createCanvas(windowWidth, windowHeight);

}

​

function draw() {

  background(220);

  translate(width / 2, height / 2);

​

  noFill();

  strokeWeight(1);

  stroke(255, 0, 50);

​

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

  let r = maxRadius / 2;

  let alphaVal = floor(frameCount / 8);

​

  beginShape();

  for (let a = 0; a < 360; a += 1) {

    let t = radians(a);

    let k = r * (1 - cos(alphaVal * t));

​

    let x = k * cos(t);

    let y = k * sin(t);

    vertex(x, y);

  }

  endShape(CLOSE);

}

​