水果忍者鼠标跟随特效制作[转载]

实现这效果其实比较简单，主要是思路~！

package  
{
        import flash.display.Sprite;
        import flash.events.MouseEvent;
        import flash.events.Event;
        import flash.filters.GlowFilter;

        /**
         * ...
         * @author Xing
         */
        public class Main extends Sprite 
        {
                private var _cacheX:int;
                private var _cacheY:int;
                private var _isDown:Boolean;
                private var _scene:Sprite;
                public function Main() 
                {
                        _scene = new Sprite();
                        this.addChild(_scene);
                        _scene.filters = [new GlowFilter(0x00CCFF, 1, 10, 10, 2, 1, false, false)];

                        stage.addEventListener(MouseEvent.MOUSE_DOWN, downHandler);
                        stage.addEventListener(MouseEvent.MOUSE_UP, upHandler);
                        this.addEventListener(Event.ENTER_FRAME, enterFrame);
                }
                private function downHandler(e:MouseEvent):void
                {
                        _cacheX = mouseX;
                        _cacheY = mouseY;
                        _isDown = true;
                }
                private function upHandler(e:MouseEvent):void
                {
                        _isDown = false;
                }
                private function enterFrame(e:Event):void
                {
                        for each (var l:Line in Line.sets) 
                        {
                                l.update();
                        }
                        update();
                }
                private function update():void
                {
                        if (!_isDown) return;
                        var line:Line = new Line(_cacheX, _cacheY, mouseX, mouseY);
                        _scene.addChild(line);
                        _cacheX = mouseX;
                        _cacheY = mouseY;
                }

        }

}
import flash.display.Sprite;
class Line extends Sprite
{
        static public var sets:Array = [];

        public var sX:int;
        public var sY:int;
        public var eX:int;
        public var eY:int;
        public var linesize:Number;
        public function Line($sX:int, $sY:int, $eX:int, $eY:int, $linesize:Number = 8)
        {
                sets.push(this);
                sX = $sX;
                sY = $sY;
                eX = $eX;
                eY = $eY;
                linesize = $linesize;
                draw();
        }
        private function draw():void
        {
                graphics.clear();
                graphics.lineStyle(linesize, 0xFFFFFF);
                graphics.moveTo(sX, sY);
                graphics.lineTo(eX, eY);
        }
        public function update():void
        {
                draw();
                linesize -= 1;
                if (linesize < 1)
                {
                        clear();
                }
        }
        private function clear()
        {
                graphics.clear();
                for (var i:String in sets) 
                {
                        var l:Line = sets[i] as Line;
                        if (l == this)
                        {
                                sets.splice(i, 1);
                                parent.removeChild(this);
                        }
                }
        }
}