createCanvas(400, 400);

}

​

function draw() {

  background(204);

  push();

  translate(width / 2, height / 2);

  let a = atan2(mouseY - height / 2, mouseX - width / 2);

  rotate(a);

  rect(-30, -5, 60, 10);

  pop();

  ellipse(mouseX, mouseY, 10, 10);

}