Import Geant4 0.0.0 source tree

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+// This code implementation is the intellectual property of
+// the RD44 GEANT4 collaboration.
+//
+// By copying, distributing or modifying the Program (or any work
+// based on the Program) you indicate your acceptance of this statement,
+// and all its terms.
+//
+// $Id: G4FastTrack.cc,v 2.3 1998/10/13 09:54:43 mora Exp $
+// GEANT4 tag $Name: geant4-00 $
+//
+//$Id:
+//---------------------------------------------------------------
+//
+//  G4FastTrack.cc
+//
+//  Description:
+//    Keeps the current track information and special features
+//    for Parameterised Simulation Models.
+//
+//  History:
+//    Oct 97: Verderi && MoraDeFreitas - First Implementation.
+//
+//---------------------------------------------------------------
+
+#include "G4ios.hh"
+#include "G4FastTrack.hh"
+#include "G4TransportationManager.hh"
+
+// -----------
+// Constructor
+// -----------
+//
+G4FastTrack::G4FastTrack(G4Envelope *anEnvelope,
+			 G4bool IsUnique) :
+  fEnvelope(anEnvelope),fEnvelopeSolid(fEnvelope->GetSolid()),
+  fIsUnique(IsUnique), fAffineTransformationDefined(false)
+{}
+
+// -----------
+// Destructor:
+// -----------
+G4FastTrack::~G4FastTrack()
+{}
+
+//------------------------------------------------------------
+// The parameterised simulation manager uses the SetCurrentTrack
+// method to setup the current G4FastTrack object 
+//------------------------------------------------------------
+void G4FastTrack::SetCurrentTrack(const G4Track& track,
+				  const G4Navigator* theNavigator) 
+{
+
+  // -- Register track pointer (used everywhere):
+  fTrack = &track;
+
+  //-----------------------------------------------------
+  // First time the track enters the volume or if the
+  // Logical Volume was placed n-Times in the geometry :
+  // 
+  // Records the Rotation+Translation for the Envelope !
+  // When the particle is inside or on the boundary, the 
+  // NavigationHistory IS UP TO DATE.
+  //------------------------------------------------------
+  if (!fAffineTransformationDefined || !fIsUnique) 
+    FRecordsAffineTransformation(theNavigator);
+  
+  //-------------------------------------------
+  // Records local position/momentum/direction
+  // of the Track.
+  // They are accessible to the user through a
+  // set of Get functions and should be useful
+  // to decide to trigger or not.
+  //-------------------------------------------
+  // -- local position:
+  fLocalTrackPosition = fAffineTransformation.
+    TransformPoint(fTrack->GetPosition());
+  // -- local momentum:
+  fLocalTrackMomentum = fAffineTransformation.
+    TransformAxis(fTrack->GetMomentum());
+  // -- local direction:
+  fLocalTrackDirection = fLocalTrackMomentum.unit();
+  // -- local polarization:
+  fLocalTrackPolarization = fAffineTransformation.
+    TransformAxis(fTrack->GetPolarization());
+}
+
+//------------------------------------
+//
+// 3D transformation of the envelope
+// This is Done only one time.
+//
+//------------------------------------
+void 
+G4FastTrack::FRecordsAffineTransformation(const G4Navigator* theNavigator)
+{
+
+  //--------------------------------------------------------
+  // Get the touchable history which represents the current
+  // volume hierachy the particle is in.
+  // Note that TouchableHistory allocated by the Navigator
+  // must be deleted by G4FastTrack.
+  //--------------------------------------------------------
+  const G4Navigator* NavigatorToUse;
+  if(theNavigator != NULL ) NavigatorToUse=theNavigator;
+  else
+    NavigatorToUse=
+      G4TransportationManager::GetTransportationManager()->
+      GetNavigatorForTracking();
+  
+  G4TouchableHistory *history =  
+    NavigatorToUse->CreateTouchableHistory();
+  
+  //-----------------------------------------------------
+  // Run accross the hierarchy to find the physical volume
+  // associated with the envelope
+  //-----------------------------------------------------
+  int depth = history->GetHistory()->GetDepth();
+  int idepth, Done = 0;
+  for (idepth = 0; idepth <= depth; idepth++) {
+    if (history->GetHistory()->GetVolume(idepth)->GetLogicalVolume() == 
+	fEnvelope) {
+      fEnvelopePhysicalVolume=history->GetHistory()->GetVolume(idepth);
+      Done = 1;
+      break;
+    }
+  }
+  //---------------------------------------------
+  //-- Verification: should be removed in future:
+  //---------------------------------------------
+  if ( !Done )
+    {
+      G4cout << "\n\nERROR !!! can't find Transform for " <<
+	fEnvelopePhysicalVolume->GetName() << "\n\n" << endl;
+    }
+  else
+    {
+      //-------------------------------------------------------
+      // Records the transformation and inverse transformation:
+      //-------------------------------------------------------
+      fAffineTransformation = history->GetHistory()->GetTransform(idepth);
+      fInverseAffineTransformation = fAffineTransformation.Inverse();
+      
+      fAffineTransformationDefined = true;
+    }
+  
+  //------------------------------------------------------
+  // Delete the TouchableHistory created by the Navigator:
+  //------------------------------------------------------
+  delete history;
+}
+
+