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## Copyright (C) 2010-2013 David Bateman
##
## 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 3 of the License, 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, see
## <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {} whitebg ()
## @deftypefnx {Function File} {} whitebg (@var{color})
## @deftypefnx {Function File} {} whitebg ("none")
## @deftypefnx {Function File} {} whitebg (@var{hfig}, @dots{})
## Invert the colors in the current color scheme.
##
## The root properties are also inverted such that all subsequent plot use the
## new color scheme.
##
## If the optional argument @var{color} is present then the background color
## is set to @var{color} rather than inverted. @var{color} may be a string
## representing one of the eight known colors or an RGB triplet. The special
## string argument @qcode{"none"} restores the plot to the default colors.
##
## If the first argument @var{hfig} is a figure handle, then operate on
## this figure rather than the current figure returned by @code{gcf}. The
## root properties will not be changed.
## @seealso{reset, get, set}
## @end deftypefn
function whitebg (varargin)
h = 0;
color = NaN;
if (nargin > 0 && nargin < 3)
if (ishandle (varargin{1}))
h = varargin{1};
if (nargin == 2)
color = varargin{2};
endif
elseif (nargin == 1)
color = varargin{1};
else
print_usage ();
endif
elseif (nargin != 0)
print_usage ();
endif
typ = get (h, "type");
if (strcmp (typ, "root"))
isroot = true;
fig = gcf ();
elseif (strcmp (typ, "figure"))
isroot = false;
fig = h;
else
error ("expecting a figure handle");
endif
axes = findall (fig, "type", "axes");
if (isnan (color))
## Root figure. Set the default axes and figure properties so that
## subsequent plots have the new color scheme
if (isroot)
fac = get (0, "factory");
fields = fieldnames (fac);
fieldindex = intersect (find (!cellfun ("isempty", regexp (fields, 'color'))), union (find (!cellfun ("isempty", regexp (fields, 'factoryaxes.*'))), find (!cellfun ("isempty", regexp (fields, 'factoryfigure.*')))));
## Check whether the factory value has been replaced
for nf = 1 : numel (fieldindex);
defaultfield = strrep (fields {fieldindex (nf)}, "factory", "default");
try
defaultvalue = 1 - get (0, defaultfield {n});
catch
field = fields {fieldindex (nf)};
defaultvalue = 1 - subsref (fac, struct ("type", ".", "subs", field));
end_try_catch
set (0, defaultfield, defaultvalue);
endfor
endif
## Load all objects which qualify for being searched.
handles = fig;
h = fig;
while (numel (handles))
children = [];
for n = 1 : numel (handles)
children = union (children, get (handles(n), "children"));
endfor
handles = children;
h = union (h, children);
endwhile
for nh = 1 : numel (h)
p = get (h (nh));
fields = fieldnames (p);
fieldindex = find (!cellfun ("isempty", regexp (fields, 'color')));
if (numel (fieldindex))
for nf = 1 : numel (fieldindex);
field = fields {fieldindex (nf)};
c = subsref (p, struct ("type", ".", "subs", field));
if (! ischar (c) && columns (c) == 3)
set (h (nh), field, 1 - c);
endif
endfor
endif
## If h(nh) is a figure or axes invert default color properties
typ = subsref (p, struct ("type", ".", "subs", "type"));
if (strcmp (typ, "axes") || strcmp (typ, "figure"))
def = get (h (nh), "default");
fields = fieldnames (def);
if (! isempty (fields))
fieldindex = find (!cellfun ("isempty", regexp (fields, 'color')));
for nf = 1 : numel (fieldindex)
defaultfield = fields {fieldindex (nf)};
defaultvalue = 1 - subsref (def, struct ("type", ".", "subs", defaultfield));
set (h (nh), defaultfield, defaultvalue);
endfor
endif
endif
endfor
else
## FIXME
## Is this the right thing to do in this case?
set (findall (fig, "type", "axes"), "color", color);
if (isroot)
defs = get (0, "default");
if (isfield (defs, "defaultaxescolor")
&& strcmp (defs.defaultaxescolor, "none"))
set (0, "defaultaxescolor", color);
endif
endif
endif
endfunction
%!test
%! dac = get (0, "defaultaxescolor");
%! dfc = get (0, "defaultfigurecolor");
%! hf = figure ("visible", "off");
%! unwind_protect
%! l = line;
%! assert (get (hf, "color"), dfc);
%! assert (get (gca, "color"), dac);
%! whitebg (hf);
%! assert (get (hf, "color"), 1 - dfc);
%! assert (get (gca, "color"), 1 - dac);
%! c = [0.2 0.2 0.2];
%! whitebg (hf, c);
%! assert (get (hf, "color"), 1 - dfc);
%! assert (get (gca, "color"), c);
%! unwind_protect_cleanup
%! close (hf);
%! end_unwind_protect
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