Mercurial > octave
annotate scripts/image/ocean.m @ 27919:1891570abac8
update Octave Project Developers copyright for the new year
In files that have the "Octave Project Developers" copyright notice,
update for 2020.
author | John W. Eaton <jwe@octave.org> |
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date | Mon, 06 Jan 2020 22:29:51 -0500 |
parents | b442ec6dda5c |
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update Octave Project Developers copyright for the new year
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1 ## Copyright (C) 1994-2020 The Octave Project Developers |
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2 ## |
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3 ## See the file COPYRIGHT.md in the top-level directory of this distribution |
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4 ## or <https://octave.org/COPYRIGHT.html/>. |
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5 ## |
2313 | 6 ## |
7 ## This file is part of Octave. | |
8 ## | |
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9 ## Octave is free software: you can redistribute it and/or modify it |
2313 | 10 ## under the terms of the GNU General Public License as published by |
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11 ## the Free Software Foundation, either version 3 of the License, or |
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12 ## (at your option) any later version. |
2313 | 13 ## |
14 ## Octave is distributed in the hope that it will be useful, but | |
15 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
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16 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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17 ## GNU General Public License for more details. |
2313 | 18 ## |
19 ## You should have received a copy of the GNU General Public License | |
7016 | 20 ## along with Octave; see the file COPYING. If not, see |
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21 ## <https://www.gnu.org/licenses/>. |
559 | 22 |
3381 | 23 ## -*- texinfo -*- |
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24 ## @deftypefn {} {@var{map} =} ocean () |
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25 ## @deftypefnx {} {@var{map} =} ocean (@var{n}) |
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26 ## Create color colormap. This colormap varies from black to white with shades |
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27 ## of blue. |
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28 ## |
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29 ## The argument @var{n} must be a scalar. |
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30 ## If unspecified, the length of the current colormap, or 64, is used. |
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31 ## @seealso{colormap} |
3373 | 32 ## @end deftypefn |
1024 | 33 |
3202 | 34 ## Author: Tony Richardson <arichard@stark.cc.oh.us> |
2312 | 35 ## Created: July 1994 |
36 ## Adapted-By: jwe | |
1024 | 37 |
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38 function map = ocean (n) |
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40 if (nargin > 1) |
6046 | 41 print_usage (); |
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42 elseif (nargin == 1) |
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43 if (! isscalar (n)) |
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44 error ("ocean: N must be a scalar"); |
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45 endif |
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46 n = double (n); |
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47 else |
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48 hf = get (0, "currentfigure"); |
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49 if (! isempty (hf)) |
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50 n = rows (get (hf, "colormap")); |
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51 else |
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52 n = 64; |
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53 endif |
559 | 54 endif |
55 | |
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56 if (n == 1) |
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57 map = [0, 0, 0]; |
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58 elseif (n > 1) |
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59 cutin = fix (n/3); |
2325 | 60 |
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61 dr = (n - 1) / cutin; |
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62 r = prepad ([0:dr:(n-1)], n)'; |
1024 | 63 |
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64 dg = (n - 1) / (2 * cutin); |
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65 g = prepad ([0:dg:(n-1)], n)'; |
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66 |
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67 b = [0:(n-1)]'; |
1024 | 68 |
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69 map = [r, g, b] / (n - 1); |
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70 else |
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71 map = zeros (0, 3); |
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72 endif |
559 | 73 |
74 endfunction | |
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75 |
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76 |
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77 %!demo |
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78 %! ## Show the 'ocean' colormap profile and as an image |
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79 %! cmap = ocean (256); |
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80 %! subplot (2, 1, 1); |
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81 %! rgbplot (cmap, "composite"); |
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82 %! subplot (2, 1, 2); |
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83 %! rgbplot (cmap); |