%% 
%%  PSTricks -- Grafik fuer TeX und LaTeX, 4. Auflage (1. Auflage 2004)
%% 
%%  Example 11-3-28 on page 125.
%% 
%%  Copyright (C) 2007 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 

\documentclass{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{129.7051pt}
\setlength\parindent{0pt}
\StartShownPreambleCommands
\usepackage{pstricks}
\StopShownPreambleCommands
\begin{document}
\begin{pspicture}[showgrid=true](3,3)
  \pscustom{%
    \code{newpath}
    \dim{0cm}\dim{-2cm} \dim{2cm}\dim{0cm}
    \dim{0cm}\dim{2cm}  \dim{0.5cm}\dim{0.5cm}
    \code{
      moveto rlineto rlineto rlineto closepath
      2 setlinejoin 7.5 setlinewidth
      stroke}}
\end{pspicture}
\end{document}