## Copyright (C) 2013-2020 The Octave Project Developers
##
## See the file COPYRIGHT.md in the top-level directory of this distribution
## or <https://octave.org/COPYRIGHT.html/>.
##
##
## 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.
##
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU General Public License for more details.
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## -*- texinfo -*-
## @deftypefn {} {} isaxes (@var{h})
## Return true if @var{h} is an axes graphics handle and false otherwise.
##
## If @var{h} is a matrix then return a logical array which is true where the
## elements of @var{h} are axes graphics handles and false where they are not.
## @seealso{isfigure, ishghandle, isgraphics}
## @end deftypefn

function retval = isaxes (h)

  if (nargin != 1)
    print_usage ();
  endif

  retval = ishghandle (h);

  if (any (retval))
    retval(retval) = strcmp (get (h(retval), "type"), "axes");
  endif

endfunction


%!test
%! hf = figure ("visible", "off");
%! unwind_protect
%!   hax = axes ();
%!   assert (isaxes (hax));
%!   assert (! isaxes (-hax));
%! unwind_protect_cleanup
%!   close (hf);
%! end_unwind_protect

%!test
%! hf = figure ("visible", "off");
%! unwind_protect
%!   hax = axes ();
%!   assert (isaxes ([hax NaN]), [true false]);
%! unwind_protect_cleanup
%!   close (hf);
%! end_unwind_protect

%!error isaxes ()
%!error isaxes (1, 2)