## Copyright (C) 2001-2012 Paul Kienzle
##
## 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} {} orient (@var{orientation})
## Set the default print orientation.  Valid values for
## @var{orientation} include @code{"landscape"}, @code{"portrait"},
## and @code{"tall"}.
##
## The @code{"tall"} option sets the orientation to portait and fills
## the page with the plot, while leaving a 0.25in border.
##
## If called with no arguments, return the default print orientation.
## @end deftypefn

## Author: Paul Kienzle
## Adapted-By: jwe

function retval = orient (varargin)

  nargs = nargin;

  if (nargs > 0 && numel (varargin{1}) == 1 && isfigure (varargin{1}))
    cf = varargin{1};
    varargin(1) = [];
    nargs--;
  else
    cf = gcf ();
  endif

  if (nargs == 0)
    retval = get (cf, "paperorientation");
  elseif (nargin == 1)
    orientation = varargin{1};
    if (strcmpi (orientation, "landscape") || strcmpi (orientation, "portrait"))
      if (! strcmpi (get (cf, "paperorientation"), orientation))
        ## FIXME - with the proper listeners in place there won't be a need to set
        ##         the papersize and paperpostion here.
        papersize = get (cf, "papersize");
        paperposition = get (cf, "paperposition");
        set (cf, "paperorientation", orientation);
        set (cf, "papersize", papersize([2, 1]));
        set (cf, "paperposition", paperposition([2, 1, 4, 3]));
      endif
    elseif (strcmpi (varargin{1}, 'tall'))
      orient ("portrait");
      papersize = get (cf, "papersize");
      set (cf, "paperposition", [0.25, 0.25, (papersize - 0.5)]);
    else
      error ("orient: unknown ORIENTATION");
    endif
  else
    print_usage ();
  endif

endfunction

%!shared papersize, paperposition, tallpaperposition, hfig
%!  papersize = [8.5, 11];
%!  paperposition = [0.25, 2.5, 8, 6];
%!  tallpaperposition = [0.25, 0.25, (papersize-0.5)];
%!  hfig = figure ();
%!  set (hfig, "visible", "off")
%!  set (hfig, "paperorientation", "portrait")
%!  set (hfig, "papersize", papersize)
%!  set (hfig, "paperposition", paperposition)
%!test
%!  orient portrait
%!  assert (orient, "portrait") # default
%!  assert (get (hfig, "papersize"), papersize)
%!  assert (get (hfig, "paperposition"), paperposition)
%!test
%!  orient landscape
%!  assert (orient,"landscape") # change to landscape
%!  assert (get (hfig, "papersize"), papersize([2, 1]))
%!  assert (get (hfig, "paperposition"), paperposition([2, 1, 4, 3]))
%!test
%!  orient portrait # change back to portrait
%!  assert (orient, "portrait")
%!  assert (get (hfig, "papersize"), papersize)
%!  assert (get (hfig, "paperposition"), paperposition)
%!test
%!  orient landscape
%!  orient tall
%!  assert (orient, "portrait")
%!  assert (get (hfig, "papersize"), papersize)
%!  assert (get (hfig, "paperposition"), tallpaperposition)
%!fail ("orient ('nobody')", "unknown ORIENTATION")
%!test
%!  orient portrait # errors don't change the state
%!  assert (orient, "portrait")
%!  assert (get (hfig, "papersize"), papersize)
%!  assert (get (hfig, "paperposition"), tallpaperposition)
%!  close (hfig)