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1 ## Copyright (C) 1996, 1997 John W. Eaton |
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2 ## |
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3 ## This file is part of Octave. |
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4 ## |
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5 ## Octave is free software; you can redistribute it and/or modify it |
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6 ## under the terms of the GNU General Public License as published by |
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7 ## the Free Software Foundation; either version 2, or (at your option) |
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8 ## any later version. |
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9 ## |
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10 ## Octave is distributed in the hope that it will be useful, but |
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 ## General Public License for more details. |
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14 ## |
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15 ## You should have received a copy of the GNU General Public License |
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16 ## along with Octave; see the file COPYING. If not, write to the Free |
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17 ## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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18 ## 02110-1301, USA. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {} colormap (@var{map}) |
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22 ## @deftypefnx {Function File} {} colormap ("default") |
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23 ## Set the current colormap. |
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24 ## |
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25 ## @code{colormap (@var{map})} sets the current colormap to @var{map}. The |
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26 ## color map should be an @var{n} row by 3 column matrix. The columns |
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27 ## contain red, green, and blue intensities respectively. All entries |
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28 ## should be between 0 and 1 inclusive. The new colormap is returned. |
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29 ## |
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30 ## @code{colormap ("default")} restores the default colormap (a gray scale |
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31 ## colormap with 64 entries). The default colormap is returned. |
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32 ## |
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33 ## With no arguments, @code{colormap} returns the current color map. |
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34 ## @end deftypefn |
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35 |
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36 ## Author: Tony Richardson <arichard@stark.cc.oh.us> |
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37 ## Created: July 1994 |
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38 ## Adapted-By: jwe |
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39 |
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40 function cmap = colormap (map) |
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41 |
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42 global __current_color_map__ = gray (); |
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43 |
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44 if (nargin > 1) |
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45 usage ("colormap (map)"); |
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46 endif |
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47 |
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48 if (nargin == 1) |
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49 |
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50 if (isstr (map)) |
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51 if (strcmp (map, "default")) |
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52 map = gray (); |
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53 else |
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54 map = eval (map); |
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55 endif |
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56 endif |
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57 |
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58 if (! isempty (map)) |
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59 if (columns (map) != 3) |
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60 error ("colormap: map must have 3 columns: [R,G,B]"); |
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61 endif |
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62 if (min (min (map)) < 0 || max (max (map)) > 1) |
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63 error ("colormap: map must have values in [0,1]"); |
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64 endif |
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65 ## Set the new color map |
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66 __current_color_map__ = map; |
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67 endif |
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68 |
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69 endif |
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70 |
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71 ## Return current color map. |
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72 cmap = __current_color_map__; |
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73 |
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74 endfunction |
