%% 
%%  Ein Beispiel der DANTE-Edition
%% 
%% 
%%  Copyright (C) 2010 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[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{190.324pt}
\setlength\parindent{0pt}
\StartShownPreambleCommands
\usepackage{pstricks-add}
\StopShownPreambleCommands
\begin{document}
\begin{pspicture}(-5,-5)(5,5)
\psparametricplot[variableLW,startLW=1pt,endLW=60pt,linecolor=red,variableColor,
  algebraic,plotpoints=3000,plotstyle=curve,opacity=0.4,strokeopacity=0.4,
  endWL=600]{-5}{5}{t*sin(t) | t*cos(t)}
\end{pspicture}
\end{document}