IMagneticFieldSvc.h

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* This software is distributed under the terms of the Apache version 2 licence,     *
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#pragma once
 
#include <GaudiKernel/IService.h>
#include <GaudiKernel/StatusCode.h>
 
namespace ROOT {
  namespace Math {
    class DefaultCoordinateSystemTag;
 
    // from Math/Point3Dfwd.h
    template <class CoordSystem, class Tag>
    class PositionVector3D;
    // from Math/Vector3Dfwd.h
    template <class CoordSystem, class Tag>
    class DisplacementVector3D;
    // from Math/Point3Dfwd.h
    template <typename T>
    class Cartesian3D;
    // from Math/Point3Dfwd.h
    typedef PositionVector3D<Cartesian3D<double>, DefaultCoordinateSystemTag> XYZPoint;
    // from Math/Vector3Dfwd.h
    typedef DisplacementVector3D<Cartesian3D<double>, DefaultCoordinateSystemTag> XYZVector;
  } // namespace Math
} // namespace ROOT

class GAUDI_API IMagneticFieldSvc : virtual public IService {
 
public:
  DeclareInterfaceID( IMagneticFieldSvc, 2, 0 );
 
  // Get the magnetic field vector at a given point in space.
  // Input: XYZPoint - Point at which magnetic field vector is to be given.
  // Output: XYZVector - Magnetic field vector.
  // Return: StatusCode SUCCESS if calculation was performed.
  virtual StatusCode fieldVector( const ROOT::Math::XYZPoint& xyz, ROOT::Math::XYZVector& fvec ) const = 0;
};