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G4CachedMagneticField.cc
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25 //
26 // G4CachedMagneticField implementation
27 //
28 // Author: J.Apostolakis, 20 July 2009.
29 // --------------------------------------------------------------------
30 
31 #include "G4CachedMagneticField.hh"
32 
34  G4double distance)
35  : G4MagneticField(), fpMagneticField(pMagField), fDistanceConst(distance),
36  fLastLocation(DBL_MAX,DBL_MAX,DBL_MAX), fLastValue(DBL_MAX,DBL_MAX,DBL_MAX)
37 {
38  ClearCounts();
39 }
40 
42 {
43  // Cannot use copy constructor: need to clone the associated magnetic field
44 
45  G4MagneticField* aF = static_cast<G4MagneticField*>(fpMagneticField->Clone());
47 
48  cloned->fLastLocation = fLastLocation;
49  cloned->fLastValue = fLastValue;
50  return cloned;
51 }
52 
54 {
55 }
56 
57 void
59 {
60  G4cout << " Cached field: " << G4endl
61  << " Number of calls: " << fCountCalls << G4endl
62  << " Number of evaluations : " << fCountEvaluations << G4endl;
63 }
64 
67  : G4MagneticField(rightCMF)
68 {
69  fpMagneticField= rightCMF.fpMagneticField; // NOTE: sharing pointer here!
70  fDistanceConst = rightCMF.fDistanceConst;
71  fLastLocation = rightCMF.fLastLocation;
72  fLastValue = rightCMF.fLastValue;
73  ClearCounts();
74 }
75 
78 {
79  if (&p == this) { return *this; }
81  fpMagneticField= p.fpMagneticField; // NOTE: sharing pointer here!
85  ClearCounts();
86  return *this;
87 }
88 
89 void
91  G4double* Bfield ) const
92 {
93  G4ThreeVector newLocation( Point[0], Point[1], Point[2] );
94 
95  G4double distSq= (newLocation-fLastLocation).mag2();
96  ++fCountCalls;
97  if( distSq < fDistanceConst*fDistanceConst )
98  {
99  Bfield[0] = fLastValue.x();
100  Bfield[1] = fLastValue.y();
101  Bfield[2] = fLastValue.z();
102  }
103  else
104  {
105  fpMagneticField->GetFieldValue( Point, Bfield );
107  fLastLocation = G4ThreeVector( Point[0], Point[1], Point[2] );
108  fLastValue = G4ThreeVector( Bfield[0], Bfield[1], Bfield[2] );
109  }
110 }