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//
//
// $Id$
//
// 
// class G4TouchableHistory
//
// Class description:
//
// Object representing a touchable detector element, and its history in the
// geometrical hierarchy, including its net resultant local->global transform.

// History:
// - Created. Paul Kent, August 1996
// ----------------------------------------------------------------------
#ifndef G4TOUCHABLEHISTORY_HH
#define G4TOUCHABLEHISTORY_HH

#include "G4VTouchable.hh"

#include "G4NavigationHistory.hh"
#include "G4Allocator.hh"
#include "G4LogicalVolume.hh"
#include "G4ThreeVector.hh"
#include "G4RotationMatrix.hh"

class G4TouchableHistory : public G4VTouchable
{

 public:  // with description

  G4TouchableHistory( const G4NavigationHistory& history );
  G4TouchableHistory(); 
    // The default constructor produces a touchable-history of 
    // 'zero-depth', ie an "unphysical" and not very unusable one.
    // It is for initialisation only.  

 ~G4TouchableHistory();

  inline G4VPhysicalVolume* GetVolume( G4int depth=0 ) const;
  inline G4VSolid* GetSolid( G4int depth=0 ) const;
  const G4ThreeVector& GetTranslation( G4int depth=0 ) const;
  const G4RotationMatrix* GetRotation( G4int depth=0 ) const;

  inline G4int GetReplicaNumber( G4int depth=0 ) const;
  inline G4int GetHistoryDepth()  const;
  G4int MoveUpHistory( G4int num_levels = 1 );
    // Access methods for touchables with history

  void  UpdateYourself( G4VPhysicalVolume*   pPhysVol,
                        const G4NavigationHistory* history=0 ); 
    // Update methods for touchables with history

 public:  // without description

  inline const G4NavigationHistory* GetHistory() const;
    // Should this method be "deprecated" ?
    // it is used now in G4Navigator::LocateGlobalPointAndSetup

  inline void *operator new(size_t);
  inline void operator delete(void *aTH);
    // Override "new" and "delete" to use "G4Allocator".

 private:

  inline G4int CalculateHistoryIndex( G4int stackDepth ) const;

  G4RotationMatrix frot;
  G4ThreeVector ftlate;
  G4NavigationHistory fhistory;
};

#include "G4TouchableHistory.icc"
#endif