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## Copyright (C) 1998-2003 Joao Cardoso.
##
## 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 2 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.
##
## This file is part of plplot_octave.
## cmap = colormap([map])
##
## Set colormap1 to map; map is an n row by 3 columns matrix, representing
## red, green and blue components in the range [0..1]
##
## if map == 'default', returns and sets the default hsl colormap
## if map don't exist, return the current colormap
function ccmap = colormap(map)
global __pl
global pl_automatic_replot
__pl_init;
if (nargin == 0)
if (struct_contains(__pl, "colormap"))
cmap = __pl.colormap;
else
n = 64;
r = [zeros(n/2,1); linspace(0,1,n/2)'];
g = zeros(n,1);
b = [linspace(1,0,n/2)'; zeros(n/2,1)];
cmap = __pl.colormap = [r, g, b];
endif
if (nargout)
ccmap = cmap;
endif
return
endif
if (nargin == 1 && ischar(map) && strcmp(map, 'default'))
plscmap1n(0);
n = 64;
r = [zeros(n/2,1); linspace(0,1,n/2)'];
g = zeros(n,1);
b = [linspace(1,0,n/2)'; zeros(n/2,1)];
map = __pl.colormap = [r, g, b];
if (nargout)
ccmap = map;
endif
endif
if (nargin == 2 && ischar(map) && strcmp(map, 'register'))
# Silently ignore register option to avoid error messages from core
# octave colormaps if this version of colormap is on the path at
# octave startup, e.g. the test_octave_interactive.sh script.
return
endif
[r, c] = size(map);
if( c != 3)
help colormap
return
endif
__pl.colormap = map;
cmap = map;
map = map.*255;
plscmap1n(rows(map)); # number of colors
plscmap1(map(:,1), map(:,2), map(:,3));
plflush;#pleop;
if (exist("pl_automatic_replot"))
if (pl_automatic_replot)
## can cause problems on plot scripts that dont support automatic _replot
__pl_plotit;
endif
endif
if (nargout)
ccmap = cmap;
endif
endfunction
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