Angle.h

00001 /**********************************************************************
00002  * $Id: Angle.h 3363 2011-05-13 16:17:38Z mloskot $
00003  *
00004  * GEOS - Geometry Engine Open Source
00005  * http://geos.refractions.net
00006  *
00007  * Copyright (C) 2009-2011  Sandro Santilli <strk@keybit.net>
00008  *
00009  * This is free software; you can redistribute and/or modify it under
00010  * the terms of the GNU Lesser General Public Licence as published
00011  * by the Free Software Foundation. 
00012  * See the COPYING file for more information.
00013  *
00014  **********************************************************************
00015  *
00016  * Last port: algorithm/Angle.java r378 (JTS-1.12)
00017  *
00018  **********************************************************************/
00019 
00020 #ifndef GEOS_ALGORITHM_ANGLE_H
00021 #define GEOS_ALGORITHM_ANGLE_H
00022 
00023 #include <geos/export.h>
00024 #include <geos/algorithm/CGAlgorithms.h> // for constants
00025 
00026 // Forward declarations
00027 namespace geos {
00028         namespace geom {
00029                 class Coordinate;
00030         }
00031 }
00032 
00033 namespace geos {
00034 namespace algorithm { // geos::algorithm
00035 
00037 //
00040 class GEOS_DLL Angle
00041 {
00042 public:
00043 
00044         static const double PI_TIMES_2; // 2.0 * PI;
00045         static const double PI_OVER_2; // PI / 2.0;
00046         static const double PI_OVER_4; // PI / 4.0;
00047 
00049         static const int COUNTERCLOCKWISE = CGAlgorithms::COUNTERCLOCKWISE;
00050 
00052         static const int CLOCKWISE = CGAlgorithms::CLOCKWISE;
00053 
00055         static const int NONE = CGAlgorithms::COLLINEAR;
00056 
00058         //
00062         static double toDegrees(double radians);
00063 
00065         //
00069         static double toRadians(double angleDegrees);
00070 
00074         //
00080         static double angle(const geom::Coordinate& p0,
00081                             const geom::Coordinate& p1);
00082 
00086         //
00092         static double angle(const geom::Coordinate& p);
00093 
00095         //
00105         static bool isAcute(const geom::Coordinate& p0,
00106                             const geom::Coordinate& p1,
00107                             const geom::Coordinate& p2);
00108 
00110         //
00120         static bool isObtuse(const geom::Coordinate& p0,
00121                              const geom::Coordinate& p1,
00122                              const geom::Coordinate& p2);
00123 
00125         //
00133         static double angleBetween(const geom::Coordinate& tip1,
00134                                    const geom::Coordinate& tail,
00135                                    const geom::Coordinate& tip2);
00136 
00138         //
00149         static double angleBetweenOriented(const geom::Coordinate& tip1,
00150                                            const geom::Coordinate& tail,
00151                                            const geom::Coordinate& tip2);
00152 
00154         //
00166         static double interiorAngle(const geom::Coordinate& p0,
00167                                     const geom::Coordinate& p1,
00168                                     const geom::Coordinate& p2);
00169 
00179         static int getTurn(double ang1, double ang2);
00180 
00188         static double normalize(double angle);
00189 
00208         static double normalizePositive(double angle);
00209 
00210 
00212         //
00221         static double diff(double ang1, double ang2);
00222 };
00223 
00224 
00225 } // namespace geos::algorithm
00226 } // namespace geos
00227 
00228 
00229 #endif // GEOS_ALGORITHM_ANGLE_H

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