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phaser/todo/Tween.js
Richard Davey d323404676 Starting integration of tween.js
2013-08-28 21:29:25 +01:00

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/**
* @author sole / http://soledadpenades.com
* @author mrdoob / 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/
* @author egraether / http://egraether.com/
* @author endel / http://endel.me
* @author Ben Delarre / http://delarre.net
*/
// Date.now shim for (ahem) Internet Explo(d|r)er
if ( Date.now === undefined ) {
Date.now = function () {
return new Date().valueOf();
};
}
var TWEEN = TWEEN || ( function () {
var _tweens = [];
return {
REVISION: '11dev',
getAll: function () {
return _tweens;
},
removeAll: function () {
_tweens = [];
},
add: function ( tween ) {
_tweens.push( tween );
},
remove: function ( tween ) {
var i = _tweens.indexOf( tween );
if ( i !== -1 ) {
_tweens.splice( i, 1 );
}
},
update: function ( time ) {
if ( _tweens.length === 0 ) return false;
var i = 0, numTweens = _tweens.length;
time = time !== undefined ? time : ( typeof window !== 'undefined' && window.performance !== undefined && window.performance.now !== undefined ? window.performance.now() : Date.now() );
while ( i < numTweens ) {
if ( _tweens[ i ].update( time ) ) {
i ++;
} else {
_tweens.splice( i, 1 );
numTweens --;
}
}
return true;
}
};
} )();
TWEEN.Tween = function ( object ) {
var _object = object;
var _valuesStart = {};
var _valuesEnd = {};
var _valuesStartRepeat = {};
var _duration = 1000;
var _repeat = 0;
var _yoyo = false;
var _reversed = false;
var _delayTime = 0;
var _startTime = null;
var _easingFunction = TWEEN.Easing.Linear.None;
var _interpolationFunction = TWEEN.Interpolation.Linear;
var _chainedTweens = [];
var _onStartCallback = null;
var _onStartCallbackFired = false;
var _onUpdateCallback = null;
var _onCompleteCallback = null;
// Set all starting values present on the target object
for ( var field in object ) {
_valuesStart[ field ] = parseFloat(object[field], 10);
}
this.to = function ( properties, duration ) {
if ( duration !== undefined ) {
_duration = duration;
}
_valuesEnd = properties;
return this;
};
this.start = function ( time ) {
TWEEN.add( this );
_onStartCallbackFired = false;
_startTime = time !== undefined ? time : ( typeof window !== 'undefined' && window.performance !== undefined && window.performance.now !== undefined ? window.performance.now() : Date.now() );
_startTime += _delayTime;
for ( var property in _valuesEnd ) {
// check if an Array was provided as property value
if ( _valuesEnd[ property ] instanceof Array ) {
if ( _valuesEnd[ property ].length === 0 ) {
continue;
}
// create a local copy of the Array with the start value at the front
_valuesEnd[ property ] = [ _object[ property ] ].concat( _valuesEnd[ property ] );
}
_valuesStart[ property ] = _object[ property ];
if( ( _valuesStart[ property ] instanceof Array ) === false ) {
_valuesStart[ property ] *= 1.0; // Ensures we're using numbers, not strings
}
_valuesStartRepeat[ property ] = _valuesStart[ property ] || 0;
}
return this;
};
this.stop = function () {
TWEEN.remove( this );
return this;
};
this.delay = function ( amount ) {
_delayTime = amount;
return this;
};
this.repeat = function ( times ) {
_repeat = times;
return this;
};
this.yoyo = function( yoyo ) {
_yoyo = yoyo;
return this;
};
this.easing = function ( easing ) {
_easingFunction = easing;
return this;
};
this.interpolation = function ( interpolation ) {
_interpolationFunction = interpolation;
return this;
};
this.chain = function () {
_chainedTweens = arguments;
return this;
};
this.onStart = function ( callback ) {
_onStartCallback = callback;
return this;
};
this.onUpdate = function ( callback ) {
_onUpdateCallback = callback;
return this;
};
this.onComplete = function ( callback ) {
_onCompleteCallback = callback;
return this;
};
this.update = function ( time ) {
var property;
if ( time < _startTime ) {
return true;
}
if ( _onStartCallbackFired === false ) {
if ( _onStartCallback !== null ) {
_onStartCallback.call( _object );
}
_onStartCallbackFired = true;
}
var elapsed = ( time - _startTime ) / _duration;
elapsed = elapsed > 1 ? 1 : elapsed;
var value = _easingFunction( elapsed );
for ( property in _valuesEnd ) {
var start = _valuesStart[ property ] || 0;
var end = _valuesEnd[ property ];
if ( end instanceof Array ) {
_object[ property ] = _interpolationFunction( end, value );
} else {
// Parses relative end values with start as base (e.g.: +10, -3)
if ( typeof(end) === "string" ) {
end = start + parseFloat(end, 10);
}
// protect against non numeric properties.
if ( typeof(end) === "number" ) {
_object[ property ] = start + ( end - start ) * value;
}
}
}
if ( _onUpdateCallback !== null ) {
_onUpdateCallback.call( _object, value );
}
if ( elapsed == 1 ) {
if ( _repeat > 0 ) {
if( isFinite( _repeat ) ) {
_repeat--;
}
// reassign starting values, restart by making startTime = now
for( property in _valuesStartRepeat ) {
if ( typeof( _valuesEnd[ property ] ) === "string" ) {
_valuesStartRepeat[ property ] = _valuesStartRepeat[ property ] + parseFloat(_valuesEnd[ property ], 10);
}
if (_yoyo) {
var tmp = _valuesStartRepeat[ property ];
_valuesStartRepeat[ property ] = _valuesEnd[ property ];
_valuesEnd[ property ] = tmp;
_reversed = !_reversed;
}
_valuesStart[ property ] = _valuesStartRepeat[ property ];
}
_startTime = time + _delayTime;
return true;
} else {
if ( _onCompleteCallback !== null ) {
_onCompleteCallback.call( _object );
}
for ( var i = 0, numChainedTweens = _chainedTweens.length; i < numChainedTweens; i ++ ) {
_chainedTweens[ i ].start( time );
}
return false;
}
}
return true;
};
};
TWEEN.Easing = {
Linear: {
None: function ( k ) {
return k;
}
},
Quadratic: {
In: function ( k ) {
return k * k;
},
Out: function ( k ) {
return k * ( 2 - k );
},
InOut: function ( k ) {
if ( ( k *= 2 ) < 1 ) return 0.5 * k * k;
return - 0.5 * ( --k * ( k - 2 ) - 1 );
}
},
Cubic: {
In: function ( k ) {
return k * k * k;
},
Out: function ( k ) {
return --k * k * k + 1;
},
InOut: function ( k ) {
if ( ( k *= 2 ) < 1 ) return 0.5 * k * k * k;
return 0.5 * ( ( k -= 2 ) * k * k + 2 );
}
},
Quartic: {
In: function ( k ) {
return k * k * k * k;
},
Out: function ( k ) {
return 1 - ( --k * k * k * k );
},
InOut: function ( k ) {
if ( ( k *= 2 ) < 1) return 0.5 * k * k * k * k;
return - 0.5 * ( ( k -= 2 ) * k * k * k - 2 );
}
},
Quintic: {
In: function ( k ) {
return k * k * k * k * k;
},
Out: function ( k ) {
return --k * k * k * k * k + 1;
},
InOut: function ( k ) {
if ( ( k *= 2 ) < 1 ) return 0.5 * k * k * k * k * k;
return 0.5 * ( ( k -= 2 ) * k * k * k * k + 2 );
}
},
Sinusoidal: {
In: function ( k ) {
return 1 - Math.cos( k * Math.PI / 2 );
},
Out: function ( k ) {
return Math.sin( k * Math.PI / 2 );
},
InOut: function ( k ) {
return 0.5 * ( 1 - Math.cos( Math.PI * k ) );
}
},
Exponential: {
In: function ( k ) {
return k === 0 ? 0 : Math.pow( 1024, k - 1 );
},
Out: function ( k ) {
return k === 1 ? 1 : 1 - Math.pow( 2, - 10 * k );
},
InOut: function ( k ) {
if ( k === 0 ) return 0;
if ( k === 1 ) return 1;
if ( ( k *= 2 ) < 1 ) return 0.5 * Math.pow( 1024, k - 1 );
return 0.5 * ( - Math.pow( 2, - 10 * ( k - 1 ) ) + 2 );
}
},
Circular: {
In: function ( k ) {
return 1 - Math.sqrt( 1 - k * k );
},
Out: function ( k ) {
return Math.sqrt( 1 - ( --k * k ) );
},
InOut: function ( k ) {
if ( ( k *= 2 ) < 1) return - 0.5 * ( Math.sqrt( 1 - k * k) - 1);
return 0.5 * ( Math.sqrt( 1 - ( k -= 2) * k) + 1);
}
},
Elastic: {
In: function ( k ) {
var s, a = 0.1, p = 0.4;
if ( k === 0 ) return 0;
if ( k === 1 ) return 1;
if ( !a || a < 1 ) { a = 1; s = p / 4; }
else s = p * Math.asin( 1 / a ) / ( 2 * Math.PI );
return - ( a * Math.pow( 2, 10 * ( k -= 1 ) ) * Math.sin( ( k - s ) * ( 2 * Math.PI ) / p ) );
},
Out: function ( k ) {
var s, a = 0.1, p = 0.4;
if ( k === 0 ) return 0;
if ( k === 1 ) return 1;
if ( !a || a < 1 ) { a = 1; s = p / 4; }
else s = p * Math.asin( 1 / a ) / ( 2 * Math.PI );
return ( a * Math.pow( 2, - 10 * k) * Math.sin( ( k - s ) * ( 2 * Math.PI ) / p ) + 1 );
},
InOut: function ( k ) {
var s, a = 0.1, p = 0.4;
if ( k === 0 ) return 0;
if ( k === 1 ) return 1;
if ( !a || a < 1 ) { a = 1; s = p / 4; }
else s = p * Math.asin( 1 / a ) / ( 2 * Math.PI );
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;
}
},
Back: {
In: function ( k ) {
var s = 1.70158;
return k * k * ( ( s + 1 ) * k - s );
},
Out: function ( k ) {
var s = 1.70158;
return --k * k * ( ( s + 1 ) * k + s ) + 1;
},
InOut: 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 );
}
},
Bounce: {
In: function ( k ) {
return 1 - TWEEN.Easing.Bounce.Out( 1 - k );
},
Out: function ( k ) {
if ( k < ( 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;
}
},
InOut: function ( k ) {
if ( k < 0.5 ) return TWEEN.Easing.Bounce.In( k * 2 ) * 0.5;
return TWEEN.Easing.Bounce.Out( k * 2 - 1 ) * 0.5 + 0.5;
}
}
};
TWEEN.Interpolation = {
Linear: function ( v, k ) {
var m = v.length - 1, f = m * k, i = Math.floor( f ), fn = TWEEN.Interpolation.Utils.Linear;
if ( k < 0 ) return fn( v[ 0 ], v[ 1 ], f );
if ( k > 1 ) return fn( v[ m ], v[ m - 1 ], m - f );
return fn( v[ i ], v[ i + 1 > m ? m : i + 1 ], f - i );
},
Bezier: function ( v, k ) {
var b = 0, n = v.length - 1, pw = Math.pow, bn = TWEEN.Interpolation.Utils.Bernstein, i;
for ( i = 0; i <= n; i++ ) {
b += pw( 1 - k, n - i ) * pw( k, i ) * v[ i ] * bn( n, i );
}
return b;
},
CatmullRom: function ( v, k ) {
var m = v.length - 1, f = m * k, i = Math.floor( f ), fn = TWEEN.Interpolation.Utils.CatmullRom;
if ( v[ 0 ] === v[ m ] ) {
if ( k < 0 ) i = Math.floor( f = m * ( 1 + k ) );
return fn( v[ ( i - 1 + m ) % m ], v[ i ], v[ ( i + 1 ) % m ], v[ ( i + 2 ) % m ], f - i );
} else {
if ( k < 0 ) return v[ 0 ] - ( fn( v[ 0 ], v[ 0 ], v[ 1 ], v[ 1 ], -f ) - v[ 0 ] );
if ( k > 1 ) return v[ m ] - ( fn( v[ m ], v[ m ], v[ m - 1 ], v[ m - 1 ], f - m ) - v[ m ] );
return fn( v[ i ? i - 1 : 0 ], v[ i ], v[ m < i + 1 ? m : i + 1 ], v[ m < i + 2 ? m : i + 2 ], f - i );
}
},
Utils: {
Linear: function ( p0, p1, t ) {
return ( p1 - p0 ) * t + p0;
},
Bernstein: function ( n , i ) {
var fc = TWEEN.Interpolation.Utils.Factorial;
return fc( n ) / fc( i ) / fc( n - i );
},
Factorial: ( function () {
var a = [ 1 ];
return function ( n ) {
var s = 1, i;
if ( a[ n ] ) return a[ n ];
for ( i = n; i > 1; i-- ) s *= i;
return a[ n ] = s;
};
} )(),
CatmullRom: function ( p0, p1, p2, p3, t ) {
var v0 = ( p2 - p0 ) * 0.5, v1 = ( p3 - p1 ) * 0.5, t2 = t * t, t3 = t * t2;
return ( 2 * p1 - 2 * p2 + v0 + v1 ) * t3 + ( - 3 * p1 + 3 * p2 - 2 * v0 - v1 ) * t2 + v0 * t + p1;
}
}
};
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