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(function(){
"use strict";
var root = this,
Chart = root.Chart,
helpers = Chart.helpers;
Chart.Type.extend({
name: "Radar",
defaults:{
//Boolean - Whether to show lines for each scale point
scaleShowLine : true,
//Boolean - Whether we show the angle lines out of the radar
angleShowLineOut : true,
//Boolean - Whether to show labels on the scale
scaleShowLabels : false,
// Boolean - Whether the scale should begin at zero
scaleBeginAtZero : true,
//String - Colour of the angle line
angleLineColor : "rgba(0,0,0,.1)",
//Number - Pixel width of the angle line
angleLineWidth : 1,
//String - Point label font declaration
pointLabelFontFamily : "'Arial'",
//String - Point label font weight
pointLabelFontStyle : "normal",
//Number - Point label font size in pixels
pointLabelFontSize : 10,
//String - Point label font colour
pointLabelFontColor : "#666",
//Boolean - Whether to show a dot for each point
pointDot : true,
//Number - Radius of each point dot in pixels
pointDotRadius : 3,
//Number - Pixel width of point dot stroke
pointDotStrokeWidth : 1,
//Number - amount extra to add to the radius to cater for hit detection outside the drawn point
pointHitDetectionRadius : 20,
//Boolean - Whether to show a stroke for datasets
datasetStroke : true,
//Number - Pixel width of dataset stroke
datasetStrokeWidth : 2,
//Boolean - Whether to fill the dataset with a colour
datasetFill : true,
//String - A legend template
legendTemplate : "<ul class=\"<%=name.toLowerCase()%>-legend\"><% for (var i=0; i<datasets.length; i++){%><li><span style=\"background-color:<%=datasets[i].strokeColor%>\"></span><%if(datasets[i].label){%><%=datasets[i].label%><%}%></li><%}%></ul>"
},
initialize: function(data){
this.PointClass = Chart.Point.extend({
strokeWidth : this.options.pointDotStrokeWidth,
radius : this.options.pointDotRadius,
display: this.options.pointDot,
hitDetectionRadius : this.options.pointHitDetectionRadius,
ctx : this.chart.ctx
});
this.datasets = [];
this.buildScale(data);
//Set up tooltip events on the chart
if (this.options.showTooltips){
helpers.bindEvents(this, this.options.tooltipEvents, function(evt){
var activePointsCollection = (evt.type !== 'mouseout') ? this.getPointsAtEvent(evt) : [];
this.eachPoints(function(point){
point.restore(['fillColor', 'strokeColor']);
});
helpers.each(activePointsCollection, function(activePoint){
activePoint.fillColor = activePoint.highlightFill;
activePoint.strokeColor = activePoint.highlightStroke;
});
this.showTooltip(activePointsCollection);
});
}
//Iterate through each of the datasets, and build this into a property of the chart
helpers.each(data.datasets,function(dataset){
var datasetObject = {
label: dataset.label || null,
fillColor : dataset.fillColor,
strokeColor : dataset.strokeColor,
pointColor : dataset.pointColor,
pointStrokeColor : dataset.pointStrokeColor,
points : []
};
this.datasets.push(datasetObject);
helpers.each(dataset.data,function(dataPoint,index){
//Add a new point for each piece of data, passing any required data to draw.
var pointPosition;
if (!this.scale.animation){
pointPosition = this.scale.getPointPosition(index, this.scale.calculateCenterOffset(dataPoint));
}
datasetObject.points.push(new this.PointClass({
value : dataPoint,
label : data.labels[index],
datasetLabel: dataset.label,
x: (this.options.animation) ? this.scale.xCenter : pointPosition.x,
y: (this.options.animation) ? this.scale.yCenter : pointPosition.y,
strokeColor : dataset.pointStrokeColor,
fillColor : dataset.pointColor,
highlightFill : dataset.pointHighlightFill || dataset.pointColor,
highlightStroke : dataset.pointHighlightStroke || dataset.pointStrokeColor
}));
},this);
},this);
this.render();
},
eachPoints : function(callback){
helpers.each(this.datasets,function(dataset){
helpers.each(dataset.points,callback,this);
},this);
},
getPointsAtEvent : function(evt){
var mousePosition = helpers.getRelativePosition(evt),
fromCenter = helpers.getAngleFromPoint({
x: this.scale.xCenter,
y: this.scale.yCenter
}, mousePosition);
var anglePerIndex = (Math.PI * 2) /this.scale.valuesCount,
pointIndex = Math.round((fromCenter.angle - Math.PI * 1.5) / anglePerIndex),
activePointsCollection = [];
// If we're at the top, make the pointIndex 0 to get the first of the array.
if (pointIndex >= this.scale.valuesCount || pointIndex < 0){
pointIndex = 0;
}
if (fromCenter.distance <= this.scale.drawingArea){
helpers.each(this.datasets, function(dataset){
activePointsCollection.push(dataset.points[pointIndex]);
});
}
return activePointsCollection;
},
buildScale : function(data){
this.scale = new Chart.RadialScale({
display: this.options.showScale,
fontStyle: this.options.scaleFontStyle,
fontSize: this.options.scaleFontSize,
fontFamily: this.options.scaleFontFamily,
fontColor: this.options.scaleFontColor,
showLabels: this.options.scaleShowLabels,
showLabelBackdrop: this.options.scaleShowLabelBackdrop,
backdropColor: this.options.scaleBackdropColor,
backdropPaddingY : this.options.scaleBackdropPaddingY,
backdropPaddingX: this.options.scaleBackdropPaddingX,
lineWidth: (this.options.scaleShowLine) ? this.options.scaleLineWidth : 0,
lineColor: this.options.scaleLineColor,
angleLineColor : this.options.angleLineColor,
angleLineWidth : (this.options.angleShowLineOut) ? this.options.angleLineWidth : 0,
// Point labels at the edge of each line
pointLabelFontColor : this.options.pointLabelFontColor,
pointLabelFontSize : this.options.pointLabelFontSize,
pointLabelFontFamily : this.options.pointLabelFontFamily,
pointLabelFontStyle : this.options.pointLabelFontStyle,
height : this.chart.height,
width: this.chart.width,
xCenter: this.chart.width/2,
yCenter: this.chart.height/2,
ctx : this.chart.ctx,
templateString: this.options.scaleLabel,
labels: data.labels,
valuesCount: data.datasets[0].data.length
});
this.scale.setScaleSize();
this.updateScaleRange(data.datasets);
this.scale.buildYLabels();
},
updateScaleRange: function(datasets){
var valuesArray = (function(){
var totalDataArray = [];
helpers.each(datasets,function(dataset){
if (dataset.data){
totalDataArray = totalDataArray.concat(dataset.data);
}
else {
helpers.each(dataset.points, function(point){
totalDataArray.push(point.value);
});
}
});
return totalDataArray;
})();
var scaleSizes = (this.options.scaleOverride) ?
{
steps: this.options.scaleSteps,
stepValue: this.options.scaleStepWidth,
min: this.options.scaleStartValue,
max: this.options.scaleStartValue + (this.options.scaleSteps * this.options.scaleStepWidth)
} :
helpers.calculateScaleRange(
valuesArray,
helpers.min([this.chart.width, this.chart.height])/2,
this.options.scaleFontSize,
this.options.scaleBeginAtZero,
this.options.scaleIntegersOnly
);
helpers.extend(
this.scale,
scaleSizes
);
},
addData : function(valuesArray,label){
//Map the values array for each of the datasets
this.scale.valuesCount++;
helpers.each(valuesArray,function(value,datasetIndex){
var pointPosition = this.scale.getPointPosition(this.scale.valuesCount, this.scale.calculateCenterOffset(value));
this.datasets[datasetIndex].points.push(new this.PointClass({
value : value,
label : label,
x: pointPosition.x,
y: pointPosition.y,
strokeColor : this.datasets[datasetIndex].pointStrokeColor,
fillColor : this.datasets[datasetIndex].pointColor
}));
},this);
this.scale.labels.push(label);
this.reflow();
this.update();
},
removeData : function(){
this.scale.valuesCount--;
this.scale.labels.shift();
helpers.each(this.datasets,function(dataset){
dataset.points.shift();
},this);
this.reflow();
this.update();
},
update : function(){
this.eachPoints(function(point){
point.save();
});
this.reflow();
this.render();
},
reflow: function(){
helpers.extend(this.scale, {
width : this.chart.width,
height: this.chart.height,
size : helpers.min([this.chart.width, this.chart.height]),
xCenter: this.chart.width/2,
yCenter: this.chart.height/2
});
this.updateScaleRange(this.datasets);
this.scale.setScaleSize();
this.scale.buildYLabels();
},
draw : function(ease){
var easeDecimal = ease || 1,
ctx = this.chart.ctx;
this.clear();
this.scale.draw();
helpers.each(this.datasets,function(dataset){
//Transition each point first so that the line and point drawing isn't out of sync
helpers.each(dataset.points,function(point,index){
if (point.hasValue()){
point.transition(this.scale.getPointPosition(index, this.scale.calculateCenterOffset(point.value)), easeDecimal);
}
},this);
//Draw the line between all the points
ctx.lineWidth = this.options.datasetStrokeWidth;
ctx.strokeStyle = dataset.strokeColor;
ctx.beginPath();
helpers.each(dataset.points,function(point,index){
if (index === 0){
ctx.moveTo(point.x,point.y);
}
else{
ctx.lineTo(point.x,point.y);
}
},this);
ctx.closePath();
ctx.stroke();
ctx.fillStyle = dataset.fillColor;
ctx.fill();
//Now draw the points over the line
//A little inefficient double looping, but better than the line
//lagging behind the point positions
helpers.each(dataset.points,function(point){
if (point.hasValue()){
point.draw();
}
});
},this);
}
});
}).call(this);