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// $Id: G4UniformElectricField.cc,v 1.12 2006/06/29 18:24:56 gunter Exp $
// GEANT4 tag $Name: geant4-09-02-cand-01 $
//
// 
//
// Class for creation of uniform Electric Field
//
// 30.1.97 V.Grichine
//
// -------------------------------------------------------------------

#include "G4UniformElectricField.hh"

G4UniformElectricField::G4UniformElectricField(const G4ThreeVector FieldVector )
{
      fFieldComponents[0] = 0.0;
      fFieldComponents[1] = 0.0;
      fFieldComponents[2] = 0.0;
      fFieldComponents[3] = FieldVector.x();
      fFieldComponents[4] = FieldVector.y();
      fFieldComponents[5] = FieldVector.z();
}
   
G4UniformElectricField::G4UniformElectricField(G4double vField,
                                               G4double vTheta,
                                               G4double vPhi    )
{
   if(vField >= 0 && 
      vTheta >= 0 && vTheta <= pi && 
      vPhi >= 0 && vPhi <= twopi)
   {
      fFieldComponents[0] = 0.0;
      fFieldComponents[1] = 0.0;
      fFieldComponents[2] = 0.0;
      fFieldComponents[3] = vField*std::sin(vTheta)*std::cos(vPhi) ;
      fFieldComponents[4] = vField*std::sin(vTheta)*std::sin(vPhi) ;
      fFieldComponents[5] = vField*std::cos(vTheta) ;
   }
   else
   {
      G4Exception("G4UniformElectricField::G4UniformElectricField()",
                  "WrongArgumentValue", FatalException, "Invalid parameters.");
   }
}

G4UniformElectricField::~G4UniformElectricField()
{
}

G4UniformElectricField::G4UniformElectricField (const G4UniformElectricField &p)
   : G4ElectricField(p)
{
   for (G4int i=0; i<6; i++)
      fFieldComponents[i] = p.fFieldComponents[i];
}

G4UniformElectricField&
G4UniformElectricField::operator = (const G4UniformElectricField &p)
{
   for (G4int i=0; i<6; i++)
      fFieldComponents[i] = p.fFieldComponents[i];
   return *this;
}

// ------------------------------------------------------------------------

void G4UniformElectricField::GetFieldValue (const G4double[4],
                                            G4double *fieldBandE ) const 
{
   fieldBandE[0]= 0.0;
   fieldBandE[1]= 0.0;
   fieldBandE[2]= 0.0;
   fieldBandE[3]= fFieldComponents[3] ;
   fieldBandE[4]= fFieldComponents[4] ;
   fieldBandE[5]= fFieldComponents[5] ;
}