ActionScript 3.0 学习(五) AS3 Losder加载图片以及显示对象遮罩介绍

package
{
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.display.Loader;
import flash.display.Sprite;
import flash.events.Event;
import flash.filters.BitmapFilterQuality;
import flash.filters.BlurFilter;
import flash.net.URLRequest;

public class BitmapLearn extends Sprite
{
private var _bitmap:Bitmap;
private var _circleMask:Sprite;
public function BitmapLearn()
{
initMask();
startLoadImg();
}

private function initMask():void
{
_circleMask = new Sprite();
_circleMask.graphics.beginFill(0xff0000);
_circleMask.graphics.drawCircle(60, 60, 60);
_circleMask.graphics.endFill();

_circleMask.filters = [new BlurFilter(20, 20, BitmapFilterQuality.HIGH)];
_circleMask.cacheAsBitmap = true;

addChild(_circleMask);
_circleMask.startDrag(true);
}

private function loaded(evt:Event):void
{
_bitmap = evt.target.content as Bitmap;
addChild(_bitmap);
_bitmap.cacheAsBitmap = true;
_bitmap.mask = _circleMask;
//addChild(evt.target.content);
}

private function startLoadImg():void
{
var loader:Loader = new Loader();
var request:URLRequest = new URLRequest("tupian.jpg");                 //("C:/Users/xxx/Desktop/tupian.jpg")   注意此处为反斜线
loader.load(request);
loader.contentLoaderInfo.addEventListener(Event.COMPLETE, loaded);     // LoaderInfo 对象提供有关加载的文件的加载进度信息和统计。
}
}
}