bubbles

ArrayList thingies = new ArrayList();
float limit, r, org_x, org_y;
color bg = #2E2633;
color s = #DCE9BE;

void setup() {

  size(500, 300);
  background(bg);

  org_x = width/4;
  org_y = height/2;
}

void draw() {

  background(bg);
  if (org_x < width *.75) {
    if (frameCount % 4 == 0) {
      Thingie thingie = new Thingie(org_x);
      thingies.add(thingie);
      org_x += random(8, 12);
    }
  }

  for (int i=0; i<thingies.size();i++) {
    Thingie thing = (Thingie) thingies.get(i);
    thing.run();
  }
}

void mouseClicked() {
  thingies.clear();
  org_x = width/4;
}
class Thingie {
  float theta, t, x, y, sz;
  float alpha = 255;

  Thingie(float _x) {
    x= _x;
    y= height/2 + random(-10, 10);
    sz = int(random(30, 50));
  }

  void run() {
    display();
  }

  void display() {

    fill(s,alpha);
    stroke(s, alpha);
    ellipse(x, y, sz, sz);
    sz -= .35;
    if (sz < 0) alpha = 0;
  }
}