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## Copyright (C) 2007-2013 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} {} 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 (2)
## @deftypefnx {Function File} {} view (3)
## @deftypefnx {Function File} {} view (@var{hax}, @dots{})
## @deftypefnx {Function File} {[@var{azimuth}, @var{elevation}] =} view ()
## 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 specified with
## Cartesian coordinates @var{x}, @var{y}, and @var{z}.
##
## The call @code{view (2)} sets the viewpoint to @w{@var{azimuth} = 0}
## and @w{@var{elevation} = 90}, which is the default for 2-D graphs.
##
## The call @code{view (3)} sets the viewpoint to @w{@var{azimuth} = -37.5}
## and @w{@var{elevation} = 30}, which is the default for 3-D graphs.
##
## If the first argument @var{hax} is an axes handle, then operate on
## this axis rather than the current axes returned by @code{gca}.
##
## If no inputs are given, return the current @var{azimuth} and @var{elevation}.
## @end deftypefn
## Author: jwe
function [azimuth, elevation] = view (varargin)
[hax, varargin, nargin] = __plt_get_axis_arg__ ("view", varargin{:});
if (isempty (hax))
hax = gca ();
endif
if (nargin > 3)
print_usage ();
endif
if (nargin == 0)
x = get (hax, "view");
az = x(1);
el = x(2);
elseif (length (varargin) == 1)
x = varargin{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 (varargin) == 2)
az = varargin{1};
el = varargin{2};
endif
if (nargin > 0)
set (hax, "view", [az, el]);
else
if (nargout == 1)
azimuth = [az, el];
elseif (nargout == 2)
azimuth = az;
elevation = el;
endif
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
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