%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 6-2-24 on page 345.
%% 
%%  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}
\StartShownPreambleCommands
\usepackage{pstricks,pst-node}
\StopShownPreambleCommands
\begin{document}
\hspace*{0.5cm}\rnode[lB]{A}{\psframebox{\Huge loooop}}
\ncloop[angleB=180,loopsize=1,arm=.5,linearc=.2]{->}{A}{A}
\psset{npos=3.5}
\ncput[nrot=:U]{\psline{|<->|}(0.5,-0.2)(-0.5,-0.2)}
\nbput[nrot=:D,labelsep=.35cm]{{\small\texttt{loopsize}}}
\end{document}