@tldraw/utils
Version:
tldraw infinite canvas SDK (private utilities).
39 lines (38 loc) • 853 B
JavaScript
function lerp(a, b, t) {
return a + (b - a) * t;
}
function invLerp(a, b, t) {
return (t - a) / (b - a);
}
function rng(seed = "") {
let x = 0;
let y = 0;
let z = 0;
let w = 0;
function next() {
const t = x ^ x << 11;
x = y;
y = z;
z = w;
w ^= (w >>> 19 ^ t ^ t >>> 8) >>> 0;
return w / 4294967296 * 2;
}
for (let k = 0; k < seed.length + 64; k++) {
x ^= seed.charCodeAt(k) | 0;
next();
}
return next;
}
function modulate(value, rangeA, rangeB, clamp = false) {
const [fromLow, fromHigh] = rangeA;
const [v0, v1] = rangeB;
const result = v0 + (value - fromLow) / (fromHigh - fromLow) * (v1 - v0);
return clamp ? v0 < v1 ? Math.max(Math.min(result, v1), v0) : Math.max(Math.min(result, v0), v1) : result;
}
export {
invLerp,
lerp,
modulate,
rng
};
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