doc-en/.svn/text-base/par-positionnerpointconnu-en.tex.svn-base

   1 \section{Positioning a named point}
   2
   3 \begin{verbatim}
   4 \psPoint(x,y,z){name}
   5 \end{verbatim}
   6 This is a command similar to \verb+\pnode(! x y){name}+. It places
   7 the node \texttt{(name)} at the point with the coordinates $(x,y,z)$,
   8 viewed with the chosen point of view \texttt{\Lkeyword{viewpoint}=vx vy vz}. We can
   9 now use the point to mark it, draw lines, polygons, etc.
  10
  11 Let's place the centres of the atoms of the methanol molecule $\mathrm{CH_3COH}$.
  12
  13 \begin{LTXexample}[width=8cm]
  14 \begin{pspicture}(-4,-4)(4,5)
  15 \psset{viewpoint=100 50 20 rtp2xyz,Decran=20}
  16 \axesIIID(3,3,3)(20,20,20)
  17 \psPoint(-4.79,2.06,0){C1}
  18 \psPoint(-4.79,15.76,0){Ox}
  19 \psPoint(8.43,5.57,0){C2}
  20 \psPoint(-14.14,3.34,0){H3}
  21 \psPoint(14.14,-2.94,8.90){H6}
  22 \psPoint(14.14,-2.94,-8.90){H7}
  23 \psPoint(6.43,-16.29,0){H8}
  24 \psline(C1)(H3)\psline(C2)(H7)
  25 \psline(C2)(H8)\psline(C1)(C2)
  26 \psline[doubleline=true](C1)(Ox)
  27 \psline(C2)(H6)
  28 \uput[r](H3){$\mathrm{H_1}$}
  29 \uput[l](H6){$\mathrm{H_2}$}
  30 \uput[l](H7){$\mathrm{H_3}$}
  31 \uput[l](H8){$\mathrm{H_4}$}
  32 \uput{0.25}[u](C1){$\mathrm{C_1}$}
  33 \uput{0.25}[d](C2){$\mathrm{C_2}$}
  34 \uput{0.25}[r](Ox){$\red\mathrm{O}$}
  35 \psdots[dotstyle=o,dotsize=0.3](H3)(H6)(H7)(H8)
  36 \psdots[dotsize=0.4](C1)(C2)
  37 \psdot[linecolor=red,dotsize=0.4](Ox)
  38 \end{pspicture}
  39 \end{LTXexample}
  40
  41
  42 \endinput