createCanvas(windowWidth, windowHeight);

}

​

function draw() {

  background(220, 20, 120);

  let amplitude = width / 2;

  let xOffset = width / 4;

​

  let x = (3 * frameCount) % amplitude;

  let y = height / 2;

​

  ellipse(x + xOffset, y, 25);

}

​