function [dataX, dataY, centerPoint] = centerCart(dataX, dataY)
% center cartesian coordinates
%
% 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/>

%% info
% Occasionally, plain circles are fittet to the boundary data. For these
%   cases, it is beneficial to have the data centered, like here.
% The original requirement of this step is to ensure that the origin is
%   inside of the boundary curve.

%% yeah
centerPoint = -1*[mean(dataX); mean(dataY)];
dataX = dataX + centerPoint(1);
dataY = dataY + centerPoint(2);