Import Geant4 11.2.0.beta source tree

2023-06-30 09:09:57 +02:00
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+//
+// ********************************************************************
+// * License and Disclaimer                                           *
+// *                                                                  *
+// * The  Geant4 software  is  copyright of the Copyright Holders  of *
+// * the Geant4 Collaboration.  It is provided  under  the terms  and *
+// * conditions of the Geant4 Software License,  included in the file *
+// * LICENSE and available at  http://cern.ch/geant4/license .  These *
+// * include a list of copyright holders.                             *
+// *                                                                  *
+// * Neither the authors of this software system, nor their employing *
+// * institutes,nor the agencies providing financial support for this *
+// * work  make  any representation or  warranty, express or implied, *
+// * regarding  this  software system or assume any liability for its *
+// * use.  Please see the license in the file  LICENSE  and URL above *
+// * for the full disclaimer and the limitation of liability.         *
+// *                                                                  *
+// * This  code  implementation is the result of  the  scientific and *
+// * technical work of the GEANT4 collaboration.                      *
+// * By using,  copying,  modifying or  distributing the software (or *
+// * any work based  on the software)  you  agree  to acknowledge its *
+// * use  in  resulting  scientific  publications,  and indicate your *
+// * acceptance of all terms of the Geant4 Software license.          *
+// ********************************************************************
+//
+////////////////////////////////////////////////////////////////////////////////
+//                                                                            //
+//  File:   G4BetaSpectrumSampler.hh                                          //
+//  Author: D.H. Wright                                                       //
+//  Date:   21 November 2022                                                  //
+//  Description: samples a spectrum which is a piece-wise linear function of  //
+//               energy. The CDF is calculated by trapezoidal integration     //
+//               and within bins the line y = mx + b is sampled.              //
+//                                                                            //
+////////////////////////////////////////////////////////////////////////////////
+
+#ifndef G4BetaSpectrumSampler_h
+#define G4BetaSpectrumSampler_h 1
+
+#include "globals.hh"
+#include "Randomize.hh"
+#include <vector>
+
+class G4BetaSpectrumSampler
+{
+  public:
+    G4BetaSpectrumSampler(const G4double* aPDF, G4int pdfSize, G4double e);
+
+    ~G4BetaSpectrumSampler() = default;
+
+    G4double shoot();
+
+  private:
+    G4double sampleSlopedLine();  // Method to sample under sloped line
+  
+    std::vector<double> pdf;      // Spectrum shape
+    std::vector<double> cdf;      // Cumulative distribution function
+
+    G4double eEnd;                // Endpoint energy of spectrum
+    G4int nBins;                  // Number of lower bin edges in spectrum 
+    G4int lowerBinEdge;           // Index of lower bin edge 
+    G4int upperBinEdge;           // Index of upper bin edge
+    G4double ylower{0.0};         // Value at lower bin edge
+    G4double yupper{0.0};         // Value at upper bin edge
+};
+#endif
+