JShowerMCEvtSmear.cc

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#include <string>
#include <iostream>
#include <iomanip>

#include "km3net-dataformat/offline/Head.hh"
#include "km3net-dataformat/offline/MultiHead.hh"
#include "km3net-dataformat/offline/Evt.hh"
#include "km3net-dataformat/tools/time_converter.hh"

#include "JAAnet/JHead.hh"
#include "JAAnet/JHeadToolkit.hh"
#include "JAAnet/JAAnetToolkit.hh"
#include "JDAQ/JDAQEventIO.hh"
#include "JDAQ/JDAQTimesliceIO.hh"
#include "JDAQ/JDAQSummarysliceIO.hh"
#include "JTrigger/JTriggerParameters.hh"
#include "JSupport/JTriggeredFileScanner.hh"
#include "JSupport/JFileRecorder.hh"
#include "JSupport/JMonteCarloFileSupportkit.hh"
#include "JSupport/JSupport.hh"
#include "JSupport/JMeta.hh"
#include "JPhysics/JGeanz.hh"

#include "JReconstruction/JEvt.hh"
#include "JReconstruction/JEvtToolkit.hh"

#include "Jeep/JParser.hh"
#include "Jeep/JMessage.hh"

#include <TRandom3.h>
/**
 * \file
 *
 * Auxiliary program to store Monte Carlo information from a neutrino or the primary electron in JFIT::JEvt format and 
 * smear the values of the position and time around a sphere of 4D - length. They are equally spaced following 
 * https://marcalexa.github.io/superfibonacci/
 * By default the neutrino is considered, a bool variable allows to select the primary electron instead.
 *
 * \author vcarretero
 */
int main(int argc, char **argv)
{
  using namespace std;
  using namespace JPP;
  using namespace KM3NETDAQ;

  typedef JTYPELIST<JAllTypes_t, JEvt>::typelist  typelist;

  JTriggeredFileScanner<> inputFile;
  JFileRecorder<typelist> outputFile;
  JLimit_t&      numberOfEvents = inputFile.getLimit();
  int            debug;
  bool           take_electron;
  double         length;
  int            numberOfPoints;
  try {

    JParser<> zap("Auxiliary program to store Monte Carlo true shower in format for subsequent fits.");

    zap['f'] = make_field(inputFile, "output of JTriggerEfficiency[.sh]");
    zap['o'] = make_field(outputFile)          = "mcevt.root";
    zap['n'] = make_field(numberOfEvents)      = JLimit::max();
    zap['d'] = make_field(debug)               = 2;
    zap['e'] = make_field(take_electron);
    zap['r'] = make_field(length)              = 1;
    zap['N'] = make_field(numberOfPoints)      = 100;
    zap(argc, argv);
  }
  catch(const exception& error) {
    FATAL(error.what() << endl);
  }


  const Vec offset = getOffset(getHeader(inputFile));

  outputFile.open();

  outputFile.put(JMeta(argc, argv));
  
  while (inputFile.hasNext()) {
    STATUS("event: " << setw(10) << inputFile.getCounter() << '\r'); DEBUG(endl);

    JTriggeredFileScanner<>::multi_pointer_type ps = inputFile.next();

    const JDAQEvent* tev   = ps; 
    const Evt*       event = ps;
    JEvt             out;
    const time_converter converter(*event, *tev);

    vector<Trk>::const_iterator fermion;
    
    if(!take_electron) fermion = find_if(event->mc_trks.begin(), event->mc_trks.end(), is_neutrino);
    else fermion = find_if(event->mc_trks.begin(), event->mc_trks.end(), is_electron);

    if (fermion != event->mc_trks.end()) {

      // if fermion = neutrino => fermion position = neutrino interaction vertex
      double time = converter.putTime();
      JVector3D position = getPosition(*fermion);

      // if fermion = electron => fermion position and time = EM shower brightest point 
      if(take_electron){
        JVector3D electron_dir = getDirection(*fermion);
        double shower_elongation = geanz.getMaximum(fermion->E);
        electron_dir *= shower_elongation;
        position.add(electron_dir);
        time += (shower_elongation * getInverseSpeedOfLight());
      }
      TRandom3 rand;

      double dn = 1.0 / (double)numberOfPoints;
      double mc0 = 1.0 / sqrt(2.0);
      double mc1 = 1.0 / 1.533751168755204288118041;

      for (int i = 0; i < numberOfPoints; i++)
        { 
          double s = (double)i+0.5;
          double ab = 2.0 * M_PI * s;
          double alpha = ab * mc0;
          double beta = ab * mc1;
          s *= dn;
          double r = length * sqrt(s);
          double R = length * sqrt(1.0-s);
          double x = r*sin(alpha);
          double y = r*cos(alpha);
          double z = R*sin(beta);
          double ct = R*cos(beta);

          JVector3D positionS(position.getX() + x,position.getY() + y,position.getZ() + z);
          JTrack3D td(positionS, getDirection(*fermion), time  + ct * getInverseSpeedOfLight() * getIndexOfRefraction());
          
          JTrack3E ta(td, fermion->E);
      
          ta.add(getPosition(offset));
          out.push_back(getFit(JMCEVT, ta, 0, 0.0, ta.getE()));
        }
    }

    outputFile.put(out);
  }

  STATUS(endl);

  JMultipleFileScanner<JRemove<typelist, JEvt>::typelist> io(inputFile);

  io >> outputFile;

  outputFile.close();
}