doc-en/par-colorierfacettes-en.tex

   1 \section{\Index{Colouring} some single faces}
   2
   3 The key value \texttt{\Lkeyword{fcol}=$i_0$~($c_0$) $i_1$~($c_1$) \dots $i_n$~($c_n$)},
   4 where $i_k$ are integers and $c_k$ the names of the colours, permits to
   5 specify a \Index{colour} for special \Index{faces}.
   6 To the face with the index $i_k$ corresponds the colour $c_k$. The
   7 integer $n$ must be lower than the maximum of the number of faces of the chosen solid.
   8
   9
  10 %% L'option \texttt{[fcol=1 (OliveGreen) 0 (color1) 4 (color2) etc.]}
  11 %% permet de sp\'{e}cifier dans l'ordre :
  12 %% \begin{compactitem}
  13 %%   \item le num\'{e}ro de la facette  de \texttt{0} \`{a} \texttt{n-1}, pour \texttt{n} facettes ;
  14 %%   \item la couleur de la facette.
  15 %% \end{compactitem}
  16
  17 The colour names $c_k$, there are $68$~predefined values, are defined names in the
  18 \texttt{color.pro}. These values are:
  19 \textsl{GreenYellow},
  20 \textsl{Yellow},
  21 \textsl{Goldenrod},
  22 \textsl{Dandelion},
  23 \textsl{Apricot},
  24 \textsl{Peach},
  25 \textsl{Melon},
  26 \textsl{YellowOrange},
  27 \textsl{Orange},
  28 \textsl{BurntOrange},
  29 \textsl{Bittersweet},
  30 \textsl{RedOrange},
  31 \textsl{Mahogany},
  32 \textsl{Maroon},
  33 \textsl{BrickRed},
  34 \textsl{Red},
  35 \textsl{OrangeRed},
  36 \textsl{RubineRed},
  37 \textsl{WildStrawberry},
  38 \textsl{Salmon},
  39 \textsl{CarnationPink},
  40 \textsl{Magenta},
  41 \textsl{VioletRed},
  42 \textsl{Rhodamine},
  43 \textsl{Mulberry},
  44 \textsl{RedViolet},
  45 \textsl{Fuchsia},
  46 \textsl{Lavender},
  47 \textsl{Thistle},
  48 \textsl{Orchid},
  49 \textsl{DarkOrchid},
  50 \textsl{Purple},
  51 \textsl{Plum},
  52 \textsl{Violet},
  53 \textsl{RoyalPurple},
  54 \textsl{BlueViolet},
  55 \textsl{Periwinkle},
  56 \textsl{CadetBlue},
  57 \textsl{CornflowerBlue},
  58 \textsl{MidnightBlue},
  59 \textsl{NavyBlue},
  60 \textsl{RoyalBlue},
  61 \textsl{Blue},
  62 \textsl{Cerulean},
  63 \textsl{Cyan},
  64 \textsl{ProcessBlue},
  65 \textsl{SkyBlue},
  66 \textsl{Turquoise},
  67 \textsl{TealBlue},
  68 \textsl{Aquamarine},
  69 \textsl{BlueGreen},
  70 \textsl{Emerald},
  71 \textsl{JungleGreen},
  72 \textsl{SeaGreen},
  73 \textsl{Green},
  74 \textsl{ForestGreen},
  75 \textsl{PineGreen},
  76 \textsl{LimeGreen},
  77 \textsl{YellowGreen},
  78 \textsl{SpringGreen},
  79 \textsl{OliveGreen},
  80 \textsl{RawSienna},
  81 \textsl{Sepia},
  82 \textsl{Brown},
  83 \textsl{Tan},
  84 \textsl{Gray},
  85 \textsl{Black},
  86 \textsl{White}.
  87 The list of these $68$ colours is available in the command
  88 \verb+\colorfaces+ (see an example in the section about
  89 the grating  of a cube).
  90
  91 Thinking on that case, the number of the faces
  92 $\mathtt{n_1\times n_2}+2\texttt{(outer faces  inner faces)}$
  93 must be lower than 68!
  94
  95 However users can define their own \Index{colours}. There are two methods:
  96
  97 \begin{compactitem}
  98 \item They can use one of the $4$~optional arguments  \texttt{color1},
  99   \texttt{color2}, \texttt{color3}, \texttt{color4} from
 100   \Lcs{psSolid}, then transmit to \Lkeyword{fcol} a pair of the type
 101   $i$~\verb+(color1)+, where $i$ is the index of the chosen face. The
 102   arguments \texttt{color1}, etc.  are used in the same way as the
 103   arguments from \Lkeyword{color} and \Lkeyword{incolor}.\hfill \break
 104   A possible command could be the following:
 105   \begin{verbatim}
 106    \psSolid[a=1,object=cube,color1=red!60!yellow!20,fcol=0 (color1)]%
 107   \end{verbatim}
 108 \item They define their own colour names with the command
 109   \verb+\pstVerb+, and then use these names with the argument
 110   \Lkeyword{fcol}. For example:
 111 \begin{verbatim}
 112 \pstVerb{/hetre {0.764 0.6 0.204 setrgbcolor} def
 113          /chene {0.568 0.427 0.086 setrgbcolor} def
 114          /cheneclair {0.956 0.921 0.65 setrgbcolor} def
 115          }%
 116 \end{verbatim}
 117 And therefore:
 118 \begin{verbatim}
 119 fcol=0 (hetre) 1 (chene)  2 (cheneclair)
 120 \end{verbatim}
 121 \end{compactitem}
 122
 123
 124 The $4$~arguments
 125 \verb+color1+,
 126 \verb+color2+,
 127 \verb+color3+,
 128 \verb+color4+ have default values:
 129 \begin{compactitem}
 130     \item \textcolor{cyan!50}{color1=cyan!50}
 131     \item \textcolor{magenta!60}{color2=magenta!60}
 132     \item \textcolor{blue!30}{color3=blue!30}
 133     \item \textcolor{red!50}{color4=red!50}
 134 \end{compactitem}
 135
 136
 137
 138
 139 \begin{LTXexample}[width=5cm]
 140 \psset{Decran=20,viewpoint=10 5 10,unit=0.5}
 141 \begin{pspicture}(-5,-5)(5,5)
 142 \psSolid[
 143    fcol=0 (Apricot) 1 (Aquamarine)  2 (Bittersweet)
 144         3 (ForestGreen) 4 (Goldenrod)
 145         13 (GreenYellow)
 146         40 (Mulberry),
 147    object=cube,mode=3]%
 148 \end{pspicture}
 149 \end{LTXexample}
 150
 151 \begin{LTXexample}[width=4.9cm]
 152 \psset{Decran=20,viewpoint=10 5 10,unit=0.5}
 153 \begin{pspicture}(-5,-5)(5,5)
 154 \psSolid[
 155    fcol=0 (Apricot) 2 (Lavender) 3 (SkyBlue)  11 (LimeGreen) 12 (OliveGreen),
 156    object=cylindre,
 157    h=4,
 158    ngrid=4 10](0,0,-2)
 159 \end{pspicture}
 160 \end{LTXexample}
 161
 162 The choice of the faces to be coloured can be specified with some PostScript code,
 163 \begin{verbatim}
 164 fcol=48 {i (Black) i 1 add (LimeGreen) i 2 add (Yellow) /i i 3 add store} repeat
 165 \end{verbatim}
 166 which will alternately colour the faces in black, green and yellow.
 167 \begin{center}
 168 \begin{LTXexample}[width=6.5cm]
 169 \begin{pspicture}(-3,-3)(3.5,2.5)
 170 \psset{Decran=7.5,viewpoint=10 10 5}
 171 \pstVerb{/iface 0 store}%
 172 \psSolid[
 173 fcol=48 {iface (Black)
 174   iface 1 add (LimeGreen)
 175   iface 2 add (Yellow) /iface
 176   iface 3 add store} repeat,
 177   r1=4,r0=1,
 178   object=tore,
 179   ngrid=8 18,
 180   RotY=30]
 181 \end{pspicture}
 182 \end{LTXexample}
 183 \end{center}
 184
 185 When the option \Lkeyword{hue} is activated, the faces of the solid are coloured with the nuance of the rainbow colours.
 186
 187 \begin{LTXexample}[width=5.9cm]
 188 \begin{pspicture}(-3,-2.5)(3,2.5)
 189 \psset[pst-solides3d]{viewpoint=50 50 50,Decran=40,lightsrc=50 20 1e2}
 190 \psSolid[r1=5,r0=1,object=tore,ngrid=16 18,hue=0 1]%
 191 \end{pspicture}
 192 \end{LTXexample}
 193
 194 \endinput