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%%
%% 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}
\usepackage[utf8]{inputenc}
\StartShownPreambleCommands
\usepackage{pst-thick,pst-node,multido}
\StopShownPreambleCommands
\begin{document}
\begin{pspicture}(-1,-3)(10,3)
\psthick[curveonly,E=2,K=45]{0}{10}{\fonctionSinus{10}{2}}
\multido{\i=0+1}{11}{%
\pnode(! /t \i\space def /E 2 def /K 45 def
/dt 10 360 div def \fonctionSinus{10}{2}
/ds dx dup mul dy dup mul add sqrt def
/dx dx ds div def /dy dy ds div def
/dx' K cos dx mul K sin dy mul sub def
/dy' K sin dx mul K cos dy mul add def
/nx E 2 div dy' mul neg def % normale x
/ny E 2 div dx' mul def % normale y
x0 nx add y0 ny add ){A}
\psdot[linecolor=red](A) \pnode(! x0 nx sub y0 ny sub ){B}
\psdot[linecolor=red](B) \psdot(!t O t mul sin A mul) \psline(A)(B)}
\parametricplot[linestyle=dashed]{0}{10}{ t O t mul sin A mul }
\psaxes(0,0)(-1,-3)(10,3)
\end{pspicture}
\end{document}
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