function StopWatch() {
	this.startTime = 0;
	this.ellapsedTime = 0;
	this.isPaused = true;

	this.timerEvent = null;

	var fontStyle = StopWatch.DEFAULT_TEXT_FONT;
	this.timerText = game.add.text(game.world.centerX, 35, "", fontStyle);
	this.timerText.anchor.set(0.5);
	this.printTime();
}

StopWatch.prototype.start = function() {
	this.isPaused = false;
	this.startTime = game.time.totalElapsedSeconds();

	this.ellapsedTimer = game.time.create(false);
	this.timerEvent = this.ellapsedTimer.loop(10, this.updateTimer, this);
	this.ellapsedTimer.start();

	this.printTime();
}

StopWatch.prototype.pause = function() {
	this.isPaused = true;
}

StopWatch.prototype.resume = function() {
	this.isPaused = false;
}

StopWatch.prototype.stop = function() {
	var recordTime = game.time.totalElapsedSeconds() - this.startTime;
	this.removeTimer();

	return recordTime;
}

StopWatch.prototype.updateTimer = function() {
	if(this.isPaused == true)
		return;

	this.ellapsedTime = game.time.totalElapsedSeconds() - this.startTime;
	this.printTime();
}

StopWatch.prototype.printTime = function() {
	this.timerText.text = RecordUtil.getRecordValueWithUnit(
		this.ellapsedTime, sessionStorageManager.getPlayingAppID()
	);
}

StopWatch.prototype.removeTimer = function() {
	game.time.events.remove(this.timerEvent);
	if(this.timerEvent)
		this.timerEvent = null;

	this.ellapsedTimer.stop();
	this.ellapsedTimer = null;
}



StopWatch.FONT_HEIGHT_PX		= 70;

StopWatch.DEFAULT_TEXT_FONT	= {
	font: "38px Arial",
	align: "center",
	boundsAlignH: "center",		// left, center. right
	boundsAlignV: "middle", 	// top, middle, bottom
	fill: "#fff"
};