include/MyGlobalField.hh

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#ifndef MyGlobalField_h
#define MyGlobalField_h 1

#include <vector>

#include "G4FieldManager.hh"
#include "G4PropagatorInField.hh"
#include "G4MagIntegratorStepper.hh"
#include "G4ChordFinder.hh"

#include "G4MagneticField.hh"
#include "G4ElectroMagneticField.hh"

#include "G4Mag_EqRhs.hh"
#include "G4Mag_SpinEqRhs.hh"

#include "G4EqMagElectricField.hh"
#include "G4EqEMFieldWithSpin.hh"

#include "MyGlobalFieldMessenger.hh"
#include "MyElementField.hh"

//  MyGlobalField - handles the global ElectroMagnetic field
//
//  There is a single G04GlobalField object.
//
//  The field from each individual beamline element is given by a
//  ElementField object. Any number of overlapping ElementField
//  objects can be added to the global field. Any element that
//  represents an element with an EM field must add the appropriate
//  ElementField to the global GlobalField object.

typedef std::vector<MyElementField*> FieldList;

class MyGlobalField : public G4ElectroMagneticField {
    //class MyGlobalField : public G4MagneticField {

    private:

        MyGlobalField();
        MyGlobalField(const MyGlobalField&);

        ~MyGlobalField();

        MyGlobalField& operator=(const MyGlobalField&);

        void setupArray();

    public:

        static MyGlobalField* getObject();

        void GetFieldValue(const G4double* point, G4double* field) const;

        G4bool DoesFieldChangeEnergy() const { return true; }

        void addElementField(MyElementField* f) { if (fields) fields->push_back(f); }

        void clear();

        void updateField();

        void SetStepperType( G4int i ) { fStepperType = i; }

        void SetStepper();

        void SetMinStep(G4double s) { minStep = s; }

        void SetDeltaChord(G4double s) { deltaChord = s; }

        void SetDeltaOneStep(G4double s) { deltaOneStep = s; }

        void SetDeltaIntersection(G4double s) { deltaIntersection = s; }

        void SetEpsMin(G4double s) { epsMin = s; }

        void SetEpsMax(G4double s) { epsMax = s; }

        FieldList* getFields() { return fields; }

    protected:

        G4FieldManager* GetGlobalFieldManager();

    private:

        static MyGlobalField* object;

        G4int nfp;
        G4bool first;

        FieldList* fields;

        const MyElementField **fp;

    private:

        G4int fStepperType;

        G4double minStep;
        G4double deltaChord;
        G4double deltaOneStep;
        G4double deltaIntersection;
        G4double epsMin;
        G4double epsMax;

        //  G4Mag_EqRhs*            fEquation;
        //  G4Mag_SpinEqRhs*        fEquation;

        //  G4EqMagElectricField*   fEquation;
        G4EqEMFieldWithSpin*    fEquation;

        G4FieldManager*         fFieldManager;
        G4PropagatorInField*    fFieldPropagator;
        G4MagIntegratorStepper* fStepper;
        G4ChordFinder*          fChordFinder;

        MyGlobalFieldMessenger*         fGlobalFieldMessenger;

};
#endif

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