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## Copyright (C) 1996-2013 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 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 {Command} {} figure
## @deftypefnx {Command} {} figure @var{n}
## @deftypefnx {Function File} {} figure (@var{n})
## @deftypefnx {Function File} {} figure (@dots{}, "@var{property}", @var{value}, @dots{})
## @deftypefnx {Function File} {@var{h} =} figure (@dots{})
## Create a new figure window for plotting.
##
## If no arguments are specified, a new figure with the next available number
## is created.
##
## If called with an integer @var{n}, and no such numbered figure exists, then
## a new figure with the specified number is created. If the figure already
## exists then it is made visible and becomes the current figure for plotting.
##
## Multiple property-value pairs may be specified for the figure object, but
## they must appear in pairs.
##
## The optional return value @var{h} is a graphics handle to the created figure
## object.
## @seealso{axes, gcf, clf, close}
## @end deftypefn
## Author: jwe, Bill Denney
function h = figure (varargin)
nargs = nargin;
if (mod (nargs, 2) == 0)
f = NaN;
init_new_figure = true;
else
arg = varargin{1};
if (ischar (arg))
arg = str2double (arg);
endif
if (isscalar (arg) && isfigure (arg))
f = arg;
init_new_figure = false;
varargin(1) = [];
nargs--;
elseif (isscalar (arg) && isnumeric (arg) && arg > 0 && arg == fix (arg))
f = arg;
init_new_figure = true;
varargin(1) = [];
nargs--;
else
error ("figure: N must be figure handle or figure number");
endif
endif
if (rem (nargs, 2) == 1)
error ("figure: PROPERTY/VALUE arguments must be in pairs");
endif
## Check to see if we already have a figure on the screen. If we do,
## then update it if it is different from the figure we are creating
## or switching to.
cf = get (0, "currentfigure"); # Can't use gcf () because it calls figure()
if (! isempty (cf) && cf != 0)
if (init_new_figure || cf != f)
drawnow ();
endif
endif
if (init_new_figure)
if (ismac () && strcmp (graphics_toolkit (), "fltk"))
## FIXME: Hack for fltk-aqua to work around bug #31931
f = __go_figure__ (f);
drawnow ();
if (! isempty (varargin))
set (f, varargin{:});
endif
else
f = __go_figure__ (f, varargin{:});
endif
__add_default_menu__ (f);
elseif (nargs > 0)
set (f, varargin{:});
endif
set (0, "currentfigure", f);
## When switching to figure N, make figure visible and on top of stack,
## unless visibility is explicitly switched off
if (! init_new_figure && ! any (strcmpi (varargin(1:2:end), "visible")
&& strcmpi (varargin(2:2:end), "off")))
set (f, "visible", "on");
endif
if (nargout > 0)
h = f;
endif
endfunction
%!test
%! hf = figure ("visible", "off");
%! unwind_protect
%! assert (hf, gcf);
%! assert (isfigure (hf));
%! hf2 = figure (hf, "visible", "off");
%! assert (hf, hf2);
%! assert (hf2, gcf);
%! assert (isfigure (hf2));
%! assert (get (hf2, "visible"), "off");
%! unwind_protect_cleanup
%! close (hf);
%! end_unwind_protect
%!error <N must be figure handle or figure number> figure ({1})
%!error <N must be figure handle or figure number> figure ([1 2])
%!error <N must be figure handle or figure number> figure (-1)
%!error <N must be figure handle or figure number> figure (1.5)
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