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2021-04-02 02:24:13 +03:00

72 lines
1.9 KiB
JavaScript

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