Triangle.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2006 Refractions Research Inc.
 *
 * This is free software; you can redistribute and/or modify it under
 * the terms of the GNU Lesser General Public Licence as published
 * by the Free Software Foundation.
 * See the COPYING file for more information.
 *
 **********************************************************************/
 
#pragma once
 
#include <geos/export.h>
#include <geos/geom/Coordinate.h>
 
namespace geos {
namespace geom { // geos::geom
 
class GEOS_DLL Triangle {
public:
    Coordinate p0, p1, p2;
 
    Triangle(const Coordinate& nP0, const Coordinate& nP1, const Coordinate& nP2)
        : p0(nP0)
        , p1(nP1)
        , p2(nP2) {}
 
 
    void inCentre(Coordinate& resultPoint);
 
    void circumcentre(Coordinate& resultPoint);
    void circumcentreDD(Coordinate& resultPoint);
 
    static const Coordinate circumcentre(
        const Coordinate& p0, const Coordinate& p1, const Coordinate& p2);
 
    bool isIsoceles();
 
    static bool isAcute(const Coordinate& a, const Coordinate& b, const Coordinate& c);
 
    static bool isCCW(const Coordinate& a, const Coordinate& b, const Coordinate& c);
 
 
    static bool intersects(const Coordinate& a, const Coordinate& b, const Coordinate& c,
        const Coordinate& p);
 
 
    bool intersects(const Coordinate& p) { return intersects(p0, p1, p2, p); };
 
    bool isCCW() { return isCCW(p0, p1, p2); };
 
    bool isAcute() { return isAcute(p0, p1, p2); };
 
    static double longestSideLength(
        const Coordinate& a,
        const Coordinate& b,
        const Coordinate& c);
 
    static double length(const Coordinate& a, const Coordinate& b, const Coordinate& c);
 
    double length() const;
 
    static double area(const Coordinate& a, const Coordinate& b, const Coordinate& c);
 
    double area() const;
 
private:
 
    double det(double m00, double m01, double m10, double m11) const;
 
};
 
 
 
} // namespace geos::geom
} // namespace geos