// forked from ton's forked from: BrownianMotion // forked from ton's BrownianMotion package { import flash.display.*; import flash.events.*; import frocessing.core.F5BitmapData2D; import net.hires.debug.Stats; [SWF(frameRate="60", backgroundColor="#000000")] public class BrownianMotion extends Sprite { private const N:int = 500; private const MAX_R:int = 50; private const W:int = 465; private const H:int = 465; private var list:Vector.<Dot>; private var fg:F5BitmapData2D; function BrownianMotion() { fg = new F5BitmapData2D(W, H, false, 0xff000000); addChild( new Bitmap(fg.bitmapData) ); fg.strokeAlpha = 0.1; list = new Vector.<Dot>(N, true); for (var i:int = 0; i < N; i++) { var d:Dot = new Dot(Math.random()*0xffffff); var r:Number = Math.sqrt(Math.random()) * MAX_R; var angle:Number = Math.random() * (2 * Math.PI); d.x = Math.cos(angle) * r; d.y = Math.sin(angle) * r; d.vx = 0; d.vy = 0; list[i] = d; } //addChild( new Stats() ); addEventListener(Event.ENTER_FRAME, onEnterFrameHandler); } private function onEnterFrameHandler(event:Event):void { fg.beginDraw(); fg.translate( W>>1, H>>1 ); for (var i:int = 0; i < N; i++) { var d:Dot = list[i]; d.update(); fg.strokeColor = 0x000000; fg.pixel( d.x+1, d.y+1 ); fg.strokeColor = d.color; fg.pixel( d.x, d.y ); } fg.endDraw(); } } } class Dot{ public var vx:Number; public var vy:Number; public var x:Number; public var y:Number; public var color:uint; private const X:Number = 0.2; private const F:Number = 0.95; function Dot(color:uint) { this.color = color; } public function update():void { vx += Math.random() * X * 2 - X; vy += Math.random() * X * 2 - X; vx *= F; vy *= F; x += vx; y += vy; } }