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%%
%% A DANTE-Edition example
%%
%% Example 36-00-90 on page 805.
%%
%% 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{201.70511pt}
\usepackage{pstricks}
\parindent=0pt
\makeatletter
\def\@nameedef#1{\expandafter\edef\csname#1\endcsname}
\newrgbcolor{jaunesale}{1.00 0.90 0.50}
\newpsstyle{corde}{doubleline=true,
doublecolor=jaunesale, linewidth=1pt,
doublesep=4pt}
\newpsobject{entier}{psccurve}{style=corde}
\newpsobject{partie}{psecurve}{style=corde}
\newcount\n@eudmax
\def\noeud{%
\count@=0
\n@eud
}
\def\n@eud{%
\@ifnextchar+{\n@eudp}{\@ifnextchar({\n@eudm}{\n@@ud}}%
}
\def\n@eudp+(#1){%
\@namedef{noeud\the\count@}{(#1)}%
\@namedef{pos\the\count@}{+}%
\advance\count@\@ne
\n@eud
}
\def\n@eudm(#1){%
\@namedef{noeud\the\count@}{(#1)}%
\@namedef{pos\the\count@}{-}%
\advance\count@\@ne
\n@eud
}
\def\n@@ud{%
\n@eudmax=\count@
\advance\count@-1
\@nameedef{noeud-1}{\csname noeud\the\count@\endcsname}%
\@nameedef{pos-1}{\csname pos\the\count@\endcsname}%
\advance\count@\m@ne
\@nameedef{noeud-2}{\csname noeud\the\count@\endcsname}%
\@nameedef{pos-2}{\csname pos\the\count@\endcsname}%
\advance\count@2
\@nameedef{noeud\the\count@}{\csname noeud0\endcsname}%
\@nameedef{pos\the\count@}{\csname pos0\endcsname}%
\advance\count@\@ne
\@nameedef{noeud\the\count@}{\csname noeud1\endcsname}%
\@nameedef{pos\the\count@}{\csname pos1\endcsname}%
\count@=0
\def\chemin{}%
\loop
\edef\chemin{\chemin\csname noeud\the\count@\endcsname}%
\advance\count@\@ne
\ifnum\count@<\n@eudmax
\repeat
\expandafter\entier\chemin
\count@=0
\loop
\if\@nameuse{pos\the\count@}+\relax
\advance\count@-2
\edef\chemin{\csname noeud\the\count@\endcsname}%
\advance\count@\@ne
\edef\chemin{\chemin\csname noeud\the\count@\endcsname}%
\advance\count@\@ne
\edef\chemin{\chemin\csname noeud\the\count@\endcsname}%
\advance\count@\@ne
\edef\chemin{\chemin\csname noeud\the\count@\endcsname}%
\advance\count@\@ne
\edef\chemin{\chemin\csname noeud\the\count@\endcsname}%
\advance\count@-2
\expandafter\partie\chemin
\fi
\advance\count@\@ne
\ifnum\count@<\n@eudmax
\repeat
}
\makeatother
\begin{document}
\begin{pspicture}(0,0)(7,5)
\noeud(0,2)(1,0)+(3,1)(3.1,1.4)(3.2,1.8)(3,3)(3,4)(4,5)+(5,4)(4,2)
+(3.2,1.8)(2,2)(1,1)(3,1)(4,1)(5,0)(6,0)(7,2)(6,4)(5,4)(4,3)
+(3,4)(2,4)(1,3)
\end{pspicture}
\end{document}
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