let vector;

​

class mover {

  constructor() {

    this.position = createVector(1, 1);

    this.vector = createVector(1, 1);

  }

​

  display() {

    ellipse(this.position.x, this.position.y, 10, 10);

  }

  checkEdges() {

    if (this.position.x > width || this.position.x < 0) {

      this.vector.x *= -1;

    }

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

      this.vector.y *= -1;

    }

  }

  update() {

    this.position.add(this.vector);

  }

}

​

function setup() {

  createCanvas(400, 400);

  ball = new mover();

}

​

function draw() {

  background(220);

  ball.checkEdges();

  ball.update();

  ball.display();

}

​