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// $Id: G4NormalNavigation.hh,v 1.4 2006/06/29 18:36:06 gunter Exp $
// GEANT4 tag $Name: geant4-09-02-cand-01 $
//
// 
// 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 "G4NavigationHistory.hh"
#include "G4VPhysicalVolume.hh"
#include "G4LogicalVolume.hh"
#include "G4VSolid.hh"
#include "G4ThreeVector.hh"
#include "G4AuxiliaryNavServices.hh"    // Needed for inline methods

class G4NormalNavigation
{
  public:  // with description

    G4NormalNavigation();
      // Constructor

    ~G4NormalNavigation();
      // Destructor

    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 );

    inline G4int GetVerboseLevel();
    inline void  SetVerboseLevel(G4int level);
      // Get/Set Verbose(ness) level.
      // [if level>0 && G4VERBOSE, printout can occur]

    inline void  CheckMode(G4bool mode);
      // Run navigation in "check-mode", therefore using additional
      // verifications and more strict correctness conditions.
      // Is effective only with G4VERBOSE set.

  private:

    G4bool fCheck; 
    G4int  fVerbose; 
};

#include "G4NormalNavigation.icc"

#endif
