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#include "globals.hh"

#include "G4GeometryManager.hh"

#include "F04GlobalField.hh"

#include "F04FocusSolenoid.hh"
#include "F04SimpleSolenoid.hh"

F04FocusSolenoid::F04FocusSolenoid(G4double Ba, G4double Bb, G4double fz,
                                G4LogicalVolume* lv, 
                                G4ThreeVector c) : F04SimpleSolenoid(B1, fz, lv, c) 

{  
   B1 = Ba;
   B2 = Bb;
   Half = false;
}

void F04FocusSolenoid::addFieldValue(const G4double point[4],
                                         G4double field[6]) const
{
   G4ThreeVector global(point[0],point[1],point[2]);

   G4ThreeVector local = global2local.TransformPoint(global);

   if (isOutside(local)) return;

   G4double length = ((F04SimpleSolenoid*)this)->getLength();

   G4double Bz = (B2-B1) * std::abs(local.z())/(length/2.) + B1;

   if (Half) { if (local.z() >= 0.) Bz = B1; }

   G4ThreeVector B(0.0,0.0,Bz);

   B = global2local.Inverse().TransformAxis(B);

   field[0] += B[0];
   field[1] += B[1];
   field[2] += B[2];
}