## Copyright (C) 1995-2011 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} {} zlabel (@var{string})
## @deftypefnx {Function File} {} zlabel (@var{h}, @var{string})
## @deftypefnx {Function File} {@var{h} =} zlabel (@dots{})
## @seealso{xlabel}
## @end deftypefn

## Author: jwe

function retval = zlabel (varargin)

  [h, varargin, nargin] = __plt_get_axis_arg__ ("zlabel", varargin{:});

  if (rem (nargin, 2) != 1)
    print_usage ();
  endif

  oldh = gca ();
  unwind_protect
    axes (h);
    tmp = __axis_label__ ("zlabel", varargin{:},
                          "color", get (h, "zcolor"));
  unwind_protect_cleanup
    axes (oldh);
  end_unwind_protect

  if (nargout > 0)
    retval = tmp;
  endif

endfunction

%!test
%! hf = figure ("visible", "off");
%! unwind_protect  
%!   z = zlabel ("zlabel_string");
%!   assert (get(gca, "zlabel"), z);
%!   assert (get(z, "type"), "text");
%!   assert (get(z, "visible"), "off");
%!   assert (get(z, "string"), "zlabel_string");
%! unwind_protect_cleanup
%!   close (hf);
%! end_unwind_protect

%!test
%! hf = figure ("visible", "off");
%! plot3 (0, 0, 0);
%! unwind_protect  
%!   z = zlabel ("zlabel_string");
%!   assert (get(gca, "zlabel"), z);
%!   assert (get(z, "type"), "text");
%!   assert (get(z, "visible"), "off");
%!   assert (get(z, "string"), "zlabel_string");
%! unwind_protect_cleanup
%!   close (hf);
%! end_unwind_protect