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// $Id: G4PolarizationHelper.hh,v 1.2 2007/11/01 17:30:25 schaelic Exp $
// tag $Name: geant4-09-03 $
//
// GEANT4 Class header file
//
//
// File name:     G4PolarizationHelper
//
// Author:        Andreas Schaelicke
//
// Creation date: 12.08.2006
//
// Class Description:
//
//   Provides some basic polarization transformation routines.

#ifndef G4PolarizationHelper_h
#define G4PolarizationHelper_h 1

#include "globals.hh"
#include "G4ThreeVector.hh"
#include "Randomize.hh"


class G4PolarizationHelper {
public:
  static G4ThreeVector GetFrame(const G4ThreeVector &, const G4ThreeVector &);
  static G4ThreeVector GetParticleFrameX(const G4ThreeVector &);
  static G4ThreeVector GetParticleFrameY(const G4ThreeVector &);
  static G4ThreeVector GetRandomFrame(const G4ThreeVector &);

  static G4ThreeVector GetSpinInPRF(const G4ThreeVector &uZ,const G4ThreeVector &spin);

  static void TestPolarizationTransformations();
  static void TestInteractionFrame();
};

#endif
