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https://github.com/JonnyBro/JaBa.git
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302 lines
9.5 KiB
JavaScript
302 lines
9.5 KiB
JavaScript
(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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helpers = Chart.helpers;
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var defaultConfig = {
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//Boolean - Whether the scale should start at zero, or an order of magnitude down from the lowest value
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scaleBeginAtZero : true,
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//Boolean - Whether grid lines are shown across the chart
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scaleShowGridLines : true,
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//String - Colour of the grid lines
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scaleGridLineColor : "rgba(0,0,0,.05)",
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//Number - Width of the grid lines
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scaleGridLineWidth : 1,
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//Boolean - Whether to show horizontal lines (except X axis)
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scaleShowHorizontalLines: true,
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//Boolean - Whether to show vertical lines (except Y axis)
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scaleShowVerticalLines: true,
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//Boolean - If there is a stroke on each bar
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barShowStroke : true,
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//Number - Pixel width of the bar stroke
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barStrokeWidth : 2,
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//Number - Spacing between each of the X value sets
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barValueSpacing : 5,
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//Number - Spacing between data sets within X values
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barDatasetSpacing : 1,
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//String - A legend template
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legendTemplate : "<ul class=\"<%=name.toLowerCase()%>-legend\"><% for (var i=0; i<datasets.length; i++){%><li><span style=\"background-color:<%=datasets[i].fillColor%>\"></span><%if(datasets[i].label){%><%=datasets[i].label%><%}%></li><%}%></ul>"
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};
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Chart.Type.extend({
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name: "Bar",
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defaults : defaultConfig,
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initialize: function(data){
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//Expose options as a scope variable here so we can access it in the ScaleClass
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var options = this.options;
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this.ScaleClass = Chart.Scale.extend({
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offsetGridLines : true,
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calculateBarX : function(datasetCount, datasetIndex, barIndex){
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//Reusable method for calculating the xPosition of a given bar based on datasetIndex & width of the bar
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var xWidth = this.calculateBaseWidth(),
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xAbsolute = this.calculateX(barIndex) - (xWidth/2),
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barWidth = this.calculateBarWidth(datasetCount);
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return xAbsolute + (barWidth * datasetIndex) + (datasetIndex * options.barDatasetSpacing) + barWidth/2;
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},
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calculateBaseWidth : function(){
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return (this.calculateX(1) - this.calculateX(0)) - (2*options.barValueSpacing);
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},
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calculateBarWidth : function(datasetCount){
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//The padding between datasets is to the right of each bar, providing that there are more than 1 dataset
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var baseWidth = this.calculateBaseWidth() - ((datasetCount - 1) * options.barDatasetSpacing);
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return (baseWidth / datasetCount);
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}
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});
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this.datasets = [];
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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 activeBars = (evt.type !== 'mouseout') ? this.getBarsAtEvent(evt) : [];
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this.eachBars(function(bar){
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bar.restore(['fillColor', 'strokeColor']);
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});
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helpers.each(activeBars, function(activeBar){
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activeBar.fillColor = activeBar.highlightFill;
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activeBar.strokeColor = activeBar.highlightStroke;
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});
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this.showTooltip(activeBars);
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});
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}
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//Declare the extension of the default point, to cater for the options passed in to the constructor
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this.BarClass = Chart.Rectangle.extend({
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strokeWidth : this.options.barStrokeWidth,
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showStroke : this.options.barShowStroke,
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ctx : this.chart.ctx
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});
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//Iterate through each of the datasets, and build this into a property of the chart
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helpers.each(data.datasets,function(dataset,datasetIndex){
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var datasetObject = {
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label : dataset.label || null,
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fillColor : dataset.fillColor,
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strokeColor : dataset.strokeColor,
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bars : []
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};
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this.datasets.push(datasetObject);
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helpers.each(dataset.data,function(dataPoint,index){
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//Add a new point for each piece of data, passing any required data to draw.
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datasetObject.bars.push(new this.BarClass({
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value : dataPoint,
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label : data.labels[index],
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datasetLabel: dataset.label,
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strokeColor : dataset.strokeColor,
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fillColor : dataset.fillColor,
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highlightFill : dataset.highlightFill || dataset.fillColor,
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highlightStroke : dataset.highlightStroke || dataset.strokeColor
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}));
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},this);
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},this);
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this.buildScale(data.labels);
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this.BarClass.prototype.base = this.scale.endPoint;
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this.eachBars(function(bar, index, datasetIndex){
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helpers.extend(bar, {
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width : this.scale.calculateBarWidth(this.datasets.length),
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x: this.scale.calculateBarX(this.datasets.length, datasetIndex, index),
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y: this.scale.endPoint
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});
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bar.save();
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}, this);
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this.render();
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},
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update : function(){
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this.scale.update();
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// Reset any highlight colours before updating.
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helpers.each(this.activeElements, function(activeElement){
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activeElement.restore(['fillColor', 'strokeColor']);
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});
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this.eachBars(function(bar){
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bar.save();
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});
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this.render();
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},
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eachBars : function(callback){
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helpers.each(this.datasets,function(dataset, datasetIndex){
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helpers.each(dataset.bars, callback, this, datasetIndex);
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},this);
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},
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getBarsAtEvent : function(e){
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var barsArray = [],
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eventPosition = helpers.getRelativePosition(e),
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datasetIterator = function(dataset){
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barsArray.push(dataset.bars[barIndex]);
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},
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barIndex;
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for (var datasetIndex = 0; datasetIndex < this.datasets.length; datasetIndex++) {
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for (barIndex = 0; barIndex < this.datasets[datasetIndex].bars.length; barIndex++) {
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if (this.datasets[datasetIndex].bars[barIndex].inRange(eventPosition.x,eventPosition.y)){
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helpers.each(this.datasets, datasetIterator);
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return barsArray;
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}
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}
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}
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return barsArray;
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},
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buildScale : function(labels){
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var self = this;
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var dataTotal = function(){
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var values = [];
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self.eachBars(function(bar){
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values.push(bar.value);
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});
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return values;
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};
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var scaleOptions = {
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templateString : this.options.scaleLabel,
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height : this.chart.height,
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width : this.chart.width,
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ctx : this.chart.ctx,
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textColor : this.options.scaleFontColor,
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fontSize : this.options.scaleFontSize,
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fontStyle : this.options.scaleFontStyle,
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fontFamily : this.options.scaleFontFamily,
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valuesCount : labels.length,
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beginAtZero : this.options.scaleBeginAtZero,
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integersOnly : this.options.scaleIntegersOnly,
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calculateYRange: function(currentHeight){
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var updatedRanges = helpers.calculateScaleRange(
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dataTotal(),
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currentHeight,
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this.fontSize,
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this.beginAtZero,
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this.integersOnly
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);
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helpers.extend(this, updatedRanges);
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},
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xLabels : labels,
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font : helpers.fontString(this.options.scaleFontSize, this.options.scaleFontStyle, this.options.scaleFontFamily),
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lineWidth : this.options.scaleLineWidth,
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lineColor : this.options.scaleLineColor,
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showHorizontalLines : this.options.scaleShowHorizontalLines,
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showVerticalLines : this.options.scaleShowVerticalLines,
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gridLineWidth : (this.options.scaleShowGridLines) ? this.options.scaleGridLineWidth : 0,
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gridLineColor : (this.options.scaleShowGridLines) ? this.options.scaleGridLineColor : "rgba(0,0,0,0)",
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padding : (this.options.showScale) ? 0 : (this.options.barShowStroke) ? this.options.barStrokeWidth : 0,
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showLabels : this.options.scaleShowLabels,
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display : this.options.showScale
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};
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if (this.options.scaleOverride){
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helpers.extend(scaleOptions, {
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calculateYRange: helpers.noop,
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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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}
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this.scale = new this.ScaleClass(scaleOptions);
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},
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addData : function(valuesArray,label){
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//Map the values array for each of the datasets
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helpers.each(valuesArray,function(value,datasetIndex){
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//Add a new point for each piece of data, passing any required data to draw.
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this.datasets[datasetIndex].bars.push(new this.BarClass({
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value : value,
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label : label,
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x: this.scale.calculateBarX(this.datasets.length, datasetIndex, this.scale.valuesCount+1),
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y: this.scale.endPoint,
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width : this.scale.calculateBarWidth(this.datasets.length),
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base : this.scale.endPoint,
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strokeColor : this.datasets[datasetIndex].strokeColor,
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fillColor : this.datasets[datasetIndex].fillColor
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}));
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},this);
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this.scale.addXLabel(label);
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//Then re-render the chart.
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this.update();
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},
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removeData : function(){
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this.scale.removeXLabel();
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//Then re-render the chart.
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helpers.each(this.datasets,function(dataset){
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dataset.bars.shift();
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},this);
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this.update();
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},
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reflow : function(){
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helpers.extend(this.BarClass.prototype,{
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y: this.scale.endPoint,
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base : this.scale.endPoint
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});
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var newScaleProps = helpers.extend({
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height : this.chart.height,
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width : this.chart.width
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});
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this.scale.update(newScaleProps);
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},
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draw : function(ease){
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var easingDecimal = ease || 1;
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this.clear();
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var ctx = this.chart.ctx;
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this.scale.draw(easingDecimal);
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//Draw all the bars for each dataset
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helpers.each(this.datasets,function(dataset,datasetIndex){
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helpers.each(dataset.bars,function(bar,index){
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if (bar.hasValue()){
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bar.base = this.scale.endPoint;
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//Transition then draw
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bar.transition({
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x : this.scale.calculateBarX(this.datasets.length, datasetIndex, index),
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y : this.scale.calculateY(bar.value),
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width : this.scale.calculateBarWidth(this.datasets.length)
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}, easingDecimal).draw();
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}
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},this);
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},this);
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}
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});
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}).call(this);
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