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%%%
% Engrenages
%%%
\newtoks\tokPfCEngrenages%
\def\UpdatetoksEngrenages#1/#2\nil{\addtotok\tokPfCEngrenages{#1,#2,}}%
\setKVdefault[Engrenages]{Couleur=LightSteelBlue,Unite=3mm}
\NewDocumentCommand\Engrenages{o m}{%
\tokPfCEngrenages{}
\useKVdefault[Engrenages]%
\setKV[Engrenages]{#1}%
\setsepchar[*]{,*/}%
\ignoreemptyitems
\readlist*\ListePfCEngrenages{#2}%
\setsepchar{,}
\xdef\PfCFooEngrenages{}
\foreachitem\compteur\in\ListePfCEngrenages{%
\xdef\PfCFooEngrenages{\PfCFooEngrenages \ListePfCEngrenages[\compteurcnt,1],\ListePfCEngrenages[\compteurcnt,2],}%
}%
\BuildEngrenages{\PfCFooEngrenages}%
}%
\def\BuildEngrenagesCode#1{%
u:=\useKV[Engrenages]{Unite};
CouleurEngrenage=\useKV[Engrenages]{Couleur};
%
vardef LectureDonnees(text t)=
n:=0;k=0;l=0;
for p_=t:
n:=n+1;
if (n mod 2)=0:
l:=l+1;
Zz[l]=p_;
else:
k:=k+1;
Mm[k]=p_;
fi;
endfor;
enddef;
%
LectureDonnees(#1);
%
pair K;
K=(0,0);
picture EngrenageFinal;
EngrenageFinal=image(
trace Engrenage(Mm[1],Zz[1],(0,0));
%
Signe=1;
%
for w=2 upto (n div 2):
K:=K+pointarc(cercles((0,0),u*Mm[w]*(Zz[w-1]+Zz[w])*0.5+0.04*u),0);
AngleRot[w]:=360/(2*Zz[w]);
if w=2:
trace rotation(Engrenage(Mm[w],Zz[w],K),K,180-AngleRot[w]);
if (Zz[w] mod 2)=0:
Signe:=Signe*(-1);
fi;
else:
if (Zz[w] mod 2)=1:
if Signe=-1:
trace rotation(Engrenage(Mm[w],Zz[w],K),K,180);
else:
trace rotation(Engrenage(Mm[w],Zz[w],K),K,180-AngleRot[w]);
fi;
else:
Signe:=Signe*(-1);
if Signe=1:
trace rotation(Engrenage(Mm[w],Zz[w],K),K,180);
else:
trace rotation(Engrenage(Mm[w],Zz[w],K),K,180-AngleRot[w]);
fi;
fi;
fi;
endfor;
);
}
\NewDocumentCommand\BuildEngrenages{m}{%
\ifluatex
\mplibforcehmode
\begin{mplibcode}
input PfCEngrenages;
\BuildEngrenagesCode{#1}
trace EngrenageFinal;
\end{mplibcode}
\else
\begin{mpost}[mpsettings={input PfCEngrenages;\BuildEngrenagesCode{#1}}]
trace EngrenageFinal;
\end{mpost}
\fi
}%
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