let x = 0;

let y = 0;

let yoff = 0;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

}

​

function draw() {

  background(0);

  translate(width / 2.0, height / 2.0);

  stroke(255);

  strokeWeight(2);

  // noFill();

  let xoff = 0;

​

  beginShape();

  for (let a = 0; a < TWO_PI; a += 0.1) {

    let offset = map(noise(xoff + yoff), 0, 1, -25, 25);

    let r1 = r + offset;

    x = r1 * cos(a);

    y = r1 * sin(a);

    vertex(x, y);

    xoff += 0.1;

  }

  endShape(CLOSE);

  yoff += 0.01;

}