src/js/math.js

export const TWO_PI = Math.PI * 2;
export const HALF_PI = Math.PI / 2;
export const DEG_TO_RAD = Math.PI / 180;
export const RAD_TO_DEG = 180 / Math.PI;

export function lerp(start, end, factor) {
    return start + (end - start) * factor;
}

export function normalizeAngle(angle) {
    return angle % TWO_PI;
}

export function clamp(value, min, max) {
    return Math.max(min, Math.min(max, value));
}

export function smoothStep(value, edge0, edge1) {
    const t = clamp((value - edge0) / (edge1 - edge0), 0, 1);
    return t * t * (3 - 2 * t);
}

export function distance(x1, y1, x2, y2) {
    const dx = x2 - x1;
    const dy = y2 - y1;
    return Math.sqrt(dx * dx + dy * dy);
}

export function map(value, inMin, inMax, outMin, outMax) {
    return (value - inMin) * (outMax - outMin) / (inMax - inMin) + outMin;
}