Mercurial > octave
annotate scripts/image/ocean.m @ 26376:00f796120a6d stable
maint: Update copyright dates in all source files.
author | John W. Eaton <jwe@octave.org> |
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date | Wed, 02 Jan 2019 16:32:43 -0500 |
parents | 6652d3823428 |
children | b442ec6dda5c |
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1 ## Copyright (C) 1994-2019 John W. Eaton |
2313 | 2 ## |
3 ## This file is part of Octave. | |
4 ## | |
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5 ## Octave is free software: you can redistribute it and/or modify it |
2313 | 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 |
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17 ## <https://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) |
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36 if (nargin > 1) |
6046 | 37 print_usage (); |
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38 elseif (nargin == 1) |
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39 if (! isscalar (n)) |
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40 error ("ocean: N must be a scalar"); |
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41 endif |
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42 n = double (n); |
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43 else |
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44 hf = get (0, "currentfigure"); |
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45 if (! isempty (hf)) |
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46 n = rows (get (hf, "colormap")); |
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47 else |
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48 n = 64; |
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49 endif |
559 | 50 endif |
51 | |
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52 if (n == 1) |
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53 map = [0, 0, 0]; |
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54 elseif (n > 1) |
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55 cutin = fix (n/3); |
2325 | 56 |
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57 dr = (n - 1) / cutin; |
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58 r = prepad ([0:dr:(n-1)], n)'; |
1024 | 59 |
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60 dg = (n - 1) / (2 * cutin); |
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61 g = prepad ([0:dg:(n-1)], n)'; |
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62 |
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63 b = [0:(n-1)]'; |
1024 | 64 |
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65 map = [r, g, b] / (n - 1); |
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66 else |
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67 map = zeros (0, 3); |
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68 endif |
559 | 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 'ocean' colormap profile and as an image |
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75 %! cmap = ocean (256); |
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76 %! subplot (2, 1, 1); |
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77 %! rgbplot (cmap, "composite"); |
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78 %! subplot (2, 1, 2); |
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79 %! rgbplot (cmap); |