Mercurial > octave-nkf
annotate scripts/image/gray.m @ 14640:b9c02ee24de1
new colormap options
* colormap.m: New options, list, register, and unregister.
* NEWS: Note new colormap options.
* autumn.m, bone.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, winter: Always size and return 0x3 when size < 1.
Include PKD_ADD and PKG_DEL commands to register and unregister
colormap funtions.
author | Carnë Draug <carandraug+dev@gmail.com> |
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date | Wed, 16 May 2012 16:52:08 -0400 |
parents | f205d0074687 |
children | 5f1d4def40e1 |
rev | line source |
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maint: update copyright notices for 2012
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 1994-2012 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 | |
7016 | 7 ## the Free Software Foundation; either version 3 of the License, or (at |
8 ## 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 | |
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/>. | |
559 | 18 |
3381 | 19 ## -*- texinfo -*- |
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20 ## @deftypefn {Function File} {@var{map} =} gray () |
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21 ## @deftypefnx {Function File} {@var{map} =} gray (@var{n}) |
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22 ## Create gray colormap. This colormap varies from black to white with |
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Rik <octave@nomad.inbox5.com>
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23 ## shades of gray. |
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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. |
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26 ## @seealso{colormap} |
3373 | 27 ## @end deftypefn |
1024 | 28 |
3202 | 29 ## Author: Tony Richardson <arichard@stark.cc.oh.us> |
2312 | 30 ## Created: July 1994 |
31 ## Adapted-By: jwe | |
1024 | 32 |
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33 ## PKG_ADD: colormap ("register", "gray"); |
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34 ## PKG_DEL: colormap ("unregister", "gray"); |
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35 |
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36 function map = gray (n) |
1024 | 37 |
38 if (nargin == 0) | |
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39 n = rows (colormap); |
6791 | 40 elseif (nargin == 1) |
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41 if (! isscalar (n)) |
6791 | 42 error ("gray: argument must be a scalar"); |
43 endif | |
44 else | |
6046 | 45 print_usage (); |
559 | 46 endif |
47 | |
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48 gr = [0:(n-1)]' / (n - 1); |
559 | 49 |
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50 map = [gr, gr, gr]; |
559 | 51 |
52 endfunction | |
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53 |
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54 |
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55 %!demo |
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56 %! ## Show the 'gray' colormap as an image |
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57 %! image (1:64, linspace (0, 1, 64), repmat ((1:64)', 1, 64)); |
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58 %! axis ([1, 64, 0, 1], "ticy", "xy"); |
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59 %! colormap (gray (64)); |
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60 |