par-projectionligne-en.tex
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	\section{Lines}

	\subsection{Direct definition}

	The object \Lkeyword{line} defines a \Index{line} (or a series of line
	segments). We use the option \Lkeyword{args} to specify the points:
	\texttt{[object=line,args=$A_0$ $A_1$ \ldots $A_n$]}

	We can also define a line that has been transformed using a
	translation, a rotation, a homothety, etc., as though it were a
	polygon.

	\begin{LTXexample}[width=7.5cm]
	\begin{pspicture}(-3,-3)(4,3.5)%
	\psframe*[linecolor=blue!50](-3,-3)(4,3.5)
	\psset{lightsrc=50 20 20,viewpoint=50 30 15,Decran=60}
	\psset{solidmemory}
	\psSolid[object=grille,
	base=-3 0 -3 3,
	linewidth=0.5\pslinewidth,linecolor=gray,]
	%% definition du plan de projection
	\psSolid[object=plan,
	definition=equation,
	args={[1 0 0 0] 90},
	base=-3.2 3.2 -2.2 2.2,
	name=monplan,
	planmarks]
	\psset{plan=monplan}
	\psSolid[object=plan,
	args=monplan,
	linecolor=gray!40,
	plangrid,
	action=none]
	\psProjection[object=line,
	args=-1 0 -3 1 1 2,
	name=P]
	\psProjection[object=line,
	definition=rotatepol,
	linecolor=blue,
	args=P -1 0 -45]
	%% du code jps dans la definition
	\psProjection[object=line,
	definition={2 -2 addv} papply,
	linestyle=dashed,
	args=P]
	\composeSolid
	\axesIIID(4,2,2)(5,4,3)
	\end{pspicture}
	\end{LTXexample}

	\endinput