Actionscript 3.0提供的新功能，其中用到了ByteArray、SoundMixer。
代码如下：
- function func(a:Number) {
- return num * Math.sin(a);
- }
- function drawFunction(func:Function, thickness:Number, color:Number) {
- graphics.lineStyle(thickness, color, 100);
- graphics.moveTo(30, stage.stageHeight / 2 - func((30 + t) / 20) * 20);
- for (var i = 30; i <= stage.stageWidth - 30; i++) {
- var fi = stage.stageHeight / 2 - func((i + t++) / 20) * 20;
- graphics.lineTo(i, fi);
- }
- }
- function spectrum(event:Event) {
- graphics.clear();
- SoundMixer.computeSpectrum(ba, true, 0);
- num = ba.readFloat() * 10;
- drawFunction(func, 1, 0x0066cc);
- }
- var sound:Sound = new Sound();
- var sound_channel:SoundChannel;
- var ba:ByteArray = new ByteArray();
- var num:Number;
- var t:Number = 0;
- sound.load(new URLRequest("test.mp3"));
- sound_channel = sound.play();
- this.addEventListener(Event.ENTER_FRAME, spectrum);
