Mercurial > octave
annotate scripts/image/ocean.m @ 23220:092078913d54
maint: Merge stable to default.
author | John W. Eaton <jwe@octave.org> |
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date | Wed, 22 Feb 2017 12:58:07 -0500 |
parents | 3a2b891d0b33 3ac9f9ecfae5 |
children | 194eb4bd202b |
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1 ## Copyright (C) 1994-2017 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 | |
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7 ## the Free Software Foundation; either version 3 of the License, or |
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8 ## (at your option) any later version. |
2313 | 9 ## |
10 ## Octave is distributed in the hope that it will be useful, but | |
11 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 ## GNU General Public License for more details. |
2313 | 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/>. | |
559 | 18 |
3381 | 19 ## -*- texinfo -*- |
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20 ## @deftypefn {} {@var{map} =} ocean () |
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21 ## @deftypefnx {} {@var{map} =} ocean (@var{n}) |
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22 ## Create color colormap. This colormap varies from black to white with shades |
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23 ## of blue. |
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24 ## |
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25 ## The argument @var{n} must be a scalar. |
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26 ## If unspecified, the length of the current colormap, or 64, is used. |
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27 ## @seealso{colormap} |
3373 | 28 ## @end deftypefn |
1024 | 29 |
3202 | 30 ## Author: Tony Richardson <arichard@stark.cc.oh.us> |
2312 | 31 ## Created: July 1994 |
32 ## Adapted-By: jwe | |
1024 | 33 |
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34 function map = ocean (n = rows (colormap ())) |
1024 | 35 |
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36 if (nargin > 1) |
6046 | 37 print_usage (); |
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38 elseif (! isscalar (n)) |
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39 error ("ocean: N must be a scalar"); |
559 | 40 endif |
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41 n = double (n); |
559 | 42 |
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43 if (n == 1) |
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44 map = [0, 0, 0]; |
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45 elseif (n > 1) |
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46 cutin = fix (n/3); |
2325 | 47 |
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48 dr = (n - 1) / cutin; |
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49 r = prepad ([0:dr:(n-1)], n)'; |
1024 | 50 |
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51 dg = (n - 1) / (2 * cutin); |
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52 g = prepad ([0:dg:(n-1)], n)'; |
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53 |
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54 b = [0:(n-1)]'; |
1024 | 55 |
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56 map = [r, g, b] / (n - 1); |
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57 else |
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58 map = zeros (0, 3); |
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59 endif |
559 | 60 |
61 endfunction | |
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62 |
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63 |
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64 %!demo |
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65 %! ## Show the 'ocean' colormap profile and as an image |
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66 %! cmap = ocean (256); |
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67 %! subplot (2, 1, 1); |
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68 %! rgbplot (cmap, "composite"); |
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69 %! subplot (2, 1, 2); |
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70 %! rgbplot (cmap); |