diff --git a/src/Chart.Core.js b/src/Chart.Core.js index f6a6995be..d0a70336d 100755 --- a/src/Chart.Core.js +++ b/src/Chart.Core.js @@ -915,7 +915,7 @@ }, stop : function(){ // Stops any current animation loop occuring - cancelAnimFrame(this.animationFrame); + Chart.animationService.cancelAnimation(this); return this; }, resize : function(callback){ @@ -939,15 +939,26 @@ if (reflow){ this.reflow(); } + if (this.options.animation && !reflow){ - helpers.animationLoop( - this.draw, - this.options.animationSteps, - this.options.animationEasing, - this.options.onAnimationProgress, - this.options.onAnimationComplete, - this - ); + var animation = new Chart.Animation(); + animation.numSteps = this.options.animationSteps; + animation.easing = this.options.animationEasing; + + // render function + animation.render = function(chartInstance, animationObject) { + var easingFunction = helpers.easingEffects[animationObject.easing]; + var stepDecimal = animationObject.currentStep / animationObject.numSteps; + var easeDecimal = easingFunction(stepDecimal); + + chartInstance.draw(easeDecimal, stepDecimal, animationObject.currentStep); + }; + + // user events + animation.onAnimationProgress = this.options.onAnimationProgress; + animation.onAnimationComplete = this.options.onAnimationComplete; + + Chart.animationService.addAnimation(this, animation); } else{ this.draw(); @@ -1354,6 +1365,16 @@ } }); + Chart.Animation = Chart.Element.extend({ + currentStep: null, // the current animation step + numSteps: 60, // default number of steps + easing: "", // the easing to use for this animation + render: null, // render function used by the animation service + + onAnimationProgress: null, // user specified callback to fire on each step of the animation + onAnimationComplete: null, // user specified callback to fire when the animation finishes + }); + Chart.Tooltip = Chart.Element.extend({ draw : function(){ @@ -2059,6 +2080,90 @@ } }); + Chart.animationService = { + frameDuration: 17, + animations: [], + dropFrames: 0, + addAnimation: function(chartInstance, animationObject) { + for (var index = 0; index < this.animations.length; ++ index){ + if (this.animations[index].chartInstance === chartInstance){ + // replacing an in progress animation + this.animations[index].animationObject = animationObject; + return; + } + } + + this.animations.push({ + chartInstance: chartInstance, + animationObject: animationObject + }); + + // If there are no animations queued, manually kickstart a digest, for lack of a better word + if (this.animations.length == 1) { + helpers.requestAnimFrame.call(window, this.digestWrapper); + } + }, + // Cancel the animation for a given chart instance + cancelAnimation: function(chartInstance) { + var index = helpers.findNextWhere(this.animations, function(animationWrapper) { + return animationWrapper.chartInstance === chartInstance; + }); + + if (index) + { + this.animations.splice(index, 1); + } + }, + // calls startDigest with the proper context + digestWrapper: function() { + Chart.animationService.startDigest.call(Chart.animationService); + }, + startDigest: function() { + + var startTime = Date.now(); + var framesToDrop = 0; + + if(this.dropFrames > 1){ + framesToDrop = Math.floor(this.dropFrames); + this.dropFrames -= framesToDrop; + } + + for (var i = 0; i < this.animations.length; i++) { + + if (this.animations[i].animationObject.currentStep === null){ + this.animations[i].animationObject.currentStep = 0; + } + + this.animations[i].animationObject.currentStep += 1 + framesToDrop; + if(this.animations[i].animationObject.currentStep > this.animations[i].animationObject.numSteps){ + this.animations[i].animationObject.currentStep = this.animations[i].animationObject.numSteps; + } + + this.animations[i].animationObject.render(this.animations[i].chartInstance, this.animations[i].animationObject); + + if (this.animations[i].animationObject.currentStep == this.animations[i].animationObject.numSteps){ + // executed the last frame. Remove the animation. + this.animations.splice(i, 1); + // Keep the index in place to offset the splice + i--; + } + } + + var endTime = Date.now(); + var delay = endTime - startTime - this.frameDuration; + var frameDelay = delay / this.frameDuration; + + if(frameDelay > 1){ + this.dropFrames += frameDelay; + } + + // Do we have more stuff to animate? + if (this.animations.length > 0){ + helpers.requestAnimFrame.call(window, this.digestWrapper); + } + } + }; + // Attach global event to resize each chart instance when the browser resizes helpers.addEvent(window, "resize", (function(){ // Basic debounce of resize function so it doesn't hurt performance when resizing browser.