# The Szekeres snark, more new features

March 9, 2011

`\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} \pgfmathsetmacro{\rad}{72*\x} \grEmptyCycle[RA=1.65,r=4,d=\rad,prefix=\alph{in},rotation=\rad-160]{9} \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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2 Comments
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Very fine Blog

Altermundus !

Thanks Alain! I saw that your packages are in CTAN already, which is just great!