Mercurial > octave-nkf
annotate scripts/image/rainbow.m @ 17744:d63878346099
maint: Update copyright notices for release.
author | John W. Eaton <jwe@octave.org> |
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date | Wed, 23 Oct 2013 22:09:27 -0400 |
parents | ac332eb727dd |
children | e8e3a89fa370 |
rev | line source |
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1 ## Copyright (C) 1999-2013 Kai Habel |
6788 | 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 | |
7016 | 7 ## the Free Software Foundation; either version 3 of the License, or (at |
8 ## your option) any later version. | |
6788 | 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 | |
7016 | 16 ## along with Octave; see the file COPYING. If not, see |
17 ## <http://www.gnu.org/licenses/>. | |
6788 | 18 |
19 ## -*- texinfo -*- | |
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20 ## @deftypefn {Function File} {@var{map} =} rainbow () |
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21 ## @deftypefnx {Function File} {@var{map} =} rainbow (@var{n}) |
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22 ## Create color colormap. This colormap ranges from red through orange, |
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23 ## yellow, green, blue, to violet. |
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24 ## The argument @var{n} must be a scalar. |
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25 ## If unspecified, the length of the current colormap, or 64, is used. |
6788 | 26 ## @seealso{colormap} |
27 ## @end deftypefn | |
28 | |
29 ## Author: Kai Habel <kai.habel@gmx.de> | |
30 | |
31 ## this colormap is not part of matlab, it is like the prism | |
32 ## colormap map but with a continuous map | |
33 | |
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34 ## PKG_ADD: colormap ("register", "rainbow"); |
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35 ## PKG_DEL: colormap ("unregister", "rainbow"); |
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36 |
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37 function map = rainbow (n) |
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38 |
6788 | 39 if (nargin == 0) |
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40 n = rows (colormap); |
6788 | 41 elseif (nargin == 1) |
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42 if (! isscalar (n)) |
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43 error ("rainbow: N must be a scalar"); |
6788 | 44 endif |
45 else | |
46 print_usage (); | |
47 endif | |
48 | |
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49 if (n == 1) |
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50 map = [1, 0, 0]; |
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51 elseif (n > 1) |
16466 | 52 x = [0:(n-1)]' / (n - 1); |
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53 |
16466 | 54 r = ( (x < 2/5) |
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55 + (x >= 2/5 & x < 3/5) .* (-5 * x + 3) |
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56 + (x >= 4/5) .* (10/3 * x - 8/3)); |
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57 |
16466 | 58 g = ( (x < 2/5) .* (5/2 * x) |
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59 + (x >= 2/5 & x < 3/5) |
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60 + (x >= 3/5 & x < 4/5) .* (-5 * x + 4)); |
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61 |
16466 | 62 b = ( (x >= 3/5 & x < 4/5) .* (5 * x - 3) |
63 + (x >= 4/5)); | |
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64 |
6788 | 65 map = [r, g, b]; |
66 else | |
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67 map = zeros (0, 3); |
6788 | 68 endif |
69 | |
70 endfunction | |
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71 |
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72 |
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73 %!demo |
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74 %! ## Show the 'rainbow' colormap as an image |
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75 %! image (1:64, linspace (0, 1, 64), repmat ((1:64)', 1, 64)); |
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76 %! axis ([1, 64, 0, 1], "ticy", "xy"); |
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77 %! colormap (rainbow (64)); |
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78 |