%% 
%%  A DANTE-Edition example
%% 
%%  Example 20-04-1 on page 312.
%% 
%%  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{375.57637pt}
\setlength\parindent{0pt}

\usepackage{pst-plot,pst-coil}
\SpecialCoor

\begin{document}
\newdimen\Y\Y=3.2cm
\fbox{\pspicture(3,3)(5,8.7)
\psclip{\pspolygon[linewidth=0pt,linestyle=none]%
  (3.0,8.7)(3.0,3.2)(3.225,7.5)(3.45,3.2)(3.675,7.5)(3.9,3.2)%
  (4.125,7.5)(4.35,3.2)(4.575,7.5)(4.8,3.2)(4.8,8.7)(3.0,8.7)}%
  \loop\ifdim\Y<8.7cm\rput(3,\Y){\psCoil[coilaspect=0,
    coilarm=0,coilheight=3,coilwidth=.1cm,linearc=.1,linewidth=.4pt]{0}{2880}}
\advance\Y by.15cm\repeat
\endpsclip
\endpspicture}\quad
%
\def\Radius{2 }
\def\radius{0.3 }
\def\speed{40 }
\pspicture(-2.2,-2.2)(2.3,2.2)
   \parametricplot[plotpoints=3000]{0}{360}{
   \radius t \speed mul cos mul
   \Radius t cos mul add
   \radius t \speed mul sin mul
   \Radius t sin mul add
  }
\endpspicture
%
\pstVerb{ /Radius 0.5 def }
\pspicture(-2.2,-2.2)(2.2,2.2)
   \parametricplot[plotpoints=3000]{0}{800}{
   \radius t \speed mul cos mul
   Radius t cos mul add
   \radius t \speed mul sin mul
   Radius t sin mul add
   Radius 0.0015 add /Radius exch def
  }
\endpspicture
\end{document}
