%% 
%%  Ein Beispiel der DANTE-Edition
%% 
%% 
%%  Copyright (C) 2010 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[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{190.324pt}
\setlength\parindent{0pt}
\StartShownPreambleCommands
\usepackage{pst-node}\SpecialCoor
\StopShownPreambleCommands
\begin{document}
\begin{pspicture}(3,-3)
  \newcommand{\richtig}{%
    \pnode(0,0){A} \pnode(2,0){B} %
    \psline[linestyle=dashed](A)(B)}
  \pcline[linewidth=2pt](0,0)(3,-3)
  \naput{\richtig}\nbput{richtig} % richtig
  \renewcommand{\richtig}{%
    \pnode(0,0){A} \pnode(2,0){B}%
    \ncline[linestyle=dashed]{A}{B}}\hfill
  \pcline[linewidth=2pt](0,0)(3,-3)
  \naput{\richtig}\nbput{falsch} % falsch
\end{pspicture}
\end{document}