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## Copyright (C) 2006-2013 Kai Habel
##
## 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} {} shading (@var{type})
## @deftypefnx {Function File} {} shading (@var{hax}, @var{type})
## Set the shading of patch or surface graphic objects.
##
## Valid arguments for @var{type} are
##
## @table @asis
## @item @qcode{"flat"}
## Single colored patches with invisible edges.
##
## @item @qcode{"faceted"}
## Single colored patches with visible edges.
##
## @item @qcode{"interp"}
## Color between patch vertices are interpolated and the patch edges are
## invisible.
## @end table
##
## If the first argument @var{hax} is an axes handle, then plot into this axis,
## rather than the current axes returned by @code{gca}.
## @seealso{fill, mesh, patch, pcolor, surf, surface, hidden}
## @end deftypefn
## Author: Kai Habel <kai.habel@gmx.de>
function shading (varargin)
[hax, varargin, nargin] = __plt_get_axis_arg__ ("shading", varargin{:});
if (nargin != 1)
print_usage ();
endif
mode = varargin{1};
if (isempty (hax))
hax = gca ();
endif
## Find all patch and surface objects that are descendants of hax
## and which are not part of a contour plot hggroup.
hlist = [];
kids = get (hax, "children");
while (! isempty (kids))
types = get (kids, "type");
hlist = [hlist; kids(strcmp(types, "patch"))];
hlist = [hlist; kids(strcmp(types, "surface"))];
parents = kids(strcmp (types, "axes"));
hglist = kids(strcmp (types, "hggroup"));
for i = 1 : numel (hglist)
props = get (hglist(i));
if (! isfield (props, "levelstep"))
parents(end+1) = hglist(i);
endif
endfor
kids = get (parents, "children");
endwhile
## FIXME: This is the old, simple code.
## Unfortunately, it also shades contour plots which is not desirable.
##hp = findobj (hax, "type", "patch");
##hs = findobj (hax, "type", "surface");
##hlist = [hp(:); hs(:)];
switch (lower (mode))
case "flat"
set (hlist, "facecolor", "flat");
set (hlist, "edgecolor", "none");
case "interp"
set (hlist, "facecolor", "interp");
set (hlist, "edgecolor", "none");
case "faceted"
set (hlist, "facecolor", "flat");
set (hlist, "edgecolor", [0 0 0]);
otherwise
error ('shading: Invalid MODE "%s"', mode);
endswitch
endfunction
%!demo
%! clf;
%! colormap ('default');
%! sombrero ();
%! shading faceted;
%! title ('shading ''faceted''');
%!demo
%! clf;
%! colormap ('default');
%! sombrero ();
%! shading flat;
%! title ('shading ''flat''');
%!demo
%! clf;
%! colormap ('default');
%! sombrero ();
%! shading interp;
%! title ('shading ''interp''');
%!demo
%! clf;
%! colormap ('default');
%! pcolor (peaks ());
%! shading faceted;
%! title ('shading ''faceted''');
%!demo
%! clf;
%! colormap ('default');
%! pcolor (peaks ());
%! shading flat;
%! title ('shading ''flat''');
%!demo
%! clf;
%! colormap ('default');
%! pcolor (peaks ());
%! shading interp;
%! title ('shading ''interp''');
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