Mercurial > octave-nkf
annotate scripts/image/pink.m @ 15720:1a800034d443
Colormap error() calls now report the input variable which is a problem.
* autumn.m, bone.m, colorcube.m, cool.m, copper.m, flag.m, gmap40.m, gray.m,
hot.m, hsv.m, jet.m, lines.m, ocean.m, pink.m, prism.m, rainbow.m, spring.m,
summer.m, white.m, winter.m: Colormap error() calls now report the input
variable which is a problem.
author | Rik <rik@octave.org> |
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date | Mon, 03 Dec 2012 09:38:58 -0800 |
parents | 5d3a684236b0 |
children | 7762d56dbc8a |
rev | line source |
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maint: update copyright notices for 2012
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1 ## Copyright (C) 2000-2012 Kai Habel |
6788 | 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 | |
7016 | 7 ## the Free Software Foundation; either version 3 of the License, or (at |
8 ## your option) any later version. | |
6788 | 9 ## |
10 ## Octave is distributed in the hope that it will be useful, but | |
11 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 ## General Public License for more details. | |
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/>. | |
6788 | 18 |
19 ## -*- texinfo -*- | |
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20 ## @deftypefn {Function File} {@var{map} =} pink () |
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21 ## @deftypefnx {Function File} {@var{map} =} pink (@var{n}) |
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22 ## Create color colormap. This colormap varies from black to white with |
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23 ## shades of gray-pink. It gives a sepia tone when used on grayscale images. |
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24 ## The argument @var{n} must be a scalar. |
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25 ## If unspecified, the length of the current colormap, or 64, is used. |
6788 | 26 ## @seealso{colormap} |
27 ## @end deftypefn | |
28 | |
29 ## Author: Kai Habel <kai.habel@gmx.de> | |
30 | |
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31 ## PKG_ADD: colormap ("register", "pink"); |
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32 ## PKG_DEL: colormap ("unregister", "pink"); |
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33 |
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34 function map = pink (n) |
6788 | 35 |
36 if (nargin == 0) | |
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37 n = rows (colormap); |
6788 | 38 elseif (nargin == 1) |
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39 if (! isscalar (n)) |
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40 error ("pink: N must be a scalar"); |
6788 | 41 endif |
42 else | |
43 print_usage (); | |
44 endif | |
45 | |
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46 if (n == 1) |
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47 map = sqrt ([1/3, 1/3, 1/3]); |
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48 elseif (n > 1) |
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49 x = linspace (0, 1, n)'; |
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50 r = (x < 3/8) .* (14/9 * x) ... |
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51 + (x >= 3/8) .* (2/3 * x + 1/3); |
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52 g = (x < 3/8) .* (2/3 * x) ... |
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53 + (x >= 3/8 & x < 3/4) .* (14/9 * x - 1/3) ... |
6788 | 54 + (x >= 3/4) .* (2/3 * x + 1/3); |
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55 b = (x < 3/4) .* (2/3 * x) ... |
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56 + (x >= 3/4) .* (2 * x - 1); |
6788 | 57 map = sqrt ([r, g, b]); |
58 else | |
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59 map = zeros (0, 3); |
6788 | 60 endif |
61 | |
62 endfunction | |
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63 |
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64 |
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65 %!demo |
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66 %! ## Show the 'pink' colormap as an image |
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67 %! image (1:64, linspace (0, 1, 64), repmat ((1:64)', 1, 64)); |
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68 %! axis ([1, 64, 0, 1], "ticy", "xy"); |
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69 %! colormap (pink (64)); |
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70 |