Mercurial > octave
annotate scripts/image/hsv.m @ 32632:2e484f9f1f18 stable
maint: update Octave Project Developers copyright for the new year
author | John W. Eaton <jwe@octave.org> |
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date | Fri, 22 Dec 2023 12:08:17 -0500 |
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1 ######################################################################## |
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2 ## |
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3 ## Copyright (C) 1999-2024 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} =} hsv () |
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28 ## @deftypefnx {} {@var{map} =} hsv (@var{n}) |
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29 ## Create color colormap. This colormap begins with red, changes through |
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30 ## yellow, green, cyan, blue, and magenta, before returning to red. |
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31 ## |
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32 ## It is useful for displaying periodic functions. The map is obtained by |
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33 ## linearly varying the hue through all possible values while keeping constant |
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34 ## maximum saturation and value. The equivalent code is |
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35 ## @code{hsv2rgb ([(0:N-1)'/N, ones(N,2)])}. |
8543 | 36 ## |
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37 ## The argument @var{n} must be a scalar. |
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38 ## If unspecified, the length of the current colormap, or 64, is used. |
6788 | 39 ## @seealso{colormap} |
40 ## @end deftypefn | |
41 | |
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42 function map = hsv (n) |
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44 if (nargin == 1) |
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45 if (! isscalar (n)) |
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46 error ("hsv: N must be a scalar"); |
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47 endif |
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48 n = double (n); |
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49 else |
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50 hf = get (0, "currentfigure"); |
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51 if (! isempty (hf)) |
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52 n = rows (get (hf, "colormap")); |
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53 else |
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54 n = 64; |
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55 endif |
6788 | 56 endif |
57 | |
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58 if (n == 1) |
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59 map = [1, 0, 0]; |
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60 elseif (n > 1) |
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61 hue = [0:n-1]' / n; |
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62 map = hsv2rgb ([hue, ones(n,1), ones(n,1)]); |
6788 | 63 else |
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64 map = zeros (0, 3); |
6788 | 65 endif |
66 | |
67 endfunction | |
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68 |
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69 |
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70 ## A better demo of this colormap would be to plot the hsv values. |
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71 %!demo |
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72 %! ## Show the 'hsv' colormap profile and as an image |
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73 %! cmap = hsv (256); |
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74 %! subplot (2, 1, 1); |
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75 %! rgbplot (cmap, "composite"); |
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76 %! subplot (2, 1, 2); |
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77 %! rgbplot (cmap); |