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par-positionnerpointconnu-en.tex
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R232 fabrepos2
par-positionnerpointconnu-en.tex
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\section
{
Positioning a named point
}
\begin
{
verbatim
}
\psPoint
(x,y,z)
{
name
}
\end
{
verbatim
}
This is a command similar to
\verb
+
\pnode
(! x y)
{
name
}
+. It places
the node
\texttt
{
(name)
}
at the point with the coordinates
$
(
x,y,z
)
$
,
viewed with the chosen point of view
\texttt
{
\Lkeyword
{
viewpoint
}
=vx vy vz
}
. We can
now use the point to mark it, draw lines, polygons, etc.
Let's place the centres of the atoms of the methanol molecule
$
\mathrm
{CH_
3
COH}
$
.
\begin
{
LTXexample
}
[width=8cm]
\begin
{
pspicture
}
(-4,-4)(4,5)
\psset
{
viewpoint=100 50 20 rtp2xyz,Decran=20
}
\axesIIID
(3,3,3)(20,20,20)
\psPoint
(-4.79,2.06,0)
{
C1
}
\psPoint
(-4.79,15.76,0)
{
Ox
}
\psPoint
(8.43,5.57,0)
{
C2
}
\psPoint
(-14.14,3.34,0)
{
H3
}
\psPoint
(14.14,-2.94,8.90)
{
H6
}
\psPoint
(14.14,-2.94,-8.90)
{
H7
}
\psPoint
(6.43,-16.29,0)
{
H8
}
\psline
(C1)(H3)
\psline
(C2)(H7)
\psline
(C2)(H8)
\psline
(C1)(C2)
\psline
[doubleline=true]
(C1)(Ox)
\psline
(C2)(H6)
\uput
[r]
(H3)
{
$
\mathrm
{H_
1
}
$
}
\uput
[l]
(H6)
{
$
\mathrm
{H_
2
}
$
}
\uput
[l]
(H7)
{
$
\mathrm
{H_
3
}
$
}
\uput
[l]
(H8)
{
$
\mathrm
{H_
4
}
$
}
\uput
{
0.25
}
[u](C1)
{
$
\mathrm
{C_
1
}
$
}
\uput
{
0.25
}
[d](C2)
{
$
\mathrm
{C_
2
}
$
}
\uput
{
0.25
}
[r](Ox)
{
$
\red\mathrm
{O}
$
}
\psdots
[dotstyle=o,dotsize=0.3]
(H3)(H6)(H7)(H8)
\psdots
[dotsize=0.4]
(C1)(C2)
\psdot
[linecolor=red,dotsize=0.4]
(Ox)
\end
{
pspicture
}
\end
{
LTXexample
}
\endinput
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