[ActionScript 3.0] 利用InteractivePNG.as类精确选择识别png图片有像素的区域

用法：如果是把png直接导入flash转换成影片剪辑，只需在影片剪辑属性中勾选为ActionScript导出(x)，并把基类里的flash.display.MovieClip替换成InteractivePNG即可；如果是外部导入png，只需将存放png的类继承InteractivePNG即可；

 package
 {
     import flash.display.Loader;
     import flash.display.MovieClip;
     import flash.display.Shape;
     import flash.display.Sprite;
     import flash.events.Event;
     import flash.events.MouseEvent;
     import flash.filters.DropShadowFilter;
     import flash.net.URLRequest;

     /**
       * ...
       * @author Frost.Yen
       */
     public class TestPNG extends Sprite
     {
         private var pngSp:PNGContainer;
         private var ldr:Loader = new Loader  ;
         private var lineSp:Sprite;
         private var frame:Shape = new Shape  ;
         public function TestPNG()
         {

             lineSp = new Sprite  ;
             pngSp = new PNGContainer  ;
             pngSp.x = pngSp.y = 200;
             this.addChild(lineSp);
             this.addChild(pngSp);
             pngSp.addEventListener(MouseEvent.MOUSE_OVER,onPNGOver);
             pngSp.addEventListener(MouseEvent.MOUSE_OUT,onPNGOut);
         }

         private function onPNGOver(e:MouseEvent):void
         {
             drawLine(pngSp);
         }

         private function onPNGOut(e:MouseEvent):void
         {
             this.removeChild(frame);
         }

         private function drawLine(_mc:MovieClip)
         {
             frame.graphics.clear();
             frame.graphics.moveTo(_mc.x,_mc.y);
             frame.graphics.lineStyle(1,0xff00ff);
             frame.graphics.lineTo(_mc.x + _mc.width,_mc.y);
             frame.graphics.moveTo(_mc.x + _mc.width,_mc.y);
             frame.graphics.lineTo(_mc.x + _mc.width,_mc.y + _mc.height);
             frame.graphics.moveTo(_mc.x + _mc.width,_mc.y + _mc.height);
             frame.graphics.lineTo(_mc.x,_mc.y + _mc.height);
             frame.graphics.moveTo(_mc.x,_mc.y + _mc.height);
             frame.graphics.lineTo(_mc.x,_mc.y);
             addChild(frame);
         }
     }
 }

 package
 {
     import flash.display.Loader;
     import flash.events.Event;
     import flash.net.URLRequest;

     /**
       * ...
       * @author Frost.Yen
       */
     public class PNGContainer extends InteractivePNG
     {
         private var ldr:Loader = new Loader  ;
         public function PNGContainer()
         {
             ldr.load(new URLRequest("128.png"));
             ldr.contentLoaderInfo.addEventListener(Event.COMPLETE,onPNGLoaded);
         }

         private function onPNGLoaded(e:Event):void
         {
             this.addChild(e.target.content);
         }
     }

 }

InteractivePNG.as类可以到http://yan_frost.download.csdn.net/下载