source: trunk/CLHEP/Vector/BoostY.icc@ 4

// -*- C++ -*-
// ---------------------------------------------------------------------------
//
// This file is a part of the CLHEP - a Class Library for High Energy Physics.
// 
// This is the definitions of the inline member functions of the
// HepBoostY class
//

#include <cmath>

namespace CLHEP  {

// ----------  Constructors and Assignment:

inline HepBoostY::HepBoostY() : beta_(0.0), gamma_(1.0) {}

inline HepBoostY::HepBoostY(const HepBoostY & b) : 
        beta_ (b.beta_), 
        gamma_(b.gamma_) {}

inline HepBoostY & HepBoostY::operator = (const HepBoostY & b) { 
  beta_  = b.beta_; 
  gamma_ = b.gamma_;
  return *this;
}

inline HepBoostY::HepBoostY(double beta) { set(beta); }

// - Protected method:
inline HepBoostY::HepBoostY( double beta, double gamma ) :
                                        beta_(beta), gamma_(gamma) {}

// ----------  Accessors:

inline double  HepBoostY::beta() const {   
  return beta_;
}

inline double  HepBoostY::gamma() const {
  return gamma_;
}

inline Hep3Vector HepBoostY::boostVector() const { 
  return  Hep3Vector( 0, beta_, 0 );
}

inline Hep3Vector HepBoostY::getDirection() const { 
  return  Hep3Vector( 0.0, 1.0, 0.0 );
}

inline double HepBoostY::xx() const { return 1.0;}
inline double HepBoostY::xy() const { return 0.0;}
inline double HepBoostY::xz() const { return 0.0;}
inline double HepBoostY::xt() const { return 0.0;}
inline double HepBoostY::yx() const { return 0.0;}
inline double HepBoostY::yy() const { return gamma();}
inline double HepBoostY::yz() const { return 0.0;}
inline double HepBoostY::yt() const { return beta()*gamma();}
inline double HepBoostY::zx() const { return 0.0;}
inline double HepBoostY::zy() const { return 0.0;}
inline double HepBoostY::zz() const { return 1.0;}
inline double HepBoostY::zt() const { return 0.0;}
inline double HepBoostY::tx() const { return 0.0;}
inline double HepBoostY::ty() const { return beta()*gamma();}
inline double HepBoostY::tz() const { return 0.0;}
inline double HepBoostY::tt() const { return gamma();}

inline HepLorentzVector HepBoostY::col1() const {
  return HepLorentzVector ( 1, 0, 0, 0 );
}
inline HepLorentzVector HepBoostY::col2() const {
  return HepLorentzVector ( 0, gamma(), 0, beta()*gamma() );
}
inline HepLorentzVector HepBoostY::col3() const {
  return HepLorentzVector ( 0, 0, 1, 0 );
}
inline HepLorentzVector HepBoostY::col4() const {
  return HepLorentzVector ( 0, beta()*gamma(), 0, gamma() );
}

inline HepLorentzVector HepBoostY::row1() const {
  return HepLorentzVector ( col1() );
}
inline HepLorentzVector HepBoostY::row2() const {
  return HepLorentzVector ( col2() );
}
inline HepLorentzVector HepBoostY::row3() const {
  return HepLorentzVector ( col3() );
}
inline HepLorentzVector HepBoostY::row4() const {
  return HepLorentzVector ( col4() );
}

// ----------  Comparisons:

inline int HepBoostY::compare( const HepBoostY & b ) const {
  if (beta() < b.beta()) {
    return -1;
  } else if (beta() > b.beta()) {
    return 1;
  } else {
    return 0;
  }
}

inline bool HepBoostY::operator == ( const HepBoostY & b ) const {
  return beta_ == b.beta_;
}
inline bool HepBoostY::operator != ( const HepBoostY & b ) const {
  return beta_ != b.beta_;
}
inline bool HepBoostY::operator <= ( const HepBoostY & b ) const {
  return beta_ <= b.beta_;
}
inline bool HepBoostY::operator >= ( const HepBoostY & b ) const {
  return beta_ >= b.beta_;
}
inline bool HepBoostY::operator <  ( const HepBoostY & b ) const {
  return beta_ <  b.beta_;
}
inline bool HepBoostY::operator >  ( const HepBoostY & b ) const {
  return beta_ >  b.beta_;
}


inline bool HepBoostY::isIdentity() const {
  return ( beta() == 0 );
}

inline double HepBoostY::distance2( const HepBoostY & b ) const {
  double d = beta()*gamma() - b.beta()*b.gamma();
  return d*d;
}

inline double HepBoostY::howNear(const HepBoostY & b) const {
  return std::sqrt(distance2(b)); }
inline double HepBoostY::howNear(const HepBoost  & b) const {
  return std::sqrt(distance2(b)); }
inline double HepBoostY::howNear(const HepRotation & r) const {
  return std::sqrt(distance2(r)); }
inline double HepBoostY::howNear(const HepLorentzRotation & lt) const {
  return std::sqrt(distance2(lt)); }

inline bool HepBoostY::isNear(const HepBoostY & b,
                                        double epsilon) const {
  return (distance2(b) <= epsilon*epsilon);
}
inline bool HepBoostY::isNear(const HepBoost & b,
                                        double epsilon) const {
  return (distance2(b) <= epsilon*epsilon);
}

// ----------  Properties:

double HepBoostY::norm2() const {
  register double bg = beta_*gamma_;
  return bg*bg;
}

// ---------- Application:

inline HepLorentzVector
HepBoostY::operator * (const HepLorentzVector & p) const {
  double bg = beta_*gamma_;
  return HepLorentzVector(       p.x(),
                          gamma_*p.y() + bg*p.t(),
                                 p.z(),
                          gamma_*p.t() + bg*p.y());
}

HepLorentzVector HepBoostY::operator() (const HepLorentzVector & w) const {
  return operator*(w);
}

// ---------- Operations in the group of 4-Rotations

inline HepBoostY HepBoostY::inverse() const {
  return HepBoostY( -beta(), gamma() );
}

inline HepBoostY inverseOf ( const HepBoostY & b ) {
  return HepBoostY( -b.beta(), b.gamma());
}

inline HepBoostY & HepBoostY::invert() {
  beta_ = -beta_;
  return *this;
}

// ---------- Tolerance:

inline double HepBoostY::getTolerance() {
  return Hep4RotationInterface::tolerance;
}
inline double HepBoostY::setTolerance(double tol) {
  return Hep4RotationInterface::setTolerance(tol);
}

}  // namespace CLHEP