G4UniformMagField.cc

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// $Id: G4UniformMagField.cc 96751 2016-05-04 09:39:38Z gcosmo $
//
//
// Class for creation of uniform Magnetic Field
//
// 30.1.97 V.Grichine
//
// -------------------------------------------------------------------

#include "G4UniformMagField.hh"
#include "G4PhysicalConstants.hh"

G4UniformMagField::G4UniformMagField(const G4ThreeVector& FieldVector )
{
      fFieldComponents[0] = FieldVector.x();
      fFieldComponents[1] = FieldVector.y();
      fFieldComponents[2] = FieldVector.z();
}

G4Field* G4UniformMagField::Clone() const
{
    return new G4UniformMagField( G4ThreeVector(fFieldComponents[0],
                                                fFieldComponents[1],
                                                fFieldComponents[2]) );
}

void
G4UniformMagField::SetFieldValue(const G4ThreeVector& newFieldVector )
{
      fFieldComponents[0] = newFieldVector.x();
      fFieldComponents[1] = newFieldVector.y();
      fFieldComponents[2] = newFieldVector.z();
}
   
G4UniformMagField::G4UniformMagField(G4double vField,
                                     G4double vTheta,
                                     G4double vPhi    )
{
   if ( (vField<0) || (vTheta<0) || (vTheta>pi) || (vPhi<0) || (vPhi>twopi) )
   {
      std::ostringstream msg;
      msg << "ERROR in G4UniformMagField::G4UniformMagField(double, double, double) : "
          << "Invalid parameter(s). " << std::endl;
      msg << " Expected " << std::endl;
      
      msg << " - Magnitude vField: Value = " << vField
          << "  Expected vField > 0 " ;
      if ( vField<0) {  msg << " <------ Erroneous "; }
      msg << std::endl;      

      msg << " - Theta angle: Value = " << vTheta
          << "  Expected between 0 <= theta <= pi = " << pi << " ";
      if ( (vTheta<0) || (vTheta>pi) ) { msg << " <------ Erroneous "; }

      msg << std::endl;
      msg << " - Phi   angle: Value = " << vPhi
          << "  Expected between 0 <=  phi  <= 2*pi = " << twopi << std::endl;
      if ( (vPhi<0) || (vPhi>twopi) ) { msg << " <------ Erroneous "; }
      
      G4Exception("G4UniformMagField::G4UniformMagField()",
                  "GeomField0002", FatalException, msg ); // "Invalid parameters.") ;
   }
   fFieldComponents[0] = vField*std::sin(vTheta)*std::cos(vPhi) ;
   fFieldComponents[1] = vField*std::sin(vTheta)*std::sin(vPhi) ;
   fFieldComponents[2] = vField*std::cos(vTheta) ;
}

G4UniformMagField::~G4UniformMagField()
{
}

G4UniformMagField::G4UniformMagField (const G4UniformMagField &p)
   : G4MagneticField(p)
{
   for (G4int i=0; i<3; i++)
   {
     fFieldComponents[i] = p.fFieldComponents[i];
   }
}

G4UniformMagField& G4UniformMagField::operator = (const G4UniformMagField &p)
{
   if (&p == this) return *this;
   G4MagneticField::operator=(p); 
   for (G4int i=0; i<3; i++)
   {
     fFieldComponents[i] = p.fFieldComponents[i];
   }
   return *this;
}

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

void G4UniformMagField::GetFieldValue (const G4double [4],
                                             G4double *B  ) const 
{
   B[0]= fFieldComponents[0] ;
   B[1]= fFieldComponents[1] ;
   B[2]= fFieldComponents[2] ;
}

G4ThreeVector G4UniformMagField::GetConstantFieldValue() const
{
   G4ThreeVector B(fFieldComponents[0],
                   fFieldComponents[1],
                   fFieldComponents[2]);
  return B;
}