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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 {} {} camzoom (@var{zf})
## @deftypefnx {} {} camzoom (@var{hax}, @var{zf})
## Zoom the camera in or out.
##
## A value of @var{zf} larger than 1 ``zooms in'' such that the scene appears
## magnified:
##
## @example
## @group
## hf = figure ();
## sphere (36)
## camzoom (1.2)
## @end group
## @end example
##
## A value smaller than 1 ``zooms out'' so the camera can see more of the
## scene:
##
## @example
## @group
## camzoom (0.5)
## @end group
## @end example
##
## Technically speaking, zooming affects the ``viewing angle''. The following
## command resets to the default zoom:
##
## @example
## @group
## camva ("auto")
## 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{camroll, camorbit, camlookat, camva}
## @end deftypefn
function camzoom (varargin)
[hax, varargin, nargin] = __plt_get_axis_arg__ ("camva", varargin{:});
if (nargin != 1)
print_usage ();
endif
zf = varargin{1};
if (! (isnumeric (zf) && isscalar (zf) ))
print_usage ();
endif
if (isempty (hax))
hax = gca ();
else
hax = hax(1);
endif
va = 2 * atand (tand (camva (hax)/2) / zf);
camva (hax, va);
endfunction
%!demo
%! clf;
%! peaks ();
%! camzoom (2);
%! title ("camzoom() demo #1");
%!test
%! hf = figure ("visible", "off");
%! unwind_protect
%! sphere ();
%! x = camva ();
%! camzoom (5);
%! assert (tand (x/2) / tand (camva ()/2), 5);
%! camzoom (1/5);
%! y = camva ();
%! assert (x, y, eps);
%! unwind_protect_cleanup
%! close (hf);
%! end_unwind_protect
%!test
%! hf = figure ("visible", "off");
%! unwind_protect
%! sphere ();
%! x = camva ();
%! camzoom (2);
%! y = camva ();
%! ## Matlab 2016a
%! xm = 10.339584907201974;
%! ym = 5.1803362845094822;
%! assert (tand (x/2) / tand (y/2), tand (xm/2) / tand (ym/2), 2e-14);
%! unwind_protect_cleanup
%! close (hf);
%! end_unwind_protect
%!test
%! hf = figure ("visible", "off");
%! unwind_protect
%! peaks ();
%! campos ([20, 30, 50]);
%! camtarget ([0 0 1]);
%! x = camva ();
%! camzoom (5);
%! y = camva ();
%! ## Matlab 2014a
%! xm = 13.074668029506947;
%! ym = 2.6258806698721222;
%! assert (tand (x/2) / tand (y/2), tand (xm/2) / tand (ym/2), 2e-14);
%! unwind_protect_cleanup
%! close (hf);
%! end_unwind_protect
## test hax input by creating another axis
%!test
%! hf = figure ("visible", "off");
%! unwind_protect
%! hax1 = subplot (1, 2, 1);
%! sphere (hax1);
%! hax2 = subplot (1, 2, 2);
%! sphere (hax2);
%! camzoom (hax1, 2)
%! x = camva (hax1);
%! y = camva (hax2);
%! assert (tand (y/2) / tand (x/2), 2, 2*eps);
%! unwind_protect_cleanup
%! close (hf);
%! end_unwind_protect
## Test input validation
%!error <Invalid call> camzoom (1, 2, 3)
%!error <Invalid call> camzoom (1, [2, 3])
%!error <Invalid call> camzoom ("string")
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