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 //
 // ********************************************************************
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 // * The  Geant4 software  is  copyright of the Copyright Holders  of *
 // * the Geant4 Collaboration.  It is provided  under  the terms  and *
 // * conditions of the Geant4 Software License,  included in the file *
 // * LICENSE and available at  http://cern.ch/geant4/license .  These *
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 // * work  make  any representation or  warranty, express or implied, *
 // * regarding  this  software system or assume any liability for its *
 // * use.  Please see the license in the file  LICENSE  and URL above *
 // * for the full disclaimer and the limitation of liability.         *
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 // * This  code  implementation is the result of  the  scientific and *
 // * technical work of the GEANT4 collaboration.                      *
 // * By using,  copying,  modifying or  distributing the software (or *
 // * any work based  on the software)  you  agree  to acknowledge its *
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 // ********************************************************************
 //
 //
 // John Allison 19/Oct/1996.
 // 
 // Class Description:
 //
 // G4VVisManager is an abstract interface for the GEANT4 Visualization Manager.
 // The inheritance hierarchy is:
 //   G4VVisManager <- G4VisManager <- G4VisExecutive
 //
 // You may also write your own vis manager in place of G4VisExecutive.
 //
 // See example/novice/N02 to see how and when to instantiate
 // G4VisExecutive (or your own vis manager).  You should *not* access
 // it directly; instead you should obtain a pointer as follows:
 // 
 //   G4VVisManager* pVVMan =  G4VVisManager::GetConcreteInstance ();
 //
 // This ensures your code will link even if G4VisExecutive is not
 // instantiated or even if not provided in a library.  Please protect
 // your code by testing the pointer, for example, by:
 //
 //   if (pVVMan) pVVMan -> Draw (polyline);
 //
 // The Draw functions draw only "transient" objects.  This is useful
 // for debugging, e.g., drawing the step in your UserSteppingAction,
 // since G4Steps are not kept.
 //
 // Note: "permanent" objects, i.e., objects which are always
 // available, such as detector geometry components, or available in an
 // event after tracking has finished, such as hits, digitisations and
 // trajectories, can be drawn in a transient way if you wish but it is
 // usually possible to draw them in a permanent way with /vis/
 // commands.  The advantage is that permanent objects can be redrawn,
 // e.g., when you change view or viewer; transient objects get
 // forgotten.  Also, it is possible to write a G4VUserVisAction class
 // and register it to "promote" your Draw messages to "permanent" -
 // see documentation.
 //
 // Note that the G4Transform3D argument refers to the transformation
 // of the *object*, not the transformation of the coordinate syste.
 //
 // Note also that where a G4VisAttributes argument is specified, it
 // overrides any attributes belonging to the object itself.
 
 #ifndef G4VVISMANAGER_HH
 #define G4VVISMANAGER_HH
 
 #include "G4Transform3D.hh"
 #include "G4ThreeVector.hh"       // Just a typedef Hep3Vector.
 #include "G4RotationMatrix.hh"    // Just a typedef HepRotation.
 
 class G4Polyline;
 class G4Text;
 class G4Circle;
 class G4Square;
 class G4Polymarker;
 class G4Polyhedron;
 class G4VSolid;
 class G4VHit;
 class G4VDigi;
 class G4VTrajectory;
 class G4LogicalVolume;
 class G4VPhysicalVolume;
 class G4VisAttributes;
 
 class G4VVisManager {
 
 public: // With description
 
   static G4VVisManager* GetConcreteInstance ();
   // Returns pointer to actual visualization manager if a view is
   // available for drawing, else returns null.  Always check value.
 
 public:
 
   G4VVisManager ();
   virtual ~G4VVisManager ();
 
 public: // With description
 
   ///////////////////////////////////////////////////////////////////////
   // Draw methods for Geant4 Visualization Primitives, useful
   // for representing hits, digis, etc.
 
   virtual void Draw (const G4Circle&,
     const G4Transform3D& objectTransformation = G4Transform3D()) = 0;
 
   virtual void Draw (const G4Polyhedron&,
     const G4Transform3D& objectTransformation = G4Transform3D()) = 0;
 
   virtual void Draw (const G4Polyline&,
     const G4Transform3D& objectTransformation = G4Transform3D()) = 0;
 
   virtual void Draw (const G4Polymarker&,
     const G4Transform3D& objectTransformation = G4Transform3D()) = 0;
 
   virtual void Draw (const G4Square&,
     const G4Transform3D& objectTransformation = G4Transform3D()) = 0;
 
   virtual void Draw (const G4Text&,
     const G4Transform3D& objectTransformation = G4Transform3D()) = 0;
 
   ///////////////////////////////////////////////////////////////////////
   // For 2D methods, the x,y coordinates are interpreted as screen
   // coordinates, -1 < x,y < 1.  The z-coordinate is ignored.
 
   virtual void Draw2D (const G4Circle&,
     const G4Transform3D& objectTransformation = G4Transform3D()) = 0;
 
   virtual void Draw2D (const G4Polyhedron&,
     const G4Transform3D& objectTransformation = G4Transform3D()) = 0;
 
   virtual void Draw2D (const G4Polyline&,
     const G4Transform3D& objectTransformation = G4Transform3D()) = 0;
 
   virtual void Draw2D (const G4Polymarker&,
     const G4Transform3D& objectTransformation = G4Transform3D()) = 0;
 
   virtual void Draw2D (const G4Square&,
     const G4Transform3D& objectTransformation = G4Transform3D()) = 0;
 
   virtual void Draw2D (const G4Text&,
     const G4Transform3D& objectTransformation = G4Transform3D()) = 0;
 
   ///////////////////////////////////////////////////////////////////////
   // Draw methods for Geant4 Objects as if they were Visualization
   // Primitives.  Note that the visualization attributes needed in
   // some cases override any visualization attributes that are
   // associated with the object itself - thus you can, for example,
   // change the colour of a physical volume.
 
   virtual void Draw (const G4VTrajectory&) = 0;
 
   virtual void Draw (const G4VHit&) = 0;
 
   virtual void Draw (const G4VDigi&) = 0;
 
   virtual void Draw (const G4LogicalVolume&, const G4VisAttributes&,
     const G4Transform3D& objectTransformation = G4Transform3D()) = 0;
 
   virtual void Draw (const G4VPhysicalVolume&, const G4VisAttributes&,
     const G4Transform3D& objectTransformation = G4Transform3D()) = 0;
 
   virtual void Draw (const G4VSolid&, const G4VisAttributes&,
     const G4Transform3D& objectTransformation = G4Transform3D()) = 0;
 
   virtual void DrawGeometry
   (G4VPhysicalVolume*, const G4Transform3D& t = G4Transform3D());
   // Draws a geometry tree starting at the specified physical volume.
 
   //////////////////////////////////////////////////////////////////////
   // Optional methods that you may use to bracket a series of Draw
   // messages that have identical objectTransformation to improve
   // drawing speed.  Use Begin/EndDraw for a series of Draw messages,
   // Begin/EndDraw2D for a series of Draw2D messages.  Do not mix Draw
   // and Draw2D messages.
 
   virtual void BeginDraw
   (const G4Transform3D& objectTransformation = G4Transform3D()) = 0;
 
   virtual void EndDraw () = 0;
 
   virtual void BeginDraw2D
   (const G4Transform3D& objectTransformation = G4Transform3D()) = 0;
 
   virtual void EndDraw2D () = 0;
 
   //////////////////////////////////////////////////////////////////////
   // Other methods...
 
   virtual void GeometryHasChanged () = 0;
   // This is used by the run manager to notify a change of geometry.
 
   virtual void IgnoreStateChanges(G4bool);
   // This method shoud be invoked by a class that has its own event loop,
   // such as the RayTracer, material scanner, etc. If the argument is true,
   // the following state changes among Idle, GeomClosed and EventProc are
   // caused by such a class, and thus not by the ordinary event simulation.
   // The same method with false should be invoked once such an event loop
   // is over.
 
   virtual void NotifyHandlers () {}
   // Notify scene handlers (G4VGraphicsScene objects) that the scene
   // has changed so that they may rebuild their graphics database, if
   // any, and redraw all views.
 
   virtual void DispatchToModel(const G4VTrajectory&) = 0;
   // Draw the trajectory.
 
   virtual G4bool FilterTrajectory(const G4VTrajectory&) = 0;
   // Trajectory filter
 
   virtual G4bool FilterHit(const G4VHit&) = 0;
   // Hit filter
 
   virtual G4bool FilterDigi(const G4VDigi&) = 0;
   // Digi filter
 
 #ifdef G4MULTITHREADED
 
   virtual void SetUpForAThread() = 0;
   // This method is invoked by G4WorkerRunManager
 
 #endif
 
 protected:
 
   static void SetConcreteInstance (G4VVisManager*);
 
   static G4VVisManager* fpConcreteInstance;  // Pointer to real G4VisManager.
 
 };
 
 #endif

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