Import Geant4 9.5.0 source tree

source/externals/clhep/src/RotationL.cc

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+// -*- C++ -*-
+// ---------------------------------------------------------------------------
+//
+// This file is a part of the CLHEP - a Class Library for High Energy Physics.
+//
+// This is the implementation of methods of the HepRotation class which
+// were introduced when ZOOM PhysicsVectors was merged in, which might cause 
+// pulling in of LorentzTransformation related code units.
+//
+
+#ifdef GNUPRAGMA
+#pragma implementation
+#endif
+
+#include "CLHEP/Vector/Rotation.h"
+#include "CLHEP/Vector/LorentzRotation.h"
+
+#include <cmath>
+
+namespace CLHEP  {
+
+// ----------  distance2 and related member functions:
+//
+// WHy do we have forms for HepLorentzRotation and HepBoost but not for 
+// HepBoostX, HepBoostY, HepBoostZ?  Because the latter can be gotten by 
+// implicit conversion to HepBoost; but if we just had HepLorentzRotation 
+// then this would involve double conversion when HepBoostX was used.
+
+double HepRotation::distance2( const HepLorentzRotation & lt  ) const {
+  HepAxisAngle a; 
+  Hep3Vector   b;
+  lt.decompose(b, a);
+  double bet = b.beta();
+  double bet2 = bet*bet;
+  HepRotation r(a);
+  return bet2/(1-bet2) + distance2(r);
+}
+
+double HepRotation::distance2( const HepBoost & lt ) const {
+  return distance2( HepLorentzRotation(lt));
+}
+
+double HepRotation::howNear( const HepLorentzRotation & lt  ) const {
+  return  std::sqrt( distance2( lt ) );
+}
+
+double HepRotation::howNear( const HepBoost & lt  ) const {
+  return  std::sqrt( distance2( lt ) );
+}
+
+bool HepRotation::isNear(   const HepLorentzRotation & lt,
+                                     double epsilon) const {
+ return  distance2( lt ) <= epsilon*epsilon;
+}
+
+bool HepRotation::isNear(   const HepBoost & lt,
+                                     double epsilon) const {
+ return  distance2( lt ) <= epsilon*epsilon;
+}
+
+}  // namespace CLHEP
+