annotate scripts/image/prism.m @ 21567:3d25f9f4a62b

maint: Eliminate Britishicisms in the code. * oct-stream.cc, __magick_read__.cc, Array.h, flag.m, lines.m, prism.m, __contour__.m: Use 'optimize' and 'color' rather than British spellings.
author Rik <rik@octave.org>
date Wed, 30 Mar 2016 21:35:51 -0700
parents 516bb87ea72e
children 894239974868
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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 {} {@var{map} =} prism ()
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21 ## @deftypefnx {} {@var{map} =} prism (@var{n})
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22 ## Create color colormap. This colormap cycles through red, orange, yellow,
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23 ## green, blue and violet with each index change.
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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.
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27 ## @seealso{colormap}
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28 ## @end deftypefn
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29
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30 ## Author: Kai Habel <kai.habel@gmx.de>
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31
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32 ## PKG_ADD: colormap ("register", "prism");
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33 ## PKG_DEL: colormap ("unregister", "prism");
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34
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35 function map = prism (n = rows (colormap ()))
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36
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37 if (nargin > 1)
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38 print_usage ();
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39 elseif (! isscalar (n))
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40 error ("prism: N must be a scalar");
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41 endif
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42
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43 if (n == 1)
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44 map = [1 0 0];
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45 elseif (n > 1)
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46 C = [1, 0, 0; 1, 1/2, 0; 1, 1, 0; 0, 1, 0; 0, 0, 1; 2/3, 0, 1];
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47 map = C(rem (0:(n-1), 6) + 1, :);
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48 else
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49 map = zeros (0, 3);
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50 endif
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51
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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 'prism' colormap profile and as an image
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57 %! cmap = prism (18); # 6 colors, therefore cycle 3 times
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58 %! subplot (2, 1, 1);
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59 %! rgbplot (cmap, "composite");
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60 %! subplot (2, 1, 2);
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61 %! rgbplot (cmap);