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annotate scripts/image/ocean.m @ 20654:b65888ec820e draft default tip gccjit

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dmalcom gcc jit import
author Stefan Mahr <dac922@gmx.de>
date Fri, 27 Feb 2015 16:59:36 +0100
parents 7503499a252b
children
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1 ## Copyright (C) 1994-2015 John W. Eaton
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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} =} ocean ()
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21 ## @deftypefnx {Function File} {@var{map} =} ocean (@var{n})
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22 ## Create color colormap. This colormap varies from black to white with shades
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23 ## of blue.
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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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30 ## Author: Tony Richardson <arichard@stark.cc.oh.us>
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31 ## Created: July 1994
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32 ## Adapted-By: jwe
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33
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34 ## PKG_ADD: colormap ("register", "ocean");
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35 ## PKG_DEL: colormap ("unregister", "ocean");
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36
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37 function map = ocean (n = rows (colormap ()))
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39 if (nargin > 1)
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40 print_usage ();
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41 elseif (! isscalar (n))
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42 error ("ocean: N must be a scalar");
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43 endif
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44 n = double (n);
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45
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46 if (n == 1)
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47 map = [0, 0, 0];
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48 elseif (n > 1)
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49 cutin = fix (n/3);
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51 dr = (n - 1) / cutin;
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52 r = prepad ([0:dr:(n-1)], n)';
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54 dg = (n - 1) / (2 * cutin);
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55 g = prepad ([0:dg:(n-1)], n)';
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57 b = [0:(n-1)]';
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59 map = [r, g, b] / (n - 1);
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60 else
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61 map = zeros (0, 3);
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62 endif
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64 endfunction
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67 %!demo
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68 %! ## Show the 'ocean' colormap as an image
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69 %! image (1:64, linspace (0, 1, 64), repmat ((1:64)', 1, 64));
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70 %! axis ([1, 64, 0, 1], "ticy", "xy");
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71 %! colormap (ocean (64));
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72