in the beginning

lib/Tween.js

@@ -0,0 +1,530 @@
+/**
+ * @author sole / http://soledadpenades.com
+ * @author mr.doob / http://mrdoob.com
+ * @author Robert Eisele / http://www.xarg.org
+ * @author Philippe / http://philippe.elsass.me
+ * @author Robert Penner / http://www.robertpenner.com/easing_terms_of_use.html
+ * @author Paul Lewis / http://www.aerotwist.com/
+ * @author lechecacharro
+ * @author Josh Faul / http://jocafa.com/
+ */
+
+var TWEEN = TWEEN || ( function () {
+
+	var i, tl, interval, time, fps = 60, autostart = false, tweens = [];
+
+	return {
+	
+		setFPS: function ( f ) {
+
+			fps = f || 60;
+
+		},
+
+		start: function ( f ) {
+			
+			if( arguments.length != 0 ) {
+				this.setFPS( f );
+			}
+			
+			interval = setInterval( this.update, 1000 / fps );
+
+		},
+
+		stop: function () {
+
+			clearInterval( interval );
+
+		},
+
+		setAutostart: function ( value ) {
+
+			autostart = value;
+			
+			if(autostart && !interval) {
+				this.start();
+			}
+
+		},
+
+		add: function ( tween ) {
+
+			tweens.push( tween );
+
+			if (autostart && !interval) {
+
+				this.start();
+
+			}
+
+		},
+
+		getAll: function() {
+
+			return tweens;
+
+		},
+
+		removeAll: function() {
+
+			tweens = [];
+
+		},
+
+		remove: function ( tween ) {
+
+			i = tweens.indexOf( tween );
+
+			if ( i !== -1 ) {
+
+				tweens.splice( i, 1 );
+
+			}
+
+		},
+
+		update: function (_time) {
+
+			i = 0; num_tweens = tweens.length;
+			var time = _time || Date.now();
+
+			while ( i < num_tweens ) {
+
+				if ( tweens[ i ].update( time ) ) {
+
+					i++;
+
+				} else {
+
+					tweens.splice( i, 1 );
+					num_tweens--;
+
+				}
+
+			}
+
+			if (num_tweens == 0 && autostart == true) {
+
+				this.stop();
+
+			}
+
+		}
+
+	};
+
+} )();
+
+TWEEN.Tween = function ( object ) {
+
+	var _object = object,
+	_valuesStart = {},
+	_valuesDelta = {},
+	_valuesEnd = {},
+	_duration = 1000,
+	_delayTime = 0,
+	_startTime = null,
+	_easingFunction = TWEEN.Easing.Linear.EaseNone,
+	_chainedTween = null,
+	_onUpdateCallback = null,
+	_onCompleteCallback = null;
+
+	this.to = function ( properties, duration ) {
+
+		if( duration !== null ) {
+
+			_duration = duration;
+
+		}
+
+		for ( var property in properties ) {
+
+			// This prevents the engine from interpolating null values
+			if ( _object[ property ] === null ) {
+
+				continue;
+
+			}
+
+			// The current values are read when the tween starts;
+			// here we only store the final desired values
+			_valuesEnd[ property ] = properties[ property ];
+
+		}
+
+		return this;
+
+	};
+
+	this.start = function (_time) {
+
+		TWEEN.add( this );
+
+		_startTime = _time ? _time + _delayTime : Date.now() + _delayTime;
+
+		for ( var property in _valuesEnd ) {
+
+			// Again, prevent dealing with null values
+			if ( _object[ property ] === null ) {
+
+				continue;
+
+			}
+
+			_valuesStart[ property ] = _object[ property ];
+			_valuesDelta[ property ] = _valuesEnd[ property ] - _object[ property ];
+
+		}
+
+		return this;
+	};
+
+	this.stop = function () {
+
+		TWEEN.remove( this );
+		return this;
+
+	};
+
+	this.delay = function ( amount ) {
+
+		_delayTime = amount;
+		return this;
+
+	};
+
+	this.easing = function ( easing ) {
+
+		_easingFunction = easing;
+		return this;
+
+	};
+
+	this.chain = function ( chainedTween ) {
+
+		_chainedTween = chainedTween;
+
+	};
+
+	this.onUpdate = function ( onUpdateCallback ) {
+
+		_onUpdateCallback = onUpdateCallback;
+		return this;
+
+	};
+
+	this.onComplete = function ( onCompleteCallback ) {
+
+		_onCompleteCallback = onCompleteCallback;
+		return this;
+
+	};
+
+	this.update = function ( time ) {
+
+		var property, elapsed, value;
+
+		if ( time < _startTime ) {
+
+			return true;
+
+		}
+
+		elapsed = ( time - _startTime ) / _duration;
+		elapsed = elapsed > 1 ? 1 : elapsed;
+
+		value = _easingFunction( elapsed );
+
+		for ( property in _valuesDelta ) {
+
+			_object[ property ] = _valuesStart[ property ] + _valuesDelta[ property ] * value;
+
+		}
+
+		if ( _onUpdateCallback !== null ) {
+
+			_onUpdateCallback.call( _object, value );
+
+		}
+
+		if ( elapsed == 1 ) {
+
+			if ( _onCompleteCallback !== null ) {
+
+				_onCompleteCallback.call( _object );
+
+			}
+
+			if ( _chainedTween !== null ) {
+
+				_chainedTween.start();
+
+			}
+
+			return false;
+
+		}
+
+		return true;
+
+	};
+
+	/*
+	this.destroy = function () {
+
+		TWEEN.remove( this );
+
+	};
+	*/
+}
+
+TWEEN.Easing = { Linear: {}, Quadratic: {}, Cubic: {}, Quartic: {}, Quintic: {}, Sinusoidal: {}, Exponential: {}, Circular: {}, Elastic: {}, Back: {}, Bounce: {} };
+
+
+TWEEN.Easing.Linear.EaseNone = function ( k ) {
+
+	return k;
+
+};
+
+//
+
+TWEEN.Easing.Quadratic.EaseIn = function ( k ) {
+
+	return k * k;
+
+};
+
+TWEEN.Easing.Quadratic.EaseOut = function ( k ) {
+
+	return - k * ( k - 2 );
+
+};
+
+TWEEN.Easing.Quadratic.EaseInOut = function ( k ) {
+
+	if ( ( k *= 2 ) < 1 ) return 0.5 * k * k;
+	return - 0.5 * ( --k * ( k - 2 ) - 1 );
+
+};
+
+//
+
+TWEEN.Easing.Cubic.EaseIn = function ( k ) {
+
+	return k * k * k;
+
+};
+
+TWEEN.Easing.Cubic.EaseOut = function ( k ) {
+
+	return --k * k * k + 1;
+
+};
+
+TWEEN.Easing.Cubic.EaseInOut = function ( k ) {
+
+	if ( ( k *= 2 ) < 1 ) return 0.5 * k * k * k;
+	return 0.5 * ( ( k -= 2 ) * k * k + 2 );
+
+};
+
+//
+
+TWEEN.Easing.Quartic.EaseIn = function ( k ) {
+
+	return k * k * k * k;
+
+};
+
+TWEEN.Easing.Quartic.EaseOut = function ( k ) {
+
+	 return - ( --k * k * k * k - 1 );
+
+}
+
+TWEEN.Easing.Quartic.EaseInOut = function ( k ) {
+
+	if ( ( k *= 2 ) < 1) return 0.5 * k * k * k * k;
+	return - 0.5 * ( ( k -= 2 ) * k * k * k - 2 );
+
+};
+
+//
+
+TWEEN.Easing.Quintic.EaseIn = function ( k ) {
+
+	return k * k * k * k * k;
+
+};
+
+TWEEN.Easing.Quintic.EaseOut = function ( k ) {
+
+	return ( k = k - 1 ) * k * k * k * k + 1;
+
+};
+
+TWEEN.Easing.Quintic.EaseInOut = function ( k ) {
+
+	if ( ( k *= 2 ) < 1 ) return 0.5 * k * k * k * k * k;
+	return 0.5 * ( ( k -= 2 ) * k * k * k * k + 2 );
+
+};
+
+// 
+
+TWEEN.Easing.Sinusoidal.EaseIn = function ( k ) {
+
+	return - Math.cos( k * Math.PI / 2 ) + 1;
+
+};
+
+TWEEN.Easing.Sinusoidal.EaseOut = function ( k ) {
+
+	return Math.sin( k * Math.PI / 2 );
+
+};
+
+TWEEN.Easing.Sinusoidal.EaseInOut = function ( k ) {
+
+	return - 0.5 * ( Math.cos( Math.PI * k ) - 1 );
+
+};
+
+//
+
+TWEEN.Easing.Exponential.EaseIn = function ( k ) {
+
+	return k == 0 ? 0 : Math.pow( 2, 10 * ( k - 1 ) );
+
+};
+
+TWEEN.Easing.Exponential.EaseOut = function ( k ) {
+
+	return k == 1 ? 1 : - Math.pow( 2, - 10 * k ) + 1;
+
+};
+
+TWEEN.Easing.Exponential.EaseInOut = function ( k ) {
+
+	if ( k == 0 ) return 0;
+        if ( k == 1 ) return 1;
+        if ( ( k *= 2 ) < 1 ) return 0.5 * Math.pow( 2, 10 * ( k - 1 ) );
+        return 0.5 * ( - Math.pow( 2, - 10 * ( k - 1 ) ) + 2 );
+
+};
+
+// 
+
+TWEEN.Easing.Circular.EaseIn = function ( k ) {
+
+	return - ( Math.sqrt( 1 - k * k ) - 1);
+
+};
+
+TWEEN.Easing.Circular.EaseOut = function ( k ) {
+
+	return Math.sqrt( 1 - --k * k );
+
+};
+
+TWEEN.Easing.Circular.EaseInOut = function ( k ) {
+
+	if ( ( k /= 0.5 ) < 1) return - 0.5 * ( Math.sqrt( 1 - k * k) - 1);
+	return 0.5 * ( Math.sqrt( 1 - ( k -= 2) * k) + 1);
+
+};
+
+//
+
+TWEEN.Easing.Elastic.EaseIn = function( k ) {
+
+	var s, a = 0.1, p = 0.4;
+	if ( k == 0 ) return 0; if ( k == 1 ) return 1; if ( !p ) p = 0.3;
+	if ( !a || a < 1 ) { a = 1; s = p / 4; }
+	else s = p / ( 2 * Math.PI ) * Math.asin( 1 / a );
+	return - ( a * Math.pow( 2, 10 * ( k -= 1 ) ) * Math.sin( ( k - s ) * ( 2 * Math.PI ) / p ) );
+
+};
+
+TWEEN.Easing.Elastic.EaseOut = function( k ) {
+
+	var s, a = 0.1, p = 0.4;
+	if ( k == 0 ) return 0; if ( k == 1 ) return 1; if ( !p ) p = 0.3;
+	if ( !a || a < 1 ) { a = 1; s = p / 4; }
+	else s = p / ( 2 * Math.PI ) * Math.asin( 1 / a );
+	return ( a * Math.pow( 2, - 10 * k) * Math.sin( ( k - s ) * ( 2 * Math.PI ) / p ) + 1 );
+
+};
+
+TWEEN.Easing.Elastic.EaseInOut = function( k ) {
+
+	var s, a = 0.1, p = 0.4;
+	if ( k == 0 ) return 0; if ( k == 1 ) return 1; if ( !p ) p = 0.3;
+        if ( !a || a < 1 ) { a = 1; s = p / 4; }
+        else s = p / ( 2 * Math.PI ) * Math.asin( 1 / a );
+        if ( ( k *= 2 ) < 1 ) return - 0.5 * ( a * Math.pow( 2, 10 * ( k -= 1 ) ) * Math.sin( ( k - s ) * ( 2 * Math.PI ) / p ) );
+        return a * Math.pow( 2, -10 * ( k -= 1 ) ) * Math.sin( ( k - s ) * ( 2 * Math.PI ) / p ) * 0.5 + 1;
+
+};
+
+//
+
+TWEEN.Easing.Back.EaseIn = function( k ) {
+
+	var s = 1.70158;
+	return k * k * ( ( s + 1 ) * k - s );
+
+};
+
+TWEEN.Easing.Back.EaseOut = function( k ) {
+
+	var s = 1.70158;
+	return ( k = k - 1 ) * k * ( ( s + 1 ) * k + s ) + 1;
+
+};
+
+TWEEN.Easing.Back.EaseInOut = function( k ) {
+
+	var s = 1.70158 * 1.525;
+	if ( ( k *= 2 ) < 1 ) return 0.5 * ( k * k * ( ( s + 1 ) * k - s ) );
+	return 0.5 * ( ( k -= 2 ) * k * ( ( s + 1 ) * k + s ) + 2 );
+
+};
+
+// 
+
+TWEEN.Easing.Bounce.EaseIn = function( k ) {
+
+	return 1 - TWEEN.Easing.Bounce.EaseOut( 1 - k );
+
+};
+
+TWEEN.Easing.Bounce.EaseOut = function( k ) {
+
+	if ( ( k /= 1 ) < ( 1 / 2.75 ) ) {
+
+		return 7.5625 * k * k;
+
+	} else if ( k < ( 2 / 2.75 ) ) {
+
+		return 7.5625 * ( k -= ( 1.5 / 2.75 ) ) * k + 0.75;
+
+	} else if ( k < ( 2.5 / 2.75 ) ) {
+
+		return 7.5625 * ( k -= ( 2.25 / 2.75 ) ) * k + 0.9375;
+
+	} else {
+
+		return 7.5625 * ( k -= ( 2.625 / 2.75 ) ) * k + 0.984375;
+
+	}
+
+};
+
+TWEEN.Easing.Bounce.EaseInOut = function( k ) {
+
+	if ( k < 0.5 ) return TWEEN.Easing.Bounce.EaseIn( k * 2 ) * 0.5;
+	return TWEEN.Easing.Bounce.EaseOut( k * 2 - 1 ) * 0.5 + 0.5;
+
+};