Mercurial > octave-nkf
annotate scripts/image/copper.m @ 20654:b65888ec820e draft default tip gccjit
dmalcom gcc jit import
author | Stefan Mahr <dac922@gmx.de> |
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date | Fri, 27 Feb 2015 16:59:36 +0100 |
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1 ## Copyright (C) 1999-2015 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} =} copper () |
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21 ## @deftypefnx {Function File} {@var{map} =} copper (@var{n}) |
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22 ## Create color colormap. This colormap varies from black to a light copper |
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23 ## tone. |
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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. |
6788 | 27 ## @seealso{colormap} |
28 ## @end deftypefn | |
29 | |
30 ## Author: Kai Habel <kai.habel@gmx.de> | |
31 | |
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32 ## PKG_ADD: colormap ("register", "copper"); |
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33 ## PKG_DEL: colormap ("unregister", "copper"); |
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34 |
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35 function map = copper (n = rows (colormap ())) |
6788 | 36 |
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37 if (nargin > 1) |
6788 | 38 print_usage (); |
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39 elseif (! isscalar (n)) |
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40 error ("copper: N must be a scalar"); |
6788 | 41 endif |
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42 n = double (n); |
6788 | 43 |
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44 if (n == 1) |
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45 map = [0, 0, 0]; |
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46 elseif (n > 1) |
16466 | 47 x = [0:(n-1)]' / (n - 1); |
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48 r = (x < 4/5) .* (5/4 * x) ... |
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49 + (x >= 4/5); |
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50 g = 0.7812 * x; |
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51 b = 0.4975 * x; |
6788 | 52 map = [r, g, b]; |
53 else | |
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54 map = zeros (0, 3); |
6788 | 55 endif |
56 | |
57 endfunction | |
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58 |
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59 |
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60 %!demo |
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61 %! ## Show the 'copper' colormap as an image |
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62 %! image (1:64, linspace (0, 1, 64), repmat ((1:64)', 1, 64)); |
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63 %! axis ([1, 64, 0, 1], "ticy", "xy"); |
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64 %! colormap (copper (64)); |
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65 |