let nSlider;

let dSlider;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  angleMode(DEGREES);

  nSlider = createSlider(1,20,2);

  dSlider = createSlider(1,20,5);

}

​

function draw() {

  background(0);

  translate(width / 2, height / 2);

  stroke(225);

  n = nSlider.value();

  d = dSlider.value();

  noFill();

  beginShape();

  for (let i = 0; i < 361 * 20; i++) {

    let k = n/d

    let r = 200 * cos(k * i);

    let x = r * cos(i)

    let y = r * sin(i) 

    vertex(x, y);

  }

  endShape();

}