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+\section{Polygons}
+
+\subsection{Direct definition}
+
+The object \texttt{polygone} allows us to define a polygon. We use
+the option \verb+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
+\texttt{definition} and \texttt{args} support these methods:
+
+\begin{itemize}
+
+%% syntaxe : pol u --> pol'
+\item \texttt{[definition=translatepol]};
+\verb+args=+$pol$ $u$.
+
+Translation of the polygon $pol$ by the
+vector $\vec u$
+
+%% syntaxe : pol u --> pol'
+\item \texttt{[definition=rotatepol]};
+\verb+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{[definition=hompol]};
+\verb+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{[definition=sympol]};
+\verb+args=+$pol$ $I$.
+
+Image of the polygon $pol$ after a
+reflection in the point $I$.
+
+%% syntaxe : pol D --> pol'
+\item \texttt{[definition=axesympol]};
+\verb+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 \verb+[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