| 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 | // $Id: TiaraIsotropicDirections.cc,v 1.5 2006/06/29 15:45:12 gunter Exp $
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| 27 | // GEANT4 tag $Name: $
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| 28 | //
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| 29 |
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| 30 | #include "TiaraIsotropicDirections.hh"
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| 31 | #include "TiaraDimensions.hh"
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| 32 | #include "Randomize.hh"
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| 33 | #include <cmath>
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| 34 |
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| 35 | TiaraIsotropicDirections::
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| 36 | TiaraIsotropicDirections(G4double colWidth,
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| 37 | const TiaraDimensions &tiaraDimensions) :
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| 38 | fMinCos(MinimumCosine(colWidth,
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| 39 | tiaraDimensions))
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| 40 | {}
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| 41 |
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| 42 | TiaraIsotropicDirections::~TiaraIsotropicDirections()
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| 43 | {}
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| 44 |
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| 45 | TiaraIsotropicDirections::
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| 46 | TiaraIsotropicDirections(const TiaraIsotropicDirections& rhs)
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| 47 | : TiaraVDirectionGenerator()
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| 48 | {
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| 49 | *this = rhs;
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| 50 | }
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| 51 |
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| 52 | G4double TiaraIsotropicDirections::
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| 53 | MinimumCosine(G4double colWidth,
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| 54 | const TiaraDimensions &tiaraDimensions) {
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| 55 | G4double l(tiaraDimensions.distTargetExperiment + colWidth);
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| 56 | G4double r(tiaraDimensions.pipeRadius);
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| 57 | G4double R(std::sqrt(std::pow(l, 2) + std::pow(r, 2)));
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| 58 | return l/R;
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| 59 | }
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| 60 |
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| 61 | TiaraIsotropicDirections& TiaraIsotropicDirections::
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| 62 | operator=(const TiaraIsotropicDirections& rhs){
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| 63 | if (this != &rhs) {
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| 64 | fMinCos = rhs.fMinCos;
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| 65 | }
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| 66 | return *this;
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| 67 | }
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| 68 |
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| 69 | TiaraVDirectionGenerator *TiaraIsotropicDirections::Clone() const {
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| 70 | return new TiaraIsotropicDirections(*this);
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| 71 | }
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| 72 |
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| 73 |
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| 74 | G4ThreeVector TiaraIsotropicDirections::GetDirection(){
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| 75 | G4double cosTh(fMinCos + G4UniformRand() * (1 - fMinCos));
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| 76 | G4double sinTh(std::sqrt(1-std::pow(cosTh,2)));
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| 77 | G4double phi(G4UniformRand() * 2*pi);
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| 78 | G4double x(sinTh * std::cos(phi));
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| 79 | G4double y(sinTh * std::sin(phi));
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| 80 | return G4ThreeVector(x, y, cosTh);
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| 81 | }
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| 82 |
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