constructor() {

    this.x = 300;

    this.y = 200;

    this.xspeed = 4;

    this.yspeed = 5;

  }

  display() {

    stroke(255);

  strokeWeight(4);

  fill(200, 0, 200);

  ellipse(this.x, this.y, 24, 24);

}

  bounce() {

​

  if (this.x > width || this.x < 0) {

    this.xspeed = this.xspeed * -1;

  }

​

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

     this.yspeed = this.yspeed * -1;

  }

  } 

move() {

  this.x = this.x + this.xspeed;

  this.y = this.y + this.yspeed;

}

}