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\newpage\section{Pappus}
%<––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––>
%<––––––––––––––––––––––––––––– Pappus ––––––––––––––––––––––––––––––––>
%<––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––>
\begin{NewMacroBox}{grPappus}{\oarg{options}}
\medskip
From MathWord : \url{http://mathworld.wolfram.com/PappusGraph.html}
\emph{A cubic symmetric distance-regular graph on 18 vertices, illustrated below in three embeddings. It can be represented in LCF notation $[5,7,-7,7,-7,-5]^3$ (Frucht 1976).}
\href{http://mathworld.wolfram.com/topics/GraphTheory.html}%
{\textcolor{blue}{MathWorld}} by \href{http://en.wikipedia.org/wiki/Eric_W._Weisstein}%
{\textcolor{blue}{E.Weisstein}}
From Wikipedia : \url{http://en.wikipedia.org/wiki/Pappus_graph}
\emph{In the mathematical field of graph theory, the Pappus graph is a 3-regular graph with 18 vertices and 27 edges, formed as the Levi graph of the Pappus configuration. It is a distance-regular graph, one of only 14 such cubic graphs according to Cubic symmetric graphs.}
This macro can be used with three different forms.
\end{NewMacroBox}
\bigskip
\subsection{\tkzname{Pappus Graph : form 1}}
\begin{center}
\begin{tkzexample}[vbox]
\begin{tikzpicture}[scale=.7]
\GraphInit[vstyle=Art]
\grPappus[RA=7]
\end{tikzpicture}
\end{tkzexample}
\end{center}
\vfill\newpage
\subsection{\tkzname{Pappus Graph : form 2}}
\begin{center}
\begin{tkzexample}[vbox]
\begin{tikzpicture}
\GraphInit[vstyle=Art]
\SetGraphArtColor{red}{olive}
\grPappus[form=2,RA=7,RB=5,RC=3]
\end{tikzpicture}
\end{tkzexample}
\end{center}
\vfill\newpage
\subsection{\tkzname{Pappus Graph : form 3}}
\begin{center}
\begin{tkzexample}[vbox]
\begin{tikzpicture}
\GraphInit[vstyle=Art]
\SetGraphArtColor{gray}{blue}
\grPappus[form=3,RA=7,RB=5,RC=2.5]
\end{tikzpicture}
\end{tkzexample}
\end{center}
\endinput
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