let rng = [];

  if (stop===undefined) [start, stop] = [0, start];

  for (let i=start; step>0 ? i<stop : i>stop; i+=step) rng.push(i);

  return rng;

}

​

function mapColors(value, min, max, ...colors){

  let palette = colors.map(c => c.toString())

  let gradient = chroma.scale(palette).mode('lab')

  let mixture = map(value, min, max, 0, 1)

  return gradient(mixture).hex()

}

​

function polar(cx, cy, angle, dist){

  return {x:cx+cos(angle) * dist, y:cy+sin(angle) * dist}

}

​

function setup() {

  createCanvas(400, 400);

  angleMode(DEGREES)

  background(0);

  noStroke();

  let density = 1000

  let radius = 100

  translate(200, 200)

  for (const i of range(density)){

    let c = mapColors(i, 0, density-1, '#333', '#fff')

    let angle = map(i, 0, density-1, 0, 360)

    let point = polar(0, 0, angle, radius)

    stroke(c)

    line(0, 0, point.x, point.y)

  }

}

​