3 \subsection{Direct definition}
5 The object \Lkeyword{cercle} allows us to define and draw a \Index{circle}.
6 In the \texttt{pst-solides3d} package, a circle in 2D is defined
7 by its centre and radius.
9 We use the option \Lkeyword{args} to specify the centre and radius of
10 the chosen circle. We can use coordinates or named variables.
12 The argument \texttt{\Lkeyword{range}=$t_{\rm min}$ $t_{\rm max}$} allows %$
13 us to specify an arc of the chosen circle.
15 As for all the other object, we can save the circle data using the
16 option \Lkeyword{name}.
18 \begin{LTXexample}[width=7.5cm]
19 \begin{pspicture}(-3,-3)(4,3.5)%
20 \psframe*[linecolor=blue!50](-3,-3)(4,3.5)
21 \psset{viewpoint=50 30 15,Decran=60}
23 %% definition du plan de projection
30 %% definition du point A
31 \psProjection[object=point,
35 \psProjection[object=cercle,
38 \psProjection[object=cercle,
39 args=1 1 .5,linecolor=blue,
45 \subsection{Some other definitions}
47 There are additional methods to define a circle in 2D. The options
48 \Lkeyword{definition} and \Lkeyword{args} give the following supported
53 \item \texttt{\Lkeyword{definition}=\Lkeyword{ABcercle}};
54 \texttt{\Lkeyword{args}=$A$ $B$ $C$}.
56 A circle through the points $A$, $B$
59 \item \texttt{\Lkeyword{definition}=\Lkeyword{diamcercle}};
60 \texttt{\Lkeyword{args}=$A$ $B$}.
62 A circle with diameter $[AB]$.