let y;

​

function setup() {

  createCanvas(400, 400);

  x = width / 2;

  y = height / 2;

}

​

function draw() {

  background(220);

  ellipse(x, y, 40, 40);

  if (x < mouseX) x += width / height;

  if (x > mouseX) x -= width / height;

  if (y < mouseY) y += width / height;

  if (y > mouseY) y -= width / height;

}

​