class Explosion
{
  private ArrayList particles;
  public float fillR, fillG, fillB;
  public Explosion(float x, float y, float R, float G, float B)
  {
    particles = new ArrayList();
    for(int i = 0; i < 50; i++)
    {
      ParticleX p = new ParticleX();
      p.gravity = 0.1;
      p.gravity_direction = 270;
      p.speed = random(6);
      p.direction = random(360);
      p.x = x;
      p.y = y;
      particles.add(p);
      fillR = R;
      fillG = G;
      fillB = B;
    }
  }
  public void step()
  {
    int to = particles.size();
    for(int i = 0; i < to; i++)
    {
      ParticleX p = (ParticleX) particles.get(i);
      p.step();
      p.draw(fillR, fillG, fillB);
      if(p.alive == false)
      {
        particles.remove(i);
        i--;
        to--;
      }
    }
  }
}