Gabriele Cosmo
83 lines
3.1 KiB
C++
83 lines
3.1 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// $Id: TiaraIsotropicDirections.cc,v 1.5 2006/06/29 15:45:12 gunter Exp $
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// GEANT4 tag $Name: geant4-08-02 $
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//
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#include "TiaraIsotropicDirections.hh"
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#include "TiaraDimensions.hh"
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#include "Randomize.hh"
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#include <cmath>
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TiaraIsotropicDirections::
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TiaraIsotropicDirections(G4double colWidth,
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const TiaraDimensions &tiaraDimensions) :
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fMinCos(MinimumCosine(colWidth,
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tiaraDimensions))
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{}
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TiaraIsotropicDirections::~TiaraIsotropicDirections()
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{}
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TiaraIsotropicDirections::
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TiaraIsotropicDirections(const TiaraIsotropicDirections& rhs)
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: TiaraVDirectionGenerator()
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{
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*this = rhs;
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}
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G4double TiaraIsotropicDirections::
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MinimumCosine(G4double colWidth,
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const TiaraDimensions &tiaraDimensions) {
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G4double l(tiaraDimensions.distTargetExperiment + colWidth);
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G4double r(tiaraDimensions.pipeRadius);
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G4double R(std::sqrt(std::pow(l, 2) + std::pow(r, 2)));
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return l/R;
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}
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TiaraIsotropicDirections& TiaraIsotropicDirections::
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operator=(const TiaraIsotropicDirections& rhs){
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if (this != &rhs) {
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fMinCos = rhs.fMinCos;
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}
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return *this;
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}
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TiaraVDirectionGenerator *TiaraIsotropicDirections::Clone() const {
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return new TiaraIsotropicDirections(*this);
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}
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G4ThreeVector TiaraIsotropicDirections::GetDirection(){
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G4double cosTh(fMinCos + G4UniformRand() * (1 - fMinCos));
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G4double sinTh(std::sqrt(1-std::pow(cosTh,2)));
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G4double phi(G4UniformRand() * 2*pi);
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G4double x(sinTh * std::cos(phi));
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G4double y(sinTh * std::sin(phi));
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return G4ThreeVector(x, y, cosTh);
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}
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