GEOS 3.3.1
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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