SCT_SimpleHisto.h

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// -*- C++ -*-
 
/*
  Copyright (C) 2002-2019 CERN for the benefit of the ATLAS collaboration
*/

#ifndef SCT_SimpleHisto_h
#define SCT_SimpleHisto_h
 
#include <map>
#include <string>
#include <sstream>
 
namespace SCT_ConditionsAlgorithms {
  typedef std::map<float, unsigned int> S_t;
  
  bool 
    init(S_t& s, const float xlo, const float xhi, const unsigned int nbins) {
    if ((xhi <= xlo) or (nbins<2)) return false;
    float increment{(xhi-xlo)/nbins};
    float acc{xlo};
    unsigned int init{0};
    for (unsigned int i{0}; i!=nbins; ++i) {
      s[acc]=init;
      acc+=increment;
    } 
    return (s.size()==nbins); //should be true now
  }//initHisto function
  
  //increment a bin
  int
    fill(S_t& s, const float value) {
    S_t::const_iterator start{s.begin()};
    S_t::const_iterator end{s.end()};
    unsigned int nbins{static_cast<unsigned int>(s.size())};
    if (value * nbins > ((--end)->first - start->first) * (nbins+1)) return 1;
    S_t::iterator i=s.upper_bound(value);
    if (i==start) return -1;
    ++((--i)->second);
    return 0;
  }//fill function
 
  //return xml string representation
  std::string
    asXmlString(const S_t& s) {
    std::ostringstream os;
    os<<"<histogram>\n";
    for (S_t::const_iterator i{s.begin()}; i!=s.end(); ++i) {
      os<<"<b x=\""<<i->first<<"\">"<<i->second<<"</b>\n";
    }
    os<<"</histogram>\n";
    return os.str();
  }//asXmlString
  
  std::string 
    xmlHeader(const std::string& version="1.0", const std::string& encoding="UTF-8") {
    return "<?xml version=\""+version+"\" encoding=\""+encoding+"\" standalone=\"yes\"?>";
  }
  std::string
    stylesheet(const std::string& path) {
    return "<?xml-stylesheet type=\"text/xsl\" href=\""+path+"\"?>";
  }
  
}//namespace
 
#endif // SCT_SimpleHisto_h