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annotate scripts/image/copper.m @ 20038:9fc020886ae9

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maint: Clean up m-files to follow Octave coding conventions. Try to trim long lines to < 80 chars. Use '##' for single line comments. Use '(...)' around tests for if/elseif/switch/while. Abut cell indexing operator '{' next to variable. Abut array indexing operator '(' next to variable. Use space between negation operator '!' and following expression. Use two newlines between endfunction and start of %!test or %!demo code. Remove unnecessary parens grouping between short-circuit operators. Remove stray extra spaces (typos) between variables and assignment operators. Remove stray extra spaces from ends of lines.
author Rik <rik@octave.org>
date Mon, 23 Feb 2015 14:54:39 -0800
parents 4197fc428c7d
children 7503499a252b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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4197fc428c7d maint: Update copyright notices for 2015.
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1 ## Copyright (C) 1999-2015 Kai Habel
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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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 (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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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
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23 ## a light copper tone.
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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}
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27 ## @end deftypefn
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28
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29 ## Author: Kai Habel <kai.habel@gmx.de>
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30
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31 ## PKG_ADD: colormap ("register", "copper");
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32 ## PKG_DEL: colormap ("unregister", "copper");
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33
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34 function map = copper (n = rows (colormap ()))
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35
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36 if (nargin > 1)
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37 print_usage ();
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38 elseif (! isscalar (n))
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39 error ("copper: N must be a scalar");
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40 endif
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41 n = double (n);
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42
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43 if (n == 1)
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44 map = [0, 0, 0];
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45 elseif (n > 1)
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46 x = [0:(n-1)]' / (n - 1);
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47 r = (x < 4/5) .* (5/4 * x) ...
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48 + (x >= 4/5);
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49 g = 0.7812 * x;
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50 b = 0.4975 * x;
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51 map = [r, g, b];
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52 else
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53 map = zeros (0, 3);
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54 endif
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55
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56 endfunction
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57
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58
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59 %!demo
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60 %! ## Show the 'copper' colormap as an image
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61 %! image (1:64, linspace (0, 1, 64), repmat ((1:64)', 1, 64));
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62 %! axis ([1, 64, 0, 1], "ticy", "xy");
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63 %! colormap (copper (64));
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