The object \texttt{droite} allows us to define and draw a \Index{line}. In
the \texttt{pst-solides3d} package, a line in 2D is defined by its
two end-points.
We use the option \Lkeyword{args} to specify the end-points of the
chosen line. We can use coordinates or named points.
As with points and vectors, we can save the coordinates of the
line with the option \Lkeyword{name}.
\begin{LTXexample}[width=7.5cm]
\begin{pspicture}(-3,-3)(4,3.5)%
\psframe*[linecolor=blue!50](-3,-3)(4,3.5)
\psset{viewpoint=50 30 15,Decran=60}
\psset{solidmemory}
%% definition du plan de projection
\psSolid[object=plan,
definition=equation,
args={[1 0 0 0] 90},
planmarks,name=monplan]
\psset{plan=monplan}
%% definition du point A
\psProjection[object=point,
name=A,text=A,
pos=ur](-2,1.25)
\psProjection[object=point,
name=B,text=B,
pos=ur](1,.75)
\psProjection[object=droite,
linecolor=blue,
args=0 0 1 .5]
\psProjection[object=droite,
linecolor=orange,
args=A B]
\composeSolid
\end{pspicture}
\end{LTXexample}
\subsection{Some other definitions}
There are other methods to define a line in 2D. The options
\Lkeyword{definition} and \Lkeyword{args} are used in these variants:
