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annotate extra/tk_octave/rainbow.m @ 0:6b33357c7561 octave-forge

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Initial revision
author pkienzle
date Wed, 10 Oct 2001 19:54:49 +0000
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children 33df0c93ed95
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1 ## Copyright (C) 1999,2000 Kai Habel
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2 ##
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3 ## This program is free software; you can redistribute it and/or modify
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4 ## it under the terms of the GNU General Public License as published by
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5 ## the Free Software Foundation; either version 2 of the License, or
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6 ## (at your option) any later version.
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7 ##
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8 ## This program is distributed in the hope that it will be useful,
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9 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 ## GNU General Public License for more details.
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12 ##
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13 ## You should have received a copy of the GNU General Public License
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14 ## along with this program; if not, write to the Free Software
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15 ## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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16
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17 ## -*- texinfo -*-
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18 ## @deftypefn {Function File} {} hsv (@var{n})
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19 ## Create color colormap.
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20 ## (red through yellow, green, cyan,blue,magenta to red)
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21 ## The argument @var{n} should be a scalar. If it
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22 ## is omitted, the length of the current colormap or 64 is assumed.
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23 ## @end deftypefn
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24 ## @seealso{colormap}
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25
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26 ## Author: Kai Habel <kai.habel@gmx.de>
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27
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28 ## 2001-09-13 Paul Kienzle <pkienzle@users.sf.net>
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29 ## * renamed to rainbow for use with tk_octave
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30 ## * remove reference to __current_color_map__
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31
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32 function map = rainbow (number)
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33
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34 if (nargin == 0)
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35 number = length(colormap);
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36 elseif (nargin == 1)
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37 if (! is_scalar (number))
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38 error ("hsv: argument must be a scalar");
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39 endif
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40 else
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41 usage ("hsv (number)");
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42 endif
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43
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44 if (number == 1)
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45 map = [1, 0, 0];
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46 elseif (number > 1)
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47 h = linspace (0, 1, number)';
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48 map = hsv2rgb ([h, ones(number, 1), ones(number, 1)]);
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49 else
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50 map = [];
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51 endif
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52
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53 endfunction