par-projectionligne-en.tex
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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