text: (function (window) {
      'use strict';
  
      /*global define, module, exports, require */
  
      var c3 = { version: "0.4.10-rc4" };
  
      var c3_chart_fn,
          c3_chart_internal_fn,
          c3_chart_internal_axis_fn;
  
      function API(owner) {
          this.owner = owner;
      }
  
      function inherit(base, derived) {
  
          if (Object.create) {
              derived.prototype = Object.create(base.prototype);
          } else {
              var f = function f() {};
              f.prototype = base.prototype;
              derived.prototype = new f();
          }
  
          derived.prototype.constructor = derived;
  
          return derived;
      }
  
      function Chart(config) {
          var $$ = this.internal = new ChartInternal(this);
          $$.loadConfig(config);
          $$.init();
  
          // bind "this" to nested API
          (function bindThis(fn, target, argThis) {
              Object.keys(fn).forEach(function (key) {
                  target[key] = fn[key].bind(argThis);
                  if (Object.keys(fn[key]).length > 0) {
                      bindThis(fn[key], target[key], argThis);
                  }
              });
          })(c3_chart_fn, this, this);
      }
  
      function ChartInternal(api) {
          var $$ = this;
          $$.d3 = window.d3 ? window.d3 : typeof require !== 'undefined' ? require("d3") : undefined;
          $$.api = api;
          $$.config = $$.getDefaultConfig();
          $$.data = {};
          $$.cache = {};
          $$.axes = {};
      }
  
      c3.generate = function (config) {
          return new Chart(config);
      };
  
      c3.chart = {
          fn: Chart.prototype,
          internal: {
              fn: ChartInternal.prototype,
              axis: {
                  fn: Axis.prototype
              }
          }
      };
      c3_chart_fn = c3.chart.fn;
      c3_chart_internal_fn = c3.chart.internal.fn;
      c3_chart_internal_axis_fn = c3.chart.internal.axis.fn;
  
      c3_chart_internal_fn.init = function () {
          var $$ = this, config = $$.config;
  
          $$.initParams();
  
          if (config.data_url) {
              $$.convertUrlToData(config.data_url, config.data_mimeType, config.data_keys, $$.initWithData);
          }
          else if (config.data_json) {
              $$.initWithData($$.convertJsonToData(config.data_json, config.data_keys));
          }
          else if (config.data_rows) {
              $$.initWithData($$.convertRowsToData(config.data_rows));
          }
          else if (config.data_columns) {
              $$.initWithData($$.convertColumnsToData(config.data_columns));
          }
          else {
              throw Error('url or json or rows or columns is required.');
          }
      };
  
      c3_chart_internal_fn.initParams = function () {
          var $$ = this, d3 = $$.d3, config = $$.config;
  
          // MEMO: clipId needs to be unique because it conflicts when multiple charts exist
          $$.clipId = "c3-" + (+new Date()) + '-clip',
          $$.clipIdForXAxis = $$.clipId + '-xaxis',
          $$.clipIdForYAxis = $$.clipId + '-yaxis',
          $$.clipIdForGrid = $$.clipId + '-grid',
          $$.clipIdForSubchart = $$.clipId + '-subchart',
          $$.clipPath = $$.getClipPath($$.clipId),
          $$.clipPathForXAxis = $$.getClipPath($$.clipIdForXAxis),
          $$.clipPathForYAxis = $$.getClipPath($$.clipIdForYAxis);
          $$.clipPathForGrid = $$.getClipPath($$.clipIdForGrid),
          $$.clipPathForSubchart = $$.getClipPath($$.clipIdForSubchart),
  
          $$.dragStart = null;
          $$.dragging = false;
          $$.flowing = false;
          $$.cancelClick = false;
          $$.mouseover = false;
          $$.transiting = false;
  
          $$.color = $$.generateColor();
          $$.levelColor = $$.generateLevelColor();
  
          $$.dataTimeFormat = config.data_xLocaltime ? d3.time.format : d3.time.format.utc;
          $$.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(); }],
              ["%I:%M", function (d) { return d.getMinutes(); }],
              ["%I %p", function (d) { return d.getHours(); }],
              ["%-m/%-d", function (d) { return d.getDay() && d.getDate() !== 1; }],
              ["%-m/%-d", function (d) { return d.getDate() !== 1; }],
              ["%-m/%-d", function (d) { return d.getMonth(); }],
              ["%Y/%-m/%-d", function () { return true; }]
          ]);
  
          $$.hiddenTargetIds = [];
          $$.hiddenLegendIds = [];
          $$.focusedTargetIds = [];
          $$.defocusedTargetIds = [];
  
          $$.xOrient = config.axis_rotated ? "left" : "bottom";
          $$.yOrient = config.axis_rotated ? (config.axis_y_inner ? "top" : "bottom") : (config.axis_y_inner ? "right" : "left");
          $$.y2Orient = config.axis_rotated ? (config.axis_y2_inner ? "bottom" : "top") : (config.axis_y2_inner ? "left" : "right");
          $$.subXOrient = config.axis_rotated ? "left" : "bottom";
  
          $$.isLegendRight = config.legend_position === 'right';
          $$.isLegendInset = config.legend_position === 'inset';
          $$.isLegendTop = config.legend_inset_anchor === 'top-left' || config.legend_inset_anchor === 'top-right';
          $$.isLegendLeft = config.legend_inset_anchor === 'top-left' || config.legend_inset_anchor === 'bottom-left';
          $$.legendStep = 0;
          $$.legendItemWidth = 0;
          $$.legendItemHeight = 0;
  
          $$.currentMaxTickWidths = {
              x: 0,
              y: 0,
              y2: 0
          };
  
          $$.rotated_padding_left = 30;
          $$.rotated_padding_right = config.axis_rotated && !config.axis_x_show ? 0 : 30;
          $$.rotated_padding_top = 5;
  
          $$.withoutFadeIn = {};
  
          $$.intervalForObserveInserted = undefined;
  
          $$.axes.subx = d3.selectAll([]); // needs when excluding subchart.js
      };
  
      c3_chart_internal_fn.initChartElements = function () {
          if (this.initBar) { this.initBar(); }
          if (this.initLine) { this.initLine(); }
          if (this.initArc) { this.initArc(); }
          if (this.initGauge) { this.initGauge(); }
          if (this.initText) { this.initText(); }
      };
  
      c3_chart_internal_fn.initWithData = function (data) {
          var $$ = this, d3 = $$.d3, config = $$.config;
          var defs, main, binding = true;
  
          $$.axis = new Axis($$);
  
          if ($$.initPie) { $$.initPie(); }
          if ($$.initBrush) { $$.initBrush(); }
          if ($$.initZoom) { $$.initZoom(); }
  
          if (!config.bindto) {
              $$.selectChart = d3.selectAll([]);
          }
          else if (typeof config.bindto.node === 'function') {
              $$.selectChart = config.bindto;
          }
          else {
              $$.selectChart = d3.select(config.bindto);
          }
          if ($$.selectChart.empty()) {
              $$.selectChart = d3.select(document.createElement('div')).style('opacity', 0);
              $$.observeInserted($$.selectChart);
              binding = false;
          }
          $$.selectChart.html("").classed("c3", true);
  
          // Init data as targets
          $$.data.xs = {};
          $$.data.targets = $$.convertDataToTargets(data);
  
          if (config.data_filter) {
              $$.data.targets = $$.data.targets.filter(config.data_filter);
          }
  
          // Set targets to hide if needed
          if (config.data_hide) {
              $$.addHiddenTargetIds(config.data_hide === true ? $$.mapToIds($$.data.targets) : config.data_hide);
          }
          if (config.legend_hide) {
              $$.addHiddenLegendIds(config.legend_hide === true ? $$.mapToIds($$.data.targets) : config.legend_hide);
          }
  
          // when gauge, hide legend // TODO: fix
          if ($$.hasType('gauge')) {
              config.legend_show = false;
          }
  
          // Init sizes and scales
          $$.updateSizes();
          $$.updateScales();
  
          // Set domains for each scale
          $$.x.domain(d3.extent($$.getXDomain($$.data.targets)));
          $$.y.domain($$.getYDomain($$.data.targets, 'y'));
          $$.y2.domain($$.getYDomain($$.data.targets, 'y2'));
          $$.subX.domain($$.x.domain());
          $$.subY.domain($$.y.domain());
          $$.subY2.domain($$.y2.domain());
  
          // Save original x domain for zoom update
          $$.orgXDomain = $$.x.domain();
  
          // Set initialized scales to brush and zoom
          if ($$.brush) { $$.brush.scale($$.subX); }
          if (config.zoom_enabled) { $$.zoom.scale($$.x); }
  
          /*-- Basic Elements --*/
  
          // Define svgs
          $$.svg = $$.selectChart.append("svg")
              .style("overflow", "hidden")
              .on('mouseenter', function () { return config.onmouseover.call($$); })
              .on('mouseleave', function () { return config.onmouseout.call($$); });
  
          // Define defs
          defs = $$.svg.append("defs");
          $$.clipChart = $$.appendClip(defs, $$.clipId);
          $$.clipXAxis = $$.appendClip(defs, $$.clipIdForXAxis);
          $$.clipYAxis = $$.appendClip(defs, $$.clipIdForYAxis);
          $$.clipGrid = $$.appendClip(defs, $$.clipIdForGrid);
          $$.clipSubchart = $$.appendClip(defs, $$.clipIdForSubchart);
          $$.updateSvgSize();
  
          // Define regions
          main = $$.main = $$.svg.append("g").attr("transform", $$.getTranslate('main'));
  
          if ($$.initSubchart) { $$.initSubchart(); }
          if ($$.initTooltip) { $$.initTooltip(); }
          if ($$.initLegend) { $$.initLegend(); }
  
          /*-- Main Region --*/
  
          // text when empty
          main.append("text")
              .attr("class", CLASS.text + ' ' + CLASS.empty)
              .attr("text-anchor", "middle") // horizontal centering of text at x position in all browsers.
              .attr("dominant-baseline", "middle"); // vertical centering of text at y position in all browsers, except IE.
  
          // Regions
          $$.initRegion();
  
          // Grids
          $$.initGrid();
  
          // Define g for chart area
          main.append('g')
              .attr("clip-path", $$.clipPath)
              .attr('class', CLASS.chart);
  
          // Grid lines
          if (config.grid_lines_front) { $$.initGridLines(); }
  
          // Cover whole with rects for events
          $$.initEventRect();
  
          // Define g for chart
          $$.initChartElements();
  
          // if zoom privileged, insert rect to forefront
          // TODO: is this needed?
          main.insert('rect', config.zoom_privileged ? null : 'g.' + CLASS.regions)
              .attr('class', CLASS.zoomRect)
              .attr('width', $$.width)
              .attr('height', $$.height)
              .style('opacity', 0)
              .on("dblclick.zoom", null);
  
          // Set default extent if defined
          if (config.axis_x_extent) { $$.brush.extent($$.getDefaultExtent()); }
  
          // Add Axis
          $$.axis.init();
  
          // Set targets
          $$.updateTargets($$.data.targets);
  
          // Draw with targets
          if (binding) {
              $$.updateDimension();
              $$.config.oninit.call($$);
              $$.redraw({
                  withTransition: false,
                  withTransform: true,
                  withUpdateXDomain: true,
                  withUpdateOrgXDomain: true,
                  withTransitionForAxis: false
              });
          }
  
          // Bind resize event
          if (window.onresize == null) {
              window.onresize = $$.generateResize();
          }
          if (window.onresize.add) {
              window.onresize.add(function () {
                  config.onresize.call($$);
              });
              window.onresize.add(function () {
                  $$.api.flush();
              });
              window.onresize.add(function () {
                  config.onresized.call($$);
              });
          }
  
          // export element of the chart
          $$.api.element = $$.selectChart.node();
      };
  
      c3_chart_internal_fn.smoothLines = function (el, type) {
          var $$ = this;
          if (type === 'grid') {
              el.each(function () {
                  var g = $$.d3.select(this),
                      x1 = g.attr('x1'),
                      x2 = g.attr('x2'),
                      y1 = g.attr('y1'),
                      y2 = g.attr('y2');
                  g.attr({
                      'x1': Math.ceil(x1),
                      'x2': Math.ceil(x2),
                      'y1': Math.ceil(y1),
                      'y2': Math.ceil(y2)
                  });
              });
          }
      };
  
  
      c3_chart_internal_fn.updateSizes = function () {
          var $$ = this, config = $$.config;
          var legendHeight = $$.legend ? $$.getLegendHeight() : 0,
              legendWidth = $$.legend ? $$.getLegendWidth() : 0,
              legendHeightForBottom = $$.isLegendRight || $$.isLegendInset ? 0 : legendHeight,
              hasArc = $$.hasArcType(),
              xAxisHeight = config.axis_rotated || hasArc ? 0 : $$.getHorizontalAxisHeight('x'),
              subchartHeight = config.subchart_show && !hasArc ? (config.subchart_size_height + xAxisHeight) : 0;
  
          $$.currentWidth = $$.getCurrentWidth();
          $$.currentHeight = $$.getCurrentHeight();
  
          // for main
          $$.margin = config.axis_rotated ? {
              top: $$.getHorizontalAxisHeight('y2') + $$.getCurrentPaddingTop(),
              right: hasArc ? 0 : $$.getCurrentPaddingRight(),
              bottom: $$.getHorizontalAxisHeight('y') + legendHeightForBottom + $$.getCurrentPaddingBottom(),
              left: subchartHeight + (hasArc ? 0 : $$.getCurrentPaddingLeft())
          } : {
              top: 4 + $$.getCurrentPaddingTop(), // for top tick text
              right: hasArc ? 0 : $$.getCurrentPaddingRight(),
              bottom: xAxisHeight + subchartHeight + legendHeightForBottom + $$.getCurrentPaddingBottom(),
              left: hasArc ? 0 : $$.getCurrentPaddingLeft()
          };
  
          // for subchart
          $$.margin2 = config.axis_rotated ? {
              top: $$.margin.top,
              right: NaN,
              bottom: 20 + legendHeightForBottom,
              left: $$.rotated_padding_left
          } : {
              top: $$.currentHeight - subchartHeight - legendHeightForBottom,
              right: NaN,
              bottom: xAxisHeight + legendHeightForBottom,
              left: $$.margin.left
          };
  
          // for legend
          $$.margin3 = {
              top: 0,
              right: NaN,
              bottom: 0,
              left: 0
          };
          if ($$.updateSizeForLegend) { $$.updateSizeForLegend(legendHeight, legendWidth); }
  
          $$.width = $$.currentWidth - $$.margin.left - $$.margin.right;
          $$.height = $$.currentHeight - $$.margin.top - $$.margin.bottom;
          if ($$.width < 0) { $$.width = 0; }
          if ($$.height < 0) { $$.height = 0; }
  
          $$.width2 = config.axis_rotated ? $$.margin.left - $$.rotated_padding_left - $$.rotated_padding_right : $$.width;
          $$.height2 = config.axis_rotated ? $$.height : $$.currentHeight - $$.margin2.top - $$.margin2.bottom;
          if ($$.width2 < 0) { $$.width2 = 0; }
          if ($$.height2 < 0) { $$.height2 = 0; }
  
          // for arc
          $$.arcWidth = $$.width - ($$.isLegendRight ? legendWidth + 10 : 0);
          $$.arcHeight = $$.height - ($$.isLegendRight ? 0 : 10);
          if ($$.hasType('gauge')) {
              $$.arcHeight += $$.height - $$.getGaugeLabelHeight();
          }
          if ($$.updateRadius) { $$.updateRadius(); }
  
          if ($$.isLegendRight && hasArc) {
              $$.margin3.left = $$.arcWidth / 2 + $$.radiusExpanded * 1.1;
          }
      };
  
      c3_chart_internal_fn.updateTargets = function (targets) {
          var $$ = this;
  
          /*-- Main --*/
  
          //-- Text --//
          $$.updateTargetsForText(targets);
  
          //-- Bar --//
          $$.updateTargetsForBar(targets);
  
          //-- Line --//
          $$.updateTargetsForLine(targets);
  
          //-- Arc --//
          if ($$.hasArcType() && $$.updateTargetsForArc) { $$.updateTargetsForArc(targets); }
  
          /*-- Sub --*/
  
          if ($$.updateTargetsForSubchart) { $$.updateTargetsForSubchart(targets); }
  
          // Fade-in each chart
          $$.showTargets();
      };
      c3_chart_internal_fn.showTargets = function () {
          var $$ = this;
          $$.svg.selectAll('.' + CLASS.target).filter(function (d) { return $$.isTargetToShow(d.id); })
            .transition().duration($$.config.transition_duration)
              .style("opacity", 1);
      };
  
      c3_chart_internal_fn.redraw = function (options, transitions) {
          var $$ = this, main = $$.main, d3 = $$.d3, config = $$.config;
          var areaIndices = $$.getShapeIndices($$.isAreaType), barIndices = $$.getShapeIndices($$.isBarType), lineIndices = $$.getShapeIndices($$.isLineType);
          var withY, withSubchart, withTransition, withTransitionForExit, withTransitionForAxis,
              withTransform, withUpdateXDomain, withUpdateOrgXDomain, withTrimXDomain, withLegend,
              withEventRect, withDimension, withUpdateXAxis;
          var hideAxis = $$.hasArcType();
          var drawArea, drawBar, drawLine, xForText, yForText;
          var duration, durationForExit, durationForAxis;
          var waitForDraw, flow;
          var targetsToShow = $$.filterTargetsToShow($$.data.targets), tickValues, i, intervalForCulling, xDomainForZoom;
          var xv = $$.xv.bind($$), cx, cy;
  
          options = options || {};
          withY = getOption(options, "withY", true);
          withSubchart = getOption(options, "withSubchart", true);
          withTransition = getOption(options, "withTransition", true);
          withTransform = getOption(options, "withTransform", false);
          withUpdateXDomain = getOption(options, "withUpdateXDomain", false);
          withUpdateOrgXDomain = getOption(options, "withUpdateOrgXDomain", false);
          withTrimXDomain = getOption(options, "withTrimXDomain", true);
          withUpdateXAxis = getOption(options, "withUpdateXAxis", withUpdateXDomain);
          withLegend = getOption(options, "withLegend", false);
          withEventRect = getOption(options, "withEventRect", true);
          withDimension = getOption(options, "withDimension", true);
          withTransitionForExit = getOption(options, "withTransitionForExit", withTransition);
          withTransitionForAxis = getOption(options, "withTransitionForAxis", withTransition);
  
          duration = withTransition ? config.transition_duration : 0;
          durationForExit = withTransitionForExit ? duration : 0;
          durationForAxis = withTransitionForAxis ? duration : 0;
  
          transitions = transitions || $$.axis.generateTransitions(durationForAxis);
  
          // update legend and transform each g
          if (withLegend && config.legend_show) {
              $$.updateLegend($$.mapToIds($$.data.targets), options, transitions);
          } else if (withDimension) {
              // need to update dimension (e.g. axis.y.tick.values) because y tick values should change
              // no need to update axis in it because they will be updated in redraw()
              $$.updateDimension(true);
          }
  
          // MEMO: needed for grids calculation
          if ($$.isCategorized() && targetsToShow.length === 0) {
              $$.x.domain([0, $$.axes.x.selectAll('.tick').size()]);
          }
  
          if (targetsToShow.length) {
              $$.updateXDomain(targetsToShow, withUpdateXDomain, withUpdateOrgXDomain, withTrimXDomain);
              if (!config.axis_x_tick_values) {
                  tickValues = $$.axis.updateXAxisTickValues(targetsToShow);
              }
          } else {
              $$.xAxis.tickValues([]);
              $$.subXAxis.tickValues([]);
          }
  
          if (config.zoom_rescale && !options.flow) {
              xDomainForZoom = $$.x.orgDomain();
          }
  
          $$.y.domain($$.getYDomain(targetsToShow, 'y', xDomainForZoom));
          $$.y2.domain($$.getYDomain(targetsToShow, 'y2', xDomainForZoom));
  
          if (!config.axis_y_tick_values && config.axis_y_tick_count) {
              $$.yAxis.tickValues($$.axis.generateTickValues($$.y.domain(), config.axis_y_tick_count));
          }
          if (!config.axis_y2_tick_values && config.axis_y2_tick_count) {
              $$.y2Axis.tickValues($$.axis.generateTickValues($$.y2.domain(), config.axis_y2_tick_count));
          }
  
          // axes
          $$.axis.redraw(transitions, hideAxis);
  
          // Update axis label
          $$.axis.updateLabels(withTransition);
  
          // show/hide if manual culling needed
          if ((withUpdateXDomain || withUpdateXAxis) && targetsToShow.length) {
              if (config.axis_x_tick_culling && tickValues) {
                  for (i = 1; i < tickValues.length; i++) {
                      if (tickValues.length / i < config.axis_x_tick_culling_max) {
                          intervalForCulling = i;
                          break;
                      }
                  }
                  $$.svg.selectAll('.' + CLASS.axisX + ' .tick text').each(function (e) {
                      var index = tickValues.indexOf(e);
                      if (index >= 0) {
                          d3.select(this).style('display', index % intervalForCulling ? 'none' : 'block');
                      }
                  });
              } else {
                  $$.svg.selectAll('.' + CLASS.axisX + ' .tick text').style('display', 'block');
              }
          }
  
          // setup drawer - MEMO: these must be called after axis updated
          drawArea = $$.generateDrawArea ? $$.generateDrawArea(areaIndices, false) : undefined;
          drawBar = $$.generateDrawBar ? $$.generateDrawBar(barIndices) : undefined;
          drawLine = $$.generateDrawLine ? $$.generateDrawLine(lineIndices, false) : undefined;
          xForText = $$.generateXYForText(areaIndices, barIndices, lineIndices, true);
          yForText = $$.generateXYForText(areaIndices, barIndices, lineIndices, false);
  
          // Update sub domain
          if (withY) {
              $$.subY.domain($$.getYDomain(targetsToShow, 'y'));
              $$.subY2.domain($$.getYDomain(targetsToShow, 'y2'));
          }
  
          // tooltip
          $$.tooltip.style("display", "none");
  
          // xgrid focus
          $$.updateXgridFocus();
  
          // Data empty label positioning and text.
          main.select("text." + CLASS.text + '.' + CLASS.empty)
              .attr("x", $$.width / 2)
              .attr("y", $$.height / 2)
              .text(config.data_empty_label_text)
            .transition()
              .style('opacity', targetsToShow.length ? 0 : 1);
  
          // grid
          $$.updateGrid(duration);
  
          // rect for regions
          $$.updateRegion(duration);
  
          // bars
          $$.updateBar(durationForExit);
  
          // lines, areas and cricles
          $$.updateLine(durationForExit);
          $$.updateArea(durationForExit);
          $$.updateCircle();
  
          // text
          if ($$.hasDataLabel()) {
              $$.updateText(durationForExit);
          }
  
          // arc
          if ($$.redrawArc) { $$.redrawArc(duration, durationForExit, withTransform); }
  
          // subchart
          if ($$.redrawSubchart) {
              $$.redrawSubchart(withSubchart, transitions, duration, durationForExit, areaIndices, barIndices, lineIndices);
          }
  
          // circles for select
          main.selectAll('.' + CLASS.selectedCircles)
              .filter($$.isBarType.bind($$))
              .selectAll('circle')
              .remove();
  
          // event rects will redrawn when flow called
          if (config.interaction_enabled && !options.flow && withEventRect) {
              $$.redrawEventRect();
              if ($$.updateZoom) { $$.updateZoom(); }
          }
  
          // update circleY based on updated parameters
          $$.updateCircleY();
  
          // generate circle x/y functions depending on updated params
          cx = ($$.config.axis_rotated ? $$.circleY : $$.circleX).bind($$);
          cy = ($$.config.axis_rotated ? $$.circleX : $$.circleY).bind($$);
  
          if (options.flow) {
              flow = $$.generateFlow({
                  targets: targetsToShow,
                  flow: options.flow,
                  duration: options.flow.duration,
                  drawBar: drawBar,
                  drawLine: drawLine,
                  drawArea: drawArea,
                  cx: cx,
                  cy: cy,
                  xv: xv,
                  xForText: xForText,
                  yForText: yForText
              });
          }
  
          if ((duration || flow) && $$.isTabVisible()) { // Only use transition if tab visible. See #938.
              // transition should be derived from one transition
              d3.transition().duration(duration).each(function () {
                  var transitionsToWait = [];
  
                  // redraw and gather transitions
                  [
                      $$.redrawBar(drawBar, true),
                      $$.redrawLine(drawLine, true),
                      $$.redrawArea(drawArea, true),
                      $$.redrawCircle(cx, cy, true),
                      $$.redrawText(xForText, yForText, options.flow, true),
                      $$.redrawRegion(true),
                      $$.redrawGrid(true),
                  ].forEach(function (transitions) {
                      transitions.forEach(function (transition) {
                          transitionsToWait.push(transition);
                      });
                  });
  
                  // Wait for end of transitions to call flow and onrendered callback
                  waitForDraw = $$.generateWait();
                  transitionsToWait.forEach(function (t) {
                      waitForDraw.add(t);
                  });
              })
              .call(waitForDraw, function () {
                  if (flow) {
                      flow();
                  }
                  if (config.onrendered) {
                      config.onrendered.call($$);
                  }
              });
          }
          else {
              $$.redrawBar(drawBar);
              $$.redrawLine(drawLine);
              $$.redrawArea(drawArea);
              $$.redrawCircle(cx, cy);
              $$.redrawText(xForText, yForText, options.flow);
              $$.redrawRegion();
              $$.redrawGrid();
              if (config.onrendered) {
                  config.onrendered.call($$);
              }
          }
  
          // update fadein condition
          $$.mapToIds($$.data.targets).forEach(function (id) {
              $$.withoutFadeIn[id] = true;
          });
      };
  
      c3_chart_internal_fn.updateAndRedraw = function (options) {
          var $$ = this, config = $$.config, transitions;
          options = options || {};
          // same with redraw
          options.withTransition = getOption(options, "withTransition", true);
          options.withTransform = getOption(options, "withTransform", false);
          options.withLegend = getOption(options, "withLegend", false);
          // NOT same with redraw
          options.withUpdateXDomain = true;
          options.withUpdateOrgXDomain = true;
          options.withTransitionForExit = false;
          options.withTransitionForTransform = getOption(options, "withTransitionForTransform", options.withTransition);
          // MEMO: this needs to be called before updateLegend and it means this ALWAYS needs to be called)
          $$.updateSizes();
          // MEMO: called in updateLegend in redraw if withLegend
          if (!(options.withLegend && config.legend_show)) {
              transitions = $$.axis.generateTransitions(options.withTransitionForAxis ? config.transition_duration : 0);
              // Update scales
              $$.updateScales();
              $$.updateSvgSize();
              // Update g positions
              $$.transformAll(options.withTransitionForTransform, transitions);
          }
          // Draw with new sizes & scales
          $$.redraw(options, transitions);
      };
      c3_chart_internal_fn.redrawWithoutRescale = function () {
          this.redraw({
              withY: false,
              withSubchart: false,
              withEventRect: false,
              withTransitionForAxis: false
          });
      };
  
      c3_chart_internal_fn.isTimeSeries = function () {
          return this.config.axis_x_type === 'timeseries';
      };
      c3_chart_internal_fn.isCategorized = function () {
          return this.config.axis_x_type.indexOf('categor') >= 0;
      };
      c3_chart_internal_fn.isCustomX = function () {
          var $$ = this, config = $$.config;
          return !$$.isTimeSeries() && (config.data_x || notEmpty(config.data_xs));
      };
  
      c3_chart_internal_fn.isTimeSeriesY = function () {
          return this.config.axis_y_type === 'timeseries';
      };
  
      c3_chart_internal_fn.getTranslate = function (target) {
          var $$ = this, config = $$.config, x, y;
          if (target === 'main') {
              x = asHalfPixel($$.margin.left);
              y = asHalfPixel($$.margin.top);
          } else if (target === 'context') {
              x = asHalfPixel($$.margin2.left);
              y = asHalfPixel($$.margin2.top);
          } else if (target === 'legend') {
              x = $$.margin3.left;
              y = $$.margin3.top;
          } else if (target === 'x') {
              x = 0;
              y = config.axis_rotated ? 0 : $$.height;
          } else if (target === 'y') {
              x = 0;
              y = config.axis_rotated ? $$.height : 0;
          } else if (target === 'y2') {
              x = config.axis_rotated ? 0 : $$.width;
              y = config.axis_rotated ? 1 : 0;
          } else if (target === 'subx') {
              x = 0;
              y = config.axis_rotated ? 0 : $$.height2;
          } else if (target === 'arc') {
              x = $$.arcWidth / 2;
              y = $$.arcHeight / 2;
          }
          return "translate(" + x + "," + y + ")";
      };
      c3_chart_internal_fn.initialOpacity = function (d) {
          return d.value !== null && this.withoutFadeIn[d.id] ? 1 : 0;
      };
      c3_chart_internal_fn.initialOpacityForCircle = function (d) {
          return d.value !== null && this.withoutFadeIn[d.id] ? this.opacityForCircle(d) : 0;
      };
      c3_chart_internal_fn.opacityForCircle = function (d) {
          var opacity = this.config.point_show ? 1 : 0;
          return isValue(d.value) ? (this.isScatterType(d) ? 0.5 : opacity) : 0;
      };
      c3_chart_internal_fn.opacityForText = function () {
          return this.hasDataLabel() ? 1 : 0;
      };
      c3_chart_internal_fn.xx = function (d) {
          return d ? this.x(d.x) : null;
      };
      c3_chart_internal_fn.xv = function (d) {
          var $$ = this, value = d.value;
          if ($$.isTimeSeries()) {
              value = $$.parseDate(d.value);
          }
          else if ($$.isCategorized() && typeof d.value === 'string') {
              value = $$.config.axis_x_categories.indexOf(d.value);
          }
          return Math.ceil($$.x(value));
      };
      c3_chart_internal_fn.yv = function (d) {
          var $$ = this,
              yScale = d.axis && d.axis === 'y2' ? $$.y2 : $$.y;
          return Math.ceil(yScale(d.value));
      };
      c3_chart_internal_fn.subxx = function (d) {
          return d ? this.subX(d.x) : null;
      };
  
      c3_chart_internal_fn.transformMain = function (withTransition, transitions) {
          var $$ = this,
              xAxis, yAxis, y2Axis;
          if (transitions && transitions.axisX) {
              xAxis = transitions.axisX;
          } else {
              xAxis  = $$.main.select('.' + CLASS.axisX);
              if (withTransition) { xAxis = xAxis.transition(); }
          }
          if (transitions && transitions.axisY) {
              yAxis = transitions.axisY;
          } else {
              yAxis = $$.main.select('.' + CLASS.axisY);
              if (withTransition) { yAxis = yAxis.transition(); }
          }
          if (transitions && transitions.axisY2) {
              y2Axis = transitions.axisY2;
          } else {
              y2Axis = $$.main.select('.' + CLASS.axisY2);
              if (withTransition) { y2Axis = y2Axis.transition(); }
          }
          (withTransition ? $$.main.transition() : $$.main).attr("transform", $$.getTranslate('main'));
          xAxis.attr("transform", $$.getTranslate('x'));
          yAxis.attr("transform", $$.getTranslate('y'));
          y2Axis.attr("transform", $$.getTranslate('y2'));
          $$.main.select('.' + CLASS.chartArcs).attr("transform", $$.getTranslate('arc'));
      };
      c3_chart_internal_fn.transformAll = function (withTransition, transitions) {
          var $$ = this;
          $$.transformMain(withTransition, transitions);
          if ($$.config.subchart_show) { $$.transformContext(withTransition, transitions); }
          if ($$.legend) { $$.transformLegend(withTransition); }
      };
  
      c3_chart_internal_fn.updateSvgSize = function () {
          var $$ = this,
              brush = $$.svg.select(".c3-brush .background");
          $$.svg.attr('width', $$.currentWidth).attr('height', $$.currentHeight);
          $$.svg.selectAll(['#' + $$.clipId, '#' + $$.clipIdForGrid]).select('rect')
              .attr('width', $$.width)
              .attr('height', $$.height);
          $$.svg.select('#' + $$.clipIdForXAxis).select('rect')
              .attr('x', $$.getXAxisClipX.bind($$))
              .attr('y', $$.getXAxisClipY.bind($$))
              .attr('width', $$.getXAxisClipWidth.bind($$))
              .attr('height', $$.getXAxisClipHeight.bind($$));
          $$.svg.select('#' + $$.clipIdForYAxis).select('rect')
              .attr('x', $$.getYAxisClipX.bind($$))
              .attr('y', $$.getYAxisClipY.bind($$))
              .attr('width', $$.getYAxisClipWidth.bind($$))
              .attr('height', $$.getYAxisClipHeight.bind($$));
          $$.svg.select('#' + $$.clipIdForSubchart).select('rect')
              .attr('width', $$.width)
              .attr('height', brush.size() ? brush.attr('height') : 0);
          $$.svg.select('.' + CLASS.zoomRect)
              .attr('width', $$.width)
              .attr('height', $$.height);
          // MEMO: parent div's height will be bigger than svg when <!DOCTYPE html>
          $$.selectChart.style('max-height', $$.currentHeight + "px");
      };
  
  
      c3_chart_internal_fn.updateDimension = function (withoutAxis) {
          var $$ = this;
          if (!withoutAxis) {
              if ($$.config.axis_rotated) {
                  $$.axes.x.call($$.xAxis);
                  $$.axes.subx.call($$.subXAxis);
              } else {
                  $$.axes.y.call($$.yAxis);
                  $$.axes.y2.call($$.y2Axis);
              }
          }
          $$.updateSizes();
          $$.updateScales();
          $$.updateSvgSize();
          $$.transformAll(false);
      };
  
      c3_chart_internal_fn.observeInserted = function (selection) {
          var $$ = this, observer;
          if (typeof MutationObserver === 'undefined') {
              window.console.error("MutationObserver not defined.");
              return;
          }
          observer= new MutationObserver(function (mutations) {
              mutations.forEach(function (mutation) {
                  if (mutation.type === 'childList' && mutation.previousSibling) {
                      observer.disconnect();
                      // need to wait for completion of load because size calculation requires the actual sizes determined after that completion
                      $$.intervalForObserveInserted = window.setInterval(function () {
                          // parentNode will NOT be null when completed
                          if (selection.node().parentNode) {
                              window.clearInterval($$.intervalForObserveInserted);
                              $$.updateDimension();
                              $$.config.oninit.call($$);
                              $$.redraw({
                                  withTransform: true,
                                  withUpdateXDomain: true,
                                  withUpdateOrgXDomain: true,
                                  withTransition: false,
                                  withTransitionForTransform: false,
                                  withLegend: true
                              });
                              selection.transition().style('opacity', 1);
                          }
                      }, 10);
                  }
              });
          });
          observer.observe(selection.node(), {attributes: true, childList: true, characterData: true});
      };
  
  
      c3_chart_internal_fn.generateResize = function () {
          var resizeFunctions = [];
          function callResizeFunctions() {
              resizeFunctions.forEach(function (f) {
                  f();
              });
          }
          callResizeFunctions.add = function (f) {
              resizeFunctions.push(f);
          };
          return callResizeFunctions;
      };
  
      c3_chart_internal_fn.endall = function (transition, callback) {
          var n = 0;
          transition
              .each(function () { ++n; })
              .each("end", function () {
                  if (!--n) { callback.apply(this, arguments); }
              });
      };
      c3_chart_internal_fn.generateWait = function () {
          var transitionsToWait = [],
              f = function (transition, callback) {
                  var timer = setInterval(function () {
                      var done = 0;
                      transitionsToWait.forEach(function (t) {
                          if (t.empty()) {
                              done += 1;
                              return;
                          }
                          try {
                              t.transition();
                          } catch (e) {
                              done += 1;
                          }
                      });
                      if (done === transitionsToWait.length) {
                          clearInterval(timer);
                          if (callback) { callback(); }
                      }
                  }, 10);
              };
          f.add = function (transition) {
              transitionsToWait.push(transition);
          };
          return f;
      };
  
      c3_chart_internal_fn.parseDate = function (date) {
          var $$ = this, parsedDate;
          if (date instanceof Date) {
              parsedDate = date;
          } else if (typeof date === 'string') {
              parsedDate = $$.dataTimeFormat($$.config.data_xFormat).parse(date);
          } else if (typeof date === 'number' || !isNaN(date)) {
              parsedDate = new Date(+date);
          }
          if (!parsedDate || isNaN(+parsedDate)) {
              window.console.error("Failed to parse x '" + date + "' to Date object");
          }
          return parsedDate;
      };
  
      c3_chart_internal_fn.isTabVisible = function () {
          var hidden;
          if (typeof document.hidden !== "undefined") { // Opera 12.10 and Firefox 18 and later support
              hidden = "hidden";
          } else if (typeof document.mozHidden !== "undefined") {
              hidden = "mozHidden";
          } else if (typeof document.msHidden !== "undefined") {
              hidden = "msHidden";
          } else if (typeof document.webkitHidden !== "undefined") {
              hidden = "webkitHidden";
          }
  
          return document[hidden] ? false : true;
      };
  
      c3_chart_internal_fn.getDefaultConfig = function () {
          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_rescale: false,
              zoom_onzoom: function () {},
              zoom_onzoomstart: function () {},
              zoom_onzoomend: function () {},
              interaction_enabled: true,
              onmouseover: function () {},
              onmouseout: function () {},
              onresize: function () {},
              onresized: function () {},
              oninit: function () {},
              onrendered: function () {},
              transition_duration: 350,
              data_x: undefined,
              data_xs: {},
              data_xFormat: '%Y-%m-%d',
              data_xLocaltime: true,
              data_xSort: 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_selection_draggable: false,
              data_onclick: function () {},
              data_onmouseover: function () {},
              data_onmouseout: function () {},
              data_onselected: function () {},
              data_onunselected: 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_hide: false,
              legend_position: 'bottom',
              legend_inset_anchor: 'top-left',
              legend_inset_x: 10,
              legend_inset_y: 0,
              legend_inset_step: undefined,
              legend_item_onclick: undefined,
              legend_item_onmouseover: undefined,
              legend_item_onmouseout: undefined,
              legend_equally: false,
              // axis
              axis_rotated: false,
              axis_x_show: true,
              axis_x_type: 'indexed',
              axis_x_localtime: true,
              axis_x_categories: [],
              axis_x_tick_centered: false,
              axis_x_tick_format: undefined,
              axis_x_tick_culling: {},
              axis_x_tick_culling_max: 10,
              axis_x_tick_count: undefined,
              axis_x_tick_fit: true,
              axis_x_tick_values: null,
              axis_x_tick_rotate: 0,
              axis_x_tick_outer: true,
              axis_x_tick_multiline: true,
              axis_x_tick_width: null,
              axis_x_max: undefined,
              axis_x_min: undefined,
              axis_x_padding: {},
              axis_x_height: undefined,
              axis_x_extent: undefined,
              axis_x_label: {},
              axis_y_show: true,
              axis_y_type: undefined,
              axis_y_max: undefined,
              axis_y_min: undefined,
              axis_y_inverted: false,
              axis_y_center: undefined,
              axis_y_inner: undefined,
              axis_y_label: {},
              axis_y_tick_format: undefined,
              axis_y_tick_outer: true,
              axis_y_tick_values: null,
              axis_y_tick_count: undefined,
              axis_y_tick_time_value: undefined,
              axis_y_tick_time_interval: undefined,
              axis_y_padding: {},
              axis_y_default: undefined,
              axis_y2_show: false,
              axis_y2_max: undefined,
              axis_y2_min: undefined,
              axis_y2_inverted: false,
              axis_y2_center: undefined,
              axis_y2_inner: undefined,
              axis_y2_label: {},
              axis_y2_tick_format: undefined,
              axis_y2_tick_outer: true,
              axis_y2_tick_values: null,
              axis_y2_tick_count: undefined,
              axis_y2_padding: {},
              axis_y2_default: undefined,
              // grid
              grid_x_show: false,
              grid_x_type: 'tick',
              grid_x_lines: [],
              grid_y_show: false,
              // not used
              // grid_y_type: 'tick',
              grid_y_lines: [],
              grid_y_ticks: 10,
              grid_focus_show: true,
              grid_lines_front: true,
              // point - point of each data
              point_show: true,
              point_r: 2.5,
              point_focus_expand_enabled: true,
              point_focus_expand_r: undefined,
              point_select_r: undefined,
              // line
              line_connectNull: false,
              line_step_type: 'step',
              // bar
              bar_width: undefined,
              bar_width_ratio: 0.6,
              bar_width_max: undefined,
              bar_zerobased: true,
              // area
              area_zerobased: true,
              // pie
              pie_label_show: true,
              pie_label_format: undefined,
              pie_label_threshold: 0.05,
              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_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_position: 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];
          }, this);
  
          return config;
      };
      c3_chart_internal_fn.additionalConfig = {};
  
      c3_chart_internal_fn.loadConfig = function (config) {
          var this_config = this.config, target, keys, read;
          function find() {
              var key = keys.shift();
      //        console.log("key =>", key, ", target =>", target);
              if (key && target && typeof target === 'object' && key in target) {
                  target = target[key];
                  return find();
              }
              else if (!key) {
                  return target;
              }
              else {
                  return undefined;
              }
          }
          Object.keys(this_config).forEach(function (key) {
              target = config;
              keys = key.split('_');
              read = find();
      //        console.log("CONFIG : ", key, read);
              if (isDefined(read)) {
                  this_config[key] = read;
              }
          });
      };
  
      c3_chart_internal_fn.getScale = function (min, max, forTimeseries) {
          return (forTimeseries ? this.d3.time.scale() : this.d3.scale.linear()).range([min, max]);
      };
      c3_chart_internal_fn.getX = function (min, max, domain, offset) {
          var $$ = this,
              scale = $$.getScale(min, max, $$.isTimeSeries()),
              _scale = domain ? scale.domain(domain) : scale, key;
          // Define customized scale if categorized axis
          if ($$.isCategorized()) {
              offset = offset || function () { return 0; };
              scale = function (d, raw) {
                  var v = _scale(d) + offset(d);
                  return raw ? v : Math.ceil(v);
              };
          } else {
              scale = function (d, raw) {
                  var v = _scale(d);
                  return raw ? v : Math.ceil(v);
              };
          }
          // define functions
          for (key in _scale) {
              scale[key] = _scale[key];
          }
          scale.orgDomain = function () {
              return _scale.domain();
          };
          // define custom domain() for categorized axis
          if ($$.isCategorized()) {
              scale.domain = function (domain) {
                  if (!arguments.length) {
                      domain = this.orgDomain();
                      return [domain[0], domain[1] + 1];
                  }
                  _scale.domain(domain);
                  return scale;
              };
          }
          return scale;
      };
      c3_chart_internal_fn.getY = function (min, max, domain) {
          var scale = this.getScale(min, max, this.isTimeSeriesY());
          if (domain) { scale.domain(domain); }
          return scale;
      };
      c3_chart_internal_fn.getYScale = function (id) {
          return this.axis.getId(id) === 'y2' ? this.y2 : this.y;
      };
      c3_chart_internal_fn.getSubYScale = function (id) {
          return this.axis.getId(id) === 'y2' ? this.subY2 : this.subY;
      };
      c3_chart_internal_fn.updateScales = function () {
          var $$ = this, config = $$.config,
              forInit = !$$.x;
          // update edges
          $$.xMin = config.axis_rotated ? 1 : 0;
          $$.xMax = config.axis_rotated ? $$.height : $$.width;
          $$.yMin = config.axis_rotated ? 0 : $$.height;
          $$.yMax = config.axis_rotated ? $$.width : 1;
          $$.subXMin = $$.xMin;
          $$.subXMax = $$.xMax;
          $$.subYMin = config.axis_rotated ? 0 : $$.height2;
          $$.subYMax = config.axis_rotated ? $$.width2 : 1;
          // update scales
          $$.x = $$.getX($$.xMin, $$.xMax, forInit ? undefined : $$.x.orgDomain(), function () { return $$.xAxis.tickOffset(); });
          $$.y = $$.getY($$.yMin, $$.yMax, forInit ? config.axis_y_default : $$.y.domain());
          $$.y2 = $$.getY($$.yMin, $$.yMax, forInit ? config.axis_y2_default : $$.y2.domain());
          $$.subX = $$.getX($$.xMin, $$.xMax, $$.orgXDomain, function (d) { return d % 1 ? 0 : $$.subXAxis.tickOffset(); });
          $$.subY = $$.getY($$.subYMin, $$.subYMax, forInit ? config.axis_y_default : $$.subY.domain());
          $$.subY2 = $$.getY($$.subYMin, $$.subYMax, forInit ? config.axis_y2_default : $$.subY2.domain());
          // update axes
          $$.xAxisTickFormat = $$.axis.getXAxisTickFormat();
          $$.xAxisTickValues = $$.axis.getXAxisTickValues();
          $$.yAxisTickValues = $$.axis.getYAxisTickValues();
          $$.y2AxisTickValues = $$.axis.getY2AxisTickValues();
  
          $$.xAxis = $$.axis.getXAxis($$.x, $$.xOrient, $$.xAxisTickFormat, $$.xAxisTickValues, config.axis_x_tick_outer);
          $$.subXAxis = $$.axis.getXAxis($$.subX, $$.subXOrient, $$.xAxisTickFormat, $$.xAxisTickValues, config.axis_x_tick_outer);
          $$.yAxis = $$.axis.getYAxis($$.y, $$.yOrient, config.axis_y_tick_format, $$.yAxisTickValues, config.axis_y_tick_outer);
          $$.y2Axis = $$.axis.getYAxis($$.y2, $$.y2Orient, config.axis_y2_tick_format, $$.y2AxisTickValues, config.axis_y2_tick_outer);
  
          // Set initialized scales to brush and zoom
          if (!forInit) {
              if ($$.brush) { $$.brush.scale($$.subX); }
              if (config.zoom_enabled) { $$.zoom.scale($$.x); }
          }
          // update for arc
          if ($$.updateArc) { $$.updateArc(); }
      };
  
      c3_chart_internal_fn.getYDomainMin = function (targets) {
          var $$ = this, config = $$.config,
              ids = $$.mapToIds(targets), ys = $$.getValuesAsIdKeyed(targets),
              j, k, baseId, idsInGroup, id, hasNegativeValue;
          if (config.data_groups.length > 0) {
              hasNegativeValue = $$.hasNegativeValueInTargets(targets);
              for (j = 0; j < config.data_groups.length; j++) {
                  // Determine baseId
                  idsInGroup = config.data_groups[j].filter(function (id) { return ids.indexOf(id) >= 0; });
                  if (idsInGroup.length === 0) { continue; }
                  baseId = idsInGroup[0];
                  // Consider negative values
                  if (hasNegativeValue && ys[baseId]) {
                      ys[baseId].forEach(function (v, i) {
                          ys[baseId][i] = v < 0 ? v : 0;
                      });
                  }
                  // Compute min
                  for (k = 1; k < idsInGroup.length; k++) {
                      id = idsInGroup[k];
                      if (! ys[id]) { continue; }
                      ys[id].forEach(function (v, i) {
                          if ($$.axis.getId(id) === $$.axis.getId(baseId) && ys[baseId] && !(hasNegativeValue && +v > 0)) {
                              ys[baseId][i] += +v;
                          }
                      });
                  }
              }
          }
          return $$.d3.min(Object.keys(ys).map(function (key) { return $$.d3.min(ys[key]); }));
      };
      c3_chart_internal_fn.getYDomainMax = function (targets) {
          var $$ = this, config = $$.config,
              ids = $$.mapToIds(targets), ys = $$.getValuesAsIdKeyed(targets),
              j, k, baseId, idsInGroup, id, hasPositiveValue;
          if (config.data_groups.length > 0) {
              hasPositiveValue = $$.hasPositiveValueInTargets(targets);
              for (j = 0; j < config.data_groups.length; j++) {
                  // Determine baseId
                  idsInGroup = config.data_groups[j].filter(function (id) { return ids.indexOf(id) >= 0; });
                  if (idsInGroup.length === 0) { continue; }
                  baseId = idsInGroup[0];
                  // Consider positive values
                  if (hasPositiveValue && ys[baseId]) {
                      ys[baseId].forEach(function (v, i) {
                          ys[baseId][i] = v > 0 ? v : 0;
                      });
                  }
                  // Compute max
                  for (k = 1; k < idsInGroup.length; k++) {
                      id = idsInGroup[k];
                      if (! ys[id]) { continue; }
                      ys[id].forEach(function (v, i) {
                          if ($$.axis.getId(id) === $$.axis.getId(baseId) && ys[baseId] && !(hasPositiveValue && +v < 0)) {
                              ys[baseId][i] += +v;
                          }
                      });
                  }
              }
          }
          return $$.d3.max(Object.keys(ys).map(function (key) { return $$.d3.max(ys[key]); }));
      };
      c3_chart_internal_fn.getYDomain = function (targets, axisId, xDomain) {
          var $$ = this, config = $$.config,
              targetsByAxisId = targets.filter(function (t) { return $$.axis.getId(t.id) === axisId; }),
              yTargets = xDomain ? $$.filterByXDomain(targetsByAxisId, xDomain) : targetsByAxisId,
              yMin = axisId === 'y2' ? config.axis_y2_min : config.axis_y_min,
              yMax = axisId === 'y2' ? config.axis_y2_max : config.axis_y_max,
              yDomainMin = $$.getYDomainMin(yTargets),
              yDomainMax = $$.getYDomainMax(yTargets),
              domain, domainLength, padding, padding_top, padding_bottom,
              center = axisId === 'y2' ? config.axis_y2_center : config.axis_y_center,
              yDomainAbs, lengths, diff, ratio, isAllPositive, isAllNegative,
              isZeroBased = ($$.hasType('bar', yTargets) && config.bar_zerobased) || ($$.hasType('area', yTargets) && config.area_zerobased),
              isInverted = axisId === 'y2' ? config.axis_y2_inverted : config.axis_y_inverted,
              showHorizontalDataLabel = $$.hasDataLabel() && config.axis_rotated,
              showVerticalDataLabel = $$.hasDataLabel() && !config.axis_rotated;
  
          // MEMO: avoid inverting domain unexpectedly
          yDomainMin = isValue(yMin) ? yMin : isValue(yMax) ? (yDomainMin < yMax ? yDomainMin : yMax - 10) : yDomainMin;
          yDomainMax = isValue(yMax) ? yMax : isValue(yMin) ? (yMin < yDomainMax ? yDomainMax : yMin + 10) : yDomainMax;
  
          if (yTargets.length === 0) { // use current domain if target of axisId is none
              return axisId === 'y2' ? $$.y2.domain() : $$.y.domain();
          }
          if (isNaN(yDomainMin)) { // set minimum to zero when not number
              yDomainMin = 0;
          }
          if (isNaN(yDomainMax)) { // set maximum to have same value as yDomainMin
              yDomainMax = yDomainMin;
          }
          if (yDomainMin === yDomainMax) {
              yDomainMin < 0 ? yDomainMax = 0 : yDomainMin = 0;
          }
          isAllPositive = yDomainMin >= 0 && yDomainMax >= 0;
          isAllNegative = yDomainMin <= 0 && yDomainMax <= 0;
  
          // Cancel zerobased if axis_*_min / axis_*_max specified
          if ((isValue(yMin) && isAllPositive) || (isValue(yMax) && isAllNegative)) {
              isZeroBased = false;
          }
  
          // Bar/Area chart should be 0-based if all positive|negative
          if (isZeroBased) {
              if (isAllPositive) { yDomainMin = 0; }
              if (isAllNegative) { yDomainMax = 0; }
          }
  
          domainLength = Math.abs(yDomainMax - yDomainMin);
          padding = padding_top = padding_bottom = domainLength * 0.1;
  
          if (typeof center !== 'undefined') {
              yDomainAbs = Math.max(Math.abs(yDomainMin), Math.abs(yDomainMax));
              yDomainMax = center + yDomainAbs;
              yDomainMin = center - yDomainAbs;
          }
          // add padding for data label
          if (showHorizontalDataLabel) {
              lengths = $$.getDataLabelLength(yDomainMin, yDomainMax, 'width');
              diff = diffDomain($$.y.range());
              ratio = [lengths[0] / diff, lengths[1] / diff];
              padding_top += domainLength * (ratio[1] / (1 - ratio[0] - ratio[1]));
              padding_bottom += domainLength * (ratio[0] / (1 - ratio[0] - ratio[1]));
          } else if (showVerticalDataLabel) {
              lengths = $$.getDataLabelLength(yDomainMin, yDomainMax, 'height');
              padding_top += $$.axis.convertPixelsToAxisPadding(lengths[1], domainLength);
              padding_bottom += $$.axis.convertPixelsToAxisPadding(lengths[0], domainLength);
          }
          if (axisId === 'y' && notEmpty(config.axis_y_padding)) {
              padding_top = $$.axis.getPadding(config.axis_y_padding, 'top', padding_top, domainLength);
              padding_bottom = $$.axis.getPadding(config.axis_y_padding, 'bottom', padding_bottom, domainLength);
          }
          if (axisId === 'y2' && notEmpty(config.axis_y2_padding)) {
              padding_top = $$.axis.getPadding(config.axis_y2_padding, 'top', padding_top, domainLength);
              padding_bottom = $$.axis.getPadding(config.axis_y2_padding, 'bottom', padding_bottom, domainLength);
          }
          // Bar/Area chart should be 0-based if all positive|negative
          if (isZeroBased) {
              if (isAllPositive) { padding_bottom = yDomainMin; }
              if (isAllNegative) { padding_top = -yDomainMax; }
          }
          domain = [yDomainMin - padding_bottom, yDomainMax + padding_top];
          return isInverted ? domain.reverse() : domain;
      };
      c3_chart_internal_fn.getXDomainMin = function (targets) {
          var $$ = this, config = $$.config;
          return isDefined(config.axis_x_min) ?
              ($$.isTimeSeries() ? this.parseDate(config.axis_x_min) : config.axis_x_min) :
          $$.d3.min(targets, function (t) { return $$.d3.min(t.values, function (v) { return v.x; }); });
      };
      c3_chart_internal_fn.getXDomainMax = function (targets) {
          var $$ = this, config = $$.config;
          return isDefined(config.axis_x_max) ?
              ($$.isTimeSeries() ? this.parseDate(config.axis_x_max) : config.axis_x_max) :
          $$.d3.max(targets, function (t) { return $$.d3.max(t.values, function (v) { return v.x; }); });
      };
      c3_chart_internal_fn.getXDomainPadding = function (domain) {
          var $$ = this, config = $$.config,
              diff = domain[1] - domain[0],
              maxDataCount, padding, paddingLeft, paddingRight;
          if ($$.isCategorized()) {
              padding = 0;
          } else if ($$.hasType('bar')) {
              maxDataCount = $$.getMaxDataCount();
              padding = maxDataCount > 1 ? (diff / (maxDataCount - 1)) / 2 : 0.5;
          } else {
              padding = diff * 0.01;
          }
          if (typeof config.axis_x_padding === 'object' && notEmpty(config.axis_x_padding)) {
              paddingLeft = isValue(config.axis_x_padding.left) ? config.axis_x_padding.left : padding;
              paddingRight = isValue(config.axis_x_padding.right) ? config.axis_x_padding.right : padding;
          } else if (typeof config.axis_x_padding === 'number') {
              paddingLeft = paddingRight = config.axis_x_padding;
          } else {
              paddingLeft = paddingRight = padding;
          }
          return {left: paddingLeft, right: paddingRight};
      };
      c3_chart_internal_fn.getXDomain = function (targets) {
          var $$ = this,
              xDomain = [$$.getXDomainMin(targets), $$.getXDomainMax(targets)],
              firstX = xDomain[0], lastX = xDomain[1],
              padding = $$.getXDomainPadding(xDomain),
              min = 0, max = 0;
          // show center of x domain if min and max are the same
          if ((firstX - lastX) === 0 && !$$.isCategorized()) {
              if ($$.isTimeSeries()) {
                  firstX = new Date(firstX.getTime() * 0.5);
                  lastX = new Date(lastX.getTime() * 1.5);
              } else {
                  firstX = firstX === 0 ? 1 : (firstX * 0.5);
                  lastX = lastX === 0 ? -1 : (lastX * 1.5);
              }
          }
          if (firstX || firstX === 0) {
              min = $$.isTimeSeries() ? new Date(firstX.getTime() - padding.left) : firstX - padding.left;
          }
          if (lastX || lastX === 0) {
              max = $$.isTimeSeries() ? new Date(lastX.getTime() + padding.right) : lastX + padding.right;
          }
          return [min, max];
      };
      c3_chart_internal_fn.updateXDomain = function (targets, withUpdateXDomain, withUpdateOrgXDomain, withTrim, domain) {
          var $$ = this, config = $$.config;
  
          if (withUpdateOrgXDomain) {
              $$.x.domain(domain ? domain : $$.d3.extent($$.getXDomain(targets)));
              $$.orgXDomain = $$.x.domain();
              if (config.zoom_enabled) { $$.zoom.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(); }
          }
  
          // Trim domain when too big by zoom mousemove event
          if (withTrim) { $$.x.domain($$.trimXDomain($$.x.orgDomain())); }
  
          return $$.x.domain();
      };
      c3_chart_internal_fn.trimXDomain = function (domain) {
          var $$ = this;
          if (domain[0] <= $$.orgXDomain[0]) {
              domain[1] = +domain[1] + ($$.orgXDomain[0] - domain[0]);
              domain[0] = $$.orgXDomain[0];
          }
          if ($$.orgXDomain[1] <= domain[1]) {
              domain[0] = +domain[0] - (domain[1] - $$.orgXDomain[1]);
              domain[1] = $$.orgXDomain[1];
          }
          return 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));
      };
      c3_chart_internal_fn.isNotX = function (key) {
          return !this.isX(key);
      };
      c3_chart_internal_fn.getXKey = function (id) {
          var $$ = this, config = $$.config;
          return config.data_x ? config.data_x : notEmpty(config.data_xs) ? config.data_xs[id] : null;
      };
      c3_chart_internal_fn.getXValuesOfXKey = function (key, targets) {
          var $$ = this,
              xValues, ids = targets && notEmpty(targets) ? $$.mapToIds(targets) : [];
          ids.forEach(function (id) {
              if ($$.getXKey(id) === key) {
                  xValues = $$.data.xs[id];
              }
          });
          return xValues;
      };
      c3_chart_internal_fn.getIndexByX = function (x) {
          var $$ = this,
              data = $$.filterByX($$.data.targets, x);
          return data.length ? data[0].index : null;
      };
      c3_chart_internal_fn.getXValue = function (id, i) {
          var $$ = this;
          return id in $$.data.xs && $$.data.xs[id] && isValue($$.data.xs[id][i]) ? $$.data.xs[id][i] : i;
      };
      c3_chart_internal_fn.getOtherTargetXs = function () {
          var $$ = this,
              idsForX = Object.keys($$.data.xs);
          return idsForX.length ? $$.data.xs[idsForX[0]] : null;
      };
      c3_chart_internal_fn.getOtherTargetX = function (index) {
          var xs = this.getOtherTargetXs();
          return xs && index < xs.length ? xs[index] : null;
      };
      c3_chart_internal_fn.addXs = function (xs) {
          var $$ = this;
          Object.keys(xs).forEach(function (id) {
              $$.config.data_xs[id] = xs[id];
          });
      };
      c3_chart_internal_fn.hasMultipleX = function (xs) {
          return this.d3.set(Object.keys(xs).map(function (id) { return xs[id]; })).size() > 1;
      };
      c3_chart_internal_fn.isMultipleX = function () {
          return notEmpty(this.config.data_xs) || !this.config.data_xSort || this.hasType('scatter');
      };
      c3_chart_internal_fn.addName = function (data) {
          var $$ = this, name;
          if (data) {
              name = $$.config.data_names[data.id];
              data.name = name ? name : data.id;
          }
          return data;
      };
      c3_chart_internal_fn.getValueOnIndex = function (values, index) {
          var valueOnIndex = values.filter(function (v) { return v.index === index; });
          return valueOnIndex.length ? valueOnIndex[0] : null;
      };
      c3_chart_internal_fn.updateTargetX = function (targets, x) {
          var $$ = this;
          targets.forEach(function (t) {
              t.values.forEach(function (v, i) {
                  v.x = $$.generateTargetX(x[i], t.id, i);
              });
              $$.data.xs[t.id] = x;
          });
      };
      c3_chart_internal_fn.updateTargetXs = function (targets, xs) {
          var $$ = this;
          targets.forEach(function (t) {
              if (xs[t.id]) {
                  $$.updateTargetX([t], xs[t.id]);
              }
          });
      };
      c3_chart_internal_fn.generateTargetX = function (rawX, id, index) {
          var $$ = this, x;
          if ($$.isTimeSeries()) {
              x = rawX ? $$.parseDate(rawX) : $$.parseDate($$.getXValue(id, index));
          }
          else if ($$.isCustomX() && !$$.isCategorized()) {
              x = isValue(rawX) ? +rawX : $$.getXValue(id, index);
          }
          else {
              x = index;
          }
          return x;
      };
      c3_chart_internal_fn.cloneTarget = function (target) {
          return {
              id : target.id,
              id_org : target.id_org,
              values : target.values.map(function (d) {
                  return {x: d.x, value: d.value, id: d.id};
              })
          };
      };
      c3_chart_internal_fn.updateXs = function () {
          var $$ = this;
          if ($$.data.targets.length) {
              $$.xs = [];
              $$.data.targets[0].values.forEach(function (v) {
                  $$.xs[v.index] = v.x;
              });
          }
      };
      c3_chart_internal_fn.getPrevX = function (i) {
          var x = this.xs[i - 1];
          return typeof x !== 'undefined' ? x : null;
      };
      c3_chart_internal_fn.getNextX = function (i) {
          var x = this.xs[i + 1];
          return typeof x !== 'undefined' ? x : null;
      };
      c3_chart_internal_fn.getMaxDataCount = function () {
          var $$ = this;
          return $$.d3.max($$.data.targets, function (t) { return t.values.length; });
      };
      c3_chart_internal_fn.getMaxDataCountTarget = function (targets) {
          var length = targets.length, max = 0, maxTarget;
          if (length > 1) {
              targets.forEach(function (t) {
                  if (t.values.length > max) {
                      maxTarget = t;
                      max = t.values.length;
                  }
              });
          } else {
              maxTarget = length ? targets[0] : null;
          }
          return maxTarget;
      };
      c3_chart_internal_fn.getEdgeX = function (targets) {
          var $$ = this;
          return !targets.length ? [0, 0] : [
              $$.d3.min(targets, function (t) { return t.values[0].x; }),
              $$.d3.max(targets, function (t) { return t.values[t.values.length - 1].x; })
          ];
      };
      c3_chart_internal_fn.mapToIds = function (targets) {
          return targets.map(function (d) { return d.id; });
      };
      c3_chart_internal_fn.mapToTargetIds = function (ids) {
          var $$ = this;
          return ids ? (isString(ids) ? [ids] : ids) : $$.mapToIds($$.data.targets);
      };
      c3_chart_internal_fn.hasTarget = function (targets, id) {
          var ids = this.mapToIds(targets), i;
          for (i = 0; i < ids.length; i++) {
              if (ids[i] === id) {
                  return true;
              }
          }
          return false;
      };
      c3_chart_internal_fn.isTargetToShow = function (targetId) {
          return this.hiddenTargetIds.indexOf(targetId) < 0;
      };
      c3_chart_internal_fn.isLegendToShow = function (targetId) {
          return this.hiddenLegendIds.indexOf(targetId) < 0;
      };
      c3_chart_internal_fn.filterTargetsToShow = function (targets) {
          var $$ = this;
          return targets.filter(function (t) { return $$.isTargetToShow(t.id); });
      };
      c3_chart_internal_fn.mapTargetsToUniqueXs = function (targets) {
          var $$ = this;
          var xs = $$.d3.set($$.d3.merge(targets.map(function (t) { return t.values.map(function (v) { return +v.x; }); }))).values();
          return $$.isTimeSeries() ? xs.map(function (x) { return new Date(+x); }) : xs.map(function (x) { return +x; });
      };
      c3_chart_internal_fn.addHiddenTargetIds = function (targetIds) {
          this.hiddenTargetIds = this.hiddenTargetIds.concat(targetIds);
      };
      c3_chart_internal_fn.removeHiddenTargetIds = function (targetIds) {
          this.hiddenTargetIds = this.hiddenTargetIds.filter(function (id) { return targetIds.indexOf(id) < 0; });
      };
      c3_chart_internal_fn.addHiddenLegendIds = function (targetIds) {
          this.hiddenLegendIds = this.hiddenLegendIds.concat(targetIds);
      };
      c3_chart_internal_fn.removeHiddenLegendIds = function (targetIds) {
          this.hiddenLegendIds = this.hiddenLegendIds.filter(function (id) { return targetIds.indexOf(id) < 0; });
      };
      c3_chart_internal_fn.getValuesAsIdKeyed = function (targets) {
          var ys = {};
          targets.forEach(function (t) {
              ys[t.id] = [];
              t.values.forEach(function (v) {
                  ys[t.id].push(v.value);
              });
          });
          return ys;
      };
      c3_chart_internal_fn.checkValueInTargets = function (targets, checker) {
          var ids = Object.keys(targets), i, j, values;
          for (i = 0; i < ids.length; i++) {
              values = targets[ids[i]].values;
              for (j = 0; j < values.length; j++) {
                  if (checker(values[j].value)) {
                      return true;
                  }
              }
          }
          return false;
      };
      c3_chart_internal_fn.hasNegativeValueInTargets = function (targets) {
          return this.checkValueInTargets(targets, function (v) { return v < 0; });
      };
      c3_chart_internal_fn.hasPositiveValueInTargets = function (targets) {
          return this.checkValueInTargets(targets, function (v) { return v > 0; });
      };
      c3_chart_internal_fn.isOrderDesc = function () {
          var config = this.config;
          return typeof(config.data_order) === 'string' && config.data_order.toLowerCase() === 'desc';
      };
      c3_chart_internal_fn.isOrderAsc = function () {
          var config = this.config;
          return typeof(config.data_order) === 'string' && config.data_order.toLowerCase() === 'asc';
      };
      c3_chart_internal_fn.orderTargets = function (targets) {
          var $$ = this, config = $$.config, orderAsc = $$.isOrderAsc(), orderDesc = $$.isOrderDesc();
          if (orderAsc || orderDesc) {
              targets.sort(function (t1, t2) {
                  var reducer = function (p, c) { return p + Math.abs(c.value); };
                  var t1Sum = t1.values.reduce(reducer, 0),
                      t2Sum = t2.values.reduce(reducer, 0);
                  return orderAsc ? t2Sum - t1Sum : t1Sum - t2Sum;
              });
          } else if (isFunction(config.data_order)) {
              targets.sort(config.data_order);
          } // TODO: accept name array for order
          return targets;
      };
      c3_chart_internal_fn.filterByX = function (targets, x) {
          return this.d3.merge(targets.map(function (t) { return t.values; })).filter(function (v) { return v.x - x === 0; });
      };
      c3_chart_internal_fn.filterRemoveNull = function (data) {
          return data.filter(function (d) { return isValue(d.value); });
      };
      c3_chart_internal_fn.filterByXDomain = function (targets, xDomain) {
          return targets.map(function (t) {
              return {
                  id: t.id,
                  id_org: t.id_org,
                  values: t.values.filter(function (v) {
                      return xDomain[0] <= v.x && v.x <= xDomain[1];
                  })
              };
          });
      };
      c3_chart_internal_fn.hasDataLabel = function () {
          var config = this.config;
          if (typeof config.data_labels === 'boolean' && config.data_labels) {
              return true;
          } else if (typeof config.data_labels === 'object' && notEmpty(config.data_labels)) {
              return true;
          }
          return false;
      };
      c3_chart_internal_fn.getDataLabelLength = function (min, max, key) {
          var $$ = this,
              lengths = [0, 0], paddingCoef = 1.3;
          $$.selectChart.select('svg').selectAll('.dummy')
              .data([min, max])
              .enter().append('text')
              .text(function (d) { return $$.dataLabelFormat(d.id)(d); })
              .each(function (d, i) {
                  lengths[i] = this.getBoundingClientRect()[key] * paddingCoef;
              })
              .remove();
          return lengths;
      };
      c3_chart_internal_fn.isNoneArc = function (d) {
          return this.hasTarget(this.data.targets, d.id);
      },
      c3_chart_internal_fn.isArc = function (d) {
          return 'data' in d && this.hasTarget(this.data.targets, d.data.id);
      };
      c3_chart_internal_fn.findSameXOfValues = function (values, index) {
          var i, targetX = values[index].x, sames = [];
          for (i = index - 1; i >= 0; i--) {
              if (targetX !== values[i].x) { break; }
              sames.push(values[i]);
          }
          for (i = index; i < values.length; i++) {
              if (targetX !== values[i].x) { break; }
              sames.push(values[i]);
          }
          return sames;
      };
  
      c3_chart_internal_fn.findClosestFromTargets = function (targets, pos) {
          var $$ = this, candidates;
  
          // map to array of closest points of each target
          candidates = targets.map(function (target) {
              return $$.findClosest(target.values, pos);
          });
  
          // decide closest point and return
          return $$.findClosest(candidates, pos);
      };
      c3_chart_internal_fn.findClosest = function (values, pos) {
          var $$ = this, minDist = 100, closest;
  
          // find mouseovering bar
          values.filter(function (v) { return v && $$.isBarType(v.id); }).forEach(function (v) {
              var shape = $$.main.select('.' + CLASS.bars + $$.getTargetSelectorSuffix(v.id) + ' .' + CLASS.bar + '-' + v.index).node();
              if (!closest && $$.isWithinBar(shape)) {
                  closest = v;
              }
          });
  
          // find closest point from non-bar
          values.filter(function (v) { return v && !$$.isBarType(v.id); }).forEach(function (v) {
              var d = $$.dist(v, pos);
              if (d < minDist) {
                  minDist = d;
                  closest = v;
              }
          });
  
          return closest;
      };
      c3_chart_internal_fn.dist = function (data, pos) {
          var $$ = this, config = $$.config,
              xIndex = config.axis_rotated ? 1 : 0,
              yIndex = config.axis_rotated ? 0 : 1,
              y = $$.circleY(data, data.index),
              x = $$.x(data.x);
          return Math.pow(x - pos[xIndex], 2) + Math.pow(y - pos[yIndex], 2);
      };
      c3_chart_internal_fn.convertValuesToStep = function (values) {
          var converted = [].concat(values), i;
  
          if (!this.isCategorized()) {
              return values;
          }
  
          for (i = values.length + 1; 0 < i; i--) {
              converted[i] = converted[i - 1];
          }
  
          converted[0] = {
              x: converted[0].x - 1,
              value: converted[0].value,
              id: converted[0].id
          };
          converted[values.length + 1] = {
              x: converted[values.length].x + 1,
              value: converted[values.length].value,
              id: converted[values.length].id
          };
  
          return converted;
      };
      c3_chart_internal_fn.updateDataAttributes = function (name, attrs) {
          var $$ = this, config = $$.config, current = config['data_' + name];
          if (typeof attrs === 'undefined') { return current; }
          Object.keys(attrs).forEach(function (id) {
              current[id] = attrs[id];
          });
          $$.redraw({withLegend: true});
          return current;
      };
  
      c3_chart_internal_fn.convertUrlToData = function (url, mimeType, keys, done) {
          var $$ = this, type = mimeType ? mimeType : 'csv';
          $$.d3.xhr(url, function (error, data) {
              var d;
              if (!data) {
                  throw new Error(error.responseURL + ' ' + error.status + ' (' + error.statusText + ')');
              }
              if (type === 'json') {
                  d = $$.convertJsonToData(JSON.parse(data.response), keys);
              } else if (type === 'tsv') {
                  d = $$.convertTsvToData(data.response);
              } else {
                  d = $$.convertCsvToData(data.response);
              }
              done.call($$, d);
          });
      };
      c3_chart_internal_fn.convertXsvToData = function (xsv, parser) {
          var rows = parser.parseRows(xsv), d;
          if (rows.length === 1) {
              d = [{}];
              rows[0].forEach(function (id) {
                  d[0][id] = null;
              });
          } else {
              d = parser.parse(xsv);
          }
          return d;
      };
      c3_chart_internal_fn.convertCsvToData = function (csv) {
          return this.convertXsvToData(csv, this.d3.csv);
      };
      c3_chart_internal_fn.convertTsvToData = function (tsv) {
          return this.convertXsvToData(tsv, this.d3.tsv);
      };
      c3_chart_internal_fn.convertJsonToData = function (json, keys) {
          var $$ = this,
              new_rows = [], targetKeys, data;
          if (keys) { // when keys specified, json would be an array that includes objects
              if (keys.x) {
                  targetKeys = keys.value.concat(keys.x);
                  $$.config.data_x = keys.x;
              } else {
                  targetKeys = keys.value;
              }
              new_rows.push(targetKeys);
              json.forEach(function (o) {
                  var new_row = [];
                  targetKeys.forEach(function (key) {
                      // convert undefined to null because undefined data will be removed in convertDataToTargets()
                      var v = isUndefined(o[key]) ? null : o[key];
                      new_row.push(v);
                  });
                  new_rows.push(new_row);
              });
              data = $$.convertRowsToData(new_rows);
          } else {
              Object.keys(json).forEach(function (key) {
                  new_rows.push([key].concat(json[key]));
              });
              data = $$.convertColumnsToData(new_rows);
          }
          return data;
      };
      c3_chart_internal_fn.convertRowsToData = function (rows) {
          var keys = rows[0], new_row = {}, new_rows = [], i, j;
          for (i = 1; i < rows.length; i++) {
              new_row = {};
              for (j = 0; j < rows[i].length; j++) {
                  if (isUndefined(rows[i][j])) {
                      throw new Error("Source data is missing a component at (" + i + "," + j + ")!");
                  }
                  new_row[keys[j]] = rows[i][j];
              }
              new_rows.push(new_row);
          }
          return new_rows;
      };
      c3_chart_internal_fn.convertColumnsToData = function (columns) {
          var new_rows = [], i, j, key;
          for (i = 0; i < columns.length; i++) {
              key = columns[i][0];
              for (j = 1; j < columns[i].length; j++) {
                  if (isUndefined(new_rows[j - 1])) {
                      new_rows[j - 1] = {};
                  }
                  if (isUndefined(columns[i][j])) {
                      throw new Error("Source data is missing a component at (" + i + "," + j + ")!");
                  }
                  new_rows[j - 1][key] = columns[i][j];
              }
          }
          return new_rows;
      };
      c3_chart_internal_fn.convertDataToTargets = function (data, appendXs) {
          var $$ = this, config = $$.config,
              ids = $$.d3.keys(data[0]).filter($$.isNotX, $$),
              xs = $$.d3.keys(data[0]).filter($$.isX, $$),
              targets;
  
          // save x for update data by load when custom x and c3.x API
          ids.forEach(function (id) {
              var xKey = $$.getXKey(id);
  
              if ($$.isCustomX() || $$.isTimeSeries()) {
                  // if included in input data
                  if (xs.indexOf(xKey) >= 0) {
                      $$.data.xs[id] = (appendXs && $$.data.xs[id] ? $$.data.xs[id] : []).concat(
                          data.map(function (d) { return d[xKey]; })
                              .filter(isValue)
                              .map(function (rawX, i) { return $$.generateTargetX(rawX, id, i); })
                      );
                  }
                  // if not included in input data, find from preloaded data of other id's x
                  else if (config.data_x) {
                      $$.data.xs[id] = $$.getOtherTargetXs();
                  }
                  // if not included in input data, find from preloaded data
                  else if (notEmpty(config.data_xs)) {
                      $$.data.xs[id] = $$.getXValuesOfXKey(xKey, $$.data.targets);
                  }
                  // MEMO: if no x included, use same x of current will be used
              } else {
                  $$.data.xs[id] = data.map(function (d, i) { return i; });
              }
          });
  
  
          // check x is defined
          ids.forEach(function (id) {
              if (!$$.data.xs[id]) {
                  throw new Error('x is not defined for id = "' + id + '".');
              }
          });
  
          // convert to target
          targets = ids.map(function (id, index) {
              var convertedId = config.data_idConverter(id);
              return {
                  id: convertedId,
                  id_org: id,
                  values: data.map(function (d, i) {
                      var xKey = $$.getXKey(id), rawX = d[xKey], x = $$.generateTargetX(rawX, id, i);
                      // use x as categories if custom x and categorized
                      if ($$.isCustomX() && $$.isCategorized() && index === 0 && rawX) {
                          if (i === 0) { config.axis_x_categories = []; }
                          config.axis_x_categories.push(rawX);
                      }
                      // mark as x = undefined if value is undefined and filter to remove after mapped
                      if (isUndefined(d[id]) || $$.data.xs[id].length <= i) {
                          x = undefined;
                      }
                      return {x: x, value: d[id] !== null && !isNaN(d[id]) ? +d[id] : null, id: convertedId};
                  }).filter(function (v) { return isDefined(v.x); })
              };
          });
  
          // finish targets
          targets.forEach(function (t) {
              var i;
              // sort values by its x
              if (config.data_xSort) {
                  t.values = t.values.sort(function (v1, v2) {
                      var x1 = v1.x || v1.x === 0 ? v1.x : Infinity,
                          x2 = v2.x || v2.x === 0 ? v2.x : Infinity;
                      return x1 - x2;
                  });
              }
              // indexing each value
              i = 0;
              t.values.forEach(function (v) {
                  v.index = i++;
              });
              // this needs to be sorted because its index and value.index is identical
              $$.data.xs[t.id].sort(function (v1, v2) {
                  return v1 - v2;
              });
          });
  
          // set target types
          if (config.data_type) {
              $$.setTargetType($$.mapToIds(targets).filter(function (id) { return ! (id in config.data_types); }), config.data_type);
          }
  
          // cache as original id keyed
          targets.forEach(function (d) {
              $$.addCache(d.id_org, d);
          });
  
          return targets;
      };
  
      c3_chart_internal_fn.load = function (targets, args) {
          var $$ = this;
          if (targets) {
              // filter loading targets if needed
              if (args.filter) {
                  targets = targets.filter(args.filter);
              }
              // set type if args.types || args.type specified
              if (args.type || args.types) {
                  targets.forEach(function (t) {
                      $$.setTargetType(t.id, args.types ? args.types[t.id] : args.type);
                  });
              }
              // Update/Add data
              $$.data.targets.forEach(function (d) {
                  for (var i = 0; i < targets.length; i++) {
                      if (d.id === targets[i].id) {
                          d.values = targets[i].values;
                          targets.splice(i, 1);
                          break;
                      }
                  }
              });
              $$.data.targets = $$.data.targets.concat(targets); // add remained
          }
  
          // Set targets
          $$.updateTargets($$.data.targets);
  
          // Redraw with new targets
          $$.redraw({withUpdateOrgXDomain: true, withUpdateXDomain: true, withLegend: true});
  
          if (args.done) { args.done(); }
      };
      c3_chart_internal_fn.loadFromArgs = function (args) {
          var $$ = this;
          if (args.data) {
              $$.load($$.convertDataToTargets(args.data), args);
          }
          else if (args.url) {
              $$.convertUrlToData(args.url, args.mimeType, args.keys, function (data) {
                  $$.load($$.convertDataToTargets(data), args);
              });
          }
          else if (args.json) {
              $$.load($$.convertDataToTargets($$.convertJsonToData(args.json, args.keys)), args);
          }
          else if (args.rows) {
              $$.load($$.convertDataToTargets($$.convertRowsToData(args.rows)), args);
          }
          else if (args.columns) {
              $$.load($$.convertDataToTargets($$.convertColumnsToData(args.columns)), args);
          }
          else {
              $$.load(null, args);
          }
      };
      c3_chart_internal_fn.unload = function (targetIds, done) {
          var $$ = this;
          if (!done) {
              done = function () {};
          }
          // filter existing target
          targetIds = targetIds.filter(function (id) { return $$.hasTarget($$.data.targets, id); });
          // If no target, call done and return
          if (!targetIds || targetIds.length === 0) {
              done();
              return;
          }
          $$.svg.selectAll(targetIds.map(function (id) { return $$.selectorTarget(id); }))
              .transition()
              .style('opacity', 0)
              .remove()
              .call($$.endall, done);
          targetIds.forEach(function (id) {
              // Reset fadein for future load
              $$.withoutFadeIn[id] = false;
              // Remove target's elements
              if ($$.legend) {
                  $$.legend.selectAll('.' + CLASS.legendItem + $$.getTargetSelectorSuffix(id)).remove();
              }
              // Remove target
              $$.data.targets = $$.data.targets.filter(function (t) {
                  return t.id !== id;
              });
          });
      };
  
      c3_chart_internal_fn.categoryName = function (i) {
          var config = this.config;
          return i < config.axis_x_categories.length ? config.axis_x_categories[i] : i;
      };
  
      c3_chart_internal_fn.initEventRect = function () {
          var $$ = this;
          $$.main.select('.' + CLASS.chart).append("g")
              .attr("class", CLASS.eventRects)
              .style('fill-opacity', 0);
      };
      c3_chart_internal_fn.redrawEventRect = function () {
          var $$ = this, config = $$.config,
              eventRectUpdate, maxDataCountTarget,
              isMultipleX = $$.isMultipleX();
  
          // rects for mouseover
          var eventRects = $$.main.select('.' + CLASS.eventRects)
                  .style('cursor', config.zoom_enabled ? config.axis_rotated ? 'ns-resize' : 'ew-resize' : null)
                  .classed(CLASS.eventRectsMultiple, isMultipleX)
                  .classed(CLASS.eventRectsSingle, !isMultipleX);
  
          // clear old rects
          eventRects.selectAll('.' + CLASS.eventRect).remove();
  
          // open as public variable
          $$.eventRect = eventRects.selectAll('.' + CLASS.eventRect);
  
          if (isMultipleX) {
              eventRectUpdate = $$.eventRect.data([0]);
              // enter : only one rect will be added
              $$.generateEventRectsForMultipleXs(eventRectUpdate.enter());
              // update
              $$.updateEventRect(eventRectUpdate);
              // exit : not needed because always only one rect exists
          }
          else {
              // Set data and update $$.eventRect
              maxDataCountTarget = $$.getMaxDataCountTarget($$.data.targets);
              eventRects.datum(maxDataCountTarget ? maxDataCountTarget.values : []);
              $$.eventRect = eventRects.selectAll('.' + CLASS.eventRect);
              eventRectUpdate = $$.eventRect.data(function (d) { return d; });
              // enter
              $$.generateEventRectsForSingleX(eventRectUpdate.enter());
              // update
              $$.updateEventRect(eventRectUpdate);
              // exit
              eventRectUpdate.exit().remove();
          }
      };
      c3_chart_internal_fn.updateEventRect = function (eventRectUpdate) {
          var $$ = this, config = $$.config,
              x, y, w, h, rectW, rectX;
  
          // set update selection if null
          eventRectUpdate = eventRectUpdate || $$.eventRect.data(function (d) { return d; });
  
          if ($$.isMultipleX()) {
              // TODO: rotated not supported yet
              x = 0;
              y = 0;
              w = $$.width;
              h = $$.height;
          }
          else {
              if (($$.isCustomX() || $$.isTimeSeries()) && !$$.isCategorized()) {
  
                  // update index for x that is used by prevX and nextX
                  $$.updateXs();
  
                  rectW = function (d) {
                      var prevX = $$.getPrevX(d.index), nextX = $$.getNextX(d.index);
  
                      // if there this is a single data point make the eventRect full width (or height)
                      if (prevX === null && nextX === null) {
                          return config.axis_rotated ? $$.height : $$.width;
                      }
  
                      if (prevX === null) { prevX = $$.x.domain()[0]; }
                      if (nextX === null) { nextX = $$.x.domain()[1]; }
  
                      return Math.max(0, ($$.x(nextX) - $$.x(prevX)) / 2);
                  };
                  rectX = function (d) {
                      var prevX = $$.getPrevX(d.index), nextX = $$.getNextX(d.index),
                          thisX = $$.data.xs[d.id][d.index];
  
                      // if there this is a single data point position the eventRect at 0
                      if (prevX === null && nextX === null) {
                          return 0;
                      }
  
                      if (prevX === null) { prevX = $$.x.domain()[0]; }
  
                      return ($$.x(thisX) + $$.x(prevX)) / 2;
                  };
              } else {
                  rectW = $$.getEventRectWidth();
                  rectX = function (d) {
                      return $$.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;
          }
  
          eventRectUpdate
              .attr('class', $$.classEvent.bind($$))
              .attr("x", x)
              .attr("y", y)
              .attr("width", w)
              .attr("height", h);
      };
      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)
              .on('mouseover', function (d) {
                  var index = d.index;
  
                  if ($$.dragging || $$.flowing) { return; } // do nothing while dragging/flowing
                  if ($$.hasArcType()) { return; }
  
                  // Expand shapes for selection
                  if (config.point_focus_expand_enabled) { $$.expandCircles(index, null, true); }
                  $$.expandBars(index, null, true);
  
                  // Call event handler
                  $$.main.selectAll('.' + CLASS.shape + '-' + index).each(function (d) {
                      config.data_onmouseover.call($$.api, d);
                  });
              })
              .on('mouseout', function (d) {
                  var index = d.index;
                  if (!$$.config) { return; } // chart is destroyed
                  if ($$.hasArcType()) { return; }
                  $$.hideXGridFocus();
                  $$.hideTooltip();
                  // Undo expanded shapes
                  $$.unexpandCircles();
                  $$.unexpandBars();
                  // Call event handler
                  $$.main.selectAll('.' + CLASS.shape + '-' + index).each(function (d) {
                      config.data_onmouseout.call($$.api, d);
                  });
              })
              .on('mousemove', function (d) {
                  var selectedData, index = d.index,
                      eventRect = $$.svg.select('.' + CLASS.eventRect + '-' + index);
  
                  if ($$.dragging || $$.flowing) { return; } // do nothing while dragging/flowing
                  if ($$.hasArcType()) { return; }
  
                  if ($$.isStepType(d) && $$.config.line_step_type === 'step-after' && d3.mouse(this)[0] < $$.x($$.getXValue(d.id, index))) {
                      index -= 1;
                  }
  
                  // Show tooltip
                  selectedData = $$.filterTargetsToShow($$.data.targets).map(function (t) {
                      return $$.addName($$.getValueOnIndex(t.values, index));
                  });
  
                  if (config.tooltip_grouped) {
                      $$.showTooltip(selectedData, this);
                      $$.showXGridFocus(selectedData);
                  }
  
                  if (config.tooltip_grouped && (!config.data_selection_enabled || config.data_selection_grouped)) {
                      return;
                  }
  
                  $$.main.selectAll('.' + CLASS.shape + '-' + index)
                      .each(function () {
                          d3.select(this).classed(CLASS.EXPANDED, true);
                          if (config.data_selection_enabled) {
                              eventRect.style('cursor', config.data_selection_grouped ? 'pointer' : null);
                          }
                          if (!config.tooltip_grouped) {
                              $$.hideXGridFocus();
                              $$.hideTooltip();
                              if (!config.data_selection_grouped) {
                                  $$.unexpandCircles(index);
                                  $$.unexpandBars(index);
                              }
                          }
                      })
                      .filter(function (d) {
                          return $$.isWithinShape(this, d);
                      })
                      .each(function (d) {
                          if (config.data_selection_enabled && (config.data_selection_grouped || config.data_selection_isselectable(d))) {
                              eventRect.style('cursor', 'pointer');
                          }
                          if (!config.tooltip_grouped) {
                              $$.showTooltip([d], this);
                              $$.showXGridFocus([d]);
                              if (config.point_focus_expand_enabled) { $$.expandCircles(index, d.id, true); }
                              $$.expandBars(index, d.id, true);
                          }
                      });
              })
              .on('click', function (d) {
                  var index = d.index;
                  if ($$.hasArcType() || !$$.toggleShape) { return; }
                  if ($$.cancelClick) {
                      $$.cancelClick = false;
                      return;
                  }
                  if ($$.isStepType(d) && config.line_step_type === 'step-after' && d3.mouse(this)[0] < $$.x($$.getXValue(d.id, index))) {
                      index -= 1;
                  }
                  $$.main.selectAll('.' + CLASS.shape + '-' + index).each(function (d) {
                      if (config.data_selection_grouped || $$.isWithinShape(this, d)) {
                          $$.toggleShape(this, d, index);
                          $$.config.data_onclick.call($$.api, d, this);
                      }
                  });
              })
              .call(
                  config.data_selection_draggable && $$.drag ? (
                      d3.behavior.drag().origin(Object)
                          .on('drag', function () { $$.drag(d3.mouse(this)); })
                          .on('dragstart', function () { $$.dragstart(d3.mouse(this)); })
                          .on('dragend', function () { $$.dragend(); })
                  ) : function () {}
              );
      };
  
      c3_chart_internal_fn.generateEventRectsForMultipleXs = function (eventRectEnter) {
          var $$ = this, d3 = $$.d3, config = $$.config;
  
          function mouseout() {
              $$.svg.select('.' + CLASS.eventRect).style('cursor', null);
              $$.hideXGridFocus();
              $$.hideTooltip();
              $$.unexpandCircles();
              $$.unexpandBars();
          }
  
          eventRectEnter.append('rect')
              .attr('x', 0)
              .attr('y', 0)
              .attr('width', $$.width)
              .attr('height', $$.height)
              .attr('class', CLASS.eventRect)
              .on('mouseout', function () {
                  if (!$$.config) { return; } // chart is destroyed
                  if ($$.hasArcType()) { return; }
                  mouseout();
              })
              .on('mousemove', function () {
                  var targetsToShow = $$.filterTargetsToShow($$.data.targets);
                  var mouse, closest, sameXData, selectedData;
  
                  if ($$.dragging) { return; } // do nothing when dragging
                  if ($$.hasArcType(targetsToShow)) { return; }
  
                  mouse = d3.mouse(this);
                  closest = $$.findClosestFromTargets(targetsToShow, mouse);
  
                  if ($$.mouseover && (!closest || closest.id !== $$.mouseover.id)) {
                      config.data_onmouseout.call($$.api, $$.mouseover);
                      $$.mouseover = undefined;
                  }
  
                  if (! closest) {
                      mouseout();
                      return;
                  }
  
                  if ($$.isScatterType(closest) || !config.tooltip_grouped) {
                      sameXData = [closest];
                  } else {
                      sameXData = $$.filterByX(targetsToShow, closest.x);
                  }
  
                  // show tooltip when cursor is close to some point
                  selectedData = sameXData.map(function (d) {
                      return $$.addName(d);
                  });
                  $$.showTooltip(selectedData, this);
  
                  // expand points
                  if (config.point_focus_expand_enabled) {
                      $$.expandCircles(closest.index, closest.id, true);
                  }
                  $$.expandBars(closest.index, closest.id, true);
  
                  // Show xgrid focus line
                  $$.showXGridFocus(selectedData);
  
                  // Show cursor as pointer if point is close to mouse position
                  if ($$.isBarType(closest.id) || $$.dist(closest, mouse) < 100) {
                      $$.svg.select('.' + CLASS.eventRect).style('cursor', 'pointer');
                      if (!$$.mouseover) {
                          config.data_onmouseover.call($$.api, closest);
                          $$.mouseover = closest;
                      }
                  }
              })
              .on('click', function () {
                  var targetsToShow = $$.filterTargetsToShow($$.data.targets);
                  var mouse, closest;
  
                  if ($$.hasArcType(targetsToShow)) { return; }
  
                  mouse = d3.mouse(this);
                  closest = $$.findClosestFromTargets(targetsToShow, mouse);
  
                  if (! closest) { return; }
  
                  // select if selection enabled
                  if ($$.isBarType(closest.id) || $$.dist(closest, mouse) < 100) {
                      $$.main.selectAll('.' + CLASS.shapes + $$.getTargetSelectorSuffix(closest.id)).selectAll('.' + CLASS.shape + '-' + closest.index).each(function () {
                          if (config.data_selection_grouped || $$.isWithinShape(this, closest)) {
                              $$.toggleShape(this, closest, closest.index);
                              $$.config.data_onclick.call($$.api, closest, this);
                          }
                      });
                  }
              })
              .call(
                  config.data_selection_draggable && $$.drag ? (
                      d3.behavior.drag().origin(Object)
                          .on('drag', function () { $$.drag(d3.mouse(this)); })
                          .on('dragstart', function () { $$.dragstart(d3.mouse(this)); })
                          .on('dragend', function () { $$.dragend(); })
                  ) : function () {}
              );
      };
      c3_chart_internal_fn.dispatchEvent = function (type, index, mouse) {
          var $$ = this,
              selector = '.' + CLASS.eventRect + (!$$.isMultipleX() ? '-' + index : ''),
              eventRect = $$.main.select(selector).node(),
              box = eventRect.getBoundingClientRect(),
              x = box.left + (mouse ? mouse[0] : 0),
              y = box.top + (mouse ? mouse[1] : 0),
              event = document.createEvent("MouseEvents");
  
          event.initMouseEvent(type, true, true, window, 0, x, y, x, y,
                               false, false, false, false, 0, null);
          eventRect.dispatchEvent(event);
      };
  
      c3_chart_internal_fn.getCurrentWidth = function () {
          var $$ = this, config = $$.config;
          return config.size_width ? config.size_width : $$.getParentWidth();
      };
      c3_chart_internal_fn.getCurrentHeight = function () {
          var $$ = this, config = $$.config,
              h = config.size_height ? config.size_height : $$.getParentHeight();
          return h > 0 ? h : 320 / ($$.hasType('gauge') ? 2 : 1);
      };
      c3_chart_internal_fn.getCurrentPaddingTop = function () {
          var config = this.config;
          return isValue(config.padding_top) ? config.padding_top : 0;
      };
      c3_chart_internal_fn.getCurrentPaddingBottom = function () {
          var config = this.config;
          return isValue(config.padding_bottom) ? config.padding_bottom : 0;
      };
      c3_chart_internal_fn.getCurrentPaddingLeft = function (withoutRecompute) {
          var $$ = this, config = $$.config;
          if (isValue(config.padding_left)) {
              return config.padding_left;
          } else if (config.axis_rotated) {
              return !config.axis_x_show ? 1 : Math.max(ceil10($$.getAxisWidthByAxisId('x', withoutRecompute)), 40);
          } else if (!config.axis_y_show || config.axis_y_inner) { // && !config.axis_rotated
              return $$.axis.getYAxisLabelPosition().isOuter ? 30 : 1;
          } else {
              return ceil10($$.getAxisWidthByAxisId('y', withoutRecompute));
          }
      };
      c3_chart_internal_fn.getCurrentPaddingRight = function () {
          var $$ = this, config = $$.config,
              defaultPadding = 10, legendWidthOnRight = $$.isLegendRight ? $$.getLegendWidth() + 20 : 0;
          if (isValue(config.padding_right)) {
              return config.padding_right + 1; // 1 is needed not to hide tick line
          } else if (config.axis_rotated) {
              return defaultPadding + legendWidthOnRight;
          } else if (!config.axis_y2_show || config.axis_y2_inner) { // && !config.axis_rotated
              return 2 + legendWidthOnRight + ($$.axis.getY2AxisLabelPosition().isOuter ? 20 : 0);
          } else {
              return ceil10($$.getAxisWidthByAxisId('y2')) + legendWidthOnRight;
          }
      };
  
      c3_chart_internal_fn.getParentRectValue = function (key) {
          var parent = this.selectChart.node(), v;
          while (parent && parent.tagName !== 'BODY') {
              try {
                  v = parent.getBoundingClientRect()[key];
              } catch(e) {
                  if (key === 'width') {
                      // In IE in certain cases getBoundingClientRect
                      // will cause an "unspecified error"
                      v = parent.offsetWidth;
                  }
              }
              if (v) {
                  break;
              }
              parent = parent.parentNode;
          }
          return v;
      };
      c3_chart_internal_fn.getParentWidth = function () {
          return this.getParentRectValue('width');
      };
      c3_chart_internal_fn.getParentHeight = function () {
          var h = this.selectChart.style('height');
          return h.indexOf('px') > 0 ? +h.replace('px', '') : 0;
      };
  
  
      c3_chart_internal_fn.getSvgLeft = function (withoutRecompute) {
          var $$ = this, config = $$.config,
              hasLeftAxisRect = config.axis_rotated || (!config.axis_rotated && !config.axis_y_inner),
              leftAxisClass = config.axis_rotated ? CLASS.axisX : CLASS.axisY,
              leftAxis = $$.main.select('.' + leftAxisClass).node(),
              svgRect = leftAxis && hasLeftAxisRect ? leftAxis.getBoundingClientRect() : {right: 0},
              chartRect = $$.selectChart.node().getBoundingClientRect(),
              hasArc = $$.hasArcType(),
              svgLeft = svgRect.right - chartRect.left - (hasArc ? 0 : $$.getCurrentPaddingLeft(withoutRecompute));
          return svgLeft > 0 ? svgLeft : 0;
      };
  
  
      c3_chart_internal_fn.getAxisWidthByAxisId = function (id, withoutRecompute) {
          var $$ = this, position = $$.axis.getLabelPositionById(id);
          return $$.axis.getMaxTickWidth(id, withoutRecompute) + (position.isInner ? 20 : 40);
      };
      c3_chart_internal_fn.getHorizontalAxisHeight = function (axisId) {
          var $$ = this, config = $$.config, h = 30;
          if (axisId === 'x' && !config.axis_x_show) { return 8; }
          if (axisId === 'x' && config.axis_x_height) { return config.axis_x_height; }
          if (axisId === 'y' && !config.axis_y_show) { return config.legend_show && !$$.isLegendRight && !$$.isLegendInset ? 10 : 1; }
          if (axisId === 'y2' && !config.axis_y2_show) { return $$.rotated_padding_top; }
          // Calculate x axis height when tick rotated
          if (axisId === 'x' && !config.axis_rotated && config.axis_x_tick_rotate) {
              h = $$.axis.getMaxTickWidth(axisId) * Math.cos(Math.PI * (90 - config.axis_x_tick_rotate) / 180);
          }
          return h + ($$.axis.getLabelPositionById(axisId).isInner ? 0 : 10) + (axisId === 'y2' ? -10 : 0);
      };
  
      c3_chart_internal_fn.getEventRectWidth = function () {
          return this.xAxis.tickInterval();
      };
  
      c3_chart_internal_fn.getShapeIndices = function (typeFilter) {
          var $$ = this, config = $$.config,
              indices = {}, i = 0, j, k;
          $$.filterTargetsToShow($$.data.targets.filter(typeFilter, $$)).forEach(function (d) {
              for (j = 0; j < config.data_groups.length; j++) {
                  if (config.data_groups[j].indexOf(d.id) < 0) { continue; }
                  for (k = 0; k < config.data_groups[j].length; k++) {
                      if (config.data_groups[j][k] in indices) {
                          indices[d.id] = indices[config.data_groups[j][k]];
                          break;
                      }
                  }
              }
              if (isUndefined(indices[d.id])) { indices[d.id] = i++; }
          });
          indices.__max__ = i - 1;
          return indices;
      };
      c3_chart_internal_fn.getShapeX = function (offset, targetsNum, indices, isSub) {
          var $$ = this, scale = isSub ? $$.subX : $$.x;
          return function (d) {
              var index = d.id in indices ? indices[d.id] : 0;
              return d.x || d.x === 0 ? scale(d.x) - offset * (targetsNum / 2 - index) : 0;
          };
      };
      c3_chart_internal_fn.getShapeY = function (isSub) {
          var $$ = this;
          return function (d) {
              var scale = isSub ? $$.getSubYScale(d.id) : $$.getYScale(d.id);
              return scale(d.value);
          };
      };
      c3_chart_internal_fn.getShapeOffset = function (typeFilter, indices, isSub) {
          var $$ = this,
              targets = $$.orderTargets($$.filterTargetsToShow($$.data.targets.filter(typeFilter, $$))),
              targetIds = targets.map(function (t) { return t.id; });
          return function (d, i) {
              var scale = isSub ? $$.getSubYScale(d.id) : $$.getYScale(d.id),
                  y0 = scale(0), offset = y0;
              targets.forEach(function (t) {
                  var values = $$.isStepType(d) ? $$.convertValuesToStep(t.values) : t.values;
                  if (t.id === d.id || indices[t.id] !== indices[d.id]) { return; }
                  if (targetIds.indexOf(t.id) < targetIds.indexOf(d.id)) {
                      if (values[i].value * d.value >= 0) {
                          offset += scale(values[i].value) - y0;
                      }
                  }
              });
              return offset;
          };
      };
      c3_chart_internal_fn.isWithinShape = function (that, d) {
          var $$ = this,
              shape = $$.d3.select(that), isWithin;
          if (!$$.isTargetToShow(d.id)) {
              isWithin = false;
          }
          else if (that.nodeName === 'circle') {
              isWithin = $$.isStepType(d) ? $$.isWithinStep(that, $$.getYScale(d.id)(d.value)) : $$.isWithinCircle(that, $$.pointSelectR(d) * 1.5);
          }
          else if (that.nodeName === 'path') {
              isWithin = shape.classed(CLASS.bar) ? $$.isWithinBar(that) : true;
          }
          return isWithin;
      };
  
  
      c3_chart_internal_fn.getInterpolate = function (d) {
          var $$ = this;
          return $$.isSplineType(d) ? "cardinal" : $$.isStepType(d) ? $$.config.line_step_type : "linear";
      };
  
      c3_chart_internal_fn.initLine = function () {
          var $$ = this;
          $$.main.select('.' + CLASS.chart).append("g")
              .attr("class", CLASS.chartLines);
      };
      c3_chart_internal_fn.updateTargetsForLine = function (targets) {
          var $$ = this, config = $$.config,
              mainLineUpdate, mainLineEnter,
              classChartLine = $$.classChartLine.bind($$),
              classLines = $$.classLines.bind($$),
              classAreas = $$.classAreas.bind($$),
              classCircles = $$.classCircles.bind($$),
              classFocus = $$.classFocus.bind($$);
          mainLineUpdate = $$.main.select('.' + CLASS.chartLines).selectAll('.' + CLASS.chartLine)
              .data(targets)
              .attr('class', function (d) { return classChartLine(d) + classFocus(d); });
          mainLineEnter = mainLineUpdate.enter().append('g')
              .attr('class', classChartLine)
              .style('opacity', 0)
              .style("pointer-events", "none");
          // Lines for each data
          mainLineEnter.append('g')
              .attr("class", classLines);
          // Areas
          mainLineEnter.append('g')
              .attr('class', classAreas);
          // Circles for each data point on lines
          mainLineEnter.append('g')
              .attr("class", function (d) { return $$.generateClass(CLASS.selectedCircles, d.id); });
          mainLineEnter.append('g')
              .attr("class", classCircles)
              .style("cursor", function (d) { return config.data_selection_isselectable(d) ? "pointer" : null; });
          // Update date for selected circles
          targets.forEach(function (t) {
              $$.main.selectAll('.' + CLASS.selectedCircles + $$.getTargetSelectorSuffix(t.id)).selectAll('.' + CLASS.selectedCircle).each(function (d) {
                  d.value = t.values[d.index].value;
              });
          });
          // MEMO: can not keep same color...
          //mainLineUpdate.exit().remove();
      };
      c3_chart_internal_fn.updateLine = function (durationForExit) {
          var $$ = this;
          $$.mainLine = $$.main.selectAll('.' + CLASS.lines).selectAll('.' + CLASS.line)
              .data($$.lineData.bind($$));
          $$.mainLine.enter().append('path')
              .attr('class', $$.classLine.bind($$))
              .style("stroke", $$.color);
          $$.mainLine
              .style("opacity", $$.initialOpacity.bind($$))
              .style('shape-rendering', function (d) { return $$.isStepType(d) ? 'crispEdges' : ''; })
              .attr('transform', null);
          $$.mainLine.exit().transition().duration(durationForExit)
              .style('opacity', 0)
              .remove();
      };
      c3_chart_internal_fn.redrawLine = function (drawLine, withTransition) {
          return [
              (withTransition ? this.mainLine.transition() : this.mainLine)
                  .attr("d", drawLine)
                  .style("stroke", this.color)
                  .style("opacity", 1)
          ];
      };
      c3_chart_internal_fn.generateDrawLine = function (lineIndices, isSub) {
          var $$ = this, config = $$.config,
              line = $$.d3.svg.line(),
              getPoints = $$.generateGetLinePoints(lineIndices, isSub),
              yScaleGetter = isSub ? $$.getSubYScale : $$.getYScale,
              xValue = function (d) { return (isSub ? $$.subxx : $$.xx).call($$, d); },
              yValue = function (d, i) {
                  return config.data_groups.length > 0 ? getPoints(d, i)[0][1] : yScaleGetter.call($$, d.id)(d.value);
              };
  
          line = config.axis_rotated ? line.x(yValue).y(xValue) : line.x(xValue).y(yValue);
          if (!config.line_connectNull) { line = line.defined(function (d) { return d.value != null; }); }
          return function (d) {
              var values = config.line_connectNull ? $$.filterRemoveNull(d.values) : d.values,
                  x = isSub ? $$.x : $$.subX, y = yScaleGetter.call($$, d.id), x0 = 0, y0 = 0, path;
              if ($$.isLineType(d)) {
                  if (config.data_regions[d.id]) {
                      path = $$.lineWithRegions(values, x, y, config.data_regions[d.id]);
                  } else {
                      if ($$.isStepType(d)) { values = $$.convertValuesToStep(values); }
                      path = line.interpolate($$.getInterpolate(d))(values);
                  }
              } else {
                  if (values[0]) {
                      x0 = x(values[0].x);
                      y0 = y(values[0].value);
                  }
                  path = config.axis_rotated ? "M " + y0 + " " + x0 : "M " + x0 + " " + y0;
              }
              return path ? path : "M 0 0";
          };
      };
      c3_chart_internal_fn.generateGetLinePoints = function (lineIndices, isSub) { // partial duplication of generateGetBarPoints
          var $$ = this, config = $$.config,
              lineTargetsNum = lineIndices.__max__ + 1,
              x = $$.getShapeX(0, lineTargetsNum, lineIndices, !!isSub),
              y = $$.getShapeY(!!isSub),
              lineOffset = $$.getShapeOffset($$.isLineType, lineIndices, !!isSub),
              yScale = isSub ? $$.getSubYScale : $$.getYScale;
          return function (d, i) {
              var y0 = yScale.call($$, d.id)(0),
                  offset = lineOffset(d, i) || y0, // offset is for stacked area chart
                  posX = x(d), posY = y(d);
              // fix posY not to overflow opposite quadrant
              if (config.axis_rotated) {
                  if ((0 < d.value && posY < y0) || (d.value < 0 && y0 < posY)) { posY = y0; }
              }
              // 1 point that marks the line position
              return [
                  [posX, posY - (y0 - offset)],
                  [posX, posY - (y0 - offset)], // needed for compatibility
                  [posX, posY - (y0 - offset)], // needed for compatibility
                  [posX, posY - (y0 - offset)]  // needed for compatibility
              ];
          };
      };
  
  
      c3_chart_internal_fn.lineWithRegions = function (d, x, y, _regions) {
          var $$ = this, config = $$.config,
              prev = -1, i, j,
              s = "M", sWithRegion,
              xp, yp, dx, dy, dd, diff, diffx2,
              xOffset = $$.isCategorized() ? 0.5 : 0,
              xValue, yValue,
              regions = [];
  
          function isWithinRegions(x, regions) {
              var i;
              for (i = 0; i < regions.length; i++) {
                  if (regions[i].start < x && x <= regions[i].end) { return true; }
              }
              return false;
          }
  
          // Check start/end of regions
          if (isDefined(_regions)) {
              for (i = 0; i < _regions.length; i++) {
                  regions[i] = {};
                  if (isUndefined(_regions[i].start)) {
                      regions[i].start = d[0].x;
                  } else {
                      regions[i].start = $$.isTimeSeries() ? $$.parseDate(_regions[i].start) : _regions[i].start;
                  }
                  if (isUndefined(_regions[i].end)) {
                      regions[i].end = d[d.length - 1].x;
                  } else {
                      regions[i].end = $$.isTimeSeries() ? $$.parseDate(_regions[i].end) : _regions[i].end;
                  }
              }
          }
  
          // Set scales
          xValue = config.axis_rotated ? function (d) { return y(d.value); } : function (d) { return x(d.x); };
          yValue = config.axis_rotated ? function (d) { return x(d.x); } : function (d) { return y(d.value); };
  
          // Define svg generator function for region
          function generateM(points) {
              return 'M' + points[0][0] + ' ' + points[0][1] + ' ' + points[1][0] + ' ' + points[1][1];
          }
          if ($$.isTimeSeries()) {
              sWithRegion = function (d0, d1, j, diff) {
                  var x0 = d0.x.getTime(), x_diff = d1.x - d0.x,
                      xv0 = new Date(x0 + x_diff * j),
                      xv1 = new Date(x0 + x_diff * (j + diff)),
                      points;
                  if (config.axis_rotated) {
                      points = [[y(yp(j)), x(xv0)], [y(yp(j + diff)), x(xv1)]];
                  } else {
                      points = [[x(xv0), y(yp(j))], [x(xv1), y(yp(j + diff))]];
                  }
                  return generateM(points);
              };
          } else {
              sWithRegion = function (d0, d1, j, diff) {
                  var points;
                  if (config.axis_rotated) {
                      points = [[y(yp(j), true), x(xp(j))], [y(yp(j + diff), true), x(xp(j + diff))]];
                  } else {
                      points = [[x(xp(j), true), y(yp(j))], [x(xp(j + diff), true), y(yp(j + diff))]];
                  }
                  return generateM(points);
              };
          }
  
          // Generate
          for (i = 0; i < d.length; i++) {
  
              // Draw as normal
              if (isUndefined(regions) || ! isWithinRegions(d[i].x, regions)) {
                  s += " " + xValue(d[i]) + " " + yValue(d[i]);
              }
              // Draw with region // TODO: Fix for horizotal charts
              else {
                  xp = $$.getScale(d[i - 1].x + xOffset, d[i].x + xOffset, $$.isTimeSeries());
                  yp = $$.getScale(d[i - 1].value, d[i].value);
  
                  dx = x(d[i].x) - x(d[i - 1].x);
                  dy = y(d[i].value) - y(d[i - 1].value);
                  dd = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));
                  diff = 2 / dd;
                  diffx2 = diff * 2;
  
                  for (j = diff; j <= 1; j += diffx2) {
                      s += sWithRegion(d[i - 1], d[i], j, diff);
                  }
              }
              prev = d[i].x;
          }
  
          return s;
      };
  
  
      c3_chart_internal_fn.updateArea = function (durationForExit) {
          var $$ = this, d3 = $$.d3;
          $$.mainArea = $$.main.selectAll('.' + CLASS.areas).selectAll('.' + CLASS.area)
              .data($$.lineData.bind($$));
          $$.mainArea.enter().append('path')
              .attr("class", $$.classArea.bind($$))
              .style("fill", $$.color)
              .style("opacity", function () { $$.orgAreaOpacity = +d3.select(this).style('opacity'); return 0; });
          $$.mainArea
              .style("opacity", $$.orgAreaOpacity);
          $$.mainArea.exit().transition().duration(durationForExit)
              .style('opacity', 0)
              .remove();
      };
      c3_chart_internal_fn.redrawArea = function (drawArea, withTransition) {
          return [
              (withTransition ? this.mainArea.transition() : this.mainArea)
                  .attr("d", drawArea)
                  .style("fill", this.color)
                  .style("opacity", this.orgAreaOpacity)
          ];
      };
      c3_chart_internal_fn.generateDrawArea = function (areaIndices, isSub) {
          var $$ = this, config = $$.config, area = $$.d3.svg.area(),
              getPoints = $$.generateGetAreaPoints(areaIndices, isSub),
              yScaleGetter = isSub ? $$.getSubYScale : $$.getYScale,
              xValue = function (d) { return (isSub ? $$.subxx : $$.xx).call($$, d); },
              value0 = function (d, i) {
                  return config.data_groups.length > 0 ? getPoints(d, i)[0][1] : yScaleGetter.call($$, d.id)($$.getAreaBaseValue(d.id));
              },
              value1 = function (d, i) {
                  return config.data_groups.length > 0 ? getPoints(d, i)[1][1] : yScaleGetter.call($$, d.id)(d.value);
              };
  
          area = config.axis_rotated ? area.x0(value0).x1(value1).y(xValue) : area.x(xValue).y0(value0).y1(value1);
          if (!config.line_connectNull) {
              area = area.defined(function (d) { return d.value !== null; });
          }
  
          return function (d) {
              var values = config.line_connectNull ? $$.filterRemoveNull(d.values) : d.values,
                  x0 = 0, y0 = 0, path;
              if ($$.isAreaType(d)) {
                  if ($$.isStepType(d)) { values = $$.convertValuesToStep(values); }
                  path = area.interpolate($$.getInterpolate(d))(values);
              } else {
                  if (values[0]) {
                      x0 = $$.x(values[0].x);
                      y0 = $$.getYScale(d.id)(values[0].value);
                  }
                  path = config.axis_rotated ? "M " + y0 + " " + x0 : "M " + x0 + " " + y0;
              }
              return path ? path : "M 0 0";
          };
      };
      c3_chart_internal_fn.getAreaBaseValue = function () {
          return 0;
      };
      c3_chart_internal_fn.generateGetAreaPoints = function (areaIndices, isSub) { // partial duplication of generateGetBarPoints
          var $$ = this, config = $$.config,
              areaTargetsNum = areaIndices.__max__ + 1,
              x = $$.getShapeX(0, areaTargetsNum, areaIndices, !!isSub),
              y = $$.getShapeY(!!isSub),
              areaOffset = $$.getShapeOffset($$.isAreaType, areaIndices, !!isSub),
              yScale = isSub ? $$.getSubYScale : $$.getYScale;
          return function (d, i) {
              var y0 = yScale.call($$, d.id)(0),
                  offset = areaOffset(d, i) || y0, // offset is for stacked area chart
                  posX = x(d), posY = y(d);
              // fix posY not to overflow opposite quadrant
              if (config.axis_rotated) {
                  if ((0 < d.value && posY < y0) || (d.value < 0 && y0 < posY)) { posY = y0; }
              }
              // 1 point that marks the area position
              return [
                  [posX, offset],
                  [posX, posY - (y0 - offset)],
                  [posX, posY - (y0 - offset)], // needed for compatibility
                  [posX, offset] // needed for compatibility
              ];
          };
      };
  
  
      c3_chart_internal_fn.updateCircle = function () {
          var $$ = this;
          $$.mainCircle = $$.main.selectAll('.' + CLASS.circles).selectAll('.' + CLASS.circle)
              .data($$.lineOrScatterData.bind($$));
          $$.mainCircle.enter().append("circle")
              .attr("class", $$.classCircle.bind($$))
              .attr("r", $$.pointR.bind($$))
              .style("fill", $$.color);
          $$.mainCircle
              .style("opacity", $$.initialOpacityForCircle.bind($$));
          $$.mainCircle.exit().remove();
      };
      c3_chart_internal_fn.redrawCircle = function (cx, cy, withTransition) {
          var selectedCircles = this.main.selectAll('.' + CLASS.selectedCircle);
          return [
              (withTransition ? this.mainCircle.transition() : this.mainCircle)
                  .style('opacity', this.opacityForCircle.bind(this))
                  .style("fill", this.color)
                  .attr("cx", cx)
                  .attr("cy", cy),
              (withTransition ? selectedCircles.transition() : selectedCircles)
                  .attr("cx", cx)
                  .attr("cy", cy)
          ];
      };
      c3_chart_internal_fn.circleX = function (d) {
          return d.x || d.x === 0 ? this.x(d.x) : null;
      };
      c3_chart_internal_fn.updateCircleY = function () {
          var $$ = this, lineIndices, getPoints;
          if ($$.config.data_groups.length > 0) {
              lineIndices = $$.getShapeIndices($$.isLineType),
              getPoints = $$.generateGetLinePoints(lineIndices);
              $$.circleY = function (d, i) {
                  return getPoints(d, i)[0][1];
              };
          } else {
              $$.circleY = function (d) {
                  return $$.getYScale(d.id)(d.value);
              };
          }
      };
      c3_chart_internal_fn.getCircles = function (i, id) {
          var $$ = this;
          return (id ? $$.main.selectAll('.' + CLASS.circles + $$.getTargetSelectorSuffix(id)) : $$.main).selectAll('.' + CLASS.circle + (isValue(i) ? '-' + i : ''));
      };
      c3_chart_internal_fn.expandCircles = function (i, id, reset) {
          var $$ = this,
              r = $$.pointExpandedR.bind($$);
          if (reset) { $$.unexpandCircles(); }
          $$.getCircles(i, id)
              .classed(CLASS.EXPANDED, true)
              .attr('r', r);
      };
      c3_chart_internal_fn.unexpandCircles = function (i) {
          var $$ = this,
              r = $$.pointR.bind($$);
          $$.getCircles(i)
              .filter(function () { return $$.d3.select(this).classed(CLASS.EXPANDED); })
              .classed(CLASS.EXPANDED, false)
              .attr('r', r);
      };
      c3_chart_internal_fn.pointR = function (d) {
          var $$ = this, config = $$.config;
          return $$.isStepType(d) ? 0 : (isFunction(config.point_r) ? config.point_r(d) : config.point_r);
      };
      c3_chart_internal_fn.pointExpandedR = function (d) {
          var $$ = this, config = $$.config;
          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;
      };
      c3_chart_internal_fn.isWithinCircle = function (that, r) {
          var d3 = this.d3,
              mouse = d3.mouse(that), d3_this = d3.select(that),
              cx = +d3_this.attr("cx"), cy = +d3_this.attr("cy");
          return Math.sqrt(Math.pow(cx - mouse[0], 2) + Math.pow(cy - mouse[1], 2)) < r;
      };
      c3_chart_internal_fn.isWithinStep = function (that, y) {
          return Math.abs(y - this.d3.mouse(that)[1]) < 30;
      };
  
      c3_chart_internal_fn.initBar = function () {
          var $$ = this;
          $$.main.select('.' + CLASS.chart).append("g")
              .attr("class", CLASS.chartBars);
      };
      c3_chart_internal_fn.updateTargetsForBar = function (targets) {
          var $$ = this, config = $$.config,
              mainBarUpdate, mainBarEnter,
              classChartBar = $$.classChartBar.bind($$),
              classBars = $$.classBars.bind($$),
              classFocus = $$.classFocus.bind($$);
          mainBarUpdate = $$.main.select('.' + CLASS.chartBars).selectAll('.' + CLASS.chartBar)
              .data(targets)
              .attr('class', function (d) { return classChartBar(d) + classFocus(d); });
          mainBarEnter = mainBarUpdate.enter().append('g')
              .attr('class', classChartBar)
              .style('opacity', 0)
              .style("pointer-events", "none");
          // Bars for each data
          mainBarEnter.append('g')
              .attr("class", classBars)
              .style("cursor", function (d) { return config.data_selection_isselectable(d) ? "pointer" : null; });
  
      };
      c3_chart_internal_fn.updateBar = function (durationForExit) {
          var $$ = this,
              barData = $$.barData.bind($$),
              classBar = $$.classBar.bind($$),
              initialOpacity = $$.initialOpacity.bind($$),
              color = function (d) { return $$.color(d.id); };
          $$.mainBar = $$.main.selectAll('.' + CLASS.bars).selectAll('.' + CLASS.bar)
              .data(barData);
          $$.mainBar.enter().append('path')
              .attr("class", classBar)
              .style("stroke", color)
              .style("fill", color);
          $$.mainBar
              .style("opacity", initialOpacity);
          $$.mainBar.exit().transition().duration(durationForExit)
              .style('opacity', 0)
              .remove();
      };
      c3_chart_internal_fn.redrawBar = function (drawBar, withTransition) {
          return [
              (withTransition ? this.mainBar.transition() : this.mainBar)
                  .attr('d', drawBar)
                  .style("fill", this.color)
                  .style("opacity", 1)
          ];
      };
      c3_chart_internal_fn.getBarW = function (axis, barTargetsNum) {
          var $$ = this, config = $$.config,
              w = typeof config.bar_width === 'number' ? config.bar_width : barTargetsNum ? (axis.tickInterval() * config.bar_width_ratio) / barTargetsNum : 0;
          return config.bar_width_max && w > config.bar_width_max ? config.bar_width_max : w;
      };
      c3_chart_internal_fn.getBars = function (i, id) {
          var $$ = this;
          return (id ? $$.main.selectAll('.' + CLASS.bars + $$.getTargetSelectorSuffix(id)) : $$.main).selectAll('.' + CLASS.bar + (isValue(i) ? '-' + i : ''));
      };
      c3_chart_internal_fn.expandBars = function (i, id, reset) {
          var $$ = this;
          if (reset) { $$.unexpandBars(); }
          $$.getBars(i, id).classed(CLASS.EXPANDED, true);
      };
      c3_chart_internal_fn.unexpandBars = function (i) {
          var $$ = this;
          $$.getBars(i).classed(CLASS.EXPANDED, false);
      };
      c3_chart_internal_fn.generateDrawBar = function (barIndices, isSub) {
          var $$ = this, config = $$.config,
              getPoints = $$.generateGetBarPoints(barIndices, isSub);
          return function (d, i) {
              // 4 points that make a bar
              var points = getPoints(d, i);
  
              // switch points if axis is rotated, not applicable for sub chart
              var indexX = config.axis_rotated ? 1 : 0;
              var indexY = config.axis_rotated ? 0 : 1;
  
              var path = 'M ' + points[0][indexX] + ',' + points[0][indexY] + ' ' +
                      'L' + points[1][indexX] + ',' + points[1][indexY] + ' ' +
                      'L' + points[2][indexX] + ',' + points[2][indexY] + ' ' +
                      'L' + points[3][indexX] + ',' + points[3][indexY] + ' ' +
                      'z';
  
              return path;
          };
      };
      c3_chart_internal_fn.generateGetBarPoints = function (barIndices, isSub) {
          var $$ = this,
              axis = isSub ? $$.subXAxis : $$.xAxis,
              barTargetsNum = barIndices.__max__ + 1,
              barW = $$.getBarW(axis, barTargetsNum),
              barX = $$.getShapeX(barW, barTargetsNum, barIndices, !!isSub),
              barY = $$.getShapeY(!!isSub),
              barOffset = $$.getShapeOffset($$.isBarType, barIndices, !!isSub),
              yScale = isSub ? $$.getSubYScale : $$.getYScale;
          return function (d, i) {
              var y0 = yScale.call($$, d.id)(0),
                  offset = barOffset(d, i) || y0, // offset is for stacked bar chart
                  posX = barX(d), posY = barY(d);
              // fix posY not to overflow opposite quadrant
              if ($$.config.axis_rotated) {
                  if ((0 < d.value && posY < y0) || (d.value < 0 && y0 < posY)) { posY = y0; }
              }
              // 4 points that make a bar
              return [
                  [posX, offset],
                  [posX, posY - (y0 - offset)],
                  [posX + barW, posY - (y0 - offset)],
                  [posX + barW, offset]
              ];
          };
      };
      c3_chart_internal_fn.isWithinBar = function (that) {
          var mouse = this.d3.mouse(that), box = that.getBoundingClientRect(),
              seg0 = that.pathSegList.getItem(0), seg1 = that.pathSegList.getItem(1),
              x = Math.min(seg0.x, seg1.x), y = Math.min(seg0.y, seg1.y),
              w = box.width, h = box.height, offset = 2,
              sx = x - offset, ex = x + w + offset, sy = y + h + offset, ey = y - offset;
          return sx < mouse[0] && mouse[0] < ex && ey < mouse[1] && mouse[1] < sy;
      };
  
      c3_chart_internal_fn.initText = function () {
          var $$ = this;
          $$.main.select('.' + CLASS.chart).append("g")
              .attr("class", CLASS.chartTexts);
          $$.mainText = $$.d3.selectAll([]);
      };
      c3_chart_internal_fn.updateTargetsForText = function (targets) {
          var $$ = this, mainTextUpdate, mainTextEnter,
              classChartText = $$.classChartText.bind($$),
              classTexts = $$.classTexts.bind($$),
              classFocus = $$.classFocus.bind($$);
          mainTextUpdate = $$.main.select('.' + CLASS.chartTexts).selectAll('.' + CLASS.chartText)
              .data(targets)
              .attr('class', function (d) { return classChartText(d) + classFocus(d); });
          mainTextEnter = mainTextUpdate.enter().append('g')
              .attr('class', classChartText)
              .style('opacity', 0)
              .style("pointer-events", "none");
          mainTextEnter.append('g')
              .attr('class', classTexts);
      };
      c3_chart_internal_fn.updateText = function (durationForExit) {
          var $$ = this, config = $$.config,
              barOrLineData = $$.barOrLineData.bind($$),
              classText = $$.classText.bind($$);
          $$.mainText = $$.main.selectAll('.' + CLASS.texts).selectAll('.' + CLASS.text)
              .data(barOrLineData);
          $$.mainText.enter().append('text')
              .attr("class", classText)
              .attr('text-anchor', function (d) { return config.axis_rotated ? (d.value < 0 ? 'end' : 'start') : 'middle'; })
              .style("stroke", 'none')
              .style("fill", function (d) { return $$.color(d); })
              .style("fill-opacity", 0);
          $$.mainText
              .text(function (d, i, j) { return $$.dataLabelFormat(d.id)(d.value, d.id, i, j); });
          $$.mainText.exit()
              .transition().duration(durationForExit)
              .style('fill-opacity', 0)
              .remove();
      };
      c3_chart_internal_fn.redrawText = function (xForText, yForText, forFlow, withTransition) {
          return [
              (withTransition ? this.mainText.transition() : this.mainText)
                  .attr('x', xForText)
                  .attr('y', yForText)
                  .style("fill", this.color)
                  .style("fill-opacity", forFlow ? 0 : this.opacityForText.bind(this))
          ];
      };
      c3_chart_internal_fn.getTextRect = function (text, cls) {
          var body = this.d3.select('body').classed('c3', true),
              svg = body.append("svg").style('visibility', 'hidden').style('position', 'fixed').style('top', 0).style('left', 0),
              rect;
          svg.selectAll('.dummy')
              .data([text])
            .enter().append('text')
              .classed(cls ? cls : "", true)
              .text(text)
            .each(function () { rect = this.getBoundingClientRect(); });
          svg.remove();
          body.classed('c3', false);
          return rect;
      };
      c3_chart_internal_fn.generateXYForText = function (areaIndices, barIndices, lineIndices, forX) {
          var $$ = this,
              getAreaPoints = $$.generateGetAreaPoints(areaIndices, false),
              getBarPoints = $$.generateGetBarPoints(barIndices, false),
              getLinePoints = $$.generateGetLinePoints(lineIndices, false),
              getter = forX ? $$.getXForText : $$.getYForText;
          return function (d, i) {
              var getPoints = $$.isAreaType(d) ? getAreaPoints : $$.isBarType(d) ? getBarPoints : getLinePoints;
              return getter.call($$, getPoints(d, i), d, this);
          };
      };
      c3_chart_internal_fn.getXForText = function (points, d, textElement) {
          var $$ = this,
              box = textElement.getBoundingClientRect(), xPos, padding;
          if ($$.config.axis_rotated) {
              padding = $$.isBarType(d) ? 4 : 6;
              xPos = points[2][1] + padding * (d.value < 0 ? -1 : 1);
          } else {
              xPos = $$.hasType('bar') ? (points[2][0] + points[0][0]) / 2 : points[0][0];
          }
          // show labels regardless of the domain if value is null
          if (d.value === null) {
              if (xPos > $$.width) {
                  xPos = $$.width - box.width;
              } else if (xPos < 0) {
                  xPos = 4;
              }
          }
          return xPos;
      };
      c3_chart_internal_fn.getYForText = function (points, d, textElement) {
          var $$ = this,
              box = textElement.getBoundingClientRect(), yPos;
          if ($$.config.axis_rotated) {
              yPos = (points[0][0] + points[2][0] + box.height * 0.6) / 2;
          } else {
              yPos = points[2][1] + (d.value < 0 ? box.height * 1.3 : $$.isBarType(d) ? -3 : -6);
          }
          // show labels regardless of the domain if value is null
          if (d.value === null && !$$.config.axis_rotated) {
              if (yPos < box.height) {
                  yPos = box.height;
              } else if (yPos > this.height) {
                  yPos = this.height - 4;
              }
          }
          return yPos;
      };
  
      c3_chart_internal_fn.setTargetType = function (targetIds, type) {
          var $$ = this, config = $$.config;
          $$.mapToTargetIds(targetIds).forEach(function (id) {
              $$.withoutFadeIn[id] = (type === config.data_types[id]);
              config.data_types[id] = type;
          });
          if (!targetIds) {
              config.data_type = type;
          }
      };
      c3_chart_internal_fn.hasType = function (type, targets) {
          var $$ = this, types = $$.config.data_types, has = false;
          targets = targets || $$.data.targets;
          if (targets && targets.length) {
              targets.forEach(function (target) {
                  var t = types[target.id];
                  if ((t && t.indexOf(type) >= 0) || (!t && type === 'line')) {
                      has = true;
                  }
              });
          } else if (Object.keys(types).length) {
              Object.keys(types).forEach(function (id) {
                  if (types[id] === type) { has = true; }
              });
          } else {
              has = $$.config.data_type === type;
          }
          return has;
      };
      c3_chart_internal_fn.hasArcType = function (targets) {
          return this.hasType('pie', targets) || this.hasType('donut', targets) || this.hasType('gauge', targets);
      };
      c3_chart_internal_fn.isLineType = function (d) {
          var config = this.config, id = isString(d) ? d : d.id;
          return !config.data_types[id] || ['line', 'spline', 'area', 'area-spline', 'step', 'area-step'].indexOf(config.data_types[id]) >= 0;
      };
      c3_chart_internal_fn.isStepType = function (d) {
          var id = isString(d) ? d : d.id;
          return ['step', 'area-step'].indexOf(this.config.data_types[id]) >= 0;
      };
      c3_chart_internal_fn.isSplineType = function (d) {
          var id = isString(d) ? d : d.id;
          return ['spline', 'area-spline'].indexOf(this.config.data_types[id]) >= 0;
      };
      c3_chart_internal_fn.isAreaType = function (d) {
          var id = isString(d) ? d : d.id;
          return ['area', 'area-spline', 'area-step'].indexOf(this.config.data_types[id]) >= 0;
      };
      c3_chart_internal_fn.isBarType = function (d) {
          var id = isString(d) ? d : d.id;
          return this.config.data_types[id] === 'bar';
      };
      c3_chart_internal_fn.isScatterType = function (d) {
          var id = isString(d) ? d : d.id;
          return this.config.data_types[id] === 'scatter';
      };
      c3_chart_internal_fn.isPieType = function (d) {
          var id = isString(d) ? d : d.id;
          return this.config.data_types[id] === 'pie';
      };
      c3_chart_internal_fn.isGaugeType = function (d) {
          var id = isString(d) ? d : d.id;
          return this.config.data_types[id] === 'gauge';
      };
      c3_chart_internal_fn.isDonutType = function (d) {
          var id = isString(d) ? d : d.id;
          return this.config.data_types[id] === 'donut';
      };
      c3_chart_internal_fn.isArcType = function (d) {
          return this.isPieType(d) || this.isDonutType(d) || this.isGaugeType(d);
      };
      c3_chart_internal_fn.lineData = function (d) {
          return this.isLineType(d) ? [d] : [];
      };
      c3_chart_internal_fn.arcData = function (d) {
          return this.isArcType(d.data) ? [d] : [];
      };
      /* not used
       function scatterData(d) {
       return isScatterType(d) ? d.values : [];
       }
       */
      c3_chart_internal_fn.barData = function (d) {
          return this.isBarType(d) ? d.values : [];
      };
      c3_chart_internal_fn.lineOrScatterData = function (d) {
          return this.isLineType(d) || this.isScatterType(d) ? d.values : [];
      };
      c3_chart_internal_fn.barOrLineData = function (d) {
          return this.isBarType(d) || this.isLineType(d) ? d.values : [];
      };
  
      c3_chart_internal_fn.initGrid = function () {
          var $$ = this, config = $$.config, d3 = $$.d3;
          $$.grid = $$.main.append('g')
              .attr("clip-path", $$.clipPathForGrid)
              .attr('class', CLASS.grid);
          if (config.grid_x_show) {
              $$.grid.append("g").attr("class", CLASS.xgrids);
          }
          if (config.grid_y_show) {
              $$.grid.append('g').attr('class', CLASS.ygrids);
          }
          if (config.grid_focus_show) {
              $$.grid.append('g')
                  .attr("class", CLASS.xgridFocus)
                  .append('line')
                  .attr('class', CLASS.xgridFocus);
          }
          $$.xgrid = d3.selectAll([]);
          if (!config.grid_lines_front) { $$.initGridLines(); }
      };
      c3_chart_internal_fn.initGridLines = function () {
          var $$ = this, d3 = $$.d3;
          $$.gridLines = $$.main.append('g')
              .attr("clip-path", $$.clipPathForGrid)
              .attr('class', CLASS.grid + ' ' + CLASS.gridLines);
          $$.gridLines.append('g').attr("class", CLASS.xgridLines);
          $$.gridLines.append('g').attr('class', CLASS.ygridLines);
          $$.xgridLines = d3.selectAll([]);
      };
      c3_chart_internal_fn.updateXGrid = function (withoutUpdate) {
          var $$ = this, config = $$.config, d3 = $$.d3,
              xgridData = $$.generateGridData(config.grid_x_type, $$.x),
              tickOffset = $$.isCategorized() ? $$.xAxis.tickOffset() : 0;
  
          $$.xgridAttr = config.axis_rotated ? {
              'x1': 0,
              'x2': $$.width,
              'y1': function (d) { return $$.x(d) - tickOffset; },
              'y2': function (d) { return $$.x(d) - tickOffset; }
          } : {
              'x1': function (d) { return $$.x(d) + tickOffset; },
              'x2': function (d) { return $$.x(d) + tickOffset; },
              'y1': 0,
              'y2': $$.height
          };
  
          $$.xgrid = $$.main.select('.' + CLASS.xgrids).selectAll('.' + CLASS.xgrid)
              .data(xgridData);
          $$.xgrid.enter().append('line').attr("class", CLASS.xgrid);
          if (!withoutUpdate) {
              $$.xgrid.attr($$.xgridAttr)
                  .style("opacity", function () { return +d3.select(this).attr(config.axis_rotated ? 'y1' : 'x1') === (config.axis_rotated ? $$.height : 0) ? 0 : 1; });
          }
          $$.xgrid.exit().remove();
      };
  
      c3_chart_internal_fn.updateYGrid = function () {
          var $$ = this, config = $$.config,
              gridValues = $$.yAxis.tickValues() || $$.y.ticks(config.grid_y_ticks);
          $$.ygrid = $$.main.select('.' + CLASS.ygrids).selectAll('.' + CLASS.ygrid)
              .data(gridValues);
          $$.ygrid.enter().append('line')
              .attr('class', CLASS.ygrid);
          $$.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);
          $$.ygrid.exit().remove();
          $$.smoothLines($$.ygrid, 'grid');
      };
  
      c3_chart_internal_fn.gridTextAnchor = function (d) {
          return d.position ? d.position : "end";
      };
      c3_chart_internal_fn.gridTextDx = function (d) {
          return d.position === 'start' ? 4 : d.position === 'middle' ? 0 : -4;
      };
      c3_chart_internal_fn.xGridTextX = function (d) {
          return d.position === 'start' ? -this.height : d.position === 'middle' ? -this.height / 2 : 0;
      };
      c3_chart_internal_fn.yGridTextX = function (d) {
          return d.position === 'start' ? 0 : d.position === 'middle' ? this.width / 2 : this.width;
      };
      c3_chart_internal_fn.updateGrid = function (duration) {
          var $$ = this, main = $$.main, config = $$.config,
              xgridLine, ygridLine, yv;
  
          // hide if arc type
          $$.grid.style('visibility', $$.hasArcType() ? 'hidden' : 'visible');
  
          main.select('line.' + CLASS.xgridFocus).style("visibility", "hidden");
          if (config.grid_x_show) {
              $$.updateXGrid();
          }
          $$.xgridLines = main.select('.' + CLASS.xgridLines).selectAll('.' + CLASS.xgridLine)
              .data(config.grid_x_lines);
          // enter
          xgridLine = $$.xgridLines.enter().append('g')
              .attr("class", function (d) { return CLASS.xgridLine + (d['class'] ? ' ' + d['class'] : ''); });
          xgridLine.append('line')
              .style("opacity", 0);
          xgridLine.append('text')
              .attr("text-anchor", $$.gridTextAnchor)
              .attr("transform", config.axis_rotated ? "" : "rotate(-90)")
              .attr('dx', $$.gridTextDx)
              .attr('dy', -5)
              .style("opacity", 0);
          // udpate
          // done in d3.transition() of the end of this function
          // exit
          $$.xgridLines.exit().transition().duration(duration)
              .style("opacity", 0)
              .remove();
  
          // Y-Grid
          if (config.grid_y_show) {
              $$.updateYGrid();
          }
          $$.ygridLines = main.select('.' + CLASS.ygridLines).selectAll('.' + CLASS.ygridLine)
              .data(config.grid_y_lines);
          // enter
          ygridLine = $$.ygridLines.enter().append('g')
              .attr("class", function (d) { return CLASS.ygridLine + (d['class'] ? ' ' + d['class'] : ''); });
          ygridLine.append('line')
              .style("opacity", 0);
          ygridLine.append('text')
              .attr("text-anchor", $$.gridTextAnchor)
              .attr("transform", config.axis_rotated ? "rotate(-90)" : "")
              .attr('dx', $$.gridTextDx)
              .attr('dy', -5)
              .style("opacity", 0);
          // update
          yv = $$.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)
              .style("opacity", 1);
          $$.ygridLines.select('text')
            .transition().duration(duration)
              .attr("x", config.axis_rotated ? $$.xGridTextX.bind($$) : $$.yGridTextX.bind($$))
              .attr("y", yv)
              .text(function (d) { return d.text; })
              .style("opacity", 1);
          // exit
          $$.ygridLines.exit().transition().duration(duration)
              .style("opacity", 0)
              .remove();
      };
      c3_chart_internal_fn.redrawGrid = function (withTransition) {
          var $$ = this, config = $$.config, xv = $$.xv.bind($$),
              lines = $$.xgridLines.select('line'),
              texts = $$.xgridLines.select('text');
          return [
              (withTransition ? lines.transition() : lines)
                  .attr("x1", config.axis_rotated ? 0 : xv)
                  .attr("x2", config.axis_rotated ? $$.width : xv)
                  .attr("y1", config.axis_rotated ? xv : 0)
                  .attr("y2", config.axis_rotated ? xv : $$.height)
                  .style("opacity", 1),
              (withTransition ? texts.transition() : texts)
                  .attr("x", config.axis_rotated ? $$.yGridTextX.bind($$) : $$.xGridTextX.bind($$))
                  .attr("y", xv)
                  .text(function (d) { return d.text; })
                  .style("opacity", 1)
          ];
      };
      c3_chart_internal_fn.showXGridFocus = function (selectedData) {
          var $$ = this, config = $$.config,
              dataToShow = selectedData.filter(function (d) { return d && isValue(d.value); }),
              focusEl = $$.main.selectAll('line.' + CLASS.xgridFocus),
              xx = $$.xx.bind($$);
          if (! config.tooltip_show) { return; }
          // Hide when scatter plot exists
          if ($$.hasType('scatter') || $$.hasArcType()) { return; }
          focusEl
              .style("visibility", "visible")
              .data([dataToShow[0]])
              .attr(config.axis_rotated ? 'y1' : 'x1', xx)
              .attr(config.axis_rotated ? 'y2' : 'x2', xx);
          $$.smoothLines(focusEl, 'grid');
      };
      c3_chart_internal_fn.hideXGridFocus = function () {
          this.main.select('line.' + CLASS.xgridFocus).style("visibility", "hidden");
      };
      c3_chart_internal_fn.updateXgridFocus = function () {
          var $$ = this, config = $$.config;
          $$.main.select('line.' + CLASS.xgridFocus)
              .attr("x1", config.axis_rotated ? 0 : -10)
              .attr("x2", config.axis_rotated ? $$.width : -10)
              .attr("y1", config.axis_rotated ? -10 : 0)
              .attr("y2", config.axis_rotated ? -10 : $$.height);
      };
      c3_chart_internal_fn.generateGridData = function (type, scale) {
          var $$ = this,
              gridData = [], xDomain, firstYear, lastYear, i,
              tickNum = $$.main.select("." + CLASS.axisX).selectAll('.tick').size();
          if (type === 'year') {
              xDomain = $$.getXDomain();
              firstYear = xDomain[0].getFullYear();
              lastYear = xDomain[1].getFullYear();
              for (i = firstYear; i <= lastYear; i++) {
                  gridData.push(new Date(i + '-01-01 00:00:00'));
              }
          } else {
              gridData = scale.ticks(10);
              if (gridData.length > tickNum) { // use only int
                  gridData = gridData.filter(function (d) { return ("" + d).indexOf('.') < 0; });
              }
          }
          return gridData;
      };
      c3_chart_internal_fn.getGridFilterToRemove = function (params) {
          return params ? function (line) {
              var found = false;
              [].concat(params).forEach(function (param) {
                  if ((('value' in param && line.value === param.value) || ('class' in param && line['class'] === param['class']))) {
                      found = true;
                  }
              });
              return found;
          } : function () { return true; };
      };
      c3_chart_internal_fn.removeGridLines = function (params, forX) {
          var $$ = this, config = $$.config,
              toRemove = $$.getGridFilterToRemove(params),
              toShow = function (line) { return !toRemove(line); },
              classLines = forX ? CLASS.xgridLines : CLASS.ygridLines,
              classLine = forX ? CLASS.xgridLine : CLASS.ygridLine;
          $$.main.select('.' + classLines).selectAll('.' + classLine).filter(toRemove)
              .transition().duration(config.transition_duration)
              .style('opacity', 0).remove();
          if (forX) {
              config.grid_x_lines = config.grid_x_lines.filter(toShow);
          } else {
              config.grid_y_lines = config.grid_y_lines.filter(toShow);
          }
      };
  
      c3_chart_internal_fn.initTooltip = function () {
          var $$ = this, config = $$.config, i;
          $$.tooltip = $$.selectChart
              .style("position", "relative")
            .append("div")
              .attr('class', CLASS.tooltipContainer)
              .style("position", "absolute")
              .style("pointer-events", "none")
              .style("display", "none");
          // Show tooltip if needed
          if (config.tooltip_init_show) {
              if ($$.isTimeSeries() && isString(config.tooltip_init_x)) {
                  config.tooltip_init_x = $$.parseDate(config.tooltip_init_x);
                  for (i = 0; i < $$.data.targets[0].values.length; i++) {
                      if (($$.data.targets[0].values[i].x - config.tooltip_init_x) === 0) { break; }
                  }
                  config.tooltip_init_x = i;
              }
              $$.tooltip.html(config.tooltip_contents.call($$, $$.data.targets.map(function (d) {
                  return $$.addName(d.values[config.tooltip_init_x]);
              }), $$.axis.getXAxisTickFormat(), $$.getYFormat($$.hasArcType()), $$.color));
              $$.tooltip.style("top", config.tooltip_init_position.top)
                  .style("left", config.tooltip_init_position.left)
                  .style("display", "block");
          }
      };
      c3_chart_internal_fn.getTooltipContent = function (d, defaultTitleFormat, defaultValueFormat, color) {
          var $$ = this, config = $$.config,
              titleFormat = config.tooltip_format_title || defaultTitleFormat,
              nameFormat = config.tooltip_format_name || function (name) { return name; },
              valueFormat = config.tooltip_format_value || defaultValueFormat,
              text, i, title, value, name, bgcolor;
          for (i = 0; i < d.length; i++) {
              if (! (d[i] && (d[i].value || d[i].value === 0))) { continue; }
  
              if (! text) {
                  title = titleFormat ? titleFormat(d[i].x) : d[i].x;
                  text = "<table class='" + CLASS.tooltip + "'>" + (title || title === 0 ? "<tr><th colspan='2'>" + title + "</th></tr>" : "");
              }
  
              value = valueFormat(d[i].value, d[i].ratio, d[i].id, d[i].index);
              if (value !== undefined) {
                  name = nameFormat(d[i].name, d[i].ratio, d[i].id, d[i].index);
                  bgcolor = $$.levelColor ? $$.levelColor(d[i].value) : color(d[i].id);
  
                  text += "<tr class='" + CLASS.tooltipName + "-" + d[i].id + "'>";
                  text += "<td class='name'><span style='background-color:" + bgcolor + "'></span>" + name + "</td>";
                  text += "<td class='value'>" + value + "</td>";
                  text += "</tr>";
              }
          }
          return text + "</table>";
      };
      c3_chart_internal_fn.tooltipPosition = function (dataToShow, tWidth, tHeight, element) {
          var $$ = this, config = $$.config, d3 = $$.d3;
          var svgLeft, tooltipLeft, tooltipRight, tooltipTop, chartRight;
          var forArc = $$.hasArcType(),
              mouse = d3.mouse(element);
        // Determin tooltip position
          if (forArc) {
              tooltipLeft = (($$.width - ($$.isLegendRight ? $$.getLegendWidth() : 0)) / 2) + mouse[0];
              tooltipTop = ($$.height / 2) + mouse[1] + 20;
          } else {
              svgLeft = $$.getSvgLeft(true);
              if (config.axis_rotated) {
                  tooltipLeft = svgLeft + mouse[0] + 100;
                  tooltipRight = tooltipLeft + tWidth;
                  chartRight = $$.currentWidth - $$.getCurrentPaddingRight();
                  tooltipTop = $$.x(dataToShow[0].x) + 20;
              } else {
                  tooltipLeft = svgLeft + $$.getCurrentPaddingLeft(true) + $$.x(dataToShow[0].x) + 20;
                  tooltipRight = tooltipLeft + tWidth;
                  chartRight = svgLeft + $$.currentWidth - $$.getCurrentPaddingRight();
                  tooltipTop = mouse[1] + 15;
              }
  
              if (tooltipRight > chartRight) {
                  // 20 is needed for Firefox to keep tooletip width
                  tooltipLeft -= tooltipRight - chartRight + 20;
              }
              if (tooltipTop + tHeight > $$.currentHeight) {
                  tooltipTop -= tHeight + 30;
              }
          }
          if (tooltipTop < 0) {
              tooltipTop = 0;
          }
          return {top: tooltipTop, left: tooltipLeft};
      };
      c3_chart_internal_fn.showTooltip = function (selectedData, element) {
          var $$ = this, config = $$.config;
          var tWidth, tHeight, position;
          var forArc = $$.hasArcType(),
              dataToShow = selectedData.filter(function (d) { return d && isValue(d.value); }),
              positionFunction = config.tooltip_position || c3_chart_internal_fn.tooltipPosition;
          if (dataToShow.length === 0 || !config.tooltip_show) {
              return;
          }
          $$.tooltip.html(config.tooltip_contents.call($$, selectedData, $$.axis.getXAxisTickFormat(), $$.getYFormat(forArc), $$.color)).style("display", "block");
  
          // Get tooltip dimensions
          tWidth = $$.tooltip.property('offsetWidth');
          tHeight = $$.tooltip.property('offsetHeight');
  
          position = positionFunction.call(this, dataToShow, tWidth, tHeight, element);
          // Set tooltip
          $$.tooltip
              .style("top", position.top + "px")
              .style("left", position.left + 'px');
      };
      c3_chart_internal_fn.hideTooltip = function () {
          this.tooltip.style("display", "none");
      };
  
      c3_chart_internal_fn.initLegend = function () {
          var $$ = this;
          $$.legendHasRendered = false;
          $$.legend = $$.svg.append("g").attr("transform", $$.getTranslate('legend'));
          if (!$$.config.legend_show) {
              $$.legend.style('visibility', 'hidden');
              $$.hiddenLegendIds = $$.mapToIds($$.data.targets);
              return;
          }
          // MEMO: call here to update legend box and tranlate for all
          // MEMO: translate will be upated by this, so transform not needed in updateLegend()
          $$.updateLegendWithDefaults();
      };
      c3_chart_internal_fn.updateLegendWithDefaults = function () {
          var $$ = this;
          $$.updateLegend($$.mapToIds($$.data.targets), {withTransform: false, withTransitionForTransform: false, withTransition: false});
      };
      c3_chart_internal_fn.updateSizeForLegend = function (legendHeight, legendWidth) {
          var $$ = this, config = $$.config, insetLegendPosition = {
              top: $$.isLegendTop ? $$.getCurrentPaddingTop() + config.legend_inset_y + 5.5 : $$.currentHeight - legendHeight - $$.getCurrentPaddingBottom() - config.legend_inset_y,
              left: $$.isLegendLeft ? $$.getCurrentPaddingLeft() + config.legend_inset_x + 0.5 : $$.currentWidth - legendWidth - $$.getCurrentPaddingRight() - config.legend_inset_x + 0.5
          };
  
          $$.margin3 = {
              top: $$.isLegendRight ? 0 : $$.isLegendInset ? insetLegendPosition.top : $$.currentHeight - legendHeight,
              right: NaN,
              bottom: 0,
              left: $$.isLegendRight ? $$.currentWidth - legendWidth : $$.isLegendInset ? insetLegendPosition.left : 0
          };
      };
      c3_chart_internal_fn.transformLegend = function (withTransition) {
          var $$ = this;
          (withTransition ? $$.legend.transition() : $$.legend).attr("transform", $$.getTranslate('legend'));
      };
      c3_chart_internal_fn.updateLegendStep = function (step) {
          this.legendStep = step;
      };
      c3_chart_internal_fn.updateLegendItemWidth = function (w) {
          this.legendItemWidth = w;
      };
      c3_chart_internal_fn.updateLegendItemHeight = function (h) {
          this.legendItemHeight = h;
      };
      c3_chart_internal_fn.getLegendWidth = function () {
          var $$ = this;
          return $$.config.legend_show ? $$.isLegendRight || $$.isLegendInset ? $$.legendItemWidth * ($$.legendStep + 1) : $$.currentWidth : 0;
      };
      c3_chart_internal_fn.getLegendHeight = function () {
          var $$ = this, h = 0;
          if ($$.config.legend_show) {
              if ($$.isLegendRight) {
                  h = $$.currentHeight;
              } else {
                  h = Math.max(20, $$.legendItemHeight) * ($$.legendStep + 1);
              }
          }
          return h;
      };
      c3_chart_internal_fn.opacityForLegend = function (legendItem) {
          return legendItem.classed(CLASS.legendItemHidden) ? null : 1;
      };
      c3_chart_internal_fn.opacityForUnfocusedLegend = function (legendItem) {
          return legendItem.classed(CLASS.legendItemHidden) ? null : 0.3;
      };
      c3_chart_internal_fn.toggleFocusLegend = function (targetIds, focus) {
          var $$ = this;
          targetIds = $$.mapToTargetIds(targetIds);
          $$.legend.selectAll('.' + CLASS.legendItem)
              .filter(function (id) { return targetIds.indexOf(id) >= 0; })
              .classed(CLASS.legendItemFocused, focus)
            .transition().duration(100)
              .style('opacity', function () {
                  var opacity = focus ? $$.opacityForLegend : $$.opacityForUnfocusedLegend;
                  return opacity.call($$, $$.d3.select(this));
              });
      };
      c3_chart_internal_fn.revertLegend = function () {
          var $$ = this, d3 = $$.d3;
          $$.legend.selectAll('.' + CLASS.legendItem)
              .classed(CLASS.legendItemFocused, false)
              .transition().duration(100)
              .style('opacity', function () { return $$.opacityForLegend(d3.select(this)); });
      };
      c3_chart_internal_fn.showLegend = function (targetIds) {
          var $$ = this, config = $$.config;
          if (!config.legend_show) {
              config.legend_show = true;
              $$.legend.style('visibility', 'visible');
              if (!$$.legendHasRendered) {
                  $$.updateLegendWithDefaults();
              }
          }
          $$.removeHiddenLegendIds(targetIds);
          $$.legend.selectAll($$.selectorLegends(targetIds))
              .style('visibility', 'visible')
              .transition()
              .style('opacity', function () { return $$.opacityForLegend($$.d3.select(this)); });
      };
      c3_chart_internal_fn.hideLegend = function (targetIds) {
          var $$ = this, config = $$.config;
          if (config.legend_show && isEmpty(targetIds)) {
              config.legend_show = false;
              $$.legend.style('visibility', 'hidden');
          }
          $$.addHiddenLegendIds(targetIds);
          $$.legend.selectAll($$.selectorLegends(targetIds))
              .style('opacity', 0)
              .style('visibility', 'hidden');
      };
      var legendItemTextBox = {};
      c3_chart_internal_fn.clearLegendItemTextBoxCache = function () {
          legendItemTextBox = {};
      };
      c3_chart_internal_fn.updateLegend = function (targetIds, options, transitions) {
          var $$ = this, config = $$.config;
          var xForLegend, xForLegendText, xForLegendRect, yForLegend, yForLegendText, yForLegendRect;
          var paddingTop = 4, paddingRight = 10, maxWidth = 0, maxHeight = 0, posMin = 10, tileWidth = 15;
          var l, totalLength = 0, offsets = {}, widths = {}, heights = {}, margins = [0], steps = {}, step = 0;
          var withTransition, withTransitionForTransform;
          var texts, rects, tiles, background;
  
          options = options || {};
          withTransition = getOption(options, "withTransition", true);
          withTransitionForTransform = getOption(options, "withTransitionForTransform", true);
  
          function getTextBox(textElement, id) {
              if (!legendItemTextBox[id]) {
                  legendItemTextBox[id] = $$.getTextRect(textElement.textContent, CLASS.legendItem);
              }
              return legendItemTextBox[id];
          }
  
          function updatePositions(textElement, id, index) {
              var reset = index === 0, isLast = index === targetIds.length - 1,
                  box = getTextBox(textElement, id),
                  itemWidth = box.width + tileWidth + (isLast && !($$.isLegendRight || $$.isLegendInset) ? 0 : paddingRight),
                  itemHeight = box.height + paddingTop,
                  itemLength = $$.isLegendRight || $$.isLegendInset ? itemHeight : itemWidth,
                  areaLength = $$.isLegendRight || $$.isLegendInset ? $$.getLegendHeight() : $$.getLegendWidth(),
                  margin, maxLength;
  
              // MEMO: care about condifion of step, totalLength
              function updateValues(id, withoutStep) {
                  if (!withoutStep) {
                      margin = (areaLength - totalLength - itemLength) / 2;
                      if (margin < posMin) {
                          margin = (areaLength - itemLength) / 2;
                          totalLength = 0;
                          step++;
                      }
                  }
                  steps[id] = step;
                  margins[step] = $$.isLegendInset ? 10 : margin;
                  offsets[id] = totalLength;
                  totalLength += itemLength;
              }
  
              if (reset) {
                  totalLength = 0;
                  step = 0;
                  maxWidth = 0;
                  maxHeight = 0;
              }
  
              if (config.legend_show && !$$.isLegendToShow(id)) {
                  widths[id] = heights[id] = steps[id] = offsets[id] = 0;
                  return;
              }
  
              widths[id] = itemWidth;
              heights[id] = itemHeight;
  
              if (!maxWidth || itemWidth >= maxWidth) { maxWidth = itemWidth; }
              if (!maxHeight || itemHeight >= maxHeight) { maxHeight = itemHeight; }
              maxLength = $$.isLegendRight || $$.isLegendInset ? maxHeight : maxWidth;
  
              if (config.legend_equally) {
                  Object.keys(widths).forEach(function (id) { widths[id] = maxWidth; });
                  Object.keys(heights).forEach(function (id) { heights[id] = maxHeight; });
                  margin = (areaLength - maxLength * targetIds.length) / 2;
                  if (margin < posMin) {
                      totalLength = 0;
                      step = 0;
                      targetIds.forEach(function (id) { updateValues(id); });
                  }
                  else {
                      updateValues(id, true);
                  }
              } else {
                  updateValues(id);
              }
          }
  
          if ($$.isLegendInset) {
              step = config.legend_inset_step ? config.legend_inset_step : targetIds.length;
              $$.updateLegendStep(step);
          }
  
          if ($$.isLegendRight) {
              xForLegend = function (id) { return maxWidth * steps[id]; };
              yForLegend = function (id) { return margins[steps[id]] + offsets[id]; };
          } else if ($$.isLegendInset) {
              xForLegend = function (id) { return maxWidth * steps[id] + 10; };
              yForLegend = function (id) { return margins[steps[id]] + offsets[id]; };
          } else {
              xForLegend = function (id) { return margins[steps[id]] + offsets[id]; };
              yForLegend = function (id) { return maxHeight * steps[id]; };
          }
          xForLegendText = function (id, i) { return xForLegend(id, i) + 14; };
          yForLegendText = function (id, i) { return yForLegend(id, i) + 9; };
          xForLegendRect = function (id, i) { return xForLegend(id, i); };
          yForLegendRect = function (id, i) { return yForLegend(id, i) - 5; };
  
          // Define g for legend area
          l = $$.legend.selectAll('.' + CLASS.legendItem)
              .data(targetIds)
              .enter().append('g')
              .attr('class', function (id) { return $$.generateClass(CLASS.legendItem, id); })
              .style('visibility', function (id) { return $$.isLegendToShow(id) ? 'visible' : 'hidden'; })
              .style('cursor', 'pointer')
              .on('click', function (id) {
                  if (config.legend_item_onclick) {
                      config.legend_item_onclick.call($$, id);
                  } else {
                      if ($$.d3.event.altKey) {
                          $$.api.hide();
                          $$.api.show(id);
                      } else {
                          $$.api.toggle(id);
                          $$.isTargetToShow(id) ? $$.api.focus(id) : $$.api.revert();
                      }
                  }
              })
              .on('mouseover', function (id) {
                  $$.d3.select(this).classed(CLASS.legendItemFocused, true);
                  if (!$$.transiting && $$.isTargetToShow(id)) {
                      $$.api.focus(id);
                  }
                  if (config.legend_item_onmouseover) {
                      config.legend_item_onmouseover.call($$, id);
                  }
              })
              .on('mouseout', function (id) {
                  $$.d3.select(this).classed(CLASS.legendItemFocused, false);
                  $$.api.revert();
                  if (config.legend_item_onmouseout) {
                      config.legend_item_onmouseout.call($$, id);
                  }
              });
          l.append('text')
              .text(function (id) { return isDefined(config.data_names[id]) ? config.data_names[id] : id; })
              .each(function (id, i) { updatePositions(this, id, i); })
              .style("pointer-events", "none")
              .attr('x', $$.isLegendRight || $$.isLegendInset ? xForLegendText : -200)
              .attr('y', $$.isLegendRight || $$.isLegendInset ? -200 : yForLegendText);
          l.append('rect')
              .attr("class", CLASS.legendItemEvent)
              .style('fill-opacity', 0)
              .attr('x', $$.isLegendRight || $$.isLegendInset ? xForLegendRect : -200)
              .attr('y', $$.isLegendRight || $$.isLegendInset ? -200 : yForLegendRect);
          l.append('rect')
              .attr("class", CLASS.legendItemTile)
              .style("pointer-events", "none")
              .style('fill', $$.color)
              .attr('x', $$.isLegendRight || $$.isLegendInset ? xForLegendText : -200)
              .attr('y', $$.isLegendRight || $$.isLegendInset ? -200 : yForLegend)
              .attr('width', 10)
              .attr('height', 10);
  
          // Set background for inset legend
          background = $$.legend.select('.' + CLASS.legendBackground + ' rect');
          if ($$.isLegendInset && maxWidth > 0 && background.size() === 0) {
              background = $$.legend.insert('g', '.' + CLASS.legendItem)
                  .attr("class", CLASS.legendBackground)
                  .append('rect');
          }
  
          texts = $$.legend.selectAll('text')
              .data(targetIds)
              .text(function (id) { return isDefined(config.data_names[id]) ? config.data_names[id] : id; }) // MEMO: needed for update
              .each(function (id, i) { updatePositions(this, id, i); });
          (withTransition ? texts.transition() : texts)
              .attr('x', xForLegendText)
              .attr('y', yForLegendText);
  
          rects = $$.legend.selectAll('rect.' + CLASS.legendItemEvent)
              .data(targetIds);
          (withTransition ? rects.transition() : rects)
              .attr('width', function (id) { return widths[id]; })
              .attr('height', function (id) { return heights[id]; })
              .attr('x', xForLegendRect)
              .attr('y', yForLegendRect);
  
          tiles = $$.legend.selectAll('rect.' + CLASS.legendItemTile)
              .data(targetIds);
          (withTransition ? tiles.transition() : tiles)
              .style('fill', $$.color)
              .attr('x', xForLegend)
              .attr('y', yForLegend);
  
          if (background) {
              (withTransition ? background.transition() : background)
                  .attr('height', $$.getLegendHeight() - 12)
                  .attr('width', maxWidth * (step + 1) + 10);
          }
  
          // toggle legend state
          $$.legend.selectAll('.' + CLASS.legendItem)
              .classed(CLASS.legendItemHidden, function (id) { return !$$.isTargetToShow(id); });
  
          // Update all to reflect change of legend
          $$.updateLegendItemWidth(maxWidth);
          $$.updateLegendItemHeight(maxHeight);
          $$.updateLegendStep(step);
          // Update size and scale
          $$.updateSizes();
          $$.updateScales();
          $$.updateSvgSize();
          // Update g positions
          $$.transformAll(withTransitionForTransform, transitions);
          $$.legendHasRendered = true;
      };
  
      function Axis(owner) {
          API.call(this, owner);
      }
  
      inherit(API, Axis);
  
      Axis.prototype.init = function init() {
  
          var $$ = this.owner, config = $$.config, main = $$.main;
          $$.axes.x = main.append("g")
              .attr("class", CLASS.axis + ' ' + CLASS.axisX)
              .attr("clip-path", $$.clipPathForXAxis)
              .attr("transform", $$.getTranslate('x'))
              .style("visibility", config.axis_x_show ? 'visible' : 'hidden');
          $$.axes.x.append("text")
              .attr("class", CLASS.axisXLabel)
              .attr("transform", config.axis_rotated ? "rotate(-90)" : "")
              .style("text-anchor", this.textAnchorForXAxisLabel.bind(this));
          $$.axes.y = main.append("g")
              .attr("class", CLASS.axis + ' ' + CLASS.axisY)
              .attr("clip-path", config.axis_y_inner ? "" : $$.clipPathForYAxis)
              .attr("transform", $$.getTranslate('y'))
              .style("visibility", config.axis_y_show ? 'visible' : 'hidden');
          $$.axes.y.append("text")
              .attr("class", CLASS.axisYLabel)
              .attr("transform", config.axis_rotated ? "" : "rotate(-90)")
              .style("text-anchor", this.textAnchorForYAxisLabel.bind(this));
  
          $$.axes.y2 = main.append("g")
              .attr("class", CLASS.axis + ' ' + CLASS.axisY2)
              // clip-path?
              .attr("transform", $$.getTranslate('y2'))
              .style("visibility", config.axis_y2_show ? 'visible' : 'hidden');
          $$.axes.y2.append("text")
              .attr("class", CLASS.axisY2Label)
              .attr("transform", config.axis_rotated ? "" : "rotate(-90)")
              .style("text-anchor", this.textAnchorForY2AxisLabel.bind(this));
      };
      Axis.prototype.getXAxis = function getXAxis(scale, orient, tickFormat, tickValues, withOuterTick, withoutTransition) {
          var $$ = this.owner, config = $$.config,
              axisParams = {
                  isCategory: $$.isCategorized(),
                  withOuterTick: withOuterTick,
                  tickMultiline: config.axis_x_tick_multiline,
                  tickWidth: config.axis_x_tick_width,
                  withoutTransition: withoutTransition,
              },
              axis = c3_axis($$.d3, axisParams).scale(scale).orient(orient);
  
          if ($$.isTimeSeries() && tickValues) {
              tickValues = tickValues.map(function (v) { return $$.parseDate(v); });
          }
  
          // Set tick
          axis.tickFormat(tickFormat).tickValues(tickValues);
          if ($$.isCategorized()) {
              axis.tickCentered(config.axis_x_tick_centered);
              if (isEmpty(config.axis_x_tick_culling)) {
                  config.axis_x_tick_culling = false;
              }
          }
  
          return axis;
      };
      Axis.prototype.updateXAxisTickValues = function updateXAxisTickValues(targets, axis) {
          var $$ = this.owner, config = $$.config, tickValues;
          if (config.axis_x_tick_fit || config.axis_x_tick_count) {
              tickValues = this.generateTickValues($$.mapTargetsToUniqueXs(targets), config.axis_x_tick_count, $$.isTimeSeries());
          }
          if (axis) {
              axis.tickValues(tickValues);
          } else {
              $$.xAxis.tickValues(tickValues);
              $$.subXAxis.tickValues(tickValues);
          }
          return tickValues;
      };
      Axis.prototype.getYAxis = function getYAxis(scale, orient, tickFormat, tickValues, withOuterTick) {
          var axisParams = {withOuterTick: withOuterTick},
              $$ = this.owner,
              d3 = $$.d3,
              config = $$.config,
              axis = c3_axis(d3, axisParams).scale(scale).orient(orient).tickFormat(tickFormat);
          if ($$.isTimeSeriesY()) {
              axis.ticks(d3.time[config.axis_y_tick_time_value], config.axis_y_tick_time_interval);
          } else {
              axis.tickValues(tickValues);
          }
          return axis;
      };
      Axis.prototype.getId = function getId(id) {
          var config = this.owner.config;
          return id in config.data_axes ? config.data_axes[id] : 'y';
      };
      Axis.prototype.getXAxisTickFormat = function getXAxisTickFormat() {
          var $$ = this.owner, config = $$.config,
              format = $$.isTimeSeries() ? $$.defaultAxisTimeFormat : $$.isCategorized() ? $$.categoryName : function (v) { return v < 0 ? v.toFixed(0) : v; };
          if (config.axis_x_tick_format) {
              if (isFunction(config.axis_x_tick_format)) {
                  format = config.axis_x_tick_format;
              } else if ($$.isTimeSeries()) {
                  format = function (date) {
                      return date ? $$.axisTimeFormat(config.axis_x_tick_format)(date) : "";
                  };
              }
          }
          return isFunction(format) ? function (v) { return format.call($$, v); } : format;
      };
      Axis.prototype.getTickValues = function getTickValues(tickValues, axis) {
          return tickValues ? tickValues : axis ? axis.tickValues() : undefined;
      };
      Axis.prototype.getXAxisTickValues = function getXAxisTickValues() {
          return this.getTickValues(this.owner.config.axis_x_tick_values, this.owner.xAxis);
      };
      Axis.prototype.getYAxisTickValues = function getYAxisTickValues() {
          return this.getTickValues(this.owner.config.axis_y_tick_values, this.owner.yAxis);
      };
      Axis.prototype.getY2AxisTickValues = function getY2AxisTickValues() {
          return this.getTickValues(this.owner.config.axis_y2_tick_values, this.owner.y2Axis);
      };
      Axis.prototype.getLabelOptionByAxisId = function getLabelOptionByAxisId(axisId) {
          var $$ = this.owner, config = $$.config, option;
          if (axisId === 'y') {
              option = config.axis_y_label;
          } else if (axisId === 'y2') {
              option = config.axis_y2_label;
          } else if (axisId === 'x') {
              option = config.axis_x_label;
          }
          return option;
      };
      Axis.prototype.getLabelText = function getLabelText(axisId) {
          var option = this.getLabelOptionByAxisId(axisId);
          return isString(option) ? option : option ? option.text : null;
      };
      Axis.prototype.setLabelText = function setLabelText(axisId, text) {
          var $$ = this.owner, config = $$.config,
              option = this.getLabelOptionByAxisId(axisId);
          if (isString(option)) {
              if (axisId === 'y') {
                  config.axis_y_label = text;
              } else if (axisId === 'y2') {
                  config.axis_y2_label = text;
              } else if (axisId === 'x') {
                  config.axis_x_label = text;
              }
          } else if (option) {
              option.text = text;
          }
      };
      Axis.prototype.getLabelPosition = function getLabelPosition(axisId, defaultPosition) {
          var option = this.getLabelOptionByAxisId(axisId),
              position = (option && typeof option === 'object' && option.position) ? option.position : defaultPosition;
          return {
              isInner: position.indexOf('inner') >= 0,
              isOuter: position.indexOf('outer') >= 0,
              isLeft: position.indexOf('left') >= 0,
              isCenter: position.indexOf('center') >= 0,
              isRight: position.indexOf('right') >= 0,
              isTop: position.indexOf('top') >= 0,
              isMiddle: position.indexOf('middle') >= 0,
              isBottom: position.indexOf('bottom') >= 0
          };
      };
      Axis.prototype.getXAxisLabelPosition = function getXAxisLabelPosition() {
          return this.getLabelPosition('x', this.owner.config.axis_rotated ? 'inner-top' : 'inner-right');
      };
      Axis.prototype.getYAxisLabelPosition = function getYAxisLabelPosition() {
          return this.getLabelPosition('y', this.owner.config.axis_rotated ? 'inner-right' : 'inner-top');
      };
      Axis.prototype.getY2AxisLabelPosition = function getY2AxisLabelPosition() {
          return this.getLabelPosition('y2', this.owner.config.axis_rotated ? 'inner-right' : 'inner-top');
      };
      Axis.prototype.getLabelPositionById = function getLabelPositionById(id) {
          return id === 'y2' ? this.getY2AxisLabelPosition() : id === 'y' ? this.getYAxisLabelPosition() : this.getXAxisLabelPosition();
      };
      Axis.prototype.textForXAxisLabel = function textForXAxisLabel() {
          return this.getLabelText('x');
      };
      Axis.prototype.textForYAxisLabel = function textForYAxisLabel() {
          return this.getLabelText('y');
      };
      Axis.prototype.textForY2AxisLabel = function textForY2AxisLabel() {
          return this.getLabelText('y2');
      };
      Axis.prototype.xForAxisLabel = function xForAxisLabel(forHorizontal, position) {
          var $$ = this.owner;
          if (forHorizontal) {
              return position.isLeft ? 0 : position.isCenter ? $$.width / 2 : $$.width;
          } else {
              return position.isBottom ? -$$.height : position.isMiddle ? -$$.height / 2 : 0;
          }
      };
      Axis.prototype.dxForAxisLabel = function dxForAxisLabel(forHorizontal, position) {
          if (forHorizontal) {
              return position.isLeft ? "0.5em" : position.isRight ? "-0.5em" : "0";
          } else {
              return position.isTop ? "-0.5em" : position.isBottom ? "0.5em" : "0";
          }
      };
      Axis.prototype.textAnchorForAxisLabel = function textAnchorForAxisLabel(forHorizontal, position) {
          if (forHorizontal) {
              return position.isLeft ? 'start' : position.isCenter ? 'middle' : 'end';
          } else {
              return position.isBottom ? 'start' : position.isMiddle ? 'middle' : 'end';
          }
      };
      Axis.prototype.xForXAxisLabel = function xForXAxisLabel() {
          return this.xForAxisLabel(!this.owner.config.axis_rotated, this.getXAxisLabelPosition());
      };
      Axis.prototype.xForYAxisLabel = function xForYAxisLabel() {
          return this.xForAxisLabel(this.owner.config.axis_rotated, this.getYAxisLabelPosition());
      };
      Axis.prototype.xForY2AxisLabel = function xForY2AxisLabel() {
          return this.xForAxisLabel(this.owner.config.axis_rotated, this.getY2AxisLabelPosition());
      };
      Axis.prototype.dxForXAxisLabel = function dxForXAxisLabel() {
          return this.dxForAxisLabel(!this.owner.config.axis_rotated, this.getXAxisLabelPosition());
      };
      Axis.prototype.dxForYAxisLabel = function dxForYAxisLabel() {
          return this.dxForAxisLabel(this.owner.config.axis_rotated, this.getYAxisLabelPosition());
      };
      Axis.prototype.dxForY2AxisLabel = function dxForY2AxisLabel() {
          return this.dxForAxisLabel(this.owner.config.axis_rotated, this.getY2AxisLabelPosition());
      };
      Axis.prototype.dyForXAxisLabel = function dyForXAxisLabel() {
          var $$ = this.owner, config = $$.config,
              position = this.getXAxisLabelPosition();
          if (config.axis_rotated) {
              return position.isInner ? "1.2em" : -25 - this.getMaxTickWidth('x');
          } else {
              return position.isInner ? "-0.5em" : config.axis_x_height ? config.axis_x_height - 10 : "3em";
          }
      };
      Axis.prototype.dyForYAxisLabel = function dyForYAxisLabel() {
          var $$ = this.owner,
              position = this.getYAxisLabelPosition();
          if ($$.config.axis_rotated) {
              return position.isInner ? "-0.5em" : "3em";
          } else {
              return position.isInner ? "1.2em" : -10 - ($$.config.axis_y_inner ? 0 : (this.getMaxTickWidth('y') + 10));
          }
      };
      Axis.prototype.dyForY2AxisLabel = function dyForY2AxisLabel() {
          var $$ = this.owner,
              position = this.getY2AxisLabelPosition();
          if ($$.config.axis_rotated) {
              return position.isInner ? "1.2em" : "-2.2em";
          } else {
              return position.isInner ? "-0.5em" : 15 + ($$.config.axis_y2_inner ? 0 : (this.getMaxTickWidth('y2') + 15));
          }
      };
      Axis.prototype.textAnchorForXAxisLabel = function textAnchorForXAxisLabel() {
          var $$ = this.owner;
          return this.textAnchorForAxisLabel(!$$.config.axis_rotated, this.getXAxisLabelPosition());
      };
      Axis.prototype.textAnchorForYAxisLabel = function textAnchorForYAxisLabel() {
          var $$ = this.owner;
          return this.textAnchorForAxisLabel($$.config.axis_rotated, this.getYAxisLabelPosition());
      };
      Axis.prototype.textAnchorForY2AxisLabel = function textAnchorForY2AxisLabel() {
          var $$ = this.owner;
          return this.textAnchorForAxisLabel($$.config.axis_rotated, this.getY2AxisLabelPosition());
      };
      Axis.prototype.xForRotatedTickText = function xForRotatedTickText(r) {
          return 8 * Math.sin(Math.PI * (r / 180));
      };
      Axis.prototype.yForRotatedTickText = function yForRotatedTickText(r) {
          return 11.5 - 2.5 * (r / 15) * (r > 0 ? 1 : -1);
      };
      Axis.prototype.rotateTickText = function rotateTickText(axis, transition, rotate) {
          axis.selectAll('.tick text')
              .style("text-anchor", rotate > 0 ? "start" : "end");
          transition.selectAll('.tick text')
              .attr("y", this.yForRotatedTickText(rotate))
              .attr("transform", "rotate(" + rotate + ")")
            .selectAll('tspan')
              .attr('dx', this.xForRotatedTickText(rotate));
      };
      Axis.prototype.getMaxTickWidth = function getMaxTickWidth(id, withoutRecompute) {
          var $$ = this.owner, config = $$.config,
              maxWidth = 0, targetsToShow, scale, axis, body, svg;
          if (withoutRecompute && $$.currentMaxTickWidths[id]) {
              return $$.currentMaxTickWidths[id];
          }
          if ($$.svg) {
              targetsToShow = $$.filterTargetsToShow($$.data.targets);
              if (id === 'y') {
                  scale = $$.y.copy().domain($$.getYDomain(targetsToShow, 'y'));
                  axis = this.getYAxis(scale, $$.yOrient, config.axis_y_tick_format, $$.yAxisTickValues);
              } else if (id === 'y2') {
                  scale = $$.y2.copy().domain($$.getYDomain(targetsToShow, 'y2'));
                  axis = this.getYAxis(scale, $$.y2Orient, config.axis_y2_tick_format, $$.y2AxisTickValues);
              } else {
                  scale = $$.x.copy().domain($$.getXDomain(targetsToShow));
                  axis = this.getXAxis(scale, $$.xOrient, $$.xAxisTickFormat, $$.xAxisTickValues);
                  this.updateXAxisTickValues(targetsToShow, axis);
              }
              body = $$.d3.select('body').classed('c3', true);
              svg = body.append("svg").style('visibility', 'hidden').style('position', 'fixed').style('top', 0).style('left', 0),
              svg.append('g').call(axis).each(function () {
                  $$.d3.select(this).selectAll('text tspan').each(function () {
                      var box = this.getBoundingClientRect();
                      if (maxWidth < box.width) { maxWidth = box.width; }
                  });
              });
              // TODO: time lag to get maxWidth
              window.setTimeout(function () {
                  svg.remove();
              }, 100);
              body.classed('c3', false);
          }
          $$.currentMaxTickWidths[id] = maxWidth <= 0 ? $$.currentMaxTickWidths[id] : maxWidth;
          return $$.currentMaxTickWidths[id];
      };
  
      Axis.prototype.updateLabels = function updateLabels(withTransition) {
          var $$ = this.owner;
          var axisXLabel = $$.main.select('.' + CLASS.axisX + ' .' + CLASS.axisXLabel),
              axisYLabel = $$.main.select('.' + CLASS.axisY + ' .' + CLASS.axisYLabel),
              axisY2Label = $$.main.select('.' + CLASS.axisY2 + ' .' + CLASS.axisY2Label);
          (withTransition ? axisXLabel.transition() : axisXLabel)
              .attr("x", this.xForXAxisLabel.bind(this))
              .attr("dx", this.dxForXAxisLabel.bind(this))
              .attr("dy", this.dyForXAxisLabel.bind(this))
              .text(this.textForXAxisLabel.bind(this));
          (withTransition ? axisYLabel.transition() : axisYLabel)
              .attr("x", this.xForYAxisLabel.bind(this))
              .attr("dx", this.dxForYAxisLabel.bind(this))
              .attr("dy", this.dyForYAxisLabel.bind(this))
              .text(this.textForYAxisLabel.bind(this));
          (withTransition ? axisY2Label.transition() : axisY2Label)
              .attr("x", this.xForY2AxisLabel.bind(this))
              .attr("dx", this.dxForY2AxisLabel.bind(this))
              .attr("dy", this.dyForY2AxisLabel.bind(this))
              .text(this.textForY2AxisLabel.bind(this));
      };
      Axis.prototype.getPadding = function getPadding(padding, key, defaultValue, domainLength) {
          if (!isValue(padding[key])) {
              return defaultValue;
          }
          if (padding.unit === 'ratio') {
              return padding[key] * domainLength;
          }
          // assume padding is pixels if unit is not specified
          return this.convertPixelsToAxisPadding(padding[key], domainLength);
      };
      Axis.prototype.convertPixelsToAxisPadding = function convertPixelsToAxisPadding(pixels, domainLength) {
          var $$ = this.owner,
              length = $$.config.axis_rotated ? $$.width : $$.height;
          return domainLength * (pixels / length);
      };
      Axis.prototype.generateTickValues = function generateTickValues(values, tickCount, forTimeSeries) {
          var tickValues = values, targetCount, start, end, count, interval, i, tickValue;
          if (tickCount) {
              targetCount = isFunction(tickCount) ? tickCount() : tickCount;
              // compute ticks according to tickCount
              if (targetCount === 1) {
                  tickValues = [values[0]];
              } else if (targetCount === 2) {
                  tickValues = [values[0], values[values.length - 1]];
              } else if (targetCount > 2) {
                  count = targetCount - 2;
                  start = values[0];
                  end = values[values.length - 1];
                  interval = (end - start) / (count + 1);
                  // re-construct unique values
                  tickValues = [start];
                  for (i = 0; i < count; i++) {
                      tickValue = +start + interval * (i + 1);
                      tickValues.push(forTimeSeries ? new Date(tickValue) : tickValue);
                  }
                  tickValues.push(end);
              }
          }
          if (!forTimeSeries) { tickValues = tickValues.sort(function (a, b) { return a - b; }); }
          return tickValues;
      };
      Axis.prototype.generateTransitions = function generateTransitions(duration) {
          var $$ = this.owner, axes = $$.axes;
          return {
              axisX: duration ? axes.x.transition().duration(duration) : axes.x,
              axisY: duration ? axes.y.transition().duration(duration) : axes.y,
              axisY2: duration ? axes.y2.transition().duration(duration) : axes.y2,
              axisSubX: duration ? axes.subx.transition().duration(duration) : axes.subx
          };
      };
      Axis.prototype.redraw = function redraw(transitions, isHidden) {
          var $$ = this.owner, config = $$.config;
          $$.axes.x.style("opacity", isHidden ? 0 : 1);
          $$.axes.y.style("opacity", isHidden ? 0 : 1);
          $$.axes.y2.style("opacity", isHidden ? 0 : 1);
          $$.axes.subx.style("opacity", isHidden ? 0 : 1);
          transitions.axisX.call($$.xAxis);
          transitions.axisY.call($$.yAxis);
          transitions.axisY2.call($$.y2Axis);
          transitions.axisSubX.call($$.subXAxis);
          // rotate tick text if needed
          if (!config.axis_rotated && config.axis_x_tick_rotate) {
              this.rotateTickText($$.axes.x, transitions.axisX, config.axis_x_tick_rotate);
              this.rotateTickText($$.axes.subx, transitions.axisSubX, config.axis_x_tick_rotate);
          }
      };
  
      c3_chart_internal_fn.getClipPath = function (id) {
          var isIE9 = window.navigator.appVersion.toLowerCase().indexOf("msie 9.") >= 0;
          return "url(" + (isIE9 ? "" : document.URL.split('#')[0]) + "#" + id + ")";
      };
      c3_chart_internal_fn.appendClip = function (parent, id) {
          return parent.append("clipPath").attr("id", id).append("rect");
      };
      c3_chart_internal_fn.getAxisClipX = function (forHorizontal) {
          // axis line width + padding for left
          var left = Math.max(30, this.margin.left);
          return forHorizontal ? -(1 + left) : -(left - 1);
      };
      c3_chart_internal_fn.getAxisClipY = function (forHorizontal) {
          return forHorizontal ? -20 : -this.margin.top;
      };
      c3_chart_internal_fn.getXAxisClipX = function () {
          var $$ = this;
          return $$.getAxisClipX(!$$.config.axis_rotated);
      };
      c3_chart_internal_fn.getXAxisClipY = function () {
          var $$ = this;
          return $$.getAxisClipY(!$$.config.axis_rotated);
      };
      c3_chart_internal_fn.getYAxisClipX = function () {
          var $$ = this;
          return $$.config.axis_y_inner ? -1 : $$.getAxisClipX($$.config.axis_rotated);
      };
      c3_chart_internal_fn.getYAxisClipY = function () {
          var $$ = this;
          return $$.getAxisClipY($$.config.axis_rotated);
      };
      c3_chart_internal_fn.getAxisClipWidth = function (forHorizontal) {
          var $$ = this,
              left = Math.max(30, $$.margin.left),
              right = Math.max(30, $$.margin.right);
          // width + axis line width + padding for left/right
          return forHorizontal ? $$.width + 2 + left + right : $$.margin.left + 20;
      };
      c3_chart_internal_fn.getAxisClipHeight = function (forHorizontal) {
          // less than 20 is not enough to show the axis label 'outer' without legend
          return (forHorizontal ? this.margin.bottom : (this.margin.top + this.height)) + 20;
      };
      c3_chart_internal_fn.getXAxisClipWidth = function () {
          var $$ = this;
          return $$.getAxisClipWidth(!$$.config.axis_rotated);
      };
      c3_chart_internal_fn.getXAxisClipHeight = function () {
          var $$ = this;
          return $$.getAxisClipHeight(!$$.config.axis_rotated);
      };
      c3_chart_internal_fn.getYAxisClipWidth = function () {
          var $$ = this;
          return $$.getAxisClipWidth($$.config.axis_rotated) + ($$.config.axis_y_inner ? 20 : 0);
      };
      c3_chart_internal_fn.getYAxisClipHeight = function () {
          var $$ = this;
          return $$.getAxisClipHeight($$.config.axis_rotated);
      };
  
      c3_chart_internal_fn.initPie = function () {
          var $$ = this, d3 = $$.d3, config = $$.config;
          $$.pie = d3.layout.pie().value(function (d) {
              return d.values.reduce(function (a, b) { return a + b.value; }, 0);
          });
          if (!config.data_order) {
              $$.pie.sort(null);
          }
      };
  
      c3_chart_internal_fn.updateRadius = function () {
          var $$ = this, config = $$.config,
              w = config.gauge_width || config.donut_width;
          $$.radiusExpanded = Math.min($$.arcWidth, $$.arcHeight) / 2;
          $$.radius = $$.radiusExpanded * 0.95;
          $$.innerRadiusRatio = w ? ($$.radius - w) / $$.radius : 0.6;
          $$.innerRadius = $$.hasType('donut') || $$.hasType('gauge') ? $$.radius * $$.innerRadiusRatio : 0;
      };
  
      c3_chart_internal_fn.updateArc = function () {
          var $$ = this;
          $$.svgArc = $$.getSvgArc();
          $$.svgArcExpanded = $$.getSvgArcExpanded();
          $$.svgArcExpandedSub = $$.getSvgArcExpanded(0.98);
      };
  
      c3_chart_internal_fn.updateAngle = function (d) {
          var $$ = this, config = $$.config,
              found = false, index = 0,
              gMin = config.gauge_min, gMax = config.gauge_max, gTic, gValue;
          $$.pie($$.filterTargetsToShow($$.data.targets)).forEach(function (t) {
              if (! found && t.data.id === d.data.id) {
                  found = true;
                  d = t;
                  d.index = index;
              }
              index++;
          });
          if (isNaN(d.startAngle)) {
              d.startAngle = 0;
          }
          if (isNaN(d.endAngle)) {
              d.endAngle = d.startAngle;
          }
          if ($$.isGaugeType(d.data)) {
              gTic = (Math.PI) / (gMax - gMin);
              gValue = d.value < gMin ? 0 : d.value < gMax ? d.value - gMin : (gMax - gMin);
              d.startAngle = -1 * (Math.PI / 2);
              d.endAngle = d.startAngle + gTic * gValue;
          }
          return found ? d : null;
      };
  
      c3_chart_internal_fn.getSvgArc = function () {
          var $$ = this,
              arc = $$.d3.svg.arc().outerRadius($$.radius).innerRadius($$.innerRadius),
              newArc = function (d, withoutUpdate) {
                  var updated;
                  if (withoutUpdate) { return arc(d); } // for interpolate
                  updated = $$.updateAngle(d);
                  return updated ? arc(updated) : "M 0 0";
              };
          // TODO: extends all function
          newArc.centroid = arc.centroid;
          return newArc;
      };
  
      c3_chart_internal_fn.getSvgArcExpanded = function (rate) {
          var $$ = this,
              arc = $$.d3.svg.arc().outerRadius($$.radiusExpanded * (rate ? rate : 1)).innerRadius($$.innerRadius);
          return function (d) {
              var updated = $$.updateAngle(d);
              return updated ? arc(updated) : "M 0 0";
          };
      };
  
      c3_chart_internal_fn.getArc = function (d, withoutUpdate, force) {
          return force || this.isArcType(d.data) ? this.svgArc(d, withoutUpdate) : "M 0 0";
      };
  
  
      c3_chart_internal_fn.transformForArcLabel = function (d) {
          var $$ = this,
              updated = $$.updateAngle(d), c, x, y, h, ratio, translate = "";
          if (updated && !$$.hasType('gauge')) {
              c = this.svgArc.centroid(updated);
              x = isNaN(c[0]) ? 0 : c[0];
              y = isNaN(c[1]) ? 0 : c[1];
              h = Math.sqrt(x * x + y * y);
              // TODO: ratio should be an option?
              ratio = $$.radius && h ? (36 / $$.radius > 0.375 ? 1.175 - 36 / $$.radius : 0.8) * $$.radius / h : 0;
              translate = "translate(" + (x * ratio) +  ',' + (y * ratio) +  ")";
          }
          return translate;
      };
  
      c3_chart_internal_fn.getArcRatio = function (d) {
          var $$ = this,
              whole = $$.hasType('gauge') ? Math.PI : (Math.PI * 2);
          return d ? (d.endAngle - d.startAngle) / whole : null;
      };
  
      c3_chart_internal_fn.convertToArcData = function (d) {
          return this.addName({
              id: d.data.id,
              value: d.value,
              ratio: this.getArcRatio(d),
              index: d.index
          });
      };
  
      c3_chart_internal_fn.textForArcLabel = function (d) {
          var $$ = this,
              updated, value, ratio, id, format;
          if (! $$.shouldShowArcLabel()) { return ""; }
          updated = $$.updateAngle(d);
          value = updated ? updated.value : null;
          ratio = $$.getArcRatio(updated);
          id = d.data.id;
          if (! $$.hasType('gauge') && ! $$.meetsArcLabelThreshold(ratio)) { return ""; }
          format = $$.getArcLabelFormat();
          return format ? format(value, ratio, id) : $$.defaultArcValueFormat(value, ratio);
      };
  
      c3_chart_internal_fn.expandArc = function (targetIds) {
          var $$ = this, interval;
  
          // MEMO: avoid to cancel transition
          if ($$.transiting) {
              interval = window.setInterval(function () {
                  if (!$$.transiting) {
                      window.clearInterval(interval);
                      if ($$.legend.selectAll('.c3-legend-item-focused').size() > 0) {
                          $$.expandArc(targetIds);
                      }
                  }
              }, 10);
              return;
          }
  
          targetIds = $$.mapToTargetIds(targetIds);
  
          $$.svg.selectAll($$.selectorTargets(targetIds, '.' + CLASS.chartArc)).each(function (d) {
              if (! $$.shouldExpand(d.data.id)) { return; }
              $$.d3.select(this).selectAll('path')
                  .transition().duration(50)
                  .attr("d", $$.svgArcExpanded)
                  .transition().duration(100)
                  .attr("d", $$.svgArcExpandedSub)
                  .each(function (d) {
                      if ($$.isDonutType(d.data)) {
                          // callback here
                      }
                  });
          });
      };
  
      c3_chart_internal_fn.unexpandArc = function (targetIds) {
          var $$ = this;
  
          if ($$.transiting) { return; }
  
          targetIds = $$.mapToTargetIds(targetIds);
  
          $$.svg.selectAll($$.selectorTargets(targetIds, '.' + CLASS.chartArc)).selectAll('path')
              .transition().duration(50)
              .attr("d", $$.svgArc);
          $$.svg.selectAll('.' + CLASS.arc)
              .style("opacity", 1);
      };
  
      c3_chart_internal_fn.shouldExpand = function (id) {
          var $$ = this, config = $$.config;
          return ($$.isDonutType(id) && config.donut_expand) || ($$.isGaugeType(id) && config.gauge_expand) || ($$.isPieType(id) && config.pie_expand);
      };
  
      c3_chart_internal_fn.shouldShowArcLabel = function () {
          var $$ = this, config = $$.config, shouldShow = true;
          if ($$.hasType('donut')) {
              shouldShow = config.donut_label_show;
          } else if ($$.hasType('pie')) {
              shouldShow = config.pie_label_show;
          }
          // when gauge, always true
          return shouldShow;
      };
  
      c3_chart_internal_fn.meetsArcLabelThreshold = function (ratio) {
          var $$ = this, config = $$.config,
              threshold = $$.hasType('donut') ? config.donut_label_threshold : config.pie_label_threshold;
          return ratio >= threshold;
      };
  
      c3_chart_internal_fn.getArcLabelFormat = function () {
          var $$ = this, config = $$.config,
              format = config.pie_label_format;
          if ($$.hasType('gauge')) {
              format = config.gauge_label_format;
          } else if ($$.hasType('donut')) {
              format = config.donut_label_format;
          }
          return format;
      };
  
      c3_chart_internal_fn.getArcTitle = function () {
          var $$ = this;
          return $$.hasType('donut') ? $$.config.donut_title : "";
      };
  
      c3_chart_internal_fn.updateTargetsForArc = function (targets) {
          var $$ = this, main = $$.main,
              mainPieUpdate, mainPieEnter,
              classChartArc = $$.classChartArc.bind($$),
              classArcs = $$.classArcs.bind($$),
              classFocus = $$.classFocus.bind($$);
          mainPieUpdate = main.select('.' + CLASS.chartArcs).selectAll('.' + CLASS.chartArc)
              .data($$.pie(targets))
              .attr("class", function (d) { return classChartArc(d) + classFocus(d.data); });
          mainPieEnter = mainPieUpdate.enter().append("g")
              .attr("class", classChartArc);
          mainPieEnter.append('g')
              .attr('class', classArcs);
          mainPieEnter.append("text")
              .attr("dy", $$.hasType('gauge') ? "-.1em" : ".35em")
              .style("opacity", 0)
              .style("text-anchor", "middle")
              .style("pointer-events", "none");
          // MEMO: can not keep same color..., but not bad to update color in redraw
          //mainPieUpdate.exit().remove();
      };
  
      c3_chart_internal_fn.initArc = function () {
          var $$ = this;
          $$.arcs = $$.main.select('.' + CLASS.chart).append("g")
              .attr("class", CLASS.chartArcs)
              .attr("transform", $$.getTranslate('arc'));
          $$.arcs.append('text')
              .attr('class', CLASS.chartArcsTitle)
              .style("text-anchor", "middle")
              .text($$.getArcTitle());
      };
  
      c3_chart_internal_fn.redrawArc = function (duration, durationForExit, withTransform) {
          var $$ = this, d3 = $$.d3, config = $$.config, main = $$.main,
              mainArc;
          mainArc = main.selectAll('.' + CLASS.arcs).selectAll('.' + CLASS.arc)
              .data($$.arcData.bind($$));
          mainArc.enter().append('path')
              .attr("class", $$.classArc.bind($$))
              .style("fill", function (d) { return $$.color(d.data); })
              .style("cursor", function (d) { return config.interaction_enabled && config.data_selection_isselectable(d) ? "pointer" : null; })
              .style("opacity", 0)
              .each(function (d) {
                  if ($$.isGaugeType(d.data)) {
                      d.startAngle = d.endAngle = -1 * (Math.PI / 2);
                  }
                  this._current = d;
              });
          mainArc
              .attr("transform", function (d) { return !$$.isGaugeType(d.data) && withTransform ? "scale(0)" : ""; })
              .style("opacity", function (d) { return d === this._current ? 0 : 1; })
              .on('mouseover', config.interaction_enabled ? function (d) {
                  var updated, arcData;
                  if ($$.transiting) { // skip while transiting
                      return;
                  }
                  updated = $$.updateAngle(d);
                  arcData = $$.convertToArcData(updated);
                  // transitions
                  $$.expandArc(updated.data.id);
                  $$.api.focus(updated.data.id);
                  $$.toggleFocusLegend(updated.data.id, true);
                  $$.config.data_onmouseover(arcData, this);
              } : null)
              .on('mousemove', config.interaction_enabled ? function (d) {
                  var updated = $$.updateAngle(d),
                      arcData = $$.convertToArcData(updated),
                      selectedData = [arcData];
                  $$.showTooltip(selectedData, this);
              } : null)
              .on('mouseout', config.interaction_enabled ? function (d) {
                  var updated, arcData;
                  if ($$.transiting) { // skip while transiting
                      return;
                  }
                  updated = $$.updateAngle(d);
                  arcData = $$.convertToArcData(updated);
                  // transitions
                  $$.unexpandArc(updated.data.id);
                  $$.api.revert();
                  $$.revertLegend();
                  $$.hideTooltip();
                  $$.config.data_onmouseout(arcData, this);
              } : null)
              .on('click', config.interaction_enabled ? function (d, i) {
                  var updated = $$.updateAngle(d),
                      arcData = $$.convertToArcData(updated);
                  if ($$.toggleShape) { $$.toggleShape(this, arcData, i); }
                  $$.config.data_onclick.call($$.api, arcData, this);
              } : null)
              .each(function () { $$.transiting = true; })
              .transition().duration(duration)
              .attrTween("d", function (d) {
                  var updated = $$.updateAngle(d), interpolate;
                  if (! updated) {
                      return function () { return "M 0 0"; };
                  }
                  //                if (this._current === d) {
                  //                    this._current = {
                  //                        startAngle: Math.PI*2,
                  //                        endAngle: Math.PI*2,
                  //                    };
                  //                }
                  if (isNaN(this._current.startAngle)) {
                      this._current.startAngle = 0;
                  }
                  if (isNaN(this._current.endAngle)) {
                      this._current.endAngle = this._current.startAngle;
                  }
                  interpolate = d3.interpolate(this._current, updated);
                  this._current = interpolate(0);
                  return function (t) {
                      var interpolated = interpolate(t);
                      interpolated.data = d.data; // data.id will be updated by interporator
                      return $$.getArc(interpolated, true);
                  };
              })
              .attr("transform", withTransform ? "scale(1)" : "")
              .style("fill", function (d) {
                  return $$.levelColor ? $$.levelColor(d.data.values[0].value) : $$.color(d.data.id);
              }) // Where gauge reading color would receive customization.
              .style("opacity", 1)
              .call($$.endall, function () {
                  $$.transiting = false;
              });
          mainArc.exit().transition().duration(durationForExit)
              .style('opacity', 0)
              .remove();
          main.selectAll('.' + CLASS.chartArc).select('text')
              .style("opacity", 0)
              .attr('class', function (d) { return $$.isGaugeType(d.data) ? CLASS.gaugeValue : ''; })
              .text($$.textForArcLabel.bind($$))
              .attr("transform", $$.transformForArcLabel.bind($$))
              .style('font-size', function (d) { return $$.isGaugeType(d.data) ? Math.round($$.radius / 5) + 'px' : ''; })
            .transition().duration(duration)
              .style("opacity", function (d) { return $$.isTargetToShow(d.data.id) && $$.isArcType(d.data) ? 1 : 0; });
          main.select('.' + CLASS.chartArcsTitle)
              .style("opacity", $$.hasType('donut') || $$.hasType('gauge') ? 1 : 0);
  
          if ($$.hasType('gauge')) {
              $$.arcs.select('.' + CLASS.chartArcsBackground)
                  .attr("d", function () {
                      var d = {
                          data: [{value: config.gauge_max}],
                          startAngle: -1 * (Math.PI / 2),
                          endAngle: Math.PI / 2
                      };
                      return $$.getArc(d, true, true);
                  });
              $$.arcs.select('.' + CLASS.chartArcsGaugeUnit)
                  .attr("dy", ".75em")
                  .text(config.gauge_label_show ? config.gauge_units : '');
              $$.arcs.select('.' + CLASS.chartArcsGaugeMin)
                  .attr("dx", -1 * ($$.innerRadius + (($$.radius - $$.innerRadius) / 2)) + "px")
                  .attr("dy", "1.2em")
                  .text(config.gauge_label_show ? config.gauge_min : '');
              $$.arcs.select('.' + CLASS.chartArcsGaugeMax)
                  .attr("dx", $$.innerRadius + (($$.radius - $$.innerRadius) / 2) + "px")
                  .attr("dy", "1.2em")
                  .text(config.gauge_label_show ? config.gauge_max : '');
          }
      };
      c3_chart_internal_fn.initGauge = function () {
          var arcs = this.arcs;
          if (this.hasType('gauge')) {
              arcs.append('path')
                  .attr("class", CLASS.chartArcsBackground);
              arcs.append("text")
                  .attr("class", CLASS.chartArcsGaugeUnit)
                  .style("text-anchor", "middle")
                  .style("pointer-events", "none");
              arcs.append("text")
                  .attr("class", CLASS.chartArcsGaugeMin)
                  .style("text-anchor", "middle")
                  .style("pointer-events", "none");
              arcs.append("text")
                  .attr("class", CLASS.chartArcsGaugeMax)
                  .style("text-anchor", "middle")
                  .style("pointer-events", "none");
          }
      };
      c3_chart_internal_fn.getGaugeLabelHeight = function () {
          return this.config.gauge_label_show ? 20 : 0;
      };
  
      c3_chart_internal_fn.initRegion = function () {
          var $$ = this;
          $$.region = $$.main.append('g')
              .attr("clip-path", $$.clipPath)
              .attr("class", CLASS.regions);
      };
      c3_chart_internal_fn.updateRegion = function (duration) {
          var $$ = this, config = $$.config;
  
          // hide if arc type
          $$.region.style('visibility', $$.hasArcType() ? 'hidden' : 'visible');
  
          $$.mainRegion = $$.main.select('.' + CLASS.regions).selectAll('.' + CLASS.region)
              .data(config.regions);
          $$.mainRegion.enter().append('g')
              .attr('class', $$.classRegion.bind($$))
            .append('rect')
              .style("fill-opacity", 0);
          $$.mainRegion.exit().transition().duration(duration)
              .style("opacity", 0)
              .remove();
      };
      c3_chart_internal_fn.redrawRegion = function (withTransition) {
          var $$ = this,
              regions = $$.mainRegion.selectAll('rect'),
              x = $$.regionX.bind($$),
              y = $$.regionY.bind($$),
              w = $$.regionWidth.bind($$),
              h = $$.regionHeight.bind($$);
          return [
              (withTransition ? regions.transition() : regions)
                  .attr("x", x)
                  .attr("y", y)
                  .attr("width", w)
                  .attr("height", h)
                  .style("fill-opacity", function (d) { return isValue(d.opacity) ? d.opacity : 0.1; })
          ];
      };
      c3_chart_internal_fn.regionX = function (d) {
          var $$ = this, config = $$.config,
              xPos, yScale = d.axis === 'y' ? $$.y : $$.y2;
          if (d.axis === 'y' || d.axis === 'y2') {
              xPos = config.axis_rotated ? ('start' in d ? yScale(d.start) : 0) : 0;
          } else {
              xPos = config.axis_rotated ? 0 : ('start' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.start) : d.start) : 0);
          }
          return xPos;
      };
      c3_chart_internal_fn.regionY = function (d) {
          var $$ = this, config = $$.config,
              yPos, yScale = d.axis === 'y' ? $$.y : $$.y2;
          if (d.axis === 'y' || d.axis === 'y2') {
              yPos = config.axis_rotated ? 0 : ('end' in d ? yScale(d.end) : 0);
          } else {
              yPos = config.axis_rotated ? ('start' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.start) : d.start) : 0) : 0;
          }
          return yPos;
      };
      c3_chart_internal_fn.regionWidth = function (d) {
          var $$ = this, config = $$.config,
              start = $$.regionX(d), end, yScale = d.axis === 'y' ? $$.y : $$.y2;
          if (d.axis === 'y' || d.axis === 'y2') {
              end = config.axis_rotated ? ('end' in d ? yScale(d.end) : $$.width) : $$.width;
          } else {
              end = config.axis_rotated ? $$.width : ('end' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.end) : d.end) : $$.width);
          }
          return end < start ? 0 : end - start;
      };
      c3_chart_internal_fn.regionHeight = function (d) {
          var $$ = this, config = $$.config,
              start = this.regionY(d), end, yScale = d.axis === 'y' ? $$.y : $$.y2;
          if (d.axis === 'y' || d.axis === 'y2') {
              end = config.axis_rotated ? $$.height : ('start' in d ? yScale(d.start) : $$.height);
          } else {
              end = config.axis_rotated ? ('end' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.end) : d.end) : $$.height) : $$.height;
          }
          return end < start ? 0 : end - start;
      };
      c3_chart_internal_fn.isRegionOnX = function (d) {
          return !d.axis || d.axis === 'x';
      };
  
      c3_chart_internal_fn.drag = function (mouse) {
          var $$ = this, config = $$.config, main = $$.main, d3 = $$.d3;
          var sx, sy, mx, my, minX, maxX, minY, maxY;
  
          if ($$.hasArcType()) { return; }
          if (! config.data_selection_enabled) { return; } // do nothing if not selectable
          if (config.zoom_enabled && ! $$.zoom.altDomain) { return; } // skip if zoomable because of conflict drag dehavior
          if (!config.data_selection_multiple) { return; } // skip when single selection because drag is used for multiple selection
  
          sx = $$.dragStart[0];
          sy = $$.dragStart[1];
          mx = mouse[0];
          my = mouse[1];
          minX = Math.min(sx, mx);
          maxX = Math.max(sx, mx);
          minY = (config.data_selection_grouped) ? $$.margin.top : Math.min(sy, my);
          maxY = (config.data_selection_grouped) ? $$.height : Math.max(sy, my);
  
          main.select('.' + CLASS.dragarea)
              .attr('x', minX)
              .attr('y', minY)
              .attr('width', maxX - minX)
              .attr('height', maxY - minY);
          // TODO: binary search when multiple xs
          main.selectAll('.' + CLASS.shapes).selectAll('.' + CLASS.shape)
              .filter(function (d) { return config.data_selection_isselectable(d); })
              .each(function (d, i) {
                  var shape = d3.select(this),
                      isSelected = shape.classed(CLASS.SELECTED),
                      isIncluded = shape.classed(CLASS.INCLUDED),
                      _x, _y, _w, _h, toggle, isWithin = false, box;
                  if (shape.classed(CLASS.circle)) {
                      _x = shape.attr("cx") * 1;
                      _y = shape.attr("cy") * 1;
                      toggle = $$.togglePoint;
                      isWithin = minX < _x && _x < maxX && minY < _y && _y < maxY;
                  }
                  else if (shape.classed(CLASS.bar)) {
                      box = getPathBox(this);
                      _x = box.x;
                      _y = box.y;
                      _w = box.width;
                      _h = box.height;
                      toggle = $$.togglePath;
                      isWithin = !(maxX < _x || _x + _w < minX) && !(maxY < _y || _y + _h < minY);
                  } else {
                      // line/area selection not supported yet
                      return;
                  }
                  if (isWithin ^ isIncluded) {
                      shape.classed(CLASS.INCLUDED, !isIncluded);
                      // TODO: included/unincluded callback here
                      shape.classed(CLASS.SELECTED, !isSelected);
                      toggle.call($$, !isSelected, shape, d, i);
                  }
              });
      };
  
      c3_chart_internal_fn.dragstart = function (mouse) {
          var $$ = this, config = $$.config;
          if ($$.hasArcType()) { return; }
          if (! config.data_selection_enabled) { return; } // do nothing if not selectable
          $$.dragStart = mouse;
          $$.main.select('.' + CLASS.chart).append('rect')
              .attr('class', CLASS.dragarea)
              .style('opacity', 0.1);
          $$.dragging = true;
      };
  
      c3_chart_internal_fn.dragend = function () {
          var $$ = this, config = $$.config;
          if ($$.hasArcType()) { return; }
          if (! config.data_selection_enabled) { return; } // do nothing if not selectable
          $$.main.select('.' + CLASS.dragarea)
              .transition().duration(100)
              .style('opacity', 0)
              .remove();
          $$.main.selectAll('.' + CLASS.shape)
              .classed(CLASS.INCLUDED, false);
          $$.dragging = false;
      };
  
      c3_chart_internal_fn.selectPoint = function (target, d, i) {
          var $$ = this, config = $$.config,
              cx = (config.axis_rotated ? $$.circleY : $$.circleX).bind($$),
              cy = (config.axis_rotated ? $$.circleX : $$.circleY).bind($$),
              r = $$.pointSelectR.bind($$);
          config.data_onselected.call($$.api, d, target.node());
          // add selected-circle on low layer g
          $$.main.select('.' + CLASS.selectedCircles + $$.getTargetSelectorSuffix(d.id)).selectAll('.' + CLASS.selectedCircle + '-' + i)
              .data([d])
              .enter().append('circle')
              .attr("class", function () { return $$.generateClass(CLASS.selectedCircle, i); })
              .attr("cx", cx)
              .attr("cy", cy)
              .attr("stroke", function () { return $$.color(d); })
              .attr("r", function (d) { return $$.pointSelectR(d) * 1.4; })
              .transition().duration(100)
              .attr("r", r);
      };
      c3_chart_internal_fn.unselectPoint = function (target, d, i) {
          var $$ = this;
          $$.config.data_onunselected(d, target.node());
          // remove selected-circle from low layer g
          $$.main.select('.' + CLASS.selectedCircles + $$.getTargetSelectorSuffix(d.id)).selectAll('.' + CLASS.selectedCircle + '-' + i)
              .transition().duration(100).attr('r', 0)
              .remove();
      };
      c3_chart_internal_fn.togglePoint = function (selected, target, d, i) {
          selected ? this.selectPoint(target, d, i) : this.unselectPoint(target, d, i);
      };
      c3_chart_internal_fn.selectPath = function (target, d) {
          var $$ = this;
          $$.config.data_onselected.call($$, d, target.node());
          target.transition().duration(100)
              .style("fill", function () { return $$.d3.rgb($$.color(d)).brighter(0.75); });
      };
      c3_chart_internal_fn.unselectPath = function (target, d) {
          var $$ = this;
          $$.config.data_onunselected.call($$, d, target.node());
          target.transition().duration(100)
              .style("fill", function () { return $$.color(d); });
      };
      c3_chart_internal_fn.togglePath = function (selected, target, d, i) {
          selected ? this.selectPath(target, d, i) : this.unselectPath(target, d, i);
      };
      c3_chart_internal_fn.getToggle = function (that, d) {
          var $$ = this, toggle;
          if (that.nodeName === 'circle') {
              if ($$.isStepType(d)) {
                  // circle is hidden in step chart, so treat as within the click area
                  toggle = function () {}; // TODO: how to select step chart?
              } else {
                  toggle = $$.togglePoint;
              }
          }
          else if (that.nodeName === 'path') {
              toggle = $$.togglePath;
          }
          return toggle;
      };
      c3_chart_internal_fn.toggleShape = function (that, d, i) {
          var $$ = this, d3 = $$.d3, config = $$.config,
              shape = d3.select(that), isSelected = shape.classed(CLASS.SELECTED),
              toggle = $$.getToggle(that, d).bind($$);
  
          if (config.data_selection_enabled && config.data_selection_isselectable(d)) {
              if (!config.data_selection_multiple) {
                  $$.main.selectAll('.' + CLASS.shapes + (config.data_selection_grouped ? $$.getTargetSelectorSuffix(d.id) : "")).selectAll('.' + CLASS.shape).each(function (d, i) {
                      var shape = d3.select(this);
                      if (shape.classed(CLASS.SELECTED)) { toggle(false, shape.classed(CLASS.SELECTED, false), d, i); }
                  });
              }
              shape.classed(CLASS.SELECTED, !isSelected);
              toggle(!isSelected, shape, d, i);
          }
      };
  
      c3_chart_internal_fn.initBrush = function () {
          var $$ = this, d3 = $$.d3;
          $$.brush = d3.svg.brush().on("brush", function () { $$.redrawForBrush(); });
          $$.brush.update = function () {
              if ($$.context) { $$.context.select('.' + CLASS.brush).call(this); }
              return this;
          };
          $$.brush.scale = function (scale) {
              return $$.config.axis_rotated ? this.y(scale) : this.x(scale);
          };
      };
      c3_chart_internal_fn.initSubchart = function () {
          var $$ = this, config = $$.config,
              context = $$.context = $$.svg.append("g").attr("transform", $$.getTranslate('context'));
  
          context.style('visibility', config.subchart_show ? 'visible' : 'hidden');
  
          // Define g for chart area
          context.append('g')
              .attr("clip-path", $$.clipPathForSubchart)
              .attr('class', CLASS.chart);
  
          // Define g for bar chart area
          context.select('.' + CLASS.chart).append("g")
              .attr("class", CLASS.chartBars);
  
          // Define g for line chart area
          context.select('.' + CLASS.chart).append("g")
              .attr("class", CLASS.chartLines);
  
          // Add extent rect for Brush
          context.append("g")
              .attr("clip-path", $$.clipPath)
              .attr("class", CLASS.brush)
              .call($$.brush);
  
          // ATTENTION: This must be called AFTER chart added
          // Add Axis
          $$.axes.subx = context.append("g")
              .attr("class", CLASS.axisX)
              .attr("transform", $$.getTranslate('subx'))
              .attr("clip-path", config.axis_rotated ? "" : $$.clipPathForXAxis);
      };
      c3_chart_internal_fn.updateTargetsForSubchart = function (targets) {
          var $$ = this, context = $$.context, config = $$.config,
              contextLineEnter, contextLineUpdate, contextBarEnter, contextBarUpdate,
              classChartBar = $$.classChartBar.bind($$),
              classBars = $$.classBars.bind($$),
              classChartLine = $$.classChartLine.bind($$),
              classLines = $$.classLines.bind($$),
              classAreas = $$.classAreas.bind($$);
  
          if (config.subchart_show) {
              //-- Bar --//
              contextBarUpdate = context.select('.' + CLASS.chartBars).selectAll('.' + CLASS.chartBar)
                  .data(targets)
                  .attr('class', classChartBar);
              contextBarEnter = contextBarUpdate.enter().append('g')
                  .style('opacity', 0)
                  .attr('class', classChartBar);
              // Bars for each data
              contextBarEnter.append('g')
                  .attr("class", classBars);
  
              //-- Line --//
              contextLineUpdate = context.select('.' + CLASS.chartLines).selectAll('.' + CLASS.chartLine)
                  .data(targets)
                  .attr('class', classChartLine);
              contextLineEnter = contextLineUpdate.enter().append('g')
                  .style('opacity', 0)
                  .attr('class', classChartLine);
              // Lines for each data
              contextLineEnter.append("g")
                  .attr("class", classLines);
              // Area
              contextLineEnter.append("g")
                  .attr("class", classAreas);
  
              //-- Brush --//
              context.selectAll('.' + CLASS.brush + ' rect')
                  .attr(config.axis_rotated ? "width" : "height", config.axis_rotated ? $$.width2 : $$.height2);
          }
      };
      c3_chart_internal_fn.updateBarForSubchart = function (durationForExit) {
          var $$ = this;
          $$.contextBar = $$.context.selectAll('.' + CLASS.bars).selectAll('.' + CLASS.bar)
              .data($$.barData.bind($$));
          $$.contextBar.enter().append('path')
              .attr("class", $$.classBar.bind($$))
              .style("stroke", 'none')
              .style("fill", $$.color);
          $$.contextBar
              .style("opacity", $$.initialOpacity.bind($$));
          $$.contextBar.exit().transition().duration(durationForExit)
              .style('opacity', 0)
              .remove();
      };
      c3_chart_internal_fn.redrawBarForSubchart = function (drawBarOnSub, withTransition, duration) {
          (withTransition ? this.contextBar.transition().duration(duration) : this.contextBar)
              .attr('d', drawBarOnSub)
              .style('opacity', 1);
      };
      c3_chart_internal_fn.updateLineForSubchart = function (durationForExit) {
          var $$ = this;
          $$.contextLine = $$.context.selectAll('.' + CLASS.lines).selectAll('.' + CLASS.line)
              .data($$.lineData.bind($$));
          $$.contextLine.enter().append('path')
              .attr('class', $$.classLine.bind($$))
              .style('stroke', $$.color);
          $$.contextLine
              .style("opacity", $$.initialOpacity.bind($$));
          $$.contextLine.exit().transition().duration(durationForExit)
              .style('opacity', 0)
              .remove();
      };
      c3_chart_internal_fn.redrawLineForSubchart = function (drawLineOnSub, withTransition, duration) {
          (withTransition ? this.contextLine.transition().duration(duration) : this.contextLine)
              .attr("d", drawLineOnSub)
              .style('opacity', 1);
      };
      c3_chart_internal_fn.updateAreaForSubchart = function (durationForExit) {
          var $$ = this, d3 = $$.d3;
          $$.contextArea = $$.context.selectAll('.' + CLASS.areas).selectAll('.' + CLASS.area)
              .data($$.lineData.bind($$));
          $$.contextArea.enter().append('path')
              .attr("class", $$.classArea.bind($$))
              .style("fill", $$.color)
              .style("opacity", function () { $$.orgAreaOpacity = +d3.select(this).style('opacity'); return 0; });
          $$.contextArea
              .style("opacity", 0);
          $$.contextArea.exit().transition().duration(durationForExit)
              .style('opacity', 0)
              .remove();
      };
      c3_chart_internal_fn.redrawAreaForSubchart = function (drawAreaOnSub, withTransition, duration) {
          (withTransition ? this.contextArea.transition().duration(duration) : this.contextArea)
              .attr("d", drawAreaOnSub)
              .style("fill", this.color)
              .style("opacity", this.orgAreaOpacity);
      };
      c3_chart_internal_fn.redrawSubchart = function (withSubchart, transitions, duration, durationForExit, areaIndices, barIndices, lineIndices) {
          var $$ = this, d3 = $$.d3, config = $$.config,
              drawAreaOnSub, drawBarOnSub, drawLineOnSub;
  
          $$.context.style('visibility', config.subchart_show ? 'visible' : 'hidden');
  
          // subchart
          if (config.subchart_show) {
              // reflect main chart to extent on subchart if zoomed
              if (d3.event && d3.event.type === 'zoom') {
                  $$.brush.extent($$.x.orgDomain()).update();
              }
              // update subchart elements if needed
              if (withSubchart) {
  
                  // extent rect
                  if (!$$.brush.empty()) {
                      $$.brush.extent($$.x.orgDomain()).update();
                  }
                  // setup drawer - MEMO: this must be called after axis updated
                  drawAreaOnSub = $$.generateDrawArea(areaIndices, true);
                  drawBarOnSub = $$.generateDrawBar(barIndices, true);
                  drawLineOnSub = $$.generateDrawLine(lineIndices, true);
  
                  $$.updateBarForSubchart(duration);
                  $$.updateLineForSubchart(duration);
                  $$.updateAreaForSubchart(duration);
  
                  $$.redrawBarForSubchart(drawBarOnSub, duration, duration);
                  $$.redrawLineForSubchart(drawLineOnSub, duration, duration);
                  $$.redrawAreaForSubchart(drawAreaOnSub, duration, duration);
              }
          }
      };
      c3_chart_internal_fn.redrawForBrush = function () {
          var $$ = this, x = $$.x;
          $$.redraw({
              withTransition: false,
              withY: $$.config.zoom_rescale,
              withSubchart: false,
              withUpdateXDomain: true,
              withDimension: false
          });
          $$.config.subchart_onbrush.call($$.api, x.orgDomain());
      };
      c3_chart_internal_fn.transformContext = function (withTransition, transitions) {
          var $$ = this, subXAxis;
          if (transitions && transitions.axisSubX) {
              subXAxis = transitions.axisSubX;
          } else {
              subXAxis = $$.context.select('.' + CLASS.axisX);
              if (withTransition) { subXAxis = subXAxis.transition(); }
          }
          $$.context.attr("transform", $$.getTranslate('context'));
          subXAxis.attr("transform", $$.getTranslate('subx'));
      };
      c3_chart_internal_fn.getDefaultExtent = function () {
          var $$ = this, config = $$.config,
              extent = isFunction(config.axis_x_extent) ? config.axis_x_extent($$.getXDomain($$.data.targets)) : config.axis_x_extent;
          if ($$.isTimeSeries()) {
              extent = [$$.parseDate(extent[0]), $$.parseDate(extent[1])];
          }
          return extent;
      };
  
      c3_chart_internal_fn.initZoom = function () {
          var $$ = this, d3 = $$.d3, config = $$.config, startEvent;
  
          $$.zoom = d3.behavior.zoom()
              .on("zoomstart", function () {
                  startEvent = d3.event.sourceEvent;
                  $$.zoom.altDomain = d3.event.sourceEvent.altKey ? $$.x.orgDomain() : null;
                  config.zoom_onzoomstart.call($$.api, d3.event.sourceEvent);
              })
              .on("zoom", function () {
                  $$.redrawForZoom.call($$);
              })
              .on('zoomend', function () {
                  var event = d3.event.sourceEvent;
                  // if click, do nothing. otherwise, click interaction will be canceled.
                  if (event && startEvent.clientX === event.clientX && startEvent.clientY === event.clientY) {
                      return;
                  }
                  $$.redrawEventRect();
                  $$.updateZoom();
                  config.zoom_onzoomend.call($$.api, $$.x.orgDomain());
              });
          $$.zoom.scale = function (scale) {
              return config.axis_rotated ? this.y(scale) : this.x(scale);
          };
          $$.zoom.orgScaleExtent = function () {
              var extent = config.zoom_extent ? config.zoom_extent : [1, 10];
              return [extent[0], Math.max($$.getMaxDataCount() / extent[1], extent[1])];
          };
          $$.zoom.updateScaleExtent = function () {
              var ratio = diffDomain($$.x.orgDomain()) / diffDomain($$.orgXDomain),
                  extent = this.orgScaleExtent();
              this.scaleExtent([extent[0] * ratio, extent[1] * ratio]);
              return this;
          };
      };
      c3_chart_internal_fn.updateZoom = function () {
          var $$ = this, z = $$.config.zoom_enabled ? $$.zoom : function () {};
          $$.main.select('.' + CLASS.zoomRect).call(z).on("dblclick.zoom", null);
          $$.main.selectAll('.' + CLASS.eventRect).call(z).on("dblclick.zoom", null);
      };
      c3_chart_internal_fn.redrawForZoom = function () {
          var $$ = this, d3 = $$.d3, config = $$.config, zoom = $$.zoom, x = $$.x;
          if (!config.zoom_enabled) {
              return;
          }
          if ($$.filterTargetsToShow($$.data.targets).length === 0) {
              return;
          }
          if (d3.event.sourceEvent.type === 'mousemove' && zoom.altDomain) {
              x.domain(zoom.altDomain);
              zoom.scale(x).updateScaleExtent();
              return;
          }
          if ($$.isCategorized() && x.orgDomain()[0] === $$.orgXDomain[0]) {
              x.domain([$$.orgXDomain[0] - 1e-10, x.orgDomain()[1]]);
          }
          $$.redraw({
              withTransition: false,
              withY: config.zoom_rescale,
              withSubchart: false,
              withEventRect: false,
              withDimension: false
          });
          if (d3.event.sourceEvent.type === 'mousemove') {
              $$.cancelClick = true;
          }
          config.zoom_onzoom.call($$.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,
              ids = [];
  
          return function (d) {
              var id = d.id || (d.data && d.data.id) || d, color;
  
              // if callback function is provided
              if (colors[id] instanceof Function) {
                  color = colors[id](d);
              }
              // if specified, choose that color
              else if (colors[id]) {
                  color = colors[id];
              }
              // if not specified, choose from pattern
              else {
                  if (ids.indexOf(id) < 0) { ids.push(id); }
                  color = pattern[ids.indexOf(id) % pattern.length];
                  colors[id] = color;
              }
              return callback instanceof Function ? callback(color, d) : color;
          };
      };
      c3_chart_internal_fn.generateLevelColor = function () {
          var $$ = this, config = $$.config,
              colors = config.color_pattern,
              threshold = config.color_threshold,
              asValue = threshold.unit === 'value',
              values = threshold.values && threshold.values.length ? threshold.values : [],
              max = threshold.max || 100;
          return notEmpty(config.color_threshold) ? function (value) {
              var i, v, color = colors[colors.length - 1];
              for (i = 0; i < values.length; i++) {
                  v = asValue ? value : (value * 100 / max);
                  if (v < values[i]) {
                      color = colors[i];
                      break;
                  }
              }
              return color;
          } : null;
      };
  
      c3_chart_internal_fn.getYFormat = function (forArc) {
          var $$ = this,
              formatForY = forArc && !$$.hasType('gauge') ? $$.defaultArcValueFormat : $$.yFormat,
              formatForY2 = forArc && !$$.hasType('gauge') ? $$.defaultArcValueFormat : $$.y2Format;
          return function (v, ratio, id) {
              var format = $$.axis.getId(id) === 'y2' ? formatForY2 : formatForY;
              return format.call($$, v, ratio);
          };
      };
      c3_chart_internal_fn.yFormat = function (v) {
          var $$ = this, config = $$.config,
              format = config.axis_y_tick_format ? config.axis_y_tick_format : $$.defaultValueFormat;
          return format(v);
      };
      c3_chart_internal_fn.y2Format = function (v) {
          var $$ = this, config = $$.config,
              format = config.axis_y2_tick_format ? config.axis_y2_tick_format : $$.defaultValueFormat;
          return format(v);
      };
      c3_chart_internal_fn.defaultValueFormat = function (v) {
          return isValue(v) ? +v : "";
      };
      c3_chart_internal_fn.defaultArcValueFormat = function (v, ratio) {
          return (ratio * 100).toFixed(1) + '%';
      };
      c3_chart_internal_fn.dataLabelFormat = function (targetId) {
          var $$ = this, data_labels = $$.config.data_labels,
              format, defaultFormat = function (v) { return isValue(v) ? +v : ""; };
          // find format according to axis id
          if (typeof data_labels.format === 'function') {
              format = data_labels.format;
          } else if (typeof data_labels.format === 'object') {
              if (data_labels.format[targetId]) {
                  format = data_labels.format[targetId] === true ? defaultFormat : data_labels.format[targetId];
              } else {
                  format = function () { return ''; };
              }
          } else {
              format = defaultFormat;
          }
          return format;
      };
  
      c3_chart_internal_fn.hasCaches = function (ids) {
          for (var i = 0; i < ids.length; i++) {
              if (! (ids[i] in this.cache)) { return false; }
          }
          return true;
      };
      c3_chart_internal_fn.addCache = function (id, target) {
          this.cache[id] = this.cloneTarget(target);
      };
      c3_chart_internal_fn.getCaches = function (ids) {
          var targets = [], i;
          for (i = 0; i < ids.length; i++) {
              if (ids[i] in this.cache) { targets.push(this.cloneTarget(this.cache[ids[i]])); }
          }
          return targets;
      };
  
      var CLASS = c3_chart_internal_fn.CLASS = {
          target: 'c3-target',
          chart: 'c3-chart',
          chartLine: 'c3-chart-line',
          chartLines: 'c3-chart-lines',
          chartBar: 'c3-chart-bar',
          chartBars: 'c3-chart-bars',
          chartText: 'c3-chart-text',
          chartTexts: 'c3-chart-texts',
          chartArc: 'c3-chart-arc',
          chartArcs: 'c3-chart-arcs',
          chartArcsTitle: 'c3-chart-arcs-title',
          chartArcsBackground: 'c3-chart-arcs-background',
          chartArcsGaugeUnit: 'c3-chart-arcs-gauge-unit',
          chartArcsGaugeMax: 'c3-chart-arcs-gauge-max',
          chartArcsGaugeMin: 'c3-chart-arcs-gauge-min',
          selectedCircle: 'c3-selected-circle',
          selectedCircles: 'c3-selected-circles',
          eventRect: 'c3-event-rect',
          eventRects: 'c3-event-rects',
          eventRectsSingle: 'c3-event-rects-single',
          eventRectsMultiple: 'c3-event-rects-multiple',
          zoomRect: 'c3-zoom-rect',
          brush: 'c3-brush',
          focused: 'c3-focused',
          defocused: 'c3-defocused',
          region: 'c3-region',
          regions: 'c3-regions',
          tooltipContainer: 'c3-tooltip-container',
          tooltip: 'c3-tooltip',
          tooltipName: 'c3-tooltip-name',
          shape: 'c3-shape',
          shapes: 'c3-shapes',
          line: 'c3-line',
          lines: 'c3-lines',
          bar: 'c3-bar',
          bars: 'c3-bars',
          circle: 'c3-circle',
          circles: 'c3-circles',
          arc: 'c3-arc',
          arcs: 'c3-arcs',
          area: 'c3-area',
          areas: 'c3-areas',
          empty: 'c3-empty',
          text: 'c3-text',
          texts: 'c3-texts',
          gaugeValue: 'c3-gauge-value',
          grid: 'c3-grid',
          gridLines: 'c3-grid-lines',
          xgrid: 'c3-xgrid',
          xgrids: 'c3-xgrids',
          xgridLine: 'c3-xgrid-line',
          xgridLines: 'c3-xgrid-lines',
          xgridFocus: 'c3-xgrid-focus',
          ygrid: 'c3-ygrid',
          ygrids: 'c3-ygrids',
          ygridLine: 'c3-ygrid-line',
          ygridLines: 'c3-ygrid-lines',
          axis: 'c3-axis',
          axisX: 'c3-axis-x',
          axisXLabel: 'c3-axis-x-label',
          axisY: 'c3-axis-y',
          axisYLabel: 'c3-axis-y-label',
          axisY2: 'c3-axis-y2',
          axisY2Label: 'c3-axis-y2-label',
          legendBackground: 'c3-legend-background',
          legendItem: 'c3-legend-item',
          legendItemEvent: 'c3-legend-item-event',
          legendItemTile: 'c3-legend-item-tile',
          legendItemHidden: 'c3-legend-item-hidden',
          legendItemFocused: 'c3-legend-item-focused',
          dragarea: 'c3-dragarea',
          EXPANDED: '_expanded_',
          SELECTED: '_selected_',
          INCLUDED: '_included_'
      };
      c3_chart_internal_fn.generateClass = function (prefix, targetId) {
          return " " + prefix + " " + prefix + this.getTargetSelectorSuffix(targetId);
      };
      c3_chart_internal_fn.classText = function (d) {
          return this.generateClass(CLASS.text, d.index);
      };
      c3_chart_internal_fn.classTexts = function (d) {
          return this.generateClass(CLASS.texts, d.id);
      };
      c3_chart_internal_fn.classShape = function (d) {
          return this.generateClass(CLASS.shape, d.index);
      };
      c3_chart_internal_fn.classShapes = function (d) {
          return this.generateClass(CLASS.shapes, d.id);
      };
      c3_chart_internal_fn.classLine = function (d) {
          return this.classShape(d) + this.generateClass(CLASS.line, d.id);
      };
      c3_chart_internal_fn.classLines = function (d) {
          return this.classShapes(d) + this.generateClass(CLASS.lines, d.id);
      };
      c3_chart_internal_fn.classCircle = function (d) {
          return this.classShape(d) + this.generateClass(CLASS.circle, d.index);
      };
      c3_chart_internal_fn.classCircles = function (d) {
          return this.classShapes(d) + this.generateClass(CLASS.circles, d.id);
      };
      c3_chart_internal_fn.classBar = function (d) {
          return this.classShape(d) + this.generateClass(CLASS.bar, d.index);
      };
      c3_chart_internal_fn.classBars = function (d) {
          return this.classShapes(d) + this.generateClass(CLASS.bars, d.id);
      };
      c3_chart_internal_fn.classArc = function (d) {
          return this.classShape(d.data) + this.generateClass(CLASS.arc, d.data.id);
      };
      c3_chart_internal_fn.classArcs = function (d) {
          return this.classShapes(d.data) + this.generateClass(CLASS.arcs, d.data.id);
      };
      c3_chart_internal_fn.classArea = function (d) {
          return this.classShape(d) + this.generateClass(CLASS.area, d.id);
      };
      c3_chart_internal_fn.classAreas = function (d) {
          return this.classShapes(d) + this.generateClass(CLASS.areas, d.id);
      };
      c3_chart_internal_fn.classRegion = function (d, i) {
          return this.generateClass(CLASS.region, i) + ' ' + ('class' in d ? d['class'] : '');
      };
      c3_chart_internal_fn.classEvent = function (d) {
          return this.generateClass(CLASS.eventRect, d.index);
      };
      c3_chart_internal_fn.classTarget = function (id) {
          var $$ = this;
          var additionalClassSuffix = $$.config.data_classes[id], additionalClass = '';
          if (additionalClassSuffix) {
              additionalClass = ' ' + CLASS.target + '-' + additionalClassSuffix;
          }
          return $$.generateClass(CLASS.target, id) + additionalClass;
      };
      c3_chart_internal_fn.classFocus = function (d) {
          return this.classFocused(d) + this.classDefocused(d);
      };
      c3_chart_internal_fn.classFocused = function (d) {
          return ' ' + (this.focusedTargetIds.indexOf(d.id) >= 0 ? CLASS.focused : '');
      };
      c3_chart_internal_fn.classDefocused = function (d) {
          return ' ' + (this.defocusedTargetIds.indexOf(d.id) >= 0 ? CLASS.defocused : '');
      };
      c3_chart_internal_fn.classChartText = function (d) {
          return CLASS.chartText + this.classTarget(d.id);
      };
      c3_chart_internal_fn.classChartLine = function (d) {
          return CLASS.chartLine + this.classTarget(d.id);
      };
      c3_chart_internal_fn.classChartBar = function (d) {
          return CLASS.chartBar + this.classTarget(d.id);
      };
      c3_chart_internal_fn.classChartArc = function (d) {
          return CLASS.chartArc + this.classTarget(d.data.id);
      };
      c3_chart_internal_fn.getTargetSelectorSuffix = function (targetId) {
          return targetId || targetId === 0 ? ('-' + targetId).replace(/[\s?!@#$%^&*()_=+,.<>'":;\[\]\/|~`{}\\]/g, '-') : '';
      };
      c3_chart_internal_fn.selectorTarget = function (id, prefix) {
          return (prefix || '') + '.' + CLASS.target + this.getTargetSelectorSuffix(id);
      };
      c3_chart_internal_fn.selectorTargets = function (ids, prefix) {
          var $$ = this;
          ids = ids || [];
          return ids.length ? ids.map(function (id) { return $$.selectorTarget(id, prefix); }) : null;
      };
      c3_chart_internal_fn.selectorLegend = function (id) {
          return '.' + CLASS.legendItem + this.getTargetSelectorSuffix(id);
      };
      c3_chart_internal_fn.selectorLegends = function (ids) {
          var $$ = this;
          return ids && ids.length ? ids.map(function (id) { return $$.selectorLegend(id); }) : null;
      };
  
      var isValue = c3_chart_internal_fn.isValue = function (v) {
          return v || v === 0;
      },
          isFunction = c3_chart_internal_fn.isFunction = function (o) {
              return typeof o === 'function';
          },
          isString = c3_chart_internal_fn.isString = function (o) {
              return typeof o === 'string';
          },
          isUndefined = c3_chart_internal_fn.isUndefined = function (v) {
              return typeof v === 'undefined';
          },
          isDefined = c3_chart_internal_fn.isDefined = function (v) {
              return typeof v !== 'undefined';
          },
          ceil10 = c3_chart_internal_fn.ceil10 = function (v) {
              return Math.ceil(v / 10) * 10;
          },
          asHalfPixel = c3_chart_internal_fn.asHalfPixel = function (n) {
              return Math.ceil(n) + 0.5;
          },
          diffDomain = c3_chart_internal_fn.diffDomain = function (d) {
              return d[1] - d[0];
          },
          isEmpty = c3_chart_internal_fn.isEmpty = function (o) {
              return !o || (isString(o) && o.length === 0) || (typeof o === 'object' && Object.keys(o).length === 0);
          },
          notEmpty = c3_chart_internal_fn.notEmpty = function (o) {
              return Object.keys(o).length > 0;
          },
          getOption = c3_chart_internal_fn.getOption = function (options, key, defaultValue) {
              return isDefined(options[key]) ? options[key] : defaultValue;
          },
          hasValue = c3_chart_internal_fn.hasValue = function (dict, value) {
              var found = false;
              Object.keys(dict).forEach(function (key) {
                  if (dict[key] === value) { found = true; }
              });
              return found;
          },
          getPathBox = c3_chart_internal_fn.getPathBox = function (path) {
              var box = path.getBoundingClientRect(),
                  items = [path.pathSegList.getItem(0), path.pathSegList.getItem(1)],
                  minX = items[0].x, minY = Math.min(items[0].y, items[1].y);
              return {x: minX, y: minY, width: box.width, height: box.height};
          };
  
      c3_chart_fn.focus = function (targetIds) {
          var $$ = this.internal, candidates;
  
          targetIds = $$.mapToTargetIds(targetIds);
          candidates = $$.svg.selectAll($$.selectorTargets(targetIds.filter($$.isTargetToShow, $$))),
  
          this.revert();
          this.defocus();
          candidates.classed(CLASS.focused, true).classed(CLASS.defocused, false);
          if ($$.hasArcType()) {
              $$.expandArc(targetIds);
          }
          $$.toggleFocusLegend(targetIds, true);
  
          $$.focusedTargetIds = targetIds;
          $$.defocusedTargetIds = $$.defocusedTargetIds.filter(function (id) {
              return targetIds.indexOf(id) < 0;
          });
      };
  
      c3_chart_fn.defocus = function (targetIds) {
          var $$ = this.internal, candidates;
  
          targetIds = $$.mapToTargetIds(targetIds);
          candidates = $$.svg.selectAll($$.selectorTargets(targetIds.filter($$.isTargetToShow, $$))),
  
          candidates.classed(CLASS.focused, false).classed(CLASS.defocused, true);
          if ($$.hasArcType()) {
              $$.unexpandArc(targetIds);
          }
          $$.toggleFocusLegend(targetIds, false);
  
          $$.focusedTargetIds = $$.focusedTargetIds.filter(function (id) {
              return targetIds.indexOf(id) < 0;
          });
          $$.defocusedTargetIds = targetIds;
      };
  
      c3_chart_fn.revert = function (targetIds) {
          var $$ = this.internal, candidates;
  
          targetIds = $$.mapToTargetIds(targetIds);
          candidates = $$.svg.selectAll($$.selectorTargets(targetIds)); // should be for all targets
  
          candidates.classed(CLASS.focused, false).classed(CLASS.defocused, false);
          if ($$.hasArcType()) {
              $$.unexpandArc(targetIds);
          }
          if ($$.config.legend_show) {
              $$.showLegend(targetIds.filter($$.isLegendToShow.bind($$)));
              $$.legend.selectAll($$.selectorLegends(targetIds))
                  .filter(function () {
                      return $$.d3.select(this).classed(CLASS.legendItemFocused);
                  })
                  .classed(CLASS.legendItemFocused, false);
          }
  
          $$.focusedTargetIds = [];
          $$.defocusedTargetIds = [];
      };
  
      c3_chart_fn.show = function (targetIds, options) {
          var $$ = this.internal, targets;
  
          targetIds = $$.mapToTargetIds(targetIds);
          options = options || {};
  
          $$.removeHiddenTargetIds(targetIds);
          targets = $$.svg.selectAll($$.selectorTargets(targetIds));
  
          targets.transition()
              .style('opacity', 1, 'important')
              .call($$.endall, function () {
                  targets.style('opacity', null).style('opacity', 1);
              });
  
          if (options.withLegend) {
              $$.showLegend(targetIds);
          }
  
          $$.redraw({withUpdateOrgXDomain: true, withUpdateXDomain: true, withLegend: true});
      };
  
      c3_chart_fn.hide = function (targetIds, options) {
          var $$ = this.internal, targets;
  
          targetIds = $$.mapToTargetIds(targetIds);
          options = options || {};
  
          $$.addHiddenTargetIds(targetIds);
          targets = $$.svg.selectAll($$.selectorTargets(targetIds));
  
          targets.transition()
              .style('opacity', 0, 'important')
              .call($$.endall, function () {
                  targets.style('opacity', null).style('opacity', 0);
              });
  
          if (options.withLegend) {
              $$.hideLegend(targetIds);
          }
  
          $$.redraw({withUpdateOrgXDomain: true, withUpdateXDomain: true, withLegend: true});
      };
  
      c3_chart_fn.toggle = function (targetIds, options) {
          var that = this, $$ = this.internal;
          $$.mapToTargetIds(targetIds).forEach(function (targetId) {
              $$.isTargetToShow(targetId) ? that.hide(targetId, options) : that.show(targetId, options);
          });
      };
  
      c3_chart_fn.zoom = function (domain) {
          var $$ = this.internal;
          if (domain) {
              if ($$.isTimeSeries()) {
                  domain = domain.map(function (x) { return $$.parseDate(x); });
              }
              $$.brush.extent(domain);
              $$.redraw({withUpdateXDomain: true, withY: $$.config.zoom_rescale});
              $$.config.zoom_onzoom.call(this, $$.x.orgDomain());
          }
          return $$.brush.extent();
      };
      c3_chart_fn.zoom.enable = function (enabled) {
          var $$ = this.internal;
          $$.config.zoom_enabled = enabled;
          $$.updateAndRedraw();
      };
      c3_chart_fn.unzoom = function () {
          var $$ = this.internal;
          $$.brush.clear().update();
          $$.redraw({withUpdateXDomain: true});
      };
  
      c3_chart_fn.load = function (args) {
          var $$ = this.internal, config = $$.config;
          // update xs if specified
          if (args.xs) {
              $$.addXs(args.xs);
          }
          // update classes if exists
          if ('classes' in args) {
              Object.keys(args.classes).forEach(function (id) {
                  config.data_classes[id] = args.classes[id];
              });
          }
          // update categories if exists
          if ('categories' in args && $$.isCategorized()) {
              config.axis_x_categories = args.categories;
          }
          // update axes if exists
          if ('axes' in args) {
              Object.keys(args.axes).forEach(function (id) {
                  config.data_axes[id] = args.axes[id];
              });
          }
          // use cache if exists
          if ('cacheIds' in args && $$.hasCaches(args.cacheIds)) {
              $$.load($$.getCaches(args.cacheIds), args.done);
              return;
          }
          // unload if needed
          if ('unload' in args) {
              // TODO: do not unload if target will load (included in url/rows/columns)
              $$.unload($$.mapToTargetIds((typeof args.unload === 'boolean' && args.unload) ? null : args.unload), function () {
                  $$.loadFromArgs(args);
              });
          } else {
              $$.loadFromArgs(args);
          }
      };
  
      c3_chart_fn.unload = function (args) {
          var $$ = this.internal;
          args = args || {};
          if (args instanceof Array) {
              args = {ids: args};
          } else if (typeof args === 'string') {
              args = {ids: [args]};
          }
          $$.unload($$.mapToTargetIds(args.ids), function () {
              $$.redraw({withUpdateOrgXDomain: true, withUpdateXDomain: true, withLegend: true});
              if (args.done) { args.done(); }
          });
      };
  
      c3_chart_fn.flow = function (args) {
          var $$ = this.internal,
              targets, data, notfoundIds = [], orgDataCount = $$.getMaxDataCount(),
              dataCount, domain, baseTarget, baseValue, length = 0, tail = 0, diff, to;
  
          if (args.json) {
              data = $$.convertJsonToData(args.json, args.keys);
          }
          else if (args.rows) {
              data = $$.convertRowsToData(args.rows);
          }
          else if (args.columns) {
              data = $$.convertColumnsToData(args.columns);
          }
          else {
              return;
          }
          targets = $$.convertDataToTargets(data, true);
  
          // Update/Add data
          $$.data.targets.forEach(function (t) {
              var found = false, i, j;
              for (i = 0; i < targets.length; i++) {
                  if (t.id === targets[i].id) {
                      found = true;
  
                      if (t.values[t.values.length - 1]) {
                          tail = t.values[t.values.length - 1].index + 1;
                      }
                      length = targets[i].values.length;
  
                      for (j = 0; j < length; j++) {
                          targets[i].values[j].index = tail + j;
                          if (!$$.isTimeSeries()) {
                              targets[i].values[j].x = tail + j;
                          }
                      }
                      t.values = t.values.concat(targets[i].values);
  
                      targets.splice(i, 1);
                      break;
                  }
              }
              if (!found) { notfoundIds.push(t.id); }
          });
  
          // Append null for not found targets
          $$.data.targets.forEach(function (t) {
              var i, j;
              for (i = 0; i < notfoundIds.length; i++) {
                  if (t.id === notfoundIds[i]) {
                      tail = t.values[t.values.length - 1].index + 1;
                      for (j = 0; j < length; j++) {
                          t.values.push({
                              id: t.id,
                              index: tail + j,
                              x: $$.isTimeSeries() ? $$.getOtherTargetX(tail + j) : tail + j,
                              value: null
                          });
                      }
                  }
              }
          });
  
          // Generate null values for new target
          if ($$.data.targets.length) {
              targets.forEach(function (t) {
                  var i, missing = [];
                  for (i = $$.data.targets[0].values[0].index; i < tail; i++) {
                      missing.push({
                          id: t.id,
                          index: i,
                          x: $$.isTimeSeries() ? $$.getOtherTargetX(i) : i,
                          value: null
                      });
                  }
                  t.values.forEach(function (v) {
                      v.index += tail;
                      if (!$$.isTimeSeries()) {
                          v.x += tail;
                      }
                  });
                  t.values = missing.concat(t.values);
              });
          }
          $$.data.targets = $$.data.targets.concat(targets); // add remained
  
          // check data count because behavior needs to change when it's only one
          dataCount = $$.getMaxDataCount();
          baseTarget = $$.data.targets[0];
          baseValue = baseTarget.values[0];
  
          // Update length to flow if needed
          if (isDefined(args.to)) {
              length = 0;
              to = $$.isTimeSeries() ? $$.parseDate(args.to) : args.to;
              baseTarget.values.forEach(function (v) {
                  if (v.x < to) { length++; }
              });
          } else if (isDefined(args.length)) {
              length = args.length;
          }
  
          // If only one data, update the domain to flow from left edge of the chart
          if (!orgDataCount) {
              if ($$.isTimeSeries()) {
                  if (baseTarget.values.length > 1) {
                      diff = baseTarget.values[baseTarget.values.length - 1].x - baseValue.x;
                  } else {
                      diff = baseValue.x - $$.getXDomain($$.data.targets)[0];
                  }
              } else {
                  diff = 1;
              }
              domain = [baseValue.x - diff, baseValue.x];
              $$.updateXDomain(null, true, true, false, domain);
          } else if (orgDataCount === 1) {
              if ($$.isTimeSeries()) {
                  diff = (baseTarget.values[baseTarget.values.length - 1].x - baseValue.x) / 2;
                  domain = [new Date(+baseValue.x - diff), new Date(+baseValue.x + diff)];
                  $$.updateXDomain(null, true, true, false, domain);
              }
          }
  
          // Set targets
          $$.updateTargets($$.data.targets);
  
          // Redraw with new targets
          $$.redraw({
              flow: {
                  index: baseValue.index,
                  length: length,
                  duration: isValue(args.duration) ? args.duration : $$.config.transition_duration,
                  done: args.done,
                  orgDataCount: orgDataCount,
              },
              withLegend: true,
              withTransition: orgDataCount > 1,
              withTrimXDomain: false,
              withUpdateXAxis: true,
          });
      };
  
      c3_chart_internal_fn.generateFlow = function (args) {
          var $$ = this, config = $$.config, d3 = $$.d3;
  
          return function () {
              var targets = args.targets,
                  flow = args.flow,
                  drawBar = args.drawBar,
                  drawLine = args.drawLine,
                  drawArea = args.drawArea,
                  cx = args.cx,
                  cy = args.cy,
                  xv = args.xv,
                  xForText = args.xForText,
                  yForText = args.yForText,
                  duration = args.duration;
  
              var translateX, scaleX = 1, transform,
                  flowIndex = flow.index,
                  flowLength = flow.length,
                  flowStart = $$.getValueOnIndex($$.data.targets[0].values, flowIndex),
                  flowEnd = $$.getValueOnIndex($$.data.targets[0].values, flowIndex + flowLength),
                  orgDomain = $$.x.domain(), domain,
                  durationForFlow = flow.duration || duration,
                  done = flow.done || function () {},
                  wait = $$.generateWait();
  
              var xgrid = $$.xgrid || d3.selectAll([]),
                  xgridLines = $$.xgridLines || d3.selectAll([]),
                  mainRegion = $$.mainRegion || d3.selectAll([]),
                  mainText = $$.mainText || d3.selectAll([]),
                  mainBar = $$.mainBar || d3.selectAll([]),
                  mainLine = $$.mainLine || d3.selectAll([]),
                  mainArea = $$.mainArea || d3.selectAll([]),
                  mainCircle = $$.mainCircle || d3.selectAll([]);
  
              // set flag
              $$.flowing = true;
  
              // remove head data after rendered
              $$.data.targets.forEach(function (d) {
                  d.values.splice(0, flowLength);
              });
  
              // update x domain to generate axis elements for flow
              domain = $$.updateXDomain(targets, true, true);
              // update elements related to x scale
              if ($$.updateXGrid) { $$.updateXGrid(true); }
  
              // generate transform to flow
              if (!flow.orgDataCount) { // if empty
                  if ($$.data.targets[0].values.length !== 1) {
                      translateX = $$.x(orgDomain[0]) - $$.x(domain[0]);
                  } else {
                      if ($$.isTimeSeries()) {
                          flowStart = $$.getValueOnIndex($$.data.targets[0].values, 0);
                          flowEnd = $$.getValueOnIndex($$.data.targets[0].values, $$.data.targets[0].values.length - 1);
                          translateX = $$.x(flowStart.x) - $$.x(flowEnd.x);
                      } else {
                          translateX = diffDomain(domain) / 2;
                      }
                  }
              } else if (flow.orgDataCount === 1 || flowStart.x === flowEnd.x) {
                  translateX = $$.x(orgDomain[0]) - $$.x(domain[0]);
              } else {
                  if ($$.isTimeSeries()) {
                      translateX = ($$.x(orgDomain[0]) - $$.x(domain[0]));
                  } else {
                      translateX = ($$.x(flowStart.x) - $$.x(flowEnd.x));
                  }
              }
              scaleX = (diffDomain(orgDomain) / diffDomain(domain));
              transform = 'translate(' + translateX + ',0) scale(' + scaleX + ',1)';
  
              // hide tooltip
              $$.hideXGridFocus();
              $$.hideTooltip();
  
              d3.transition().ease('linear').duration(durationForFlow).each(function () {
                  wait.add($$.axes.x.transition().call($$.xAxis));
                  wait.add(mainBar.transition().attr('transform', transform));
                  wait.add(mainLine.transition().attr('transform', transform));
                  wait.add(mainArea.transition().attr('transform', transform));
                  wait.add(mainCircle.transition().attr('transform', transform));
                  wait.add(mainText.transition().attr('transform', transform));
                  wait.add(mainRegion.filter($$.isRegionOnX).transition().attr('transform', transform));
                  wait.add(xgrid.transition().attr('transform', transform));
                  wait.add(xgridLines.transition().attr('transform', transform));
              })
              .call(wait, function () {
                  var i, shapes = [], texts = [], eventRects = [];
  
                  // remove flowed elements
                  if (flowLength) {
                      for (i = 0; i < flowLength; i++) {
                          shapes.push('.' + CLASS.shape + '-' + (flowIndex + i));
                          texts.push('.' + CLASS.text + '-' + (flowIndex + i));
                          eventRects.push('.' + CLASS.eventRect + '-' + (flowIndex + i));
                      }
                      $$.svg.selectAll('.' + CLASS.shapes).selectAll(shapes).remove();
                      $$.svg.selectAll('.' + CLASS.texts).selectAll(texts).remove();
                      $$.svg.selectAll('.' + CLASS.eventRects).selectAll(eventRects).remove();
                      $$.svg.select('.' + CLASS.xgrid).remove();
                  }
  
                  // draw again for removing flowed elements and reverting attr
                  xgrid
                      .attr('transform', null)
                      .attr($$.xgridAttr);
                  xgridLines
                      .attr('transform', null);
                  xgridLines.select('line')
                      .attr("x1", config.axis_rotated ? 0 : xv)
                      .attr("x2", config.axis_rotated ? $$.width : xv);
                  xgridLines.select('text')
                      .attr("x", config.axis_rotated ? $$.width : 0)
                      .attr("y", xv);
                  mainBar
                      .attr('transform', null)
                      .attr("d", drawBar);
                  mainLine
                      .attr('transform', null)
                      .attr("d", drawLine);
                  mainArea
                      .attr('transform', null)
                      .attr("d", drawArea);
                  mainCircle
                      .attr('transform', null)
                      .attr("cx", cx)
                      .attr("cy", cy);
                  mainText
                      .attr('transform', null)
                      .attr('x', xForText)
                      .attr('y', yForText)
                      .style('fill-opacity', $$.opacityForText.bind($$));
                  mainRegion
                      .attr('transform', null);
                  mainRegion.select('rect').filter($$.isRegionOnX)
                      .attr("x", $$.regionX.bind($$))
                      .attr("width", $$.regionWidth.bind($$));
  
                  if (config.interaction_enabled) {
                      $$.redrawEventRect();
                  }
  
                  // callback for end of flow
                  done();
  
                  $$.flowing = false;
              });
          };
      };
  
      c3_chart_fn.selected = function (targetId) {
          var $$ = this.internal, d3 = $$.d3;
          return d3.merge(
              $$.main.selectAll('.' + CLASS.shapes + $$.getTargetSelectorSuffix(targetId)).selectAll('.' + CLASS.shape)
                  .filter(function () { return d3.select(this).classed(CLASS.SELECTED); })
                  .map(function (d) { return d.map(function (d) { var data = d.__data__; return data.data ? data.data : data; }); })
          );
      };
      c3_chart_fn.select = function (ids, indices, resetOther) {
          var $$ = this.internal, d3 = $$.d3, config = $$.config;
          if (! config.data_selection_enabled) { return; }
          $$.main.selectAll('.' + CLASS.shapes).selectAll('.' + CLASS.shape).each(function (d, i) {
              var shape = d3.select(this), id = d.data ? d.data.id : d.id,
                  toggle = $$.getToggle(this, d).bind($$),
                  isTargetId = config.data_selection_grouped || !ids || ids.indexOf(id) >= 0,
                  isTargetIndex = !indices || indices.indexOf(i) >= 0,
                  isSelected = shape.classed(CLASS.SELECTED);
              // line/area selection not supported yet
              if (shape.classed(CLASS.line) || shape.classed(CLASS.area)) {
                  return;
              }
              if (isTargetId && isTargetIndex) {
                  if (config.data_selection_isselectable(d) && !isSelected) {
                      toggle(true, shape.classed(CLASS.SELECTED, true), d, i);
                  }
              } else if (isDefined(resetOther) && resetOther) {
                  if (isSelected) {
                      toggle(false, shape.classed(CLASS.SELECTED, false), d, i);
                  }
              }
          });
      };
      c3_chart_fn.unselect = function (ids, indices) {
          var $$ = this.internal, d3 = $$.d3, config = $$.config;
          if (! config.data_selection_enabled) { return; }
          $$.main.selectAll('.' + CLASS.shapes).selectAll('.' + CLASS.shape).each(function (d, i) {
              var shape = d3.select(this), id = d.data ? d.data.id : d.id,
                  toggle = $$.getToggle(this, d).bind($$),
                  isTargetId = config.data_selection_grouped || !ids || ids.indexOf(id) >= 0,
                  isTargetIndex = !indices || indices.indexOf(i) >= 0,
                  isSelected = shape.classed(CLASS.SELECTED);
              // line/area selection not supported yet
              if (shape.classed(CLASS.line) || shape.classed(CLASS.area)) {
                  return;
              }
              if (isTargetId && isTargetIndex) {
                  if (config.data_selection_isselectable(d)) {
                      if (isSelected) {
                          toggle(false, shape.classed(CLASS.SELECTED, false), d, i);
                      }
                  }
              }
          });
      };
  
      c3_chart_fn.transform = function (type, targetIds) {
          var $$ = this.internal,
              options = ['pie', 'donut'].indexOf(type) >= 0 ? {withTransform: true} : null;
          $$.transformTo(targetIds, type, options);
      };
  
      c3_chart_internal_fn.transformTo = function (targetIds, type, optionsForRedraw) {
          var $$ = this,
              withTransitionForAxis = !$$.hasArcType(),
              options = optionsForRedraw || {withTransitionForAxis: withTransitionForAxis};
          options.withTransitionForTransform = false;
          $$.transiting = false;
          $$.setTargetType(targetIds, type);
          $$.updateTargets($$.data.targets); // this is needed when transforming to arc
          $$.updateAndRedraw(options);
      };
  
      c3_chart_fn.groups = function (groups) {
          var $$ = this.internal, config = $$.config;
          if (isUndefined(groups)) { return config.data_groups; }
          config.data_groups = groups;
          $$.redraw();
          return config.data_groups;
      };
  
      c3_chart_fn.xgrids = function (grids) {
          var $$ = this.internal, config = $$.config;
          if (! grids) { return config.grid_x_lines; }
          config.grid_x_lines = grids;
          $$.redrawWithoutRescale();
          return config.grid_x_lines;
      };
      c3_chart_fn.xgrids.add = function (grids) {
          var $$ = this.internal;
          return this.xgrids($$.config.grid_x_lines.concat(grids ? grids : []));
      };
      c3_chart_fn.xgrids.remove = function (params) { // TODO: multiple
          var $$ = this.internal;
          $$.removeGridLines(params, true);
      };
  
      c3_chart_fn.ygrids = function (grids) {
          var $$ = this.internal, config = $$.config;
          if (! grids) { return config.grid_y_lines; }
          config.grid_y_lines = grids;
          $$.redrawWithoutRescale();
          return config.grid_y_lines;
      };
      c3_chart_fn.ygrids.add = function (grids) {
          var $$ = this.internal;
          return this.ygrids($$.config.grid_y_lines.concat(grids ? grids : []));
      };
      c3_chart_fn.ygrids.remove = function (params) { // TODO: multiple
          var $$ = this.internal;
          $$.removeGridLines(params, false);
      };
  
      c3_chart_fn.regions = function (regions) {
          var $$ = this.internal, config = $$.config;
          if (!regions) { return config.regions; }
          config.regions = regions;
          $$.redrawWithoutRescale();
          return config.regions;
      };
      c3_chart_fn.regions.add = function (regions) {
          var $$ = this.internal, config = $$.config;
          if (!regions) { return config.regions; }
          config.regions = config.regions.concat(regions);
          $$.redrawWithoutRescale();
          return config.regions;
      };
      c3_chart_fn.regions.remove = function (options) {
          var $$ = this.internal, config = $$.config,
              duration, classes, regions;
  
          options = options || {};
          duration = $$.getOption(options, "duration", config.transition_duration);
          classes = $$.getOption(options, "classes", [CLASS.region]);
  
          regions = $$.main.select('.' + CLASS.regions).selectAll(classes.map(function (c) { return '.' + c; }));
          (duration ? regions.transition().duration(duration) : regions)
              .style('opacity', 0)
              .remove();
  
          config.regions = config.regions.filter(function (region) {
              var found = false;
              if (!region['class']) {
                  return true;
              }
              region['class'].split(' ').forEach(function (c) {
                  if (classes.indexOf(c) >= 0) { found = true; }
              });
              return !found;
          });
  
          return config.regions;
      };
  
      c3_chart_fn.data = function (targetIds) {
          var targets = this.internal.data.targets;
          return typeof targetIds === 'undefined' ? targets : targets.filter(function (t) {
              return [].concat(targetIds).indexOf(t.id) >= 0;
          });
      };
      c3_chart_fn.data.shown = function (targetIds) {
          return this.internal.filterTargetsToShow(this.data(targetIds));
      };
      c3_chart_fn.data.values = function (targetId) {
          var targets, values = null;
          if (targetId) {
              targets = this.data(targetId);
              values = targets[0] ? targets[0].values.map(function (d) { return d.value; }) : null;
          }
          return values;
      };
      c3_chart_fn.data.names = function (names) {
          this.internal.clearLegendItemTextBoxCache();
          return this.internal.updateDataAttributes('names', names);
      };
      c3_chart_fn.data.colors = function (colors) {
          return this.internal.updateDataAttributes('colors', colors);
      };
      c3_chart_fn.data.axes = function (axes) {
          return this.internal.updateDataAttributes('axes', axes);
      };
  
      c3_chart_fn.category = function (i, category) {
          var $$ = this.internal, config = $$.config;
          if (arguments.length > 1) {
              config.axis_x_categories[i] = category;
              $$.redraw();
          }
          return config.axis_x_categories[i];
      };
      c3_chart_fn.categories = function (categories) {
          var $$ = this.internal, config = $$.config;
          if (!arguments.length) { return config.axis_x_categories; }
          config.axis_x_categories = categories;
          $$.redraw();
          return config.axis_x_categories;
      };
  
      // TODO: fix
      c3_chart_fn.color = function (id) {
          var $$ = this.internal;
          return $$.color(id); // more patterns
      };
  
      c3_chart_fn.x = function (x) {
          var $$ = this.internal;
          if (arguments.length) {
              $$.updateTargetX($$.data.targets, x);
              $$.redraw({withUpdateOrgXDomain: true, withUpdateXDomain: true});
          }
          return $$.data.xs;
      };
      c3_chart_fn.xs = function (xs) {
          var $$ = this.internal;
          if (arguments.length) {
              $$.updateTargetXs($$.data.targets, xs);
              $$.redraw({withUpdateOrgXDomain: true, withUpdateXDomain: true});
          }
          return $$.data.xs;
      };
  
      c3_chart_fn.axis = function () {};
      c3_chart_fn.axis.labels = function (labels) {
          var $$ = this.internal;
          if (arguments.length) {
              Object.keys(labels).forEach(function (axisId) {
                  $$.axis.setLabelText(axisId, labels[axisId]);
              });
              $$.axis.updateLabels();
          }
          // TODO: return some values?
      };
      c3_chart_fn.axis.max = function (max) {
          var $$ = this.internal, config = $$.config;
          if (arguments.length) {
              if (typeof max === 'object') {
                  if (isValue(max.x)) { config.axis_x_max = max.x; }
                  if (isValue(max.y)) { config.axis_y_max = max.y; }
                  if (isValue(max.y2)) { config.axis_y2_max = max.y2; }
              } else {
                  config.axis_y_max = config.axis_y2_max = max;
              }
              $$.redraw({withUpdateOrgXDomain: true, withUpdateXDomain: true});
          } else {
              return {
                  x: config.axis_x_max,
                  y: config.axis_y_max,
                  y2: config.axis_y2_max
              };
          }
      };
      c3_chart_fn.axis.min = function (min) {
          var $$ = this.internal, config = $$.config;
          if (arguments.length) {
              if (typeof min === 'object') {
                  if (isValue(min.x)) { config.axis_x_min = min.x; }
                  if (isValue(min.y)) { config.axis_y_min = min.y; }
                  if (isValue(min.y2)) { config.axis_y2_min = min.y2; }
              } else {
                  config.axis_y_min = config.axis_y2_min = min;
              }
              $$.redraw({withUpdateOrgXDomain: true, withUpdateXDomain: true});
          } else {
              return {
                  x: config.axis_x_min,
                  y: config.axis_y_min,
                  y2: config.axis_y2_min
              };
          }
      };
      c3_chart_fn.axis.range = function (range) {
          if (arguments.length) {
              if (isDefined(range.max)) { this.axis.max(range.max); }
              if (isDefined(range.min)) { this.axis.min(range.min); }
          } else {
              return {
                  max: this.axis.max(),
                  min: this.axis.min()
              };
          }
      };
  
      c3_chart_fn.legend = function () {};
      c3_chart_fn.legend.show = function (targetIds) {
          var $$ = this.internal;
          $$.showLegend($$.mapToTargetIds(targetIds));
          $$.updateAndRedraw({withLegend: true});
      };
      c3_chart_fn.legend.hide = function (targetIds) {
          var $$ = this.internal;
          $$.hideLegend($$.mapToTargetIds(targetIds));
          $$.updateAndRedraw({withLegend: true});
      };
  
      c3_chart_fn.resize = function (size) {
          var $$ = this.internal, config = $$.config;
          config.size_width = size ? size.width : null;
          config.size_height = size ? size.height : null;
          this.flush();
      };
  
      c3_chart_fn.flush = function () {
          var $$ = this.internal;
          $$.updateAndRedraw({withLegend: true, withTransition: false, withTransitionForTransform: false});
      };
  
      c3_chart_fn.destroy = function () {
          var $$ = this.internal;
  
          window.clearInterval($$.intervalForObserveInserted);
          window.onresize = null;
  
          $$.selectChart.classed('c3', false).html("");
  
          // MEMO: this is needed because the reference of some elements will not be released, then memory leak will happen.
          Object.keys($$).forEach(function (key) {
              $$[key] = null;
          });
  
          return null;
      };
  
      c3_chart_fn.tooltip = function () {};
      c3_chart_fn.tooltip.show = function (args) {
          var $$ = this.internal, index, mouse;
  
          // determine mouse position on the chart
          if (args.mouse) {
              mouse = args.mouse;
          }
  
          // determine focus data
          if (args.data) {
              if ($$.isMultipleX()) {
                  // if multiple xs, target point will be determined by mouse
                  mouse = [$$.x(args.data.x), $$.getYScale(args.data.id)(args.data.value)];
                  index = null;
              } else {
                  // TODO: when tooltip_grouped = false
                  index = isValue(args.data.index) ? args.data.index : $$.getIndexByX(args.data.x);
              }
          }
          else if (typeof args.x !== 'undefined') {
              index = $$.getIndexByX(args.x);
          }
          else if (typeof args.index !== 'undefined') {
              index = args.index;
          }
  
          // emulate mouse events to show
          $$.dispatchEvent('mouseover', index, mouse);
          $$.dispatchEvent('mousemove', index, mouse);
      };
      c3_chart_fn.tooltip.hide = function () {
          // TODO: get target data by checking the state of focus
          this.internal.dispatchEvent('mouseout', 0);
      };
  
      // Features:
      // 1. category axis
      // 2. ceil values of translate/x/y to int for half pixel antialiasing
      // 3. multiline tick text
      var tickTextCharSize;
      function c3_axis(d3, params) {
          var scale = d3.scale.linear(), orient = "bottom", innerTickSize = 6, outerTickSize, tickPadding = 3, tickValues = null, tickFormat, tickArguments;
  
          var tickOffset = 0, tickCulling = true, tickCentered;
  
          params = params || {};
          outerTickSize = params.withOuterTick ? 6 : 0;
  
          function axisX(selection, x) {
              selection.attr("transform", function (d) {
                  return "translate(" + Math.ceil(x(d) + tickOffset) + ", 0)";
              });
          }
          function axisY(selection, y) {
              selection.attr("transform", function (d) {
                  return "translate(0," + Math.ceil(y(d)) + ")";
              });
          }
          function scaleExtent(domain) {
              var start = domain[0], stop = domain[domain.length - 1];
              return start < stop ? [ start, stop ] : [ stop, start ];
          }
          function generateTicks(scale) {
              var i, domain, ticks = [];
              if (scale.ticks) {
                  return scale.ticks.apply(scale, tickArguments);
              }
              domain = scale.domain();
              for (i = Math.ceil(domain[0]); i < domain[1]; i++) {
                  ticks.push(i);
              }
              if (ticks.length > 0 && ticks[0] > 0) {
                  ticks.unshift(ticks[0] - (ticks[1] - ticks[0]));
              }
              return ticks;
          }
          function copyScale() {
              var newScale = scale.copy(), domain;
              if (params.isCategory) {
                  domain = scale.domain();
                  newScale.domain([domain[0], domain[1] - 1]);
              }
              return newScale;
          }
          function textFormatted(v) {
              var formatted = tickFormat ? tickFormat(v) : v;
              return typeof formatted !== 'undefined' ? formatted : '';
          }
          function getSizeFor1Char(tick) {
              if (tickTextCharSize) {
                  return tickTextCharSize;
              }
              var size = {
                  h: 11.5,
                  w: 5.5
              };
              tick.select('text').text(textFormatted).each(function (d) {
                  var box = this.getBoundingClientRect(),
                      text = textFormatted(d),
                      h = box.height,
                      w = text ? (box.width / text.length) : undefined;
                  if (h && w) {
                      size.h = h;
                      size.w = w;
                  }
              }).text('');
              tickTextCharSize = size;
              return size;
          }
          function axis(g) {
              g.each(function () {
                  var g = axis.g = d3.select(this);
  
                  var scale0 = this.__chart__ || scale, scale1 = this.__chart__ = copyScale();
  
                  var ticks = tickValues ? tickValues : generateTicks(scale1),
                      tick = g.selectAll(".tick").data(ticks, scale1),
                      tickEnter = tick.enter().insert("g", ".domain").attr("class", "tick").style("opacity", 1e-6),
                      // MEMO: No exit transition. The reason is this transition affects max tick width calculation because old tick will be included in the ticks.
                      tickExit = tick.exit().remove(),
                      tickUpdate = d3.transition(tick).style("opacity", 1),
                      tickTransform, tickX, tickY;
  
                  var range = scale.rangeExtent ? scale.rangeExtent() : scaleExtent(scale.range()),
                      path = g.selectAll(".domain").data([ 0 ]),
                      pathUpdate = (path.enter().append("path").attr("class", "domain"), d3.transition(path));
                  tickEnter.append("line");
                  tickEnter.append("text");
  
                  var lineEnter = tickEnter.select("line"),
                      lineUpdate = tickUpdate.select("line"),
                      textEnter = tickEnter.select("text"),
                      textUpdate = tickUpdate.select("text");
  
                  if (params.isCategory) {
                      tickOffset = Math.ceil((scale1(1) - scale1(0)) / 2);
                      tickX = tickCentered ? 0 : tickOffset;
                      tickY = tickCentered ? tickOffset : 0;
                  } else {
                      tickOffset = tickX = 0;
                  }
  
                  var text, tspan, sizeFor1Char = getSizeFor1Char(g.select('.tick')), counts = [];
                  var tickLength = Math.max(innerTickSize, 0) + tickPadding,
                      isVertical = orient === 'left' || orient === 'right';
  
                  // this should be called only when category axis
                  function splitTickText(d, maxWidth) {
                      var tickText = textFormatted(d),
                          subtext, spaceIndex, textWidth, splitted = [];
  
                      if (Object.prototype.toString.call(tickText) === "[object Array]") {
                          return tickText;
                      }
  
                      if (!maxWidth || maxWidth <= 0) {
                          maxWidth = isVertical ? 95 : params.isCategory ? (Math.ceil(scale1(ticks[1]) - scale1(ticks[0])) - 12) : 110;
                      }
  
                      function split(splitted, text) {
                          spaceIndex = undefined;
                          for (var i = 1; i < text.length; i++) {
                              if (text.charAt(i) === ' ') {
                                  spaceIndex = i;
                              }
                              subtext = text.substr(0, i + 1);
                              textWidth = sizeFor1Char.w * subtext.length;
                              // if text width gets over tick width, split by space index or crrent index
                              if (maxWidth < textWidth) {
                                  return split(
                                      splitted.concat(text.substr(0, spaceIndex ? spaceIndex : i)),
                                      text.slice(spaceIndex ? spaceIndex + 1 : i)
                                  );
                              }
                          }
                          return splitted.concat(text);
                      }
  
                      return split(splitted, tickText + "");
                  }
  
                  function tspanDy(d, i) {
                      var dy = sizeFor1Char.h;
                      if (i === 0) {
                          if (orient === 'left' || orient === 'right') {
                              dy = -((counts[d.index] - 1) * (sizeFor1Char.h / 2) - 3);
                          } else {
                              dy = ".71em";
                          }
                      }
                      return dy;
                  }
  
                  function tickSize(d) {
                      var tickPosition = scale(d) + (tickCentered ? 0 : tickOffset);
                      return range[0] < tickPosition && tickPosition < range[1] ? innerTickSize : 0;
                  }
  
                  text = tick.select("text");
                  tspan = text.selectAll('tspan')
                      .data(function (d, i) {
                          var splitted = params.tickMultiline ? splitTickText(d, params.tickWidth) : [].concat(textFormatted(d));
                          counts[i] = splitted.length;
                          return splitted.map(function (s) {
                              return { index: i, splitted: s };
                          });
                      });
                  tspan.enter().append('tspan');
                  tspan.exit().remove();
                  tspan.text(function (d) { return d.splitted; });
  
                  switch (orient) {
                  case "bottom":
                      {
                          tickTransform = axisX;
                          lineEnter.attr("y2", innerTickSize);
                          textEnter.attr("y", tickLength);
                          lineUpdate.attr("x1", tickX).attr("x2", tickX).attr("y2", tickSize);
                          textUpdate.attr("x", 0).attr("y", tickLength);
                          text.style("text-anchor", "middle");
                          tspan.attr('x', 0).attr("dy", tspanDy);
                          pathUpdate.attr("d", "M" + range[0] + "," + outerTickSize + "V0H" + range[1] + "V" + outerTickSize);
                          break;
                      }
                  case "top":
                      {
                          tickTransform = axisX;
                          lineEnter.attr("y2", -innerTickSize);
                          textEnter.attr("y", -tickLength);
                          lineUpdate.attr("x2", 0).attr("y2", -innerTickSize);
                          textUpdate.attr("x", 0).attr("y", -tickLength);
                          text.style("text-anchor", "middle");
                          tspan.attr('x', 0).attr("dy", "0em");
                          pathUpdate.attr("d", "M" + range[0] + "," + -outerTickSize + "V0H" + range[1] + "V" + -outerTickSize);
                          break;
                      }
                  case "left":
                      {
                          tickTransform = axisY;
                          lineEnter.attr("x2", -innerTickSize);
                          textEnter.attr("x", -tickLength);
                          lineUpdate.attr("x2", -innerTickSize).attr("y1", tickY).attr("y2", tickY);
                          textUpdate.attr("x", -tickLength).attr("y", tickOffset);
                          text.style("text-anchor", "end");
                          tspan.attr('x', -tickLength).attr("dy", tspanDy);
                          pathUpdate.attr("d", "M" + -outerTickSize + "," + range[0] + "H0V" + range[1] + "H" + -outerTickSize);
                          break;
                      }
                  case "right":
                      {
                          tickTransform = axisY;
                          lineEnter.attr("x2", innerTickSize);
                          textEnter.attr("x", tickLength);
                          lineUpdate.attr("x2", innerTickSize).attr("y2", 0);
                          textUpdate.attr("x", tickLength).attr("y", 0);
                          text.style("text-anchor", "start");
                          tspan.attr('x', tickLength).attr("dy", tspanDy);
                          pathUpdate.attr("d", "M" + outerTickSize + "," + range[0] + "H0V" + range[1] + "H" + outerTickSize);
                          break;
                      }
                  }
                  if (scale1.rangeBand) {
                      var x = scale1, dx = x.rangeBand() / 2;
                      scale0 = scale1 = function (d) {
                          return x(d) + dx;
                      };
                  } else if (scale0.rangeBand) {
                      scale0 = scale1;
                  } else {
                      tickExit.call(tickTransform, scale1);
                  }
                  tickEnter.call(tickTransform, scale0);
                  tickUpdate.call(tickTransform, scale1);
              });
          }
          axis.scale = function (x) {
              if (!arguments.length) { return scale; }
              scale = x;
              return axis;
          };
          axis.orient = function (x) {
              if (!arguments.length) { return orient; }
              orient = x in {top: 1, right: 1, bottom: 1, left: 1} ? x + "" : "bottom";
              return axis;
          };
          axis.tickFormat = function (format) {
              if (!arguments.length) { return tickFormat; }
              tickFormat = format;
              return axis;
          };
          axis.tickCentered = function (isCentered) {
              if (!arguments.length) { return tickCentered; }
              tickCentered = isCentered;
              return axis;
          };
          axis.tickOffset = function () {
              return tickOffset;
          };
          axis.tickInterval = function () {
              var interval, length;
              if (params.isCategory) {
                  interval = tickOffset * 2;
              }
              else {
                  length = axis.g.select('path.domain').node().getTotalLength() - outerTickSize * 2;
                  interval = length / axis.g.selectAll('line').size();
              }
              return interval === Infinity ? 0 : interval;
          };
          axis.ticks = function () {
              if (!arguments.length) { return tickArguments; }
              tickArguments = arguments;
              return axis;
          };
          axis.tickCulling = function (culling) {
              if (!arguments.length) { return tickCulling; }
              tickCulling = culling;
              return axis;
          };
          axis.tickValues = function (x) {
              if (typeof x === 'function') {
                  tickValues = function () {
                      return x(scale.domain());
                  };
              }
              else {
                  if (!arguments.length) { return tickValues; }
                  tickValues = x;
              }
              return axis;
          };
          return axis;
      }
  
      // fix problems using c3 with phantomjs #578
      Function.prototype.bind = Function.prototype.bind || function (thisp) {
          var fn = this;
          return function () {
              return fn.apply(thisp, arguments);
          };
      };
  
      if (typeof define === 'function' && define.amd) {
          define("c3", ["d3"], c3);
      } else if ('undefined' !== typeof exports && 'undefined' !== typeof module) {
          module.exports = c3;
      } else {
          window.c3 = c3;
      }
  
  })(window);
  