--- /dev/null
+## Copyright (C) 2007-2012 John W. Eaton
+##
+## 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} {[@var{azimuth}, @var{elevation}] =} view ()
+## @deftypefnx {Function File} {} view (@var{azimuth}, @var{elevation})
+## @deftypefnx {Function File} {} view ([@var{azimuth} @var{elevation}])
+## @deftypefnx {Function File} {} view ([@var{x} @var{y} @var{z}])
+## @deftypefnx {Function File} {} view (@var{dims})
+## @deftypefnx {Function File} {} view (@var{ax}, @dots{})
+## Query or set the viewpoint for the current axes. The parameters
+## @var{azimuth} and @var{elevation} can be given as two arguments or as
+## 2-element vector.
+## The viewpoint can also be given with Cartesian coordinates @var{x},
+## @var{y}, and @var{z}.
+## The call @code{view (2)} sets the viewpoint to @var{azimuth} = 0
+## and @var{elevation} = 90, which is the default for 2-D graphs.
+## The call @code{view (3)} sets the viewpoint to @var{azimuth} = -37.5
+## and @var{elevation} = 30, which is the default for 3-D graphs.
+## If @var{ax} is given, the viewpoint is set for this axes, otherwise
+## it is set for the current axes.
+## @end deftypefn
+
+## Author: jwe
+
+function [azimuth, elevation] = view (varargin)
+
+ if (nargin < 4)
+ if (nargin == 0)
+ args = {get(gca (), "view")};
+ else
+ ax = varargin{1};
+ if (ishandle (ax) && strcmp (get (ax, "type"), "axes"))
+ args = varargin(2:end);
+ else
+ ax = gca;
+ args = varargin;
+ endif
+ endif
+ if (length (args) == 1)
+ x = args{1};
+ if (length (x) == 2)
+ az = x(1);
+ el = x(2);
+ elseif (length (x) == 3)
+ [az, el] = cart2sph (x(1), x(2), x(3));
+ az *= 180/pi;
+ az += 90;
+ el *= 180/pi;
+ elseif (x == 2)
+ az = 0;
+ el = 90;
+ elseif (x == 3)
+ az = -37.5;
+ el = 30;
+ else
+ print_usage ();
+ endif
+ elseif (length (args) == 2)
+ az = args{1};
+ el = args{2};
+ endif
+
+ if (nargin > 0)
+ set (ax, "view", [az, el]);
+ endif
+
+ if (nargout == 1)
+ error ("view: T = view () not implemented");
+ endif
+
+ if (nargout == 2)
+ azimuth = az;
+ elevation = el;
+ endif
+ else
+ print_usage ();
+ endif
+
+endfunction
+
+%!test
+%! hf = figure ("visible", "off");
+%! unwind_protect
+%! plot3 ([0,1], [0,1], [0,1]);
+%! [az, el] = view;
+%! assert ([az, el], [-37.5, 30], eps);
+%! view (2);
+%! [az, el] = view;
+%! assert ([az, el], [0, 90], eps);
+%! view ([1 1 0]);
+%! [az, el] = view;
+%! assert ([az, el], [135, 0], eps);
+%! unwind_protect_cleanup
+%! close (hf);
+%! end_unwind_protect
+
+%!test
+%! hf = figure ("visible", "off");
+%! unwind_protect
+%! line;
+%! [az, el] = view;
+%! assert ([az, el], [0, 90], eps);
+%! view (3);
+%! [az, el] = view;
+%! assert ([az, el], [-37.5, 30], eps);
+%! unwind_protect_cleanup
+%! close (hf);
+%! end_unwind_protect