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[project @ 2007-10-12 21:27:11 by jwe]
author jwe
date Fri, 12 Oct 2007 21:27:37 +0000
parents 93c65f2a5668
children 1bf0ce0930be
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 ## Copyright (C) 1999, 2000, 2007 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} {} jet (@var{n})
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21 ## Create color colormap. This colormap is dark blue through blue, cyan,
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22 ## green, yellow, red to dark red. The argument @var{n} should be a scalar.
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23 ## If it is omitted, the length of the current colormap or 64 is assumed.
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24 ## @seealso{colormap}
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25 ## @end deftypefn
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26
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27 ## Author: Kai Habel <kai.habel@gmx.de>
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28
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29 function map = jet (number)
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30
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31 if (nargin == 0)
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32 number = rows (colormap);
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33 elseif (nargin == 1)
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34 if (! isscalar (number))
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35 error ("jet: argument must be a scalar");
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36 endif
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37 else
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38 print_usage ();
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39 endif
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40
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41 if (number == 1)
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42 map = [0, 0, 0.5];
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43 elseif (number > 1)
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44 x = linspace(0, 1, number)';
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45 r = (x >= 3/8 & x < 5/8) .* (4 * x - 3/2)\
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46 + (x >= 5/8 & x < 7/8) + (x >= 7/8) .* (-4 * x + 9/2);
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47 g = (x >= 1/8 & x < 3/8) .* (4 * x - 1/2)\
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48 + (x >= 3/8 & x < 5/8) + (x >= 5/8 & x < 7/8) .* (-4 * x + 7/2);
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49 b = (x < 1/8) .* (4 * x + 1/2) + (x >= 1/8 & x < 3/8)\
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50 + (x >= 3/8 & x < 5/8) .* (-4 * x + 5/2);
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51 map = [r, g, b];
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52 else
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53 map = [];
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54 endif
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55
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56 endfunction