let ball;

function setup()
{
  createCanvas(900, 600);
  ball = new Ball();
}

function draw()
{
  background(0);
  ball.run();
}

class Ball
{
  constructor()
  {
    this.velocity = new createVector(0, 0);
    this.location = new createVector(0, height/2);
    this.acceleration = new createVector(0.03, 0);
    this.maxVelocity = 10;
  }

  run()
  {
    this.draw();
    this.move();
    this.edges();
  }

  draw()
  {
    fill(125);
    ellipse(this.location.x, this.location.y, 40, 40);
  }

  move()
  {
    this.velocity.add(this.acceleration);
    this.velocity.limit(this.maxVelocity);
    this.location.add(this.velocity);
  }

  edges()
  {
    if (this.location.x < 0) this.location.x = width;
    else if (this.location.x > width) this.location.x = 0;
    else if (this.location.y < 0) this.location.y = height;
    else if (this.location.y > height) this.location.y = 0;
  }
}
