%% 
%%  Ein Beispiel der DANTE-Edition
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%%  7. Auflage
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%%  Beispiel 35-00-59 auf Seite 842.
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%%  Copyright (C) 2016 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.
%% 
%% 
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% Show page(s) 1
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\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{352.81416pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage{pst-plot,pst-node,multido}
%StopShownPreambleCommands
\begin{document}
\psset{unit=0.8}
\begin{pspicture}(-1,-1)(9,9)
\psaxes[ticksize=0 -4pt]{->}(8,8)
{\psset{plotpoints=150,algebraic,linewidth=1.5pt}
\psparametricplot[linecolor=blue]{0}{10}{0.8*sqrt(t*t)|sin(t)+0.8*t}
\psparametricplot[linecolor=red]{0}{10}{2*sqrt(t)|cos(t)+0.25*t}}
% define nodes P0..P19 on first curve, nodes Q0..Q19 on second
\curvepnodes[plotpoints=20]{0}{10}{0.8*sqrt(t*t)|sin(t)+0.8*t}{P}
\curvepnodes[plotpoints=20]{0}{10}{2*sqrt(t)|cos(t)+0.25*t}{Q}
\multido{\i=0+1}{20}{\psline{<->}(P\i)(Q\i)}
\end{pspicture}
\end{document}