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colormap.m
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1999-12-24
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## Copyright (C) 1996 John W. Eaton
##
## This file is part of Octave.
##
## Octave 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 2, or (at your option)
## any later version.
##
## Octave 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 Octave; see the file COPYING. If not, write to the Free
## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
## 02111-1307, USA.
## -*- texinfo -*-
## @deftypefn {Function File} {} colormap (@var{map})
## @deftypefnx {Function File} {} colormap ("default")
## Set the current colormap.
##
## @code{colormap (@var{map})} sets the current colormap to @var{map}. The
## color map should be an @var{n} row by 3 column matrix. The columns
## contain red, green, and blue intensities respectively. All entries
## should be between 0 and 1 inclusive. The new colormap is returned.
##
## @code{colormap ("default")} restores the default colormap (a gray scale
## colormap with 64 entries). The default colormap is returned.
##
## With no arguments, @code{colormap} returns the current color map.
## @end deftypefn
## Author: Tony Richardson <amr@mpl.ucsd.edu>
## Created: July 1994
## Adapted-By: jwe
function cmap = colormap (map)
global __current_color_map__ = gray ();
if (nargin > 1)
usage ("colormap (map)");
endif
if (nargin == 1)
if (isstr (map))
if (strcmp (map, "default"))
__current_color_map__ = gray ();
else
error ("invalid argument");
endif
else
## Set the new color map
__current_color_map__ = map;
endif
endif
## Return current color map.
cmap = __current_color_map__;
endfunction