AS3.0 图片自适应效果实例

效果演示：（IE8下可正常浏览）
下载地址：/Files/zhoujunfeng2011/SWF/Test.swf 各位朋友可下载到本地进行缩放窗口进行测试！ 源码： Main.as: package { import flash.display.Sprite; import flash.display.Loader; import flash.events.Event; import flash.net.URLRequest; import flash.display.Bitmap; import flash.events.MouseEvent; import flash.text.TextField; import flash.text.TextFormat; import flash.display.StageScaleMode; import flash.display.Shape; import Effters.loading; import flash.events.IOErrorEvent; public class Main extends Sprite { //首次加载的图片url private var url:String = "http://******????????"; //后续加载的图片url private var _URL:String = "http://******??????"; private var _URL2:String = ".*????????"; private var LoadURL:String; private var loader:Loader; private var test:Sprite = new Sprite(); private var stage_width:Number; private var stage_height:Number; private var test_width:Number; private var test_height:Number; private var _X:TextField = new TextField(); private var _Y:TextField = new TextField(); private var _W:TextField = new TextField(); private var _H:TextField = new TextField(); private var _RECT:TextField = new TextField(); private var _F:TextFormat = new TextFormat(); private var ErrorText:TextField = new TextField(); private var rect:Shape = new Shape(); private var loadingeffters:loading; private var upbtn:Sprite; private var downbtn:Sprite; private var index:int = 0; public function Main():void { init(); } private function init():void { stage.scaleMode = StageScaleMode.NO_SCALE; stage_width = this.stage.stageWidth; stage_height = this.stage.stageHeight; rect.graphics.beginFill(0xffff00,0.6); rect.graphics.drawRect(0,0,20,20); rect.graphics.endFill(); addChild(rect); rect.y = this.stage.stageHeight - rect.height; _F.color = 0xffffff; _F.size = 14; _X.text = "鼠标X轴:" + "0"; _Y.text = "鼠标Y轴:" + "0"; _W.text = "当前舞台宽度:" + this.stage.stageWidth; _H.text = "当前舞台高度:" + this.stage.stageHeight; _RECT.text = "方块X、Y:" + rect.x + "," + rect.y; _X.setTextFormat(_F); _Y.setTextFormat(_F); _W.setTextFormat(_F); _H.setTextFormat(_F); _RECT.setTextFormat(_F); addChild(_X); addChild(_Y); addChild(_W); addChild(_H); addChild(_RECT); _X.y = 10; _Y.y = 30; _W.y = 50; _H.y = 70; _RECT.y = 90; _X.height = 20; _Y.height = 20; _W.height = 20; _H.height = 20; _RECT.height = 20; _W.width = 150; _H.width = 150; _RECT.width = 150; upbtn = Draws(40,15,6,0xFF99FF); downbtn = Draws(40,15,6,0xFFCCFF); //添加按钮 addChild(downbtn); downbtn.x = rect.x + 25; downbtn.y = this.stage.stageHeight - 20; downbtn.buttonMode = true; addChild(upbtn); upbtn.x = downbtn.x + 45; upbtn.y = downbtn.y; upbtn.buttonMode = true; var upbtntext:TextField = new TextField(); var downbtntext:TextField = new TextField(); upbtntext.text = "下一张"; upbtntext.width = 40; downbtntext.text = "上一张"; downbtntext.width = 40; upbtn.addChild(upbtntext); downbtn.addChild(downbtntext); upbtntext.y = downbtntext.y = -2; upbtntext.selectable = downbtntext.selectable = false; upbtntext.mouseEnabled = downbtntext.mouseEnabled = false; //监听舞台改变尺寸事件 this.stage.addEventListener(Event.RESIZE,ReSizeHalder); //监听鼠标移动事件; this.stage.addEventListener(MouseEvent.MOUSE_MOVE,MoveHalder); //监听鼠标点击按钮事件; upbtn.addEventListener(MouseEvent.CLICK,up_click); downbtn.addEventListener(MouseEvent.CLICK,down_click); ErrorText.y = 110; ErrorText.height = 20; ErrorText.width = 200; ErrorText.textColor = 0xffffff; loader = new Loader(); loader.contentLoaderInfo.addEventListener(Event.COMPLETE,com); loader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR,error); loader.load(new URLRequest(url)); ErrorText.text = "图片加载中..."; addChild(ErrorText); //添加loading效果 loadingeffters = new loading(); addChild(loadingeffters); loadingeffters.x = stage.stageWidth / 3.5; loadingeffters.y = stage.stageHeight / 3.5; } private function error(evt:IOErrorEvent):void { removeChild(loadingeffters); ErrorText.textColor = 0xFF0000; ErrorText.text = "图片加载失败"; loader.unload(); loader = null; } private function com(evt:Event):void { //移除loader监听事件 ErrorText.text = ""; loader.contentLoaderInfo.removeEventListener(Event.COMPLETE,com); loader.contentLoaderInfo.removeEventListener(IOErrorEvent.IO_ERROR,error); //加载完成，移除loading效果; removeChild(loadingeffters); //显示图片等 var bitmap:Bitmap = Bitmap(loader.content); test.addChild(bitmap); test_width = test.width; test_height = test.height; addChild(test); //设置图片大小位置 setvideosize(test,stage_width,stage_height,this.stage.stageWidth,this.stage.stageHeight,test_width,test_height); loader.unload(); loader = null; } private function MoveHalder(evt:MouseEvent):void { _X.text = "鼠标X轴:" + this.mouseX; _Y.text = "鼠标Y轴:" + this.mouseY; _X.setTextFormat(_F); _Y.setTextFormat(_F); } private function ReSizeHalder(evt:Event):void { rect.x = (stage_width - this.stage.stageWidth)/2; rect.y = (stage_height - this.stage.stageHeight)/2 + this.stage.stageHeight - rect.height; downbtn.x = (stage_width - this.stage.stageWidth)/2 + 25; downbtn.y = (stage_height - this.stage.stageHeight)/2 + this.stage.stageHeight - 20; upbtn.x = downbtn.x + 45; upbtn.y = downbtn.y; if (loadingeffters.parent != true) { loadingeffters.x = this.stage.stageWidth / 3.5; loadingeffters.y = this.stage.stageHeight / 3.5; } _W.text = "当前舞台宽度:" + this.stage.stageWidth; _H.text = "当前舞台高度:" + this.stage.stageHeight; _RECT.text = "方块X、Y:" + rect.x + "," + rect.y; _W.setTextFormat(_F); _H.setTextFormat(_F); _RECT.setTextFormat(_F); setvideosize(test,stage_width,stage_height,this.stage.stageWidth,this.stage.stageHeight,test_width,test_height); } private function setvideosize(video:Sprite,stage_width:Number,stage_height:Number,StageWidth:Number,StageHeight:Number,loadvideowidth:Number, loadvideoheight:Number):void { if ((loadvideowidth / loadvideoheight) > (StageWidth / StageHeight)) { video.width = StageWidth; video.height = StageWidth / (loadvideowidth / loadvideoheight); video.x = (stage_width - StageWidth)/2; video.y = (stage_height - StageHeight)/2 + Math.abs((StageHeight - video.height)/2); } else if ((loadvideowidth / loadvideoheight) < (StageWidth / StageHeight)) { video.height = StageHeight; video.width = StageHeight * (loadvideowidth / loadvideoheight); video.x = (stage_width - StageWidth)/2 + (Math.abs(StageWidth - video.width)/2); video.y = (stage_height - StageHeight)/2; } else if ((loadvideowidth / loadvideoheight) == (StageWidth / StageHeight)) { video.width = StageWidth; video.height = StageHeight; video.x = (stage_width - StageWidth)/2; video.y = (stage_height - StageHeight)/2; } } private function Draws(drawwidth:Number,drawheight:Number,ellipseWidth:Number,colors:uint):Sprite { var drawsprite:Sprite = new Sprite(); drawsprite.graphics.beginFill(colors,0.8); drawsprite.graphics.drawRoundRect(0,0,drawwidth,drawheight,ellipseWidth); drawsprite.graphics.endFill(); return drawsprite; } private function up_click(evt:MouseEvent):void { if (loader == null) { index--; if (index < 1) { index = 26; } loadpictures(); } } private function down_click(evt:MouseEvent):void { if (loader == null) { index++; if (index > 26) { index = 1; } loadpictures(); } } private function loadpictures():void { LoadURL = _URL + index + _URL2; loader = new Loader(); loader.contentLoaderInfo.addEventListener(Event.COMPLETE,piccom); loader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR,error); loader.load(new URLRequest(LoadURL)); ErrorText.textColor = 0xffffff; ErrorText.text = "图片加载中..."; //添加loading特效 if (loadingeffters.parent == null) { addChild(loadingeffters); } } private function piccom(evt:Event):void { ErrorText.text = ""; loader.contentLoaderInfo.removeEventListener(Event.COMPLETE,piccom); loader.contentLoaderInfo.removeEventListener(IOErrorEvent.IO_ERROR,error); if (loadingeffters.parent != null) { removeChild(loadingeffters); } var bitmap:Bitmap = Bitmap(loader.content); if (test.numChildren != 0) { test.removeChildAt(0); } this.addChildAt(test,this.parent.numChildren -1); test.addChild(bitmap); test_width = test.width; test_height = test.height; setvideosize(test,stage_width,stage_height,this.stage.stageWidth,this.stage.stageHeight,test_width,test_height); if (loader != null) { loader.unload(); loader = null; } } } }
loading效果，可以在我前面发的几篇文章中查看，以上效果仅供参考...

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