1 | ;
|
2 | Object.defineProperty(exports, "__esModule", { value: true });
|
3 | var index_1 = require("../index");
|
4 | var concat_1 = require("./concat");
|
5 | function interpolate(y, from, to) {
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6 | return (from * (1 - y) + to * y);
|
7 | }
|
8 | function flip(fn) {
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9 | return function (x) { return 1 - fn(1 - x); };
|
10 | }
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11 | function createEasing(fn) {
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12 | var fnFlipped = flip(fn);
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13 | return {
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14 | easeIn: function (x, from, to) {
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15 | return interpolate(fn(x), from, to);
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16 | },
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17 | easeOut: function (x, from, to) {
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18 | return interpolate(fnFlipped(x), from, to);
|
19 | },
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20 | easeInOut: function (x, from, to) {
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21 | var y = (x < 0.5) ?
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22 | (fn(2 * x) * 0.5) :
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23 | (0.5 + fnFlipped(2 * (x - 0.5)) * 0.5);
|
24 | return interpolate(y, from, to);
|
25 | }
|
26 | };
|
27 | }
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28 | var easingPower2 = createEasing(function (x) { return x * x; });
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29 | var easingPower3 = createEasing(function (x) { return x * x * x; });
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30 | var easingPower4 = createEasing(function (x) {
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31 | var xx = x * x;
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32 | return xx * xx;
|
33 | });
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34 | var EXP_WEIGHT = 6;
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35 | var EXP_MAX = Math.exp(EXP_WEIGHT) - 1;
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36 | function expFn(x) {
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37 | return (Math.exp(x * EXP_WEIGHT) - 1) / EXP_MAX;
|
38 | }
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39 | var easingExponential = createEasing(expFn);
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40 | var OVERSHOOT = 1.70158;
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41 | var easingBack = createEasing(function (x) { return x * x * ((OVERSHOOT + 1) * x - OVERSHOOT); });
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42 | var PARAM1 = 7.5625;
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43 | var PARAM2 = 2.75;
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44 | function easeOutFn(x) {
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45 | var z = x;
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46 | if (z < 1 / PARAM2) {
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47 | return (PARAM1 * z * z);
|
48 | }
|
49 | else if (z < 2 / PARAM2) {
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50 | return (PARAM1 * (z -= 1.5 / PARAM2) * z + 0.75);
|
51 | }
|
52 | else if (z < 2.5 / PARAM2) {
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53 | return (PARAM1 * (z -= 2.25 / PARAM2) * z + 0.9375);
|
54 | }
|
55 | else {
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56 | return (PARAM1 * (z -= 2.625 / PARAM2) * z + 0.984375);
|
57 | }
|
58 | }
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59 | var easingBounce = createEasing(function (x) { return 1 - easeOutFn(1 - x); });
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60 | var easingCirc = createEasing(function (x) { return -(Math.sqrt(1 - x * x) - 1); });
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61 | var PERIOD = 0.3;
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62 | var OVERSHOOT_ELASTIC = PERIOD / 4;
|
63 | var AMPLITUDE = 1;
|
64 | function elasticIn(x) {
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65 | var z = x;
|
66 | if (z <= 0) {
|
67 | return 0;
|
68 | }
|
69 | else if (z >= 1) {
|
70 | return 1;
|
71 | }
|
72 | else {
|
73 | z -= 1;
|
74 | return -(AMPLITUDE * Math.pow(2, 10 * z))
|
75 | * Math.sin((z - OVERSHOOT_ELASTIC) * (2 * Math.PI) / PERIOD);
|
76 | }
|
77 | }
|
78 | var easingElastic = createEasing(elasticIn);
|
79 | var HALF_PI = Math.PI * 0.5;
|
80 | var easingSine = createEasing(function (x) { return 1 - Math.cos(x * HALF_PI); });
|
81 | var DEFAULT_INTERVAL = 15;
|
82 | /**
|
83 | * Creates a stream of numbers emitted in a quick burst, following a numeric
|
84 | * function like sine or elastic or quadratic. tween() is meant for creating
|
85 | * streams for animations.
|
86 | *
|
87 | * Example:
|
88 | *
|
89 | * ```js
|
90 | * import tween from 'xstream/extra/tween'
|
91 | *
|
92 | * const stream = tween({
|
93 | * from: 20,
|
94 | * to: 100,
|
95 | * ease: tween.exponential.easeIn,
|
96 | * duration: 1000, // milliseconds
|
97 | * })
|
98 | *
|
99 | * stream.addListener({
|
100 | * next: (x) => console.log(x),
|
101 | * error: (err) => console.error(err),
|
102 | * complete: () => console.log('concat completed'),
|
103 | * })
|
104 | * ```
|
105 | *
|
106 | * The stream would behave like the plot below:
|
107 | *
|
108 | * ```text
|
109 | * 100 #
|
110 | * |
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111 | * |
|
112 | * |
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113 | * |
|
114 | * 80 #
|
115 | * |
|
116 | * |
|
117 | * |
|
118 | * | #
|
119 | * 60
|
120 | * |
|
121 | * | #
|
122 | * |
|
123 | * | #
|
124 | * 40
|
125 | * | #
|
126 | * | #
|
127 | * | ##
|
128 | * | ###
|
129 | * 20########
|
130 | * +---------------------> time
|
131 | * ```
|
132 | *
|
133 | * Provide a configuration object with **from**, **to**, **duration**, **ease**,
|
134 | * **interval** (optional), and this factory function will return a stream of
|
135 | * numbers following that pattern. The first number emitted will be `from`, and
|
136 | * the last number will be `to`. The numbers in between follow the easing
|
137 | * function you specify in `ease`, and the stream emission will last in total
|
138 | * `duration` milliseconds.
|
139 | *
|
140 | * The easing functions are attached to `tween` too, such as
|
141 | * `tween.linear.ease`, `tween.power2.easeIn`, `tween.exponential.easeOut`, etc.
|
142 | * Here is a list of all the available easing options:
|
143 | *
|
144 | * - `tween.linear` with ease
|
145 | * - `tween.power2` with easeIn, easeOut, easeInOut
|
146 | * - `tween.power3` with easeIn, easeOut, easeInOut
|
147 | * - `tween.power4` with easeIn, easeOut, easeInOut
|
148 | * - `tween.exponential` with easeIn, easeOut, easeInOut
|
149 | * - `tween.back` with easeIn, easeOut, easeInOut
|
150 | * - `tween.bounce` with easeIn, easeOut, easeInOut
|
151 | * - `tween.circular` with easeIn, easeOut, easeInOut
|
152 | * - `tween.elastic` with easeIn, easeOut, easeInOut
|
153 | * - `tween.sine` with easeIn, easeOut, easeInOut
|
154 | *
|
155 | * @factory true
|
156 | * @param {TweenConfig} config An object with properties `from: number`,
|
157 | * `to: number`, `duration: number`, `ease: function` (optional, defaults to
|
158 | * linear), `interval: number` (optional, defaults to 15).
|
159 | * @return {Stream}
|
160 | */
|
161 | function tween(_a) {
|
162 | var from = _a.from, to = _a.to, duration = _a.duration, _b = _a.ease, ease = _b === void 0 ? tweenFactory.linear.ease : _b, _c = _a.interval, interval = _c === void 0 ? DEFAULT_INTERVAL : _c;
|
163 | var totalTicks = Math.round(duration / interval);
|
164 | return index_1.Stream.periodic(interval)
|
165 | .take(totalTicks)
|
166 | .map(function (tick) { return ease(tick / totalTicks, from, to); })
|
167 | .compose(function (s) { return concat_1.default(s, index_1.Stream.of(to)); });
|
168 | }
|
169 | var tweenFactory = tween;
|
170 | tweenFactory.linear = { ease: interpolate };
|
171 | tweenFactory.power2 = easingPower2;
|
172 | tweenFactory.power3 = easingPower3;
|
173 | tweenFactory.power4 = easingPower4;
|
174 | tweenFactory.exponential = easingExponential;
|
175 | tweenFactory.back = easingBack;
|
176 | tweenFactory.bounce = easingBounce;
|
177 | tweenFactory.circular = easingCirc;
|
178 | tweenFactory.elastic = easingElastic;
|
179 | tweenFactory.sine = easingSine;
|
180 | exports.default = tweenFactory;
|
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y) + to * y);\n}\n\nfunction flip(fn: NumericFunction): NumericFunction {\n  return x => 1 - fn(1 - x);\n}\n\nfunction createEasing(fn: NumericFunction): Easings {\n  let fnFlipped = flip(fn);\n  return {\n    easeIn(x, from, to) {\n      return interpolate(fn(x), from, to);\n    },\n    easeOut(x, from, to) {\n      return interpolate(fnFlipped(x), from, to);\n    },\n    easeInOut(x, from, to) {\n      const y = (x < 0.5) ?\n        (fn(2 * x) * 0.5) :\n        (0.5 + fnFlipped(2 * (x - 0.5)) * 0.5);\n      return interpolate(y, from, to);\n    }\n  };\n}\n\nlet easingPower2 = createEasing(x => x * x);\nlet easingPower3 = createEasing(x => x * x * x);\nlet easingPower4 = createEasing(x => {\n  const xx = x * x;\n  return xx * xx;\n});\n\nconst EXP_WEIGHT = 6;\nconst EXP_MAX = Math.exp(EXP_WEIGHT) - 1;\nfunction expFn(x: number): number {\n  return (Math.exp(x * EXP_WEIGHT) - 1) / EXP_MAX;\n}\nlet easingExponential = createEasing(expFn);\n\nconst OVERSHOOT = 1.70158;\nlet easingBack = createEasing(x => x * x * ((OVERSHOOT + 1) * x - OVERSHOOT));\n\nconst PARAM1 = 7.5625;\nconst PARAM2 = 2.75;\nfunction easeOutFn(x: number): number {\n  let z = x;\n  if (z < 1 / PARAM2) {\n    return (PARAM1 * z * z);\n  } else if (z < 2 / PARAM2) {\n    return (PARAM1 * (z -= 1.5 / PARAM2) * z + 0.75);\n  } else if (z < 2.5 / PARAM2) {\n    return (PARAM1 * (z -= 2.25 / PARAM2) * z + 0.9375);\n  } else {\n    return (PARAM1 * (z -= 2.625 / PARAM2) * z + 0.984375);\n  }\n}\nlet easingBounce = createEasing(x => 1 - easeOutFn(1 - x));\n\nlet easingCirc = createEasing(x => -(Math.sqrt(1 - x * x) - 1));\n\nconst PERIOD = 0.3;\nconst OVERSHOOT_ELASTIC = PERIOD / 4;\nconst AMPLITUDE = 1;\nfunction elasticIn(x: number): number {\n  let z = x;\n  if (z <= 0) {\n    return 0;\n  } else if (z >= 1) {\n    return 1;\n  } else {\n    z -= 1;\n    return -(AMPLITUDE * Math.pow(2, 10 * z))\n      * Math.sin((z - OVERSHOOT_ELASTIC) * (2 * Math.PI) / PERIOD);\n  }\n}\nlet easingElastic = createEasing(elasticIn);\n\nconst HALF_PI = Math.PI * 0.5;\nlet easingSine = createEasing(x => 1 - Math.cos(x * HALF_PI));\n\nconst DEFAULT_INTERVAL: number = 15;\n\nexport interface TweenFactory {\n  (config: TweenConfig): Stream<number>;\n  linear: { ease: Ease };\n  power2: Easings;\n  power3: Easings;\n  power4: Easings;\n  exponential: Easings;\n  back: Easings;\n  bounce: Easings;\n  circular: Easings;\n  elastic: Easings;\n  sine: Easings;\n}\n\n/**\n * Creates a stream of numbers emitted in a quick burst, following a numeric\n * function like sine or elastic or quadratic. tween() is meant for creating\n * streams for animations.\n *\n * Example:\n *\n * ```js\n * import tween from 'xstream/extra/tween'\n *\n * const stream = tween({\n *   from: 20,\n *   to: 100,\n *   ease: tween.exponential.easeIn,\n *   duration: 1000, // milliseconds\n * })\n *\n * stream.addListener({\n *   next: (x) => console.log(x),\n *   error: (err) => console.error(err),\n *   complete: () => console.log('concat completed'),\n * })\n * ```\n *\n * The stream would behave like the plot below:\n *\n * ```text\n * 100                  #\n * |\n * |\n * |\n * |\n * 80                  #\n * |\n * |\n * |\n * |                  #\n * 60\n * |\n * |                 #\n * |\n * |                #\n * 40\n * |               #\n * |              #\n * |            ##\n * |         ###\n * 20########\n * +---------------------> time\n * ```\n *\n * Provide a configuration object with **from**, **to**, **duration**, **ease**,\n * **interval** (optional), and this factory function will return a stream of\n * numbers following that pattern. The first number emitted will be `from`, and\n * the last number will be `to`. The numbers in between follow the easing\n * function you specify in `ease`, and the stream emission will last in total\n * `duration` milliseconds.\n *\n * The easing functions are attached to `tween` too, such as\n * `tween.linear.ease`, `tween.power2.easeIn`, `tween.exponential.easeOut`, etc.\n * Here is a list of all the available easing options:\n *\n * - `tween.linear` with ease\n * - `tween.power2` with easeIn, easeOut, easeInOut\n * - `tween.power3` with easeIn, easeOut, easeInOut\n * - `tween.power4` with easeIn, easeOut, easeInOut\n * - `tween.exponential` with easeIn, easeOut, easeInOut\n * - `tween.back` with easeIn, easeOut, easeInOut\n * - `tween.bounce` with easeIn, easeOut, easeInOut\n * - `tween.circular` with easeIn, easeOut, easeInOut\n * - `tween.elastic` with easeIn, easeOut, easeInOut\n * - `tween.sine` with easeIn, easeOut, easeInOut\n *\n * @factory true\n * @param {TweenConfig} config An object with properties `from: number`,\n * `to: number`, `duration: number`, `ease: function` (optional, defaults to\n * linear), `interval: number` (optional, defaults to 15).\n * @return {Stream}\n */\nfunction tween({\n  from,\n  to,\n  duration,\n  ease = tweenFactory.linear.ease,\n  interval = DEFAULT_INTERVAL\n}: TweenConfig): Stream<number> {\n  const totalTicks = Math.round(duration / interval);\n  return Stream.periodic(interval)\n    .take(totalTicks)\n    .map(tick => ease(tick / totalTicks, from, to))\n    .compose(s => concat<number>(s, Stream.of(to)));\n}\n\nconst tweenFactory: TweenFactory = <TweenFactory> tween;\n\ntweenFactory.linear = { ease: interpolate };\ntweenFactory.power2 = easingPower2;\ntweenFactory.power3 = easingPower3;\ntweenFactory.power4 = easingPower4;\ntweenFactory.exponential = easingExponential;\ntweenFactory.back = easingBack;\ntweenFactory.bounce = easingBounce;\ntweenFactory.circular = easingCirc;\ntweenFactory.elastic = easingElastic;\ntweenFactory.sine = easingSine;\n\nexport default tweenFactory;\n"]} |
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