|
2847
|
1 ## Copyright (C) 1996, 1997 John W. Eaton |
|
2313
|
2 ## |
|
|
3 ## This file is part of Octave. |
|
|
4 ## |
|
|
5 ## Octave is free software; you can redistribute it and/or modify it |
|
|
6 ## under the terms of the GNU General Public License as published by |
|
|
7 ## the Free Software Foundation; either version 2, or (at your option) |
|
|
8 ## any later version. |
|
|
9 ## |
|
|
10 ## Octave is distributed in the hope that it will be useful, but |
|
|
11 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
|
|
12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|
|
13 ## General Public License for more details. |
|
|
14 ## |
|
|
15 ## You should have received a copy of the GNU General Public License |
|
|
16 ## along with Octave; see the file COPYING. If not, write to the Free |
|
|
17 ## Software Foundation, 59 Temple Place - Suite 330, Boston, MA |
|
|
18 ## 02111-1307, USA. |
|
1024
|
19 |
|
3381
|
20 ## -*- texinfo -*- |
|
3373
|
21 ## @deftypefn {Function File} {} colormap (@var{map}) |
|
|
22 ## @deftypefnx {Function File} {} colormap ("default") |
|
2311
|
23 ## Set the current colormap. |
|
3426
|
24 ## |
|
3373
|
25 ## @code{colormap (@var{map})} sets the current colormap to @var{map}. The |
|
|
26 ## color map should be an @var{n} row by 3 column matrix. The columns |
|
|
27 ## contain red, green, and blue intensities respectively. All entries |
|
|
28 ## should be between 0 and 1 inclusive. The new colormap is returned. |
|
3426
|
29 ## |
|
3373
|
30 ## @code{colormap ("default")} restores the default colormap (a gray scale |
|
|
31 ## colormap with 64 entries). The default colormap is returned. |
|
3426
|
32 ## |
|
3373
|
33 ## With no arguments, @code{colormap} returns the current color map. |
|
|
34 ## @end deftypefn |
|
559
|
35 |
|
3202
|
36 ## Author: Tony Richardson <arichard@stark.cc.oh.us> |
|
2312
|
37 ## Created: July 1994 |
|
|
38 ## Adapted-By: jwe |
|
904
|
39 |
|
2312
|
40 function cmap = colormap (map) |
|
559
|
41 |
|
3106
|
42 global __current_color_map__ = gray (); |
|
559
|
43 |
|
1062
|
44 if (nargin > 1) |
|
|
45 usage ("colormap (map)"); |
|
|
46 endif |
|
559
|
47 |
|
1024
|
48 if (nargin == 1) |
|
3238
|
49 |
|
1024
|
50 if (isstr (map)) |
|
|
51 if (strcmp (map, "default")) |
|
3238
|
52 map = gray (); |
|
559
|
53 else |
|
4463
|
54 map = eval (map); |
|
559
|
55 endif |
|
3238
|
56 endif |
|
|
57 |
|
|
58 if (! isempty (map)) |
|
|
59 if (columns (map) != 3) |
|
3458
|
60 error ("colormap: map must have 3 columns: [R,G,B]"); |
|
3238
|
61 endif |
|
|
62 if (min (min (map)) < 0 || max (max (map)) > 1) |
|
3458
|
63 error ("colormap: map must have values in [0,1]"); |
|
3238
|
64 endif |
|
2303
|
65 ## Set the new color map |
|
3103
|
66 __current_color_map__ = map; |
|
559
|
67 endif |
|
3238
|
68 |
|
559
|
69 endif |
|
|
70 |
|
2303
|
71 ## Return current color map. |
|
3103
|
72 cmap = __current_color_map__; |
|
1024
|
73 |
|
559
|
74 endfunction |
