Angle.h

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/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2009-2011  Sandro Santilli <strk@kbt.io>
 *
 * 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.
 *
 **********************************************************************
 *
 * Last port: algorithm/Angle.java r378 (JTS-1.12)
 *
 **********************************************************************/

#ifndef GEOS_ALGORITHM_ANGLE_H
#define GEOS_ALGORITHM_ANGLE_H

#include <geos/export.h>
#include <geos/algorithm/Orientation.h> // for constants

// Forward declarations
namespace geos {
namespace geom {
class Coordinate;
}
}

namespace geos {
namespace algorithm { // geos::algorithm

//
class GEOS_DLL Angle {
public:

    static const double PI_TIMES_2; // 2.0 * PI;
    static const double PI_OVER_2; // PI / 2.0;
    static const double PI_OVER_4; // PI / 4.0;

    static const int COUNTERCLOCKWISE = Orientation::COUNTERCLOCKWISE;

    static const int CLOCKWISE = Orientation::CLOCKWISE;

    static const int NONE = Orientation::COLLINEAR;

    static double toDegrees(double radians);

    static double toRadians(double angleDegrees);

    static double angle(const geom::Coordinate& p0,
                        const geom::Coordinate& p1);

    //
    static double angle(const geom::Coordinate& p);

    static bool isAcute(const geom::Coordinate& p0,
                        const geom::Coordinate& p1,
                        const geom::Coordinate& p2);

    static bool isObtuse(const geom::Coordinate& p0,
                         const geom::Coordinate& p1,
                         const geom::Coordinate& p2);

    static double angleBetween(const geom::Coordinate& tip1,
                               const geom::Coordinate& tail,
                               const geom::Coordinate& tip2);

    static double angleBetweenOriented(const geom::Coordinate& tip1,
                                       const geom::Coordinate& tail,
                                       const geom::Coordinate& tip2);

    static double interiorAngle(const geom::Coordinate& p0,
                                const geom::Coordinate& p1,
                                const geom::Coordinate& p2);

    static int getTurn(double ang1, double ang2);

    static double normalize(double angle);

    static double normalizePositive(double angle);


    static double diff(double ang1, double ang2);
};


} // namespace geos::algorithm
} // namespace geos


#endif // GEOS_ALGORITHM_ANGLE_H