doc-en/par-projectionangledroit-en.tex

   1 \section{Right angle}
   2
   3 \subsection{Direct definition}
   4
   5 The object \Lkeyword{rightangle} allows us to specify and draw a
   6 \Index{right angle}. The syntax is: \texttt{[object=rightangle,args=$A$
   7 $B$ $C$]}
   8
   9 \begin{LTXexample}[width=7.5cm]
  10 \begin{pspicture}(-3,-2.5)(3.5,2.5)%
  11 \psframe*[linecolor=blue!50](-3,-2.5)(3.5,2.5)
  12 \psset{lightsrc=viewpoint,viewpoint=50 30 15,Decran=40}
  13 \psset{solidmemory}
  14 %% definition du plan de projection
  15 \psSolid[object=plan,
  16    definition=equation,
  17    args={[1 0 1 0] 90},
  18    base=-4 4 -3 3,
  19    fillcolor=white,
  20    linecolor=gray!30,
  21 %   plangrid,
  22    planmarks,
  23    name=monplan]
  24 \psset{plan=monplan,visibility=false}
  25 %% definition droite d
  26 \psProjection[object=droite,
  27    definition=horizontale,
  28    args=-1,name=d]
  29 \psset{fontsize=15}
  30 %% definition du point M
  31 \psProjection[object=point,
  32    args=-2 1,
  33    name=M,text=M,
  34    pos=ul]
  35 %% definition du point H
  36 \psProjection[object=point,
  37    definition=orthoproj,
  38    args=M d,
  39    name=H,text=H,
  40    pos=dr]
  41 %% definition du point H' pour orienter l'angle droit
  42 %% et mettre la legende
  43 \psProjection[object=point,
  44    definition=xdpoint,
  45    args=2 d,name=H',
  46    action=none,
  47    text=d,pos=ur]
  48 %% definition d'une ligne
  49 \psProjection[object=line,
  50    args=M H]
  51 %% dessin angle droit
  52 \psProjection[object=rightangle,
  53    args=M H H']
  54 \composeSolid
  55 %\axesIIID(4,4,2)(5,5,6)
  56 \end{pspicture}
  57 \end{LTXexample}
  58
  59 \endinput