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\documentclass{article}
\usepackage[a4paper,height=28cm]{geometry}
\usepackage[T1]{fontenc}
\usepackage[ansinew]{inputenc}%
\usepackage{pst-plot}
\input pst-key.tex
% 31 mai 2002 (version 0.1)
% Mluque5130@aol.com
\makeatletter
\define@key{psset}{V}{\edef\psk@interferences@V{#1}}
\define@key{psset}{f}{\edef\psk@interferences@F{#1}}
\define@key{psset}{date}{\edef\psk@interferences@date{#1}}
\define@key{psset}{pixel}{\edef\psk@interferences@pixel{#1}}
\define@key{psset}{XS1}{\edef\psk@interferences@SourceA{#1}}
\define@key{psset}{XS2}{\edef\psk@interferences@SourceB{#1}}
\define@key{psset}{phase1}{\edef\psk@interferences@phaseA{#1}}
\define@key{psset}{phase2}{\edef\psk@interferences@phaseB{#1}}
\define@key{psset}{aS1}{\edef\psk@interferences@aA{#1}}
\define@key{psset}{aS2}{\edef\psk@interferences@aB{#1}}
\define@key{psset}{xlimite}{\edef\psk@interferences@xlimite{#1}}
\define@key{psset}{ylimite}{\edef\psk@interferences@ylimite{#1}}
\define@key{psset}{amortissement}{\edef\psk@interferences@amortissement{#1}}
%
\setkeys{psset}{V=0.20,f=20,date=0.20,pixel=1,XS1=-2,XS2=2,%
                phase1=0,phase2=0,xlimite=5,ylimite=5,amortissement=2,%
                aS1=1,aS2=1}
%
\def\PSTinterferences{\pst@object{PSTinterferences}}
\def\PSTinterferences@i{\@ifnextchar[{\PSTinterferences@do}{\PSTinterferences@do[]}}
\def\PSTinterferences@do[#1]{{%
\pst@killglue
\setkeys{psset}{#1}%
\begin@OpenObj
\addto@pscode{%
 0 0 translate
% les dimensions sont en mètres
 /frequency \psk@interferences@F\space def
 /celerity \psk@interferences@V\space def
 /pixel \psk@interferences@pixel\space def
 /date \psk@interferences@date\space def
 /xS1 \psk@interferences@SourceA\space 100 div def % en m
 /xS2 \psk@interferences@SourceB\space 100 div def % en m
 /phase1 \psk@interferences@phaseA\space def % en degrés
 /phase2 \psk@interferences@phaseB\space def % en degrés
 /CoeffAmplitude1 \psk@interferences@aA\space def % entre 0 et 1
 /CoeffAmplitude2 \psk@interferences@aB\space def % entre 0 et 1
 /AmplitudeMax 0.5 pixel 2845 div sqrt mul def
 /xLimite \psk@interferences@xlimite\space 28.45 mul def % en cm
 /yLimite \psk@interferences@ylimite\space 28.45 mul def % en cm
 /BETA \psk@interferences@amortissement\space def % amortissement
 xLimite neg pixel xLimite { % balayage abscisses
 /abscissept exch def % en points
 /abscisse abscissept 2845 div def % en mètres
 yLimite neg pixel yLimite { % balayage ordonnées
 /ordonneept exch def % en points
 /ordonnee ordonneept 2845 div def % en mètres
 /d1 abscisse xS1 sub dup mul
     ordonnee dup mul add sqrt def
 /d2 abscisse xS2 sub dup mul
     ordonnee dup mul add sqrt def
 /yS1 360 frequency mul date d1 celerity div sub mul phase1 add sin
 0.5 mul CoeffAmplitude1 mul def
 /yS2 360 frequency mul date d2 celerity div sub mul phase2 add sin
  0.5 mul CoeffAmplitude2 mul def
 /yR yS1 yS2 add def
 % yR abs setgray
 yR 1 add 2 div setgray
 newpath
 abscissept ordonneept pixel 0 360 arc closepath fill stroke
 } for
 } for
 }%
\end@OpenObj
}}

\makeatother

\pagestyle{empty}
\title{Interf\'erences à la surface d'une cuve à ondes}
\author{Manuel Luque}
\date{29 mai 2002}
\begin{document}
\parindent=0pt
\multido{\rDate=0.200+0.005}{10}{%
 \scalebox{0.5}{%
    \begin{pspicture}(-8,-5)(8,5)
    \PSTinterferences[pixel=2,date=\rDate,V=0.2,f=20,xlimite=8,XS1=-4,XS2=4]%
    \end{pspicture}}
    \newpage
    }         %
\end{document}