New Track Event Model: TrackFastParabolicExtrapolator.cpp Source File

00001 // $Id: TrackFastParabolicExtrapolator.cpp,v 1.1 2005/03/16 14:10:05 hernando Exp $
00002 
00003 // CLHEP
00004 #include "CLHEP/Units/PhysicalConstants.h"
00005 
00006 #include "GaudiKernel/ToolFactory.h"
00007 
00008 // local
00009 #include "TrackFastParabolicExtrapolator.h"
00010 
00011 // Needed for the creation of TrackFastParabolicExtrapolator objects.
00012 static const ToolFactory<TrackFastParabolicExtrapolator> s_factory;
00013 const IToolFactory& TrackFastParabolicExtrapolatorFactory = s_factory;
00014 
00026 // TrackFastParabolicExtrapolator constructor.
00027 TrackFastParabolicExtrapolator::TrackFastParabolicExtrapolator
00028 (const std::string& type,const std::string& name,const IInterface* parent):
00029   TrackParabolicExtrapolator(type, name, parent)
00030 {
00031   declareInterface<ITrackExtrapolator>( this );
00032 }
00033 
00034 // TrackFastParabolicExtrapolator destructor.
00035 TrackFastParabolicExtrapolator::~TrackFastParabolicExtrapolator()
00036 {
00037   
00038 }
00039 
00040 // Create the transport matrix dX/dX_0 for pState's
00041 void TrackFastParabolicExtrapolator::updateTransportMatrix( const double dz, 
00042                                                             State& )
00043 {
00044   m_F(1,3) = dz;
00045   m_F(1,5) = 0.5 * m_ax * eplus * c_light * dz * dz;
00046   m_F(2,4) = dz;
00047   m_F(3,5) = m_ax * eplus * c_light * dz;
00048 }