TRootCompare.cxx

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/

 
#include "TrigValTools/TRootCompare.h"
 
#include "TClass.h"
#include "TFile.h"
#include "TCanvas.h"
#include "TKey.h"
#include "TH1.h"
#include "TEfficiency.h"
#include "TVirtualPad.h"
#include "TPaveStats.h"
#include "TError.h"
#include "TText.h"
#include "TCollection.h"
#include "THashList.h"
#include "TAxis.h"
 
#include <iostream>
#include <iomanip>
#include <algorithm>
#include <memory>
#include <math.h>
 
using namespace std;
 
 
 
TRootCompare::~TRootCompare()
{
  delete m_refFile;
}
 
void TRootCompare::beginJob()
{
  m_histMatch = 0;
  m_histTotal = 0;
  m_histMissing = 0;
  
  Int_t canvasWidth = 1000;
  Int_t canvasHeight = 580;
 
  if (!m_drawDiff) canvasWidth = canvasHeight;
  
  m_can = new TCanvas("can","can",canvasWidth,canvasHeight);
  if (m_psFile!="") printCanvas(m_psFile+"[");  
}
 
void TRootCompare::endJob()
{  
  cout << endl;
  cout << "Summary:" << endl;
  cout << "========" << endl;
  cout << "Total histograms compared: " << m_histTotal << endl;
  cout << "Missing references: " << m_histMissing << endl;
  cout << "Matching histograms: " << m_histMatch << endl;
  cout << "Different histograms: " << m_histTotal-m_histMatch << endl;
  cout << "Ignored histograms: " << m_skippedObjects.size() << endl;
  
  if (m_histMatch!=m_histTotal) {
    cout << "List of different histograms:" << endl;
    vector<string>::iterator iter;
    int i = 0;
    for (iter=m_noMatch.begin(); iter!=m_noMatch.end(); ++iter) {
      i++;
      cout << setw(2) << i << ") " << *iter << endl;
    }
  }
 
  if (verbose() && !m_skippedObjects.empty()) {
    cout << endl << "List of ignored histograms:" << endl;
    vector<string>::iterator iter;
    int i = 0;
    for (iter=m_skippedObjects.begin(); iter!=m_skippedObjects.end(); ++iter) {
      i++;
      cout << setw(2) << i << ") " << *iter << endl;
    }
  }
  cout << endl;
 
   if (m_outFile) {
    cout << "Comparison results written to " << m_outFile->GetName() << endl;
    delete m_outFile;
  }  
 
  if (m_psFile!="") {
    printCanvas(m_psFile+"]");
    cout << "Comparison results written to " << m_psFile << endl;
  }
 
  delete m_can;
}
 
void TRootCompare::processKey(TDirectory& dir, TKey& key)
{
  dir.cd();
    
  if (m_refFile==0) return;
 
  if (TString(key.GetName()).Contains("/")) {
    cout << "IGNORE: " << key.GetName() << " contains '/'" << endl;
    return;    
  }
 
  std::unique_ptr<TObject> obj(key.ReadObj());
 
  // Extract directory name
  TString dirName(dir.GetPath());
  dirName.Replace(0,dirName.First(":")+2,0);
  if (rootDir()!="") dirName.ReplaceAll(rootDir(),m_refRootDir);
  else dirName = m_refRootDir+"/"+dirName;
  TString keyPath(dirName+"/"+key.GetName());
 
  if (!m_refFile->cd(dirName)) {  // could not cd() into directory of histogram
    m_histMissing++;
    return;
  }
 
  TObject* refObj = m_refFile->Get(keyPath);
  if (!refObj) { // histogram not found
    cout << "Cannot find " << keyPath << " in reference file" << endl;
    m_histMissing++;
    return;
  }
 
  if (obj->Class()!=refObj->Class()) { // class types do not agree
    cout << key.GetName() << " is of different type in file and reference file." << endl;
    return;
  }
 
  if (obj->IsA()->InheritsFrom("TH1")) {
    TH1& h = *static_cast<TH1*>(obj.get());
    TH1& href = *static_cast<TH1*>(refObj);
 
    // For alphanumeric axes, sort and deflate
    if (m_sortLabels) {
      sortAndDeflate(h);
      sortAndDeflate(href);
    }
 
    Bool_t match = compareHist(h,href);
    m_histTotal++;
    if (match) {
      m_histMatch++;
    }
    else { // histograms do not match
      m_noMatch.push_back(keyPath.Data());
 
      // Skip drawing if no output was requested
      if (!m_outFile && m_psFile.Length()==0) return;
 
      m_can->Clear();
      m_can->Divide(2,1);
      m_can->cd(1)->SetPad(0,1,1,0.90);
      m_can->cd(2)->SetPad(0,0.90,1,0);
      TVirtualPad* pad = m_can->cd(2);
          
      if (m_drawDiff) pad->Divide(2,1);
      m_can->SetName(h.GetName());
      m_can->SetTitle(h.GetTitle());
      // Overlayed
      pad->cd(1);
      if (m_drawNormalized) {
        if (href.Integral()) href.Scale(1/href.Integral());
        if (h.Integral()) h.Scale(1/h.Integral());
      }
 
      Double_t ymax = 1.05*max(h.GetMaximum(),href.GetMaximum());
      h.SetMaximum(ymax);
      h.SetLineColor(kBlue);
      h.Draw();
      m_can->Update();
      TPaveStats* st1 = (TPaveStats*)gPad->GetPrimitive("stats");
      if (st1) {
        st1->SetName("stats1");
        st1->SetLineColor(kBlue);
      }
 
      href.SetLineColor(kRed);
      href.Draw("sames");
      m_can->Update();
      TPaveStats* st2 = (TPaveStats*)gPad->GetPrimitive("stats");
      if (st1 && st2) {
        // Move stat box
        Double_t x1 = st1->GetX1NDC()-0.01;
        st2->SetName("stats2");
        Double_t w = st2->GetX2NDC()-st2->GetX1NDC();
        st2->SetX1NDC(x1-w);
        st2->SetX2NDC(x1);
        st2->SetLineColor(kRed);
        m_can->Modified();
      }
 
      TH1* hdiff = 0;
      if (m_drawDiff) {
        hdiff = (TH1*)h.Clone();
        // Too many problems with difference of 2D histograms
        if (hdiff->GetDimension()==1 &&
            hdiff->GetNbinsX()==href.GetNbinsX()) {
          // Difference
          pad->cd(2);
          hdiff->SetName(TString(href.GetName())+" (diff)");
          hdiff->SetTitle(TString(href.GetTitle())+" (diff)");
          hdiff->SetLineColor(kBlack);
          hdiff->Add(&href,-1);
          hdiff->Draw();
          TPaveStats* st = (TPaveStats*)gPad->GetPrimitive("stats1");
          if (st) st->SetLineColor(kBlack);
        }
        if(hdiff->GetDimension()==2 &&
           hdiff->GetNbinsX()==href.GetNbinsX() &&
           hdiff->GetNbinsY()==href.GetNbinsY()) {
          pad->cd(2);
          hdiff->SetName(TString(href.GetName())+" (diff)");
          hdiff->SetTitle(TString(href.GetTitle())+" (diff)");
          hdiff->SetLineColor(kBlack);
          hdiff->Add(&href,-1);
          if(hdiff->GetXaxis()->GetLabels()!=0 && hdiff->GetNbinsX()>100) {
            TH1 * hdiffred = (TH1*)hdiff->Clone();
            hdiffred->GetXaxis()->GetLabels()->Delete();
            hdiffred->Reset();
            hdiffred->SetName(TString(href.GetName())+" (diff reduced)");
            hdiffred->SetTitle(TString(href.GetTitle())+" (diff reduced)");
            int targetbin=1;
            for(int x=1; x<=hdiff->GetNbinsX(); ++x) {
              bool isEmpty(true);
              for(int y=1;y<=hdiff->GetNbinsY();++y) {
                if(hdiff->GetBinContent(x,y)!=0) { isEmpty=false; break; }
              }
              if(!isEmpty) {
                for(int y=1;y<=hdiff->GetNbinsY();++y) {
                  if(hdiff->GetBinContent(x,y)!=0)
                    hdiffred->SetBinContent(targetbin,y,hdiff->GetBinContent(x,y));
                }
                hdiffred->GetXaxis()->SetBinLabel(targetbin,hdiff->GetXaxis()->GetBinLabel(x));
                targetbin++;
              }
            }
            hdiffred->LabelsDeflate();
            hdiffred->Draw("text");
          } else {
            hdiff->Draw("text");
          }
          TPaveStats* st = (TPaveStats*)gPad->GetPrimitive("stats1");
          if (st) st->SetLineColor(kBlack);
        }
      }
          
      // Some more cosmetics before saving to ps file
      m_can->cd(0);
      TText text;
      text.SetTextSize(0.03);
      text.SetTextAlign(22);
      TString page("page ");
      page += m_noMatch.size();
      text.DrawTextNDC(0.5,0.03,page);
 
      TString title(dir.GetName());
      title+="/";
      title+=href.GetName();
      text.DrawTextNDC(0.5,0.99,title);
 
      const int maxchars = 120; // max #chars for title
      if (m_file) {
        text.SetTextColor(kBlue);
        string s(m_file->GetName());
        text.DrawTextNDC(0.5,0.93,s.substr(max(0,int(s.size()-maxchars))).c_str());
      }
      if (m_refFile) {
        text.SetTextColor(kRed);
        string s(m_refFile->GetName());
        text.DrawTextNDC(0.5,0.96,s.substr(max(0,int(s.size()-maxchars))).c_str());
      }
                                 
      if (m_psFile!="") printCanvas(m_psFile);
 
      // Save canvas to root file
      if (m_outFile) {
        createDirectory(m_outFile,dirName);  // now we are in dirName
        m_can->Write();
      }
 
      if (hdiff) delete hdiff;
    }
  }
  else if (obj->IsA()->InheritsFrom("TEfficiency")) {
    auto h = static_cast<TEfficiency*>(obj.get());
    auto href = static_cast<TEfficiency*>(refObj);
    Bool_t match = compareHist(*h->GetTotalHistogram(),*href->GetTotalHistogram()) &&
      compareHist(*h->GetPassedHistogram(),*href->GetPassedHistogram());
    m_histTotal++;
 
    // We only count (mis)matches but do not draw the difference for TEfficiency (yet)
    if (match) m_histMatch++;
    else m_noMatch.push_back(keyPath.Data());
  }
}
 
 
Bool_t TRootCompare::setReferenceFile(const char* filename,
                                    const char* baseDir)
{
  if (filename==0) {
    cout << "Invalid file name" << endl;
    return kFALSE;
  }
  
  m_refFile = new TFile(filename);
  if (m_refFile->IsZombie()) {
    cout << "Cannot open reference file " << filename << endl;
    delete m_refFile;
    m_refFile = 0;
    return kFALSE;
  }
 
  m_refRootDir = baseDir;
  return kTRUE;
}
 
 
Bool_t TRootCompare::setOutputFile(const char* filename)
{
  if (filename==0) {
    cout << "Invalid file name" << endl;
    return kFALSE;
  }
 
  m_outFile = new TFile(filename,"recreate");
  if (m_outFile->IsZombie()) {
    cout << "Cannot open file " << filename << endl;
    delete m_outFile;
    m_outFile = 0;
    return kFALSE;
  }
  return kTRUE;
}
 
Bool_t TRootCompare::setPsFile(const char* filename)
{
  if (filename==0) {
    cout << "Invalid file name" << endl;
    return kFALSE;
  }
  m_psFile = filename;
  return kTRUE;
}
 
void TRootCompare::printCanvas(const char* filename)
{
  if (m_can==0) return;
  if (filename==0) return;
 
  if (TString(filename).EndsWith(".ps"))
    m_can->Print(filename,"Landscape");
  else
    m_can->Print(filename);
}
 
 
Bool_t TRootCompare::compareHist(const TH1& h, const TH1& href)
{
  Bool_t result = kTRUE;
  
  if (verbose()) {
    cout << "Comparing " << h.GetName() << " using ";
  }
  
  if (m_alg==TRootCompare::BIN) {
    if (verbose()) cout << "BIN: ";
 
    if (h.GetNbinsX()!=href.GetNbinsX() || 
        h.GetNbinsY()!=href.GetNbinsY() || 
        h.GetNbinsZ()!=href.GetNbinsZ()) {
      cout << h.GetName() << " has different number of bins: (" 
           << h.GetNbinsX() << "," << h.GetNbinsY() << "," << h.GetNbinsZ() << ") vs ("
           << href.GetNbinsX() << "," << href.GetNbinsY() << "," << href.GetNbinsZ() << ")" << endl;
    }
 
    // This will work for histograms of all dimensions
    for (Int_t z=1; z<=h.GetNbinsZ() && result; z++) {
      for (Int_t y=1; y<=h.GetNbinsY() && result; y++) {
        for (Int_t x=1; x<=h.GetNbinsX() && result; x++) {
          Double_t binDiff = fabs(h.GetBinContent(x,y,z)-href.GetBinContent(x,y,z));
          if (binDiff>m_threshold) {
            result = kFALSE;
          }
        }
      }
    }
  }
  else if (m_alg==TRootCompare::AXIS) {
    if (verbose()) cout << "AXIS: ";
    const TAxis *xa(h.GetXaxis()), *xaref(href.GetXaxis());
    const TAxis *ya(h.GetXaxis()), *yaref(href.GetXaxis());
    const TAxis *za(h.GetXaxis()), *zaref(href.GetXaxis());
    if( xa->GetNbins() != xaref->GetNbins() ) result = kFALSE;
    if( result && (ya->GetNbins() != yaref->GetNbins()) ) result = kFALSE;
    if( result && (za->GetNbins() != zaref->GetNbins()) ) result = kFALSE;
    if( result && (fabs( xa->GetBinLowEdge(0) - xaref->GetBinLowEdge(0) ) > m_threshold ) ) result = kFALSE;
    if( result && (fabs( ya->GetBinLowEdge(0) - yaref->GetBinLowEdge(0) ) > m_threshold ) ) result = kFALSE;
    if( result && (fabs( za->GetBinLowEdge(0) - zaref->GetBinLowEdge(0) ) > m_threshold ) ) result = kFALSE;
    if( result ) for (Int_t i=0; i<=xa->GetNbins() && result; i++)
       if( fabs (xa->GetBinUpEdge(i) - xaref->GetBinUpEdge(i)) > m_threshold ) result = kFALSE;
    if( result ) for (Int_t i=0; i<=ya->GetNbins() && result; i++)
       if( fabs (ya->GetBinUpEdge(i) - yaref->GetBinUpEdge(i)) > m_threshold ) result = kFALSE;
    if( result ) for (Int_t i=0; i<=za->GetNbins() && result; i++)
       if( fabs (za->GetBinUpEdge(i) - zaref->GetBinUpEdge(i)) > m_threshold ) result = kFALSE;
  }
  else if (m_alg==TRootCompare::CHI2) {
    if (verbose()) cout << "CHI2: ";
    
    // Don't compare empty histograms
    if (h.GetEntries()==0 && href.GetEntries()==0) result = kTRUE;  // both empty
    else if (h.Integral()==0 && href.Integral()==0) result = kTRUE; // both empty
    else if (h.Integral()*href.Integral()==0) result = kFALSE;      // one empty
    else {
      Double_t chi2;
      Int_t igood;
      Int_t ndf;
      Double_t p = h.Chi2TestX(&href,chi2,ndf,igood);
      // this is because of a bug in root
      if (ndf==0) result = kTRUE;
      else if (p>m_threshold) result = kTRUE;
      else result = kFALSE;
    }
  }  
  else {
    cout << "ERROR: Invalid algorithm." << endl;
  }
 
  if (verbose()) cout << result << endl;
  return result;
}
 
// sort histogram axes and deflate
void TRootCompare::sortAndDeflate(TH1& h)
{
  if (h.GetXaxis()->IsAlphanumeric()) {
    h.GetXaxis()->LabelsOption("a");
    h.LabelsDeflate("X");
  }
  if (h.GetYaxis()->IsAlphanumeric()) {
    h.GetYaxis()->LabelsOption("a");
    h.LabelsDeflate("Y");
  }
}
 
// Create all directories in dirpath
void TRootCompare::createDirectory(TFile* f, const char* dirpath)
{
  if ((f==0) || (dirpath==0)) return;
 
  f->cd();
  TString s(dirpath);
  TObjArray* a = s.Tokenize("/");
  for (int i=0; i<a->GetEntries(); i++) {
    const char* dir = a->At(i)->GetName();
    if (gDirectory->GetDirectory(dir)==0) gDirectory->mkdir(dir); // create if it doesn't exist
    gDirectory->cd(dir);
  }
  
}