忽略PNG透明區域的事件(AS/Flash)

此文出現源於忽略PNG透明區域的事件(Flex)...
下面是純as的實現..用的是Loader..幫羣裏的朋友寫的實例
詳情的思路什麼的就不說了..看上面的地址

效果(左邊的PNGLoader加截的png忽略透明,右邊的爲普通Loader):

代碼:
PNGLoader.as

查看源碼打印關於此插件

01.package net.l4cd.display

02.{

03.    import flash.display.BitmapData;

04.    import flash.display.Loader;

05.    import flash.display.Sprite;

06.    import flash.events.Event;

07.    import flash.events.IOErrorEvent;

08.    import flash.events.ProgressEvent;

09.    import flash.geom.Matrix;

10.    import flash.net.URLRequest;

11.    import flash.system.LoaderContext;

12.    import flash.utils.ByteArray;

13.  

14.    /**

15.     * PNGLoader,主要解決png圖片透明像素處事件的問題 

16.     * @author L4cd.Net

17.     * 

18.     */ 

19.    public class PNGLoader extends Sprite

20.    {

21.        private var loader:Loader = new Loader();

22.        private var hit:Sprite = new Sprite();

23.        public function PNGLoader()

24.        {

25.            addChild(loader);

26.            addChild(hit);

27.            hit.visible = false;

28.            hit.mouseEnabled = false;

29.            mouseChildren = false;

30.            hitArea = hit;

31.            loader.contentLoaderInfo.addEventListener(Event.COMPLETE,complete);

32.            loader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR,error);

33.            loader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS,progress);

34.        }

35.        private function complete(e:Event):void

36.        {

37.            dispatchEvent(e);

38.            update();

39.        }

40.        private function error(e:IOErrorEvent):void

41.        {

42.            dispatchEvent(e);

43.        }

44.        private function progress(e:ProgressEvent):void

45.        {

46.            dispatchEvent(e);

47.        }

48.        public function load(request:URLRequest,context:LoaderContext=null):void

49.        {

50.            loader.load(request,context);

51.            clear();

52.        }

53.        public function loadBytes(bytes:ByteArray,context:LoaderContext=null):void

54.        {

55.            loader.loadBytes(bytes,context);

56.            clear();

57.        }

58.        public function unload():void

59.        {

60.            loader.unload();

61.            clear();

62.        }

63.        public function close():void

64.        {

65.            loader.close();

66.            clear();

67.        }

68.        private function clear():void

69.        {

70.            hit.graphics.clear();

71.        }

72.        private function update():void

73.        {

74.            if(!loader.content)return;

75.            var bit:BitmapData = new BitmapData(loader.width,loader.height,true,0x00000000);

76.            bit.draw(loader);

77.            //重繪圖象到bit

78.            clear();

79.            hit.graphics.beginFill(0);

80.            for(var x:uint=0;x<bit.width;x++)

81.            {

82.                for(var y:uint=0;y<bit.height;y++)

83.                {

84.                    if(bit.getPixel32(x,y))hit.graphics.drawRect(x,y,1,1);

85.                }

86.            }

87.            //以graphics畫出bit的無透明區域

88.            hit.graphics.endFill();

89.        }

90.    }

91.}

PNGLoaderExample.as

查看源碼打印關於此插件

01.package

02.{

03.    import flash.display.Loader;

04.    import flash.display.Sprite;

05.    import flash.events.MouseEvent;

06.    import flash.filters.GlowFilter;

07.    import flash.net.URLRequest;

08.      

09.    import net.l4cd.display.PNGLoader;

10.  

11.  

12.    [SWF(width="600",height="400")]

13.    /**

14.     * PNGLoaderExample 

15.     * @author L4cd.Net

16.     * 

17.     */ 

18.    public class PNGLoaderExample extends Sprite

19.    {

20.        public function PNGLoaderExample()

21.        {

22.            var pl:PNGLoader = new PNGLoader();

23.            pl.load(new URLRequest("10020601.png"));

24.            addChild(pl);

25.            pl.y = 20;

26.            pl.addEventListener(MouseEvent.ROLL_OUT,o);

27.            pl.addEventListener(MouseEvent.ROLL_OVER,o);

28.              

29.            var ld:Loader = new Loader();

30.            ld.load(new URLRequest("10020601.png"));

31.            addChild(ld);

32.            ld.x = 320;

33.            ld.y = 20;

34.            ld.addEventListener(MouseEvent.ROLL_OUT,o);

35.            ld.addEventListener(MouseEvent.ROLL_OVER,o);

36.              

37.              

38.            graphics.lineStyle(1);

39.            graphics.drawRect(20,20,250,250);

40.              

41.            graphics.drawRect(320,20,250,250);

42.        }

43.        private function o(e:MouseEvent):void

44.        {

45.            e.target.filters = (e.type == MouseEvent.ROLL_OVER)?[new GlowFilter()]:[];

46.        }

47.    }

48.}