| 1 | //
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| 2 | // ********************************************************************
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| 3 | // * License and Disclaimer *
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| 4 | // * *
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of *
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and *
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| 7 | // * conditions of the Geant4 Software License, included in the file *
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These *
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| 9 | // * include a list of copyright holders. *
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| 10 | // * *
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| 11 | // * Neither the authors of this software system, nor their employing *
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| 12 | // * institutes,nor the agencies providing financial support for this *
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| 13 | // * work make any representation or warranty, express or implied, *
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| 14 | // * regarding this software system or assume any liability for its *
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| 15 | // * use. Please see the license in the file LICENSE and URL above *
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| 16 | // * for the full disclaimer and the limitation of liability. *
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| 17 | // * *
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| 18 | // * This code implementation is the result of the scientific and *
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| 19 | // * technical work of the GEANT4 collaboration. *
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| 20 | // * By using, copying, modifying or distributing the software (or *
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| 21 | // * any work based on the software) you agree to acknowledge its *
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| 22 | // * use in resulting scientific publications, and indicate your *
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| 23 | // * acceptance of all terms of the Geant4 Software license. *
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| 24 | // ********************************************************************
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| 25 | //
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| 26 | //
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| 27 | // $Id: G4BlineEquation.cc,v 1.2 2006/06/29 17:15:07 gunter Exp $
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| 28 | // GEANT4 tag $Name: $
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| 29 | //
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| 30 | //
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| 31 | // --------------------------------------------------------------------
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| 32 | //
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| 33 | // G4BlineEquation implementation
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| 34 | //
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| 35 | // --------------------------------------------------------------------
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| 36 | // Author: Laurent Desorgher (desorgher@phim.unibe.ch)
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| 37 | // Created - 2003-10-06
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| 38 | // --------------------------------------------------------------------
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| 39 |
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| 40 | #include "G4BlineEquation.hh"
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| 41 |
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| 42 | ///////////////////////////////////////////////////////////////////////////
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| 43 |
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| 44 | G4BlineEquation::G4BlineEquation( G4MagneticField* MagField )
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| 45 | : G4Mag_EqRhs( MagField )
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| 46 | {
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| 47 | backward_direction=false;
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| 48 | direction=1.;
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| 49 | }
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| 50 |
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| 51 | ///////////////////////////////////////////////////////////////////////////
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| 52 |
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| 53 | G4BlineEquation::~G4BlineEquation()
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| 54 | {
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| 55 | }
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| 56 |
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| 57 | /////////////////////////////////////////////////////////////////////////////
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| 58 |
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| 59 | void G4BlineEquation::EvaluateRhsGivenB( const G4double y[],
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| 60 | const G4double B[3],
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| 61 | G4double dydx[] ) const
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| 62 | {
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| 63 | G4double Bmag = direction*std::sqrt(B[0]*B[0] + B[1]*B[1] + B[2]*B[2]);
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| 64 | dydx[0] = B[0]/Bmag;
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| 65 | dydx[1] = B[1]/Bmag;
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| 66 | dydx[2] = B[2]/Bmag;
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| 67 |
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| 68 | dydx[3]=0. * y[0]; //y[0] is used to remove warning
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| 69 | dydx[4]=0.;
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| 70 | dydx[5]=0.;
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| 71 | }
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| 72 |
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| 73 | //////////////////////////////////////////////////////////////////////
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| 74 |
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| 75 | void G4BlineEquation::SetBackwardDirectionOfIntegration(G4bool abool)
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| 76 | {
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| 77 | backward_direction=abool;
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| 78 | direction=1.;
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| 79 | if (backward_direction) direction= -1.;
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| 80 | }
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