%% 
%%  A DANTE-Edition example
%% 
%%  Example 04-01-4 on page 46.
%% 
%%  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}
\psset{linewidth=3mm,unit=0.8}
\begin{pspicture}[showgrid](3,2)
  \psline(0,0)(1,2)(2,0)(3,2)
\end{pspicture}\\[10pt]
\begin{pspicture}[showgrid](4,2)
  \psline[linejoin=1](0,0)(1,2)(2,0)(3,2)(4,0)%
\end{pspicture}\\[10pt]
\begin{pspicture}[showgrid](3,2)
  \psline[linejoin=2](0,0)(1,2)(2,0)(3,2)%
\end{pspicture}
\end{document}