​

function setup() {

  createCanvas(400, 400);

  fill(255, 174, 0);

  stroke(255, 136, 0);

}

​

var circleX = 100;

var circleY = 100;

var xMove = 2;

var yMove = 3;

​

function draw() {

  background(248, 232, 255);

  ellipse(circleX, circleY, 20, 20);

  if (circleX > 400 || circleX < 0) {

    xMove = xMove * -1;

  }

  circleX = circleX + xMove;

  if (circleY > 400 || circleY < 0) {

    yMove = yMove * -1;

  }

  circleY = circleY + yMove;

}