Import Geant4 0.0.0 source tree

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+// This code implementation is the intellectual property of
+// the RD44 GEANT4 collaboration.
+//
+// By copying, distributing or modifying the Program (or any work
+// based on the Program) you indicate your acceptance of this statement,
+// and all its terms.
+//
+// $Id: G4VView.hh,v 2.3 1998/11/06 13:43:05 allison Exp $
+// GEANT4 tag $Name: geant4-00 $
+//
+// 
+// John Allison  27th March 1996
+// Abstract interface class for graphics views.
+
+#ifndef G4VVIEW_HH
+#define G4VVIEW_HH
+
+#include "globals.hh"
+
+#include "G4ViewParameters.hh"
+
+class G4VScene;
+
+class G4VView {
+
+  friend ostream& operator << (ostream& os, const G4VView& v);
+
+public:
+
+  G4VView (G4VScene& scene, G4int id, const G4String& name = "");
+  virtual ~G4VView ();
+
+  // For RWTPtrOrderedVector...
+  G4bool operator == (const G4VView& view) const;
+
+  //////////////////////////////////////////////////////////////
+  // View manipulation functions.
+
+  virtual void SetView () = 0;
+  // Take view parameters and work out model/view transformation,
+  // projection transformation, lighting, etc.
+
+  virtual void ClearView () = 0;
+  // Clear screen/viewing buffers.
+
+  virtual void DrawView () = 0;
+  // Draw scene - see example of a minimal function at end of this file.
+
+  virtual void ShowView ();
+  // Show view (for graphics systems which require to process
+  // all drawn objects before finalising the view).
+
+  virtual void FinishView ();
+  // Called at the end of drawing scene.  Used to flush streams, or
+  // swap buffers.  (Perhaps it is inappropriately named, perhaps its
+  // function could be incorporated into EndModeling ().  It marks the
+  // end of scene drawing; be aware hits and digi drawing may Follow.
+  // It is not yet the end of all drawing; that is signalled by
+  // ShowView ().)
+
+  //////////////////////////////////////////////////////////////
+  // Access functions.
+  const G4String&         GetName           () const;
+  void                    SetName           (const G4String&);
+  G4int                   GetViewId         () const;
+        G4VScene*         GetScene          () const;
+  const G4ViewParameters& GetViewParameters () const;
+  void SetViewParameters  (const G4ViewParameters& vp);
+
+  //////////////////////////////////////////////////////////////
+  // Public utility functions.
+
+  const G4VisAttributes*  GetApplicableVisAttributes
+                                            (const G4VisAttributes*) const;
+
+  void SetNeedKernelVisit ();
+  // Sets individual need-visit flags.
+
+  void NeedKernelVisit ();
+  // Flags all views the need to re-visit the GEANT4 kernel to refresh
+  // the scene.
+
+protected:
+
+  void ProcessView ();
+  // Used by DrawView ().  Invokes SetView ().  The basic logic is here.
+
+  //////////////////////////////////////////////////////////////
+  // Data members
+  G4VScene&        fScene;     // Abstract scene for this view.
+  G4int            fViewId;    // Id of this instance.
+  G4String         fName;
+  G4ViewParameters fVP;        // Viewing parameters.
+
+  //////////////////////////////////////////////////////////////
+  // Other parameters.
+  G4bool           fModified;         // If View Parameters have been modified.
+  G4bool           fNeedKernelVisit;  // See DrawView() for comments.
+};
+
+#include "G4VView.icc"
+
+/*********************************************
+
+Here is a minimal DrawView () as it might be implemented in the
+concrete view.
+
+void G4VView::DrawView () {  // Default - concrete view usually overrides.
+
+  // First, a view should decide when to re-visit the G4 kernel.
+  // Sometimes it might not be necessary, e.g., if the scene is stored
+  // in a graphical database (e.g., OpenGL's display lists) and only
+  // the viewing angle has changed.  But graphics systems without a
+  // graphical database will always need to visit the G4 kernel.
+
+  NeedKernelVisit ();  // Default is - always visit G4 kernel.
+  // Note: this routine sets the fNeedKernelVisit flag of *all* the views of
+  // the scene.
+
+  ProcessView ();             // The basic logic is here.
+
+  // Then a view may have more to do, e.g., display the graphical
+  // database.  That code should come here before finally...
+
+  FinishView ();              // Flush streams and/or swap buffers.
+}
+
+*********************************************/
+
+#endif