par-projectionangledroit-en.tex
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	\section{Right angle}

	\subsection{Direct definition}

	The object \Lkeyword{rightangle} allows us to specify and draw a
	\Index{right angle}. The syntax is: \texttt{[object=rightangle,args=$A$
	$B$ $C$]}

	\begin{LTXexample}[width=7.5cm]
	\begin{pspicture}(-3,-2.5)(3.5,2.5)%
	\psframe*[linecolor=blue!50](-3,-2.5)(3.5,2.5)
	\psset{lightsrc=viewpoint,viewpoint=50 30 15,Decran=40}
	\psset{solidmemory}
	%% definition du plan de projection
	\psSolid[object=plan,
	definition=equation,
	args={[1 0 1 0] 90},
	base=-4 4 -3 3,
	fillcolor=white,
	linecolor=gray!30,
	% plangrid,
	planmarks,
	name=monplan]
	\psset{plan=monplan,visibility=false}
	%% definition droite d
	\psProjection[object=droite,
	definition=horizontale,
	args=-1,name=d]
	\psset{fontsize=15}
	%% definition du point M
	\psProjection[object=point,
	args=-2 1,
	name=M,text=M,
	pos=ul]
	%% definition du point H
	\psProjection[object=point,
	definition=orthoproj,
	args=M d,
	name=H,text=H,
	pos=dr]
	%% definition du point H' pour orienter l'angle droit
	%% et mettre la legende
	\psProjection[object=point,
	definition=xdpoint,
	args=2 d,name=H',
	action=none,
	text=d,pos=ur]
	%% definition d'une ligne
	\psProjection[object=line,
	args=M H]
	%% dessin angle droit
	\psProjection[object=rightangle,
	args=M H H']
	\composeSolid
	%\axesIIID(4,4,2)(5,5,6)
	\end{pspicture}
	\end{LTXexample}

	\endinput