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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{a} =} camva ()
## @deftypefnx {} {} camva (@var{a})
## @deftypefnx {} {@var{mode} =} camva ("mode")
## @deftypefnx {} {} camva (@var{mode})
## @deftypefnx {} {} camva (@var{hax}, @dots{})
## Get or set the camera viewing angle.
##
## The camera has a viewing angle which determines how much can be seen. By
## default this is:
##
## @example
## @group
## hf = figure();
## sphere (36)
## a = camva ()
## @result{} a = 10.340
## @end group
## @end example
##
## To get a wider-angle view, we could double the viewing angle. This will
## also set the mode to manual:
##
## @example
## @group
## camva (2*a)
## camva ("mode")
## @result{} manual
## @end group
## @end example
##
## We can set it back to automatic:
##
## @example
## @group
## camva ("auto")
## camva ("mode")
## @result{} auto
## camva ()
## @result{} ans = 10.340
## 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{campos, camtarget, camup}
## @end deftypefn
function a = camva (varargin)
[hax, varargin, nargin] = __plt_get_axis_arg__ ("camva", varargin{:});
if (nargin > 1)
print_usage ();
endif
if (isempty (hax))
hax = gca ();
else
hax = hax(1);
endif
prop = "cameraviewangle";
if (nargin == 0)
a = get (hax, prop);
elseif (nargin == 1 && isnumeric (varargin{1}) && isscalar (varargin{1}))
set (hax, prop, varargin{1});
elseif (nargin == 1 && ischar (varargin{1}))
s = varargin{1};
if (strcmp (s, "mode"))
a = get (hax, [prop "mode"]);
else
set (hax, [prop "mode"], s);
endif
else
print_usage ();
endif
endfunction
%!demo
%! clf;
%! peaks ();
%! title ("camva() demo #1");
%! ## query the viewing angle
%! a1 = camva ()
%! ## get a close-up view by decreasing the viewing angle:
%! camva (0.5*a1);
%! a2 = camva ()
%!test
%! hf = figure ("visible", "off");
%! unwind_protect
%! sphere ();
%! x = camva ();
%! camva (5);
%! y = camva ();
%! assert (y, 5);
%! camva (x);
%! x2 = camva ();
%! assert (x, x2);
%! unwind_protect_cleanup
%! close (hf);
%! end_unwind_protect
%!test
%! hf = figure ("visible", "off");
%! unwind_protect
%! sphere ();
%! a_orig = camva ();
%! m = camva ("mode");
%! assert (strcmp (m, "auto"));
%!
%! camva (15);
%! m = camva ("mode");
%! assert (strcmp (m, "manual"));
%!
%! camva ("auto");
%! a = camva ();
%! assert (a, a_orig);
%! unwind_protect_cleanup
%! close (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); sphere (); hax2 = gca ();
%! camva (hax1, 5);
%! subplot (1, 2, 1);
%! x = camva ();
%! z = camva (hax2);
%! subplot (1, 2, 2);
%! y = camva ();
%! assert (x, 5);
%! assert (abs (z - 5) > 1);
%! assert (y, z);
%! unwind_protect_cleanup
%! close (hf);
%! end_unwind_protect
## Test input validation
%!error <Invalid call> camva (1, 2)
%!error <invalid value>
%! hf = figure ("visible", "off");
%! unwind_protect
%! camva ("mod")
%! unwind_protect_cleanup
%! delete (hf);
%! end_unwind_protect
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