// This code implementation is the intellectual property of
// the 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: G4NormalNavigation.hh,v 1.1.10.1 1999/12/07 20:48:40 gunter Exp $
// GEANT4 tag $Name: geant4-01-00 $
//
// 
// class G4NormalNavigation: Utility for navigation in volumes
// containing only G4PVPlacement daughter volumes. Paul Kent Aug 96

#ifndef G4NORMALNAVIGATION_HH
#define G4NORMALNAVIGATION_HH

#include "geomdefs.hh"
#include "G4NavigationHistory.hh"
#include "G4AffineTransform.hh"
#include "G4VPhysicalVolume.hh"
#include "G4LogicalVolume.hh"
#include "G4VSolid.hh"
#include "G4ThreeVector.hh"

class G4NormalNavigation
{
public:

// Search positioned volumes in mother at current top level of history for
// volume containing globalPoint. Do not test the blocked volume. If a
// containing volume is found, `stack' the new volume and return true,
// else return false (the point lying in the mother but not any of the
// daughters). localPoint = global point in local system on entry,
// point in new system on exit.
	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 &localPoint,
			     const G4ThreeVector &localDirection,
			     const G4double currentProposedStepLength,
			     G4double &newSafety,
			     G4NavigationHistory &history,
			     G4bool &validExitNormal,
			     G4ThreeVector &exitNormal,
			     G4bool &exiting,
			     G4bool &entering,
                             G4VPhysicalVolume *(*pBlockedPhysical),
                             G4int &blockedReplicaNo);

        G4double ComputeSafety(const G4ThreeVector &globalpoint,
			       const G4NavigationHistory &history,
    		               const G4double pMaxLength=DBL_MAX );
};

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

#include "G4NormalNavigation.icc"

#endif