【AS3代码】音乐波纹

package
{
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.media.Sound;
    import flash.media.SoundChannel;
    import flash.media.SoundMixer;
    import flash.net.URLRequest;
    import flash.utils.ByteArray;        //字节数组类
    
    public class Main extends Sprite
    {
        private var url:String = "music.mp3";
        private var sound:Sound = new Sound();                //创建声音
        private var schannel:SoundChannel;                    //创建声音通道
        private var barray:ByteArray = new ByteArray();        //创建字节数组
        private var ary:Array;
        private var n:Number = 0;                            //记录数量
        
        public function Main():void
        {
            init();
        }
        
        private function init():void
        {
            //将mp3文件载入到声音并播放
            var req:URLRequest = new URLRequest(url);
            sound.load(req);                            
            sound.play();
            
            //从载入第一帧开始，就不断循环触发的事件
            this.addEventListener(Event.ENTER_FRAME, show);
        }
        
        //开始绘图
        private function show(evt:Event):void
        {
            n = 0;                        //先清零
            this.graphics.clear();        //清除所有图形
            
            //把音频数据转化为字节数组，并保存在barray里，之后将会用这些数据生成动态变化的小竖线
            SoundMixer.computeSpectrum(barray,true,0);    
            
            //绘制动态的小竖线动画，让每条线都隔一点距离，所以用i+=16
            for(var i:uint = 0; i < 100; i += 5)
            {
                n = barray.readFloat();
                var num:Number = n * 100;
                this.graphics.lineStyle(3, 0x00ff00);
                this.graphics.moveTo(i, 100);            //绘制线条起始点
                this.graphics.lineTo(i, 100 - num);    //绘制线条终点
                this.graphics.endFill();
            }
        }
    }
}