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Initial Commit
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usmannasir
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(function(){
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"use strict";
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var root = this,
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Chart = root.Chart,
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//Cache a local reference to Chart.helpers
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helpers = Chart.helpers;
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var defaultConfig = {
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//Boolean - Show a backdrop to the scale label
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scaleShowLabelBackdrop : true,
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//String - The colour of the label backdrop
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scaleBackdropColor : "rgba(255,255,255,0.75)",
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// Boolean - Whether the scale should begin at zero
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scaleBeginAtZero : true,
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//Number - The backdrop padding above & below the label in pixels
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scaleBackdropPaddingY : 2,
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//Number - The backdrop padding to the side of the label in pixels
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scaleBackdropPaddingX : 2,
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//Boolean - Show line for each value in the scale
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scaleShowLine : true,
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//Boolean - Stroke a line around each segment in the chart
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segmentShowStroke : true,
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//String - The colour of the stroke on each segement.
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segmentStrokeColor : "#fff",
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//Number - The width of the stroke value in pixels
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segmentStrokeWidth : 2,
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//Number - Amount of animation steps
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animationSteps : 100,
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//String - Animation easing effect.
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animationEasing : "easeOutBounce",
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//Boolean - Whether to animate the rotation of the chart
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animateRotate : true,
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//Boolean - Whether to animate scaling the chart from the centre
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animateScale : false,
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//String - A legend template
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legendTemplate : "<ul class=\"<%=name.toLowerCase()%>-legend\"><% for (var i=0; i<segments.length; i++){%><li><span style=\"background-color:<%=segments[i].fillColor%>\"></span><%if(segments[i].label){%><%=segments[i].label%><%}%></li><%}%></ul>"
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};
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Chart.Type.extend({
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//Passing in a name registers this chart in the Chart namespace
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name: "PolarArea",
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//Providing a defaults will also register the deafults in the chart namespace
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defaults : defaultConfig,
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//Initialize is fired when the chart is initialized - Data is passed in as a parameter
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//Config is automatically merged by the core of Chart.js, and is available at this.options
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initialize: function(data){
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this.segments = [];
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//Declare segment class as a chart instance specific class, so it can share props for this instance
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this.SegmentArc = Chart.Arc.extend({
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showStroke : this.options.segmentShowStroke,
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strokeWidth : this.options.segmentStrokeWidth,
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strokeColor : this.options.segmentStrokeColor,
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ctx : this.chart.ctx,
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innerRadius : 0,
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x : this.chart.width/2,
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y : this.chart.height/2
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});
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this.scale = new Chart.RadialScale({
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display: this.options.showScale,
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fontStyle: this.options.scaleFontStyle,
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fontSize: this.options.scaleFontSize,
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fontFamily: this.options.scaleFontFamily,
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fontColor: this.options.scaleFontColor,
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showLabels: this.options.scaleShowLabels,
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showLabelBackdrop: this.options.scaleShowLabelBackdrop,
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backdropColor: this.options.scaleBackdropColor,
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backdropPaddingY : this.options.scaleBackdropPaddingY,
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backdropPaddingX: this.options.scaleBackdropPaddingX,
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lineWidth: (this.options.scaleShowLine) ? this.options.scaleLineWidth : 0,
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lineColor: this.options.scaleLineColor,
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lineArc: true,
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width: this.chart.width,
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height: this.chart.height,
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xCenter: this.chart.width/2,
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yCenter: this.chart.height/2,
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ctx : this.chart.ctx,
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templateString: this.options.scaleLabel,
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valuesCount: data.length
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});
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this.updateScaleRange(data);
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this.scale.update();
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helpers.each(data,function(segment,index){
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this.addData(segment,index,true);
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},this);
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//Set up tooltip events on the chart
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if (this.options.showTooltips){
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helpers.bindEvents(this, this.options.tooltipEvents, function(evt){
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var activeSegments = (evt.type !== 'mouseout') ? this.getSegmentsAtEvent(evt) : [];
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helpers.each(this.segments,function(segment){
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segment.restore(["fillColor"]);
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});
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helpers.each(activeSegments,function(activeSegment){
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activeSegment.fillColor = activeSegment.highlightColor;
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});
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this.showTooltip(activeSegments);
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});
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}
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this.render();
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},
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getSegmentsAtEvent : function(e){
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var segmentsArray = [];
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var location = helpers.getRelativePosition(e);
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helpers.each(this.segments,function(segment){
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if (segment.inRange(location.x,location.y)) segmentsArray.push(segment);
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},this);
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return segmentsArray;
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},
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addData : function(segment, atIndex, silent){
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var index = atIndex || this.segments.length;
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this.segments.splice(index, 0, new this.SegmentArc({
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fillColor: segment.color,
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highlightColor: segment.highlight || segment.color,
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label: segment.label,
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value: segment.value,
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outerRadius: (this.options.animateScale) ? 0 : this.scale.calculateCenterOffset(segment.value),
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circumference: (this.options.animateRotate) ? 0 : this.scale.getCircumference(),
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startAngle: Math.PI * 1.5
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}));
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if (!silent){
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this.reflow();
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this.update();
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}
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},
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removeData: function(atIndex){
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var indexToDelete = (helpers.isNumber(atIndex)) ? atIndex : this.segments.length-1;
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this.segments.splice(indexToDelete, 1);
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this.reflow();
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this.update();
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},
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calculateTotal: function(data){
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this.total = 0;
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helpers.each(data,function(segment){
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this.total += segment.value;
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},this);
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this.scale.valuesCount = this.segments.length;
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},
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updateScaleRange: function(datapoints){
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var valuesArray = [];
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helpers.each(datapoints,function(segment){
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valuesArray.push(segment.value);
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});
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var scaleSizes = (this.options.scaleOverride) ?
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{
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steps: this.options.scaleSteps,
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stepValue: this.options.scaleStepWidth,
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min: this.options.scaleStartValue,
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max: this.options.scaleStartValue + (this.options.scaleSteps * this.options.scaleStepWidth)
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} :
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helpers.calculateScaleRange(
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valuesArray,
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helpers.min([this.chart.width, this.chart.height])/2,
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this.options.scaleFontSize,
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this.options.scaleBeginAtZero,
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this.options.scaleIntegersOnly
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);
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helpers.extend(
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this.scale,
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scaleSizes,
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{
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size: helpers.min([this.chart.width, this.chart.height]),
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xCenter: this.chart.width/2,
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yCenter: this.chart.height/2
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}
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);
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},
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update : function(){
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this.calculateTotal(this.segments);
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helpers.each(this.segments,function(segment){
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segment.save();
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});
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this.render();
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},
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reflow : function(){
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helpers.extend(this.SegmentArc.prototype,{
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x : this.chart.width/2,
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y : this.chart.height/2
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});
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this.updateScaleRange(this.segments);
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this.scale.update();
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helpers.extend(this.scale,{
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xCenter: this.chart.width/2,
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yCenter: this.chart.height/2
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});
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helpers.each(this.segments, function(segment){
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segment.update({
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outerRadius : this.scale.calculateCenterOffset(segment.value)
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});
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}, this);
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},
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draw : function(ease){
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var easingDecimal = ease || 1;
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//Clear & draw the canvas
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this.clear();
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helpers.each(this.segments,function(segment, index){
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segment.transition({
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circumference : this.scale.getCircumference(),
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outerRadius : this.scale.calculateCenterOffset(segment.value)
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},easingDecimal);
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segment.endAngle = segment.startAngle + segment.circumference;
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// If we've removed the first segment we need to set the first one to
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// start at the top.
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if (index === 0){
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segment.startAngle = Math.PI * 1.5;
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}
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//Check to see if it's the last segment, if not get the next and update the start angle
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if (index < this.segments.length - 1){
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this.segments[index+1].startAngle = segment.endAngle;
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}
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segment.draw();
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}, this);
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this.scale.draw();
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}
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});
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}).call(this);
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