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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% bsp105.tex ---
%% Autor : Herbert Voss <voss@perce.de>
%% Datum : 2004-04-25
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\documentclass[12pt]{article}
\usepackage{pstricks}
\usepackage{multido}
\usepackage{pst-node}
\usepackage{pst-key}
\SpecialCoor
\makeatletter
\newif\ifPST@zeigeSP % Schwerpunkt markieren?
\define@key{psset}{zeigeSP}[true]{% zeigeSP" entspricht true
\@nameuse{PST@zeigeSP#1}% benutze \ifPST@zeigeSP
}
\psset{zeigeSP=true} % Vorgabe
%
\def\Schwerpunkt{\@ifnextchar[{\Schwerpunkt@i}{\Schwerpunkt@i[]}}
\def\Schwerpunkt@i[#1](#2)(#3)(#4)#5{{ % {{ damit alles lokal bleibt
\setkeys{psset}{#1} % Parameter setzen
\pst@getcoor{#2}\pst@tempa% Punkt A % hole Kordinaten als x y
\pst@getcoor{#3}\pst@tempb% Punkt B % "
\pst@getcoor{#4}\pst@tempc% Punkt C % "
\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
){#5} % #5 = Knotenname
\ifPST@zeigeSP % markieren?
\qdisk(#5){2pt}
\fi
}}
\makeatother
\pagestyle{empty}
\begin{document}
\begin{pspicture}(-5,-5)(5,5)
\multido{\rA=-5+0.5,\rB=0+0.5,\rC=5+-0.5}{10}{%
\pnode(-5,\rA){A}\pnode(\rB,5){B}\pnode(\rC,-5){C}%
\pspolygon[linecolor=blue](A)(B)(C)%
\Schwerpunkt(A)(B)(C){SP}%
}
\multido{\rA=0+0.5,\rB=5+-0.5,\rC=0+-0.5}{10}{%
\pnode(-5,\rA){A}\pnode(5,\rB){B}\pnode(\rC,-5){C}%
\pspolygon[linecolor=red](A)(B)(C)%
\Schwerpunkt(A)(B)(C){SP}%
}
\multido{\rA=-5+0.5,\rB=0+-0.5,\rC=-5+0.5}{10}{%
\pnode(\rA,5){A}\pnode(5,\rB){B}\pnode(-5,\rC){C}%
\pspolygon[linecolor=cyan](A)(B)(C)%
\Schwerpunkt(A)(B)(C){SP}%
}
\multido{\rA=0+0.5,\rB=5+-0.5,\rC=0+0.5}{10}{%
\pnode(\rA,5){A}\pnode(\rB,-5){B}\pnode(-5,\rC){C}%
\pspolygon[linecolor=magenta](A)(B)(C)%
\Schwerpunkt(A)(B)(C){SP}%
}
\multido{\rA=5+-0.5,\rB=0+-0.5,\rC=-5+0.5}{10}{%
\pnode(5,\rA){A}\pnode(\rB,-5){B}\pnode(\rC,5){C}%
\pspolygon[linecolor=blue](A)(B)(C)%
\Schwerpunkt(A)(B)(C){SP}%
}
\multido{\rA=0+-0.5,\rB=-5+0.5,\rC=0+0.5}{10}{%
\pnode(5,\rA){A}\pnode(-5,\rB){B}\pnode(\rC,5){C}%
\pspolygon[linecolor=red](A)(B)(C)%
\Schwerpunkt(A)(B)(C){SP}%
}
\multido{\rA=5+-0.5,\rB=0+0.5,\rC=5+-0.5}{10}{%
\pnode(\rA,-5){A}\pnode(-5,\rB){B}\pnode(5,\rC){C}%
\pspolygon[linecolor=cyan](A)(B)(C)%
\Schwerpunkt(A)(B)(C){SP}%
}
\multido{\rA=0+-0.5,\rB=-5+0.5,\rC=0+-0.5}{10}{%
\pnode(\rA,-5){A}\pnode(\rB,5){B}\pnode(5,\rC){C}%
\pspolygon[linecolor=magenta](A)(B)(C)%
\Schwerpunkt(A)(B)(C){SP}%
}
\end{pspicture}
\end{document}
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