CD 技能特效

package
{
    import flash.display.Bitmap;
    import flash.display.Loader;
    import flash.display.LoaderInfo;
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.net.URLRequest;
 
    public class CDTimeSample extends Sprite
    {
        private var cdMask :CDMask;
        public function CDTimeSample()
        {
            init();
        }
        private function init():void
        {
            loadImg();
        }
        private function loadImg():void
        {
            var imgLoader :Loader = new Loader();
            var url:String = "1.png";
            imgLoader.contentLoaderInfo.addEventListener(Event.COMPLETE,imgLoaderHandler);
            imgLoader.load(new URLRequest(url));
        }
        private function imgLoaderHandler(e:Event):void
        {
            var imgBMP :Bitmap = (((e.target) as LoaderInfo).content as Bitmap);
            cdMask = new CDMask(imgBMP.bitmapData);
            addChild(cdMask);
        }
    }
}

package
{
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.display.Shape;
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.events.MouseEvent;
    import flash.filters.ColorMatrixFilter;
    import flash.utils.getTimer;
    import flash.geom.Matrix;
    import flash.sampler.getSize;

    /**
     *冷却时间遮罩类
     **/
    public class CDMask extends Sprite
    {
        private var icon :Shape;                    //图标
        private var cdMask :Sprite;                    //冷却时间遮罩            
        private var currentAngle :Number;            //当前的角度
        private var speed :Number;                    //CD时间速度
        private var radius :Number;                    //遮罩半径
        //private var background :Bitmap;                //背景图
        private var startTime :Number;                //开始时间
        private var totalTime :Number = 500;        //CD冷却时间，1秒
        
        private function drawBitmap(bgshape:Shape,bmp:BitmapData,_alpha:Number = 1.0):void
        {
            bgshape.graphics.beginBitmapFill(bmp);
            bgshape.graphics.drawRect(0, 0, bmp.width, bmp.height);
            bgshape.graphics.endFill();
            bgshape.alpha = _alpha;
        }
        
        public function CDMask(BMD :BitmapData)
        {
            super();
            var bg:Shape = new Shape();
            drawBitmap(bg,BMD,0.2);
            addChild(bg);

            this.icon =    new Shape();    // new Bitmap(BMD);
            drawBitmap(icon,BMD,1.0);
            addChild(icon);
            /*
            var background:Bitmap = new Bitmap(BMD);
            //this.background.filters = [new ColorMatrixFilter([1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,0,0,0,1,0])]; //灰色滤镜数组
            background.alpha = 0.2;
            addChild(background);
            trace(getSize(bgshape),getSize(background));
            */
            
            
            this.addEventListener(MouseEvent.CLICK, startCDHandler);
        }
        private function startCDHandler(e:MouseEvent):void 
        {
            startTime = getTimer();                //开始获取时间
            cdMask = new Sprite();
            this.addChild(cdMask);
            icon.mask = cdMask;
            currentAngle = 0;
            speed = 1;
            radius = Math.sqrt(this.width/2 * this.width/2 + this.height/2 * this.height/2);        //遮罩半径，勾股定理，你们都懂的
            cdMask.x = this.width/2;
            cdMask.y = this.height/2;
 
            cdMask.graphics.beginFill(0);
            cdMask.graphics.lineTo(radius,0);
            cdMask.addEventListener(Event.ENTER_FRAME , efHandler);
            removeEventListener(MouseEvent.CLICK,startCDHandler);
        }
        private function efHandler(e:Event):void 
        {
            var postTime :Number = getTimer() - startTime;        //程序运行到这里的时间-开始的时间
            currentAngle += speed;
            if(postTime <= totalTime)
            {
                var currAngle:Number = 2 * Math.PI * ( postTime / totalTime );//根据经过时间算出弧度
                var toX :Number = radius * Math.cos(currAngle);
                var toY :Number = radius * Math.sin(currAngle);
                cdMask.graphics.lineTo(toX,toY);
            }
            else
            {
                if (this.contains(cdMask)) 
                {
                    this.removeChild(cdMask);
                    icon.mask = null;
                    this.addEventListener(MouseEvent.CLICK, startCDHandler);
                    removeEventListener(Event.ENTER_FRAME, efHandler);
                }
            }
        }
    }
}