创建一个带有模糊边缘的遮罩但是没起效果的原因 - 如果要加载模糊边缘的遮罩来遮罩显示对象, 需要将被遮罩的显示对象的cacheAsBitmap 打开
创建一个带有模糊边缘的遮罩但是没起效果的原因 - 如果要加载模糊边缘的遮罩来遮罩显示对象, 需要将被遮罩的显示对象的cacheAsBitmap 打开

package {        import flash.display.Bitmap;        import flash.display.Sprite;        import flash.events.Event;        import flash.display.Loader;        import flash.net.URLRequest;        import flash.filters.BlurFilter;        import flash.filters.BitmapFilterQuality;        public class SampleSimpleMask extends Sprite        {                private var _bitmap:Bitmap;                private var _circleMask:Sprite;                public function SampleSimpleMask()                {                        initMask();                        startLoadImg();                }                private function loaded(evt:Event):void                {                        _bitmap = evt.target.content as Bitmap;                        addChild(_bitmap);                        _bitmap.cacheAsBitmap = true;//加上这句，将缓存显示对象的内部位图表示形式                        _bitmap.mask = _circleMask;                                        }                private function initMask():void                {                        _circleMask = new Sprite();                        _circleMask.graphics.beginFill(0xFF00FF);                        _circleMask.graphics.drawCircle(60,60,200);                        _circleMask.graphics.endFill();                        _circleMask.filters = [new BlurFilter(50,50,BitmapFilterQuality.HIGH)];                        _circleMask.cacheAsBitmap = true;                        this.addChild(_circleMask);                        _circleMask.startDrag(true);                }                private function startLoadImg():void                {                        var loader:Loader = new Loader();                        var request:URLRequest = new URLRequest("a.jpg");                        loader.contentLoaderInfo.addEventListener(Event.COMPLETE,loaded);                        loader.load(request);                }        }}