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/**
*  \file geom.h
*  \brief Various geometrical calculations
*
*  Authors:
*   Nathan Hurst <njh@mail.csse.monash.edu.au>
*
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
* You should have received a copy of the MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*
*/

#ifndef LIB2GEOM_SEEN_GEOM_H
#define LIB2GEOM_SEEN_GEOM_H

//TODO: move somewhere else

#include <vector>
#include "point.h"

namespace Geom {

enum IntersectorKind {
intersects = 0,
parallel,
coincident,
no_intersection
};

int
intersector_ccw(const Geom::Point& p0, const Geom::Point& p1,
const Geom::Point& p2);

/* intersectors */

IntersectorKind
line_intersection(Geom::Point const &n0, double const d0,
Geom::Point const &n1, double const d1,
Geom::Point &result);

IntersectorKind
segment_intersect(Geom::Point const &p00, Geom::Point const &p01,
Geom::Point const &p10, Geom::Point const &p11,
Geom::Point &result);

IntersectorKind
line_twopoint_intersect(Geom::Point const &p00, Geom::Point const &p01,
Geom::Point const &p10, Geom::Point const &p11,
Geom::Point &result);

int centroid(std::vector<Geom::Point> p, Geom::Point& centroid, double &area);

}

#endif