/*
declare variables
 initialize variables
 methods
 */

class Bubble {
  //declare variables
  float x;
  float y;
  float diameter;

  Bubble() {
    //initialize variables
    diameter = random(-100, 50);
    x = width/2 + random(-200, 200);
    y = height-diameter/2;
  }
  //methods
  void display() {
    //background(255);
    ellipse(x, y, diameter, diameter);
  }

  void ascend() {
    y--;
  }

  void top() {
    if (y<(diameter/2))
      y=diameter/2;
  }
}

//you can create a new tab at the top of processing
//thats where this code goes
Bubble b1, b2;

void setup() {
  size(640, 360);
  b1 = new Bubble();
  b2 = new Bubble();

}

void draw() {
  background(255);
  b1.display();
  b1.ascend();
  b1.top();

  b2.display();
  b2.ascend();
  b2.top();
}