72 lines
1.9 KiB
JavaScript
72 lines
1.9 KiB
JavaScript
"use strict";
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function stiffnessFromOrigamiValue(oValue) {
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return (oValue - 30) * 3.62 + 194;
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}
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function dampingFromOrigamiValue(oValue) {
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return (oValue - 8) * 3 + 25;
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}
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function fromOrigamiTensionAndFriction(tension, friction) {
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return {
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stiffness: stiffnessFromOrigamiValue(tension),
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damping: dampingFromOrigamiValue(friction)
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};
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}
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function fromBouncinessAndSpeed(bounciness, speed) {
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function normalize(value, startValue, endValue) {
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return (value - startValue) / (endValue - startValue);
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}
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function projectNormal(n, start, end) {
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return start + n * (end - start);
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}
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function linearInterpolation(t, start, end) {
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return t * end + (1 - t) * start;
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}
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function quadraticOutInterpolation(t, start, end) {
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return linearInterpolation(2 * t - t * t, start, end);
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}
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function b3Friction1(x) {
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return 0.0007 * Math.pow(x, 3) - 0.031 * Math.pow(x, 2) + 0.64 * x + 1.28;
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}
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function b3Friction2(x) {
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return 0.000044 * Math.pow(x, 3) - 0.006 * Math.pow(x, 2) + 0.36 * x + 2;
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}
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function b3Friction3(x) {
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return 0.00000045 * Math.pow(x, 3) - 0.000332 * Math.pow(x, 2) + 0.1078 * x + 5.84;
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}
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function b3Nobounce(tension) {
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if (tension <= 18) {
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return b3Friction1(tension);
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} else if (tension > 18 && tension <= 44) {
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return b3Friction2(tension);
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} else {
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return b3Friction3(tension);
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}
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}
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var b = normalize(bounciness / 1.7, 0, 20);
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b = projectNormal(b, 0, 0.8);
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var s = normalize(speed / 1.7, 0, 20);
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var bouncyTension = projectNormal(s, 0.5, 200);
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var bouncyFriction = quadraticOutInterpolation(b, b3Nobounce(bouncyTension), 0.01);
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return {
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stiffness: stiffnessFromOrigamiValue(bouncyTension),
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damping: dampingFromOrigamiValue(bouncyFriction)
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};
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}
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module.exports = {
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fromOrigamiTensionAndFriction,
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fromBouncinessAndSpeed
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};
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//# sourceMappingURL=SpringConfig.js.map
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