| Geant4 Cross Reference |
1 //
2 // ********************************************************************
3 // * License and Disclaimer *
4 // * *
5 // * The Geant4 software is copyright of the Copyright Holders of *
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17 // * *
18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboration. *
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24 // ********************************************************************
25 //
26 //
27 // ------------------------------------------------------------
28 // GEANT 4 class implementation file
29 // ------------------------------------------------------------
30 //
31
32 #include "G4ErrorFreeTrajParam.hh"
33 #include "G4ThreeVector.hh"
34 #include "G4SystemOfUnits.hh"
35
36 #include <iomanip>
37
38 //------------------------------------------------------------------------
39 G4ErrorFreeTrajParam::G4ErrorFreeTrajParam(const G4Point3D& pos,
40 const G4Vector3D& mom)
41 {
42 SetParameters(pos, mom);
43 }
44
45 //------------------------------------------------------------------------
46 void G4ErrorFreeTrajParam::SetParameters(const G4Point3D& pos,
47 const G4Vector3D& mom)
48 {
49 fInvP = 1. / mom.mag();
50 fDir = mom * fInvP;
51 fLambda = 90. * deg - mom.theta();
52 fPhi = mom.phi();
53 G4Vector3D vxPerp(0., 0., 0.);
54 if(mom.mag() > 0.)
55 {
56 vxPerp = mom / mom.mag();
57 }
58 G4Vector3D vyPerp = G4Vector3D(-vxPerp.y(), vxPerp.x(), 0.);
59 vyPerp /= vyPerp.mag();
60 G4Vector3D vzPerp = vxPerp.cross(vyPerp);
61 vzPerp /= vzPerp.mag();
62 // check if right handed
63 // fXPerp = pos.proj( mom );
64 G4ThreeVector posv(pos);
65 if(vyPerp.mag() != 0.)
66 {
67 // now all 2 scalar memeber variables retain the signs
68 // fYPerp = posv.project( vyPerp ).mag();
69 // fZPerp = posv.project( vzPerp ).mag();
70 fYPerp = posv.dot(vyPerp);
71 fZPerp = posv.dot(vzPerp);
72 }
73 else
74 {
75 fYPerp = 0.;
76 fZPerp = 0.;
77 }
78 }
79
80 //------------------------------------------------------------------------
81 void G4ErrorFreeTrajParam::Update(const G4Track* aTrack)
82 {
83 SetParameters(aTrack->GetPosition(), aTrack->GetMomentum());
84 }
85
86 //------------------------------------------------------------------------
87 std::ostream& operator<<(std::ostream& out, const G4ErrorFreeTrajParam& tp)
88 {
89 G4long oldprc = out.precision(8);
90 out << " InvP= " << tp.fInvP << " Theta= " << tp.fLambda
91 << " Phi= " << tp.fPhi << " YPerp= " << tp.fYPerp
92 << " ZPerp= " << tp.fZPerp << G4endl;
93 out << " momentum direction= " << tp.fDir << G4endl;
94 out.precision(oldprc);
95
96 return out;
97 }
98