tags: ,

\grEmptyCycle and \grCycle can also have options x and y, that set the coordinates of the center of the cycle, or r and d for polar coordinates (r is the radius and d the angle). Here we use these options together with rotation, in order to draw the Szekeres snark.

\newcounter{in}
\newcounter{nex}
\newcounter{ney}
\begin{tikzpicture}[rotate=90,scale=0.8]
\SetUpVertex[Style={font=\footnotesize\sffamily}]
\SetVertexNormal[MinSize=12pt,InnerSep=0pt]
\grEmptyCycle[prefix=x]{5}
\foreach \x in  {0,1,...,4}{%
\setcounter{in}{\x}
\stepcounter{in}
\EdgeInGraphLoop*{\alph{in}}{9}
\Edge(\alph{in}0)(\alph{in}5)
\Edge(\alph{in}8)(\alph{in}3)
\foreach \y in {1,4,7}{%
\Edge(x\x)(\alph{in}\y)}
}
\foreach  \x in  {0,1,...,4}{%
\setcounter{in}{\x}
\stepcounter{in}
\pgfmathsetcounter{nex}{mod(\x+1,5)+1}
\setcounter{ney}{\thenex}
\Edge(\alph{in}0)(\alph{ney}8)
\pgfmathsetcounter{nex}{mod(\x+2,5)+1}
\setcounter{ney}{\thenex}
\Edge(\alph{in}6)(\alph{ney}2)
}
\end{tikzpicture}
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