00001 //----------------------------------------------------------------------------- 00002 // $Id: TPoint2D.h,v 1.6 2010/03/31 09:58:59 liucy Exp $ 00003 //----------------------------------------------------------------------------- 00004 // Filename : TPoint2D.h 00005 // Section : Tracking 00006 // Owner : Yoshi Iwasaki 00007 // Email : yoshihito.iwasaki@kek.jp 00008 //----------------------------------------------------------------------------- 00009 // Description : A class to represent a point in 2D. 00010 // See http://bsunsrv1.kek.jp/~yiwasaki/tracking/ 00011 //----------------------------------------------------------------------------- 00012 00013 #ifndef TPOINT2D_FLAG_ 00014 #define TPOINT2D_FLAG_ 00015 00016 #ifdef TRKRECO_DEBUG_DETAIL 00017 #ifndef TRKRECO_DEBUG 00018 #define TRKRECO_DEBUG 00019 #endif 00020 #endif 00021 #include <math.h> 00022 #define HEP_SHORT_NAMES 00023 #include "CLHEP/Geometry/Vector3D.h" 00024 #ifndef ENABLE_BACKWARDS_COMPATIBILITY 00025 typedef HepGeom::Vector3D<double> HepVector3D; 00026 #endif 00027 #ifndef CLHEP_POINT3D_H 00028 #include "CLHEP/Geometry/Point3D.h" 00029 #endif 00030 #ifndef ENABLE_BACKWARDS_COMPATIBILITY 00031 typedef HepGeom::Point3D<double> HepPoint3D; 00032 #endif 00033 00034 //class HepPoint3D; 00035 00037 class TPoint2D { 00038 00039 public: 00041 TPoint2D(); 00042 TPoint2D(double, double); 00043 TPoint2D(const HepPoint3D &); 00044 TPoint2D(const HepVector3D &); 00045 00047 virtual ~TPoint2D(); 00048 00049 public:// Selectors 00050 double x(void) const; 00051 double y(void) const; 00052 double mag(void) const; 00053 double mag2(void) const; 00054 double phi(void) const; 00055 00056 public:// Modifiers 00057 double x(double); 00058 double y(double); 00059 00060 public:// Operators 00061 double dot(const TPoint2D &) const; 00062 double cross(const TPoint2D &) const; 00063 TPoint2D unit(void) const; 00064 TPoint2D operator + (const TPoint2D &) const; 00065 TPoint2D operator - (const TPoint2D &) const; 00066 TPoint2D operator - () const; 00067 bool operator == (const TPoint2D &) const; 00068 00069 private: 00070 double _p[2]; 00071 }; 00072 00073 std::ostream & 00074 operator << (std::ostream &, const TPoint2D &); 00075 00076 //----------------------------------------------------------------------------- 00077 00078 #ifdef TPOINT2D_NO_INLINE 00079 #define inline 00080 #else 00081 #undef inline 00082 #define TPOINT2D_INLINE_DEFINE_HERE 00083 #endif 00084 #ifdef TPOINT2D_INLINE_DEFINE_HERE 00085 00086 inline 00087 double 00088 TPoint2D::x(void) const { 00089 return _p[0]; 00090 } 00091 00092 inline 00093 double 00094 TPoint2D::y(void) const { 00095 return _p[1]; 00096 } 00097 00098 inline 00099 double 00100 TPoint2D::x(double a) { 00101 return _p[0] = a; 00102 } 00103 00104 inline 00105 double 00106 TPoint2D::y(double a) { 00107 return _p[1] = a; 00108 } 00109 00110 inline 00111 double 00112 TPoint2D::mag(void) const { 00113 return sqrt(_p[0] * _p[0] + _p[1] * _p[1]); 00114 } 00115 00116 inline 00117 double 00118 TPoint2D::mag2(void) const { 00119 return _p[0] * _p[0] + _p[1] * _p[1]; 00120 } 00121 00122 inline 00123 double 00124 TPoint2D::phi(void) const { 00125 if (_p[0] == 0.0 && _p[1] == 0.0) return 0.; 00126 double a = atan2(_p[1], _p[0]); 00127 if (a > 0) return a; 00128 return a + 2. * M_PI; 00129 } 00130 00131 inline 00132 double 00133 TPoint2D::dot(const TPoint2D & a) const { 00134 return _p[0] * a.x() + _p[1] * a.y(); 00135 } 00136 00137 inline 00138 double 00139 TPoint2D::cross(const TPoint2D & a) const { 00140 return _p[0] * a.y() - a.x() * _p[1]; 00141 } 00142 00143 inline 00144 TPoint2D 00145 TPoint2D::operator + (const TPoint2D & a) const { 00146 return TPoint2D(_p[0] + a.x(), _p[1] + a.y()); 00147 } 00148 00149 inline 00150 TPoint2D 00151 TPoint2D::operator - (const TPoint2D & a) const { 00152 return TPoint2D(_p[0] - a.x(), _p[1] - a.y()); 00153 } 00154 00155 inline 00156 TPoint2D 00157 TPoint2D::operator - () const { 00158 return TPoint2D(- _p[0], - _p[1]); 00159 } 00160 00161 inline 00162 bool 00163 TPoint2D::operator == (const TPoint2D & a) const { 00164 if (a.x() == _p[0] && a.y() == _p[1]) return true; 00165 return false; 00166 } 00167 00168 inline 00169 TPoint2D 00170 TPoint2D::unit(void) const { 00171 double sum2 = _p[0] * _p[0] + _p[1] * _p[1]; 00172 if (sum2 == 0.) return TPoint2D(0., 0.); 00173 double sum = sqrt(sum2); 00174 return TPoint2D(_p[0] / sum, _p[1] / sum); 00175 } 00176 00177 #endif 00178 #undef inline 00179 00180 #endif /* TPOINT2D_FLAG_ */
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