%% 
%%  A DANTE-Edition example
%% 
%%  Example 05-01-1 on page 58.
%% 
%%  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}
\setlength\parindent{0pt}

\usepackage{pstricks}
\SpecialCoor

\begin{document}
\begin{pspicture}[showgrid](3,3)
  \psline[linewidth=3pt,linecolor=blue]%
     (3;50)(0,0)(3;10)
  \psarc[arcsep=3pt,linecolor=red]{->}{2.5}{10}{50}
  \pscircle(3;80){0.25}
  \psarc[arcsepA=3pt,arcsepB=0.25cm,%
     linecolor=red]{->}{3}{10}{80}
\end{pspicture}
\end{document}