118 lines
3.8 KiB
JavaScript
Executable File
118 lines
3.8 KiB
JavaScript
Executable File
/*global window: false */
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"use strict";
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module.exports = function(Chart) {
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var helpers = Chart.helpers;
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Chart.defaults.global.animation = {
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duration: 1000,
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easing: "easeOutQuart",
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onProgress: helpers.noop,
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onComplete: helpers.noop
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};
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Chart.Animation = Chart.Element.extend({
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currentStep: null, // the current animation step
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numSteps: 60, // default number of steps
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easing: "", // the easing to use for this animation
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render: null, // render function used by the animation service
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onAnimationProgress: null, // user specified callback to fire on each step of the animation
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onAnimationComplete: null // user specified callback to fire when the animation finishes
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});
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Chart.animationService = {
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frameDuration: 17,
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animations: [],
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dropFrames: 0,
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addAnimation: function(chartInstance, animationObject, duration, lazy) {
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if (!lazy) {
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chartInstance.animating = true;
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}
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for (var index = 0; index < this.animations.length; ++index) {
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if (this.animations[index].chartInstance === chartInstance) {
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// replacing an in progress animation
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this.animations[index].animationObject = animationObject;
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return;
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}
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}
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this.animations.push({
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chartInstance: chartInstance,
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animationObject: animationObject
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});
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// If there are no animations queued, manually kickstart a digest, for lack of a better word
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if (this.animations.length === 1) {
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helpers.requestAnimFrame.call(window, this.digestWrapper);
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}
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},
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// Cancel the animation for a given chart instance
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cancelAnimation: function(chartInstance) {
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var index = helpers.findNextWhere(this.animations, function(animationWrapper) {
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return animationWrapper.chartInstance === chartInstance;
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});
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if (index) {
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this.animations.splice(index, 1);
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chartInstance.animating = false;
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}
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},
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// calls startDigest with the proper context
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digestWrapper: function() {
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Chart.animationService.startDigest.call(Chart.animationService);
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},
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startDigest: function() {
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var startTime = Date.now();
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var framesToDrop = 0;
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if (this.dropFrames > 1) {
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framesToDrop = Math.floor(this.dropFrames);
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this.dropFrames = this.dropFrames % 1;
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}
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for (var i = 0; i < this.animations.length; i++) {
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if (this.animations[i].animationObject.currentStep === null) {
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this.animations[i].animationObject.currentStep = 0;
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}
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this.animations[i].animationObject.currentStep += 1 + framesToDrop;
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if (this.animations[i].animationObject.currentStep > this.animations[i].animationObject.numSteps) {
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this.animations[i].animationObject.currentStep = this.animations[i].animationObject.numSteps;
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}
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this.animations[i].animationObject.render(this.animations[i].chartInstance, this.animations[i].animationObject);
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if (this.animations[i].animationObject.onAnimationProgress && this.animations[i].animationObject.onAnimationProgress.call) {
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this.animations[i].animationObject.onAnimationProgress.call(this.animations[i].chartInstance, this.animations[i]);
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}
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if (this.animations[i].animationObject.currentStep === this.animations[i].animationObject.numSteps) {
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if (this.animations[i].animationObject.onAnimationComplete && this.animations[i].animationObject.onAnimationComplete.call) {
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this.animations[i].animationObject.onAnimationComplete.call(this.animations[i].chartInstance, this.animations[i]);
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}
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// executed the last frame. Remove the animation.
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this.animations[i].chartInstance.animating = false;
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this.animations.splice(i, 1);
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// Keep the index in place to offset the splice
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i--;
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}
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}
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var endTime = Date.now();
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var dropFrames = (endTime - startTime) / this.frameDuration;
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this.dropFrames += dropFrames;
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// Do we have more stuff to animate?
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if (this.animations.length > 0) {
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helpers.requestAnimFrame.call(window, this.digestWrapper);
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}
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}
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};
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}; |