G4UniformMagField.cc

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//
// G4UniformMagField implementation
//
// Author: Vladimir Grichine (CERN), 30.01.1997
// -------------------------------------------------------------------
 
#include "G4UniformMagField.hh"
#include "G4PhysicalConstants.hh"
 
G4UniformMagField::G4UniformMagField(const G4ThreeVector& FieldVector )
{
   fFieldComponents[0] = FieldVector.x();
   fFieldComponents[1] = FieldVector.y();
   fFieldComponents[2] = FieldVector.z();
}
 
G4UniformMagField::G4UniformMagField (const G4UniformMagField& p)
   : G4MagneticField(p)
{
   for (auto 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 (auto i=0; i<3; ++i)
   {
     fFieldComponents[i] = p.fFieldComponents[i];
   }
   return *this;
}
 
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() : "
          << "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 );
   }
   fFieldComponents[0] = vField*std::sin(vTheta)*std::cos(vPhi) ;
   fFieldComponents[1] = vField*std::sin(vTheta)*std::sin(vPhi) ;
   fFieldComponents[2] = vField*std::cos(vTheta) ;
}
 
// ------------------------------------------------------------------------
 
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;
}