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%%
%% 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{pstricks,pst-node,pst-xkey}\SpecialCoor
\makeatletter
\define@boolkey[psset]{}[Pst@]{zeigeSP}[true]{}% Schwerpunkt markieren?
\psset{zeigeSP=true} % Vorgabe
\def\Schwerpunkt{\pst@object{Schwerpunkt}}
\def\Schwerpunkt@i(#1)(#2)(#3)#4{%
\pst@getcoor{#1}\pst@tempA% Punkt A % hole Kordinaten als x y
\pst@getcoor{#2}\pst@tempB% Punkt B % "
\pst@getcoor{#3}\pst@tempC% Punkt C % "
\begin@SpecialObj % Parameter setzen
\pnode(!% % setze Knoten
\pst@tempA /YA exch \pst@number\psyunit div def
/XA exch \pst@number\psxunit div def % x y in user Koordinaten
\pst@tempB /YB exch \pst@number\psyunit div def
/XB exch \pst@number\psxunit div def
\pst@tempC /YC exch \pst@number\psyunit div def
/XC exch \pst@number\psxunit div def
XA XB XC add add 3.0 div % xSP
YA YB YC add add 3.0 div % ySP
){#4} % #5 = Knotenname
\ifPst@zeigeSP\qdisk(#4){2pt}\fi% markieren?
\end@SpecialObj%
\ignorespaces}
\makeatother
\StopShownPreambleCommands
\begin{document}
\begin{pspicture}[showgrid](4,4) \psset{linewidth=2pt}
\pspolygon[linecolor=red](0,0)(2,4)(4,0)%
\Schwerpunkt[zeigeSP,linecolor=red](0,0)(2,4)(4,0){SP1}%
\pnode(0,0){A}\pnode(0,4){B}\pnode(4,2){C}%
\pspolygon[linecolor=blue](A)(B)(C)%
\Schwerpunkt(A)(B)(C){SP2}%
{\psset{linecolor=blue}\qdisk(SP2){2pt}}
\ncline[linewidth=0.2pt]{<->}{SP1}{SP2}%
\end{pspicture}
\end{document}
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