下一个更精彩：AS3.0教程(3):Document Class特色

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);

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