
package { import com.flashdynamix.utils.SWFProfiler; import flash.display.Bitmap; import flash.display.BitmapData; import flash.display.PixelSnapping; import flash.display.Sprite; import flash.display.StageAlign; import flash.display.StageQuality; import flash.display.StageScaleMode; import flash.events.Event; import flash.geom.ColorTransform; import flash.geom.Point; import org.libspark.betweenas3.BetweenAS3; import org.libspark.betweenas3.easing.Back; import org.libspark.betweenas3.easing.Quart; import org.libspark.betweenas3.tweens.ITween; public class ParticleBetween extends Sprite { private static const NUM_PARTICLES:uint = 20000; private static const FADE:ColorTransform = new ColorTransform(1, 1, 1, 1, -32, -16, -16); public function ParticleBetween() { setupParticles(); setupScreen(); setupStage(); SWFProfiler.init(this); addEventListener(Event.ENTER_FRAME, enterFrameHandler); } private var _bitmapData:BitmapData; private var _bitmap:Bitmap; private var _particles:Particle; private function setupParticles():void { var prev:Particle = _particles = new Particle(); var p:Particle = null; var a:Number, dx:Number, dy:Number; var t:ITween; var i:int = NUM_PARTICLES; while (--i >= 0) { a = Math.random() * Math.PI * 2; dx = Math.cos(a) * 465 + 465 / 2; dy = Math.sin(a) * 465 + 465 / 2; p = new Particle(); p.p.x = 465 / 2; p.p.y = 465 / 2; t = BetweenAS3.tween(p.p, {x: dx, y: dy}, null, 1.5 + Math.random() * 4.5, Quart.easeIn); t.stopOnComplete = false; t.play(); prev.next = p; prev = p; } } private function setupScreen():void { _bitmapData = new BitmapData(465, 465, false, 0x000000); _bitmap = addChild(new Bitmap(_bitmapData, PixelSnapping.NEVER, false)) as Bitmap; } private function setupStage():void { stage.frameRate = 60; stage.quality = StageQuality.LOW; stage.scaleMode = StageScaleMode.NO_SCALE; stage.align = StageAlign.TOP_LEFT; stage.addEventListener(Event.RESIZE, resizeHandler); resizeHandler(null); } private function resizeHandler(e:Event):void { _bitmap.x = Math.floor((stage.stageWidth - 465) / 2); _bitmap.y = Math.floor((stage.stageHeight - 465) / 2); } private function enterFrameHandler(e:Event):void { var bitmapData:BitmapData = _bitmapData; bitmapData.lock(); bitmapData.colorTransform(_bitmapData.rect, FADE); var p:Particle = _particles; var pos:Point; while ((p = p.next) != null) { pos = p.p; bitmapData.setPixel(pos.x >> 0, pos.y >> 0, 0xffffff); } bitmapData.unlock(); } } } import flash.geom.Point; internal class Particle { public var p:Point = new Point(); public var next:Particle; }