EVOLUTION-NINJA

Edit File: xcharts.js

/*!
xCharts v0.3.0 Copyright (c) 2012, tenXer, Inc. All Rights Reserved.
@license MIT license. http://github.com/tenXer/xcharts for details
*/

(function () {

var xChart,
  _vis = {},
  _scales = {},
  _visutils = {};
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  return _.chain(_.range(zIndex, 10)).reverse().map(function (z) {
    return 'g[data-index="' + z + '"]';
  }).value().join(', ');
}

function colorClass(el, i) {
  var c = el.getAttribute('class');
  return ((c !== null) ? c.replace(/color\d+/g, '') : '') + ' color' + i;
}

_visutils = {
  getInsertionPoint: getInsertionPoint,
  colorClass: colorClass
};
var local = this,
  defaultSpacing = 0.25;

function _getDomain(data, axis) {
  return _.chain(data)
    .pluck('data')
    .flatten()
    .pluck(axis)
    .uniq()
    .filter(function (d) {
      return d !== undefined && d !== null;
    })
    .value()
    .sort(d3.ascending);
}

_scales.ordinal = function (data, axis, bounds, extents) {
  var domain = _getDomain(data, axis);
  return d3.scale.ordinal()
    .domain(domain)
    .rangeRoundBands(bounds, defaultSpacing);
};

_scales.linear = function (data, axis, bounds, extents) {
  return d3.scale.linear()
    .domain(extents)
    .nice()
    .rangeRound(bounds);
};

_scales.exponential = function (data, axis, bounds, extents) {
  return d3.scale.pow()
    .exponent(0.65)
    .domain(extents)
    .nice()
    .rangeRound(bounds);
};

_scales.time = function (data, axis, bounds, extents) {
  return d3.time.scale()
    .domain(_.map(extents, function (d) { return new Date(d); }))
    .range(bounds);
};

function _extendDomain(domain, axis) {
  var min = domain[0],
    max = domain[1],
    diff,
    e;

if (min === max) {
    e = Math.max(Math.round(min / 10), 4);
    min -= e;
    max += e;
  }

diff = max - min;
  min = (min) ? min - (diff / 10) : min;
  min = (domain[0] > 0) ? Math.max(min, 0) : min;
  max = (max) ? max + (diff / 10) : max;
  max = (domain[1] < 0) ? Math.min(max, 0) : max;

return [min, max];
}

function _getExtents(options, data, xType, yType) {
  var extents,
    nData = _.chain(data)
      .pluck('data')
      .flatten()
      .value();

extents = {
    x: d3.extent(nData, function (d) { return d.x; }),
    y: d3.extent(nData, function (d) { return d.y; })
  };

_.each([xType, yType], function (type, i) {
    var axis = (i) ? 'y' : 'x',
      extended;
    extents[axis] = d3.extent(nData, function (d) { return d[axis]; });
    if (type === 'ordinal') {
      return;
    }

_.each([axis + 'Min', axis + 'Max'], function (minMax, i) {
      if (type !== 'time') {
        extended = _extendDomain(extents[axis]);
      }

if (options.hasOwnProperty(minMax) && options[minMax] !== null) {
        extents[axis][i] = options[minMax];
      } else if (type !== 'time') {
        extents[axis][i] = extended[i];
      }
    });
  });

return extents;
}

_scales.xy = function (self, data, xType, yType) {
  var o = self._options,
    extents = _getExtents(o, data, xType, yType),
    scales = {},
    horiz = [o.axisPaddingLeft, self._width],
    vert = [self._height, o.axisPaddingTop],
    xScale,
    yScale;

_.each([xType, yType], function (type, i) {
    var axis = (i === 0) ? 'x' : 'y',
      bounds = (i === 0) ? horiz : vert,
      fn = xChart.getScale(type);
    scales[axis] = fn(data, axis, bounds, extents[axis]);
  });

return scales;
};
(function () {
  var zIndex = 2,
    selector = 'g.bar',
    insertBefore = _visutils.getInsertionPoint(zIndex);

function postUpdateScale(self, scaleData, mainData, compData) {
    self.xScale2 = d3.scale.ordinal()
      .domain(d3.range(0, mainData.length))
      .rangeRoundBands([0, self.xScale.rangeBand()], 0.08);
  }

function enter(self, storage, className, data, callbacks) {
    var barGroups, bars,
      yZero = self.yZero;

barGroups = self._g.selectAll(selector + className)
      .data(data, function (d) {
        return d.className;
      });

barGroups.enter().insert('g', insertBefore)
      .attr('data-index', zIndex)
      .style('opacity', 0)
      .attr('class', function (d, i) {
        var cl = _.uniq((className + d.className).split('.')).join(' ');
        return cl + ' bar ' + _visutils.colorClass(this, i);
      })
      .attr('transform', function (d, i) {
        return 'translate(' + self.xScale2(i) + ',0)';
      });

bars = barGroups.selectAll('rect')
      .data(function (d) {
        return d.data;
      }, function (d) {
        return d.x;
      });

bars.enter().append('rect')
      .attr('width', 0)
      .attr('rx', 3)
      .attr('ry', 3)
      .attr('x', function (d) {
        return self.xScale(d.x) + (self.xScale2.rangeBand() / 2);
      })
      .attr('height', function (d) {
        return Math.abs(yZero - self.yScale(d.y));
      })
      .attr('y', function (d) {
        return (d.y < 0) ? yZero : self.yScale(d.y);
      })
      .on('mouseover', callbacks.mouseover)
      .on('mouseout', callbacks.mouseout)
      .on('click', callbacks.click);

storage.barGroups = barGroups;
    storage.bars = bars;
  }

function update(self, storage, timing) {
    var yZero = self.yZero;

storage.barGroups
      .attr('class', function (d, i) {
        return _visutils.colorClass(this, i);
      })
      .transition().duration(timing)
      .style('opacity', 1)
      .attr('transform', function (d, i) {
        return 'translate(' + self.xScale2(i) + ',0)';
      });

storage.bars.transition().duration(timing)
      .attr('width', self.xScale2.rangeBand())
      .attr('x', function (d) {
        return self.xScale(d.x);
      })
      .attr('height', function (d) {
        return Math.abs(yZero - self.yScale(d.y));
      })
      .attr('y', function (d) {
        return (d.y < 0) ? yZero : self.yScale(d.y);
      });
  }

function exit(self, storage, timing) {
    storage.bars.exit()
      .transition().duration(timing)
      .attr('width', 0)
      .remove();
    storage.barGroups.exit()
      .transition().duration(timing)
      .style('opacity', 0)
      .remove();
  }

function destroy(self, storage, timing) {
    var band = (self.xScale2) ? self.xScale2.rangeBand() / 2 : 0;
    delete self.xScale2;
    storage.bars
      .transition().duration(timing)
      .attr('width', 0)
      .attr('x', function (d) {
        return self.xScale(d.x) + band;
      });
  }

_vis.bar = {
    postUpdateScale: postUpdateScale,
    enter: enter,
    update: update,
    exit: exit,
    destroy: destroy
  };
}());
(function () {

var zIndex = 3,
    selector = 'g.line',
    insertBefore = _visutils.getInsertionPoint(zIndex);

function datum(d) {
      return [d.data];
    }

container = self._g.selectAll(selector + className)
      .data(data, function (d) {
        return d.className;
      });

container.enter().insert('g', insertBefore)
      .attr('data-index', zIndex)
      .attr('class', function (d, i) {
        var cl = _.uniq((className + d.className).split('.')).join(' ');
        return cl + ' line ' + _visutils.colorClass(this, i);
      });

fills = container.selectAll('path.fill')
      .data(datum);

fills.enter().append('path')
      .attr('class', 'fill')
      .style('opacity', 0)
      .attr('d', area.y0(y));

paths = container.selectAll('path.line')
      .data(datum);

paths.enter().append('path')
      .attr('class', 'line')
      .style('opacity', 0)
      .attr('d', line.y(y));

storage.lineContainers = container;
    storage.lineFills = fills;
    storage.linePaths = paths;
    storage.lineX = x;
    storage.lineY = y;
    storage.lineA = area;
    storage.line = line;
  }

function update(self, storage, timing) {
    storage.lineContainers
      .attr('class', function (d, i) {
        return _visutils.colorClass(this, i);
      });

storage.lineFills.transition().duration(timing)
      .style('opacity', 1)
      .attr('d', storage.lineA.y0(storage.lineY));

storage.linePaths.transition().duration(timing)
      .style('opacity', 1)
      .attr('d', storage.line.y(storage.lineY));
  }

function exit(self, storage) {
    storage.linePaths.exit()
      .style('opacity', 0)
      .remove();
    storage.lineFills.exit()
      .style('opacity', 0)
      .remove();

storage.lineContainers.exit()
      .remove();
  }

function destroy(self, storage, timing) {
    storage.linePaths.transition().duration(timing)
      .style('opacity', 0);
    storage.lineFills.transition().duration(timing)
      .style('opacity', 0);
  }

_vis.line = {
    enter: enter,
    update: update,
    exit: exit,
    destroy: destroy
  };
}());
(function () {
  var line = _vis.line;

function enter(self, storage, className, data, callbacks) {
    var circles;

line.enter(self, storage, className, data, callbacks);

circles = storage.lineContainers.selectAll('circle')
      .data(function (d) {
        return d.data;
      }, function (d) {
        return d.x;
      });

circles.enter().append('circle')
      .style('opacity', 0)
      .attr('cx', storage.lineX)
      .attr('cy', storage.lineY)
      .attr('r', 5)
      .on('mouseover', callbacks.mouseover)
      .on('mouseout', callbacks.mouseout)
      .on('click', callbacks.click);

storage.lineCircles = circles;
  }

function update(self, storage, timing) {
    line.update.apply(null, _.toArray(arguments));

storage.lineCircles.transition().duration(timing)
      .style('opacity', 1)
      .attr('cx', storage.lineX)
      .attr('cy', storage.lineY);
  }

function exit(self, storage) {
    storage.lineCircles.exit()
      .remove();
    line.exit.apply(null, _.toArray(arguments));
  }

function destroy(self, storage, timing) {
    line.destroy.apply(null, _.toArray(arguments));
    if (!storage.lineCircles) {
      return;
    }
    storage.lineCircles.transition().duration(timing)
      .style('opacity', 0);
  }

_vis['line-dotted'] = {
    enter: enter,
    update: update,
    exit: exit,
    destroy: destroy
  };
}());
(function () {
  var line = _vis['line-dotted'];

function enter(self, storage, className, data, callbacks) {
    line.enter(self, storage, className, data, callbacks);
  }

function _accumulate_data(data) {
    function reduce(memo, num) {
      return memo + num.y;
    }

return nData;
  }

function _resetData(self) {
    if (!self.hasOwnProperty('cumulativeOMainData')) {
      return;
    }
    self._mainData = self.cumulativeOMainData;
    delete self.cumulativeOMainData;
    self._compData = self.cumulativeOCompData;
    delete self.cumulativeOCompData;
  }

function preUpdateScale(self, data) {
    _resetData(self);
    self.cumulativeOMainData = self._mainData;
    self._mainData = _accumulate_data(self._mainData);
    self.cumulativeOCompData = self._compData;
    self._compData = _accumulate_data(self._compData);
  }

function destroy(self, storage, timing) {
    _resetData(self);
    line.destroy.apply(null, _.toArray(arguments));
  }

_vis.cumulative = {
    preUpdateScale: preUpdateScale,
    enter: enter,
    update: line.update,
    exit: line.exit,
    destroy: destroy
  };
}());
var emptyData = [[]],
  defaults = {
    // User interaction callbacks
    mouseover: function (data, i) {},
    mouseout: function (data, i) {},
    click: function (data, i) {},

// Padding between the axes and the contents of the chart
    axisPaddingTop: 0,
    axisPaddingRight: 0,
    axisPaddingBottom: 5,
    axisPaddingLeft: 20,

// Padding around the edge of the chart (space for axis labels, etc)
    paddingTop: 0,
    paddingRight: 0,
    paddingBottom: 20,
    paddingLeft: 60,

// Axis tick formatting
    tickHintX: 10,
    tickFormatX: function (x) { return x; },
    tickHintY: 10,
    tickFormatY: function (y) { return y; },

// Min/Max Axis Values
    xMin: null,
    xMax: null,
    yMin: null,
    yMax: null,

// Pre-format input data
    dataFormatX: function (x) { return x; },
    dataFormatY: function (y) { return y; },

unsupported: function (selector) {
      d3.select(selector).text('SVG is not supported on your browser');
    },

// Callback functions if no data
    empty: function (self, selector, d) {},
    notempty: function (self, selector) {},

timing: 750,

// Line interpolation
    interpolation: 'monotone',

// Data sorting
    sortX: function (a, b) {
      return (!a.x && !b.x) ? 0 : (a.x < b.x) ? -1 : 1;
    }
  };

// What/how should the warning/error be presented?
function svgEnabled() {
  var d = document;
  return (!!d.createElementNS &&
    !!d.createElementNS('http://www.w3.org/2000/svg', 'svg').createSVGRect);
}

/**
 * Creates a new chart
 *
 * @param string type       The drawing type for the main data
 * @param array data        Data to render in the chart
 * @param string selector   CSS Selector for the parent element for the chart
 * @param object options    Optional. See `defaults` for options
 *
 * Examples:
 *    var data = {
 *        "main": [
 *          {
 *            "data": [
 *              {
 *                "x": "2012-08-09T07:00:00.522Z",
 *                "y": 68
 *              },
 *              {
 *                "x": "2012-08-10T07:00:00.522Z",
 *                "y": 295
 *              },
 *              {
 *                "x": "2012-08-11T07:00:00.522Z",
 *                "y": 339
 *              },
 *            ],
 *            "className": ".foo"
 *          }
 *        ],
 *        "xScale": "ordinal",
 *        "yScale": "linear",
 *        "comp": [
 *          {
 *            "data": [
 *              {
 *                "x": "2012-08-09T07:00:00.522Z",
 *                "y": 288
 *              },
 *              {
 *                "x": "2012-08-10T07:00:00.522Z",
 *                "y": 407
 *              },
 *              {
 *                "x": "2012-08-11T07:00:00.522Z",
 *                "y": 459
 *              }
 *            ],
 *            "className": ".comp.comp_foo",
 *            "type": "line-arrowed"
 *          }
 *        ]
 *      },
 *      myChart = new Chart('bar', data, '#chart');
 *
 */
function xChart(type, data, selector, options) {
  var self = this,
    resizeLock;

self._options = options = _.defaults(options || {}, defaults);

if (svgEnabled() === false) {
    return options.unsupported(selector);
  }

self._selector = selector;
  self._container = d3.select(selector);
  self._drawSvg();
  self._mainStorage = {};
  self._compStorage = {};

data = _.clone(data);
  if (type && !data.type) {
    data.type = type;
  }

self.setData(data);

d3.select(window).on('resize.for.' + selector, function () {
    if (resizeLock) {
      clearTimeout(resizeLock);
    }
    resizeLock = setTimeout(function () {
      resizeLock = null;
      self._resize();
    }, 500);
  });
}

/**
 * Add a visualization type
 *
 * @param string type   Unique key/name used with setType
 * @param object vis    object map of vis methods
 */
xChart.setVis = function (type, vis) {
  if (_vis.hasOwnProperty(type)) {
    throw 'Cannot override vis type "' + type + '".';
  }
  _vis[type] = vis;
};

/**
 * Get a clone of a visualization
 * Useful for extending vis functionality
 *
 * @param string type   Unique key/name of the vis
 */
xChart.getVis = function (type) {
  if (!_vis.hasOwnProperty(type)) {
    throw 'Vis type "' + type + '" does not exist.';
  }

return _.clone(_vis[type]);
};

xChart.setScale = function (name, fn) {
  if (_scales.hasOwnProperty(name)) {
    throw 'Scale type "' + name + '" already exists.';
  }

_scales[name] = fn;
};

xChart.getScale = function (name) {
  if (!_scales.hasOwnProperty(name)) {
    throw 'Scale type "' + name + '" does not exist.';
  }
  return _scales[name];
};

xChart.visutils = _visutils;

_.defaults(xChart.prototype, {
  /**
   * Set or change the drawing type for the main data.
   *
   * @param string type   Must be an available drawing type
   *
   */
  setType: function (type, skipDraw) {
    var self = this;

if (self._type && type === self._type) {
      return;
    }

if (!_vis.hasOwnProperty(type)) {
      throw 'Vis type "' + type + '" is not defined.';
    }

if (self._type) {
      self._destroy(self._vis, self._mainStorage);
    }

self._type = type;
    self._vis = _vis[type];
    if (!skipDraw) {
      self._draw();
    }
  },

/**
   * Set and update the data for the chart. Optionally skip drawing.
   *
   * @param object data       New data. See new xChart example for format
   *
   */
  setData: function (data) {
    var self = this,
      o = self._options,
      nData = _.clone(data);

if (!data.hasOwnProperty('main')) {
      throw 'No "main" key found in given chart data.';
    }

switch (data.type) {
    case 'bar':
      // force the xScale to be ordinal
      data.xScale = 'ordinal';
      break;
    case undefined:
      data.type = self._type;
      break;
    }

o.xMin = (isNaN(parseInt(data.xMin, 10))) ? o.xMin : data.xMin;
    o.xMax = (isNaN(parseInt(data.xMax, 10))) ? o.xMax : data.xMax;
    o.yMin = (isNaN(parseInt(data.yMin, 10))) ? o.yMin : data.yMin;
    o.yMax = (isNaN(parseInt(data.yMax, 10))) ? o.yMax : data.yMax;

if (self._vis) {
      self._destroy(self._vis, self._mainStorage);
    }

self.setType(data.type, true);

nData.main = _.map(nData.main, _mapData);
    self._mainData = nData.main;
    self._xScaleType = nData.xScale;
    self._yScaleType = nData.yScale;

if (nData.hasOwnProperty('comp')) {
      nData.comp = _.map(nData.comp, _mapData);
      self._compData = nData.comp;
    } else {
      self._compData = [];
    }

self._draw();
  },

/**
   * Change the scale of an axis
   *
   * @param string axis   Name of an axis. One of 'x' or 'y'
   * @param string type   Name of the scale type
   *
   */
  setScale: function (axis, type) {
    var self = this;

switch (axis) {
    case 'x':
      self._xScaleType = type;
      break;
    case 'y':
      self._yScaleType = type;
      break;
    default:
      throw 'Cannot change scale of unknown axis "' + axis + '".';
    }

self._draw();
  },

/**
   * Create the SVG element and g container. Resize if necessary.
   */
  _drawSvg: function () {
    var self = this,
      c = self._container,
      options = self._options,
      width = parseInt(c.style('width').replace('px', ''), 10),
      height = parseInt(c.style('height').replace('px', ''), 10),
      svg,
      g,
      gScale;

svg = c.selectAll('svg')
      .data(emptyData);

svg.enter().append('svg')
      // Inherit the height and width from the parent element
      .attr('height', height)
      .attr('width', width)
      .attr('class', 'xchart');

svg.transition()
      .attr('width', width)
      .attr('height', height);

g = svg.selectAll('g')
      .data(emptyData);

g.enter().append('g')
      .attr(
        'transform',
        'translate(' + options.paddingLeft + ',' + options.paddingTop + ')'
      );

gScale = g.selectAll('g.scale')
      .data(emptyData);

gScale.enter().append('g')
      .attr('class', 'scale');

self._svg = svg;
    self._g = g;
    self._gScale = gScale;

self._height = height - options.paddingTop - options.paddingBottom -
      options.axisPaddingTop - options.axisPaddingBottom;
    self._width = width - options.paddingLeft - options.paddingRight -
      options.axisPaddingLeft - options.axisPaddingRight;
  },

/**
   * Resize the visualization
   */
  _resize: function (event) {
    var self = this;

self._drawSvg();
    self._draw();
  },

/**
   * Draw the x and y axes
   */
  _drawAxes: function () {
    if (this._noData) {
      return;
    }
    var self = this,
      o = self._options,
      t = self._gScale.transition().duration(o.timing),
      xTicks = o.tickHintX,
      yTicks = o.tickHintY,
      bottom = self._height + o.axisPaddingTop + o.axisPaddingBottom,
      zeroLine = d3.svg.line().x(function (d) { return d; }),
      zLine,
      zLinePath,
      xAxis,
      xRules,
      yAxis,
      yRules,
      labels;

xRules = d3.svg.axis()
      .scale(self.xScale)
      .ticks(xTicks)
      .tickSize(-self._height)
      .tickFormat(o.tickFormatX)
      .orient('bottom');

xAxis = self._gScale.selectAll('g.axisX')
      .data(emptyData);

xAxis.enter().append('g')
      .attr('class', 'axis axisX')
      .attr('transform', 'translate(0,' + bottom + ')');

xAxis.call(xRules);

labels = self._gScale.selectAll('.axisX g')[0];
    if (labels.length > (self._width / 80)) {
      labels.sort(function (a, b) {
        var r = /translate\(([^,)]+)/;
        a = a.getAttribute('transform').match(r);
        b = b.getAttribute('transform').match(r);
        return parseFloat(a[1], 10) - parseFloat(b[1], 10);
      });

d3.selectAll(labels)
        .filter(function (d, i) {
          return i % (Math.ceil(labels.length / xTicks) + 1);
        })
        .remove();
    }

yRules = d3.svg.axis()
      .scale(self.yScale)
      .ticks(yTicks)
      .tickSize(-self._width - o.axisPaddingRight - o.axisPaddingLeft)
      .tickFormat(o.tickFormatY)
      .orient('left');

yAxis = self._gScale.selectAll('g.axisY')
      .data(emptyData);

yAxis.enter().append('g')
      .attr('class', 'axis axisY')
      .attr('transform', 'translate(0,0)');

t.selectAll('g.axisY')
      .call(yRules);

// zero line
    zLine = self._gScale.selectAll('g.axisZero')
      .data([[]]);

zLine.enter().append('g')
      .attr('class', 'axisZero');

zLinePath = zLine.selectAll('line')
      .data([[]]);

zLinePath.enter().append('line')
      .attr('x1', 0)
      .attr('x2', self._width + o.axisPaddingLeft + o.axisPaddingRight)
      .attr('y1', self.yZero)
      .attr('y2', self.yZero);

zLinePath.transition().duration(o.timing)
      .attr('y1', self.yZero)
      .attr('y2', self.yZero);
  },

/**
   * Update the x and y scales (used when drawing)
   *
   * Optional methods in drawing types:
   *    preUpdateScale
   *    postUpdateScale
   *
   * Example implementation in vis type:
   *
   *    function postUpdateScale(self, scaleData, mainData, compData) {
   *      self.xScale2 = d3.scale.ordinal()
   *        .domain(d3.range(0, mainData.length))
   *        .rangeRoundBands([0, self.xScale.rangeBand()], 0.08);
   *    }
   *
   */
  _updateScale: function () {
    var self = this,
      _unionData = function () {
        return _.union(self._mainData, self._compData);
      },
      scaleData = _unionData(),
      vis = self._vis,
      scale,
      min;

delete self.xScale;
    delete self.yScale;
    delete self.yZero;

if (vis.hasOwnProperty('preUpdateScale')) {
      vis.preUpdateScale(self, scaleData, self._mainData, self._compData);
    }

// Just in case preUpdateScale modified
    scaleData = _unionData();
    scale = _scales.xy(self, scaleData, self._xScaleType, self._yScaleType);

self.xScale = scale.x;
    self.yScale = scale.y;

min = self.yScale.domain()[0];
    self.yZero = (min > 0) ? self.yScale(min) : self.yScale(0);

if (vis.hasOwnProperty('postUpdateScale')) {
      vis.postUpdateScale(self, scaleData, self._mainData, self._compData);
    }
  },

/**
   * Create (Enter) the elements for the vis
   *
   * Required method
   *
   * Example implementation in vis type:
   *
   *    function enter(self, data, callbacks) {
   *      var foo = self._g.selectAll('g.foobar')
   *        .data(data);
   *      foo.enter().append('g')
   *        .attr('class', 'foobar');
   *      self.foo = foo;
   *    }
   */
  _enter: function (vis, storage, data, className) {
    var self = this,
      callbacks = {
        click: self._options.click,
        mouseover: self._options.mouseover,
        mouseout: self._options.mouseout
      };
    self._checkVisMethod(vis, 'enter');
    vis.enter(self, storage, className, data, callbacks);
  },

/**
   * Update the elements opened by the select method
   *
   * Required method
   *
   * Example implementation in vis type:
   *
   *    function update(self, timing) {
   *      self.bars.transition().duration(timing)
   *        .attr('width', self.xScale2.rangeBand())
   *        .attr('height', function (d) {
   *          return self.yScale(d.y);
   *        });
   *    }
   */
  _update: function (vis, storage) {
    var self = this;
    self._checkVisMethod(vis, 'update');
    vis.update(self, storage, self._options.timing);
  },

/**
   * Remove or transition out the elements that no longer have data
   *
   * Required method
   *
   * Example implementation in vis type:
   *
   *    function exit(self) {
   *      self.bars.exit().remove();
   *    }
   */
  _exit: function (vis, storage) {
    var self = this;
    self._checkVisMethod(vis, 'exit');
    vis.exit(self, storage, self._options.timing);
  },

/**
   * Destroy the current vis type (transition to new type)
   *
   * Required method
   *
   * Example implementation in vis type:
   *
   *    function destroy(self, timing) {
   *      self.bars.transition().duration(timing)
   *        attr('height', 0);
   *      delete self.bars;
   *    }
   */
  _destroy: function (vis, storage) {
    var self = this;
    self._checkVisMethod(vis, 'destroy');
    try {
      vis.destroy(self, storage, self._options.timing);
    } catch (e) {}
  },

/**
   * Draw the visualization
   */
  _draw: function () {
    var self = this,
      o = self._options,
      comp,
      compKeys;

self._noData = _.flatten(_.pluck(self._mainData, 'data')
      .concat(_.pluck(self._compData, 'data'))).length === 0;

self._updateScale();
    self._drawAxes();

self._enter(self._vis, self._mainStorage, self._mainData, '.main');
    self._exit(self._vis, self._mainStorage);
    self._update(self._vis, self._mainStorage);

comp = _.chain(self._compData).groupBy(function (d) {
      return d.type;
    });
    compKeys = comp.keys();

// Find old comp vis items and remove any that no longer exist
    _.each(self._compStorage, function (d, key) {
      if (-1 === compKeys.indexOf(key).value()) {
        var vis = _vis[key];
        self._enter(vis, d, [], '.comp.' + key.replace(/\W+/g, ''));
        self._exit(vis, d);
      }
    });

comp.each(function (d, key) {
      var vis = _vis[key], storage;
      if (!self._compStorage.hasOwnProperty(key)) {
        self._compStorage[key] = {};
      }
      storage = self._compStorage[key];
      self._enter(vis, storage, d, '.comp.' + key.replace(/\W+/g, ''));
      self._exit(vis, storage);
      self._update(vis, storage);
    });

if (self._noData) {
      o.empty(self, self._selector, self._mainData);
    } else {
      o.notempty(self, self._selector);
    }
  },

/**
   * Ensure drawing method exists
   */
  _checkVisMethod: function (vis, method) {
    var self = this;
    if (!vis[method]) {
      throw 'Required method "' + method + '" not found on vis type "' +
        self._type + '".';
    }
  }
});
if (typeof define === 'function' && define.amd && typeof define.amd === 'object') {
  define(function () {
    return xChart;
  });
  return;
}

window.xChart = xChart;

}());