## Copyright (C) 2005 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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
## 02110-1301, USA.

## -*- texinfo -*-
## @deftypefn {Function File} {@var{f} =} __uiobject_init_figure__ (@var{f})
## Create figure in __uiobject_list__ and make it the current figure.
## If @var{f} already exists, make it the current figure but don't
## reinitialize it.  If @var{f} is not specified, allocate a new
## figure handle and initialize it.
## @end deftypefn

## Author: jwe

function f = __uiobject_init_figure__ (f)

  __uiobject_globals__;

  if (nargin == 0 || nargin == 1)

    if (nargin == 0 || isempty (f))
      if (isempty (__uiobject_figure_handles_free_list__))
	f = max (__uiobject_handles__) + 1;
      else
	f = __uiobject_figure_handles_free_list__(1);
	__uiobject_figure_handles_free_list__(1) = [];
      endif
    endif

    __uiobject_handles__ = union (__uiobject_handles__, f);

    if (! ishandle (f))
      idx = __uiobject_alloc__ ();
      __uiobject_list__(idx).handle = f;
      __uiobject_list__(idx).object = __uiobject_figure_ctor__ ();
      __uiobject_adopt__ (0, f);
    endif
    set (0, "currentfigure", f);
  else
    print_usage ();
  endif

endfunction