########################################################################
##
## Copyright (C) 2020 The Octave Project Developers
##
## See the file COPYRIGHT.md in the top-level directory of this
## distribution or .
##
## 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
## .
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########################################################################
## -*- texinfo -*-
## @deftypefn {} {} xtickangle (@var{angle})
## @deftypefnx {} {@var{angle} =} xtickangle ()
## @deftypefnx {} {[@dots{}] =} xtickangle (@var{hax}, @dots{})
## Query or set the rotation angle of the tick labels on the x-axis of the current axis.
##
## When called without an argument, return the rotation angle in degrees
## of the tick labels as specified in the @qcode{"XTickLabelRotation"} axes property.
## This angle can be changed by calling @code{xtickangle} with a scalar value
## in degrees.
##
## If the first argument @var{hax} is an axes handle, then operate on
## this axis rather than the current axes returned by @code{gca}.
##
## Requesting a return value when calling @code{xtickangle} to set a property
## value will result in an error.
##
## @seealso{ytickangle, ztickangle, get, set}
## @end deftypefn
function varargout = xtickangle (varargin)
[varargout{1:nargout}] = __tickangle__ (mfilename, varargin{:});
endfunction
%!test
%! hf = figure ("visible", "off");
%! hax = axes (hf);
%! unwind_protect
%! xtickangle (45);
%! assert (xtickangle (), 45);
%! xtickangle (hax, 90);
%! a1 = xtickangle ();
%! a2 = xtickangle (hax);
%! assert (a1, a2);
%! assert (a1, 90);
%! unwind_protect_cleanup
%! close (hf);
%! end_unwind_protect
## Test input validation
%!error xtickangle (1, 2, 3)
%!error [a, b] = xtickangle ()
%!error [a, b] = xtickangle (1, 2, 3)
%!error a = xtickangle (45)
%!error xtickangle (Inf)
%!error xtickangle (NaN)
%!error xtickangle (eye (2))
%!error xtickangle ({90})
%!error xtickangle (struct ("angle", 5))
%!error xtickangle ("octave")
%!error xtickangle (0, 45)