47 lines
1.5 KiB
JavaScript
47 lines
1.5 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = void 0;
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var _base = require("../base");
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const VELOCITY_EPS = 5;
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function decay(clock, state, config) {
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const lastTime = (0, _base.cond)(state.time, state.time, clock);
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const deltaTime = (0, _base.sub)(clock, lastTime); // v0 = v / 1000
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// v = v0 * powf(deceleration, dt);
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// v = v * 1000;
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// x0 = x;
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// x = x0 + v0 * deceleration * (1 - powf(deceleration, dt)) / (1 - deceleration)
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const kv = (0, _base.pow)(config.deceleration, deltaTime);
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const kx = (0, _base.divide)((0, _base.multiply)(config.deceleration, (0, _base.sub)(1, kv)), (0, _base.sub)(1, config.deceleration));
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const v0 = (0, _base.divide)(state.velocity, 1000);
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const v = (0, _base.multiply)(v0, kv, 1000);
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const x = (0, _base.add)(state.position, (0, _base.multiply)(v0, kx));
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return (0, _base.block)([(0, _base.set)(state.position, x), (0, _base.set)(state.velocity, v), (0, _base.set)(state.time, clock), (0, _base.cond)((0, _base.lessThan)((0, _base.abs)(v), VELOCITY_EPS), (0, _base.set)(state.finished, 1))]);
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}
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const procDecay = (0, _base.proc)((clock, time, velocity, position, finished, deceleration) => decay(clock, {
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time,
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velocity,
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position,
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finished
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}, {
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deceleration
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}));
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var _default = (clock, {
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time,
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velocity,
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position,
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finished
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}, {
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deceleration
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}) => procDecay(clock, time, velocity, position, finished, deceleration);
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exports.default = _default;
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//# sourceMappingURL=decay.js.map
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