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########################################################################
##
## Copyright (C) 2016-2024 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.
##
## 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
## <https://www.gnu.org/licenses/>.
##
########################################################################
## -*- texinfo -*-
## @deftypefn {} {@var{p} =} campos ()
## @deftypefnx {} {} campos ([@var{x} @var{y} @var{z}])
## @deftypefnx {} {@var{mode} =} campos ("mode")
## @deftypefnx {} {} campos (@var{mode})
## @deftypefnx {} {} campos (@var{hax}, @dots{})
## Get or set the camera position.
##
## The default camera position is determined automatically based on the scene.
## For example, to get the camera position:
##
## @example
## @group
## hf = figure();
## peaks()
## p = campos ()
## @result{} p =
## -27.394 -35.701 64.079
## @end group
## @end example
##
## We can then move the camera further up the z-axis:
##
## @example
## @group
## campos (p + [0 0 10])
## campos ()
## @result{} ans =
## -27.394 -35.701 74.079
## @end group
## @end example
##
## Having made that change, the camera position @var{mode} is now manual:
##
## @example
## @group
## campos ("mode")
## @result{} manual
## @end group
## @end example
##
## We can set it back to automatic:
##
## @example
## @group
## campos ("auto")
## campos ()
## @result{} ans =
## -27.394 -35.701 64.079
## close (hf)
## @end group
## @end example
##
## By default, these commands affect the current axis; alternatively, an axis
## can be specified by the optional argument @var{hax}.
##
## @seealso{camup, camtarget, camva}
## @end deftypefn
function p = campos (varargin)
[hax, varargin, nargin] = __plt_get_axis_arg__ ("campos", varargin{:});
if (nargin > 1)
print_usage ();
endif
if (isempty (hax))
hax = gca ();
else
hax = hax(1);
endif
prop = "cameraposition";
if (nargin == 0)
p = get (hax, prop);
elseif (nargin == 1 && isnumeric (varargin{1}) && numel (varargin{1}) == 3)
set (hax, prop, varargin{1});
elseif (nargin == 1 && ischar (varargin{1}))
s = varargin{1};
if (strcmp (s, "mode"))
p = get (hax, [prop "mode"]);
else
set (hax, [prop "mode"], s);
endif
else
print_usage ();
endif
endfunction
%!demo
%! clf;
%! sphere ();
%! title ("campos() demo #1");
%! ## where is camera located?
%! x1 = campos ()
%! ## move the camera upwards
%! campos (x1 + [0 0 2]);
%! x2 = campos ()
%!test
%! hf = figure ("visible", "off");
%! unwind_protect
%! hax = axes ("parent", hf);
%! sphere (hax);
%! x = campos ();
%! campos ([1 2 3]);
%! y = campos ();
%! assert (y, [1 2 3]);
%! campos (x);
%! x2 = campos ();
%! assert (x, x2);
%! unwind_protect_cleanup
%! delete (hf);
%! end_unwind_protect
%!test
%! hf = figure ("visible", "off");
%! unwind_protect
%! sphere ();
%! p_orig = campos ();
%! m = campos ("mode");
%! assert (strcmp (m, "auto"));
%!
%! campos ([1 2 3]);
%! m = campos ("mode");
%! assert (strcmp (m, "manual"));
%!
%! campos ("auto");
%! p = campos ();
%! assert (p, p_orig);
%! unwind_protect_cleanup
%! delete (hf);
%! end_unwind_protect
## test hax input by creating another axis
%!test
%! hf = figure ("visible", "off");
%! unwind_protect
%! subplot (1, 2, 1); sphere (); hax1 = gca ();
%! subplot (1, 2, 2); peaks (); hax2 = gca ();
%! campos (hax1, [20 0 0]);
%! subplot (1, 2, 1);
%! x = campos ();
%! z = campos (hax2);
%! subplot (1, 2, 2);
%! y = campos ();
%! assert (x, [20 0 0]);
%! assert (norm (y - [20 0 0]) > 1);
%! assert (y, z);
%! unwind_protect_cleanup
%! delete (hf);
%! end_unwind_protect
## Test input validation
%!error <Invalid call> campos (1, 2)
%!error <invalid value>
%! hf = figure ("visible", "off");
%! unwind_protect
%! campos ("mod");
%! unwind_protect_cleanup
%! delete (hf);
%! end_unwind_protect
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