Sound Test

1〜7のキーボードで鍵盤

by kjkmr 17 Jan 2009

• Related works: 1

Tags

Dynamic sound synthesizer
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// write as3 code here..
// 1〜7のキーボードで鍵盤

package {
    
    import flash.display.Sprite;
    import flash.filters.BlurFilter;
    import flash.media.Sound;
    import flash.media.SoundChannel;
    import flash.events.Event;
    import flash.events.KeyboardEvent;
    import flash.events.SampleDataEvent;
    import flash.events.TimerEvent;
    import flash.text.TextField;
    import flash.utils.Timer;
    
    
    public class Main extends Sprite {
           
        public const snd:Sound = new Sound();
        public const wrapper:Sprite = new Sprite(); 
        public const g:Sprite = new Sprite(); 
        public const t:TextField = new TextField();
        public const keys:Array = [0,2,4,5,7,9,11];
        public const tones:Array = ["ド","レ","ミ","ファ","ソ","ラ","シ"];
        public var ch:SoundChannel;
        public var tone:Number = 1;
    
        public function Main() {
            //配置
            addChild(wrapper);
            wrapper.addChild(g);
            wrapper.filters = [new BlurFilter(8,8,1)];
            addChild(t);
            //Text
            t.selectable = false;
            t.width = 300;
            t.height = 300;
            t.htmlText = "<P ALIGN='CENTER'><FONT SIZE='128'>!</FONT></P>";
            t.x = (stage.stageWidth-t.width)/2;
            t.y = (stage.stageHeight-t.textHeight)/2;
            //描画
            g.graphics.beginFill(0x660066);
            g.graphics.drawRect(0,0,10,10);
            g.graphics.endFill();
            //音
            snd.addEventListener(SampleDataEvent.SAMPLE_DATA, onSampleData);
            //キーボード
            stage.addEventListener(KeyboardEvent.KEY_DOWN,onKeyDown);
            stage.addEventListener(KeyboardEvent.KEY_UP,onKeyUp);
        }
        
        private function onKeyDown(e:KeyboardEvent):void {
            var n:Number = e.keyCode - 48;
            if ( n < 1 || n > keys.length ) return;
            tone = (1+keys[n-1]/12)/2;
            if ( ch ) ch.stop();
            ch = snd.play();
            t.htmlText = "<P ALIGN='CENTER'><FONT SIZE='128'>"+tones[n-1]+"</FONT></P>";
        }
        private function onKeyUp(e:KeyboardEvent):void {
            var n:Number = e.keyCode - 48;
            if ( n < 1 || n > keys.length ) return;
            ch.stop();
            t.htmlText = "<P ALIGN='CENTER'><FONT SIZE='128'>!</FONT></P>";
        }

        private function onSampleData(event:SampleDataEvent):void  {
            for (var c:int=0; c<8192; c++) {
                var rad:Number = (Number(c+event.position)*tone/Math.PI);
                var amp:Number = Math.sin(rad) / 4;  // -1 から 1 の間の値なら OK
                event.data.writeFloat(amp);  // 左チャネルの音
                event.data.writeFloat(amp);  // 右チャネルの音
            }
        }
    }
}