class Ring
{
  float ringRed;
  float ringGreen;
  float ringBlue;
  int size;
  
  Ring(float ringRed, float ringGreen, float ringBlue)
  {
    this.ringRed = ringRed;
    this.ringGreen = ringGreen;
    this.ringBlue = ringBlue;
    
    size = 4;
  }
  
  void draw()
  {
    stroke(color(ringRed, ringGreen, ringBlue, 400 - size));
    strokeWeight(4);
    noFill();
    
    ellipse(159, 119, size(), size());
  }
  
  int size()
  {
    return size;
  }
  
  void step()
  {
    size += 4;
  }
}

void setup()
{
  size(320, 240);
  smooth();
  framerate(12);

  rings = new ArrayList();
  t = 1;
}

ArrayList rings;
int t;

void draw()
{
  background(255);
  
  stroke(192);
  strokeWeight(1);
  noFill();
  
  line(159, 0, 159, 240);
  line(0, 119, 320, 119);
  
  ellipse(159, 119, 100, 100);
  ellipse(159, 119, 200, 200);
  ellipse(159, 119, 300, 300);
  
  float n = noise(t);
  if (t / 4 * 4 == t && n > 0.63)
  {
    rings.add(new Ring(192, 192, 255));
  }
  
  for (int i = rings.size() - 1; i >= 0; i--)
  {
    Ring each = (Ring)rings.get(i);
    
    if (each.size() > 400)
      rings.remove(each);
  }
  
  for (int i = 0; i < rings.size(); i++)
  {
    Ring each = (Ring)rings.get(i);
    
    each.draw();
  }
  
  for (int i = 0; i < rings.size(); i++)
  {
    Ring each = (Ring)rings.get(i);
    
    each.step();
  }
  
  t++;
}