Actionscript:
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[SWF(width = 800, height = 600)]
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var circle:Shape = new Shape();
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var radius:Number = 4;
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var diameter:Number = radius * 2;
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var diam4:Number = diameter * 4;
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with(circle.graphics) beginFill(0x000000), drawCircle(diameter,diameter,radius);
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circle.filters = [new BlurFilter(5, 5, 2)];
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var currFrame:Frame;
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// populate the linked list
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generateAnimation();
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var animationNum:int = 8000;
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var animation:Vector.<Frame> = new Vector.<Frame>();
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var locs:Vector.<Point> = new Vector.<Point>();
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// populate locs and animation
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while(animation.length <animationNum){
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currFrame = currFrame.next;
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animation.push(currFrame);
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locs.push(new Point(Math.random() * stage.stageWidth - radius,
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Math.random() * (stage.stageHeight+diam4) - diam4));
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}
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var rect:Rectangle = animation[0].bitmap.rect;
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var bottom:Number = stage.stageHeight + rect.height;
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var top:Number = -rect.height;
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var canvas:BitmapData = new
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BitmapData(stage.stageWidth,stage.stageHeight,false, 0x000000);
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addChild(new Bitmap(canvas));
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addEventListener(Event.ENTER_FRAME, onLoop);
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function onLoop(evt:Event):void {
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// clear the canvas
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canvas.fillRect(canvas.rect, 0x222222);
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// draw the current frame
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for (var i:int = 0; i<animationNum; i++){
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var ani:Frame = animation[i];
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var pnt:Point = locs[i];
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canvas.copyPixels(ani.bitmap, rect, pnt, null, null, true);
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// get the next frame of the animation
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pnt.y += 1;
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if (pnt.y> bottom){
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pnt.y = top;
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}
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animation[i] = ani.next;
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}
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}
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// generate and capture 40 bitmaps by altering the colorTransform of
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function generateAnimation():void{
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var channel:uint = 0;
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var ct:ColorTransform = new ColorTransform();
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var increase:Boolean = true;
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var firstFrame:Frame;
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var pFrame:Frame;
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for (var i:int = 0; i<40; i++){
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if (increase){
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channel += 10.25;
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if (channel> 200){
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increase = false;
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}
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}else{
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channel -= 10;
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}
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ct.color = channel <<16 | channel <<8 | channel;
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circle.transform.colorTransform = ct;
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// populate linked list
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currFrame = capture(circle);
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if (pFrame){
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pFrame.next = currFrame;
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}
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if (i == 0){
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firstFrame = currFrame;
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}
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pFrame = currFrame;
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}
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// close the list
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currFrame.next = firstFrame;
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currFrame = firstFrame;
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}
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// create the Frame instance and draw the circle to it
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// preserving the colorTransform information
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function capture(target:Shape):Frame{
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var frame:Frame = new Frame();
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frame.bitmap = new BitmapData(target.width*2, target.height*2, true, 0x000000000);
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frame.bitmap.draw(target, target.transform.matrix, target.transform.colorTransform);
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return frame;
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}
This is a variation on the last post. It captures 40 small bitmaps of a blurred circle fading in and out and then draws 8000 of them to the stage.
