G4MultiLevelLocator.hh

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00026 //
00027 // $Id$
00028 //
00029 //
00030 // Class G4MultiLevelLocator 
00031 //
00032 // class description:
00033 // 
00034 // Implementing the calculation of the intersection point with a boundary when
00035 // PropagationInField is used. Derived from method LocateIntersectionPoint()
00036 // from G4PropagatorInField, it is based on a linear method for finding the
00037 // intersection point by means of a 'depth' algorithm in case of slow progress
00038 // (intersection is not found after 100 trials).
00039 
00040 // History:
00041 // -------
00042 // 27.10.08 - Tatiana Nikitina: Derived from LocateIntersectionPoint() from 
00043 //                              G4PropagatorInField class
00044 // ---------------------------------------------------------------------------
00045 
00046 #ifndef G4MULTILEVELLOCATOR_HH
00047 #define G4MULTILEVELLOCATOR_HH
00048 
00049 #include "G4VIntersectionLocator.hh"
00050 
00051 class G4MultiLevelLocator : public G4VIntersectionLocator
00052 {
00053    public:  // with description 
00054  
00055      G4MultiLevelLocator(G4Navigator *theNavigator);
00056         // Constructor
00057      ~G4MultiLevelLocator();
00058         // Default destructor
00059      
00060      G4bool EstimateIntersectionPoint( 
00061          const  G4FieldTrack&       curveStartPointTangent,  // A
00062          const  G4FieldTrack&       curveEndPointTangent,    // B
00063          const  G4ThreeVector&      trialPoint,              // E
00064                 G4FieldTrack&       intersectPointTangent,   // Output
00065                 G4bool&             recalculatedEndPoint,    // Out
00066                 G4double&           fPreviousSafety,         // In/Out
00067                 G4ThreeVector&      fPreviousSftOrigin);     // In/Out
00068       // If such an intersection exists, this function calculates the
00069       // intersection point of the true path of the particle with the surface
00070       // of the current volume (or of one of its daughters). 
00071       // Should use lateral displacement as measure of convergence
00072 
00073    private:
00074 
00075      static const G4int max_depth=10;
00076 
00077      G4FieldTrack* ptrInterMedFT[max_depth+1];
00078        // Used to store intermediate tracks values in case of too slow progress
00079 };
00080 
00081 #endif

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