Angle.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2009-2011  Sandro Santilli <strk@keybit.net>
 *
 * 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/CGAlgorithms.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 = CGAlgorithms::COUNTERCLOCKWISE;

        static const int CLOCKWISE = CGAlgorithms::CLOCKWISE;

        static const int NONE = CGAlgorithms::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