/**
 * @author sole / http://soledadpenades.com/
 * @author mr.doob / http://mrdoob.com/
 */

var TWEEN_MANAGER = TWEEN_MANAGER || ( function() {

	var i, time, tweens = [];

	this.add = function ( tween ) {

		tweens.push( tween );
	};

	this.remove = function ( tween ) {

		for ( var i = 0, l = tweens.length; i < l; i++ ) {

			if ( tween == tweens[ i ] ) {

				tweens.splice( i, 1 );
				return;

			}
		}

	};

	this.update = function() {

		i = 0;
		time = new Date().getTime();

		while( i < tweens.length ) {

			tweens[ i ].update( time ) ? i ++ : tweens.splice( i, 1 );

		}

	};

	return this;

} )(),

TWEEN = TWEEN || {};

TWEEN.Tween = function ( object ) {

	TWEEN_MANAGER.add( this );

	var _object = object,
	_valuesStart = {},
	_valuesChange = {},
	_duration = 1000,
	_startTime = new Date().getTime(),
	_easingFunction = TWEEN.Easing.Elastic.EaseInOut,
	// _nextTween = null,
	_onUpdateFunction = null,
	_onCompleteFunction = null;

	this.to = function( duration, properties ) {

		_duration = duration * 1000;

		for ( var property in properties ) {

			if ( _object[ property ] === null ) {

				continue;

			}

			_valuesStart[ property ] = _object[ property ];
			_valuesChange[ property ] = properties[ property ] - _object[ property ];

		}

		return this;

	};

	this.delay = function ( amount ) {

		_startTime += amount * 1000;
		return this;

	};

	this.easing = function ( easing ) {

		_easingFunction = easing;
		return this;

	};

	this.onUpdate = function ( onUpdateFunction ) {

		_onUpdateFunction = onUpdateFunction;
		return this;

	};

	this.onComplete = function ( onCompleteFunction ) {

		_onCompleteFunction = onCompleteFunction;
		return this;

	};

	this.update = function ( time ) {

		var property, elapsed;

		if ( time < _startTime ) {

			return true;

		}

		elapsed = time - _startTime;

		if ( elapsed > _duration ) {

			if ( _onCompleteFunction !== null ) {

				_onCompleteFunction();
			}

			return false;

		}

		for ( property in _valuesChange ) {

			_object[ property ] = _easingFunction( elapsed, _valuesStart[ property ], _valuesChange[ property ], _duration );

		}

		if ( _onUpdateFunction !== null ) {

			_onUpdateFunction();

		}

		return true;

	};

	this.destroy = function () {

		TWEEN_MANAGER.remove( this );

	};

}

TWEEN.Easing = { Back: {}, Elastic: {}, Expo: {}, Linear: {}, Sine: {} };

TWEEN.Easing.Back.EaseIn = function( t, b, c, d ) {

	var s = 1.70158;
	return c * ( t /= d  ) * t * ( ( s + 1 ) * t - s ) + b;

}

TWEEN.Easing.Back.EaseOut = function( t, b, c, d ) {

	var s = 1.70158;
	return c * ( ( t = t / d - 1 ) * t * ( ( s + 1 ) * t + s ) + 1 ) + b;

}

TWEEN.Easing.Back.EaseInOut = function( t, b, c, d ) {

	var s = 1.70158;
	if ( ( t /= d / 2 ) < 1 ) return c / 2 * ( t * t * ( ( ( s *= ( 1.525 ) ) + 1 ) * t - s ) ) + b;
	return c / 2 * ( ( t -= 2 ) * t * ( ( ( s *= ( 1.525 ) ) + 1 ) * t + s ) + 2 ) + b;

}

TWEEN.Easing.Elastic.EaseIn = function( t, b, c, d ) {

	if ( t == 0 ) return b;
	if ( ( t /= d ) == 1 ) return b + c;
	var p = d * .3;
	var a = c;
	var s = p / 4;
	return - ( a * Math.pow( 2, 10 * ( t -= 1 ) ) * Math.sin( ( t * d - s ) * ( 2 * Math.PI ) / p ) ) + b;

}

TWEEN.Easing.Elastic.EaseOut = function( t, b, c, d ) {

	if ( t == 0 ) return b;
	if ( ( t /= d ) == 1 ) return b + c;
	var p = d * .3;
	var a = c;
	var s = p / 4;
	return ( a * Math.pow( 2, - 10 * t ) * Math.sin( ( t * d - s ) * ( 2 * Math.PI ) / p ) + c + b );

}

TWEEN.Easing.Elastic.EaseInOut = function(t, b, c, d) {

	if ( t == 0 ) return b;
	if ( ( t /= d / 2 ) == 2 ) return b + c;
	var p = d * ( .3 * 1.5 );
	var a = c;
	var s = p / 4;
	if ( t < 1 ) return - .5 * ( a * Math.pow( 2, 10 * ( t -= 1 ) ) * Math.sin( ( t * d - s ) * ( 2 * Math.PI ) / p ) ) + b;
	return a * Math.pow( 2, - 10 * ( t -= 1 ) ) * Math.sin( ( t * d - s ) * ( 2 * Math.PI ) / p ) * .5 + c + b;

}

TWEEN.Easing.Expo.EaseIn = function(t, b, c, d) {

	return ( t == 0) ? b : c * Math.pow( 2, 10 * ( t / d - 1 ) ) + b;

}

TWEEN.Easing.Expo.EaseOut = function(t, b, c, d) {

	return ( t == d ) ? b + c : c * ( - Math.pow( 2, - 10 * t / d) + 1) + b;

}

TWEEN.Easing.Expo.EaseInOut = function(t, b, c, d) {

	if ( t == 0 ) return b;
	if ( t == d ) return b+c;
	if ( ( t /= d / 2 ) < 1) return c / 2 * Math.pow( 2, 10 * ( t - 1 ) ) + b;
	return c / 2 * ( - Math.pow( 2, - 10 * --t ) + 2) + b;

}

TWEEN.Easing.Linear.EaseNone = function (t, b, c, d) {

		return c * t / d + b;

}

TWEEN.Easing.Linear.EaseIn = function (t, b, c, d) {

		return c * t / d + b;

}

TWEEN.Easing.Linear.EaseOut = function (t, b, c, d) {

		return c * t / d + b;

}

TWEEN.Easing.Linear.EaseInOut = function (t, b, c, d) {

		return c * t / d + b;

}

TWEEN.Easing.Sine.EaseIn = function( t, b, c,d ) {

	return -c * Math.cos( t / d * ( Math.PI / 2 ) ) + c + b;

}

TWEEN.Easing.Sine.EaseInOutSine = function( t, b, c, d ) {

	return -c / 2 * ( Math.cos( Math.PI * t / d ) - 1 ) + b;

}

TWEEN.Easing.Sine.EaseOut = function( t, b, c, d ) {

	 return c * Math.sin( t / d * ( Math.PI / 2 ) ) + b;

}