%% 
%%  A DANTE-Edition example
%% 
%%  Example 11-03-28 on page 135.
%% 
%%  Copyright (C) 2011 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.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{201.70511pt}
\setlength\parindent{0pt}

\usepackage{pstricks}

\begin{document}
\begin{pspicture}[showgrid](3,3)
 \pscustom{%
   \code{%
     newpath
     20 20 moveto 0 50 rlineto
     50 0 rlineto 0 -50 rlineto
    -50 0 rlineto closepath
     2 setlinejoin 7.5 setlinewidth stroke}}
\end{pspicture}
\end{document}