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(0,0,10,3,4,4);

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;

}

}

}

}