let ball2;

​

function setup() {

  createCanvas(400, 400);

  ball1=new Ball(50,100,30,30,2.5);

  ball2=new Ball(100,200,30,30,1);

}

​

function draw() {

  background(0);

  ball1.move();

  ball1.show();

  ball2.move();

  ball2.show();

}

​

class Ball{

  constructor(x,y,r,xspeed,yspeed){

    this.x=x;

    this.y=y;

    this.r=r;

    this.xspeed=xspeed;

    this.yspeed=yspeed;

}

    move(){

    this.x += this.xspeed;

    this.y += this.yspeed;

    this.xspeed = this.bounce(this.x, 0, width,this.xspeed);

  this.yspeed = this.bounce(this.y, 0, height, this.yspeed);

  }

    show(){

    stroke(255);

    strokeWeight(4);

    fill("red")

    ellipse(this.x, this.y, this.r);

  }

    bounce(pos, low, high, speed){

  if (pos< low || pos> high){

    return speed*= -1;

  }else return speed;

  }

​

}