function circles2d(varargin)
%CIRCLES2D Description of functions operating on circles
%
% Circles are represented by their center and their radius:
% C = [xc yc r];
% One sometimes considers orientation of circle, by adding an extra
% boolean value in 4-th position, with value TRUE for direct (i.e.
% turning Counter-clockwise) circles.
%
% Circle arcs are represented by their center, their radius, the starting
% angle and the angle extent, both in degrees:
% CA = [xc yc r theta0 dtheta];
%
% Ellipses are represented by their center, their 2 semi-axis length, and
% their angle (in degrees) with Ox direction.
% E = [xc yc A B theta];
%
% See also:
% ellipses2d, createCircle, createDirectedCircle,
% isPointInCircle, isPointOnCircle, enclosingCircle, circumCircle
% intersectLineCircle, intersectCircles, radicalAxis
% circleToPolygon, circleArcToPolyline
% drawCircle, drawCircleArc
%
% ------
% Author: David Legland
% e-mail: david.legland@grignon.inra.fr
% Created: 2008-10-13, using Matlab 7.4.0.287 (R2007a)
% Copyright 2010 INRA - Cepia Software Platform.
help('circles2d');