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########################################################################
##
## Copyright (C) 2007-2024 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 {} {} pie (@var{x})
## @deftypefnx {} {} pie (@dots{}, @var{explode})
## @deftypefnx {} {} pie (@dots{}, @var{labels})
## @deftypefnx {} {} pie (@var{hax}, @dots{})
## @deftypefnx {} {@var{h} =} pie (@dots{})
## Plot a 2-D pie chart.
##
## When called with a single vector argument, produce a pie chart of the
## elements in @var{x}. The size of the ith slice is the percentage that the
## element @var{x}i represents of the total sum of @var{x}:
## @code{pct = @var{x}(i) / sum (@var{x})}.
##
## The optional input @var{explode} is a vector of the same length as @var{x}
## that, if nonzero, "explodes" the slice from the pie chart.
##
## The optional input @var{labels} is a cell array of strings of the same
## length as @var{x} specifying the label for each slice.
##
## If the first argument @var{hax} is an axes handle, then plot into this axes,
## rather than the current axes returned by @code{gca}.
##
## The optional return value @var{h} is a list of handles to the patch
## and text objects generating the plot.
##
## Note: If @code{sum (@var{x}) @leq{} 1} then the elements of @var{x} are
## interpreted as percentages directly and are not normalized by @code{sum
## (x)}. Furthermore, if the sum is less than 1 then there will be a missing
## slice in the pie plot to represent the missing, unspecified percentage.
##
## @seealso{pie3, bar, hist, rose}
## @end deftypefn
## Very roughly based on pie.m from Octave Forge whose author was
## Daniel Heiserer <Daniel.heiserer@physik.tu-muenchen.de>
function h = pie (varargin)
[hax, varargin, nargin] = __plt_get_axis_arg__ ("pie", varargin{:});
if (nargin < 1)
print_usage ();
endif
if (! all (isfinite (varargin{1})))
error ("pie: all data in X must be finite");
endif
oldfig = [];
if (! isempty (hax))
oldfig = get (0, "currentfigure");
endif
unwind_protect
hax = newplot (hax);
htmp = __pie__ ("pie", hax, varargin{:});
unwind_protect_cleanup
if (! isempty (oldfig))
set (0, "currentfigure", oldfig);
endif
end_unwind_protect
if (nargout > 0)
h = htmp;
endif
endfunction
%!demo
%! clf;
%! pie ([3, 2, 1], [0, 0, 1]);
%! colormap ([1,0,0;0,1,0;0,0,1;1,1,0;1,0,1;0,1,1]);
%! title ("pie() with exploded wedge");
%!demo
%! clf;
%! pie ([3, 2, 1], [0, 0, 1], {"Cheddar", "Swiss", "Camembert"});
%! colormap ([1,0,0;0,1,0;0,0,1;1,1,0;1,0,1;0,1,1]);
%! axis ([-2,2,-2,2]);
%! title ("pie() with labels");
%!demo
%! clf;
%! pie ([0.17, 0.34, 0.41], {"Cheddar", "Swiss", "Camembert"});
%! colormap ([1,0,0;0,1,0;0,0,1;1,1,0;1,0,1;0,1,1]);
%! axis ([-2,2,-2,2]);
%! title ("pie() with missing slice");
## Test input validation
%!error <Invalid call> pie ()
%!error <all data in X must be finite> pie ([1 2 Inf])
%!error <all data in X must be finite> pie ([1 2 NaN])
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