%% 
%%  A DANTE-Edition example
%% 
%%  Example 14-03-1 on page 159.
%% 
%%  Copyright (C) 2011 Herbert Voss
%% 
%%  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.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{375.57637pt}
\setlength\parindent{0pt}

\usepackage{pstricks,pst-xkey}\makeatletter
\define@boolkey[psset]{}[Pst@]{HRInner}[true]{}   % a boolean key
\psset{HRInner=false,unit=0.7}% unit only reduced for display in this book
\def\psHexagon{\pst@object{psHexagon}}%    defined it as an object
\def\psHexagon@i{\@ifnextchar({\psHexagon@ii}{\psHexagon@ii(0,0)}}% set default centre
\def\psHexagon@ii(#1)#2{%
  \begin@ClosedObj%                        closed object, i.e. can be filled
    \pst@@getcoor{#1}%                     get centre
    \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
        \ifPst@HRInner\space 3 sqrt 2 div div \fi def % adjust radius if inner
      /angle \ifPst@HRInner 30 \else 0 \fi def % starting angle
      Radius angle PtoC moveto %           go to the first point
      6 {/angle angle 60 add def %         set alpha to alpha+60
         Radius angle PtoC L %             draw line to the next point
      } repeat %                           repeat
      closepath }%                         object closed / end pscode
    \def\pst@linetype{3}%                  set line type
    \showpointsfalse%                      do not show support points
  \end@ClosedObj\ignorespaces}%            eat spaces
\makeatother

\begin{document}
\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}\hspace{1cm}
\begin{pspicture}[showgrid](-3,-3)(3,3)
 \psHexagon[doubleline=true](2,2){1}\psHexagon*[linecolor=gray!15,
   HRInner=true](2,-2){1}
 \psHexagon[doubleline=true,doublesep=0.5,linecolor=magenta]{2}
 \psHexagon*(-2.5,2.5){0.5}\psHexagon[border=3pt,HRInner=true](-1,-1){2}
\end{pspicture}
\end{document}
