[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；

 1 package 

 2 {

 3     import flash.display.Loader;

 4     import flash.display.MovieClip;

 5     import flash.display.Shape;

 6     import flash.display.Sprite;

 7     import flash.events.Event;

 8     import flash.events.MouseEvent;

 9     import flash.filters.DropShadowFilter;

10     import flash.net.URLRequest;

11 

12     /**

13       * ...

14       * @author Frost.Yen

15       */

16     public class TestPNG extends Sprite

17     {

18         private var pngSp:PNGContainer;

19         private var ldr:Loader = new Loader  ;

20         private var lineSp:Sprite;

21         private var frame:Shape = new Shape  ;

22         public function TestPNG()

23         {

24 

25             lineSp = new Sprite  ;

26             pngSp = new PNGContainer  ;

27             pngSp.x = pngSp.y = 200;

28             this.addChild(lineSp);

29             this.addChild(pngSp);

30             pngSp.addEventListener(MouseEvent.MOUSE_OVER,onPNGOver);

31             pngSp.addEventListener(MouseEvent.MOUSE_OUT,onPNGOut);

32         }

33 

34         private function onPNGOver(e:MouseEvent):void

35         {

36             drawLine(pngSp);

37         }

38 

39         private function onPNGOut(e:MouseEvent):void

40         {

41             this.removeChild(frame);

42         }

43 

44         private function drawLine(_mc:MovieClip)

45         {

46             frame.graphics.clear();

47             frame.graphics.moveTo(_mc.x,_mc.y);

48             frame.graphics.lineStyle(1,0xff00ff);

49             frame.graphics.lineTo(_mc.x + _mc.width,_mc.y);

50             frame.graphics.moveTo(_mc.x + _mc.width,_mc.y);

51             frame.graphics.lineTo(_mc.x + _mc.width,_mc.y + _mc.height);

52             frame.graphics.moveTo(_mc.x + _mc.width,_mc.y + _mc.height);

53             frame.graphics.lineTo(_mc.x,_mc.y + _mc.height);

54             frame.graphics.moveTo(_mc.x,_mc.y + _mc.height);

55             frame.graphics.lineTo(_mc.x,_mc.y);

56             addChild(frame);

57         }

58     }

59 }

 1 package 

 2 {

 3     import flash.display.Loader;

 4     import flash.events.Event;

 5     import flash.net.URLRequest;

 6 

 7     /**

 8       * ...

 9       * @author Frost.Yen

10       */

11     public class PNGContainer extends InteractivePNG

12     {

13         private var ldr:Loader = new Loader  ;

14         public function PNGContainer()

15         {

16             ldr.load(new URLRequest("128.png"));

17             ldr.contentLoaderInfo.addEventListener(Event.COMPLETE,onPNGLoaded);

18         }

19 

20         private function onPNGLoaded(e:Event):void

21         {

22             this.addChild(e.target.content);

23         }

24     }

25 

26 }

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