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## Copyright (C) 1999,2000 Kai Habel
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 51 Franklin Street, Boston, MA 02110-1301 USA
## -*- texinfo -*-
## @deftypefn {Function File} {} rainbow (@var{n})
## Create color colormap.
## (red through yellow, green, cyan,blue,magenta to red)
## The argument @var{n} should be a scalar. If it
## is omitted, the length of the current colormap or 64 is assumed.
## @end deftypefn
## @seealso{colormap}
## Author: Kai Habel <kai.habel@gmx.de>
## 2001-09-13 Paul Kienzle <pkienzle@users.sf.net>
## * renamed to rainbow for use with tk_octave
## * remove reference to __current_color_map__
function map = rainbow (number)
if (nargin == 0)
number = length(colormap);
elseif (nargin == 1)
if (! is_scalar (number))
error ("rainbow: argument must be a scalar");
endif
else
usage ("rainbow (number)");
endif
if (number == 1)
map = [1, 0, 0];
elseif (number > 1)
h = linspace (0, 1, number)';
map = hsv2rgb ([h, ones(number, 1), ones(number, 1)]);
else
map = [];
endif
endfunction
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