function [polarAngle, polarDistance] = convertCartToPolar(cartX, cartY)
% convert to polar data and sort for increasing angles
%
% The input data is converted to polar coordinates. The polar angle is in
%   the range [0, 2pi).
%
% THIS IS NO USER FUNCTION

% The elk-library: convex geometry applied to crystallization modeling.
%   Copyright (C) 2012 Alexander Reinhold
%
% This program 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.
%
% This program 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 this program.  If not, see <http://www.gnu.org/licenses/>

%% conversion
polarDistance = sqrt(cartX.^2 + cartY.^2);
polarAngle = mod(atan2(cartY, cartX), 2*pi);