[1] | 1 | ////////////////////////////////////////////////////////////////////////// |
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| 2 | // SimpleVector.icc |
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| 3 | ////////////////////////////////////////////////////////////////////////// |
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| 4 | |
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| 5 | ////////////////////////////////////////////////////////////////////////// |
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| 6 | // garren@fnal.gov, July 2006 |
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| 7 | // |
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| 8 | // |
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| 9 | ////////////////////////////////////////////////////////////////////////// |
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| 10 | |
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| 11 | #include <cmath> |
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| 12 | #include <algorithm> // for swap |
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| 13 | |
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| 14 | namespace HepMC { |
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| 15 | |
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| 16 | ////////////////////////////////////////////////////////////////////////// |
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| 17 | // FourVector inline methods |
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| 18 | ////////////////////////////////////////////////////////////////////////// |
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| 19 | |
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| 20 | inline void FourVector::swap( FourVector & other ) { |
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| 21 | std::swap( m_x, other.m_x ); |
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| 22 | std::swap( m_y, other.m_y ); |
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| 23 | std::swap( m_z, other.m_z ); |
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| 24 | std::swap( m_t, other.m_t ); |
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| 25 | } |
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| 26 | |
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| 27 | inline FourVector & FourVector::operator=(const FourVector & v) { |
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| 28 | m_x = v.x(); |
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| 29 | m_y = v.y(); |
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| 30 | m_z = v.z(); |
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| 31 | m_t = v.t(); |
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| 32 | return *this; |
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| 33 | } |
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| 34 | |
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| 35 | inline void FourVector::set(double xin, double yin, double zin, double tin) { |
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| 36 | m_x = xin; |
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| 37 | m_y = yin; |
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| 38 | m_z = zin; |
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| 39 | m_t = tin; |
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| 40 | } |
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| 41 | |
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| 42 | inline double FourVector::m2() const { |
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| 43 | return m_t*m_t - (m_x*m_x + m_y*m_y + m_z*m_z); |
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| 44 | } |
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| 45 | |
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| 46 | inline double FourVector::m() const { |
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| 47 | double mm = m2(); |
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| 48 | return mm < 0.0 ? -std::sqrt(-mm) : std::sqrt(mm); |
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| 49 | } |
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| 50 | |
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| 51 | inline double FourVector::perp2() const { return m_x*m_x + m_y*m_y; } |
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| 52 | |
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| 53 | inline double FourVector::perp() const { return std::sqrt(perp2()); } |
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| 54 | |
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| 55 | inline double FourVector::theta() const { |
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| 56 | return m_x == 0.0 && m_y == 0.0 && m_z == 0.0 ? 0.0 : std::atan2(perp(),m_z); |
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| 57 | } |
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| 58 | |
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| 59 | inline double FourVector::phi() const { |
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| 60 | return m_x == 0.0 && m_y == 0.0 ? 0.0 : std::atan2(m_y,m_x); |
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| 61 | } |
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| 62 | |
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| 63 | inline double FourVector::rho() const { |
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| 64 | return std::sqrt( m_x*m_x + m_y*m_y + m_z*m_z ); |
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| 65 | } |
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| 66 | |
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| 67 | inline bool FourVector::operator == (const FourVector & v) const { |
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| 68 | return (v.x()==x() && v.y()==y() && v.z()==z() && v.t()==t()) ? true : false; |
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| 69 | } |
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| 70 | |
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| 71 | inline bool FourVector::operator != (const FourVector & v) const { |
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| 72 | return (v.x()!=x() || v.y()!=y() || v.z()!=z() || v.t()!=t()) ? true : false; |
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| 73 | } |
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| 74 | |
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| 75 | inline double FourVector::pseudoRapidity() const { |
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| 76 | double m1 = std::sqrt( m_x*m_x + m_y*m_y + m_z*m_z ); |
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| 77 | if ( m1== 0 ) return 0.0; |
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| 78 | if ( m1== z() ) return 1.0E72; |
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| 79 | if ( m1== -z() ) return -1.0E72; |
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| 80 | return 0.5*log( (m1+z())/(m1-z()) ); |
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| 81 | } |
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| 82 | |
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| 83 | inline double FourVector::eta() const { return pseudoRapidity();} |
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| 84 | |
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| 85 | |
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| 86 | ////////////////////////////////////////////////////////////////////////// |
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| 87 | // ThreeVector inline methods |
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| 88 | ////////////////////////////////////////////////////////////////////////// |
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| 89 | |
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| 90 | inline void ThreeVector::swap( ThreeVector & other ) { |
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| 91 | std::swap( m_x, other.m_x ); |
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| 92 | std::swap( m_y, other.m_y ); |
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| 93 | std::swap( m_z, other.m_z ); |
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| 94 | } |
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| 95 | |
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| 96 | inline double ThreeVector::theta() const { |
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| 97 | return m_x == 0.0 && m_y == 0.0 && m_z == 0.0 ? 0.0 : std::atan2(perp(),m_z); |
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| 98 | } |
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| 99 | |
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| 100 | inline double ThreeVector::phi() const { |
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| 101 | return m_x == 0.0 && m_y == 0.0 ? 0.0 : std::atan2(m_y,m_x); |
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| 102 | } |
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| 103 | |
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| 104 | inline double ThreeVector::r() const { |
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| 105 | return std::sqrt( m_x*m_x + m_y*m_y + m_z*m_z ); |
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| 106 | } |
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| 107 | |
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| 108 | inline void ThreeVector::set(double xin, double yin, double zin) { |
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| 109 | m_x = xin; |
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| 110 | m_y = yin; |
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| 111 | m_z = zin; |
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| 112 | } |
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| 113 | |
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| 114 | inline void ThreeVector::setPhi(double ph) { |
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| 115 | double xy = perp(); |
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| 116 | setX(xy*std::cos(ph)); |
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| 117 | setY(xy*std::sin(ph)); |
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| 118 | } |
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| 119 | |
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| 120 | inline void ThreeVector::setTheta(double th) { |
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| 121 | double ma = r(); |
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| 122 | double ph = phi(); |
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| 123 | setX(ma*std::sin(th)*std::cos(ph)); |
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| 124 | setY(ma*std::sin(th)*std::sin(ph)); |
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| 125 | setZ(ma*std::cos(th)); |
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| 126 | } |
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| 127 | |
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| 128 | inline double ThreeVector::perp2() const { return m_x*m_x + m_y*m_y; } |
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| 129 | |
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| 130 | inline double ThreeVector::perp() const { return std::sqrt(perp2()); } |
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| 131 | |
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| 132 | inline ThreeVector & ThreeVector::operator = (const ThreeVector & p) { |
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| 133 | m_x = p.x(); |
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| 134 | m_y = p.y(); |
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| 135 | m_z = p.z(); |
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| 136 | return *this; |
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| 137 | } |
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| 138 | |
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| 139 | |
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| 140 | inline bool ThreeVector::operator == (const ThreeVector& v) const { |
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| 141 | return (v.x()==x() && v.y()==y() && v.z()==z()) ? true : false; |
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| 142 | } |
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| 143 | |
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| 144 | inline bool ThreeVector::operator != (const ThreeVector& v) const { |
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| 145 | return (v.x()!=x() || v.y()!=y() || v.z()!=z()) ? true : false; |
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| 146 | } |
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| 147 | |
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| 148 | } // HepMC |
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