[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