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+## Copyright (C) 2007 David Bateman
+##
+## 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} {} pie (@var{y})
+## @deftypefnx {Function File} {} pie (@var{y}, @var{explode})
+## @deftypefnx {Function File} {} pie (@dots{}, @var{labels})
+## @deftypefnx {Function File} {} pie (@var{h}, @dots{});
+## @deftypefnx {Function File} {@var{h} =} pie (@dots{});
+## Produce a pie chart. 
+##
+## Called with a single vector arrgument, produces a pie chart of the
+## elements in @var{x}, with the size of the slice determined by percentage
+## size of the values of @var{x}.
+##
+## The variable @var{explode} is a vector of the same length as @var{x} that
+## if non zero 'explodes' the slice from the pie chart.
+##
+## If given @var{labels} is a cell array of strings of the same length as
+## @var{x}, giving the labels of each of the slices of the pie chart. 
+##
+## The optional return value @var{h} provides a handle to the patch object.
+##
+## @seealso{bar, stem}
+## @end deftypefn
+
+## Very roughly based on pie.m from octave-forge whose author was
+## Daniel Heiserer <Daniel.heiserer@physik.tu-muenchen.de>
+
+function retval = pie (varargin)
+
+  if (nargin < 1)
+    print_usage ();
+  elseif (isscalar (varargin{1}) && ishandle (varargin{1}))
+    h = varargin {1};
+    if (! strcmp (get (h, "type"), "axes"))
+      error ("pie: expecting first argument to be an axes object");
+    endif
+    oldh = gca ();
+    unwind_protect
+      axes (h);
+      newplot ();
+      tmp = __pie__ (h, varargin{2:end});
+    unwind_protect_cleanup
+      axes (oldh);
+    end_unwind_protect
+  else
+    newplot ();
+    tmp = __pie__ (gca (), varargin{:});
+  endif
+
+  if (nargout > 0)
+    retval = tmp;
+  endif
+endfunction
+
+function hlist = __pie__ (varargin)
+  h = varargin{1};
+  x = abs (varargin{2});
+  iarg = 3;
+
+  if (! isvector (x))
+    error ("pie: expecting vector argument");
+  endif
+
+  len = length (x);
+
+  while (iarg <= nargin)
+    arg = varargin {iarg++};
+    if (iscell (arg))
+      labels = arg;
+      if (! size_equal (x, labels))
+	error ("pie: mismatch in number of labels and data");
+      endif
+    elseif (isnumeric (arg))
+      explode = arg;
+      if (! size_equal (x, explode))
+	error ("pie: mismatch in number of elements in explode and data");
+      endif
+    endif
+  endwhile
+
+  if (! exist ("explode", "var"))
+    explode = zeros (size (x));
+  endif
+
+  if (! exist ("labels", "var"))
+    xp = round (100 * x ./ sum (x)); 
+    for i = 1 : len
+      labels{i} = sprintf ("%d%%", xp(i));
+    endfor
+  endif
+
+  hlist = [];
+  refinement = 90;
+  phi = 0 : refinement : 360;
+  xphi = cumsum (x / sum(x) * 360);
+  for i = 1 : len 
+    if (i == 1)
+      xn = 0 : 360 / refinement : xphi(i);
+    else
+      xn = xphi(i-1) : 360 / refinement : xphi(i);
+    endif
+
+    if (xn (length (xn)) != xphi(i))
+      xn = [xn, xphi(i)];
+    endif
+
+    xn2 = (xn(1) + xn(end)) / 2;
+    if (explode (i))
+      xoff = - 0.1 * sind (xn2);
+      yoff = 0.1 * cosd (xn2);
+    else
+      xoff = 0;
+      yoff = 0;
+    endif
+    xt = - 1.2 * sind (xn2);
+    yt = 1.2 * cosd (xn2);
+    if (xt > 0)
+      align = "left";
+    else
+      align = "right";
+    endif
+
+    hlist = [hlist; patch(xoff + [0, - sind(xn)], yoff + [0, cosd(xn)], i);
+    	     text(xt, yt, labels {i}, "HorizontalAlignment", align)];
+  endfor
+  if (len == 1)
+    set (h, "clim", [1, 2]);
+  else
+    set (h, "clim", [1, len]);
+  endif
+  axis ([-1.5,1.5,-1.5,1.5]);
+endfunction
+