%% 
%%  A DANTE-Edition example
%% 
%%  Example 11-03-7 on page 127.
%% 
%%  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-plot}
\SpecialCoor

\begin{document}
\begin{pspicture}[showgrid](3,3)
 \pscustom[linewidth=1.5pt]{%
   \psplot{0}{3}{x 180 mul 1.57 div sin 2 add}
   \moveto(1.5,1.5)\pscurve(3,1)(2,0)(1,1)(0,0)}
 \psline[linestyle=dotted]{->}%
     (! 3 dup 180 mul 1.57 div sin 2 add)(1.5,1.5)
\end{pspicture}
\end{document}