superellipse / squircle

superellipse

// superellipse / Lamé curve
// https://en.wikipedia.org/wiki/Superellipse

const a = 0.4; // semi-diameter
const b = 0.4; // semi-diameter
const n = 1.5; // curve (<1, 1-2, >2)
const c = Math.cos(gamma); // gamma 0-2π
const s = Math.sin(gamma); // gamma 0-2π
const x = Math.pow(Math.abs(c), 2 / n) * a * Math.sign(c);
const y = Math.pow(Math.abs(s), 2 / n) * b * Math.sign(s);