doc-en/par-projectionligne-en.tex

   1 \section{Lines}
   2
   3 \subsection{Direct definition}
   4
   5 The object \Lkeyword{line} defines a \Index{line} (or a series of line
   6 segments). We use the option \Lkeyword{args} to specify the points:
   7 \texttt{[object=line,args=$A_0$ $A_1$ \ldots $A_n$]}
   8
   9 We can also define a line that has been transformed using a
  10 translation, a rotation, a homothety, etc., as though it were a
  11 polygon.
  12
  13 \begin{LTXexample}[width=7.5cm]
  14 \begin{pspicture}(-3,-3)(4,3.5)%
  15 \psframe*[linecolor=blue!50](-3,-3)(4,3.5)
  16 \psset{lightsrc=50 20 20,viewpoint=50 30 15,Decran=60}
  17 \psset{solidmemory}
  18 \psSolid[object=grille,
  19    base=-3 0 -3 3,
  20    linewidth=0.5\pslinewidth,linecolor=gray,]
  21 %% definition du plan de projection
  22 \psSolid[object=plan,
  23    definition=equation,
  24    args={[1 0 0 0] 90},
  25    base=-3.2 3.2 -2.2 2.2,
  26    name=monplan,
  27    planmarks]
  28 \psset{plan=monplan}
  29 \psSolid[object=plan,
  30    args=monplan,
  31    linecolor=gray!40,
  32    plangrid,
  33    action=none]
  34 \psProjection[object=line,
  35    args=-1 0 -3 1 1 2,
  36    name=P]
  37 \psProjection[object=line,
  38    definition=rotatepol,
  39    linecolor=blue,
  40    args=P -1 0 -45]
  41 %% du code jps dans la definition
  42 \psProjection[object=line,
  43    definition={2 -2 addv} papply,
  44    linestyle=dashed,
  45    args=P]
  46 \composeSolid
  47 \axesIIID(4,2,2)(5,4,3)
  48 \end{pspicture}
  49 \end{LTXexample}
  50
  51 \endinput