//
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// $Id: G4VGraphicsSystem.hh,v 1.10 2003/06/16 17:14:07 gunter Exp $
// GEANT4 tag $Name: geant4-05-02-patch-01 $
//
// 
// John Allison  27th March 1996
//
// Class description
//
// Abstract interface class for graphics systems.

#ifndef G4VGRAPHICSSYSTEM_HH
#define G4VGRAPHICSSYSTEM_HH

#include "globals.hh"

class G4VSceneHandler;
class G4VViewer;

class G4VGraphicsSystem {

public: // With description

  enum Functionality {
    noFunctionality,
    nonEuclidian,       // e.g., tree representation of geometry hierarchy.
    twoD,               // Simple 2D, e.g., X (no stored structures).
    twoDStore,          // 2D with stored structures.
    threeD,             // Passive 3D (with stored structures).
    threeDInteractive,  // 3D with "pick" functionality.
    virtualReality      // Virtual Reality functionality.
  };

  G4VGraphicsSystem (const G4String& name,
		     Functionality f);

  G4VGraphicsSystem (const G4String& name,
		     const G4String& nickname,
		     Functionality f);

  G4VGraphicsSystem (const G4String& name,
		     const G4String& nickname,
		     const G4String& description,
		     Functionality f);

  virtual ~G4VGraphicsSystem ();

  virtual G4VSceneHandler* CreateSceneHandler (const G4String& name) = 0;

  virtual G4VViewer* CreateViewer (G4VSceneHandler&, const G4String& name) = 0;

  // Access functions.
  const G4String& GetName          () const;
  const G4String& GetNickname      () const;
  const G4String& GetDescription   () const;
  Functionality   GetFunctionality () const;

protected:
  const G4String fName;
  const G4String fNickname;
  const G4String fDescription;
  Functionality  fFunctionality;
};

std::ostream& operator << (std::ostream& os, const G4VGraphicsSystem& gs);

#include "G4VGraphicsSystem.icc"

#endif