Mercurial > octave
annotate scripts/image/copper.m @ 31706:597f3ee61a48 stable
update Octave Project Developers copyright for the new year
author | John W. Eaton <jwe@octave.org> |
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date | Fri, 06 Jan 2023 13:11:27 -0500 |
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1 ######################################################################## |
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2 ## |
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3 ## Copyright (C) 1999-2023 The Octave Project Developers |
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4 ## |
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5 ## See the file COPYRIGHT.md in the top-level directory of this |
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6 ## distribution or <https://octave.org/copyright/>. |
6788 | 7 ## |
8 ## This file is part of Octave. | |
9 ## | |
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10 ## Octave is free software: you can redistribute it and/or modify it |
6788 | 11 ## under the terms of the GNU General Public License as published by |
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12 ## the Free Software Foundation, either version 3 of the License, or |
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13 ## (at your option) any later version. |
6788 | 14 ## |
15 ## Octave is distributed in the hope that it will be useful, but | |
16 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
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17 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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18 ## GNU General Public License for more details. |
6788 | 19 ## |
20 ## You should have received a copy of the GNU General Public License | |
7016 | 21 ## along with Octave; see the file COPYING. If not, see |
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22 ## <https://www.gnu.org/licenses/>. |
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23 ## |
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24 ######################################################################## |
6788 | 25 |
26 ## -*- texinfo -*- | |
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27 ## @deftypefn {} {@var{map} =} copper () |
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28 ## @deftypefnx {} {@var{map} =} copper (@var{n}) |
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29 ## Create color colormap. This colormap varies from black to a light copper |
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30 ## tone. |
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31 ## |
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32 ## The argument @var{n} must be a scalar. |
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33 ## If unspecified, the length of the current colormap, or 64, is used. |
6788 | 34 ## @seealso{colormap} |
35 ## @end deftypefn | |
36 | |
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37 function map = copper (n) |
6788 | 38 |
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39 if (nargin == 1) |
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40 if (! isscalar (n)) |
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41 error ("copper: N must be a scalar"); |
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42 endif |
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43 n = double (n); |
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44 else |
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45 hf = get (0, "currentfigure"); |
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46 if (! isempty (hf)) |
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47 n = rows (get (hf, "colormap")); |
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48 else |
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49 n = 64; |
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50 endif |
6788 | 51 endif |
52 | |
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53 if (n == 1) |
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54 map = [0, 0, 0]; |
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55 elseif (n > 1) |
16466 | 56 x = [0:(n-1)]' / (n - 1); |
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57 r = (x < 4/5) .* (5/4 * x) ... |
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58 + (x >= 4/5); |
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59 g = 0.7812 * x; |
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60 b = 0.4975 * x; |
6788 | 61 map = [r, g, b]; |
62 else | |
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63 map = zeros (0, 3); |
6788 | 64 endif |
65 | |
66 endfunction | |
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67 |
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68 |
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69 %!demo |
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70 %! ## Show the 'copper' colormap profile and as an image |
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71 %! cmap = copper (256); |
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72 %! subplot (2, 1, 1); |
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73 %! rgbplot (cmap, "composite"); |
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74 %! subplot (2, 1, 2); |
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75 %! rgbplot (cmap); |