使用Flash怎么实现一个光带效果

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部分代码：

   // forked from one_truth's forked from: 光るリボン（Ribbon Light）  // forked from mousepancyo's 光るリボン（Ribbon Light）  // forked from nutsu's SketchSample6  package  {      import flash.display.Sprite;      import flash.display.BitmapData;      import flash.display.Bitmap;      import flash.events.Event;      import flash.filters.BlurFilter;      import flash.geom.Point;      import flash.geom.ColorTransfORM;            [SWF(width=465,height=465,backgroundColor=0x000000,frameRate=60)]            public class Main extends Sprite{                    private const WIDTH:Number  = 465;          private const HEIGHT:Number = 465;                    private var _sketch:CurveSketch;          private var _bmd:BitmapData;          private var _bm:Bitmap;          private var _container:Sprite = new Sprite();           public function Main() {              graphics.beginFill(0)              graphics.drawRect(0, 0, WIDTH, HEIGHT)              graphics.endFill()              addChild(_container);              //              _sketch = new CurveSketch();              _bmd = new BitmapData(WIDTH, HEIGHT, true, 0);              _container.addChild(_sketch);              _container.addChild(_bm = new Bitmap(_bmd) as Bitmap);              _bm.blendMode = "add";              //              addEventListener(Event.ENTER_FRAME, update);          }                    private function update(e:Event):void{              _bmd.draw(_sketch, null, null, "add");              _bmd.applyFilter(_bmd, _bmd.rect, new Point(), new BlurFilter(8, 8, 4));          }      }  }     //package {      import frocessing.display.F5MovieClip2D;      import frocessing.geom.FGradientMatrix;      import frocessing.color.ColorHSV            class CurveSketch extends F5MovieClip2D      {                    //加速度運動の変数          //位置          private var xx:Number;          private var yy:Number;          //速度          private var vx:Number;          private var vy:Number;          //加速度の係数          private var ac:Number;          //速度の減衰係数          private var de:Number;                    //描画座標          private var px0:Array;          private var py0:Array;          private var px1:Array;          private var py1:Array;                    private var t:Number = 0                   //描画グループ          private var shapes:Array;                    public function CurveSketch()           {                            //初期化              vx = vy = 0.0;              xx = mouseX;              yy = mouseY;              ac = 0.06;              de = 0.9;              px0 = [xx, xx, xx, xx];              py0 = [yy, yy, yy, yy];              px1 = [xx, xx, xx, xx];              py1 = [yy, yy, yy, yy];                                        shapes = [];                            //線と塗りの色指定              noStroke();                      }                    public function draw():void          {              //加速度運動              xx += vx += ( mouseX - xx ) * ac;              yy += vy += ( mouseY - yy ) * ac;                            var len:Number = mag( vx, vy );                            //新しい描画座標              var x0:Number = xx + 1 + len * 0.1;              var y0:Number = yy - 1 - len * 0.1;              var x1:Number = xx - 1 - len * 0.1;              var y1:Number = yy + 1 + len * 0.1;                            //描画座標              px0.shift(); px0.push( x0 );              py0.shift(); py0.push( y0 );              px1.shift(); px1.push( x1 );              py1.shift(); py1.push( y1 );                            var _px0:Array = [px0[0], px0[1], px0[2], px0[3]];              var _py0:Array = [py0[0], py0[1], py0[2], py0[3]];              var _px1:Array = [px1[0], px1[1], px1[2], px1[3]];              var _py1:Array = [py1[0], py1[1], py1[2], py1[3]];                            shapes.push( { px0:_px0, py0:_py0, px1:_px1, py1:_py1, mtx:null} );              if (shapes.length >= 50) shapes.shift();                            var shapesshapesLength:int = shapes.length;              for (var i:int = shapesLength-1; i >= 0; i--)               {                  var sh:Object = shapes[i];                                    var color:ColorHSV = new ColorHSV(t, 0.8, 1, 0.1)                  t += 0.05;                                    beginFill(int(color), 0.2)                  beginShape();                  curveVertex( sh.px0[0], sh.py0[0] );                  curveVertex( sh.px0[1], sh.py0[1] );                  curveVertex( sh.px0[2], sh.py0[2] );                  curveVertex( sh.px0[3], sh.py0[3] );                  vertex( sh.px1[2], sh.py1[2] );                  curveVertex( sh.px1[3], sh.py1[3] );                  curveVertex( sh.px1[2], sh.py1[2] );                  curveVertex( sh.px1[1], sh.py1[1] );                  curveVertex( sh.px1[0], sh.py1[0] );                  endShape();              }                                          //減衰処理              vx *= de;              vy *= de;          }       }  //}

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