Created
June 2, 2015 13:59
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PtgDoughnut Chart.js extension
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| /** | |
| * Custom chart | |
| */ | |
| Chart.types.Doughnut.extend({ | |
| name: "PtgDoughnut", | |
| // Check if we need to extend the scale | |
| initialize: function(data){ | |
| this.options.onAnimationProgress = function(easeDecimal){ | |
| this.drawPercentage((easeDecimal * this.segments[0].value).toFixed(1)); | |
| }; | |
| this.options.onAnimationComplete = function(){ | |
| this.animationComplete = true; | |
| }; | |
| Chart.types.Doughnut.prototype.initialize.apply(this, arguments); | |
| }, | |
| // Draw the line on clear | |
| clear: function(data){ | |
| Chart.types.Doughnut.prototype.clear.apply(this, arguments); | |
| if(this.animationComplete) { | |
| this.drawPercentage(this.segments[0].value.toFixed(1)); | |
| } | |
| }, | |
| // Draw the percentage | |
| drawPercentage: function(val){ | |
| this.chart.ctx.textAlign = "center"; | |
| this.chart.ctx.textBaseline = "middle"; | |
| this.chart.ctx.fillStyle = '#333'; | |
| this.chart.ctx.font = Chart.helpers.fontString(20, 'normal', '"Helvetica Neue",Helvetica,Arial,sans-serif'); | |
| this.chart.ctx.fillText(val + '%', (this.chart.width / 2) , (this.chart.height / 2)); | |
| } | |
| }); |
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