Geant4 Cross Reference

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Geant4/externals/clhep/src/RotationP.cc

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  1 // -*- C++ -*-
  2 // ---------------------------------------------------------------------------
  3 //
  4 // This file is a part of the CLHEP - a Class Library for High Energy Physics.
  5 //
  6 // This is the implementation of methods of the HepRotation class which
  7 // were introduced when ZOOM PhysicsVectors was merged in, other than those
  8 // involving Euler or axis/angle representations, lengthy corrections of
  9 // the rotation matrix, or I/O.
 10 //
 11 
 12 #include "CLHEP/Vector/Rotation.h"
 13 
 14 #include <cmath>
 15 
 16 
 17 namespace CLHEP  {
 18 
 19 void HepRotation::decompose(HepAxisAngle & rotation, Hep3Vector & boost)const {
 20   boost.set(0,0,0);
 21   rotation = axisAngle();
 22 }
 23 
 24 void HepRotation::decompose(Hep3Vector & boost, HepAxisAngle & rotation)const {
 25   boost.set(0,0,0);
 26   rotation = axisAngle();
 27 }
 28 
 29 double HepRotation::distance2( const HepRotation & r  ) const {
 30   double sum = rxx * r.rxx + rxy * r.rxy + rxz * r.rxz
 31                 + ryx * r.ryx + ryy * r.ryy + ryz * r.ryz
 32                 + rzx * r.rzx + rzy * r.rzy + rzz * r.rzz;
 33   double answer = 3.0 - sum;
 34   return (answer >= 0 ) ? answer : 0;
 35 }
 36 
 37 double HepRotation::howNear(   const HepRotation & r  ) const {
 38   return  std::sqrt( distance2( r ) );
 39 }
 40 
 41 bool HepRotation::isNear(   const HepRotation & r,
 42                                      double epsilon) const {
 43  return  distance2( r ) <= epsilon*epsilon;
 44 }
 45 
 46 double HepRotation::norm2() const {
 47   double answer = 3.0 - rxx - ryy - rzz;
 48   return (answer >= 0 ) ? answer : 0;
 49 }
 50 
 51 }  // namespace CLHEP
 52