%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  7. Auflage
%% 
%%  Beispiel 15-03-5 auf Seite 265.
%% 
%%  Copyright (C) 2016 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{97.16928pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage{pst-node}
\makeatletter \def\nodeBetween(#1)(#2)#3{%
 \pst@getcoor{#1}\pst@tempa  \pst@getcoor{#2}\pst@tempb
 \pnode(! \pst@tempa \tx@UserCoor /YA ED /XA ED
          \pst@tempb \tx@UserCoor /YB ED /XB ED
    XB XA add 2 div YB YA add 2 div){#3}}\makeatother
%StopShownPreambleCommands
\begin{document}
\begin{pspicture}[showgrid](3,2)
\psline[linestyle=dashed]{o-o}(0.25,0.33)(2.333,2)
\nodeBetween(0.25,0.33)(2.333,2){Mitte}\pscircle*(Mitte){3pt}
\end{pspicture}
\end{document}