Gabriele Cosmo
80 lines
2.9 KiB
C++
80 lines
2.9 KiB
C++
//
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// ********************************************************************
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// * DISCLAIMER *
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// * *
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// * The following disclaimer summarizes all the specific disclaimers *
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// * of contributors to this software. The specific disclaimers,which *
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// * govern, are listed with their locations in: *
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// * http://cern.ch/geant4/license *
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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. *
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// * *
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// * This code implementation is the intellectual property of the *
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// * GEANT4 collaboration. *
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// * By copying, distributing or modifying the Program (or any work *
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// * based on the Program) you indicate your acceptance of this *
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// * statement, and all its terms. *
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// ********************************************************************
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//
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// $Id: TiaraIsotropicDirections.cc,v 1.4 2003/12/04 11:08:48 gcosmo Exp $
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// GEANT4 tag $Name: geant4-07-01 $
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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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