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-\section{Polygons}
-
-\subsection{Direct definition}
-
-The object \Lkeyword{polygone} allows us to define a \Index{polygon}. We use
-the option \Lkeyword{args} to specify the list of vertices:
-\texttt{[object=polygone,args=$A_0$ $A_1$ \ldots $A_n$]}
-
-There are other ways to define a polygon in 2D. The options
-\Lkeyword{definition} and \Lkeyword{args} support these methods:
-
-\begin{itemize}
-
-%% syntaxe : pol u --> pol'
-\item \texttt{\Lkeyword{definition}=\Lkeyword{translatepol}};
-\texttt{\Lkeyword{args}=$pol$ $u$}.
-
-Translation of the polygon $pol$ by the
-vector $\vec u$
-
-%% syntaxe : pol u --> pol'
-\item \texttt{\Lkeyword{definition}=\Lkeyword{rotatepol}};
-\texttt{\Lkeyword{args}=$pol$ $I$ $\alpha $}.
-
-Image of the polygon $pol$
-after a rotation with centre $I$ and angle $\alpha $
-
-%% syntaxe : pol I alpha --> pol'
-\item \texttt{\Lkeyword{definition}=\Lkeyword{hompol}};
-\texttt{\Lkeyword{args}=$pol$ $I$ $\alpha $}.
-
-Image of the polygon $pol$
-after a homothety (dilation) with centre $I$ and ratio $\alpha$.
-
-%% syntaxe : pol I --> pol'
-\item \texttt{\Lkeyword{definition}=\Lkeyword{sympol}};
-\texttt{\Lkeyword{args}=$pol$ $I$}.
-
-Image of the polygon $pol$ after a
-reflection in the point $I$.
-
-%% syntaxe : pol D --> pol'
-\item \texttt{\Lkeyword{definition}=\Lkeyword{axesympol}};
-\texttt{\Lkeyword{args}=$pol$ $d$}.
-
-Image of the polygon $pol$ after a
-reflection in the line $d$.
-\end{itemize}
-
-
-In the following example we define, name and draw the polygon with
-vertices $(-1,0)$, $(-3, 1)$, $(0, 2)$, then---in blue---the
-image after a rotation about the point $(-1,0)$ through an angle
-$-45$. Finally, we translate the polygon with the vector shift
-$(2,-2)$ by directly incorporating \textit{jps code} within the
-argument of \Lkeyword{definition}.
-
-\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=polygone,
- args=-1 0 -3 1 0 2,
- name=P,
-]
-\psProjection[object=polygone,
- definition=rotatepol,
- linecolor=blue,
- args=P -1 0 -45,
-]
-%% du code jps dans la definition
-\psProjection[object=polygone,
- definition={2 -2 addv} papply,
- fillstyle=hlines,hatchcolor=yellow,
- linestyle=dashed,
- args=P,
-]
-\composeSolid
-\axesIIID(4,2,2)(5,4,3)
-\end{pspicture}
-\end{LTXexample}
-
-\endinput