text: import CLASS from './class';
  import { Component } from './core';
  import { isValue, isFunction, isString, isEmpty } from './util';
  
  export var c3_axis_fn;
  export var c3_axis_internal_fn;
  
  function AxisInternal(component, params) {
      var internal = this;
      internal.component = component;
      internal.params = params || {};
  
      internal.d3 = component.d3;
      internal.scale = internal.d3.scale.linear();
      internal.range;
      internal.orient = "bottom";
      internal.innerTickSize = 6;
      internal.outerTickSize = this.params.withOuterTick ? 6 : 0;
      internal.tickPadding = 3;
      internal.tickValues = null;
      internal.tickFormat;
      internal.tickArguments;
  
      internal.tickOffset = 0;
      internal.tickCulling = true;
      internal.tickCentered;
      internal.tickTextCharSize;
      internal.tickTextRotate = internal.params.tickTextRotate;
      internal.tickLength;
  
      internal.axis = internal.generateAxis();
  }
  c3_axis_internal_fn = AxisInternal.prototype;
  
  c3_axis_internal_fn.axisX = function (selection, x, tickOffset) {
      selection.attr("transform", function (d) {
          return "translate(" + Math.ceil(x(d) + tickOffset) + ", 0)";
      });
  };
  c3_axis_internal_fn.axisY = function (selection, y) {
      selection.attr("transform", function (d) {
          return "translate(0," + Math.ceil(y(d)) + ")";
      });
  };
  c3_axis_internal_fn.scaleExtent = function (domain) {
      var start = domain[0], stop = domain[domain.length - 1];
      return start < stop ? [ start, stop ] : [ stop, start ];
  };
  c3_axis_internal_fn.generateTicks = function (scale) {
      var internal = this;
      var i, domain, ticks = [];
      if (scale.ticks) {
          return scale.ticks.apply(scale, internal.tickArguments);
      }
      domain = scale.domain();
      for (i = Math.ceil(domain[0]); i < domain[1]; i++) {
          ticks.push(i);
      }
      if (ticks.length > 0 && ticks[0] > 0) {
          ticks.unshift(ticks[0] - (ticks[1] - ticks[0]));
      }
      return ticks;
  };
  c3_axis_internal_fn.copyScale = function () {
      var internal = this;
      var newScale = internal.scale.copy(), domain;
      if (internal.params.isCategory) {
          domain = internal.scale.domain();
          newScale.domain([domain[0], domain[1] - 1]);
      }
      return newScale;
  };
  c3_axis_internal_fn.textFormatted = function (v) {
      var internal = this,
          formatted = internal.tickFormat ? internal.tickFormat(v) : v;
      return typeof formatted !== 'undefined' ? formatted : '';
  };
  c3_axis_internal_fn.updateRange = function () {
      var internal = this;
      internal.range = internal.scale.rangeExtent ? internal.scale.rangeExtent() : internal.scaleExtent(internal.scale.range());
      return internal.range;
  };
  c3_axis_internal_fn.updateTickTextCharSize = function (tick) {
      var internal = this;
      if (internal.tickTextCharSize) {
          return internal.tickTextCharSize;
      }
      var size = {
          h: 11.5,
          w: 5.5
      };
      tick.select('text').text(function(d) { return internal.textFormatted(d); }).each(function (d) {
          var box = this.getBoundingClientRect(),
              text = internal.textFormatted(d),
              h = box.height,
              w = text ? (box.width / text.length) : undefined;
          if (h && w) {
              size.h = h;
              size.w = w;
          }
      }).text('');
      internal.tickTextCharSize = size;
      return size;
  };
  c3_axis_internal_fn.transitionise = function (selection) {
      return this.params.withoutTransition ? selection : this.d3.transition(selection);
  };
  c3_axis_internal_fn.isVertical = function () {
      return this.orient === 'left' || this.orient === 'right';
  };
  c3_axis_internal_fn.tspanData = function (d, i, ticks, scale) {
      var internal = this;
      var splitted = internal.params.tickMultiline ? internal.splitTickText(d, ticks, scale) : [].concat(internal.textFormatted(d));
  
      if (internal.params.tickMultiline && internal.params.tickMultilineMax > 0) {
          splitted = internal.ellipsify(splitted, internal.params.tickMultilineMax);
      }
  
      return splitted.map(function (s) {
          return { index: i, splitted: s, length: splitted.length };
      });
  };
  c3_axis_internal_fn.splitTickText = function (d, ticks, scale) {
      var internal = this,
          tickText = internal.textFormatted(d),
          maxWidth = internal.params.tickWidth,
          subtext, spaceIndex, textWidth, splitted = [];
  
      if (Object.prototype.toString.call(tickText) === "[object Array]") {
          return tickText;
      }
  
      if (!maxWidth || maxWidth <= 0) {
          maxWidth = internal.isVertical() ? 95 : internal.params.isCategory ? (Math.ceil(scale(ticks[1]) - scale(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 = internal.tickTextCharSize.w * subtext.length;
              // if text width gets over tick width, split by space index or crrent index
              if (maxWidth < textWidth) {
                  return split(
                      splitted.concat(text.substr(0, spaceIndex ? spaceIndex : i)),
                      text.slice(spaceIndex ? spaceIndex + 1 : i)
                  );
              }
          }
          return splitted.concat(text);
      }
  
      return split(splitted, tickText + "");
  };
  c3_axis_internal_fn.ellipsify = function(splitted, max) {
      if (splitted.length <= max) {
          return splitted;
      }
  
      var ellipsified = splitted.slice(0, max);
      var remaining = 3;
      for (var i = max-1 ; i >= 0 ; i--) {
          var available = ellipsified[i].length;
  
          ellipsified[i] = ellipsified[i].substr(0, available-remaining).padEnd(available, '.');
  
          remaining -= available;
  
          if (remaining <= 0) {
              break;
          }
      }
  
      return ellipsified;
  };
  c3_axis_internal_fn.updateTickLength = function () {
      var internal = this;
      internal.tickLength = Math.max(internal.innerTickSize, 0) + internal.tickPadding;
  };
  c3_axis_internal_fn.lineY2 = function (d) {
      var internal = this,
          tickPosition = internal.scale(d) + (internal.tickCentered ? 0 : internal.tickOffset);
      return internal.range[0] < tickPosition && tickPosition < internal.range[1] ? internal.innerTickSize : 0;
  };
  c3_axis_internal_fn.textY = function (){
      var internal = this, rotate = internal.tickTextRotate;
      return rotate ? 11.5 - 2.5 * (rotate / 15) * (rotate > 0 ? 1 : -1) : internal.tickLength;
  };
  c3_axis_internal_fn.textTransform = function () {
      var internal = this, rotate = internal.tickTextRotate;
      return rotate ? "rotate(" + rotate + ")" : "";
  };
  c3_axis_internal_fn.textTextAnchor = function () {
      var internal = this, rotate = internal.tickTextRotate;
      return rotate ? (rotate > 0 ? "start" : "end") : "middle";
  };
  c3_axis_internal_fn.tspanDx = function () {
      var internal = this, rotate = internal.tickTextRotate;
      return rotate ? 8 * Math.sin(Math.PI * (rotate / 180)) : 0;
  };
  c3_axis_internal_fn.tspanDy = function (d, i) {
      var internal = this,
          dy = internal.tickTextCharSize.h;
      if (i === 0) {
          if (internal.isVertical()) {
              dy = -((d.length - 1) * (internal.tickTextCharSize.h / 2) - 3);
          } else {
              dy = ".71em";
          }
      }
      return dy;
  };
  
  
  c3_axis_internal_fn.generateAxis = function () {
      var internal = this, d3 = internal.d3, params = internal.params;
      function axis(g) {
          g.each(function () {
              var g = axis.g = d3.select(this);
  
              var scale0 = this.__chart__ || internal.scale,
                  scale1 = this.__chart__ = internal.copyScale();
  
              var ticks = internal.tickValues ? internal.tickValues : internal.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 = internal.transitionise(tick).style("opacity", 1),
                  tickTransform, tickX, tickY;
  
              if (params.isCategory) {
                  internal.tickOffset = Math.ceil((scale1(1) - scale1(0)) / 2);
                  tickX = internal.tickCentered ? 0 : internal.tickOffset;
                  tickY = internal.tickCentered ? internal.tickOffset : 0;
              } else {
                  internal.tickOffset = tickX = 0;
              }
  
              tickEnter.append("line");
              tickEnter.append("text");
  
              internal.updateRange();
              internal.updateTickLength();
              internal.updateTickTextCharSize(g.select('.tick'));
  
              var lineUpdate = tickUpdate.select("line"),
                  textUpdate = tickUpdate.select("text"),
                  tspanUpdate = tick.select("text").selectAll('tspan')
                      .data(function (d, i) { return internal.tspanData(d, i, ticks, scale1); });
  
              tspanUpdate.enter().append('tspan');
              tspanUpdate.exit().remove();
              tspanUpdate.text(function (d) { return d.splitted; });
  
              var path = g.selectAll(".domain").data([ 0 ]),
                  pathUpdate = (path.enter().append("path").attr("class", "domain"), internal.transitionise(path));
  
              // TODO: each attr should be one function and change its behavior by internal.orient, probably
              switch (internal.orient) {
              case "bottom":
                  {
                      tickTransform = internal.axisX;
                      lineUpdate.attr("x1", tickX)
                          .attr("x2", tickX)
                          .attr("y2", function (d, i) { return internal.lineY2(d, i); });
                      textUpdate.attr("x", 0)
                          .attr("y", function (d, i) { return internal.textY(d, i); })
                          .attr("transform", function (d, i) { return internal.textTransform(d, i); })
                          .style("text-anchor", function (d, i) { return internal.textTextAnchor(d, i); });
                      tspanUpdate.attr('x', 0)
                          .attr("dy", function (d, i) { return internal.tspanDy(d, i); })
                          .attr('dx', function (d, i) { return internal.tspanDx(d, i); });
                      pathUpdate.attr("d", "M" + internal.range[0] + "," + internal.outerTickSize + "V0H" + internal.range[1] + "V" + internal.outerTickSize);
                      break;
                  }
              case "top":
                  {
                      // TODO: rotated tick text
                      tickTransform = internal.axisX;
                      lineUpdate.attr("x1", tickX)
                          .attr("x2", tickX)
                          .attr("y2", function (d, i) { return -1 * internal.lineY2(d, i); });
                      textUpdate.attr("x", 0)
                          .attr("y", function (d, i) { return -1 * internal.textY(d, i) - (params.isCategory ? 2 : (internal.tickLength - 2)); })
                          .attr("transform", function (d, i) { return internal.textTransform(d, i); })
                          .style("text-anchor", function (d, i) { return internal.textTextAnchor(d, i); });
                      tspanUpdate.attr('x', 0)
                          .attr("dy", function (d, i) { return internal.tspanDy(d, i); })
                          .attr('dx', function (d, i) { return internal.tspanDx(d, i); });
                      pathUpdate.attr("d", "M" + internal.range[0] + "," + -internal.outerTickSize + "V0H" + internal.range[1] + "V" + -internal.outerTickSize);
                      break;
                  }
              case "left":
                  {
                      tickTransform = internal.axisY;
                      lineUpdate.attr("x2", -internal.innerTickSize)
                          .attr("y1", tickY)
                          .attr("y2", tickY);
                      textUpdate.attr("x", -internal.tickLength)
                          .attr("y", internal.tickOffset)
                          .style("text-anchor", "end");
                      tspanUpdate.attr('x', -internal.tickLength)
                          .attr("dy", function (d, i) { return internal.tspanDy(d, i); });
                      pathUpdate.attr("d", "M" + -internal.outerTickSize + "," + internal.range[0] + "H0V" + internal.range[1] + "H" + -internal.outerTickSize);
                      break;
                  }
              case "right":
                  {
                      tickTransform = internal.axisY;
                      lineUpdate.attr("x2", internal.innerTickSize)
                          .attr("y1", tickY)
                          .attr("y2", tickY);
                      textUpdate.attr("x", internal.tickLength)
                          .attr("y", internal.tickOffset)
                          .style("text-anchor", "start");
                      tspanUpdate.attr('x', internal.tickLength)
                          .attr("dy", function (d, i) { return internal.tspanDy(d, i); });
                      pathUpdate.attr("d", "M" + internal.outerTickSize + "," + internal.range[0] + "H0V" + internal.range[1] + "H" + internal.outerTickSize);
                      break;
                  }
              }
              if (scale1.rangeBand) {
                  var x = scale1, dx = x.rangeBand() / 2;
                  scale0 = scale1 = function (d) {
                      return x(d) + dx;
                  };
              } else if (scale0.rangeBand) {
                  scale0 = scale1;
              } else {
                  tickExit.call(tickTransform, scale1, internal.tickOffset);
              }
              tickEnter.call(tickTransform, scale0, internal.tickOffset);
              tickUpdate.call(tickTransform, scale1, internal.tickOffset);
          });
      }
      axis.scale = function (x) {
          if (!arguments.length) { return internal.scale; }
          internal.scale = x;
          return axis;
      };
      axis.orient = function (x) {
          if (!arguments.length) { return internal.orient; }
          internal.orient = x in {top: 1, right: 1, bottom: 1, left: 1} ? x + "" : "bottom";
          return axis;
      };
      axis.tickFormat = function (format) {
          if (!arguments.length) { return internal.tickFormat; }
          internal.tickFormat = format;
          return axis;
      };
      axis.tickCentered = function (isCentered) {
          if (!arguments.length) { return internal.tickCentered; }
          internal.tickCentered = isCentered;
          return axis;
      };
      axis.tickOffset = function () {
          return internal.tickOffset;
      };
      axis.tickInterval = function () {
          var interval, length;
          if (params.isCategory) {
              interval = internal.tickOffset * 2;
          }
          else {
              length = axis.g.select('path.domain').node().getTotalLength() - internal.outerTickSize * 2;
              interval = length / axis.g.selectAll('line').size();
          }
          return interval === Infinity ? 0 : interval;
      };
      axis.ticks = function () {
          if (!arguments.length) { return internal.tickArguments; }
          internal.tickArguments = arguments;
          return axis;
      };
      axis.tickCulling = function (culling) {
          if (!arguments.length) { return internal.tickCulling; }
          internal.tickCulling = culling;
          return axis;
      };
      axis.tickValues = function (x) {
          if (typeof x === 'function') {
              internal.tickValues = function () {
                  return x(internal.scale.domain());
              };
          }
          else {
              if (!arguments.length) { return internal.tickValues; }
              internal.tickValues = x;
          }
          return axis;
      };
      return axis;
  };
  
  export default class Axis extends Component {
      constructor (owner) {
          var fn = {
              fn: c3_axis_fn,
              internal: {
                  fn: c3_axis_internal_fn
              }
          };
          super(owner, 'axis', fn);
          this.d3 = owner.d3;
          this.internal = AxisInternal;
      }
  }
  c3_axis_fn = Axis.prototype;
  
  c3_axis_fn.init = function init() {
      var $$ = this.owner, config = $$.config, main = $$.main;
      $$.axes.x = main.append("g")
          .attr("class", CLASS.axis + ' ' + CLASS.axisX)
          .attr("clip-path", config.axis_x_inner ? "" : $$.clipPathForXAxis)
          .attr("transform", $$.getTranslate('x'))
          .style("visibility", config.axis_x_show ? 'visible' : 'hidden');
      $$.axes.x.append("text")
          .attr("class", CLASS.axisXLabel)
          .attr("transform", config.axis_rotated ? "rotate(-90)" : "")
          .style("text-anchor", this.textAnchorForXAxisLabel.bind(this));
      $$.axes.y = main.append("g")
          .attr("class", CLASS.axis + ' ' + CLASS.axisY)
          .attr("clip-path", config.axis_y_inner ? "" : $$.clipPathForYAxis)
          .attr("transform", $$.getTranslate('y'))
          .style("visibility", config.axis_y_show ? 'visible' : 'hidden');
      $$.axes.y.append("text")
          .attr("class", CLASS.axisYLabel)
          .attr("transform", config.axis_rotated ? "" : "rotate(-90)")
          .style("text-anchor", this.textAnchorForYAxisLabel.bind(this));
  
      $$.axes.y2 = main.append("g")
          .attr("class", CLASS.axis + ' ' + CLASS.axisY2)
          // clip-path?
          .attr("transform", $$.getTranslate('y2'))
          .style("visibility", config.axis_y2_show ? 'visible' : 'hidden');
      $$.axes.y2.append("text")
          .attr("class", CLASS.axisY2Label)
          .attr("transform", config.axis_rotated ? "" : "rotate(-90)")
          .style("text-anchor", this.textAnchorForY2AxisLabel.bind(this));
  };
  c3_axis_fn.getXAxis = function getXAxis(scale, orient, tickFormat, tickValues, withOuterTick, withoutTransition, withoutRotateTickText) {
      var $$ = this.owner, config = $$.config,
          axisParams = {
              isCategory: $$.isCategorized(),
              withOuterTick: withOuterTick,
              tickMultiline: config.axis_x_tick_multiline,
              tickMultilineMax: config.axis_x_tick_multiline ? Number(config.axis_x_tick_multilineMax) : 0,
              tickWidth: config.axis_x_tick_width,
              tickTextRotate: withoutRotateTickText ? 0 : config.axis_x_tick_rotate,
              withoutTransition: withoutTransition,
          },
          axis = new this.internal(this, axisParams).axis.scale(scale).orient(orient);
  
      if ($$.isTimeSeries() && tickValues && typeof tickValues !== "function") {
          tickValues = tickValues.map(function (v) { return $$.parseDate(v); });
      }
  
      // Set tick
      axis.tickFormat(tickFormat).tickValues(tickValues);
      if ($$.isCategorized()) {
          axis.tickCentered(config.axis_x_tick_centered);
          if (isEmpty(config.axis_x_tick_culling)) {
              config.axis_x_tick_culling = false;
          }
      }
  
      return axis;
  };
  c3_axis_fn.updateXAxisTickValues = function updateXAxisTickValues(targets, axis) {
      var $$ = this.owner, config = $$.config, tickValues;
      if (config.axis_x_tick_fit || config.axis_x_tick_count) {
          tickValues = this.generateTickValues($$.mapTargetsToUniqueXs(targets), config.axis_x_tick_count, $$.isTimeSeries());
      }
      if (axis) {
          axis.tickValues(tickValues);
      } else {
          $$.xAxis.tickValues(tickValues);
          $$.subXAxis.tickValues(tickValues);
      }
      return tickValues;
  };
  c3_axis_fn.getYAxis = function getYAxis(scale, orient, tickFormat, tickValues, withOuterTick, withoutTransition, withoutRotateTickText) {
      var $$ = this.owner, config = $$.config,
          axisParams = {
              withOuterTick: withOuterTick,
              withoutTransition: withoutTransition,
              tickTextRotate: withoutRotateTickText ? 0 : config.axis_y_tick_rotate
          },
          axis = new this.internal(this, axisParams).axis.scale(scale).orient(orient).tickFormat(tickFormat);
      if ($$.isTimeSeriesY()) {
          axis.ticks($$.d3.time[config.axis_y_tick_time_value], config.axis_y_tick_time_interval);
      } else {
          axis.tickValues(tickValues);
      }
      return axis;
  };
  c3_axis_fn.getId = function getId(id) {
      var config = this.owner.config;
      return id in config.data_axes ? config.data_axes[id] : 'y';
  };
  c3_axis_fn.getXAxisTickFormat = function getXAxisTickFormat() {
      var $$ = this.owner, config = $$.config,
          format = $$.isTimeSeries() ? $$.defaultAxisTimeFormat : $$.isCategorized() ? $$.categoryName : function (v) { return v < 0 ? v.toFixed(0) : v; };
      if (config.axis_x_tick_format) {
          if (isFunction(config.axis_x_tick_format)) {
              format = config.axis_x_tick_format;
          } else if ($$.isTimeSeries()) {
              format = function (date) {
                  return date ? $$.axisTimeFormat(config.axis_x_tick_format)(date) : "";
              };
          }
      }
      return isFunction(format) ? function (v) { return format.call($$, v); } : format;
  };
  c3_axis_fn.getTickValues = function getTickValues(tickValues, axis) {
      return tickValues ? tickValues : axis ? axis.tickValues() : undefined;
  };
  c3_axis_fn.getXAxisTickValues = function getXAxisTickValues() {
      return this.getTickValues(this.owner.config.axis_x_tick_values, this.owner.xAxis);
  };
  c3_axis_fn.getYAxisTickValues = function getYAxisTickValues() {
      return this.getTickValues(this.owner.config.axis_y_tick_values, this.owner.yAxis);
  };
  c3_axis_fn.getY2AxisTickValues = function getY2AxisTickValues() {
      return this.getTickValues(this.owner.config.axis_y2_tick_values, this.owner.y2Axis);
  };
  c3_axis_fn.getLabelOptionByAxisId = function getLabelOptionByAxisId(axisId) {
      var $$ = this.owner, config = $$.config, option;
      if (axisId === 'y') {
          option = config.axis_y_label;
      } else if (axisId === 'y2') {
          option = config.axis_y2_label;
      } else if (axisId === 'x') {
          option = config.axis_x_label;
      }
      return option;
  };
  c3_axis_fn.getLabelText = function getLabelText(axisId) {
      var option = this.getLabelOptionByAxisId(axisId);
      return isString(option) ? option : option ? option.text : null;
  };
  c3_axis_fn.setLabelText = function setLabelText(axisId, text) {
      var $$ = this.owner, config = $$.config,
          option = this.getLabelOptionByAxisId(axisId);
      if (isString(option)) {
          if (axisId === 'y') {
              config.axis_y_label = text;
          } else if (axisId === 'y2') {
              config.axis_y2_label = text;
          } else if (axisId === 'x') {
              config.axis_x_label = text;
          }
      } else if (option) {
          option.text = text;
      }
  };
  c3_axis_fn.getLabelPosition = function getLabelPosition(axisId, defaultPosition) {
      var option = this.getLabelOptionByAxisId(axisId),
          position = (option && typeof option === 'object' && option.position) ? option.position : defaultPosition;
      return {
          isInner: position.indexOf('inner') >= 0,
          isOuter: position.indexOf('outer') >= 0,
          isLeft: position.indexOf('left') >= 0,
          isCenter: position.indexOf('center') >= 0,
          isRight: position.indexOf('right') >= 0,
          isTop: position.indexOf('top') >= 0,
          isMiddle: position.indexOf('middle') >= 0,
          isBottom: position.indexOf('bottom') >= 0
      };
  };
  c3_axis_fn.getXAxisLabelPosition = function getXAxisLabelPosition() {
      return this.getLabelPosition('x', this.owner.config.axis_rotated ? 'inner-top' : 'inner-right');
  };
  c3_axis_fn.getYAxisLabelPosition = function getYAxisLabelPosition() {
      return this.getLabelPosition('y', this.owner.config.axis_rotated ? 'inner-right' : 'inner-top');
  };
  c3_axis_fn.getY2AxisLabelPosition = function getY2AxisLabelPosition() {
      return this.getLabelPosition('y2', this.owner.config.axis_rotated ? 'inner-right' : 'inner-top');
  };
  c3_axis_fn.getLabelPositionById = function getLabelPositionById(id) {
      return id === 'y2' ? this.getY2AxisLabelPosition() : id === 'y' ? this.getYAxisLabelPosition() : this.getXAxisLabelPosition();
  };
  c3_axis_fn.textForXAxisLabel = function textForXAxisLabel() {
      return this.getLabelText('x');
  };
  c3_axis_fn.textForYAxisLabel = function textForYAxisLabel() {
      return this.getLabelText('y');
  };
  c3_axis_fn.textForY2AxisLabel = function textForY2AxisLabel() {
      return this.getLabelText('y2');
  };
  c3_axis_fn.xForAxisLabel = function xForAxisLabel(forHorizontal, position) {
      var $$ = this.owner;
      if (forHorizontal) {
          return position.isLeft ? 0 : position.isCenter ? $$.width / 2 : $$.width;
      } else {
          return position.isBottom ? -$$.height : position.isMiddle ? -$$.height / 2 : 0;
      }
  };
  c3_axis_fn.dxForAxisLabel = function dxForAxisLabel(forHorizontal, position) {
      if (forHorizontal) {
          return position.isLeft ? "0.5em" : position.isRight ? "-0.5em" : "0";
      } else {
          return position.isTop ? "-0.5em" : position.isBottom ? "0.5em" : "0";
      }
  };
  c3_axis_fn.textAnchorForAxisLabel = function textAnchorForAxisLabel(forHorizontal, position) {
      if (forHorizontal) {
          return position.isLeft ? 'start' : position.isCenter ? 'middle' : 'end';
      } else {
          return position.isBottom ? 'start' : position.isMiddle ? 'middle' : 'end';
      }
  };
  c3_axis_fn.xForXAxisLabel = function xForXAxisLabel() {
      return this.xForAxisLabel(!this.owner.config.axis_rotated, this.getXAxisLabelPosition());
  };
  c3_axis_fn.xForYAxisLabel = function xForYAxisLabel() {
      return this.xForAxisLabel(this.owner.config.axis_rotated, this.getYAxisLabelPosition());
  };
  c3_axis_fn.xForY2AxisLabel = function xForY2AxisLabel() {
      return this.xForAxisLabel(this.owner.config.axis_rotated, this.getY2AxisLabelPosition());
  };
  c3_axis_fn.dxForXAxisLabel = function dxForXAxisLabel() {
      return this.dxForAxisLabel(!this.owner.config.axis_rotated, this.getXAxisLabelPosition());
  };
  c3_axis_fn.dxForYAxisLabel = function dxForYAxisLabel() {
      return this.dxForAxisLabel(this.owner.config.axis_rotated, this.getYAxisLabelPosition());
  };
  c3_axis_fn.dxForY2AxisLabel = function dxForY2AxisLabel() {
      return this.dxForAxisLabel(this.owner.config.axis_rotated, this.getY2AxisLabelPosition());
  };
  c3_axis_fn.dyForXAxisLabel = function dyForXAxisLabel() {
      var $$ = this.owner, config = $$.config,
          position = this.getXAxisLabelPosition();
      if (config.axis_rotated) {
          return position.isInner ? "1.2em" : -25 - ($$.config.axis_x_inner ? 0 : this.getMaxTickWidth('x'));
      } else {
          return position.isInner ? "-0.5em" : config.axis_x_height ? config.axis_x_height - 10 : "3em";
      }
  };
  c3_axis_fn.dyForYAxisLabel = function dyForYAxisLabel() {
      var $$ = this.owner,
          position = this.getYAxisLabelPosition();
      if ($$.config.axis_rotated) {
          return position.isInner ? "-0.5em" : "3em";
      } else {
          return position.isInner ? "1.2em" : -10 - ($$.config.axis_y_inner ? 0 : (this.getMaxTickWidth('y') + 10));
      }
  };
  c3_axis_fn.dyForY2AxisLabel = function dyForY2AxisLabel() {
      var $$ = this.owner,
          position = this.getY2AxisLabelPosition();
      if ($$.config.axis_rotated) {
          return position.isInner ? "1.2em" : "-2.2em";
      } else {
          return position.isInner ? "-0.5em" : 15 + ($$.config.axis_y2_inner ? 0 : (this.getMaxTickWidth('y2') + 15));
      }
  };
  c3_axis_fn.textAnchorForXAxisLabel = function textAnchorForXAxisLabel() {
      var $$ = this.owner;
      return this.textAnchorForAxisLabel(!$$.config.axis_rotated, this.getXAxisLabelPosition());
  };
  c3_axis_fn.textAnchorForYAxisLabel = function textAnchorForYAxisLabel() {
      var $$ = this.owner;
      return this.textAnchorForAxisLabel($$.config.axis_rotated, this.getYAxisLabelPosition());
  };
  c3_axis_fn.textAnchorForY2AxisLabel = function textAnchorForY2AxisLabel() {
      var $$ = this.owner;
      return this.textAnchorForAxisLabel($$.config.axis_rotated, this.getY2AxisLabelPosition());
  };
  c3_axis_fn.getMaxTickWidth = function getMaxTickWidth(id, withoutRecompute) {
      var $$ = this.owner, config = $$.config,
          maxWidth = 0, targetsToShow, scale, axis, dummy, svg;
      if (withoutRecompute && $$.currentMaxTickWidths[id]) {
          return $$.currentMaxTickWidths[id];
      }
      if ($$.svg) {
          targetsToShow = $$.filterTargetsToShow($$.data.targets);
          if (id === 'y') {
              scale = $$.y.copy().domain($$.getYDomain(targetsToShow, 'y'));
              axis = this.getYAxis(scale, $$.yOrient, config.axis_y_tick_format, $$.yAxisTickValues, false, true, true);
          } else if (id === 'y2') {
              scale = $$.y2.copy().domain($$.getYDomain(targetsToShow, 'y2'));
              axis = this.getYAxis(scale, $$.y2Orient, config.axis_y2_tick_format, $$.y2AxisTickValues, false, true, true);
          } else {
              scale = $$.x.copy().domain($$.getXDomain(targetsToShow));
              axis = this.getXAxis(scale, $$.xOrient, $$.xAxisTickFormat, $$.xAxisTickValues, false, true, true);
              this.updateXAxisTickValues(targetsToShow, axis);
          }
          dummy = $$.d3.select('body').append('div').classed('c3', true);
          svg = dummy.append("svg").style('visibility', 'hidden').style('position', 'fixed').style('top', 0).style('left', 0),
          svg.append('g').call(axis).each(function () {
              $$.d3.select(this).selectAll('text').each(function () {
                  var box = this.getBoundingClientRect();
                  if (maxWidth < box.width) { maxWidth = box.width; }
              });
              dummy.remove();
          });
      }
      $$.currentMaxTickWidths[id] = maxWidth <= 0 ? $$.currentMaxTickWidths[id] : maxWidth;
      return $$.currentMaxTickWidths[id];
  };
  
  c3_axis_fn.updateLabels = function updateLabels(withTransition) {
      var $$ = this.owner;
      var axisXLabel = $$.main.select('.' + CLASS.axisX + ' .' + CLASS.axisXLabel),
          axisYLabel = $$.main.select('.' + CLASS.axisY + ' .' + CLASS.axisYLabel),
          axisY2Label = $$.main.select('.' + CLASS.axisY2 + ' .' + CLASS.axisY2Label);
      (withTransition ? axisXLabel.transition() : axisXLabel)
          .attr("x", this.xForXAxisLabel.bind(this))
          .attr("dx", this.dxForXAxisLabel.bind(this))
          .attr("dy", this.dyForXAxisLabel.bind(this))
          .text(this.textForXAxisLabel.bind(this));
      (withTransition ? axisYLabel.transition() : axisYLabel)
          .attr("x", this.xForYAxisLabel.bind(this))
          .attr("dx", this.dxForYAxisLabel.bind(this))
          .attr("dy", this.dyForYAxisLabel.bind(this))
          .text(this.textForYAxisLabel.bind(this));
      (withTransition ? axisY2Label.transition() : axisY2Label)
          .attr("x", this.xForY2AxisLabel.bind(this))
          .attr("dx", this.dxForY2AxisLabel.bind(this))
          .attr("dy", this.dyForY2AxisLabel.bind(this))
          .text(this.textForY2AxisLabel.bind(this));
  };
  c3_axis_fn.getPadding = function getPadding(padding, key, defaultValue, domainLength) {
      var p = typeof padding === 'number' ? padding : padding[key];
      if (!isValue(p)) {
          return defaultValue;
      }
      if (padding.unit === 'ratio') {
          return padding[key] * domainLength;
      }
      // assume padding is pixels if unit is not specified
      return this.convertPixelsToAxisPadding(p, domainLength);
  };
  c3_axis_fn.convertPixelsToAxisPadding = function convertPixelsToAxisPadding(pixels, domainLength) {
      var $$ = this.owner,
          length = $$.config.axis_rotated ? $$.width : $$.height;
      return domainLength * (pixels / length);
  };
  c3_axis_fn.generateTickValues = function generateTickValues(values, tickCount, forTimeSeries) {
      var tickValues = values, targetCount, start, end, count, interval, i, tickValue;
      if (tickCount) {
          targetCount = isFunction(tickCount) ? tickCount() : tickCount;
          // compute ticks according to tickCount
          if (targetCount === 1) {
              tickValues = [values[0]];
          } else if (targetCount === 2) {
              tickValues = [values[0], values[values.length - 1]];
          } else if (targetCount > 2) {
              count = targetCount - 2;
              start = values[0];
              end = values[values.length - 1];
              interval = (end - start) / (count + 1);
              // re-construct unique values
              tickValues = [start];
              for (i = 0; i < count; i++) {
                  tickValue = +start + interval * (i + 1);
                  tickValues.push(forTimeSeries ? new Date(tickValue) : tickValue);
              }
              tickValues.push(end);
          }
      }
      if (!forTimeSeries) { tickValues = tickValues.sort(function (a, b) { return a - b; }); }
      return tickValues;
  };
  c3_axis_fn.generateTransitions = function generateTransitions(duration) {
      var $$ = this.owner, axes = $$.axes;
      return {
          axisX: duration ? axes.x.transition().duration(duration) : axes.x,
          axisY: duration ? axes.y.transition().duration(duration) : axes.y,
          axisY2: duration ? axes.y2.transition().duration(duration) : axes.y2,
          axisSubX: duration ? axes.subx.transition().duration(duration) : axes.subx
      };
  };
  c3_axis_fn.redraw = function redraw(transitions, isHidden) {
      var $$ = this.owner;
      $$.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);
  };
  