createCanvas(400, 400);

}

​

function draw() {

  background(0);

​

  stroke(255);

  noFill();

​

  for (let x = 0; x <= mouseX; x += 50) {

    ellipse(x, 200, 50);

  }

​

  //ellipse(200, 200, 50);

  //ellipse(250, 200, 50);

}

​