C#

public class GDIBuffer
{
  static Hashtable pens = new Hashtable();
  static Hashtable brushes = new Hashtable();

  public static Brush GetBrush(Color color)
  {
    if (!brushes.Contains(color))
        brushes.Add(color, new SolidBrush(color));
    return brushes[color] as Brush;
  }

  public static Pen GetPen(Color color)
  {
    if (!pens.Contains(color))
      pens.Add(color, new Pen(color));
    return pens[color] as Pen;
  }

  public static Pen GetPen(Brush brush)
  {
    if (!pens.Contains(brush))
      pens.Add( brush, new Pen(brush));
    return pens[brush] as Pen;
  }

  public static Pen GetPen(Brush brush, int width)
  {
    Tuple t = new Tuple();
    t.left = brush;
    t.right = width;

    if (!pens.Contains(t))
      pens.Add( t, new Pen(brush, width));
    return pens[t] as Pen;
  }

  struct Tuple
  {
    public object left;
    public object right;
  }
}