par-commandestrace-en.tex
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	\section{Commands for drawing}

	The parameter for \Index{drawing} comes with the key value \Lkeyword{action} within the command
	\Lcs{psSolid}.

	Four values are possible:
	\begin{compactitem}
	\item \Lkeyval{none}: nothing is drawn.
	\item \Lkeyval{draw}: draws the solid as a framework and sets up dashed lines for the hidden edges.
	\item \Lkeyval{draw*}: draws the solid with dashed lines for the hidden edges and colours the visible faces.
	\item \Lkeyword{draw**}: draws the solid with a painting algorithm, without the
	hidden edges and with colouration of the visible faces.
	\end{compactitem}
	\encadre{The key values \Lkeyval{draw} and \Lkeyword{draw*} only make sense for convex solids.}

	\begin{center}
	%%

	\psset{viewpoint=50 -20 30 rtp2xyz}
	%%
	\hfil
	\begin{pspicture}(-2.5,-2.5)(2.5,2.5)
	\psframe(-2.5,-2.5)(2.5,2.5)
	\psset{Decran=20}
	\psSolid[object=cube,action=draw,RotZ=20]%
	\rput(-1,-2){\texttt{draw}}
	\end{pspicture}
	\hfil
	%%
	\begin{pspicture}(-2.5,-2.5)(2.5,2.5)
	\psframe(-2.5,-2.5)(2.5,2.5)
	\psset{Decran=20}
	\psSolid[object=cube,action=draw*,fillcolor=magenta!20,RotZ=20]%
	\rput(-1,-2){\texttt{draw*}}
	\end{pspicture}
	\hfil
	%%
	\begin{pspicture}(-2.5,-2.5)(2.5,2.5)
	\psframe(-2.5,-2.5)(2.5,2.5)
	\psset{Decran=20}
	\psSolid[object=cube,fillcolor=magenta!20,RotZ=20]%
	\rput(-1,-2){\texttt{draw**}}
	\end{pspicture}
	\hfil
	%%
	\end{center}

	\endinput