Titanium Zero Latency Sound with Multi Touch

app.js

/**
 * Example application for combining TiMultiTouch module with Zero Latency Sound module.
 *
 * # https://marketplace.appcelerator.com/apps/860  TiMultiTouch
 * # https://marketplace.appcelerator.com/apps/891  Zero Latency Sound
 * 
 * Created for Jose R. Castello
 */

Titanium.UI.setBackgroundColor('#000');
Titanium.UI.iPhone.hideStatusBar();

require('org.urish.titanium.multitouch');
var ZLSound = require('com.salsarhythmsoftware.zlsound');

function createNoteController(name, fileName, pitch, loop, rect) {
	var soundFile = Ti.Filesystem.getFile(fileName).nativePath;
	var sample = ZLSound.createSample({
		media : soundFile,
		loopIn : loop[0],
		loopOut : loop[1],
		pitch : pitch
	});

	function play() {
		Ti.API.info("Playing: " + this.name);
		sample.loop(1000);
	}

	function stop() {
		Ti.API.info("Stopping: " + this.name);
		sample.stop();
	}

	return {
		name : name,
		rect : rect,
		play : play,
		stop : stop,
	};
}

var noteDatabaseFile = Ti.Filesystem.getFile("notes.json");
var noteDatabase = JSON.parse(noteDatabaseFile.read().toString());
var win = Ti.UI.createWindow({
	orientationModes : [Ti.UI.LANDSCAPE_RIGHT, Ti.UI.LANDSCAPE_LEFT]
});
var isiPad = (Ti.Platform.osname == "ipad");

var backgroundImage = Ti.UI.createImageView({
	image : isiPad ? "background@2x.png" : "background.png",
	height : isiPad ? 480 : 320,
	width : isiPad ? 720 : 480,
	top : isiPad ? 144 : 0,
	left : isiPad ? 142 : 0
});
win.add(backgroundImage);

var noteButtons = [];

noteDatabase.notes.map(function(note) {
	if(isiPad) {
		note.rect = note.rect.map(function(x) {
			return x * 1.5;
		});
	}

	var noteController = createNoteController(note.name, note.file, note.pitch, note.loop, note.rect)
	if(note.name.indexOf("#") >= 0) {
		// Since sharps appear on top of other notes, they have to be first
		noteButtons.unshift(noteController);
	} else {
		noteButtons.push(noteController);
	}
});
function findNoteIndex(x, y) {
	for(var i = 0; i < noteButtons.length; i++) {
		var r = noteButtons[i].rect;
		if((r[0] <= x) && (r[1] <= y) && (r[0] + r[2] >= x) && (r[1] + r[3] >= y)) {
			return i;
		}
	}
	return null;
}

var activeNotes = {};
var lastTouch = null;

function getTouches(e) {
	return e.points;
}

function windowTouchStart(e) {
	var touches = getTouches(e);
	for(var key in touches) {
		var selectedNote = findNoteIndex(touches[key].x, touches[key].y);
		if(selectedNote !== activeNotes[key]) {
			if(activeNotes[key] !== undefined && activeNotes[key] !== null) {
				noteButtons[activeNotes[key]].stop();
			}
			if(selectedNote !== null) {
				noteButtons[selectedNote].play();
			}
			activeNotes[key] = selectedNote;
		}
	}
}

function windowTouchEnd(e) {
	var touches = getTouches(e);
	for(var key in touches) {
		if(activeNotes[key] !== undefined && activeNotes[key] !== null) {
			noteButtons[activeNotes[key]].stop();
		}
		delete activeNotes[key];
		lastTouch = null;
	}
}

win.addEventListener('singletap', function(ev) {
	// DON'T REMOVE THIS LISTENER!!
	// hack for multi touch module
});
win.addEventListener("touchstart", windowTouchStart);
win.addEventListener("touchmove", windowTouchStart);
win.addEventListener("touchcancel", windowTouchEnd);
win.addEventListener("touchend", windowTouchEnd);

if(isiPad) {
	var footer = Ti.UI.createLabel({
		text : "Copyright (c) 2011, Uri Shaked",
		color : 'white',
		bottom : 10,
		left : 10,
		height : 'auto',
		font : {
			fontFamily : 'Helvetica Neue',
			fontSize : 16
		}
	});
	win.add(footer);
}

win.open({
	transition : Titanium.UI.iPhone.AnimationStyle.FLIP_FROM_LEFT
});