​

function setup() {

  createCanvas(600, 400);

}

​

function mouseDragged(){

  r = random(20,40);

let b = new Bubble(mouseX, mouseY, r);

  bubbles.push(b);

}

function draw() {

  background(0);

  for (i = 0; i < bubbles.length; i++) {

    bubbles[i].show();

    bubbles[i].move();

    bubbles[i].back();

  }

}