分享一个Image类，里面有一图片切割,clone,等一些方法

一个as3的Image类，里面加了个clone,图片切割，放大，缩小等功能！package chessGame.vo { import flash.display.Bitmap; import flash.display.Loader; import flash.display.Sprite; import flash.events.*; import flash.geom.Point; import flash.geom.Rectangle; import flash.net.URLRequest; import flash.display.BitmapData; import flash.display.IBitmapDrawable; public class Image extends Sprite { private var _url:*; private var _loader:Loader; private var _id:int; private var _canShow:Boolean=false; private var _isLoaded:Boolean=true; private var _s:ChessGame; private var _x:int; private var _y:int; public var _bitmap:Bitmap=null; public function Image(usrs:*=null) { _url=usrs; if(_url is String) { init(); }else { if(usrs!=null) { _bitmap=new Bitmap(usrs.bitmapData); this.addChild(_bitmap); } } } private function init():void { if(_url!=null){ _loader = new Loader(); var request:URLRequest = new URLRequest(_url); _loader.load(request); configureListeners(_loader.contentLoaderInfo); } } private function configureListeners(dispatcher:IEventDispatcher):void { dispatcher.addEventListener(Event.COMPLETE, completeHandler); //加载完成 dispatcher.addEventListener(IOErrorEvent.IO_ERROR, ioErrorHandler); } private function removeListeners(dispatcher:IEventDispatcher):void { dispatcher.removeEventListener(Event.COMPLETE, completeHandler); //加载完成 dispatcher.removeEventListener(IOErrorEvent.IO_ERROR, ioErrorHandler); } private function completeHandler(event:Event):void { _bitmap = Bitmap(event.target.content); addChild(_bitmap); _canShow=true; trace(this._url+"加载完成! "); if(_loader!=null) removeListeners(_loader.contentLoaderInfo); ChessGame.instance.upSorceNum(); } private function ioErrorHandler(event:IOErrorEvent):void { trace("ioErrorHandler: " + event); } public function get id():int{ return _id; } public function set id(i:int):void { this._id=i; } public function get url():* { return _url; } public function unLoad():void { if(_bitmap!=null) { if(this.contains(_bitmap)) this.removeChild(_bitmap); _bitmap.bitmapData.dispose(); _bitmap=null; } } public function get bitmap():Bitmap { return _bitmap; } //克隆副本 public function clone():Image { var img:Image; if(_bitmap!=null) { img=new Image(); var b:Bitmap=new Bitmap(_bitmap.bitmapData.clone()); img.addChild(b); img._bitmap=b; img._url=this._url; }else{ img=new Image(this._url); } return img; } public function smallClone(x:int=0,y:int=0,w:int=14,h:int=28,px:int=0,py:int=0):Image { var img:Image; if(_bitmap!=null) { img=new Image(); var b:Bitmap=new Bitmap(); b.bitmapData=new BitmapData(w,h); var rect:Rectangle = new Rectangle(x, y, w, h); var pt:Point = new Point(px, py); b.bitmapData.copyPixels(_bitmap.bitmapData, rect, pt); img._bitmap=b; img._url=this._url; img.addChild(b); }else{ img=new Image(this._url); } return img; } public static function getResizeBD(source : *,w : int,h : int) : BitmapData { if(!source is IBitmapDrawable)return null; if(source.width == w && source.height == h)return source; var a : Number = w / source.width; var d : Number = h / source.height; var mtx : Matrix = new Matrix(a, 0, 0, d, 0, 0); var target : BitmapData = new BitmapData(w, h, true, 0); target.draw(source, mtx, null, null, null, true); return target; } } }