//
// ********************************************************************
// * DISCLAIMER                                                       *
// *                                                                  *
// * The following disclaimer summarizes all the specific disclaimers *
// * of contributors to this software. The specific disclaimers,which *
// * govern, are listed with their locations in:                      *
// *   http://cern.ch/geant4/license                                  *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.                                                             *
// *                                                                  *
// * 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 1.5 2002/07/23 08:50:35 gcosmo Exp $
// GEANT4 tag $Name: geant4-05-00 $
//
// 
// class G4NormalNavigation
//
// Class description:
//
// Utility for navigation in volumes containing only G4PVPlacement
// daughter volumes.

// History:
// - Created. 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:  // with description

    G4bool LevelLocate( G4NavigationHistory &history,
                  const G4VPhysicalVolume *blockedVol,
                  const G4int blockedNum,
                  const G4ThreeVector &globalPoint,
                  const G4ThreeVector* globalDirection,
                  const G4bool pLocatedOnEdge, 
                        G4ThreeVector &localPoint);
      // 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.

    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