pink bubbles

ArrayList<Bubble> bubbles = new ArrayList<Bubble>();

int border;

​

void setup() {  //setup function called initially, only once

  size(400,400);

  border = 100;

  frameRate(30);

  for(int i = 0; i < 20; i++){

    bubbles.add(new Bubble());

  }

}

​

void draw() {  //draw function loops 

  background(255,100,100);

  for(int i = 0; i < 2; i++){

    bubbles.add(new Bubble());

  }

  for (int i = (bubbles.size()-1); i >= 0; i--) {

    Bubble b = bubbles.get(i);

    b.update();

    if(b.pos.x > width + border){bubbles.remove(i);}

    if(b.pos.x < 0 - border){bubbles.remove(i);}

    if(b.pos.y > height + border){bubbles.remove(i);}

    if(b.pos.y < 0 - border){bubbles.remove(i);}

  }

}

​

class Bubble{

  PVector pos;

  PVector vel;

  float time; 

  float st;

  float sz = random(5,40);

  Bubble(){

    time = 0;

    st = random(0.1,0.5);

    pos = new PVector(random(width), random(height));

    vel = new PVector(random(-2,2),random(-2,2));

  }

  void update(){

    time += st;

    if (time > 64) time = 64;

    move();

    render();

  }

  void move(){

    pos.add(vel);

  }

  void render(){

    fill(255,time);

    noStroke();

    ellipse(pos.x, pos.y,sz,sz);

  }

}