AS3.0实现图像的扭曲

 1 import flash.display.Sprite;
 2 import flash.display.Loader;
 3 import flash.net.URLRequest;
 4 import flash.events.Event;
 5 import flash.display.Bitmap;
 6 import flash.display.BitmapData;
 7 
 8 var pixelsArr : Array;
 9 var loader : Loader;
10 var url : String;
11 var bitMap : Bitmap;
12 var outPut : Bitmap;
13 var outPutData : BitmapData;
14 
15 init("imag.jpg");
16 
17 function draw(source:BitmapData, w:Number, h:Number, topLen:Number ):BitmapData 
18 {
19     outPutData=new BitmapData(1024,768,true, 0x000000);
20     var tanA : Number=(h - topLen) / w;
21     var tmpHeight:Number;
22     for (var i:uint=0; i < w; i++)
23     {
24         tmpHeight = topLen + i*tanA;
25         for (var k:uint=0; k < tmpHeight; k++)
26         {
27             outPutData.setPixel32(i, k + (h - tmpHeight) / 2, source.getPixel32(i*(source.width/w), k*(source.height / tmpHeight)));
28         }
29     }
30     return outPutData;
31 }
32 
33 function init(strURL:String):void
34 {
35     loader = new Loader();
36     loader.contentLoaderInfo.addEventListener(Event.COMPLETE, onPicLoaded);
37     loader.load(new URLRequest(strURL));
38     
39 }
40 
41 function onPicLoaded(evt : Event):void 
42 {
43     addChild(loader);
44     loader.x = 10
45     loader.y = 10
46     loader.width=300;
47     loader.height=200;
48     
49     pixelsArr = new Array();
50     var $loader : Loader = Loader(evt.target.loader);
51     bitMap = Bitmap($loader.content);
52     var $bitmapData: BitmapData = bitMap.bitmapData;
53     outPut = new Bitmap(draw($bitmapData, 200, 500, 160));
54     outPut.y = 100;
55     outPut.x = 310
56     addChild(outPut);
57 }