createCanvas(windowWidth, windowHeight);

  noLoop();

}

​

function draw() {

  background(220);

  translate(width / 2, height / 2);

​

  noFill();

  strokeWeight(4);

​

  let maxRadius = min(width / 2, height / 2);

​

  beginShape();

  for (let a = 0; a < 360; a += 1) {

    let r = map(a, 0, 360, 1, 1.4 * maxRadius);

    let x = r * cos(radians(8 * a));

    let y = r * sin(radians(8 * a));

    vertex(x, y);

  }

  endShape();

}

​