BlineTracer/src/G4BlineEquation.cc

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0025 //
0026 /// \file G4BlineEquation.cc
0027 /// \brief Implementation of the G4BlineEquation class
0028
0029 // --------------------------------------------------------------------
0030 //
0031 // G4BlineEquation implementation
0032 //
0033 // --------------------------------------------------------------------
0034 // Author: Laurent Desorgher (desorgher@phim.unibe.ch)
0035 //         Created - 2003-10-06
0036 // --------------------------------------------------------------------
0037
0038 #include "G4BlineEquation.hh"
0039
0040 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0041
0042 G4BlineEquation::G4BlineEquation(G4MagneticField* magField) : G4Mag_EqRhs(magField) {}
0043
0044 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0045
0046 void G4BlineEquation::EvaluateRhsGivenB(const G4double y[], const G4double B[3],
0047                                         G4double dydx[]) const
0048 {
0049   G4double Bmag = fDirection * std::sqrt(B[0] * B[0] + B[1] * B[1] + B[2] * B[2]);
0050   dydx[0] = B[0] / Bmag;
0051   dydx[1] = B[1] / Bmag;
0052   dydx[2] = B[2] / Bmag;
0053
0054   dydx[3] = 0. * y[0];  // y[0] is used to remove warning
0055   dydx[4] = 0.;
0056   dydx[5] = 0.;
0057 }
0058
0059 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0060
0061 void G4BlineEquation::SetBackwardDirectionOfIntegration(G4bool abool)
0062 {
0063   fBackward_direction = abool;
0064   fDirection = 1.;
0065   if (fBackward_direction) fDirection = -1.;
0066 }