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//
// $Id$
//
// 
// John Allison  5th April 2001
// A base class for a scene handler to dump geometry hierarchy.
// In the derived class, override G4VScenehandler::RequestPrimitives
// to implement dump of the geometry hierarchy.

#ifndef G4VTREESCENEHANDLER_HH
#define G4VTREESCENEHANDLER_HH

#include "G4VSceneHandler.hh"

#include "G4PhysicalVolumeModel.hh"
#include <vector>
#include <set>

class G4VPhysicalVolume;
class G4LogicalVolume;
class G4ModelingParameters;

class G4VTreeSceneHandler: public G4VSceneHandler {

public:
  G4VTreeSceneHandler(G4VGraphicsSystem& system,
		      const G4String& name);
  virtual ~G4VTreeSceneHandler ();
  void PreAddSolid (const G4Transform3D& objectTransformation,
		   const G4VisAttributes&);
  void PostAddSolid ();

  ////////////////////////////////////////////////////////////////
  // Functions not used but required by the abstract interface.

  virtual void AddPrimitive (const G4Polyline&)   {}
  virtual void AddPrimitive (const G4Text&)       {}
  virtual void AddPrimitive (const G4Circle&)     {}
  virtual void AddPrimitive (const G4Square&)     {}
  virtual void AddPrimitive (const G4Polyhedron&) {}
  virtual void AddPrimitive (const G4NURBS&)      {}
  virtual void AddPrimitive (const G4Polymarker&) {}
  virtual void AddPrimitive (const G4Scale&)      {}

  virtual void BeginModeling();
  virtual void EndModeling();

protected:

  // In the derived class, override G4VScenehandler::RequestPrimitives
  // to implement dump of the geometry hierarchy.
  static G4int         fSceneIdCount;  // Counter for Tree scene handlers.
  const G4Transform3D* fpCurrentObjectTransformation;
  std::set<G4LogicalVolume*> fDrawnLVStore;  // Stores encountered LVs.
};

#include "G4VTreeSceneHandler.icc"

#endif