G4ErrorFreeTrajParam.cc

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00026 // $Id: G4ErrorFreeTrajParam.cc 69766 2013-05-14 14:33:55Z gcosmo $
00027 //
00028 // ------------------------------------------------------------
00029 //      GEANT 4 class implementation file 
00030 // ------------------------------------------------------------
00031 //
00032 
00033 #include "G4ErrorFreeTrajParam.hh"
00034 #include "G4ThreeVector.hh"
00035 #include "G4SystemOfUnits.hh"
00036 
00037 #include <iomanip>
00038 
00039 //------------------------------------------------------------------------
00040 G4ErrorFreeTrajParam::G4ErrorFreeTrajParam( const G4Point3D& pos,
00041                                             const G4Vector3D& mom )
00042 {
00043   SetParameters( pos, mom );
00044 }
00045 
00046 
00047 //------------------------------------------------------------------------
00048 void G4ErrorFreeTrajParam::SetParameters( const G4Point3D& pos,
00049                                           const G4Vector3D& mom )
00050 {
00051   fInvP = 1./mom.mag();
00052   fDir = mom*fInvP;
00053   fLambda = 90.*deg - mom.theta();
00054   fPhi = mom.phi();
00055   G4Vector3D vxPerp(0.,0.,0.);
00056   if( mom.mag() > 0.) {
00057     vxPerp = mom/mom.mag();
00058   }
00059   G4Vector3D vyPerp = G4Vector3D( -vxPerp.y(), vxPerp.x(), 0.);
00060   vyPerp /= vyPerp.mag();
00061   G4Vector3D vzPerp = vxPerp.cross( vyPerp );
00062   vzPerp /= vzPerp.mag();
00063   // check if right handed
00064   //  fXPerp = pos.proj( mom );
00065   G4ThreeVector posv(pos);
00066   if( vyPerp.mag() != 0. ) {
00067     // now all 2 scalar memeber variables retain the signs
00068     //  fYPerp = posv.project( vyPerp ).mag();
00069     //  fZPerp = posv.project( vzPerp ).mag();
00070     fYPerp = posv.dot( vyPerp );
00071     fZPerp = posv.dot( vzPerp );
00072   } else {
00073     fYPerp = 0.;
00074     fZPerp = 0.;
00075   }
00076 }
00077 
00078 //------------------------------------------------------------------------
00079 void G4ErrorFreeTrajParam::Update( const G4Track* aTrack )
00080 {
00081   SetParameters( aTrack->GetPosition(), aTrack->GetMomentum() );
00082 
00083 }
00084 
00085 
00086 //------------------------------------------------------------------------
00087 std::ostream& operator<<(std::ostream& out, const G4ErrorFreeTrajParam& tp)
00088 {
00089   G4int oldprc = out.precision(8);
00090   out << " InvP= " << tp.fInvP << " Theta= "
00091       << tp.fLambda << " Phi= " << tp.fPhi << " YPerp= " << tp.fYPerp
00092       << " ZPerp= " << tp.fZPerp << G4endl;
00093   out << " momentum direction= " << tp.fDir << G4endl;
00094   out.precision(oldprc);
00095     
00096   return out;
00097 }

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