flash鼠标拖尾粒子效果怎么制作? flash粒子拖尾代

var color:uint=0;
var speed:Number=0;
var i:Number=0;
var rad:Number=0;
var boxPar:Shape;
function initView(_color:uint,_rad:Number):void
{
color=_color;
speed=2;
rad=_rad;
AddParicle();
this.addEventListener(Event.ENTER_FRAME,UpdateView);
}
function AddParicle():void
{
boxPar=new Shape();
addChild(boxPar);
boxPar.graphics.beginFill(color,1);
boxPar.graphics.drawCircle(0,0,rad);
boxPar.graphics.endFill();
}
function UpdateView(e:Event):void
{
boxPar.x+=2;
boxPar.alpha-=0.05;
if(boxPar.alpha<0.01)
{
this.removeEventListener(Event.ENTER_FRAME,UpdateView);
this["parent"].removeChild(this);
}
}

var maxNum:int=3;
var mcAry:Array=new Array();
stage.addEventListener(MouseEvent.MOUSE_MOVE,MouseMoveEvent);
function MouseMoveEvent(e:MouseEvent):void
{
for(var i=0;i<maxNum;i++)
{
var color:uint=Math.random()0xffffff;
mcAry.push(new Pflashs());
addChild(mcAry[mcAry.length-1]);
mcAry[mcAry.length-1].initView(color,Math.random()5);
mcAry[mcAry.length-1].x=this.mouseX;
mcAry[mcAry.length-1].y=this.mouseY;
mcAry[mcAry.length-1].rotation=Math.random()360;
}
}