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[project @ 2007-07-24 19:04:51 by dbateman]
author dbateman
date Tue, 24 Jul 2007 19:04:51 +0000
parents c81a0f3f5a82
children 93c65f2a5668
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c81a0f3f5a82 [project @ 2007-07-23 22:05:29 by dbateman]
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1 ## Copyright (C) 1999,2000 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 2, or (at your option)
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8 ## 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, write to the Free
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17 ## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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18 ## 02110-1301, USA.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} hot (@var{n})
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22 ## Create color colormap. This colormap is black through dark red, red,
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23 ## orange, yellow to white. The argument @var{n} should be a scalar. If it
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24 ## is omitted, the length of the current colormap or 64 is assumed.
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25 ## @seealso{colormap}
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26 ## @end deftypefn
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27
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28 ## Author: Kai Habel <kai.habel@gmx.de>
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29
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30 function map = hot (number)
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31
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32 if (nargin == 0)
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33 number = rows (colormap);
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34 elseif (nargin == 1)
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35 if (! isscalar (number))
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36 error ("hot: argument must be a scalar");
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37 endif
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38 else
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39 print_usage ();
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40 endif
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41
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42 if (number == 1)
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43 map = [0, 0, 0];
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44 elseif (number > 1)
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45 x = linspace (0, 1, number)';
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46 r = (x < 2/5) .* (5/2 * x) + (x >= 2/5);
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47 g = (x >= 2/5 & x < 4/5) .* (5/2 * x - 1) + (x >= 4/5);
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48 b = (x >= 4/5) .* (5*x - 4);
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49 map = [r, g, b];
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50 else
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51 map = [];
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52 endif
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53
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54 endfunction