/**
* Tween.js - Licensed under the MIT license
* https://github.com/tweenjs/tween.js
* ----------------------------------------------
*
* See https://github.com/tweenjs/tween.js/graphs/contributors for the full list of contributors.
* Thank you all, you're awesome!
*/
// Include a performance.now polyfill
(function () {
if ('performance' in window === false) {
window.performance = {};
}
// IE 8
Date.now = (Date.now || function () {
return new Date().getTime();
});
if ('now' in window.performance === false) {
var offset = window.performance.timing && window.performance.timing.navigationStart ? window.performance.timing.navigationStart
: Date.now();
window.performance.now = function () {
return Date.now() - offset;
};
}
})();
var TWEEN = TWEEN || (function () {
var _tweens = [];
return {
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;
time = time !== undefined ? time : window.performance.now();
while (i < _tweens.length) {
if (_tweens[i].update(time)) {
i++;
} else {
_tweens.splice(i, 1);
}
}
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 _isPlaying = 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;
var _onStopCallback = 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);
_isPlaying = true;
_onStartCallbackFired = false;
_startTime = time !== undefined ? time : window.performance.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]);
}
// If `to()` specifies a property that doesn't exist in the source object,
// we should not set that property in the object
if (_valuesStart[property] === undefined) {
continue;
}
_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 () {
if (!_isPlaying) {
return this;
}
TWEEN.remove(this);
_isPlaying = false;
if (_onStopCallback !== null) {
_onStopCallback.call(_object);
}
this.stopChainedTweens();
return this;
};
this.stopChainedTweens = function () {
for (var i = 0, numChainedTweens = _chainedTweens.length; i < numChainedTweens; i++) {
_chainedTweens[i].stop();
}
};
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.onStop = function (callback) {
_onStopCallback = callback;
return this;
};
this.update = function (time) {
var property;
var elapsed;
var value;
if (time < _startTime) {
return true;
}
if (_onStartCallbackFired === false) {
if (_onStartCallback !== null) {
_onStartCallback.call(_object);
}
_onStartCallbackFired = true;
}
elapsed = (time - _startTime) / _duration;
elapsed = elapsed > 1 ? 1 : elapsed;
value = _easingFunction(elapsed);
for (property in _valuesEnd) {
// Don't update properties that do not exist in the source object
if (_valuesStart[property] === undefined) {
continue;
}
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') {
if (end.startsWith('+') || end.startsWith('-')) {
end = start + parseFloat(end, 10);
} else {
end = 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;
}
_valuesStart[property] = _valuesStartRepeat[property];
}
if (_yoyo) {
_reversed = !_reversed;
}
_startTime = time + _delayTime;
return true;
} else {
if (_onCompleteCallback !== null) {
_onCompleteCallback.call(_object);
}
for (var i = 0, numChainedTweens = _chainedTweens.length; i < numChainedTweens; i++) {
// Make the chained tweens start exactly at the time they should,
// even if the `update()` method was called way past the duration of the tween
_chainedTweens[i].start(_startTime + _duration);
}
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;
var a = 0.1;
var 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;
var a = 0.1;
var 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;
var a = 0.1;
var 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;
var f = m * k;
var i = Math.floor(f);
var 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;
var n = v.length - 1;
var pw = Math.pow;
var bn = TWEEN.Interpolation.Utils.Bernstein;
for (var 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;
var f = m * k;
var i = Math.floor(f);
var 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;
if (a[n]) {
return a[n];
}
for (var i = n; i > 1; i--) {
s *= i;
}
a[n] = s;
return s;
};
})(),
CatmullRom: function (p0, p1, p2, p3, t) {
var v0 = (p2 - p0) * 0.5;
var v1 = (p3 - p1) * 0.5;
var t2 = t * t;
var t3 = t * t2;
return (2 * p1 - 2 * p2 + v0 + v1) * t3 + (- 3 * p1 + 3 * p2 - 2 * v0 - v1) * t2 + v0 * t + p1;
}
}
};
// UMD (Universal Module Definition)
(function (root) {
if (typeof define === 'function' && define.amd) {
// AMD
define([], function () {
return TWEEN;
});
} else if (typeof module !== 'undefined' && typeof exports === 'object') {
// Node.js
module.exports = TWEEN;
} else if (root !== undefined) {
// Global variable
root.TWEEN = TWEEN;
}
})(this);