//
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//
// $Id: G4VoxelNavigation.hh,v 1.11 2002/07/23 08:50:37 gcosmo Exp $
// GEANT4 tag $Name: geant4-05-01 $
//
// 
// class G4VoxelNavigation
//
// Class description:
//
// Utility for navigation in volumes containing only G4PVPlacement
// daughter volumes for which voxels have been constructed.

// History:
// - Created. Paul Kent, Aug 96
// ********************************************************************

#ifndef G4VOXELNAVIGATION_HH
#define G4VOXELNAVIGATION_HH

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

#include "G4BlockingList.hh"

// Required for inline implementation
//
#include "G4AuxiliaryNavServices.hh"

// Required for voxel handling & voxel stack
//
#include "g4std/vector"
#include "G4SmartVoxelProxy.hh"
#include "G4SmartVoxelNode.hh"
#include "G4SmartVoxelHeader.hh"

class G4VoxelNavigation
{
  public:  // with description

    G4VoxelNavigation();
    virtual ~G4VoxelNavigation();

    G4SmartVoxelNode* VoxelLocate( G4SmartVoxelHeader* pHead,
                             const G4ThreeVector& localPoint );

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

    virtual 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 );

    virtual G4double ComputeSafety( const G4ThreeVector& globalpoint,
                                    const G4NavigationHistory& history,
                                    const G4double pMaxLength=DBL_MAX );
  protected:

    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
    //

    G4int fVoxelDepth;
      // Note: fVoxelDepth==0+ => fVoxelAxisStack(0+) contains axes of voxel
      //       fVoxelDepth==-1 -> not in voxel

    G4std::vector<EAxis> fVoxelAxisStack;
      // Voxel axes

    G4std::vector<G4int> fVoxelNoSlicesStack;
      // No slices per voxel at each level

    G4std::vector<G4double> fVoxelSliceWidthStack; 
      // Width of voxels at each level 

    G4std::vector<G4int> fVoxelNodeNoStack;    
      // Node no point is inside at each level 

    G4std::vector<G4SmartVoxelHeader*> fVoxelHeaderStack;
      // Voxel headers at each level

    G4SmartVoxelNode* fVoxelNode;
      // Node containing last located point

    //
    //  END Voxel Stack information
    //

};

#include "G4VoxelNavigation.icc"

#endif