像素融解

import flash.display.BitmapData;
import flash.display.Bitmap;
import flash.geom.Point;
import flash.geom.Rectangle;
import flash.utils.Timer;
import flash.events.TimerEvent;

var rndColor: int = Math.random() * 0xffffffff; //随机背景色
var fillColor: int = Math.random() * 0xffffffff; //随机填充色

var bmd: BitmapData = new BitmapData(100,
	100,
	false,
	rndColor);
var bitmap: Bitmap = new Bitmap(bmd);
addChild(bitmap);

bitmap.scaleX = bitmap.scaleY = 1.5;
bitmap.x = stage.stageWidth / 2 -
	bitmap.width / 2;
bitmap.y = stage.stageHeight / 2 -
	bitmap.height / 2;

var tim: Timer = new Timer(20);
tim.start();
tim.addEventListener(TimerEvent.TIMER,
	timerHandler);

function timerHandler(event: TimerEvent): void {
	var randomNum: Number = Math.floor(Math.random() * int.MAX_VALUE);
	dissolve(randomNum);
}

function dissolve(randomNum: Number): void {
	var rect: Rectangle = bmd.rect;
	var pt: Point = new Point(0,
		0);
	var numberOfPixels: uint = 100; //每次融解100个像素   
	bmd.pixelDissolve(bmd,
		rect, pt, randomNum, numberOfPixels, fillColor);
	var grayRegion: Rectangle = bmd.getColorBoundsRect(0xFFFFFFFF,
		rndColor, true);

	if (grayRegion.width == 0 &&
		grayRegion.height == 0) {
		bmd.dispose();
		rndColor = Math.random() * 0xffffffff;
		fillColor = Math.random() * 0xffffff;
		bmd = new BitmapData(100,
			100,
			false,
			rndColor);
		bitmap.bitmapData = bmd;

		//tim.stop();
	}
}