## Copyright (C) 2005, 2006, 2007 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 {Function File} {} clf ()
## @deftypefnx {Function File} {} clf ("reset")
## @deftypefnx {Function File} {} clf (@var{hfig})
## @deftypefnx {Function File} {} clf (@var{hfig}, "reset")
## @deftypefnx {Function File} {@var{hfig} =} clf (@dots{})
## Delete the children of the current figure with visible handles.
## If @var{hfig} is specified and is an figure object handle, operate on it
## instead of the current figure.  If the optional argument @code{"reset"}
## is specified, also delete the figure's children with hidden handles.
## @seealso{cla, close, delete}
## @end deftypefn

## Author: jwe

function clf (varargin)

  if (nargin > 2)
    print_usage ();
  elseif (nargin > 1)
    if (isfigure (varargin{1}) && ischar (varargin{2})
	&& strcmpi (varargin{2}, "reset"))
      oldfig = gcf;
      hfig = varargin{1};
      do_reset = true;
    else
      print_usage ();
    endif
  elseif (nargin == 1)
    if (isfigure (varargin{1}))
      oldfig = gcf;
      hfig = varargin{1};
      do_reset = false;
    elseif (ischar (varargin{1}) && strcmpi (varargin{1}, "reset"))
      hfig = gcf;
      oldfig = hfig;
      do_reset = true;
    else
      print_usage ();
    endif
  else
    hfig = gcf;
    oldfig = hfig;
    do_reset = false;
  end

  if (do_reset)
    ## Select all the children, including the one with hidden handles.
    hc = allchild (hfig);
    reset (hfig)
  else
    ## Select only the chilren with visible handles.
    hc = get (hfig, "children");
  endif

  set (hfig, "currentaxes", []);
  ## Delete the children.
  for k = get (hfig, "children")
    if (ishandle (k))
      delete (k);
    endif
  endfor
endfunction