​

function setup() {

  velocity = createVector(5,0);

  position = createVector(200,50);

  createCanvas(400, 400);

}

​

function draw() {

  background(220);

  velocity.y += 1;

  position.add(velocity);

  if (position.y > 360) {

    velocity.y = velocity.y * -1;

  }

  if (position.x < 40 || position.x > 360) {

    velocity.x = velocity.x * -1; 

  }

​

  ellipse(position.x, position.y, 80,80);

}