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web3d / node_modules /@tweenjs /tween.js /src /Tween.js
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/**
 * 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!
 */
var _Group = function () {
 this._tweens = {};
 this._tweensAddedDuringUpdate = {};
};
_Group.prototype = {
 getAll: function () {
return Object.keys(this._tweens).map(function (tweenId) {
 return this._tweens[tweenId];
 }.bind(this));
},
removeAll: function () {
this._tweens = {};
},
add: function (tween) {
this._tweens[tween.getId()] = tween;
 this._tweensAddedDuringUpdate[tween.getId()] = tween;
},
remove: function (tween) {
delete this._tweens[tween.getId()];
 delete this._tweensAddedDuringUpdate[tween.getId()];
},
update: function (time, preserve) {
var tweenIds = Object.keys(this._tweens);
if (tweenIds.length === 0) {
 return false;
 }
time = time !== undefined ? time : TWEEN.now();
// Tweens are updated in "batches". If you add a new tween during an update, then the
 // new tween will be updated in the next batch.
 // If you remove a tween during an update, it may or may not be updated. However,
 // if the removed tween was added during the current batch, then it will not be updated.
 while (tweenIds.length > 0) {
 this._tweensAddedDuringUpdate = {};
for (var i = 0; i < tweenIds.length; i++) {
var tween = this._tweens[tweenIds[i]];
if (tween && tween.update(time) === false) {
 tween._isPlaying = false;
if (!preserve) {
 delete this._tweens[tweenIds[i]];
 }
 }
 }
tweenIds = Object.keys(this._tweensAddedDuringUpdate);
 }
return true;
}
};
var TWEEN = new _Group();
TWEEN.Group = _Group;
TWEEN._nextId = 0;
TWEEN.nextId = function () {
 return TWEEN._nextId++;
};
// Include a performance.now polyfill.
// In node.js, use process.hrtime.
if (typeof (window) === 'undefined' && typeof (process) !== 'undefined' && process.hrtime) {
 TWEEN.now = function () {
 var time = process.hrtime();
// Convert [seconds, nanoseconds] to milliseconds.
 return time[0] * 1000 + time[1] / 1000000;
 };
}
// In a browser, use window.performance.now if it is available.
else if (typeof (window) !== 'undefined' &&
 window.performance !== undefined &&
 window.performance.now !== undefined) {
 // This must be bound, because directly assigning this function
 // leads to an invocation exception in Chrome.
 TWEEN.now = window.performance.now.bind(window.performance);
}
// Use Date.now if it is available.
else if (Date.now !== undefined) {
 TWEEN.now = Date.now;
}
// Otherwise, use 'new Date().getTime()'.
else {
 TWEEN.now = function () {
 return new Date().getTime();
 };
}
TWEEN.Tween = function (object, group) {
 this._object = object;
 this._valuesStart = {};
 this._valuesEnd = {};
 this._valuesStartRepeat = {};
 this._duration = 1000;
 this._repeat = 0;
 this._repeatDelayTime = undefined;
 this._yoyo = false;
 this._isPlaying = false;
 this._reversed = false;
 this._delayTime = 0;
 this._startTime = null;
 this._easingFunction = TWEEN.Easing.Linear.None;
 this._interpolationFunction = TWEEN.Interpolation.Linear;
 this._chainedTweens = [];
 this._onStartCallback = null;
 this._onStartCallbackFired = false;
 this._onUpdateCallback = null;
 this._onCompleteCallback = null;
 this._onStopCallback = null;
 this._group = group || TWEEN;
 this._id = TWEEN.nextId();
};
TWEEN.Tween.prototype = {
 getId: function getId() {
 return this._id;
 },
isPlaying: function isPlaying() {
 return this._isPlaying;
 },
to: function to(properties, duration) {
this._valuesEnd = properties;
if (duration !== undefined) {
 this._duration = duration;
 }
return this;
},
start: function start(time) {
this._group.add(this);
this._isPlaying = true;
this._onStartCallbackFired = false;
this._startTime = time !== undefined ? typeof time === 'string' ? TWEEN.now() + parseFloat(time) : time : TWEEN.now();
 this._startTime += this._delayTime;
for (var property in this._valuesEnd) {
// Check if an Array was provided as property value
 if (this._valuesEnd[property] instanceof Array) {
if (this._valuesEnd[property].length === 0) {
 continue;
 }
// Create a local copy of the Array with the start value at the front
 this._valuesEnd[property] = [this._object[property]].concat(this._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 (this._object[property] === undefined) {
 continue;
 }
// Save the starting value.
 this._valuesStart[property] = this._object[property];
if ((this._valuesStart[property] instanceof Array) === false) {
 this._valuesStart[property] *= 1.0; // Ensures we're using numbers, not strings
 }
this._valuesStartRepeat[property] = this._valuesStart[property] || 0;
}
return this;
},
stop: function stop() {
if (!this._isPlaying) {
 return this;
 }
this._group.remove(this);
 this._isPlaying = false;
if (this._onStopCallback !== null) {
 this._onStopCallback(this._object);
 }
this.stopChainedTweens();
 return this;
},
end: function end() {
this.update(this._startTime + this._duration);
 return this;
},
stopChainedTweens: function stopChainedTweens() {
for (var i = 0, numChainedTweens = this._chainedTweens.length; i < numChainedTweens; i++) {
 this._chainedTweens[i].stop();
 }
},
group: function group(group) {
 this._group = group;
 return this;
 },
delay: function delay(amount) {
this._delayTime = amount;
 return this;
},
repeat: function repeat(times) {
this._repeat = times;
 return this;
},
repeatDelay: function repeatDelay(amount) {
this._repeatDelayTime = amount;
 return this;
},
yoyo: function yoyo(yy) {
this._yoyo = yy;
 return this;
},
easing: function easing(eas) {
this._easingFunction = eas;
 return this;
},
interpolation: function interpolation(inter) {
this._interpolationFunction = inter;
 return this;
},
chain: function chain() {
this._chainedTweens = arguments;
 return this;
},
onStart: function onStart(callback) {
this._onStartCallback = callback;
 return this;
},
onUpdate: function onUpdate(callback) {
this._onUpdateCallback = callback;
 return this;
},
onComplete: function onComplete(callback) {
this._onCompleteCallback = callback;
 return this;
},
onStop: function onStop(callback) {
this._onStopCallback = callback;
 return this;
},
update: function update(time) {
var property;
 var elapsed;
 var value;
if (time < this._startTime) {
 return true;
 }
if (this._onStartCallbackFired === false) {
if (this._onStartCallback !== null) {
 this._onStartCallback(this._object);
 }
this._onStartCallbackFired = true;
 }
elapsed = (time - this._startTime) / this._duration;
 elapsed = (this._duration === 0 || elapsed > 1) ? 1 : elapsed;
value = this._easingFunction(elapsed);
for (property in this._valuesEnd) {
// Don't update properties that do not exist in the source object
 if (this._valuesStart[property] === undefined) {
 continue;
 }
var start = this._valuesStart[property] || 0;
 var end = this._valuesEnd[property];
if (end instanceof Array) {
this._object[property] = this._interpolationFunction(end, value);
} else {
// Parses relative end values with start as base (e.g.: +10, -3)
 if (typeof (end) === 'string') {
if (end.charAt(0) === '+' || end.charAt(0) === '-') {
 end = start + parseFloat(end);
 } else {
 end = parseFloat(end);
 }
 }
// Protect against non numeric properties.
 if (typeof (end) === 'number') {
 this._object[property] = start + (end - start) * value;
 }
}
}
if (this._onUpdateCallback !== null) {
 this._onUpdateCallback(this._object);
 }
if (elapsed === 1) {
if (this._repeat > 0) {
if (isFinite(this._repeat)) {
 this._repeat--;
 }
// Reassign starting values, restart by making startTime = now
 for (property in this._valuesStartRepeat) {
if (typeof (this._valuesEnd[property]) === 'string') {
 this._valuesStartRepeat[property] = this._valuesStartRepeat[property] + parseFloat(this._valuesEnd[property]);
 }
if (this._yoyo) {
 var tmp = this._valuesStartRepeat[property];
this._valuesStartRepeat[property] = this._valuesEnd[property];
 this._valuesEnd[property] = tmp;
 }
this._valuesStart[property] = this._valuesStartRepeat[property];
}
if (this._yoyo) {
 this._reversed = !this._reversed;
 }
if (this._repeatDelayTime !== undefined) {
 this._startTime = time + this._repeatDelayTime;
 } else {
 this._startTime = time + this._delayTime;
 }
return true;
} else {
if (this._onCompleteCallback !== null) {
this._onCompleteCallback(this._object);
 }
for (var i = 0, numChainedTweens = this._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
 this._chainedTweens[i].start(this._startTime + this._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) {
if (k === 0) {
 return 0;
 }
if (k === 1) {
 return 1;
 }
return -Math.pow(2, 10 * (k - 1)) * Math.sin((k - 1.1) * 5 * Math.PI);
},
Out: function (k) {
if (k === 0) {
 return 0;
 }
if (k === 1) {
 return 1;
 }
return Math.pow(2, -10 * k) * Math.sin((k - 0.1) * 5 * Math.PI) + 1;
},
InOut: function (k) {
if (k === 0) {
 return 0;
 }
if (k === 1) {
 return 1;
 }
k *= 2;
if (k < 1) {
 return -0.5 * Math.pow(2, 10 * (k - 1)) * Math.sin((k - 1.1) * 5 * Math.PI);
 }
return 0.5 * Math.pow(2, -10 * (k - 1)) * Math.sin((k - 1.1) * 5 * Math.PI) + 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);