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js/tween.umd.js

@@ -0,0 +1,801 @@
+(function (global, factory) {
+    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
+    typeof define === 'function' && define.amd ? define(factory) :
+    (global.TWEEN = factory());
+}(this, (function () { 'use strict';
+
+    var NOW;
+    // Include a performance.now polyfill.
+    // In node.js, use process.hrtime.
+    // eslint-disable-next-line
+    // @ts-ignore
+    if (typeof self === 'undefined' && typeof process !== 'undefined' && process.hrtime) {
+        NOW = function () {
+            // eslint-disable-next-line
+            // @ts-ignore
+            var time = process.hrtime();
+            // Convert [seconds, nanoseconds] to milliseconds.
+            return time[0] * 1000 + time[1] / 1000000;
+        };
+    }
+    // In a browser, use self.performance.now if it is available.
+    else if (typeof self !== 'undefined' && self.performance !== undefined && self.performance.now !== undefined) {
+        // This must be bound, because directly assigning this function
+        // leads to an invocation exception in Chrome.
+        NOW = self.performance.now.bind(self.performance);
+    }
+    // Use Date.now if it is available.
+    else if (Date.now !== undefined) {
+        NOW = Date.now;
+    }
+    // Otherwise, use 'new Date().getTime()'.
+    else {
+        NOW = function () {
+            return new Date().getTime();
+        };
+    }
+    var NOW$1 = NOW;
+
+    /**
+     * Controlling groups of tweens
+     *
+     * Using the TWEEN singleton to manage your tweens can cause issues in large apps with many components.
+     * In these cases, you may want to create your own smaller groups of tween
+     */
+    var Group = /** @class */ (function () {
+        function Group() {
+            this._tweens = {};
+            this._tweensAddedDuringUpdate = {};
+        }
+        Group.prototype.getAll = function () {
+            var _this = this;
+            return Object.keys(this._tweens).map(function (tweenId) {
+                return _this._tweens[tweenId];
+            });
+        };
+        Group.prototype.removeAll = function () {
+            this._tweens = {};
+        };
+        Group.prototype.add = function (tween) {
+            this._tweens[tween.getId()] = tween;
+            this._tweensAddedDuringUpdate[tween.getId()] = tween;
+        };
+        Group.prototype.remove = function (tween) {
+            delete this._tweens[tween.getId()];
+            delete this._tweensAddedDuringUpdate[tween.getId()];
+        };
+        Group.prototype.update = function (time, preserve) {
+            var tweenIds = Object.keys(this._tweens);
+            if (tweenIds.length === 0) {
+                return false;
+            }
+            time = time !== undefined ? time : NOW$1();
+            // 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 && !preserve) {
+                        delete this._tweens[tweenIds[i]];
+                    }
+                }
+                tweenIds = Object.keys(this._tweensAddedDuringUpdate);
+            }
+            return true;
+        };
+        return Group;
+    }());
+
+    /**
+     * The Ease class provides a collection of easing functions for use with tween.js.
+     */
+    var Easing = {
+        Linear: {
+            None: function (amount) {
+                return amount;
+            },
+        },
+        Quadratic: {
+            In: function (amount) {
+                return amount * amount;
+            },
+            Out: function (amount) {
+                return amount * (2 - amount);
+            },
+            InOut: function (amount) {
+                if ((amount *= 2) < 1) {
+                    return 0.5 * amount * amount;
+                }
+                return -0.5 * (--amount * (amount - 2) - 1);
+            },
+        },
+        Cubic: {
+            In: function (amount) {
+                return amount * amount * amount;
+            },
+            Out: function (amount) {
+                return --amount * amount * amount + 1;
+            },
+            InOut: function (amount) {
+                if ((amount *= 2) < 1) {
+                    return 0.5 * amount * amount * amount;
+                }
+                return 0.5 * ((amount -= 2) * amount * amount + 2);
+            },
+        },
+        Quartic: {
+            In: function (amount) {
+                return amount * amount * amount * amount;
+            },
+            Out: function (amount) {
+                return 1 - --amount * amount * amount * amount;
+            },
+            InOut: function (amount) {
+                if ((amount *= 2) < 1) {
+                    return 0.5 * amount * amount * amount * amount;
+                }
+                return -0.5 * ((amount -= 2) * amount * amount * amount - 2);
+            },
+        },
+        Quintic: {
+            In: function (amount) {
+                return amount * amount * amount * amount * amount;
+            },
+            Out: function (amount) {
+                return --amount * amount * amount * amount * amount + 1;
+            },
+            InOut: function (amount) {
+                if ((amount *= 2) < 1) {
+                    return 0.5 * amount * amount * amount * amount * amount;
+                }
+                return 0.5 * ((amount -= 2) * amount * amount * amount * amount + 2);
+            },
+        },
+        Sinusoidal: {
+            In: function (amount) {
+                return 1 - Math.cos((amount * Math.PI) / 2);
+            },
+            Out: function (amount) {
+                return Math.sin((amount * Math.PI) / 2);
+            },
+            InOut: function (amount) {
+                return 0.5 * (1 - Math.cos(Math.PI * amount));
+            },
+        },
+        Exponential: {
+            In: function (amount) {
+                return amount === 0 ? 0 : Math.pow(1024, amount - 1);
+            },
+            Out: function (amount) {
+                return amount === 1 ? 1 : 1 - Math.pow(2, -10 * amount);
+            },
+            InOut: function (amount) {
+                if (amount === 0) {
+                    return 0;
+                }
+                if (amount === 1) {
+                    return 1;
+                }
+                if ((amount *= 2) < 1) {
+                    return 0.5 * Math.pow(1024, amount - 1);
+                }
+                return 0.5 * (-Math.pow(2, -10 * (amount - 1)) + 2);
+            },
+        },
+        Circular: {
+            In: function (amount) {
+                return 1 - Math.sqrt(1 - amount * amount);
+            },
+            Out: function (amount) {
+                return Math.sqrt(1 - --amount * amount);
+            },
+            InOut: function (amount) {
+                if ((amount *= 2) < 1) {
+                    return -0.5 * (Math.sqrt(1 - amount * amount) - 1);
+                }
+                return 0.5 * (Math.sqrt(1 - (amount -= 2) * amount) + 1);
+            },
+        },
+        Elastic: {
+            In: function (amount) {
+                if (amount === 0) {
+                    return 0;
+                }
+                if (amount === 1) {
+                    return 1;
+                }
+                return -Math.pow(2, 10 * (amount - 1)) * Math.sin((amount - 1.1) * 5 * Math.PI);
+            },
+            Out: function (amount) {
+                if (amount === 0) {
+                    return 0;
+                }
+                if (amount === 1) {
+                    return 1;
+                }
+                return Math.pow(2, -10 * amount) * Math.sin((amount - 0.1) * 5 * Math.PI) + 1;
+            },
+            InOut: function (amount) {
+                if (amount === 0) {
+                    return 0;
+                }
+                if (amount === 1) {
+                    return 1;
+                }
+                amount *= 2;
+                if (amount < 1) {
+                    return -0.5 * Math.pow(2, 10 * (amount - 1)) * Math.sin((amount - 1.1) * 5 * Math.PI);
+                }
+                return 0.5 * Math.pow(2, -10 * (amount - 1)) * Math.sin((amount - 1.1) * 5 * Math.PI) + 1;
+            },
+        },
+        Back: {
+            In: function (amount) {
+                var s = 1.70158;
+                return amount * amount * ((s + 1) * amount - s);
+            },
+            Out: function (amount) {
+                var s = 1.70158;
+                return --amount * amount * ((s + 1) * amount + s) + 1;
+            },
+            InOut: function (amount) {
+                var s = 1.70158 * 1.525;
+                if ((amount *= 2) < 1) {
+                    return 0.5 * (amount * amount * ((s + 1) * amount - s));
+                }
+                return 0.5 * ((amount -= 2) * amount * ((s + 1) * amount + s) + 2);
+            },
+        },
+        Bounce: {
+            In: function (amount) {
+                return 1 - Easing.Bounce.Out(1 - amount);
+            },
+            Out: function (amount) {
+                if (amount < 1 / 2.75) {
+                    return 7.5625 * amount * amount;
+                }
+                else if (amount < 2 / 2.75) {
+                    return 7.5625 * (amount -= 1.5 / 2.75) * amount + 0.75;
+                }
+                else if (amount < 2.5 / 2.75) {
+                    return 7.5625 * (amount -= 2.25 / 2.75) * amount + 0.9375;
+                }
+                else {
+                    return 7.5625 * (amount -= 2.625 / 2.75) * amount + 0.984375;
+                }
+            },
+            InOut: function (amount) {
+                if (amount < 0.5) {
+                    return Easing.Bounce.In(amount * 2) * 0.5;
+                }
+                return Easing.Bounce.Out(amount * 2 - 1) * 0.5 + 0.5;
+            },
+        },
+    };
+
+    /**
+     *
+     */
+    var Interpolation = {
+        Linear: function (v, k) {
+            var m = v.length - 1;
+            var f = m * k;
+            var i = Math.floor(f);
+            var fn = 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 = 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 = 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 = 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;
+            },
+        },
+    };
+
+    /**
+     * Utils
+     */
+    var Sequence = /** @class */ (function () {
+        function Sequence() {
+        }
+        Sequence.nextId = function () {
+            return Sequence._nextId++;
+        };
+        Sequence._nextId = 0;
+        return Sequence;
+    }());
+
+    /**
+     * 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 Tween = /** @class */ (function () {
+        function Tween(_object, _group) {
+            if (_group === void 0) { _group = TWEEN; }
+            this._object = _object;
+            this._group = _group;
+            this._isPaused = false;
+            this._pauseStart = 0;
+            this._valuesStart = {};
+            this._valuesEnd = {};
+            this._valuesStartRepeat = {};
+            this._duration = 1000;
+            this._initialRepeat = 0;
+            this._repeat = 0;
+            this._yoyo = false;
+            this._isPlaying = false;
+            this._reversed = false;
+            this._delayTime = 0;
+            this._startTime = 0;
+            this._easingFunction = TWEEN.Easing.Linear.None;
+            this._interpolationFunction = TWEEN.Interpolation.Linear;
+            this._chainedTweens = [];
+            this._onStartCallbackFired = false;
+            this._id = TWEEN.nextId();
+            this._isChainStopped = false;
+        }
+        Tween.prototype.getId = function () {
+            return this._id;
+        };
+        Tween.prototype.isPlaying = function () {
+            return this._isPlaying;
+        };
+        Tween.prototype.isPaused = function () {
+            return this._isPaused;
+        };
+        Tween.prototype.to = function (properties, duration) {
+            // to (properties, duration) {
+            for (var prop in properties) {
+                this._valuesEnd[prop] = properties[prop];
+            }
+            if (duration !== undefined) {
+                this._duration = duration;
+            }
+            return this;
+        };
+        Tween.prototype.duration = function (d) {
+            this._duration = d;
+            return this;
+        };
+        Tween.prototype.start = function (time) {
+            if (this._isPlaying) {
+                return this;
+            }
+            // eslint-disable-next-line
+            // @ts-ignore FIXME?
+            this._group.add(this);
+            this._repeat = this._initialRepeat;
+            if (this._reversed) {
+                // If we were reversed (f.e. using the yoyo feature) then we need to
+                // flip the tween direction back to forward.
+                this._reversed = false;
+                for (var property in this._valuesStartRepeat) {
+                    this._swapEndStartRepeatValues(property);
+                    this._valuesStart[property] = this._valuesStartRepeat[property];
+                }
+            }
+            this._isPlaying = true;
+            this._isPaused = false;
+            this._onStartCallbackFired = false;
+            this._isChainStopped = false;
+            this._startTime =
+                time !== undefined ? (typeof time === 'string' ? TWEEN.now() + parseFloat(time) : time) : TWEEN.now();
+            this._startTime += this._delayTime;
+            this._setupProperties(this._object, this._valuesStart, this._valuesEnd, this._valuesStartRepeat);
+            return this;
+        };
+        Tween.prototype._setupProperties = function (_object, _valuesStart, _valuesEnd, _valuesStartRepeat) {
+            for (var property in _valuesEnd) {
+                var startValue = _object[property];
+                var startValueIsArray = Array.isArray(startValue);
+                var propType = startValueIsArray ? 'array' : typeof startValue;
+                var isInterpolationList = !startValueIsArray && Array.isArray(_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 (propType === 'undefined' || propType === 'function') {
+                    continue;
+                }
+                // Check if an Array was provided as property value
+                if (isInterpolationList) {
+                    var endValues = _valuesEnd[property];
+                    if (endValues.length === 0) {
+                        continue;
+                    }
+                    // handle an array of relative values
+                    endValues = endValues.map(this._handleRelativeValue.bind(this, startValue));
+                    // Create a local copy of the Array with the start value at the front
+                    _valuesEnd[property] = [startValue].concat(endValues);
+                }
+                // handle the deepness of the values
+                if ((propType === 'object' || startValueIsArray) && startValue && !isInterpolationList) {
+                    _valuesStart[property] = startValueIsArray ? [] : {};
+                    // eslint-disable-next-line
+                    for (var prop in startValue) {
+                        // eslint-disable-next-line
+                        // @ts-ignore FIXME?
+                        _valuesStart[property][prop] = startValue[prop];
+                    }
+                    _valuesStartRepeat[property] = startValueIsArray ? [] : {}; // TODO? repeat nested values? And yoyo? And array values?
+                    // eslint-disable-next-line
+                    // @ts-ignore FIXME?
+                    this._setupProperties(startValue, _valuesStart[property], _valuesEnd[property], _valuesStartRepeat[property]);
+                }
+                else {
+                    // Save the starting value, but only once.
+                    if (typeof _valuesStart[property] === 'undefined') {
+                        _valuesStart[property] = startValue;
+                    }
+                    if (!startValueIsArray) {
+                        // eslint-disable-next-line
+                        // @ts-ignore FIXME?
+                        _valuesStart[property] *= 1.0; // Ensures we're using numbers, not strings
+                    }
+                    if (isInterpolationList) {
+                        // eslint-disable-next-line
+                        // @ts-ignore FIXME?
+                        _valuesStartRepeat[property] = _valuesEnd[property].slice().reverse();
+                    }
+                    else {
+                        _valuesStartRepeat[property] = _valuesStart[property] || 0;
+                    }
+                }
+            }
+        };
+        Tween.prototype.stop = function () {
+            if (!this._isChainStopped) {
+                this._isChainStopped = true;
+                this.stopChainedTweens();
+            }
+            if (!this._isPlaying) {
+                return this;
+            }
+            // eslint-disable-next-line
+            // @ts-ignore FIXME?
+            this._group.remove(this);
+            this._isPlaying = false;
+            this._isPaused = false;
+            if (this._onStopCallback) {
+                this._onStopCallback(this._object);
+            }
+            return this;
+        };
+        Tween.prototype.end = function () {
+            this.update(Infinity);
+            return this;
+        };
+        Tween.prototype.pause = function (time) {
+            if (this._isPaused || !this._isPlaying) {
+                return this;
+            }
+            this._isPaused = true;
+            this._pauseStart = time === undefined ? TWEEN.now() : time;
+            // eslint-disable-next-line
+            // @ts-ignore FIXME?
+            this._group.remove(this);
+            return this;
+        };
+        Tween.prototype.resume = function (time) {
+            if (!this._isPaused || !this._isPlaying) {
+                return this;
+            }
+            this._isPaused = false;
+            this._startTime += (time === undefined ? TWEEN.now() : time) - this._pauseStart;
+            this._pauseStart = 0;
+            // eslint-disable-next-line
+            // @ts-ignore FIXME?
+            this._group.add(this);
+            return this;
+        };
+        Tween.prototype.stopChainedTweens = function () {
+            for (var i = 0, numChainedTweens = this._chainedTweens.length; i < numChainedTweens; i++) {
+                this._chainedTweens[i].stop();
+            }
+            return this;
+        };
+        Tween.prototype.group = function (group) {
+            this._group = group;
+            return this;
+        };
+        Tween.prototype.delay = function (amount) {
+            this._delayTime = amount;
+            return this;
+        };
+        Tween.prototype.repeat = function (times) {
+            this._initialRepeat = times;
+            this._repeat = times;
+            return this;
+        };
+        Tween.prototype.repeatDelay = function (amount) {
+            this._repeatDelayTime = amount;
+            return this;
+        };
+        Tween.prototype.yoyo = function (yoyo) {
+            this._yoyo = yoyo;
+            return this;
+        };
+        Tween.prototype.easing = function (easingFunction) {
+            this._easingFunction = easingFunction;
+            return this;
+        };
+        Tween.prototype.interpolation = function (interpolationFunction) {
+            this._interpolationFunction = interpolationFunction;
+            return this;
+        };
+        Tween.prototype.chain = function () {
+            var tweens = [];
+            for (var _i = 0; _i < arguments.length; _i++) {
+                tweens[_i] = arguments[_i];
+            }
+            this._chainedTweens = tweens;
+            return this;
+        };
+        Tween.prototype.onStart = function (callback) {
+            this._onStartCallback = callback;
+            return this;
+        };
+        Tween.prototype.onUpdate = function (callback) {
+            this._onUpdateCallback = callback;
+            return this;
+        };
+        Tween.prototype.onRepeat = function (callback) {
+            this._onRepeatCallback = callback;
+            return this;
+        };
+        Tween.prototype.onComplete = function (callback) {
+            this._onCompleteCallback = callback;
+            return this;
+        };
+        Tween.prototype.onStop = function (callback) {
+            this._onStopCallback = callback;
+            return this;
+        };
+        Tween.prototype.update = function (time) {
+            var property;
+            var elapsed;
+            var endTime = this._startTime + this._duration;
+            if (time > endTime && !this._isPlaying) {
+                return false;
+            }
+            // If the tween was already finished,
+            if (!this.isPlaying) {
+                this.start(time);
+            }
+            if (time < this._startTime) {
+                return true;
+            }
+            if (this._onStartCallbackFired === false) {
+                if (this._onStartCallback) {
+                    this._onStartCallback(this._object);
+                }
+                this._onStartCallbackFired = true;
+            }
+            elapsed = (time - this._startTime) / this._duration;
+            elapsed = this._duration === 0 || elapsed > 1 ? 1 : elapsed;
+            var value = this._easingFunction(elapsed);
+            // properties transformations
+            this._updateProperties(this._object, this._valuesStart, this._valuesEnd, value);
+            if (this._onUpdateCallback) {
+                this._onUpdateCallback(this._object, elapsed);
+            }
+            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 (!this._yoyo && typeof this._valuesEnd[property] === 'string') {
+                            this._valuesStartRepeat[property] =
+                                // eslint-disable-next-line
+                                // @ts-ignore FIXME?
+                                this._valuesStartRepeat[property] + parseFloat(this._valuesEnd[property]);
+                        }
+                        if (this._yoyo) {
+                            this._swapEndStartRepeatValues(property);
+                        }
+                        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;
+                    }
+                    if (this._onRepeatCallback) {
+                        this._onRepeatCallback(this._object);
+                    }
+                    return true;
+                }
+                else {
+                    if (this._onCompleteCallback) {
+                        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);
+                    }
+                    this._isPlaying = false;
+                    return false;
+                }
+            }
+            return true;
+        };
+        Tween.prototype._updateProperties = function (_object, _valuesStart, _valuesEnd, value) {
+            for (var 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];
+                var startIsArray = Array.isArray(_object[property]);
+                var endIsArray = Array.isArray(end);
+                var isInterpolationList = !startIsArray && endIsArray;
+                if (isInterpolationList) {
+                    _object[property] = this._interpolationFunction(end, value);
+                }
+                else if (typeof end === 'object' && end) {
+                    // eslint-disable-next-line
+                    // @ts-ignore FIXME?
+                    this._updateProperties(_object[property], start, end, value);
+                }
+                else {
+                    // Parses relative end values with start as base (e.g.: +10, -3)
+                    end = this._handleRelativeValue(start, end);
+                    // Protect against non numeric properties.
+                    if (typeof end === 'number') {
+                        // eslint-disable-next-line
+                        // @ts-ignore FIXME?
+                        _object[property] = start + (end - start) * value;
+                    }
+                }
+            }
+        };
+        Tween.prototype._handleRelativeValue = function (start, end) {
+            if (typeof end !== 'string') {
+                return end;
+            }
+            if (end.charAt(0) === '+' || end.charAt(0) === '-') {
+                return start + parseFloat(end);
+            }
+            else {
+                return parseFloat(end);
+            }
+        };
+        Tween.prototype._swapEndStartRepeatValues = function (property) {
+            var tmp = this._valuesStartRepeat[property];
+            if (typeof this._valuesEnd[property] === 'string') {
+                // eslint-disable-next-line
+                // @ts-ignore FIXME?
+                this._valuesStartRepeat[property] = this._valuesStartRepeat[property] + parseFloat(this._valuesEnd[property]);
+            }
+            else {
+                this._valuesStartRepeat[property] = this._valuesEnd[property];
+            }
+            this._valuesEnd[property] = tmp;
+        };
+        return Tween;
+    }());
+
+    var VERSION = '18.5.0';
+
+    /**
+     * 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 __extends = (this && this.__extends) || (function () {
+        var extendStatics = function (d, b) {
+            extendStatics = Object.setPrototypeOf ||
+                ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
+                function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
+            return extendStatics(d, b);
+        };
+        return function (d, b) {
+            extendStatics(d, b);
+            function __() { this.constructor = d; }
+            d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+        };
+    })();
+    /**
+     * Controlling groups of tweens
+     *
+     * Using the TWEEN singleton to manage your tweens can cause issues in large apps with many components.
+     * In these cases, you may want to create your own smaller groups of tween
+     */
+    var Main = /** @class */ (function (_super) {
+        __extends(Main, _super);
+        function Main() {
+            var _this = _super !== null && _super.apply(this, arguments) || this;
+            _this.version = VERSION;
+            _this.now = NOW$1;
+            _this.Group = Group;
+            _this.Easing = Easing;
+            _this.Interpolation = Interpolation;
+            _this.nextId = Sequence.nextId;
+            _this.Tween = Tween;
+            return _this;
+        }
+        return Main;
+    }(Group));
+    var TWEEN = new Main();
+
+    return TWEEN;
+
+})));

nanjing.html

@@ -108,7 +108,10 @@
 
     <div class="ctrlBtn"></div>
 
-   <script src="app.min.js"></script> 
+ <script src="js/three.min.js"></script> 
+  <script src="js/tween.umd.js"></script> 
+
+   <script src="main.js"></script> 
 
     <script type="text/javaScript">