class LineCloud
{
  LinkedList elements;
  int capacity;
  
  LineCloud( int capacity )
  {
    this.capacity = capacity;
    elements = new LinkedList();
  }
  
  void Update( int delta )
  {
    Iterator it = elements.iterator();
    while( it.hasNext() )
    {
      DrawLine ln = (DrawLine)it.next();
      if( ln.IsDead() )
      {
        it.remove();
      }
    }
  }
  
  void Add( DrawLine ln )
  {
    while ( elements.size() >= capacity )
    {
      elements.poll();
    }
    
    elements.add( ln );
  }
  
  void AddToShape()
  {
    Iterator it = elements.iterator();
    while( it.hasNext() )
    {
      DrawLine ln = (DrawLine)it.next();
      ln.AddToShape();
    }
  }
}