########################################################################
##
## Copyright (C) 2020 The Octave Project Developers
##
## See the file COPYRIGHT.md in the top-level directory of this
## distribution or <https://octave.org/copyright/>.
##
## This file is part of Octave.
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## 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
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU General Public License for more details.
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## You should have received a copy of the GNU General Public License
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########################################################################

## -*- texinfo -*-
## @deftypefn {} {@var{retval} =} __tickangle__ (@var{caller}, @var{hax}, @var{angle})
## Undocumented internal function.
## @seealso{xtickangle, ytickangle, ztickangle}
## @end deftypefn

function retval = __tickangle__ (caller, hax, angle)

  ax = tolower (caller(1));
  switch (nargin)
    case 1
      retval = get (gca (), [ax, "ticklabelrotation"]);
      return;

    case 2
      if (isaxes (hax))
        retval = get (hax, [ax, "ticklabelrotation"]);
        return;
      else
        angle = hax;
        hax = [];
      endif

    case 3
      if (! isaxes (hax))
        error ([caller, ": HAX must be a handle to an axes object"]);
      endif

  endswitch

  if (! (isscalar (angle) && isnumeric (angle) && isfinite (angle)))
    error ([caller ": ANGLE must be a finite, numeric, scalar value"]);
  elseif (nargout > 0)
    error ([caller ": function called with output query and input set value"]);
  endif

  if (isempty (hax))
    hax = gca ();
  endif

  set (hax, [ax, "ticklabelrotation"], angle);

endfunction