SWF It Good

Using Flash Player 10 to produce Dynamic Musical Notes

May 20th, 2008

So after 13 year of off and on drumming I have learned a thing or two about music. Not much about tuning a guitar. Thanks to a class that I got a D in, Musical Acoustics, I know every note produces a frequency and a wavelength. With that you can now you Flash to produce a frequency and that is what I did, the six notes from left to right are the notes of a regularly tuned guitar.

Since I lost my Musical Acoustics book from UNT I had to look it up to find the Frequency of All Notes

and that pick the ones I wanted starting w/ E4.

So if you don’t have a guitar tuner…here you go.

View Code:

[as]

package
{
import flash.display.*;
import flash.events.*;
import flash.media.Sound;
import flash.text.TextField;

public class GuitarTuner extends Sprite
{
private var _key1:Sprite;
private var _key2:Sprite;
private var _key3:Sprite;
private var _key4:Sprite;
private var _key5:Sprite;
private var _key6:Sprite;

private var _sound:Sound;
private var _note:Number = 0;
private var noise:Number = 0;
private var text:TextField = new TextField();

//Constants
private static const E4:String = “E4″;
private static const A4:String = “A4″;
private static const D4:String = “D5″;
private static const G5:String = “G5″;
private static const B5:String = “B5″;
private static const E6:String = “E6″;

public function GuitarTuner()
{
stage.scaleMode = StageScaleMode.NO_SCALE;
stage.align = StageAlign.TOP_LEFT;
_key1 = makeKey();
_key1.name = GuitarTuner.E4;
_key1.addEventListener(MouseEvent.CLICK, onClick, false, 0, true);
addChild(_key1);

_key2 = makeKey();
_key2.name = GuitarTuner.A4;
_key2.addEventListener(MouseEvent.CLICK, onClick, false, 0, true);
addChild(_key2);
_key2.x = spaceFromSibling(_key1, _key2);

_key3 = makeKey();
_key3.name = GuitarTuner.D4;
_key3.addEventListener(MouseEvent.CLICK, onClick, false, 0, true);
addChild(_key3);
_key3.x = spaceFromSibling(_key2, _key3);

_key4 = makeKey();
_key4.name = GuitarTuner.G5;
_key4.addEventListener(MouseEvent.CLICK, onClick, false, 0, true);
addChild(_key4);
_key4.x = spaceFromSibling(_key3, _key4);

_key5 = makeKey();
_key5.name = GuitarTuner.B5;
_key5.addEventListener(MouseEvent.CLICK, onClick, false, 0, true);
addChild(_key5);
_key5.x = spaceFromSibling(_key4, _key5);

_key6 = makeKey();
_key6.name = GuitarTuner.E6;
_key6.addEventListener(MouseEvent.CLICK, onClick, false, 0, true);
addChild(_key6);
_key6.x = spaceFromSibling(_key5, _key6);

addChild(text);
text.x = 300;

}
private function onCallback(e:SamplesCallbackEvent):void
{
for(var i:uint=0; i<512; i++)
{
noise += _note/ 44100;

var sample:Number = noise * Math.PI * 2;
_sound.samplesCallbackData.writeFloat(Math.sin(sample));
_sound.samplesCallbackData.writeFloat(Math.sin(sample));
}
}

private function onClick(evt:MouseEvent):void
{

_sound = new Sound();
_sound.addEventListener(Event.SAMPLES_CALLBACK, onCallback);
_sound.play();
var sprite:Sprite = Sprite(evt.currentTarget);
switch(sprite.name)
{
case “midC”:

_note = 277.18;

break;

case GuitarTuner.E4:

_note = 329.63;

break;

case GuitarTuner.A4:

_note = 440.00;

break;

case GuitarTuner.D4:
_note = 587.33;
break;

case GuitarTuner.G5:
_note = 783.99;
break;

case GuitarTuner.B5:
_note = 987.77;
break;

case GuitarTuner.E6:
_note = 1318.51;
break;
}

text.text = String(_note);

}

private function makeKey():Sprite
{
var key:Sprite = new Sprite()
key.graphics.lineStyle(1, 0×000000);
key.graphics.beginFill(0xFFFFFF, 1);
key.graphics.drawRect(0, 0, 20, 50);
key.graphics.endFill();
return key;
}

public function spaceFromSibling(sibling:DisplayObject, target:DisplayObject,
coordinate:String = “x”, distance:Number = 0):Number
{
var value:int;

switch(coordinate)
{
case “x”:
value = sibling.x + sibling.width + distance;
break;

case “y”:
value = sibling.y + sibling.height + distance;

break;
}

return Math.floor(value);
}
}
}[/as]

If this code doesn’t make sense check out Lee Brimelow’s tutorial on Dynamic Sound.

Entry Filed under: actionscript, as3, flash