let bubble2;

let bubble3;

​

function setup() {

  createCanvas(600, 400);

  bubble1 = new Bubble();

  bubble2 = new Bubble();

  bubble3 = new Bubble();

​

}

​

function draw() {

  background(51);

  bubble1.show();

  bubble1.move();

  bubble2.show();

  bubble2.move();

  bubble3.show();

  bubble3.move();

}

​

class Bubble {

​

  constructor() {

    this.x = 200;

    this.y = 150;

  }

​

  move() {

    this.x = this.x + random(-5, 5);

    this.y = this.y + random(-5, 5);

​

  }

  show() {

    stroke(255);

    strokeWeight(4);

    noFill();

    ellipse(this.x, this.y, 25, 25);

  }

}