[ActionScript 3.0] AS3.0 下雨及涟漪效果

帧代码：

stage.frameRate = 80;function init(x1:Number,y1:Number)
{var mc:MovieClip=new MovieClip();addChild(mc);mc.x = x1;mc.y = y1;mc.graphics.lineStyle(0.5,0xbbffff,0.6);mc.graphics.drawEllipse(-1,-0.3,2,0.6);mc.addEventListener(Event.ENTER_FRAME,frame);var v0 = 0.5 + 0.3 * Math.random();function frame(e){mc.scaleX = mc.scaleY +=  v0;mc.alpha > 0 ? mc.alpha -=  0.02:[mc.removeEventListener(Event.ENTER_FRAME,frame),removeChild(mc),mc = null];}}function xiayu()
{var timer:Timer = new Timer(200,2);timer.addEventListener(TimerEvent.TIMER,onTimer);var mc:MovieClip=new MovieClip();mc.graphics.beginFill(0xbbffff,0.8);mc.graphics.drawEllipse(-0.5,-2,1,4);addChild(mc);mc.scaleX = mc.scaleY = 0.7 + 0.3 * Math.random();var x0 = mc.x = 50 + Math.random() * 450;mc.y = -10 - 20 * Math.random();var y0 = 30 + 350 * Math.random();mc.addEventListener(Event.ENTER_FRAME,frameB);function frameB(e){if (mc.y < y0){mc.y +=  5;}else{mc.removeEventListener(Event.ENTER_FRAME,frameB);removeChild(mc);mc = null;init(x0,y0);timer.start();}}function onTimer(e){init(x0,y0);}}var t:Timer = new Timer(100,0);t.addEventListener(TimerEvent.TIMER,onT);t.start();function onT(e)
{xiayu();xiayu();}