% CIRCLE - Draws a circle.%% Usage: circle(c, r, n)%% Arguments:  c -  A 2-vector [x y] specifying the centre.%             r -  The radius.%             n -  Optional number of sides in the polygonal approximation.%                  (defualt is 16 sides)% Copyright (c) 1996-2005 Peter Kovesi% School of Computer Science & Software Engineering% The University of Western Australia% http://www.csse.uwa.edu.au/% % Permission is hereby granted, free of charge, to any person obtaining a copy% of this software and associated documentation files (the "Software"), to deal% in the Software without restriction, subject to the following conditions:% % The above copyright notice and this permission notice shall be included in % all copies or substantial portions of the Software.%% The Software is provided "as is", without warranty of any kind.function circle(c, r, nsides, col)        if nargin == 2	nsides = 16;    end        if nargin < 4	col = [0 0 1];    end            nsides = max(round(nsides),3); % Make sure it is an integer >= 3        a = [0:2*pi/nsides:2*pi];    line(r*cos(a)+c(1), r*sin(a)+c(2), 'color', col);