%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 5-6-1 on page 231.
%% 
%%  Copyright (C) 2007 Michel Goossens, Frank Mittelbach, Denis Roegel, Sebastian Rahtz, Herbert Vo\ss 
%% 
%%  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{183.83385pt}
\StartShownPreambleCommands
\usepackage{pstricks}
\StopShownPreambleCommands
\begin{document}
\begin{pspicture}[showgrid=true](2,2)
  \psline*[linecolor=red]{->}(1,2)
  \psline[linecolor=blue]{<-}(2,1)
\end{pspicture}\hspace{2em}
\begin{pspicture}[showgrid=true](2,2)
  \psline*[linecolor=red](0,1)(1,2)(1,1)
  \psline[linecolor=blue](1,0)(1,1)(2,1)(1,0)
\end{pspicture}
\end{document}