x: 0,

  y: 0,

  xspeed: 4,

  yspeed: 4

}

​

function setup() {

  createCanvas(600, 400);

}

​

function draw() {

  background(0);

  move();

  bounce();

  display();

}

​

​

function move() {

  ball.x = ball.x + ball.xspeed;

  ball.y = ball.y + ball.yspeed;

​

}

​

function bounce() {

  if (ball.x > width || ball.x < 0) {

    ball.xspeed = ball.xspeed * -1;

​

  }

​

  if (ball.y > height || ball.y < 0) {

    ball.yspeed = ball.yspeed * -1;

​

  }

}

​

function display() {

  stroke(255);

  strokeWeight(4);

  noFill();

  ellipse(ball.x, ball.y, 40, 40);

}