scale map zmap lmap lerp clamp invlerp range

scale map zmap lmap lerp clamp invlerp range

const scale = (num, in_min, in_max, out_min, out_max) => {
  return (num - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}

const lerp = (x, y, a) => x * (1 - a) + y * a;
const clamp = (a, min = 0, max = 1) => Math.min(max, Math.max(min, a));
const invlerp = (x, y, a) => clamp((a - x) / (y - x));
const range = (x1, y1, x2, y2, a) => lerp(x2, y2, invlerp(x1, y1, a));


https://www.trysmudford.com/blog/linear-interpolation-functions/