| 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: G4CachedMagneticField.cc,v 1.1 2009/11/05 11:06:13 japost 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 | #include "G4CachedMagneticField.hh"
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| 33 |
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| 34 | G4CachedMagneticField::G4CachedMagneticField(G4MagneticField *pMagField,
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| 35 | G4double distance)
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| 36 | : G4MagneticField(),
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| 37 | fLastLocation(DBL_MAX,DBL_MAX,DBL_MAX),
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| 38 | fLastValue(DBL_MAX,DBL_MAX,DBL_MAX),
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| 39 | fCountCalls(0), fCountEvaluations(0)
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| 40 | {
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| 41 | fpMagneticField= pMagField;
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| 42 | fDistanceConst= distance;
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| 43 |
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| 44 | // G4cout << " Cached-B-Field constructor> Distance = " << distance << G4endl;
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| 45 | this->ClearCounts();
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| 46 | }
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| 47 |
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| 48 | G4CachedMagneticField::~G4CachedMagneticField()
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| 49 | {
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| 50 | }
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| 51 |
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| 52 | void
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| 53 | G4CachedMagneticField::ReportStatistics()
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| 54 | {
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| 55 | G4cout << " Cached field: " << this << G4endl
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| 56 | << " Number of calls: " << fCountCalls << G4endl
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| 57 | << " Number of evaluations : " << fCountEvaluations << G4endl;
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| 58 | }
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| 59 |
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| 60 | G4CachedMagneticField::G4CachedMagneticField(const G4CachedMagneticField &rightCMF)
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| 61 | : G4MagneticField()
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| 62 | {
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| 63 | fpMagneticField= rightCMF.fpMagneticField;
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| 64 | fDistanceConst = rightCMF.fDistanceConst;
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| 65 | fLastLocation = rightCMF.fLastLocation;
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| 66 | fLastValue = rightCMF.fLastValue;
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| 67 | this->ClearCounts();
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| 68 | }
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| 69 |
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| 70 | G4CachedMagneticField& G4CachedMagneticField::operator = (const G4CachedMagneticField &p)
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| 71 | {
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| 72 | if (&p == this) return *this; *this = p; return *this;
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| 73 | }
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| 74 |
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| 75 | void
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| 76 | G4CachedMagneticField::GetFieldValue( const G4double Point[4],
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| 77 | G4double *Bfield ) const
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| 78 | {
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| 79 | G4ThreeVector newLocation( Point[0], Point[1], Point[2] );
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| 80 |
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| 81 | // G4cout << "Cache-B-field called at " << newLocation << G4endl;
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| 82 |
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| 83 | G4double distSq= (newLocation-fLastLocation).mag2();
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| 84 | fCountCalls++;
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| 85 | if( distSq < fDistanceConst*fDistanceConst ) {
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| 86 | Bfield[0] = fLastValue.x();
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| 87 | Bfield[1] = fLastValue.y();
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| 88 | Bfield[2] = fLastValue.z();
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| 89 | }else{
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| 90 | // G4CachedMagneticField* thisNonC= const_cast<G4CachedMagneticField*>(this);
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| 91 | fpMagneticField->GetFieldValue( Point, Bfield );
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| 92 | // G4cout << " Evaluating. " << G4endl;
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| 93 | fCountEvaluations++;
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| 94 | // thisNonC->
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| 95 | fLastLocation= G4ThreeVector( Point[0], Point[1], Point[2] );
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| 96 | // thisNonC->
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| 97 | fLastValue= G4ThreeVector( Bfield[0], Bfield[1], Bfield[2] );
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| 98 | }
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| 99 | }
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