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par-codejps-en.tex
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\section{The \Index{jps code}}
\textit{jps code} contains all the PostScript code that is used by the library
developed for the software \textit{jps2ps}.
The \texttt{solides.pro} file of the \texttt{solides3d} package
contains all the elements native
to that library, which contains about $4\, 500$~functions and
procedures.
It allows us to have available some adapted commands in mathematical form, without
having to construct them with the primitives
\verb+moveto+, \verb+lineto+, \verb+curveto+, etc.
For example, we can define a function $F$ with $F(t) =
(3\cos^3 t, 3\sin^3 t)$, and draw its curve
%I'm not sure of the distinction between the curve and the path, as you use it
with the \textit{jps code} \verb+0 360 {F} CourbeR2+.
If we only want to have the path of that curve, we use the code
\verb+0 360 {F} CourbeR2_+,
and if we want to add this to the stack of points of the curve,
we use \verb+0 360 {F} CourbeR2++.
In all of the $3$~examples below, the number of points is declared by the global
variable \Lkeyword{resolution}.
In other words, with the \Index{function} $F$ named above and a fixed resolution of 36, the \textit{jps code}
\begin{verbatim}
0 360 {F} CourbeR2+
\end{verbatim}
is equivalent to the PostScript code
\begin{verbatim}
0 10 360 {
/angle exch def
3 angle cos 3 exp mul
3 angle sin 3 exp mul
} for
\end{verbatim}
We haven't yet developed documentation for the library hidden in the
\texttt{solides.pro} file. For the moment we refer the
\textit{Guide de l'utilisateur de jps2ps} for the interested user
available at the website \url{melusine.eu.org/syracuse/bbgraf}.
\endinput

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