平滑进度条

　　在舞台上绘制progressBar元件，注册点设置为左边。代码如下：

package 
{
    import flash.display.MovieClip;
    import flash.events.Event;
    
    public class ProgressBar extends MovieClip
    {
        private var totalTime:Number;
        private var startTime:Number;
        private var stopTime:Number;
        
        public function ProgressBar()
        {
            initGame();
        }
        
        /**
         * 初始化游戏
         */
        private function initGame():void
        {
            //设置初始数据
            setData();        
        }
        
        /**
         * 设置游戏数据
         */
        private function setData():void
        {
            startTime = 0;
            totalTime = 30;
            progressBar.scaleX = 1;
            // 设定计时器
            setGameTimer();
        }
        
        /**
         * 设置计时器
         */
        private function setGameTimer():void
        {
            var startDate:Date = new Date();
            startTime = startDate.getTime();
            totalTime = totalTime * 1000;
            this.addEventListener(Event.ENTER_FRAME, onEnterFrame);
        }
        
        /**
         * 刷新游戏进度条
         */
        private function onEnterFrame(e:Event):void
        {
            var nowTime:Date = new Date();
            var passTime:Number = nowTime.getTime() - startTime;
            progressBar.scaleX = 1 - passTime / totalTime;
            if (passTime > totalTime)
            {
                endGame();
            }
        }
        
        /**
         * 游戏结束
         */
        private function endGame():void
        {
            this.removeEventListener(Event.ENTER_FRAME, onEnterFrame);
            trace("gameOver")
        }
    }

}