ドラムンベース（っぽいもの）

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license : All rights reserved
modified : 2008-12-23 22:41:39

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package  
{

import flash.display.Sprite
    import flash.display.Shape
    import flash.events.Event;
    import flash.events.SampleDataEvent;
    import flash.filters.BlurFilter;
    import flash.media.Sound;
    
    [SWF(backgroundColor=0x000000, frameRate=60)]

public class Drumnbass_3 extends Sprite 
    {
        private const PI2:Number = Math.PI * 2;
        private const SAMPLE_RATE:Number = 44100;    
        private const LATENCY:int = 4410 //2048~8192

private var sound:Sound;
        
        private var voices:Vector.<Voice> = new Vector.<Voice>()
        private var particles:Vector.<Shape> = new Vector.<Shape>()
        private var count:int = 0
        
        public function Drumnbass_3() 
        {
            init()
        }
        
        public function init():void 
        {
            voices[0] = new Voice(60,.6,100,2000,6000)
            voices[1] = new Voice(120,.2,100,500,600)
            voices[2] = new Voice(80, .8,100,500,600)
            voices[3] = new Voice(880,.2,100,500,600)
            voices[4] = new Voice(660,.5,100,1000,1200)
            voices[5] = new Voice(440,.5,100,1000,1200)

var stageWidth:Number = stage.stageWidth
            var stageHeight:Number = stage.stageHeight
            
            
            var n:int = voices.length;
            for (var i:int = 0; i < n; i++) 
            {
                var s:Shape = new Shape()
                var x:Number = stageHeight * Math.random() * .5 - stageHeight * .25;
                var y:Number = stageHeight * Math.random() * .5 - stageHeight * .25;
                s.graphics.beginFill(0xFFFFFF * Math.random());
                s.graphics.drawCircle(x, y, Math.random() * 20 + 20);
                s.alpha = .5
                s.x = stage.stageWidth / 2;
                s.y = stage.stageHeight / 2;
                
                particles[i] = s
                addChild(s)
            }
            addEventListener(Event.ENTER_FRAME,
            function(e:Event):void {
                
                var n:int = particles.length
                for (var i:int = 0; i < n; i++) 
                {
                    var p:Shape = particles[i]
                    p.rotation += i % 2 * 2 - 1;
                    p.scaleX += (1 - p.scaleX) * .4;
                    p.scaleY += (1 - p.scaleY) * .4;
                }
            })            
            filters = [new BlurFilter(5, 5)]
            sound = new Sound()
            sound.addEventListener(SampleDataEvent.SAMPLE_DATA, updateVoice)
            sound.play()
        }
        
        private function updateVoice(e:SampleDataEvent):void
        {
            var n:Number = LATENCY
            
            count++
            var c8:int = count %8
            var c16:int = count %16
            var c32:int = count %32
            var c64:int = count % 64
            
            if (c8 == 0 ||
                c8 == 1 ||
                c8 == 2 ||
                c8 == 3 ) {
                if (Math.random() > .3) {
                    voices[2].play();
                    particles[2].scaleX = particles[2].scaleY = 2
                }else {
                    voices[3].play()
                    particles[3].scaleX = particles[3].scaleY = 2
                }
            }
            if (c8 == 6 ||
                c8 == 7 ) {
                voices[1].play()
                particles[1].scaleX = particles[1].scaleY = 2.5
            }
            if (count % 16 == 11) {
                particles[0].scaleX = particles[0].scaleY = 3
                voices[0].play()
            }
            
            if (count % 32 == 8) {
                particles[4].scaleX = particles[4].scaleY = 3
                voices[4].play()
            }
            
            if (count % 32 == 10 && Math.random()>.3){
                particles[5].scaleX = particles[5].scaleY = 4
                voices[5].play()
            }
            for (var i:int = 0; i < n; i++) 
            {
                var sample:Number = 0
                
                for each (var v:Voice in voices) 
                    sample += v.pulse;
                
                e.data.writeFloat(sample)
                e.data.writeFloat(sample)
            }
        }
 
    }
    
}

class Voice {
    
    private const PI2:Number = Math.PI * 2;
    private const SAMPLE_RATE:Number = 44100; 
    
    private var phase:Number = 0
    public var frequency:Number     
    public var volume:Number;
    public var attack:int;
    public var decay:int;
    public var sustain:int;
    private var position:int     = 0
    private var amplifier:Number = 0; 
    
    public function Voice(
    frequency:Number = 440,
    volume:Number    = .2,
    attack:int       = 1000,
    decay:int        = 1000,
    sustain:int      = 5000 )
    {
        this.frequency = frequency
        this.volume = volume
        this.attack = attack
        this.decay = decay
        this.sustain = sustain
    }
    public function get pulse():Number
    {
        return Math.sin(updatePhase()) * updateAmplifier() * volume;
    }
    public function play():void 
    {
        position = 0
    }
    public function updatePhase():Number
    {
        phase += PI2 * frequency / SAMPLE_RATE
        phase %= PI2;
        return phase
    }    
    public function updateAmplifier():Number
    {
        var position:int = (this.position++ )
        if (position >= sustain) {
            amplifier = 0
        }else if (position < attack) {
            amplifier += 1/attack
        }else if (position > (sustain-decay)) {
            amplifier -= 1/decay
        }
        return amplifier;
    }
}

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