function [xl yl] = CompXYLim(xlim0, ylim0, xrange, yrange)
%COMPXYLIM  One line description goes here.
%
%   More detailed description goes here.
%
%   Syntax:
%   [xl yl] = CompXYLim(xlim0, ylim0, xrange, yrange)
%
%   Input:
%   xlim0  =
%   ylim0  =
%   xrange =
%   yrange =
%
%   Output:
%   xl     =
%   yl     =
%
%   Example
%   CompXYLim
%
%   See also

%% Copyright notice
%   --------------------------------------------------------------------
%   Copyright (C) 2011 Deltares
%       Maarten van Ormondt
%
%       Maarten.vanOrmondt@deltares.nl
%
%       P.O. Box 177
%       2600 MH Delft
%       The Netherlands
%
%   This library 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 library 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 library.  If not, see <http://www.gnu.org/licenses/>.
%   --------------------------------------------------------------------

% This tool is part of <a href="http://www.OpenEarth.eu">OpenEarthTools</a>.
% OpenEarthTools is an online collaboration to share and manage data and
% programming tools in an open source, version controlled environment.
% Sign up to recieve regular updates of this function, and to contribute
% your own tools.

%% Version <http://svnbook.red-bean.com/en/1.5/svn.advanced.props.special.keywords.html>
% Created: 29 Nov 2011
% Created with Matlab version: 7.11.0.584 (R2010b)

% $Id: $
% $Date: $
% $Author: $
% $Revision: $
% $HeadURL: $
% $Keywords: $

%%

handles=getHandles;

if xlim0(2)<xlim0(1) || ylim0(2)<ylim0(1)
    xlim0=xrange;
    ylim0=yrange;
end

pos=get(gca,'Position');
asprat=pos(4)/pos(3);

if isfield(handles.screenParameters,'coordinateSystem')
    if strcmpi(handles.screenParameters.coordinateSystem.type,'geographic')
        if abs(ylim0(2)-ylim0(1))<45
            fac=cos(pi*0.5*(ylim0(2)+ylim0(1))/180.0);
            asprat=asprat*fac;
        end
    end
end

xmin=xrange(1);
xmax=xrange(2);
ymin=yrange(1);
ymax=yrange(2);

xc=0.5*(xlim0(1)+xlim0(2));
yc=0.5*(ylim0(1)+ylim0(2));

dx=xlim0(2)-xlim0(1);
dy=ylim0(2)-ylim0(1);

if dy/dx>asprat
    dx=dy/asprat;
else
    dy=dx*asprat;
end

if dx>xmax-xmin
    r=(xmax-xmin)/dx;
    dx=dx*r;
    dy=dy*r;
end

if dy>ymax-ymin
    r=(ymax-ymin)/dy;
    dx=dx*r;
    dy=dy*r;
end

x0=xc-0.5*dx;
y0=yc-0.5*dy;

if x0<xmin
    x0=xmin;
end

if y0<ymin
    y0=ymin;
end

if x0+dx>xmax
    x0=xmax-dx;
end

if y0+dy>ymax
    y0=ymax-dy;
end

xl=[x0 x0+dx];
yl=[y0 y0+dy];

