getAxisClipHeight = function (forHorizontal) {
     var $$ = this, config = $$.config;
-    return forHorizontal ? (config[__axis_x_height] ? config[__axis_x_height] : 0) + 80 : $$.height + 8;
+    return forHorizontal ? (config.axis_x_height ? config.axis_x_height : 0) + 80 : $$.height + 8;
 };
 c3_chart_internal_fn.getXAxisClipWidth = function () {
     var $$ = this;
-    return $$.getAxisClipWidth(!$$.config[__axis_rotated]);
+    return $$.getAxisClipWidth(!$$.config.axis_rotated);
 };
 c3_chart_internal_fn.getXAxisClipHeight = function () {
     var $$ = this;
-    return $$.getAxisClipHeight(!$$.config[__axis_rotated]);
+    return $$.getAxisClipHeight(!$$.config.axis_rotated);
 };
 c3_chart_internal_fn.getYAxisClipWidth = function () {
     var $$ = this;
-    return $$.getAxisClipWidth($$.config[__axis_rotated]);
+    return $$.getAxisClipWidth($$.config.axis_rotated);
 };
 c3_chart_internal_fn.getYAxisClipHeight = function () {
     var $$ = this;
-    return $$.getAxisClipHeight($$.config[__axis_rotated]);
+    return $$.getAxisClipHeight($$.config.axis_rotated);
 };
diff --git a/src/color.js b/src/color.js
index 85a9109..4243f65 100644
--- a/src/color.js
+++ b/src/color.js
@@ -1,8 +1,8 @@
 c3_chart_internal_fn.generateColor = function () {
     var $$ = this, config = $$.config, d3 = $$.d3,
-        colors = config[__data_colors],
-        pattern = notEmpty(config[__color_pattern]) ? config[__color_pattern] : d3.scale.category10().range(),
-        callback = config[__data_color],
+        colors = config.data_colors,
+        pattern = notEmpty(config.color_pattern) ? config.color_pattern : d3.scale.category10().range(),
+        callback = config.data_color,
         ids = [];
 
     return function (d) {
@@ -27,12 +27,12 @@ c3_chart_internal_fn.generateColor = function () {
 };
 c3_chart_internal_fn.generateLevelColor = function () {
     var $$ = this, config = $$.config,
-        colors = config[__color_pattern],
-        threshold = config[__color_threshold],
+        colors = config.color_pattern,
+        threshold = config.color_threshold,
         asValue = threshold.unit === 'value',
         values = threshold.values && threshold.values.length ? threshold.values : [],
         max = threshold.max || 100;
-    return notEmpty(config[__color_threshold]) ? function (value) {
+    return notEmpty(config.color_threshold) ? function (value) {
         var i, v, color = colors[colors.length - 1];
         for (i = 0; i < values.length; i++) {
             v = asValue ? value : (value * 100 / max);
diff --git a/src/config.js b/src/config.js
index 56193a9..58c93c3 100644
--- a/src/config.js
+++ b/src/config.js
@@ -1,330 +1,177 @@
-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_xFormat = 'data_xFormat',
-    __data_xLocaltime = 'data_xLocaltime',
-    __data_idConverter = 'data_idConverter',
-    __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_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_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';
-
 c3_chart_internal_fn.getDefaultConfig = function () {
-    var 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_xFormat] = '%Y-%m-%d';
-    config[__data_xLocaltime] = true;
-    config[__data_idConverter] = 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_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_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) {
-        return this.getTooltipContent ? this.getTooltipContent(d, defaultTitleFormat, defaultValueFormat, color) : '';
-    },
-    config[__tooltip_init_show] = false;
-    config[__tooltip_init_x] = 0;
-    config[__tooltip_init_position] = {top: '0px', left: '50px'};
+    var config = {
+        bindto: '#chart',
+        size_width: undefined,
+        size_height: undefined,
+        padding_left: undefined,
+        padding_right: undefined,
+        padding_top: undefined,
+        padding_bottom: undefined,
+        zoom_enabled: false,
+        zoom_extent: undefined,
+        zoom_privileged: false,
+        zoom_onzoom: function () {},
+        interaction_enabled: true,
+        onmouseover: function () {},
+        onmouseout: function () {},
+        onresize: function () {},
+        onresized: function () {},
+        transition_duration: 350,
+        data_x: undefined,
+        data_xs: {},
+        data_xFormat: '%Y-%m-%d',
+        data_xLocaltime: true,
+        data_idConverter: function (id) { return id; },
+        data_names: {},
+        data_classes: {},
+        data_groups: [],
+        data_axes: {},
+        data_type: undefined,
+        data_types: {},
+        data_labels: {},
+        data_order: 'desc',
+        data_regions: {},
+        data_color: undefined,
+        data_colors: {},
+        data_hide: false,
+        data_filter: undefined,
+        data_selection_enabled: false,
+        data_selection_grouped: false,
+        data_selection_isselectable: function () { return true; },
+        data_selection_multiple: true,
+        data_onclick: function () {},
+        data_onmouseover: function () {},
+        data_onmouseout: function () {},
+        data_onselected: function () {},
+        data_onunselected: function () {},
+        data_ondragstart: function () {},
+        data_ondragend: function () {},
+        data_url: undefined,
+        data_json: undefined,
+        data_rows: undefined,
+        data_columns: undefined,
+        data_mimeType: undefined,
+        data_keys: undefined,
+        // configuration for no plot-able data supplied.
+        data_empty_label_text: "",
+        // subchart
+        subchart_show: false,
+        subchart_size_height: 60,
+        subchart_onbrush: function () {},
+        // color
+        color_pattern: [],
+        color_threshold: {},
+        // legend
+        legend_show: true,
+        legend_position: 'bottom',
+        legend_inset_anchor: 'top-left',
+        legend_inset_x: 10,
+        legend_inset_y: 0,
+        legend_inset_step: undefined,
+        legend_item_onclick: undefined,
+        legend_item_onmouseover: undefined,
+        legend_item_onmouseout: undefined,
+        legend_equally: false,
+        // axis
+        axis_rotated: false,
+        axis_x_show: true,
+        axis_x_type: 'indexed',
+        axis_x_localtime: true,
+        axis_x_categories: [],
+        axis_x_tick_centered: false,
+        axis_x_tick_format: undefined,
+        axis_x_tick_culling: {},
+        axis_x_tick_culling_max: 10,
+        axis_x_tick_count: undefined,
+        axis_x_tick_fit: true,
+        axis_x_tick_values: null,
+        axis_x_tick_rotate: undefined,
+        axis_x_tick_outer: true,
+        axis_x_max: null,
+        axis_x_min: null,
+        axis_x_padding: {},
+        axis_x_height: undefined,
+        axis_x_default: undefined,
+        axis_x_label: {},
+        axis_y_show: true,
+        axis_y_max: undefined,
+        axis_y_min: undefined,
+        axis_y_center: undefined,
+        axis_y_label: {},
+        axis_y_tick_format: undefined,
+        axis_y_tick_outer: true,
+        axis_y_padding: undefined,
+        axis_y_ticks: 10,
+        axis_y2_show: false,
+        axis_y2_max: undefined,
+        axis_y2_min: undefined,
+        axis_y2_center: undefined,
+        axis_y2_label: {},
+        axis_y2_tick_format: undefined,
+        axis_y2_tick_outer: true,
+        axis_y2_padding: undefined,
+        axis_y2_ticks: 10,
+        // grid
+        grid_x_show: false,
+        grid_x_type: 'tick',
+        grid_x_lines: [],
+        grid_y_show: false,
+        // not used
+        // grid_y_type: 'tick',
+        grid_y_lines: [],
+        grid_y_ticks: 10,
+        grid_focus_show: true,
+        // point - point of each data
+        point_show: true,
+        point_r: 2.5,
+        point_focus_expand_enabled: true,
+        point_focus_expand_r: undefined,
+        point_select_r: undefined,
+        line_connect_null: false,
+        // bar
+        bar_width: undefined,
+        bar_width_ratio: 0.6,
+        bar_width_max: undefined,
+        bar_zerobased: true,
+        // area
+        area_zerobased: true,
+        // pie
+        pie_label_show: true,
+        pie_label_format: undefined,
+        pie_label_threshold: 0.05,
+        pie_sort: true,
+        pie_expand: true,
+        // gauge
+        gauge_label_show: true,
+        gauge_label_format: undefined,
+        gauge_expand: true,
+        gauge_min: 0,
+        gauge_max: 100,
+        gauge_units: undefined,
+        gauge_width: undefined,
+        // donut
+        donut_label_show: true,
+        donut_label_format: undefined,
+        donut_label_threshold: 0.05,
+        donut_width: undefined,
+        donut_sort: true,
+        donut_expand: true,
+        donut_title: "",
+        // region - region to change style
+        regions: [],
+        // tooltip - show when mouseover on each data
+        tooltip_show: true,
+        tooltip_grouped: true,
+        tooltip_format_title: undefined,
+        tooltip_format_name: undefined,
+        tooltip_format_value: undefined,
+        tooltip_contents: function (d, defaultTitleFormat, defaultValueFormat, color) {
+            return this.getTooltipContent ? this.getTooltipContent(d, defaultTitleFormat, defaultValueFormat, color) : '';
+        },
+        tooltip_init_show: false,
+        tooltip_init_x: 0,
+        tooltip_init_position: {top: '0px', left: '50px'}
+    };
 
     Object.keys(this.additionalConfig).forEach(function (key) {
         config[key] = this.additionalConfig[key];
diff --git a/src/core.js b/src/core.js
index 21c2b22..e6e76ee 100644
--- a/src/core.js
+++ b/src/core.js
@@ -47,17 +47,17 @@ c3_chart_internal_fn.init = function () {
 
     $$.initParams();
 
-    if (config[__data_url]) {
-        $$.convertUrlToData(config[__data_url], config[__data_mimeType], config[__data_keys], $$.initWithData);
+    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_json) {
+        $$.initWithData($$.convertJsonToData(config.data_json, config.data_keys));
     }
-    else if (config[__data_rows]) {
-        $$.initWithData($$.convertRowsToData(config[__data_rows]));
+    else if (config.data_rows) {
+        $$.initWithData($$.convertRowsToData(config.data_rows));
     }
-    else if (config[__data_columns]) {
-        $$.initWithData($$.convertColumnsToData(config[__data_columns]));
+    else if (config.data_columns) {
+        $$.initWithData($$.convertColumnsToData(config.data_columns));
     }
     else {
         throw Error('url or json or rows or columns is required.');
@@ -84,8 +84,8 @@ c3_chart_internal_fn.initParams = function () {
     $$.color = $$.generateColor();
     $$.levelColor = $$.generateLevelColor();
 
-    $$.dataTimeFormat = config[__data_xLocaltime] ? d3.time.format : d3.time.format.utc;
-    $$.axisTimeFormat = config[__axis_x_localtime] ? d3.time.format : d3.time.format.utc;
+    $$.dataTimeFormat = config.data_xLocaltime ? d3.time.format : d3.time.format.utc;
+    $$.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(); }],
@@ -100,15 +100,15 @@ c3_chart_internal_fn.initParams = function () {
     $$.hiddenTargetIds = [];
     $$.hiddenLegendIds = [];
 
-    $$.xOrient = config[__axis_rotated] ? "left" : "bottom";
-    $$.yOrient = config[__axis_rotated] ? "bottom" : "left";
-    $$.y2Orient = config[__axis_rotated] ? "top" : "right";
-    $$.subXOrient = config[__axis_rotated] ? "left" : "bottom";
+    $$.xOrient = config.axis_rotated ? "left" : "bottom";
+    $$.yOrient = config.axis_rotated ? "bottom" : "left";
+    $$.y2Orient = config.axis_rotated ? "top" : "right";
+    $$.subXOrient = config.axis_rotated ? "left" : "bottom";
 
-    $$.isLegendRight = config[__legend_position] === 'right';
-    $$.isLegendInset = config[__legend_position] === 'inset';
-    $$.isLegendTop = config[__legend_inset_anchor] === 'top-left' || config[__legend_inset_anchor] === 'top-right';
-    $$.isLegendLeft = config[__legend_inset_anchor] === 'top-left' || config[__legend_inset_anchor] === 'bottom-left';
+    $$.isLegendRight = config.legend_position === 'right';
+    $$.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;
     $$.legendItemHeight = 0;
@@ -117,7 +117,7 @@ c3_chart_internal_fn.initParams = function () {
     $$.currentMaxTickWidth = 0;
 
     $$.rotated_padding_left = 30;
-    $$.rotated_padding_right = config[__axis_rotated] && !config[__axis_x_show] ? 0 : 30;
+    $$.rotated_padding_right = config.axis_rotated && !config.axis_x_show ? 0 : 30;
     $$.rotated_padding_top = 5;
 
     $$.withoutFadeIn = {};
@@ -133,7 +133,7 @@ c3_chart_internal_fn.initWithData = function (data) {
     if ($$.initBrush) { $$.initBrush(); }
     if ($$.initZoom) { $$.initZoom(); }
 
-    $$.selectChart = d3.select(config[__bindto]);
+    $$.selectChart = d3.select(config.bindto);
     if ($$.selectChart.empty()) {
         $$.selectChart = d3.select(document.createElement('div')).style('opacity', 0);
         $$.observeInserted($$.selectChart);
@@ -145,18 +145,18 @@ c3_chart_internal_fn.initWithData = function (data) {
     $$.data.xs = {};
     $$.data.targets = $$.convertDataToTargets(data);
 
-    if (config[__data_filter]) {
-        $$.data.targets = $$.data.targets.filter(config[__data_filter]);
+    if (config.data_filter) {
+        $$.data.targets = $$.data.targets.filter(config.data_filter);
     }
 
     // Set targets to hide if needed
-    if (config[__data_hide]) {
-        $$.addHiddenTargetIds(config[__data_hide] === true ? $$.mapToIds($$.data.targets) : config[__data_hide]);
+    if (config.data_hide) {
+        $$.addHiddenTargetIds(config.data_hide === true ? $$.mapToIds($$.data.targets) : config.data_hide);
     }
 
     // when gauge, hide legend // TODO: fix
     if ($$.hasType('gauge')) {
-        config[__legend_show] = false;
+        config.legend_show = false;
     }
 
     // Init sizes and scales
@@ -176,15 +176,15 @@ c3_chart_internal_fn.initWithData = function (data) {
 
     // Set initialized scales to brush and zoom
     if ($$.brush) { $$.brush.scale($$.subX); }
-    if (config[__zoom_enabled]) { $$.zoom.scale($$.x); }
+    if (config.zoom_enabled) { $$.zoom.scale($$.x); }
 
     /*-- Basic Elements --*/
 
     // Define svgs
     $$.svg = $$.selectChart.append("svg")
         .style("overflow", "hidden")
-        .on('mouseenter', function () { return config[__onmouseover].call($$); })
-        .on('mouseleave', function () { return config[__onmouseout].call($$); });
+        .on('mouseenter', function () { return config.onmouseover.call($$); })
+        .on('mouseleave', function () { return config.onmouseout.call($$); });
 
     // Define defs
     $$.defs = $$.svg.append("defs");
@@ -237,7 +237,7 @@ c3_chart_internal_fn.initWithData = function (data) {
 
     // if zoom privileged, insert rect to forefront
     // TODO: is this needed?
-    main.insert('rect', config[__zoom_privileged] ? null : 'g.' + CLASS[_regions])
+    main.insert('rect', config.zoom_privileged ? null : 'g.' + CLASS[_regions])
         .attr('class', CLASS[_zoomRect])
         .attr('width', $$.width)
         .attr('height', $$.height)
@@ -245,8 +245,8 @@ c3_chart_internal_fn.initWithData = function (data) {
         .on("dblclick.zoom", null);
 
     // Set default extent if defined
-    if (config[__axis_x_default]) {
-        $$.brush.extent(isFunction(config[__axis_x_default]) ? config[__axis_x_default]($$.getXDomain()) : config[__axis_x_default]);
+    if (config.axis_x_default) {
+        $$.brush.extent(isFunction(config.axis_x_default) ? config.axis_x_default($$.getXDomain()) : config.axis_x_default);
     }
 
     // Add Axis
@@ -272,13 +272,13 @@ c3_chart_internal_fn.initWithData = function (data) {
     }
     if (window.onresize.add) {
         window.onresize.add(function () {
-            config[__onresize].call($$);
+            config.onresize.call($$);
         });
         window.onresize.add(function () {
             $$.api.flush();
         });
         window.onresize.add(function () {
-            config[__onresized].call($$);
+            config.onresized.call($$);
         });
     }
 
@@ -312,14 +312,14 @@ c3_chart_internal_fn.updateSizes = function () {
         legendWidth = $$.legend ? $$.getLegendWidth() : 0,
         legendHeightForBottom = $$.isLegendRight || $$.isLegendInset ? 0 : legendHeight,
         hasArc = $$.hasArcType(),
-        xAxisHeight = config[__axis_rotated] || hasArc ? 0 : $$.getHorizontalAxisHeight('x'),
-        subchartHeight = config[__subchart_show] && !hasArc ? (config[__subchart_size_height] + xAxisHeight) : 0;
+        xAxisHeight = config.axis_rotated || hasArc ? 0 : $$.getHorizontalAxisHeight('x'),
+        subchartHeight = config.subchart_show && !hasArc ? (config.subchart_size_height + xAxisHeight) : 0;
 
     $$.currentWidth = $$.getCurrentWidth();
     $$.currentHeight = $$.getCurrentHeight();
 
     // for main
-    $$.margin = config[__axis_rotated] ? {
+    $$.margin = config.axis_rotated ? {
         top: $$.getHorizontalAxisHeight('y2') + $$.getCurrentPaddingTop(),
         right: hasArc ? 0 : $$.getCurrentPaddingRight(),
         bottom: $$.getHorizontalAxisHeight('y') + legendHeightForBottom + $$.getCurrentPaddingBottom(),
@@ -332,7 +332,7 @@ c3_chart_internal_fn.updateSizes = function () {
     };
 
     // for subchart
-    $$.margin2 = config[__axis_rotated] ? {
+    $$.margin2 = config.axis_rotated ? {
         top: $$.margin.top,
         right: NaN,
         bottom: 20 + legendHeightForBottom,
@@ -358,8 +358,8 @@ c3_chart_internal_fn.updateSizes = function () {
     if ($$.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;
+    $$.width2 = config.axis_rotated ? $$.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; }
 
@@ -395,7 +395,7 @@ c3_chart_internal_fn.updateTargets = function (targets) {
 
     // Fade-in each chart
     $$.svg.selectAll('.' + CLASS[_target]).filter(function (d) { return $$.isTargetToShow(d.id); })
-      .transition().duration(config[__transition_duration])
+      .transition().duration(config.transition_duration)
         .style("opacity", 1);
 };
 
@@ -409,8 +409,8 @@ c3_chart_internal_fn.redraw = function (options, transitions) {
     var waitForDraw, flow;
     var targetsToShow = $$.filterTargetsToShow($$.data.targets), tickValues, i, intervalForCulling;
     var xv = $$.xv.bind($$),
-        cx = ($$.config[__axis_rotated] ? $$.circleY : $$.circleX).bind($$),
-        cy = ($$.config[__axis_rotated] ? $$.circleX : $$.circleY).bind($$);
+        cx = ($$.config.axis_rotated ? $$.circleY : $$.circleX).bind($$),
+        cy = ($$.config.axis_rotated ? $$.circleX : $$.circleY).bind($$);
 
     options = options || {};
     withY = getOption(options, "withY", true);
@@ -423,14 +423,14 @@ c3_chart_internal_fn.redraw = function (options, transitions) {
     withTransitionForExit = getOption(options, "withTransitionForExit", withTransition);
     withTransitionForAxis = getOption(options, "withTransitionForAxis", withTransition);
 
-    duration = withTransition ? config[__transition_duration] : 0;
+    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]) {
+    if (withLegend && config.legend_show) {
         $$.updateLegend($$.mapToIds($$.data.targets), options, transitions);
     }
 
@@ -442,8 +442,8 @@ c3_chart_internal_fn.redraw = function (options, transitions) {
     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($$.mapTargetsToUniqueXs(targetsToShow), config[__axis_x_tick_count]);
+        if (!config.axis_x_tick_values && (config.axis_x_tick_fit || config.axis_x_tick_count)) {
+            tickValues = $$.generateTickValues($$.mapTargetsToUniqueXs(targetsToShow), config.axis_x_tick_count);
             $$.xAxis.tickValues(tickValues);
             $$.subXAxis.tickValues(tickValues);
         }
@@ -463,9 +463,9 @@ c3_chart_internal_fn.redraw = function (options, transitions) {
 
     // show/hide if manual culling needed
     if (withUpdateXDomain && targetsToShow.length) {
-        if (config[__axis_x_tick_culling] && tickValues) {
+        if (config.axis_x_tick_culling && tickValues) {
             for (i = 1; i < tickValues.length; i++) {
-                if (tickValues.length / i < config[__axis_x_tick_culling_max]) {
+                if (tickValues.length / i < config.axis_x_tick_culling_max) {
                     intervalForCulling = i;
                     break;
                 }
@@ -482,8 +482,8 @@ c3_chart_internal_fn.redraw = function (options, transitions) {
     }
 
     // rotate tick text if needed
-    if (!config[__axis_rotated] && config[__axis_x_tick_rotate]) {
-        $$.rotateTickText($$.axes.x, transitions.axisX, config[__axis_x_tick_rotate]);
+    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
@@ -507,7 +507,7 @@ c3_chart_internal_fn.redraw = function (options, transitions) {
     main.select("text." + CLASS[_text] + '.' + CLASS[_empty])
         .attr("x", $$.width / 2)
         .attr("y", $$.height / 2)
-        .text(config[__data_empty_label_text])
+        .text(config.data_empty_label_text)
       .transition()
         .style('opacity', targetsToShow.length ? 0 : 1);
 
@@ -523,7 +523,7 @@ c3_chart_internal_fn.redraw = function (options, transitions) {
     // lines, areas and cricles
     $$.redrawLine(durationForExit);
     $$.redrawArea(durationForExit);
-    if (config[__point_show]) { $$.redrawCircle(); }
+    if (config.point_show) { $$.redrawCircle(); }
 
     // text
     if ($$.hasDataLabel()) {
@@ -545,7 +545,7 @@ c3_chart_internal_fn.redraw = function (options, transitions) {
         .remove();
 
     // event rect
-    if (config[__interaction_enabled]) {
+    if (config.interaction_enabled) {
         $$.redrawEventRect();
     }
 
@@ -607,8 +607,8 @@ c3_chart_internal_fn.updateAndRedraw = function (options) {
     // 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);
+    if (!(options.withLegend && config.legend_show)) {
+        transitions = $$.generateAxisTransitions(options.withTransitionForAxis ? config.transition_duration : 0);
         // Update scales
         $$.updateScales();
         $$.updateSvgSize();
@@ -620,14 +620,14 @@ c3_chart_internal_fn.updateAndRedraw = function (options) {
 };
 
 c3_chart_internal_fn.isTimeSeries = function () {
-    return this.config[__axis_x_type] === 'timeseries';
+    return this.config.axis_x_type === 'timeseries';
 };
 c3_chart_internal_fn.isCategorized = function () {
-    return this.config[__axis_x_type].indexOf('categor') >= 0;
+    return this.config.axis_x_type.indexOf('categor') >= 0;
 };
 c3_chart_internal_fn.isCustomX = function () {
     var $$ = this, config = $$.config;
-    return !$$.isTimeSeries() && (config[__data_x] || notEmpty(config[__data_xs]));
+    return !$$.isTimeSeries() && (config.data_x || notEmpty(config.data_xs));
 };
 
 c3_chart_internal_fn.getTranslate = function (target) {
@@ -643,16 +643,16 @@ c3_chart_internal_fn.getTranslate = function (target) {
         y = $$.margin3.top;
     } else if (target === 'x') {
         x = 0;
-        y = config[__axis_rotated] ? 0 : $$.height;
+        y = config.axis_rotated ? 0 : $$.height;
     } else if (target === 'y') {
         x = 0;
-        y = config[__axis_rotated] ? $$.height : 0;
+        y = config.axis_rotated ? $$.height : 0;
     } else if (target === 'y2') {
-        x = config[__axis_rotated] ? 0 : $$.width;
-        y = config[__axis_rotated] ? 1 : 0;
+        x = config.axis_rotated ? 0 : $$.width;
+        y = config.axis_rotated ? 1 : 0;
     } else if (target === 'subx') {
         x = 0;
-        y = config[__axis_rotated] ? 0 : $$.height2;
+        y = config.axis_rotated ? 0 : $$.height2;
     } else if (target === 'arc') {
         x = $$.arcWidth / 2;
         y = $$.arcHeight / 2;
@@ -715,7 +715,7 @@ c3_chart_internal_fn.transformMain = function (withTransition, transitions) {
 c3_chart_internal_fn.transformAll = function (withTransition, transitions) {
     var $$ = this;
     $$.transformMain(withTransition, transitions);
-    if ($$.config[__subchart_show]) { $$.transformContext(withTransition, transitions); }
+    if ($$.config.subchart_show) { $$.transformContext(withTransition, transitions); }
     if ($$.legend) { $$.transformLegend(withTransition); }
 };
 
@@ -745,7 +745,7 @@ c3_chart_internal_fn.updateSvgSize = function () {
 
 c3_chart_internal_fn.updateDimension = function () {
     var $$ = this;
-    if ($$.config[__axis_rotated]) {
+    if ($$.config.axis_rotated) {
         $$.axes.x.call($$.xAxis);
         $$.axes.subx.call($$.subXAxis);
     } else {
@@ -843,7 +843,7 @@ c3_chart_internal_fn.parseDate = function (date) {
     } else if (typeof date === 'number') {
         parsedDate = new Date(date);
     } else {
-        parsedDate = $$.dataTimeFormat($$.config[__data_xFormat]).parse(date);
+        parsedDate = $$.dataTimeFormat($$.config.data_xFormat).parse(date);
     }
     if (!parsedDate || isNaN(+parsedDate)) {
         window.console.error("Failed to parse x '" + date + "' to Date object");
diff --git a/src/data.convert.js b/src/data.convert.js
index 7d7c5f7..5f319ec 100644
--- a/src/data.convert.js
+++ b/src/data.convert.js
@@ -29,7 +29,7 @@ c3_chart_internal_fn.convertJsonToData = function (json, keys) {
         targetKeys = keys.value;
         if (keys.x) {
             targetKeys.push(keys.x);
-            $$.config[__data_x] = keys.x;
+            $$.config.data_x = keys.x;
         }
         new_rows.push(targetKeys);
         json.forEach(function (o) {
@@ -100,11 +100,11 @@ c3_chart_internal_fn.convertDataToTargets = function (data, appendXs) {
                 );
             }
             // if not included in input data, find from preloaded data of other id's x
-            else if (config[__data_x]) {
+            else if (config.data_x) {
                 $$.data.xs[id] = $$.getOtherTargetXs();
             }
             // if not included in input data, find from preloaded data
-            else if (notEmpty(config[__data_xs])) {
+            else if (notEmpty(config.data_xs)) {
                 $$.data.xs[id] = $$.getXValuesOfXKey(xKey, $$.data.targets);
             }
             // MEMO: if no x included, use same x of current will be used
@@ -123,7 +123,7 @@ c3_chart_internal_fn.convertDataToTargets = function (data, appendXs) {
 
     // convert to target
     targets = ids.map(function (id, index) {
-        var convertedId = config[__data_idConverter](id);
+        var convertedId = config.data_idConverter(id);
         return {
             id: convertedId,
             id_org: id,
@@ -131,8 +131,8 @@ c3_chart_internal_fn.convertDataToTargets = function (data, appendXs) {
                 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);
+                    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 (isUndefined(d[id]) || $$.data.xs[id].length <= i) {
@@ -164,8 +164,8 @@ c3_chart_internal_fn.convertDataToTargets = function (data, appendXs) {
     });
 
     // set target types
-    if (config[__data_type]) {
-        $$.setTargetType($$.mapToIds(targets).filter(function (id) { return ! (id in config[__data_types]); }), config[__data_type]);
+    if (config.data_type) {
+        $$.setTargetType($$.mapToIds(targets).filter(function (id) { return ! (id in config.data_types); }), config.data_type);
     }
 
     // cache as original id keyed
diff --git a/src/data.js b/src/data.js
index 8313506..71ae99f 100644
--- a/src/data.js
+++ b/src/data.js
@@ -1,13 +1,13 @@
 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));
+    return (config.data_x && key === config.data_x) || (notEmpty(config.data_xs) && hasValue(config.data_xs, key));
 };
 c3_chart_internal_fn.isNotX = function (key) {
     return !this.isX(key);
 };
 c3_chart_internal_fn.getXKey = function (id) {
     var $$ = this, config = $$.config;
-    return config[__data_x] ? config[__data_x] : notEmpty(config[__data_xs]) ? config[__data_xs][id] : null;
+    return config.data_x ? config.data_x : notEmpty(config.data_xs) ? config.data_xs[id] : null;
 };
 c3_chart_internal_fn.getXValuesOfXKey = function (key, targets) {
     var $$ = this,
@@ -35,7 +35,7 @@ c3_chart_internal_fn.getOtherTargetX = function (index) {
 c3_chart_internal_fn.addXs = function (xs) {
     var $$ = this;
     Object.keys(xs).forEach(function (id) {
-        $$.config[__data_xs][id] = xs[id];
+        $$.config.data_xs[id] = xs[id];
     });
 };
 c3_chart_internal_fn.hasMultipleX = function (xs) {
@@ -43,12 +43,12 @@ c3_chart_internal_fn.hasMultipleX = function (xs) {
 };
 c3_chart_internal_fn.isMultipleX = function () {
     var $$ = this, config = $$.config;
-    return notEmpty(config[__data_xs]) && $$.hasMultipleX(config[__data_xs]);
+    return notEmpty(config.data_xs) && $$.hasMultipleX(config.data_xs);
 };
 c3_chart_internal_fn.addName = function (data) {
     var $$ = this, name;
     if (data) {
-        name = $$.config[__data_names][data.id];
+        name = $$.config.data_names[data.id];
         data.name = name ? name : data.id;
     }
     return data;
@@ -203,11 +203,11 @@ c3_chart_internal_fn.hasPositiveValueInTargets = function (targets) {
 };
 c3_chart_internal_fn.isOrderDesc = function () {
     var config = this.config;
-    return config[__data_order] && config[__data_order].toLowerCase() === 'desc';
+    return config.data_order && config.data_order.toLowerCase() === 'desc';
 };
 c3_chart_internal_fn.isOrderAsc = function () {
     var config = this.config;
-    return config[__data_order] && config[__data_order].toLowerCase() === 'asc';
+    return config.data_order && config.data_order.toLowerCase() === 'asc';
 };
 c3_chart_internal_fn.orderTargets = function (targets) {
     var $$ = this, config = $$.config, orderAsc = $$.isOrderAsc(), orderDesc = $$.isOrderDesc();
@@ -218,8 +218,8 @@ c3_chart_internal_fn.orderTargets = function (targets) {
                 t2Sum = t2.values.reduce(reducer, 0);
             return orderAsc ? t2Sum - t1Sum : t1Sum - t2Sum;
         });
-    } else if (isFunction(config[__data_order])) {
-        targets.sort(config[__data_order]);
+    } else if (isFunction(config.data_order)) {
+        targets.sort(config.data_order);
     } // TODO: accept name array for order
     return targets;
 };
@@ -231,9 +231,9 @@ c3_chart_internal_fn.filterRemoveNull = function (data) {
 };
 c3_chart_internal_fn.hasDataLabel = function () {
     var config = this.config;
-    if (typeof config[__data_labels] === 'boolean' && config[__data_labels]) {
+    if (typeof config.data_labels === 'boolean' && config.data_labels) {
         return true;
-    } else if (typeof config[__data_labels] === 'object' && notEmpty(config[__data_labels])) {
+    } else if (typeof config.data_labels === 'object' && notEmpty(config.data_labels)) {
         return true;
     }
     return false;
@@ -276,7 +276,7 @@ c3_chart_internal_fn.findClosestOfValues = function (values, pos, _min, _max) {
         max = _max ? _max : values.length - 1,
         med = Math.floor((max - min) / 2) + min,
         value = values[med],
-        diff = $$.x(value.x) - pos[$$.config[__axis_rotated] ? 1 : 0],
+        diff = $$.x(value.x) - pos[$$.config.axis_rotated ? 1 : 0],
         candidates;
 
     // Update range for search
@@ -325,7 +325,7 @@ c3_chart_internal_fn.findClosest = function (values, pos) {
 c3_chart_internal_fn.dist = function (data, pos) {
     var $$ = this, config = $$.config,
         yScale = $$.getAxisId(data.id) === 'y' ? $$.y : $$.y2,
-        xIndex = config[__axis_rotated] ? 1 : 0,
-        yIndex = config[__axis_rotated] ? 0 : 1;
+        xIndex = config.axis_rotated ? 1 : 0,
+        yIndex = config.axis_rotated ? 0 : 1;
     return Math.pow($$.x(data.x) - pos[xIndex], 2) + Math.pow(yScale(data.value) - pos[yIndex], 2);
 };
diff --git a/src/domain.js b/src/domain.js
index 8fdf2bd..c33e077 100644
--- a/src/domain.js
+++ b/src/domain.js
@@ -2,11 +2,11 @@ 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) {
+    if (config.data_groups.length > 0) {
         hasNegativeValue = $$.hasNegativeValueInTargets(targets);
-        for (j = 0; j < config[__data_groups].length; j++) {
+        for (j = 0; j < config.data_groups.length; j++) {
             // Determine baseId
-            idsInGroup = config[__data_groups][j].filter(function (id) { return ids.indexOf(id) >= 0; });
+            idsInGroup = config.data_groups[j].filter(function (id) { return ids.indexOf(id) >= 0; });
             if (idsInGroup.length === 0) { continue; }
             baseId = idsInGroup[0];
             // Consider negative values
@@ -33,11 +33,11 @@ c3_chart_internal_fn.getYDomainMax = function (targets) {
     var $$ = this, config = $$.config,
         ids = $$.mapToIds(targets), ys = $$.getValuesAsIdKeyed(targets),
         j, k, baseId, idsInGroup, id, hasPositiveValue;
-    if (config[__data_groups].length > 0) {
+    if (config.data_groups.length > 0) {
         hasPositiveValue = $$.hasPositiveValueInTargets(targets);
-        for (j = 0; j < config[__data_groups].length; j++) {
+        for (j = 0; j < config.data_groups.length; j++) {
             // Determine baseId
-            idsInGroup = config[__data_groups][j].filter(function (id) { return ids.indexOf(id) >= 0; });
+            idsInGroup = config.data_groups[j].filter(function (id) { return ids.indexOf(id) >= 0; });
             if (idsInGroup.length === 0) { continue; }
             baseId = idsInGroup[0];
             // Consider positive values
@@ -63,16 +63,16 @@ c3_chart_internal_fn.getYDomainMax = function (targets) {
 c3_chart_internal_fn.getYDomain = function (targets, axisId) {
     var $$ = this, config = $$.config,
         yTargets = targets.filter(function (d) { return $$.getAxisId(d.id) === axisId; }),
-        yMin = axisId === 'y2' ? config[__axis_y2_min] : config[__axis_y_min],
-        yMax = axisId === 'y2' ? config[__axis_y2_max] : config[__axis_y_max],
+        yMin = axisId === 'y2' ? config.axis_y2_min : config.axis_y_min,
+        yMax = axisId === 'y2' ? config.axis_y2_max : config.axis_y_max,
         yDomainMin = isValue(yMin) ? yMin : $$.getYDomainMin(yTargets),
         yDomainMax = isValue(yMax) ? yMax : $$.getYDomainMax(yTargets),
         domainLength, padding, padding_top, padding_bottom,
-        center = axisId === 'y2' ? config[__axis_y2_center] : config[__axis_y_center],
+        center = axisId === 'y2' ? config.axis_y2_center : config.axis_y_center,
         yDomainAbs, lengths, diff, ratio, isAllPositive, isAllNegative,
-        isZeroBased = ($$.hasType('bar', yTargets) && config[__bar_zerobased]) || ($$.hasType('area', yTargets) && config[__area_zerobased]),
-        showHorizontalDataLabel = $$.hasDataLabel() && config[__axis_rotated],
-        showVerticalDataLabel = $$.hasDataLabel() && !config[__axis_rotated];
+        isZeroBased = ($$.hasType('bar', yTargets) && config.bar_zerobased) || ($$.hasType('area', yTargets) && config.area_zerobased),
+        showHorizontalDataLabel = $$.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() : $$.y.domain();
     }
@@ -108,13 +108,13 @@ c3_chart_internal_fn.getYDomain = function (targets, axisId) {
         padding_top += lengths[1];
         padding_bottom += lengths[0];
     }
-    if (axisId === 'y' && config[__axis_y_padding]) {
-        padding_top = $$.getAxisPadding(config[__axis_y_padding], 'top', padding, domainLength);
-        padding_bottom = $$.getAxisPadding(config[__axis_y_padding], 'bottom', padding, domainLength);
+    if (axisId === 'y' && config.axis_y_padding) {
+        padding_top = $$.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 = $$.getAxisPadding(config[__axis_y2_padding], 'bottom', padding, domainLength);
+    if (axisId === 'y2' && config.axis_y2_padding) {
+        padding_top = $$.getAxisPadding(config.axis_y2_padding, 'top', padding, domainLength);
+        padding_bottom = $$.getAxisPadding(config.axis_y2_padding, 'bottom', padding, domainLength);
     }
     // Bar/Area chart should be 0-based if all positive|negative
     if (isZeroBased) {
@@ -125,14 +125,14 @@ c3_chart_internal_fn.getYDomain = function (targets, axisId) {
 };
 c3_chart_internal_fn.getXDomainMin = function (targets) {
     var $$ = this, config = $$.config;
-    return config[__axis_x_min] ?
-        ($$.isTimeSeries() ? this.parseDate(config[__axis_x_min]) : config[__axis_x_min]) :
+    return config.axis_x_min ?
+        ($$.isTimeSeries() ? this.parseDate(config.axis_x_min) : config.axis_x_min) :
     $$.d3.min(targets, function (t) { return $$.d3.min(t.values, function (v) { return v.x; }); });
 };
 c3_chart_internal_fn.getXDomainMax = function (targets) {
     var $$ = this, config = $$.config;
-    return config[__axis_x_max] ?
-        ($$.isTimeSeries() ? this.parseDate(config[__axis_x_max]) : config[__axis_x_max]) :
+    return config.axis_x_max ?
+        ($$.isTimeSeries() ? this.parseDate(config.axis_x_max) : config.axis_x_max) :
     $$.d3.max(targets, function (t) { return $$.d3.max(t.values, function (v) { return v.x; }); });
 };
 c3_chart_internal_fn.getXDomainPadding = function (targets) {
@@ -147,11 +147,11 @@ c3_chart_internal_fn.getXDomainPadding = function (targets) {
     } else {
         padding = diff * 0.01;
     }
-    if (typeof config[__axis_x_padding] === 'object' && notEmpty(config[__axis_x_padding])) {
-        paddingLeft = isValue(config[__axis_x_padding].left) ? config[__axis_x_padding].left : padding;
-        paddingRight = isValue(config[__axis_x_padding].right) ? config[__axis_x_padding].right : padding;
-    } else if (typeof config[__axis_x_padding] === 'number') {
-        paddingLeft = paddingRight = config[__axis_x_padding];
+    if (typeof config.axis_x_padding === 'object' && notEmpty(config.axis_x_padding)) {
+        paddingLeft = isValue(config.axis_x_padding.left) ? config.axis_x_padding.left : padding;
+        paddingRight = isValue(config.axis_x_padding.right) ? config.axis_x_padding.right : padding;
+    } else if (typeof config.axis_x_padding === 'number') {
+        paddingLeft = paddingRight = config.axis_x_padding;
     } else {
         paddingLeft = paddingRight = padding;
     }
@@ -181,13 +181,13 @@ c3_chart_internal_fn.updateXDomain = function (targets, withUpdateXDomain, withU
     if (withUpdateOrgXDomain) {
         $$.x.domain(domain ? domain : $$.d3.extent($$.getXDomain(targets)));
         $$.orgXDomain = $$.x.domain();
-        if (config[__zoom_enabled]) { $$.zoom.scale($$.x).updateScaleExtent(); }
+        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(); }
+        if (config.zoom_enabled) { $$.zoom.scale($$.x).updateScaleExtent(); }
     }
     return $$.x.domain();
 };
diff --git a/src/drag.js b/src/drag.js
index 7918fff..bd2446a 100644
--- a/src/drag.js
+++ b/src/drag.js
@@ -3,9 +3,9 @@ c3_chart_internal_fn.drag = function (mouse) {
     var sx, sy, mx, my, minX, maxX, minY, maxY;
 
     if ($$.hasArcType()) { return; }
-    if (! config[__data_selection_enabled]) { return; } // do nothing if not selectable
-    if (config[__zoom_enabled] && ! $$.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
+    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];
@@ -13,8 +13,8 @@ c3_chart_internal_fn.drag = function (mouse) {
     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);
+    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)
@@ -23,7 +23,7 @@ c3_chart_internal_fn.drag = function (mouse) {
         .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); })
+        .filter(function (d) { return config.data_selection_isselectable(d); })
         .each(function (d, i) {
             var shape = d3.select(this),
                 isSelected = shape.classed(CLASS[_SELECTED]),
@@ -59,19 +59,19 @@ c3_chart_internal_fn.drag = function (mouse) {
 c3_chart_internal_fn.dragstart = function (mouse) {
     var $$ = this, config = $$.config;
     if ($$.hasArcType()) { return; }
-    if (! config[__data_selection_enabled]) { return; } // do nothing if not selectable
+    if (! config.data_selection_enabled) { return; } // do nothing if not selectable
     $$.dragStart = mouse;
     $$.main.select('.' + CLASS[_chart]).append('rect')
         .attr('class', CLASS[_dragarea])
         .style('opacity', 0.1);
     $$.dragging = true;
-    $$.config[__data_ondragstart]();
+    $$.config.data_ondragstart();
 };
 
 c3_chart_internal_fn.dragend = function () {
     var $$ = this, config = $$.config;
     if ($$.hasArcType()) { return; }
-    if (! config[__data_selection_enabled]) { return; } // do nothing if not selectable
+    if (! config.data_selection_enabled) { return; } // do nothing if not selectable
     $$.main.select('.' + CLASS[_dragarea])
         .transition().duration(100)
         .style('opacity', 0)
@@ -79,6 +79,6 @@ c3_chart_internal_fn.dragend = function () {
     $$.main.selectAll('.' + CLASS[_shape])
         .classed(CLASS[_INCLUDED], false);
     $$.dragging = false;
-    $$.config[__data_ondragend]();
+    $$.config.data_ondragend();
 };
 
diff --git a/src/format.js b/src/format.js
index 58c6b1f..91911fa 100644
--- a/src/format.js
+++ b/src/format.js
@@ -9,12 +9,12 @@ c3_chart_internal_fn.getYFormat = function (forArc) {
 };
 c3_chart_internal_fn.yFormat = function (v) {
     var $$ = this, config = $$.config,
-        format = config[__axis_y_tick_format] ? config[__axis_y_tick_format] : $$.defaultValueFormat;
+        format = config.axis_y_tick_format ? config.axis_y_tick_format : $$.defaultValueFormat;
     return format(v);
 };
 c3_chart_internal_fn.y2Format = function (v) {
     var $$ = this, config = $$.config,
-        format = config[__axis_y2_tick_format] ? config[__axis_y2_tick_format] : $$.defaultValueFormat;
+        format = config.axis_y2_tick_format ? config.axis_y2_tick_format : $$.defaultValueFormat;
     return format(v);
 };
 c3_chart_internal_fn.defaultValueFormat = function (v) {
@@ -24,7 +24,7 @@ c3_chart_internal_fn.defaultArcValueFormat = function (v, ratio) {
     return (ratio * 100).toFixed(1) + '%';
 };
 c3_chart_internal_fn.formatByAxisId = function (axisId) {
-    var $$ = this, data_labels = $$.config[__data_labels],
+    var $$ = this, data_labels = $$.config.data_labels,
         format = function (v) { return isValue(v) ? +v : ""; };
     // find format according to axis id
     if (data_labels.format) {
diff --git a/src/grid.js b/src/grid.js
index 3dbdfa2..c76a8ac 100644
--- a/src/grid.js
+++ b/src/grid.js
@@ -3,15 +3,15 @@ c3_chart_internal_fn.initGrid = function () {
     $$.grid = $$.main.append('g')
         .attr("clip-path", $$.clipPath)
         .attr('class', CLASS[_grid]);
-    if (config[__grid_x_show]) {
+    if (config.grid_x_show) {
         $$.grid.append("g").attr("class", CLASS[_xgrids]);
     }
-    if (config[__grid_y_show]) {
+    if (config.grid_y_show) {
         $$.grid.append('g').attr('class', CLASS[_ygrids]);
     }
     $$.grid.append('g').attr("class", CLASS[_xgridLines]);
     $$.grid.append('g').attr('class', CLASS[_ygridLines]);
-    if (config[__grid_focus_show]) {
+    if (config.grid_focus_show) {
         $$.grid.append('g')
             .attr("class", CLASS[_xgridFocus])
             .append('line')
@@ -23,10 +23,10 @@ c3_chart_internal_fn.initGrid = function () {
 
 c3_chart_internal_fn.updateXGrid = function (withoutUpdate) {
     var $$ = this, config = $$.config, CLASS = $$.CLASS, d3 = $$.d3,
-        xgridData = $$.generateGridData(config[__grid_x_type], $$.x),
+        xgridData = $$.generateGridData(config.grid_x_type, $$.x),
         tickOffset = $$.isCategorized() ? $$.xAxis.tickOffset() : 0;
 
-    $$.xgridAttr = config[__axis_rotated] ? {
+    $$.xgridAttr = config.axis_rotated ? {
         'x1': 0,
         'x2': $$.width,
         'y1': function (d) { return $$.x(d) - tickOffset; },
@@ -43,7 +43,7 @@ c3_chart_internal_fn.updateXGrid = function (withoutUpdate) {
     $$.xgrid.enter().append('line').attr("class", CLASS[_xgrid]);
     if (!withoutUpdate) {
         $$.xgrid.attr($$.xgridAttr)
-            .style("opacity", function () { return +d3.select(this).attr(config[__axis_rotated] ? 'y1' : 'x1') === (config[__axis_rotated] ? $$.height : 0) ? 0 : 1; });
+            .style("opacity", function () { return +d3.select(this).attr(config.axis_rotated ? 'y1' : 'x1') === (config.axis_rotated ? $$.height : 0) ? 0 : 1; });
     }
     $$.xgrid.exit().remove();
 };
@@ -51,13 +51,13 @@ c3_chart_internal_fn.updateXGrid = function (withoutUpdate) {
 c3_chart_internal_fn.updateYGrid = function () {
     var $$ = this, config = $$.config, CLASS = $$.CLASS;
     $$.ygrid = $$.main.select('.' + CLASS[_ygrids]).selectAll('.' + CLASS[_ygrid])
-        .data($$.y.ticks(config[__grid_y_ticks]));
+        .data($$.y.ticks(config.grid_y_ticks));
     $$.ygrid.enter().append('line')
         .attr('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.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($$.ygrid, 'grid');
 };
@@ -67,11 +67,11 @@ c3_chart_internal_fn.redrawGrid = function (duration, withY) {
     var $$ = this, main = $$.main, config = $$.config, CLASS = $$.CLASS,
         xgridLine, ygridLine, yv;
     main.select('line.' + CLASS[_xgridFocus]).style("visibility", "hidden");
-    if (config[__grid_x_show]) {
+    if (config.grid_x_show) {
         $$.updateXGrid();
     }
     $$.xgridLines = main.select('.' + CLASS[_xgridLines]).selectAll('.' + CLASS[_xgridLine])
-        .data(config[__grid_x_lines]);
+        .data(config.grid_x_lines);
     // enter
     xgridLine = $$.xgridLines.enter().append('g')
         .attr("class", function (d) { return CLASS[_xgridLine] + (d.class ? ' ' + d.class : ''); });
@@ -79,8 +79,8 @@ c3_chart_internal_fn.redrawGrid = function (duration, withY) {
         .style("opacity", 0);
     xgridLine.append('text')
         .attr("text-anchor", "end")
-        .attr("transform", config[__axis_rotated] ? "" : "rotate(-90)")
-        .attr('dx', config[__axis_rotated] ? 0 : -$$.margin.top)
+        .attr("transform", config.axis_rotated ? "" : "rotate(-90)")
+        .attr('dx', config.axis_rotated ? 0 : -$$.margin.top)
         .attr('dy', -5)
         .style("opacity", 0);
     // udpate
@@ -91,12 +91,12 @@ c3_chart_internal_fn.redrawGrid = function (duration, withY) {
         .remove();
 
     // Y-Grid
-    if (withY && config[__grid_y_show]) {
+    if (withY && config.grid_y_show) {
         $$.updateYGrid();
     }
     if (withY) {
         $$.ygridLines = main.select('.' + CLASS[_ygridLines]).selectAll('.' + CLASS[_ygridLine])
-            .data(config[__grid_y_lines]);
+            .data(config.grid_y_lines);
         // enter
         ygridLine = $$.ygridLines.enter().append('g')
             .attr("class", function (d) { return CLASS[_ygridLine] + (d.class ? ' ' + d.class : ''); });
@@ -104,22 +104,22 @@ c3_chart_internal_fn.redrawGrid = function (duration, withY) {
             .style("opacity", 0);
         ygridLine.append('text')
             .attr("text-anchor", "end")
-            .attr("transform", config[__axis_rotated] ? "rotate(-90)" : "")
-            .attr('dx', config[__axis_rotated] ? 0 : -$$.margin.top)
+            .attr("transform", config.axis_rotated ? "rotate(-90)" : "")
+            .attr('dx', config.axis_rotated ? 0 : -$$.margin.top)
             .attr('dy', -5)
             .style("opacity", 0);
         // update
         yv = $$.yv.bind($$);
         $$.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)
+            .attr("x1", config.axis_rotated ? yv : 0)
+            .attr("x2", config.axis_rotated ? yv : $$.width)
+            .attr("y1", config.axis_rotated ? 0 : yv)
+            .attr("y2", config.axis_rotated ? $$.height : yv)
             .style("opacity", 1);
         $$.ygridLines.select('text')
           .transition().duration(duration)
-            .attr("x", config[__axis_rotated] ? 0 : $$.width)
+            .attr("x", config.axis_rotated ? 0 : $$.width)
             .attr("y", yv)
             .text(function (d) { return d.text; })
             .style("opacity", 1);
@@ -132,13 +132,13 @@ c3_chart_internal_fn.redrawGrid = function (duration, withY) {
 c3_chart_internal_fn.addTransitionForGrid = function (transitions) {
     var $$ = this, config = $$.config, xv = $$.xv.bind($$);
     transitions.push($$.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 : $$.height)
+                     .attr("x1", config.axis_rotated ? 0 : xv)
+                     .attr("x2", config.axis_rotated ? $$.width : xv)
+                     .attr("y1", config.axis_rotated ? xv : $$.margin.top)
+                     .attr("y2", config.axis_rotated ? xv : $$.height)
                      .style("opacity", 1));
     transitions.push($$.xgridLines.select('text').transition()
-                     .attr("x", config[__axis_rotated] ? $$.width : 0)
+                     .attr("x", config.axis_rotated ? $$.width : 0)
                      .attr("y", xv)
                      .text(function (d) { return d.text; })
                      .style("opacity", 1));
@@ -148,14 +148,14 @@ c3_chart_internal_fn.showXGridFocus = function (selectedData) {
         dataToShow = selectedData.filter(function (d) { return d && isValue(d.value); }),
         focusEl = $$.main.selectAll('line.' + CLASS[_xgridFocus]),
         xx = $$.xx.bind($$);
-    if (! config[__tooltip_show]) { return; }
+    if (! config.tooltip_show) { return; }
     // Hide when scatter plot exists
     if ($$.hasType('scatter') || $$.hasArcType()) { return; }
     focusEl
         .style("visibility", "visible")
         .data([dataToShow[0]])
-        .attr(config[__axis_rotated] ? 'y1' : 'x1', xx)
-        .attr(config[__axis_rotated] ? 'y2' : 'x2', xx);
+        .attr(config.axis_rotated ? 'y1' : 'x1', xx)
+        .attr(config.axis_rotated ? 'y2' : 'x2', xx);
     $$.smoothLines(focusEl, 'grid');
 };
 c3_chart_internal_fn.hideXGridFocus = function () {
@@ -164,10 +164,10 @@ c3_chart_internal_fn.hideXGridFocus = function () {
 c3_chart_internal_fn.updateXgridFocus = function () {
     var $$ = 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);
+        .attr("x1", config.axis_rotated ? 0 : -10)
+        .attr("x2", config.axis_rotated ? $$.width : -10)
+        .attr("y1", config.axis_rotated ? -10 : 0)
+        .attr("y2", config.axis_rotated ? -10 : $$.height);
 };
 c3_chart_internal_fn.generateGridData = function (type, scale) {
     var $$ = this,
@@ -206,11 +206,11 @@ c3_chart_internal_fn.removeGridLines = function (params, forX) {
         classLines = forX ? CLASS[_xgridLines] : CLASS[_ygridLines],
         classLine = forX ? CLASS[_xgridLine] : CLASS.ygridLine;
     $$.main.select('.' + classLines).selectAll('.' + classLine).filter(toRemove)
-        .transition().duration(config[__transition_duration])
+        .transition().duration(config.transition_duration)
         .style('opacity', 0).remove();
     if (forX) {
-        config[__grid_x_lines] = config[__grid_x_lines].filter(toShow);
+        config.grid_x_lines = config.grid_x_lines.filter(toShow);
     } else {
-        config[__grid_y_lines] = config[__grid_y_lines].filter(toShow);
+        config.grid_y_lines = config.grid_y_lines.filter(toShow);
     }
 };
diff --git a/src/interaction.js b/src/interaction.js
index 6a8e321..15fec7c 100644
--- a/src/interaction.js
+++ b/src/interaction.js
@@ -11,7 +11,7 @@ c3_chart_internal_fn.redrawEventRect = function () {
 
     // rects for mouseover
     var eventRects = $$.main.select('.' + CLASS[_eventRects])
-            .style('cursor', config[__zoom_enabled] ? config[__axis_rotated] ? 'ns-resize' : 'ew-resize' : null)
+            .style('cursor', config.zoom_enabled ? config.axis_rotated ? 'ns-resize' : 'ew-resize' : null)
             .classed(CLASS[_eventRectsMultiple], isMultipleX)
             .classed(CLASS[_eventRectsSingle], !isMultipleX);
 
@@ -74,10 +74,10 @@ c3_chart_internal_fn.updateEventRect = function (eventRectUpdate) {
                 return $$.x(d.x) - (rectW / 2);
             };
         }
-        x = config[__axis_rotated] ? 0 : rectX;
-        y = config[__axis_rotated] ? rectX : 0;
-        w = config[__axis_rotated] ? $$.width : rectW;
-        h = config[__axis_rotated] ? rectW : $$.height;
+        x = config.axis_rotated ? 0 : rectX;
+        y = config.axis_rotated ? rectX : 0;
+        w = config.axis_rotated ? $$.width : rectW;
+        h = config.axis_rotated ? rectW : $$.height;
     }
 
     eventRectUpdate
@@ -91,7 +91,7 @@ c3_chart_internal_fn.generateEventRectsForSingleX = function (eventRectEnter) {
     var $$ = this, d3 = $$.d3, config = $$.config;
     eventRectEnter.append("rect")
         .attr("class", $$.classEvent.bind($$))
-        .style("cursor", config[__data_selection_enabled] && config[__data_selection_grouped] ? "pointer" : null)
+        .style("cursor", config.data_selection_enabled && config.data_selection_grouped ? "pointer" : null)
         .on('mouseover', function (d) {
             var index = d.index, selectedData, newData;
 
@@ -104,7 +104,7 @@ c3_chart_internal_fn.generateEventRectsForSingleX = function (eventRectEnter) {
 
             // Sort selectedData as names order
             newData = [];
-            Object.keys(config[__data_names]).forEach(function (id) {
+            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]);
@@ -116,12 +116,12 @@ c3_chart_internal_fn.generateEventRectsForSingleX = function (eventRectEnter) {
             selectedData = newData.concat(selectedData); // Add remained
 
             // Expand shapes for selection
-            if (config[__point_focus_expand_enabled]) { $$.expandCircles(index); }
+            if (config.point_focus_expand_enabled) { $$.expandCircles(index); }
             $$.expandBars(index);
 
             // Call event handler
             $$.main.selectAll('.' + CLASS[_shape] + '-' + index).each(function (d) {
-                config[__data_onmouseover].call(c3, d);
+                config.data_onmouseover.call($$, d);
             });
         })
         .on('mouseout', function (d) {
@@ -134,7 +134,7 @@ c3_chart_internal_fn.generateEventRectsForSingleX = function (eventRectEnter) {
             $$.unexpandBars();
             // Call event handler
             $$.main.selectAll('.' + CLASS[_shape] + '-' + index).each(function (d) {
-                config[__data_onmouseout].call($$, d);
+                config.data_onmouseout.call($$, d);
             });
         })
         .on('mousemove', function (d) {
@@ -149,25 +149,25 @@ c3_chart_internal_fn.generateEventRectsForSingleX = function (eventRectEnter) {
                 return $$.addName($$.getValueOnIndex(t.values, index));
             });
 
-            if (config[__tooltip_grouped]) {
+            if (config.tooltip_grouped) {
                 $$.showTooltip(selectedData, d3.mouse(this));
                 $$.showXGridFocus(selectedData);
             }
 
-            if (config[__tooltip_grouped] && (!config[__data_selection_enabled] || config[__data_selection_grouped])) {
+            if (config.tooltip_grouped && (!config.data_selection_enabled || config.data_selection_grouped)) {
                 return;
             }
 
             $$.main.selectAll('.' + CLASS[_shape] + '-' + index)
                 .each(function () {
                     d3.select(this).classed(CLASS[_EXPANDED], true);
-                    if (config[__data_selection_enabled]) {
-                        eventRect.style('cursor', config[__data_selection_grouped] ? 'pointer' : null);
+                    if (config.data_selection_enabled) {
+                        eventRect.style('cursor', config.data_selection_grouped ? 'pointer' : null);
                     }
-                    if (!config[__tooltip_grouped]) {
+                    if (!config.tooltip_grouped) {
                         $$.hideXGridFocus();
                         $$.hideTooltip();
-                        if (!config[__data_selection_grouped]) {
+                        if (!config.data_selection_grouped) {
                             $$.unexpandCircles(index);
                             $$.unexpandBars();
                         }
@@ -182,13 +182,13 @@ c3_chart_internal_fn.generateEventRectsForSingleX = function (eventRectEnter) {
                     }
                 })
                 .each(function (d) {
-                    if (config[__data_selection_enabled] && (config[__data_selection_grouped] || config[__data_selection_isselectable](d))) {
+                    if (config.data_selection_enabled && (config.data_selection_grouped || config.data_selection_isselectable(d))) {
                         eventRect.style('cursor', 'pointer');
                     }
-                    if (!config[__tooltip_grouped]) {
+                    if (!config.tooltip_grouped) {
                         $$.showTooltip([d], d3.mouse(this));
                         $$.showXGridFocus([d]);
-                        if (config[__point_focus_expand_enabled]) { $$.expandCircles(index, d.id); }
+                        if (config.point_focus_expand_enabled) { $$.expandCircles(index, d.id); }
                         $$.expandBars(index, d.id);
                     }
                 });
@@ -252,7 +252,7 @@ c3_chart_internal_fn.generateEventRectsForMultipleXs = function (eventRectEnter)
             $$.showTooltip(selectedData, mouse);
 
             // expand points
-            if (config[__point_focus_expand_enabled]) {
+            if (config.point_focus_expand_enabled) {
                 $$.unexpandCircles();
                 $$.expandCircles(closest.index, closest.id);
             }
@@ -264,12 +264,12 @@ c3_chart_internal_fn.generateEventRectsForMultipleXs = function (eventRectEnter)
             if ($$.dist(closest, mouse) < 100) {
                 $$.svg.select('.' + CLASS[_eventRect]).style('cursor', 'pointer');
                 if (!$$.mouseover) {
-                    config[__data_onmouseover].call($$, closest);
+                    config.data_onmouseover.call($$, closest);
                     $$.mouseover = true;
                 }
             } else if ($$.mouseover) {
                 $$.svg.select('.' + CLASS[_eventRect]).style('cursor', null);
-                config[__data_onmouseout].call($$, closest);
+                config.data_onmouseout.call($$, closest);
                 $$.mouseover = false;
             }
         })
diff --git a/src/legend.js b/src/legend.js
index d7159e8..85f0288 100644
--- a/src/legend.js
+++ b/src/legend.js
@@ -1,7 +1,7 @@
 c3_chart_internal_fn.initLegend = function () {
     var $$ = this;
     $$.legend = $$.svg.append("g").attr("transform", $$.getTranslate('legend'));
-    if (!$$.config[__legend_show]) {
+    if (!$$.config.legend_show) {
         $$.legend.style('visibility', 'hidden');
         $$.hiddenLegendIds = $$.mapToIds($$.data.targets);
     }
@@ -11,8 +11,8 @@ c3_chart_internal_fn.initLegend = function () {
 };
 c3_chart_internal_fn.updateSizeForLegend = function (legendHeight, legendWidth) {
     var $$ = this, config = $$.config, insetLegendPosition = {
-        top: $$.isLegendTop ? $$.getCurrentPaddingTop() + config[__legend_inset_y] + 5.5 : $$.currentHeight - legendHeight - $$.getCurrentPaddingBottom() - config[__legend_inset_y],
-        left: $$.isLegendLeft ? $$.getCurrentPaddingLeft() + config[__legend_inset_x] + 0.5 : $$.currentWidth - legendWidth - $$.getCurrentPaddingRight() - config[__legend_inset_x] + 0.5
+        top: $$.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 : $$.currentHeight - legendHeight,
@@ -36,15 +36,15 @@ c3_chart_internal_fn.updateLegendItemHeight = function (h) {
 };
 c3_chart_internal_fn.getLegendWidth = function () {
     var $$ = this;
-    return $$.config[__legend_show] ? $$.isLegendRight || $$.isLegendInset ? $$.legendItemWidth * ($$.legendStep + 1) : $$.currentWidth : 0;
+    return $$.config.legend_show ? $$.isLegendRight || $$.isLegendInset ? $$.legendItemWidth * ($$.legendStep + 1) : $$.currentWidth : 0;
 };
 c3_chart_internal_fn.getLegendHeight = function () {
     var $$ = this, config = $$.config, h = 0;
-    if (config[__legend_show]) {
+    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) : $$.height;
+            h = config.legend_inset_step ? Math.max(20, $$.legendItemHeight) * (config.legend_inset_step + 1) : $$.height;
         } else {
             h = Math.max(20, $$.legendItemHeight) * ($$.legendStep + 1);
         }
@@ -80,8 +80,8 @@ c3_chart_internal_fn.revertLegend = function () {
 };
 c3_chart_internal_fn.showLegend = function (targetIds) {
     var $$ = this, config = $$.config;
-    if (!config[__legend_show]) {
-        config[__legend_show] = true;
+    if (!config.legend_show) {
+        config.legend_show = true;
         $$.legend.style('visibility', 'visible');
     }
     $$.removeHiddenLegendIds(targetIds);
@@ -92,8 +92,8 @@ c3_chart_internal_fn.showLegend = function (targetIds) {
 };
 c3_chart_internal_fn.hideLegend = function (targetIds) {
     var $$ = this, config = $$.config;
-    if (config[__legend_show] && isEmpty(targetIds)) {
-        config[__legend_show] = false;
+    if (config.legend_show && isEmpty(targetIds)) {
+        config.legend_show = false;
         $$.legend.style('visibility', 'hidden');
     }
     $$.addHiddenLegendIds(targetIds);
@@ -145,7 +145,7 @@ c3_chart_internal_fn.updateLegend = function (targetIds, options, transitions) {
             maxHeight = 0;
         }
 
-        if (config[__legend_show] && !$$.isLegendToShow(id)) {
+        if (config.legend_show && !$$.isLegendToShow(id)) {
             widths[id] = heights[id] = steps[id] = offsets[id] = 0;
             return;
         }
@@ -157,7 +157,7 @@ c3_chart_internal_fn.updateLegend = function (targetIds, options, transitions) {
         if (!maxHeight || itemHeight >= maxHeight) { maxHeight = itemHeight; }
         maxLength = $$.isLegendRight || $$.isLegendInset ? maxHeight : maxWidth;
 
-        if (config[__legend_equally]) {
+        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;
@@ -197,15 +197,15 @@ c3_chart_internal_fn.updateLegend = function (targetIds, options, transitions) {
         .style('visibility', function (id) { return $$.isLegendToShow(id) ? 'visible' : 'hidden'; })
         .style('cursor', 'pointer')
         .on('click', function (id) {
-            config[__legend_item_onclick] ? config[__legend_item_onclick].call($$, id) : $$.api.toggle(id);
+            config.legend_item_onclick ? config.legend_item_onclick.call($$, id) : $$.api.toggle(id);
         })
         .on('mouseover', function (id) {
             $$.d3.select(this).classed(CLASS[_legendItemFocused], true);
             if (!$$.transiting) {
                 $$.api.focus(id);
             }
-            if (config[__legend_item_onmouseover]) {
-                config[__legend_item_onmouseover].call($$, id);
+            if (config.legend_item_onmouseover) {
+                config.legend_item_onmouseover.call($$, id);
             }
         })
         .on('mouseout', function (id) {
@@ -213,12 +213,12 @@ c3_chart_internal_fn.updateLegend = function (targetIds, options, transitions) {
             if (!$$.transiting) {
                 $$.api.revert();
             }
-            if (config[__legend_item_onmouseout]) {
-                config[__legend_item_onmouseout].call($$, id);
+            if (config.legend_item_onmouseout) {
+                config.legend_item_onmouseout.call($$, id);
             }
         });
     l.append('text')
-        .text(function (id) { return isDefined(config[__data_names][id]) ? config[__data_names][id] : id; })
+        .text(function (id) { return isDefined(config.data_names[id]) ? config.data_names[id] : id; })
         .each(function (id, i) { updatePositions(this, id, i === 0); })
         .style("pointer-events", "none")
         .attr('x', $$.isLegendRight || $$.isLegendInset ? xForLegendText : -200)
@@ -247,7 +247,7 @@ c3_chart_internal_fn.updateLegend = function (targetIds, options, transitions) {
 
     texts = $$.legend.selectAll('text')
         .data(targetIds)
-        .text(function (id) { return isDefined(config[__data_names][id]) ? config[__data_names][id] : id; }) // MEMO: needed for update
+        .text(function (id) { return isDefined(config.data_names[id]) ? config.data_names[id] : id; }) // MEMO: needed for update
         .each(function (id, i) { updatePositions(this, id, i === 0); });
     (withTransition ? texts.transition() : texts)
         .attr('x', xForLegendText)
diff --git a/src/region.js b/src/region.js
index eec384a..f6a9601 100644
--- a/src/region.js
+++ b/src/region.js
@@ -7,7 +7,7 @@ c3_chart_internal_fn.initRegion = function () {
 c3_chart_internal_fn.redrawRegion = function (duration) {
     var $$ = this, config = $$.config, CLASS = $$.CLASS;
     $$.mainRegion = $$.main.select('.' + CLASS[_regions]).selectAll('.' + CLASS[_region])
-        .data(config[__regions]);
+        .data(config.regions);
     $$.mainRegion.enter().append('g')
         .attr('class', $$.classRegion.bind($$))
       .append('rect')
@@ -33,9 +33,9 @@ c3_chart_internal_fn.regionX = function (d) {
     var $$ = this, config = $$.config,
         xPos, yScale = d.axis === 'y' ? $$.y : $$.y2;
     if (d.axis === 'y' || d.axis === 'y2') {
-        xPos = config[__axis_rotated] ? ('start' in d ? yScale(d.start) : 0) : 0;
+        xPos = config.axis_rotated ? ('start' in d ? yScale(d.start) : 0) : 0;
     } else {
-        xPos = config[__axis_rotated] ? 0 : ('start' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.start) : d.start) : 0);
+        xPos = config.axis_rotated ? 0 : ('start' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.start) : d.start) : 0);
     }
     return xPos;
 };
@@ -43,9 +43,9 @@ c3_chart_internal_fn.regionY = function (d) {
     var $$ = this, config = $$.config,
         yPos, yScale = d.axis === 'y' ? $$.y : $$.y2;
     if (d.axis === 'y' || d.axis === 'y2') {
-        yPos = config[__axis_rotated] ? 0 : ('end' in d ? yScale(d.end) : 0);
+        yPos = config.axis_rotated ? 0 : ('end' in d ? yScale(d.end) : 0);
     } else {
-        yPos = config[__axis_rotated] ? ('start' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.start) : d.start) : 0) : 0;
+        yPos = config.axis_rotated ? ('start' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.start) : d.start) : 0) : 0;
     }
     return yPos;
 };
@@ -53,9 +53,9 @@ c3_chart_internal_fn.regionWidth = function (d) {
     var $$ = 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;
+        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) : $$.width);
+        end = config.axis_rotated ? $$.width : ('end' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.end) : d.end) : $$.width);
     }
     return end < start ? 0 : end - start;
 };
@@ -63,9 +63,9 @@ 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);
+        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) : $$.height;
+        end = config.axis_rotated ? ('end' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.end) : d.end) : $$.height) : $$.height;
     }
     return end < start ? 0 : end - start;
 };
diff --git a/src/scale.js b/src/scale.js
index deca515..49dbfac 100644
--- a/src/scale.js
+++ b/src/scale.js
@@ -53,14 +53,14 @@ 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] ? $$.width : 1;
+    $$.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] ? $$.width2 : 1;
+    $$.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());
@@ -70,15 +70,15 @@ c3_chart_internal_fn.updateScales = function () {
     $$.subY2 = $$.getY($$.subYMin, $$.subYMax, forInit ? undefined : $$.subY2.domain());
     // update axes
     $$.xAxisTickFormat = $$.getXAxisTickFormat();
-    $$.xAxisTickValues = config[__axis_x_tick_values] ? config[__axis_x_tick_values] : (forInit ? undefined : $$.xAxis.tickValues());
+    $$.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, $$.y2Orient, config[__axis_y2_tick_format], config[__axis_y2_ticks]);
+    $$.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); }
+        if (config.zoom_enabled) { $$.zoom.scale($$.x); }
     }
     // update for arc
     if ($$.updateArc) { $$.updateArc(); }
diff --git a/src/selection.js b/src/selection.js
index 8ae1e48..6746087 100644
--- a/src/selection.js
+++ b/src/selection.js
@@ -1,9 +1,9 @@
 c3_chart_internal_fn.selectPoint = function (target, d, i) {
     var $$ = this, config = $$.config,
-        cx = (config[__axis_rotated] ? $$.circleY : $$.circleX).bind($$),
-        cy = (config[__axis_rotated] ? $$.circleX : $$.circleY).bind($$),
+        cx = (config.axis_rotated ? $$.circleY : $$.circleX).bind($$),
+        cy = (config.axis_rotated ? $$.circleX : $$.circleY).bind($$),
         r = $$.pointSelectR.bind($$);
-    config[__data_onselected].call($$.api, d, target.node());
+    config.data_onselected.call($$.api, d, target.node());
     // add selected-circle on low layer g
     $$.main.select('.' + CLASS[_selectedCircles] + $$.getTargetSelectorSuffix(d.id)).selectAll('.' + CLASS[_selectedCircle] + '-' + i)
         .data([d])
@@ -18,7 +18,7 @@ c3_chart_internal_fn.selectPoint = function (target, d, i) {
 };
 c3_chart_internal_fn.unselectPoint = function (target, d, i) {
     var $$ = this;
-    $$.config[__data_onunselected](d, target.node());
+    $$.config.data_onunselected(d, target.node());
     // remove selected-circle from low layer g
     $$.main.select('.' + CLASS[_selectedCircles] + $$.getTargetSelectorSuffix(d.id)).selectAll('.' + CLASS[_selectedCircle] + '-' + i)
         .transition().duration(100).attr('r', 0)
@@ -29,13 +29,13 @@ c3_chart_internal_fn.togglePoint = function (selected, target, d, i) {
 };
 c3_chart_internal_fn.selectBar = function (target, d) {
     var $$ = this;
-    $$.config[__data_onselected].call($$, d, target.node());
+    $$.config.data_onselected.call($$, d, target.node());
     target.transition().duration(100)
         .style("fill", function () { return $$.d3.rgb($$.color(d)).brighter(0.75); });
 };
 c3_chart_internal_fn.unselectBar = function (target, d) {
     var $$ = this;
-    $$.config[__data_onunselected].call($$, d, target.node());
+    $$.config.data_onunselected.call($$, d, target.node());
     target.transition().duration(100)
         .style("fill", function () { return $$.color(d); });
 };
@@ -66,10 +66,10 @@ c3_chart_internal_fn.toggleShape = function (that, d, i) {
             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] ? $$.getTargetSelectorSuffix(d.id) : "")).selectAll('.' + CLASS[_shape]).each(function (d, i) {
+    if (config.data_selection_grouped || isWithin) {
+        if (config.data_selection_enabled && config.data_selection_isselectable(d)) {
+            if (!config.data_selection_multiple) {
+                $$.main.selectAll('.' + CLASS[_shapes] + (config.data_selection_grouped ? $$.getTargetSelectorSuffix(d.id) : "")).selectAll('.' + CLASS[_shape]).each(function (d, i) {
                     var shape = d3.select(this);
                     if (shape.classed(CLASS[_SELECTED])) { toggle.call($$, false, shape.classed(CLASS[_SELECTED], false), d, i); }
                 });
@@ -77,6 +77,6 @@ c3_chart_internal_fn.toggleShape = function (that, d, i) {
             shape.classed(CLASS[_SELECTED], !isSelected);
             toggle.call($$, !isSelected, shape, d, i);
         }
-        $$.config[__data_onclick].call($$.api, d, that);
+        $$.config.data_onclick.call($$.api, d, that);
     }
 };
diff --git a/src/shape.bar.js b/src/shape.bar.js
index 0c82f38..195eeb2 100644
--- a/src/shape.bar.js
+++ b/src/shape.bar.js
@@ -18,7 +18,7 @@ c3_chart_internal_fn.updateTargetsForBar = function (targets) {
     // Bars for each data
     mainBarEnter.append('g')
         .attr("class", classBars)
-        .style("cursor", function (d) { return config[__data_selection_isselectable](d) ? "pointer" : null; });
+        .style("cursor", function (d) { return config.data_selection_isselectable(d) ? "pointer" : null; });
 
 };
 c3_chart_internal_fn.redrawBar = function (durationForExit) {
@@ -48,8 +48,8 @@ c3_chart_internal_fn.addTransitionForBar = function (transitions, drawBar) {
 };
 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;
+        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;
 };
 c3_chart_internal_fn.getBars = function (i) {
     var $$ = this;
@@ -71,8 +71,8 @@ c3_chart_internal_fn.generateDrawBar = function (barIndices, isSub) {
         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 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] + ' ' +
@@ -96,7 +96,7 @@ c3_chart_internal_fn.generateGetBarPoints = function (barIndices, isSub) {
             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 ($$.config[__axis_rotated]) {
+        if ($$.config.axis_rotated) {
             if ((0 < d.value && posY < y0) || (d.value < 0 && y0 < posY)) { posY = y0; }
         }
         // 4 points that make a bar
diff --git a/src/shape.js b/src/shape.js
index d6b7fd7..14fc156 100644
--- a/src/shape.js
+++ b/src/shape.js
@@ -2,11 +2,11 @@ c3_chart_internal_fn.getShapeIndices = function (typeFilter) {
     var $$ = this, config = $$.config,
         indices = {}, i = 0, j, k;
     $$.filterTargetsToShow($$.data.targets.filter(typeFilter, $$)).forEach(function (d) {
-        for (j = 0; j < config[__data_groups].length; j++) {
-            if (config[__data_groups][j].indexOf(d.id) < 0) { continue; }
-            for (k = 0; k < config[__data_groups][j].length; k++) {
-                if (config[__data_groups][j][k] in indices) {
-                    indices[d.id] = indices[config[__data_groups][j][k]];
+        for (j = 0; j < config.data_groups.length; j++) {
+            if (config.data_groups[j].indexOf(d.id) < 0) { continue; }
+            for (k = 0; k < config.data_groups[j].length; k++) {
+                if (config.data_groups[j][k] in indices) {
+                    indices[d.id] = indices[config.data_groups[j][k]];
                     break;
                 }
             }
diff --git a/src/shape.line.js b/src/shape.line.js
index e487f20..7b55175 100644
--- a/src/shape.line.js
+++ b/src/shape.line.js
@@ -28,7 +28,7 @@ c3_chart_internal_fn.updateTargetsForLine = function (targets) {
         .attr("class", function (d) { return $$.generateClass(CLASS[_selectedCircles], d.id); });
     mainLineEnter.append('g')
         .attr("class", classCircles)
-        .style("cursor", function (d) { return config[__data_selection_isselectable](d) ? "pointer" : null; });
+        .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) {
@@ -66,17 +66,17 @@ c3_chart_internal_fn.generateDrawLine = function (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);
+            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; }); }
+    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] ? $$.filterRemoveNull(d.values) : d.values,
+        var data = config.line_connect_null ? $$.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 = $$.lineWithRegions(data, x, y, config[__data_regions][d.id]);
+            if (config.data_regions[d.id]) {
+                path = $$.lineWithRegions(data, x, y, config.data_regions[d.id]);
             } else {
                 path = line.interpolate($$.getInterpolate(d))(data);
             }
@@ -85,7 +85,7 @@ c3_chart_internal_fn.generateDrawLine = function (lineIndices, isSub) {
                 x0 = x(data[0].x);
                 y0 = y(data[0].value);
             }
-            path = config[__axis_rotated] ? "M " + y0 + " " + x0 : "M " + x0 + " " + y0;
+            path = config.axis_rotated ? "M " + y0 + " " + x0 : "M " + x0 + " " + y0;
         }
         return path ? path : "M 0 0";
     };
@@ -102,7 +102,7 @@ c3_chart_internal_fn.generateGetLinePoint = function (lineIndices, isSub) { // p
             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 (config.axis_rotated) {
             if ((0 < d.value && posY < y0) || (d.value < 0 && y0 < posY)) { posY = y0; }
         }
         // 1 point that marks the line position
@@ -147,8 +147,8 @@ c3_chart_internal_fn.lineWithRegions = function (d, x, y, _regions) {
     }
 
     // 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); };
+    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 ($$.isTimeSeries()) {
@@ -220,19 +220,19 @@ c3_chart_internal_fn.generateDrawArea = function (areaIndices, isSub) {
         yScaleGetter = isSub ? $$.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($$, d.id)(0);
+            return config.data_groups.length > 0 ? getPoint(d, i)[0][1] : yScaleGetter.call($$, d.id)(0);
         },
         value1 = function (d, i) {
-            return config[__data_groups].length > 0 ? getPoint(d, i)[1][1] : yScaleGetter.call($$, d.id)(d.value);
+            return config.data_groups.length > 0 ? getPoint(d, i)[1][1] : yScaleGetter.call($$, d.id)(d.value);
         };
 
-    area = config[__axis_rotated] ? area.x0(value0).x1(value1).y(xValue) : area.x(xValue).y0(value0).y1(value1);
-    if (!config[__line_connect_null]) {
+    area = config.axis_rotated ? area.x0(value0).x1(value1).y(xValue) : area.x(xValue).y0(value0).y1(value1);
+    if (!config.line_connect_null) {
         area = area.defined(function (d) { return d.value !== null; });
     }
 
     return function (d) {
-        var data = config[__line_connect_null] ? $$.filterRemoveNull(d.values) : d.values, x0 = 0, y0 = 0, path;
+        var data = config.line_connect_null ? $$.filterRemoveNull(d.values) : d.values, x0 = 0, y0 = 0, path;
         if ($$.isAreaType(d)) {
             path = area.interpolate($$.getInterpolate(d))(data);
         } else {
@@ -240,7 +240,7 @@ c3_chart_internal_fn.generateDrawArea = function (areaIndices, isSub) {
                 x0 = $$.x(data[0].x);
                 y0 = $$.getYScale(d.id)(data[0].value);
             }
-            path = config[__axis_rotated] ? "M " + y0 + " " + x0 : "M " + x0 + " " + y0;
+            path = config.axis_rotated ? "M " + y0 + " " + x0 : "M " + x0 + " " + y0;
         }
         return path ? path : "M 0 0";
     };
@@ -258,7 +258,7 @@ c3_chart_internal_fn.generateGetAreaPoint = function (areaIndices, isSub) { // p
             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 (config.axis_rotated) {
             if ((0 < d.value && posY < y0) || (d.value < 0 && y0 < posY)) { posY = y0; }
         }
         // 1 point that marks the area position
@@ -299,7 +299,7 @@ c3_chart_internal_fn.circleX = function (d) {
 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);
+    return $$.config.data_groups.length > 0 ? getPoint(d, i)[0][1] : $$.getYScale(d.id)(d.value);
 };
 c3_chart_internal_fn.getCircles = function (i, id) {
     var $$ = this;
@@ -322,15 +322,15 @@ c3_chart_internal_fn.unexpandCircles = function (i) {
 };
 c3_chart_internal_fn.pointR = function (d) {
     var $$ = this, config = $$.config;
-    return config[__point_show] && !$$.isStepType(d) ? (isFunction(config[__point_r]) ? config[__point_r](d) : config[__point_r]) : 0;
+    return config.point_show && !$$.isStepType(d) ? (isFunction(config.point_r) ? config.point_r(d) : config.point_r) : 0;
 };
 c3_chart_internal_fn.pointExpandedR = function (d) {
     var $$ = this, config = $$.config;
-    return config[__point_focus_expand_enabled] ? (config[__point_focus_expand_r] ? config[__point_focus_expand_r] : $$.pointR(d) * 1.75) : $$.pointR(d);
+    return config.point_focus_expand_enabled ? (config.point_focus_expand_r ? config.point_focus_expand_r : $$.pointR(d) * 1.75) : $$.pointR(d);
 };
 c3_chart_internal_fn.pointSelectR = function (d) {
     var $$ = this, config = $$.config;
-    return config[__point_select_r] ? config[__point_select_r] : $$.pointR(d) * 4;
+    return config.point_select_r ? config.point_select_r : $$.pointR(d) * 4;
 };
 c3_chart_internal_fn.isWithinCircle = function (_this, _r) {
     var d3 = this.d3,
diff --git a/src/size.js b/src/size.js
index ad3b2cb..9c12c79 100644
--- a/src/size.js
+++ b/src/size.js
@@ -1,39 +1,39 @@
 c3_chart_internal_fn.getCurrentWidth = function () {
     var $$ = this, config = $$.config;
-    return config[__size_width] ? config[__size_width] : $$.getParentWidth();
+    return config.size_width ? config.size_width : $$.getParentWidth();
 };
 c3_chart_internal_fn.getCurrentHeight = function () {
     var $$ = this, config = $$.config,
-        h = config[__size_height] ? config[__size_height] : $$.getParentHeight();
+        h = config.size_height ? config.size_height : $$.getParentHeight();
     return h > 0 ? h : 320;
 };
 c3_chart_internal_fn.getCurrentPaddingTop = function () {
     var config = this.config;
-    return isValue(config[__padding_top]) ? config[__padding_top] : 0;
+    return isValue(config.padding_top) ? config.padding_top : 0;
 };
 c3_chart_internal_fn.getCurrentPaddingBottom = function () {
     var config = this.config;
-    return isValue(config[__padding_bottom]) ? config[__padding_bottom] : 0;
+    return isValue(config.padding_bottom) ? config.padding_bottom : 0;
 };
 c3_chart_internal_fn.getCurrentPaddingLeft = function () {
     var $$ = 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);
+    if (isValue(config.padding_left)) {
+        return config.padding_left;
+    } else if (config.axis_rotated) {
+        return !config.axis_x_show ? 1 : Math.max(ceil10($$.getAxisWidthByAxisId('x')), 40);
     } else {
-        return !config[__axis_y_show] ? 1 : ceil10($$.getAxisWidthByAxisId('y'));
+        return !config.axis_y_show ? 1 : ceil10($$.getAxisWidthByAxisId('y'));
     }
 };
 c3_chart_internal_fn.getCurrentPaddingRight = function () {
     var $$ = this, config = $$.config,
         defaultPadding = 10, legendWidthOnRight = $$.isLegendRight ? $$.getLegendWidth() + 20 : 0;
-    if (isValue(config[__padding_right])) {
-        return config[__padding_right] + 1; // 1 is needed not to hide tick line
-    } else if (config[__axis_rotated]) {
+    if (isValue(config.padding_right)) {
+        return config.padding_right + 1; // 1 is needed not to hide tick line
+    } else if (config.axis_rotated) {
         return defaultPadding + legendWidthOnRight;
     } else {
-        return (!config[__axis_y2_show] ? defaultPadding : ceil10($$.getAxisWidthByAxisId('y2'))) + legendWidthOnRight;
+        return (!config.axis_y2_show ? defaultPadding : ceil10($$.getAxisWidthByAxisId('y2'))) + legendWidthOnRight;
     }
 };
 
@@ -59,7 +59,7 @@ c3_chart_internal_fn.getParentHeight = function () {
 
 c3_chart_internal_fn.getSvgLeft = function () {
     var $$ = this, config = $$.config,
-        leftAxisClass = config[__axis_rotated] ? CLASS[_axisX] : CLASS[_axisY],
+        leftAxisClass = config.axis_rotated ? CLASS[_axisX] : CLASS[_axisY],
         leftAxis = $$.main.select('.' + leftAxisClass).node(),
         svgRect = leftAxis ? leftAxis.getBoundingClientRect() : {right: 0},
         chartRect = $$.selectChart.node().getBoundingClientRect(),
@@ -75,10 +75,10 @@ c3_chart_internal_fn.getAxisWidthByAxisId = function (id) {
 };
 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 $$.rotated_padding_top; }
+    if (axisId === 'x' && !config.axis_x_show) { return 0; }
+    if (axisId === 'x' && config.axis_x_height) { return config.axis_x_height; }
+    if (axisId === 'y' && !config.axis_y_show) { return config.legend_show && !$$.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);
 };
 
@@ -92,7 +92,7 @@ c3_chart_internal_fn.getEventRectWidth = function () {
     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 : $$.width;
+        return $$.config.axis_rotated ? $$.height : $$.width;
     }
     maxDataCount = $$.getMaxDataCount();
     ratio = ($$.hasType('bar') ? (maxDataCount - ($$.isCategorized() ? 0.25 : 1)) / maxDataCount : 1);
diff --git a/src/subchart.js b/src/subchart.js
index 3781136..da089de 100644
--- a/src/subchart.js
+++ b/src/subchart.js
@@ -6,14 +6,14 @@ c3_chart_internal_fn.initBrush = function () {
         return this;
     };
     $$.brush.scale = function (scale) {
-        return $$.config[__axis_rotated] ? this.y(scale) : this.x(scale);
+        return $$.config.axis_rotated ? this.y(scale) : this.x(scale);
     };
 };
 c3_chart_internal_fn.initSubchart = function () {
     var $$ = this, config = $$.config,
         context = $$.context = $$.svg.append("g").attr("transform", $$.getTranslate('context'));
 
-    if (!config[__subchart_show]) {
+    if (!config.subchart_show) {
         context.style('visibility', 'hidden');
     }
 
@@ -36,14 +36,14 @@ c3_chart_internal_fn.initSubchart = function () {
         .attr("class", CLASS[_brush])
         .call($$.brush)
         .selectAll("rect")
-        .attr(config[__axis_rotated] ? "width" : "height", config[__axis_rotated] ? $$.width2 : $$.height2);
+        .attr(config.axis_rotated ? "width" : "height", config.axis_rotated ? $$.width2 : $$.height2);
 
     // ATTENTION: This must be called AFTER chart added
     // Add Axis
     $$.axes.subx = context.append("g")
         .attr("class", CLASS[_axisX])
         .attr("transform", $$.getTranslate('subx'))
-        .attr("clip-path", config[__axis_rotated] ? "" : $$.clipPathForXAxis);
+        .attr("clip-path", config.axis_rotated ? "" : $$.clipPathForXAxis);
 };
 c3_chart_internal_fn.updateTargetsForSubchart = function (targets) {
     var $$ = this, context = $$.context, config = $$.config,
@@ -54,7 +54,7 @@ c3_chart_internal_fn.updateTargetsForSubchart = function (targets) {
         classLines = $$.classLines.bind($$),
         classAreas = $$.classAreas.bind($$);
 
-    if (config[__subchart_show]) {
+    if (config.subchart_show) {
         contextBarUpdate = context.select('.' + CLASS[_chartBars]).selectAll('.' + CLASS[_chartBar])
             .data(targets)
             .attr('class', classChartBar);
@@ -91,7 +91,7 @@ c3_chart_internal_fn.redrawSubchart = function (withSubchart, transitions, durat
         initialOpacity = $$.initialOpacity.bind($$);
 
     // subchart
-    if (config[__subchart_show]) {
+    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();
@@ -100,8 +100,8 @@ c3_chart_internal_fn.redrawSubchart = function (withSubchart, transitions, durat
         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]);
+            if (!config.axis_rotated && config.axis_x_tick_rotate) {
+                $$.rotateTickText($$.axes.subx, transitions.axisSubX, config.axis_x_tick_rotate);
             }
 
             // extent rect
@@ -168,7 +168,7 @@ c3_chart_internal_fn.redrawForBrush = function () {
         withSubchart: false,
         withUpdateXDomain: true
     });
-    $$.config[__subchart_onbrush].call($$.api, x.orgDomain());
+    $$.config.subchart_onbrush.call($$.api, x.orgDomain());
 };
 c3_chart_internal_fn.transformContext = function (withTransition, transitions) {
     var $$ = this, subXAxis;
diff --git a/src/text.js b/src/text.js
index ad9ccc3..55a2615 100644
--- a/src/text.js
+++ b/src/text.js
@@ -26,7 +26,7 @@ c3_chart_internal_fn.redrawText = function (durationForExit) {
         .data(barOrLineData);
     $$.mainText.enter().append('text')
         .attr("class", classText)
-        .attr('text-anchor', function (d) { return config[__axis_rotated] ? (d.value < 0 ? 'end' : 'start') : 'middle'; })
+        .attr('text-anchor', function (d) { return config.axis_rotated ? (d.value < 0 ? 'end' : 'start') : 'middle'; })
         .style("stroke", 'none')
         .style("fill", function (d) { return $$.color(d); })
         .style("fill-opacity", 0);
@@ -68,7 +68,7 @@ c3_chart_internal_fn.generateXYForText = function (barIndices, forX) {
 c3_chart_internal_fn.getXForText = function (points, d, textElement) {
     var $$ = this,
         box = textElement.getBoundingClientRect(), xPos, padding;
-    if ($$.config[__axis_rotated]) {
+    if ($$.config.axis_rotated) {
         padding = $$.isBarType(d) ? 4 : 6;
         xPos = points[2][1] + padding * (d.value < 0 ? -1 : 1);
     } else {
@@ -79,7 +79,7 @@ c3_chart_internal_fn.getXForText = function (points, d, textElement) {
 c3_chart_internal_fn.getYForText = function (points, d, textElement) {
     var $$ = this,
         box = textElement.getBoundingClientRect(), yPos;
-    if ($$.config[__axis_rotated]) {
+    if ($$.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 : $$.isBarType(d) ? -3 : -6);
diff --git a/src/tooltip.js b/src/tooltip.js
index 58a4364..c960f8b 100644
--- a/src/tooltip.js
+++ b/src/tooltip.js
@@ -8,27 +8,27 @@ c3_chart_internal_fn.initTooltip = function () {
         .style("z-index", "10")
         .style("display", "none");
     // Show tooltip if needed
-    if (config[__tooltip_init_show]) {
-        if ($$.isTimeSeries() && isString(config[__tooltip_init_x])) {
-            config[__tooltip_init_x] = $$.parseDate(config[__tooltip_init_x]);
+    if (config.tooltip_init_show) {
+        if ($$.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 (($$.data.targets[0].values[i].x - config[__tooltip_init_x]) === 0) { break; }
+                if (($$.data.targets[0].values[i].x - config.tooltip_init_x) === 0) { break; }
             }
-            config[__tooltip_init_x] = i;
+            config.tooltip_init_x = i;
         }
-        $$.tooltip.html(config[__tooltip_contents].call($$, $$.data.targets.map(function (d) {
-            return $$.addName(d.values[config[__tooltip_init_x]]);
+        $$.tooltip.html(config.tooltip_contents.call($$, $$.data.targets.map(function (d) {
+            return $$.addName(d.values[config.tooltip_init_x]);
         }), $$.getXAxisTickFormat(), $$.getYFormat($$.hasArcType()), $$.color));
-        $$.tooltip.style("top", config[__tooltip_init_position].top)
-            .style("left", config[__tooltip_init_position].left)
+        $$.tooltip.style("top", config.tooltip_init_position.top)
+            .style("left", config.tooltip_init_position.left)
             .style("display", "block");
     }
 };
 c3_chart_internal_fn.getTooltipContent = function (d, defaultTitleFormat, defaultValueFormat, color) {
     var $$ = this, config = $$.config,
-        titleFormat = config[__tooltip_format_title] || defaultTitleFormat,
-        nameFormat = config[__tooltip_format_name] || function (name) { return name; },
-        valueFormat = config[__tooltip_format_value] || defaultValueFormat,
+        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; }
@@ -54,10 +54,10 @@ c3_chart_internal_fn.showTooltip = function (selectedData, mouse) {
     var tWidth, tHeight, svgLeft, tooltipLeft, tooltipRight, tooltipTop, chartRight;
     var forArc = $$.hasArcType(),
         dataToShow = selectedData.filter(function (d) { return d && isValue(d.value); });
-    if (dataToShow.length === 0 || !config[__tooltip_show]) {
+    if (dataToShow.length === 0 || !config.tooltip_show) {
         return;
     }
-    $$.tooltip.html(config[__tooltip_contents].call($$, selectedData, $$.getXAxisTickFormat(), $$.getYFormat(forArc), $$.color)).style("display", "block");
+    $$.tooltip.html(config.tooltip_contents.call($$, selectedData, $$.getXAxisTickFormat(), $$.getYFormat(forArc), $$.color)).style("display", "block");
 
     // Get tooltip dimensions
     tWidth = $$.tooltip.property('offsetWidth');
@@ -67,7 +67,7 @@ c3_chart_internal_fn.showTooltip = function (selectedData, mouse) {
         tooltipLeft = ($$.width / 2) + mouse[0];
         tooltipTop = ($$.height / 2) + mouse[1] + 20;
     } else {
-        if (config[__axis_rotated]) {
+        if (config.axis_rotated) {
             svgLeft = $$.getSvgLeft();
             tooltipLeft = svgLeft + mouse[0] + 100;
             tooltipRight = tooltipLeft + tWidth;
diff --git a/src/type.js b/src/type.js
index bd7217a..e08b04d 100644
--- a/src/type.js
+++ b/src/type.js
@@ -1,15 +1,15 @@
 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;
+        $$.withoutFadeIn[id] = (type === config.data_types[id]);
+        config.data_types[id] = type;
     });
     if (!targetIds) {
-        config[__data_type] = type;
+        config.data_type = type;
     }
 };
 c3_chart_internal_fn.hasType = function (type, targets) {
-    var $$ = this, types = $$.config[__data_types], has = false;
+    var $$ = this, types = $$.config.data_types, has = false;
     (targets || $$.data.targets).forEach(function (t) {
         if ((types[t.id] && types[t.id].indexOf(type) >= 0) || (!(t.id in types) && type === 'line')) {
             has = true;
@@ -22,39 +22,39 @@ c3_chart_internal_fn.hasArcType = function (targets) {
 };
 c3_chart_internal_fn.isLineType = function (d) {
     var config = this.config, id = isString(d) ? d : d.id;
-    return !config[__data_types][id] || ['line', 'spline', 'area', 'area-spline', 'step', 'area-step'].indexOf(config[__data_types][id]) >= 0;
+    return !config.data_types[id] || ['line', 'spline', 'area', 'area-spline', 'step', 'area-step'].indexOf(config.data_types[id]) >= 0;
 };
 c3_chart_internal_fn.isStepType = function (d) {
     var id = isString(d) ? d : d.id;
-    return ['step', 'area-step'].indexOf(this.config[__data_types][id]) >= 0;
+    return ['step', 'area-step'].indexOf(this.config.data_types[id]) >= 0;
 };
 c3_chart_internal_fn.isSplineType = function (d) {
     var id = isString(d) ? d : d.id;
-    return ['spline', 'area-spline'].indexOf(this.config[__data_types][id]) >= 0;
+    return ['spline', 'area-spline'].indexOf(this.config.data_types[id]) >= 0;
 };
 c3_chart_internal_fn.isAreaType = function (d) {
     var id = isString(d) ? d : d.id;
-    return ['area', 'area-spline', 'area-step'].indexOf(this.config[__data_types][id]) >= 0;
+    return ['area', 'area-spline', 'area-step'].indexOf(this.config.data_types[id]) >= 0;
 };
 c3_chart_internal_fn.isBarType = function (d) {
     var id = isString(d) ? d : d.id;
-    return this.config[__data_types][id] === 'bar';
+    return this.config.data_types[id] === 'bar';
 };
 c3_chart_internal_fn.isScatterType = function (d) {
     var id = isString(d) ? d : d.id;
-    return this.config[__data_types][id] === 'scatter';
+    return this.config.data_types[id] === 'scatter';
 };
 c3_chart_internal_fn.isPieType = function (d) {
     var id = isString(d) ? d : d.id;
-    return this.config[__data_types][id] === 'pie';
+    return this.config.data_types[id] === 'pie';
 };
 c3_chart_internal_fn.isGaugeType = function (d) {
     var id = isString(d) ? d : d.id;
-    return this.config[__data_types][id] === 'gauge';
+    return this.config.data_types[id] === 'gauge';
 };
 c3_chart_internal_fn.isDonutType = function (d) {
     var id = isString(d) ? d : d.id;
-    return this.config[__data_types][id] === 'donut';
+    return this.config.data_types[id] === 'donut';
 };
 c3_chart_internal_fn.isArcType = function (d) {
     return this.isPieType(d) || this.isDonutType(d) || this.isGaugeType(d);
diff --git a/src/zoom.js b/src/zoom.js
index 0a4c236..43ef248 100644
--- a/src/zoom.js
+++ b/src/zoom.js
@@ -6,10 +6,10 @@ c3_chart_internal_fn.initZoom = function () {
         })
         .on("zoom", function () { $$.redrawForZoom.call($$); });
     $$.zoom.scale = function (scale) {
-        return config[__axis_rotated] ? this.y(scale) : this.x(scale);
+        return config.axis_rotated ? this.y(scale) : this.x(scale);
     };
     $$.zoom.orgScaleExtent = function () {
-        var extent = config[__zoom_extent] ? config[__zoom_extent] : [1, 10];
+        var extent = config.zoom_extent ? config.zoom_extent : [1, 10];
         return [extent[0], Math.max($$.getMaxDataCount() / extent[1], extent[1])];
     };
     $$.zoom.updateScaleExtent = function () {
@@ -20,13 +20,13 @@ c3_chart_internal_fn.initZoom = function () {
     };
 };
 c3_chart_internal_fn.updateZoom = function () {
-    var $$ = this, z = $$.config[__zoom_enabled] ? $$.zoom : function () {};
+    var $$ = this, z = $$.config.zoom_enabled ? $$.zoom : function () {};
     $$.main.select('.' + $$.CLASS[_zoomRect]).call(z);
     $$.main.selectAll('.' + $$.CLASS[_eventRect]).call(z);
 };
 c3_chart_internal_fn.redrawForZoom = function () {
     var $$ = this, d3 = $$.d3, config = $$.config, zoom = $$.zoom, x = $$.x, orgXDomain = $$.orgXDomain;
-    if (!config[__zoom_enabled]) {
+    if (!config.zoom_enabled) {
         return;
     }
     if ($$.filterTargetsToShow($$.data.targets).length === 0) {
@@ -48,5 +48,5 @@ c3_chart_internal_fn.redrawForZoom = function () {
     if (d3.event.sourceEvent.type === 'mousemove') {
         $$.cancelClick = true;
     }
-    config[__zoom_onzoom].call($$.api, x.orgDomain());
+    config.zoom_onzoom.call($$.api, x.orgDomain());
 };