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%%
%% The LaTeX Graphics Companion, 2ed (first printing May 2007)
%%
%% Example 6-2-5 on page 337.
%%
%% 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{135.83385pt}
\StartShownPreambleCommands
\usepackage{pstricks,pst-node}
\SpecialCoor
\makeatletter
\def\nodeBetween(#1)(#2)#3{%
\pst@getcoor{#1}\pst@tempA \pst@getcoor{#2}\pst@tempB
\pnode(!%
\pst@tempA /YA exch \pst@number\psyunit div def
/XA exch \pst@number\psxunit div def
\pst@tempB /YB exch \pst@number\psyunit div def
/XB exch \pst@number\psxunit div def
XB XA add 2 div YB YA add 2 div){#3}}
\makeatletter
\StopShownPreambleCommands
\begin{document}
\begin{pspicture}[showgrid=true](-0.3,-0.45)(3,2)
\psline[linestyle=dashed]{o-o}(0.25,0.33)(2.333,2)
\nodeBetween(0.25,0.33)(2.333,2){center}
\pscircle[linecolor=blue](center){3pt}
\end{pspicture}
\bigskip A node \rnode{B}{demonstration}.
\nccurve[arrows=->,linecolor=blue,nodesep=5pt]{B}{center}
\end{document}
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