BoostX.icc

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// -*- 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
// HepBoostX class
//

#include <cmath>

namespace CLHEP  {

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

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

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

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

inline HepBoostX::HepBoostX(double bbeta) { set(bbeta); }

// - Protected method:
inline HepBoostX::HepBoostX( double bbeta, double ggamma ) :
                                        beta_(bbeta), gamma_(ggamma) {}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

inline double HepBoostX::norm2() const {
  double bg = beta_*gamma_;
  return bg*bg;
}

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

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

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

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

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

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

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

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

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

}  // namespace CLHEP