​

function setup() {

  createCanvas(400, 400);

  for (let b = 0; b < 2; b++){

    balls.push(new Ball(random(width), random(height),random(2,-2),random(-1,1)));

  }

}

​

function draw() {

  background(220);

  for (let ball of balls) {

    ball.move ();

    ball.bounce ();

    ball.display ();

  }

}

//Define a class called Ball

class Ball {

  constructor(x,y,xspeed,yspeed){

    this.x = x;

    this. y = y;

    this. xspeed = xspeed;

    this. yspeed = yspeed; 

  }

  move(){

   this. x +=this.xspeed;

    this.y +=this.yspeed;

  }

  bounce(){

    if(this.x<0|| this.x>width){

      this.xspeed *=-1;

    }

    if (this.y<0 || this.y>height){

      this.yspeed *= -1

    }

  }

  display(){

    ellipse(this.x,this.y,50,50)

  }

}