/usr/share/octave/packages/geometry-1.7.0/geom2d/circleAsPolygon.m is in octave-geometry 1.7.0-1build1.
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## Copyright (C) 2004-2011 INRA - CEPIA Nantes - MIAJ (Jouy-en-Josas)
## Copyright (C) 2012 Adapted to Octave by Juan Pablo Carbajal <carbajal@ifi.uzh.ch>
## All rights reserved.
##
## Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are met:
##
## 1 Redistributions of source code must retain the above copyright notice,
## this list of conditions and the following disclaimer.
## 2 Redistributions in binary form must reproduce the above copyright
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## -*- texinfo -*-
## @deftypefn {Function File} {@var{P} = } circleAsPolygon (@var{circle}, @var{N})
## Convert a circle into a series of points
##
## P = circleAsPolygon(CIRCLE, N);
## convert circle given as [x0 y0 r], where x0 and y0 are coordinate of
## center, and r is the radius, into an array of [(N+1)x2] double,
## containing x and y values of points.
## The polygon is closed
##
## P = circleAsPolygon(CIRCLE);
## uses a default value of N=64 points
##
## Example
## circle = circleAsPolygon([10 0 5], 16);
## figure;
## drawPolygon(circle);
##
## @seealso{circles2d, polygons2d, createCircle}
## @end deftypefn
function varargout = circleAsPolygon(circle, varargin)
# determines number of points
N = 64;
if ~isempty(varargin)
N = varargin{1};
end
# create circle
t = linspace(0, 2*pi, N+1)';
x = circle(1) + circle(3)*cos(t);
y = circle(2) + circle(3)*sin(t);
if nargout==1
varargout{1}=[x y];
elseif nargout==2
varargout{1}=x;
varargout{2}=y;
end
endfunction
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