%%
%% A DANTE-Edition example
%%
%% Example 16-04-10 on page 245.
%%
%% 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-add}
\begin{document}
\begin{pspicture}(4,6)
\circlenode{A}{A}\quad\circlenode{C}{C}
\quad\circlenode{E}{E}
\rput(0,4){\circlenode{B}{B}}
\rput(1,5){\circlenode{D}{D}}
\rput(2,6){\circlenode{F}{F}}
{\psset{arrowscale=2,linearc=0.2,
linecolor=red,armA=0.5,angleA=90}
\ncdiagg[lineAngle=-160]{->}{A}{B}
\ncput*[nrot=:U]{line I}
\ncdiagg[lineAngle=-160]{->}{C}{D}
\ncput*[nrot=:U]{line II}
\ncdiagg[lineAngle=-160]{->}{E}{F}
\ncput*[nrot=:U]{line III}}
\end{pspicture}
\end{document}
