利用 BitmapData 类和 Bitmap 类打造像素点渐现的效果, 纯AS代码. 不错. 请看效果, 如果想重看效果, 就刷新本页一次:

源文件: 压缩包下载

package {
    import  flash.display.MovieClip;
    import  flash.display.BitmapData;
    import  flash.display.Bitmap;
    import  flash.display.Loader;
    import  flash.net.URLLoader;
    import  flash.events.Event;
    import  flash.net.URLRequest;
    import  flash.geom.Matrix;
    import  flash.utils.Timer;
    import  flash.events.TimerEvent;
    import  flash.geom.Rectangle;
    import  flash.geom.Point;
 
    public  class DisplayList extends MovieClip {
      
       private  var _bitmapData:BitmapData;
       private  var _temporaryBitmapData:BitmapData;
       private  var _loader:Loader;
       private  var _timer:Timer;
       private  var _randomValue:uint;
      
       public  function DisplayList() {
           var bitmapData:BitmapData = new BitmapData(250, 200, true, 0xFFFFFF);
           var bitmap:Bitmap = new Bitmap(bitmapData);
           addChild(bitmap);
           _bitmapData = bitmapData;
           _loader = new Loader();
           _loader.contentLoaderInfo.addEventListener(Event.COMPLETE,onLoad);
           var request:URLRequest = new URLRequest("http://www.rightactionscript.com/samplefiles/image2.jpg");
           _loader.load(request);
           _temporaryBitmapData = new BitmapData(250, 200, true, 0xFFFFFF);
       }
      
       private  function onLoad(event:Event):void{
           _temporaryBitmapData.draw(_loader, new Matrix(.5, 0, 0, .5));
           _timer = new Timer(50, 50);
           _timer.addEventListener(TimerEvent.TIMER, onTimer);
           _timer.start();
           _randomValue = 0;
       }
      
       private  function onTimer(event:TimerEvent):void{
          _randomValue = _bitmapData.pixelDissolve(_temporaryBitmapData, new Rectangle(0, 0, 250, 200), new Point(0, 0), _randomValue, 250 * 200 / 50);
       }
       
    }
}