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+%%
+%% The LaTeX Graphics Companion, 2ed (first printing May 2007)
+%%
+%% Example 0-0-4 on page xxxiii.
+%%
+%% Copyright (C) 2007 Michel Goossens, Frank Mittelbach, Denis Roegel, Sebastian Rahtz, Herbert Vo\ss
+%%
+%% 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.
+%%
+
+\documentclass{ttctexa}
+\pagestyle{empty}
+\setcounter{page}{6}
+\setlength\textwidth{135.83385pt}
+\usepackage{pstricks,pst-xkey}
+\makeatletter % `@' now normal "letter"
+\newif\ifHRInner
+\def\psset@HRInner#1{\@nameuse{HRInner#1}}
+\psset@HRInner{false}
+%
+\def\psHexagon{\pst@object{psHexagon}}
+\def\psHexagon@i{%
+ \@ifnextchar({\psHexagon@ii}%
+ {\psHexagon@ii(0,0)}% specify center?
+}
+\def\psHexagon@ii(#1)#2{%
+ \begin@ClosedObj% closed object
+ \pst@@getcoor{#1}% get center
+ \pssetlength\pst@dimc{#2}% set radius to pt
+ \addto@pscode{% PostScript
+ \pst@coor T % xM yM new origin
+ \psk@dimen CLW mul % set line width
+ /Radius \pst@number\pst@dimc\space % save radius
+ \ifHRInner\space 3 sqrt 2 div div \fi def % inner?
+ /angle \ifHRInner 30 \else 0 \fi def % starting angle
+ Radius angle PtoC moveto % go to first point
+ 6 { % 6 iterations
+ /angle angle 60 add def % alpha = alpha+60
+ Radius angle PtoC L % line to next point
+ } repeat
+ closepath % closed object
+ }%
+ \def\pst@linetype{3}% set linetype
+ \showpointsfalse% do not show base points
+ \end@ClosedObj% end
+ \ignorespaces% swallow spaces
+}
+\makeatother % `@' is restored as "non-letter"
+\StartShownPreambleCommands
+
+\StopShownPreambleCommands
+\begin{document}
+\psset{unit=7mm}
+\begin{pspicture}(-3,-3)(3,3)
+ \psHexagon[linewidth=3pt,linecolor=red]{2.5}
+ \pscircle[linestyle=dashed,linecolor=red]{2.5}
+%
+ \psHexagon[linewidth=3pt,linecolor=blue,HRInner=true]{2.5}
+ \pscircle[linestyle=dashed,linecolor=blue]{2.17}
+\end{pspicture}
+\end{document}