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//
// $Id$
//
// 
// John Allison  17th August 2013
//
// Class Description:
//
// Model that knows how to draw the magnetic field.

#ifndef G4MAGNETICFIELDMODEL_HH
#define G4MAGNETICFIELDMODEL_HH

#include "G4VModel.hh"

class G4Colour;
class G4Polyhedron;

class G4MagneticFieldModel: public G4VModel {

public: // With description

  enum Representation {fullArrow, lightArrow};

  G4MagneticFieldModel
  (G4int nDataPointsPerHalfScene = 10,
   Representation representation = Representation::fullArrow,
   G4int arrow3DLineSegmentsPerCircle = 6);
  virtual ~G4MagneticFieldModel ();

  virtual void DescribeYourselfTo (G4VGraphicsScene&);
  // The main task of a model is to describe itself to the graphics scene.

private:

  // Private copy contructor and assignment to forbid use...
  G4MagneticFieldModel (const G4MagneticFieldModel&);
  G4MagneticFieldModel& operator = (const G4MagneticFieldModel&);

  // No. of data points sampled per maximum half scene extent.
  // Note that total number of data poinrs sampled can be as high as
  // (2*n+1)^3, which can get very big very soon.
  G4int fNDataPointsPerMaxHalfScene;

  Representation fRepresentation;

  G4int fArrow3DLineSegmentsPerCircle;
};

#endif
