%% 
%%  A DANTE-Edition example
%% 
%%  Example 16-04-20 on page 249.
%% 
%%  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{177.70511pt}
\setlength\parindent{0pt}

\usepackage{pstricks,pst-node}

\begin{document}
\rnode[lB]{A}{\psframebox{\Huge loooop}}
\ncloop[angleB=180,loopsize=1,arm=.5,
  linearc=.2]{->}{A}{A}
\ncput[npos=3.5,nrot=:U]{\psline{|<->|}%
  (0.5,-0.2)(-0.5,-0.2)}
\nbput[npos=3.5,nrot=:D,labelsep=.35cm]{%
  {\small\texttt{loopsize}}}
\end{document}