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##
## Copyright (C) 2014-2021 The Octave Project Developers
##
## See the file COPYRIGHT.md in the top-level directory of this
## distribution or <https://octave.org/copyright/>.
##
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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  {} {} rotate3d
## @deftypefnx {} {} rotate3d on
## @deftypefnx {} {} rotate3d off
## @deftypefnx {} {} rotate3d (@var{hfig}, @var{option})
## Control the interactive 3-D rotation mode of a figure in the GUI.
##
## Given the option @qcode{"on"} or @qcode{"off"}, set the interactive
## rotate mode on or off.
##
## With no arguments, toggle the current rotate mode on or off.
##
## If the first argument @var{hfig} is a figure, then operate on the given
## figure rather than the current figure as returned by @code{gcf}.
##
## @seealso{pan, zoom}
## @end deftypefn

function rotate3d (varargin)

  hfig = NaN;

  nargs = nargin;

  if (nargs > 2)
    print_usage ();
  endif

  if (nargin == 1 && nargout > 0 && isfigure (varargin{1}))
    error ("rotate3d: syntax 'handle = rotate3d (hfig)' not implemented");
  endif

  if (nargs == 2)
    hfig = varargin{1};
    if (isfigure (hfig))
      varargin(1) = [];
      nargs -= 1;
    else
      error ("rotate3d: invalid figure handle HFIG");
    endif
  endif

  if (isnan (hfig))
    hfig = gcf ();
  endif

  if (nargs == 0)
    rm = get (hfig, "__rotate_mode__");
    if (strcmp (rm.Enable, "on"))
      rm.Enable = "off";
    else
      rm.Enable = "on";
    endif
    set (hfig, "__rotate_mode__", rm);
    update_mouse_mode (hfig, rm.Enable);
  elseif (nargs == 1)
    arg = varargin{1};
    if (ischar (arg))
      switch (arg)
        case {"on", "off"}
          rm = get (hfig, "__rotate_mode__");
          switch (arg)
            case {"on", "off"}
              rm.Enable = arg;
              rm.Motion = "both";
          endswitch
          set (hfig, "__rotate_mode__", rm);
          update_mouse_mode (hfig, arg);
        otherwise
          error ("rotate3d: unrecognized OPTION '%s'", arg);
      endswitch
    else
      error ("rotate3d: wrong type argument '%s'", class (arg));
    endif
  endif

endfunction

function update_mouse_mode (hfig, arg)

  if (strcmp (arg, "off"))
    set (hfig, "__mouse_mode__", "none");
  else
    ## FIXME: Is there a better way other than calling these
    ## functions to set the other mouse mode Enable fields to
    ## "off"?
    pan ("off");
    zoom ("off");
    set (hfig, "__mouse_mode__", "rotate");
  endif

endfunction
