Import Geant4 10.6.0.beta source tree

2019-06-28 11:59:04 +02:00
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+//
+// ********************************************************************
+// * License and Disclaimer                                           *
+// *                                                                  *
+// * 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 *
+// * include a list of copyright holders.                             *
+// *                                                                  *
+// * Neither the authors of this software system, nor their employing *
+// * institutes,nor the agencies providing financial support for this *
+// * 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.         *
+// *                                                                  *
+// * 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 *
+// * use  in  resulting  scientific  publications,  and indicate your *
+// * acceptance of all terms of the Geant4 Software license.          *
+// ********************************************************************
+//
+// Michael Kelsey  31 January 2019
+//
+// Class Description:
+//
+// Abstract base class to implement drawing vector field geometries
+// (e.g., electric, magnetic or gravity).  Implementation extracted
+// from G4MagneticFieldModel, with field-value access left pure
+// virtual for implementation by base classes.
+
+#ifndef G4VFIELDMODEL_HH
+#define G4VFIELDMODEL_HH
+
+#include "G4VModel.hh"
+#include "G4Point3D.hh"
+#include "G4PhysicalVolumesSearchScene.hh"
+
+#include <vector>
+
+class G4Field;
+
+class G4VFieldModel: public G4VModel {
+
+public: // With description
+  
+  enum Representation {fullArrow, lightArrow};
+
+  G4VFieldModel
+  (const G4String& typeOfField, const G4String& symbol="",
+   const G4VisExtent& extentForField = G4VisExtent(),
+   const std::vector<G4PhysicalVolumesSearchScene::Findings>& pvFindings
+   = std::vector<G4PhysicalVolumesSearchScene::Findings>(),
+   G4int nDataPointsPerHalfScene = 10,
+   Representation representation = Representation::fullArrow,
+   G4int arrow3DLineSegmentsPerCircle = 6);
+  // typeOfField is "Electric" or "Magnetic" etc.
+  // symbol is "E" or "B" etc.
+
+  virtual ~G4VFieldModel();
+
+  virtual void DescribeYourselfTo(G4VGraphicsScene& sceneHandler);
+  // The main task of a model is to describe itself to the graphics scene.
+  // Note: It is in this function that the extent for drawing the filed must
+  // be calcualted. If fExtentForField is null, pick up the extent from
+  // the sceneHandler.
+
+protected:
+
+  // Subclasses MUST implement this for their particular kind of field
+  virtual void GetFieldAtLocation(const G4Field* field,
+				  const G4Point3D& position, G4double time,
+				  G4Point3D& result) const = 0;
+  // The appropriate output from GetFieldValue should be filled into result.
+  // If (field==0), the function should do nothing; returning without error.
+
+private:
+
+  // Private copy contructor and assignment to forbid use...
+  G4VFieldModel(const G4VFieldModel&);
+  G4VFieldModel& operator=(const G4VFieldModel&);
+
+  G4VisExtent fExtentForField;
+  // If null, get extent from scene handler in DescribeYourselfTo.
+
+  std::vector<G4PhysicalVolumesSearchScene::Findings> fPVFindings;
+  // If empty, use fExtentForField alone for sampling and drawing.
+  // If non-empty, use fExtentForField alone for sampling, but only
+  // draw if sampling point is in the specified physical volume(s).
+
+  G4int fNDataPointsPerMaxHalfScene;
+  // No. of data points sampled per maximum half scene.
+  // Note that total number of sampling points can be as high as
+  // (2*n+1)^3, which can get very big. However, fields are usually
+  // confined to only parts of the scene, so this may not be a problem.
+  // Sampling can be further limited with fExtentForField and/or fPVFindings.
+
+  Representation fRepresentation;       // Big arrows or just lines
+  G4int fArrow3DLineSegmentsPerCircle;
+  G4String fTypeOfField;                // "Electric" or "Magnetic" etc.
+  G4String fArrowPrefix;                // For attaching text label to arrows
+};
+
+#endif