// 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: G4ParameterisedNavigation.hh,v 2.2 1998/11/02 12:11:56 japost Exp $
// GEANT4 tag $Name: geant4-00 $
//
// 
// class G4ParameterisedNavigation: Utility for navigation in volumes
// containing a single G4PVParameterised volume for which voxels for
// the replicated volumes have been constructed.
// [Voxels MUST be along one axis only: NOT refined] Paul Kent Aug 96

#ifndef G4PARAMETERISEDNAVIGATION_HH
#define G4PARAMETERISEDNAVIGATION_HH

#include "globals.hh"
#include "G4NavigationHistory.hh"
#include "G4AffineTransform.hh"
#include "G4VPhysicalVolume.hh"
#include "G4VPVParameterisation.hh"
#include "G4LogicalVolume.hh"
#include "G4VSolid.hh"
#include "G4ThreeVector.hh"

#include "G4BlockingList.hh"

// Required for voxel handling
#include "G4SmartVoxelProxy.hh"
#include "G4SmartVoxelNode.hh"
#include "G4SmartVoxelHeader.hh"

class G4ParameterisedNavigation
{
public:
	G4ParameterisedNavigation();
        ~G4ParameterisedNavigation();
	G4SmartVoxelNode* VoxelLocate(G4SmartVoxelHeader *pHead,
                           const G4ThreeVector &localPoint);
	G4bool LevelLocate(G4NavigationHistory& history,
			   const G4VPhysicalVolume *blockedVol,
                           const G4int blockedNum,
                           const G4ThreeVector &globalPoint,
                           const G4ThreeVector* globalDirection,
			   const G4bool pLocatedOnEdge, 
			   G4ThreeVector &localPoint);
	G4double ComputeStep(const G4ThreeVector &globalPoint,
			     const G4ThreeVector &globalDirection,
			     const G4double currentProposedStepLength,
			     G4double &newSafety,
			     G4NavigationHistory &history,
			     G4bool &validExitNormal,
			     G4ThreeVector &exitNormal,
			     G4bool &exiting,
			     G4bool &entering,
                             G4VPhysicalVolume *(*pBlockedPhysical),
                             G4int &blockedReplicaNo);
        G4double ComputeSafety(const G4ThreeVector &localPoint,
		               const  G4NavigationHistory &history,
		               const G4double pProposedMaxLength=DBL_MAX );
private:
	G4double ComputeVoxelSafety(const G4ThreeVector &localPoint) const;
	G4bool LocateNextVoxel(const G4ThreeVector &localPoint,
			const G4ThreeVector& localDirection,
		        const G4double currentStep);

    G4BlockingList fBList;	// Blocked volumes
//
//  BEGIN Voxel Stack information
//
    EAxis fVoxelAxis;
    G4int fVoxelNoSlices;
    G4double fVoxelSliceWidth; 
    G4int fVoxelNodeNo;	  
    G4SmartVoxelHeader *fVoxelHeader;
    G4SmartVoxelNode *fVoxelNode;
//
//  END Voxel Stack information
//

};

#include "G4AuxiliaryNavServices.hh"    // Needed for inline methods

#include "G4ParameterisedNavigation.icc"

#endif