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S0EmEcalBar1.cxx

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// ================================================
// Implementation of S0EmEcalBar1
// ================================================

#include "FastShowerUtils/Samplers/S0EmEcalBar1.h"

#include "FastShowerUtils/PolyArgs.h"
#include "FastShowerUtils/IFn.h"
#include "FastShowerUtils/CoreSamples.h"
#include "FastShowerUtils/IProcessedDist.h"
#include "FastShowerUtils/TriangleProcessor.h"
#include "FastShowerUtils/ProcessedNormal.h"
#include "FastShowerUtils/IInTail.h"
#include "FastShowerUtils/UpdatingGaussian.h"
#include "FastShowerUtils/IConfigurer.h"
#include <cmath>
#include <iostream>

namespace FastShower{

  using std::pair;

  const double S0EmEcalBar1::s_nSigma(3.0);
  const double S0EmEcalBar1::s_tailFluctScale(0.05);

  S0EmEcalBar1::S0EmEcalBar1(IUpdatingGaussian* g, 
                             IProcessedDist* tail,
                             IInTail* it,
                             IFn* ts):
    ISampler(), ISlice0(), DebugBase("S0EmEcalBar1"), 
    m_peak(g), m_tail(tail), m_inTail(it), m_tailLowerBound(ts){}
  S0EmEcalBar1::S0EmEcalBar1(const IConfigurer* configurer,
                             const std::string&
                             ):
    DebugBase("S0"), m_peak(0), m_tail(0), m_inTail(0), m_tailLowerBound(0){
    m_peak           = configurer->findIUG( text()+"Peak" ) ;
    m_tail           = configurer->makeProcessedFlat( text() );
    m_inTail         = configurer->makeIInTail( text() );
    m_tailLowerBound = configurer->findFn( text()+"TailLowerBound");
    cout<<text()<<" finishing construction"<<endl;
  }
  ISampler* S0EmEcalBar1::clone() const {return new S0EmEcalBar1(*this);}
  void S0EmEcalBar1::sample(const PolyArgs& pa, CoreSamples& cs)const{

    if( m_inTail->operator()(pa) ){
      cs.fill(this, evalTail(pa) );
    }else{
      cs.fill(this, evalPeak(pa) );
    }
  }
  double S0EmEcalBar1::evalTail(const PolyArgs& pa) const {
    
    pair<double, double>  peakParams = m_peak->parameters(pa);
    double peakMean  = peakParams.first;
    double peakSigma = peakParams.second;
    
    //calculate ther upper and lower limits of the triangular tail
    double uLimit = peakMean - s_nSigma*peakSigma;
    //
    double lLimit = uLimit - ( m_tailLowerBound->value(pa) );
    //Add a little fluctuation in triangle base length
    ProcessedNormal normal;
    lLimit -= s_tailFluctScale*( abs( normal.sample() ) );
    if(lLimit<0.){lLimit=0.;}
    //
    //FIXME - the logic of setting limits to be made clearer
    if(uLimit<0.){ uLimit=peakMean;}

    // Sample from a Triangle dist.
    TriangleProcessor::EndPoint1  endPoint1 = lLimit;
    TriangleProcessor::EndPoint2  endPoint2 = uLimit;
    
    TriangleProcessor tp(endPoint1,endPoint2);
    return m_tail->sample(&tp);
  }
  double S0EmEcalBar1::evalPeak(const PolyArgs& pa)const{
    return m_peak->sample(0.0, s_nSigma, 1.0, s_nSigma, pa);
  }
  double S0EmEcalBar1::lastValue(const CoreSamples& cs) const {
    return cs.give(this);
  }
  void S0EmEcalBar1::components(IDebug::Cpts& v) const{
    v.push_back(m_peak);
    v.push_back(m_tail);
    v.push_back(m_inTail);
    v.push_back(m_tailLowerBound);
  }
  
}//namespace

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