function [polarAngle, polarDistance, permutationVector] = ...
    standardizePolar(polarAngle, polarDistance)
% sort polar data and ensure polar angle in [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/>

% make polar angle in [0, 2pi)
polarAngle = mod(polarAngle, 2*pi);

% sort data
[polarAngle, permutationVector] = sort(polarAngle, 'ascend');
polarDistance = polarDistance(permutationVector);