Gabriele Cosmo
98 lines
3.7 KiB
C++
98 lines
3.7 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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//
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// ------------------------------------------------------------
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// GEANT 4 class implementation file
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// ------------------------------------------------------------
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//
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#include "G4ErrorFreeTrajParam.hh"
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#include "G4ThreeVector.hh"
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#include "G4SystemOfUnits.hh"
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#include <iomanip>
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//------------------------------------------------------------------------
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G4ErrorFreeTrajParam::G4ErrorFreeTrajParam(const G4Point3D& pos,
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const G4Vector3D& mom)
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{
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SetParameters(pos, mom);
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}
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//------------------------------------------------------------------------
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void G4ErrorFreeTrajParam::SetParameters(const G4Point3D& pos,
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const G4Vector3D& mom)
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{
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fInvP = 1. / mom.mag();
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fDir = mom * fInvP;
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fLambda = 90. * deg - mom.theta();
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fPhi = mom.phi();
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G4Vector3D vxPerp(0., 0., 0.);
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if(mom.mag() > 0.)
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{
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vxPerp = mom / mom.mag();
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}
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G4Vector3D vyPerp = G4Vector3D(-vxPerp.y(), vxPerp.x(), 0.);
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vyPerp /= vyPerp.mag();
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G4Vector3D vzPerp = vxPerp.cross(vyPerp);
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vzPerp /= vzPerp.mag();
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// check if right handed
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// fXPerp = pos.proj( mom );
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G4ThreeVector posv(pos);
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if(vyPerp.mag() != 0.)
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{
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// now all 2 scalar memeber variables retain the signs
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// fYPerp = posv.project( vyPerp ).mag();
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// fZPerp = posv.project( vzPerp ).mag();
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fYPerp = posv.dot(vyPerp);
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fZPerp = posv.dot(vzPerp);
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}
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else
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{
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fYPerp = 0.;
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fZPerp = 0.;
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}
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}
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//------------------------------------------------------------------------
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void G4ErrorFreeTrajParam::Update(const G4Track* aTrack)
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{
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SetParameters(aTrack->GetPosition(), aTrack->GetMomentum());
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}
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//------------------------------------------------------------------------
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std::ostream& operator<<(std::ostream& out, const G4ErrorFreeTrajParam& tp)
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{
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G4long oldprc = out.precision(8);
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out << " InvP= " << tp.fInvP << " Theta= " << tp.fLambda
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<< " Phi= " << tp.fPhi << " YPerp= " << tp.fYPerp
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<< " ZPerp= " << tp.fZPerp << G4endl;
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out << " momentum direction= " << tp.fDir << G4endl;
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out.precision(oldprc);
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return out;
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}
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