flash加载动画效果AS3.0代码实现

package { import flash.display.Shape; import flash.display.Sprite; import flash.events.Event; import flash.geom.Matrix; import flash.utils.Timer; import flash.events.TimerEvent; public class loading extends Sprite { private var nums:int = 12; private var m2:Matrix = new Matrix(); private var m:Matrix = new Matrix(); private var Abar:Array = new Array(); private var segAngle:Number; private var seg:Number; private var j:Number = 0; private var timer:Timer = new Timer(50); public function loading():void { initBar(); } private function initBar():void { segAngle = 2 * Math.PI / this.nums; seg = 1 / this.nums; for (var i:int = 0; i < this.nums ; i++) { var bar:Shape=new Shape(); Abar[i] = bar; bar.graphics.beginFill(0xffffff); bar.graphics.drawRoundRect(0,10,3,4,4); bar.graphics.endFill(); this.addChild(bar); bar.x = bar.y = 100; m.identity(); m.translate(7,-1); m.rotate(segAngle*i); m.translate(-7,1); m2.identity(); m2.translate(100,100); m.concat(m2); bar.transform.matrix = m; } timer.addEventListener(TimerEvent.TIMER,alphaHalder); timer.start(); } private function alphaHalder(evt:TimerEvent):void { for (var i:int = 0; i < this.nums; i++) { var bar:Shape = Abar[i] as Shape; bar.alpha = j; if (j == 1.0833333333333333) { j = 0; } j += seg; } } } }