%% The LaTeX Graphics Companion, 2ed (first printing May 2007)

%%
%% The LaTeX Graphics Companion, 2ed (first printing May 2007)
%%
%% Example 6-2-55 on page 357.
%%
%% 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}
\setlength\parindent{0pt}
\StartShownPreambleCommands
\usepackage{pstricks,pst-node}
\StopShownPreambleCommands
\begin{document}
\begin{pspicture}[showgrid=true](3,4)
\cnode(0.1,0.1){0.1cm}{A} \cnode(2.9,2.9){0.1cm}{B}
\ncline{<->}{A}{B} \ncput*{on}
\naput[npos=0.75]{above} \nbput[npos=0.25]{below}
\nccurve[angleA=110,angleB=100,
linecolor=blue]{<->}{A}{B}
\ncput{\textcolor{blue}{on}}
\naput[npos=0.75]{\textcolor{blue}{above}}
\nbput[npos=0.25]{\textcolor{blue}{below}}
\end{pspicture}
\end{document}