| 1 | /*
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| 2 | Write this to the Terminal
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| 3 | root -l examples/Example2.C'("delphes_output.root")'
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| 4 | */
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| 5 |
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| 6 | #include "TH1.h"
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| 7 | #include "TSystem.h"
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| 8 |
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| 9 | #ifdef __CLING__
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| 10 | R__LOAD_LIBRARY(libDelphes)
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| 11 | #include "classes/DelphesClasses.h"
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| 12 | #include "external/ExRootAnalysis/ExRootTreeReader.h"
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| 13 | #include "external/ExRootAnalysis/ExRootResult.h"
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| 14 | #endif
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| 15 |
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| 16 | //------------------------------------------------------------------------------
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| 17 |
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| 18 | struct MyPlots
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| 19 | {
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| 20 | TH1 *ParticlePT;
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| 21 | };
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| 22 |
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| 23 | //------------------------------------------------------------------------------
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| 24 |
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| 25 | class ExRootResult;
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| 26 | class ExRootTreeReader;
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| 27 |
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| 28 | //------------------------------------------------------------------------------
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| 29 |
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| 30 | void BookHistograms(ExRootResult *result, MyPlots *plots)
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| 31 | {
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| 32 | THStack *stack;
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| 33 | TLegend *legend;
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| 34 | TPaveText *comment;
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| 35 |
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| 36 |
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| 37 | // book more histograms
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| 38 |
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| 39 | plots->fParticlePT = result->AddHist1D(
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| 40 | "electron_pt", "electron P_{T}",
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| 41 | "electron P_{T}, GeV/c", "number of electrons",
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| 42 | 50, 0.0, 100.0);
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| 43 |
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| 44 | // book general comment
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| 45 |
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| 46 | comment = result->AddComment(0.64, 0.86, 0.98, 0.98);
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| 47 | comment->AddText("demonstration plot");
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| 48 | comment->AddText("produced by Example2.C");
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| 49 |
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| 50 | result->Attach(plots->fParticlePT, comment);
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| 51 |
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| 52 | }
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| 53 |
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| 54 | //------------------------------------------------------------------------------
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| 55 |
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| 56 | void AnalyseEvents(ExRootTreeReader *treeReader, MyPlots *plots)
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| 57 | {
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| 58 | TClonesArray *branchParticle = treeReader->UseBranch("Particle");
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| 59 |
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| 60 | Long64_t allEntries = treeReader->GetEntries();
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| 61 |
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| 62 | cout << "** Chain contains " << allEntries << " events" << endl;
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| 63 |
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| 64 | Particle *particle;
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| 65 |
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| 66 | Long64_t entry;
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| 67 |
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| 68 | Int_t i;
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| 69 |
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| 70 | // Loop over all events
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| 71 | for(entry = 0; entry < allEntries; ++entry)
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| 72 | {
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| 73 | // Load selected branches with data from specified event
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| 74 | treeReader->ReadEntry(entry);
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| 75 |
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| 76 | // Loop over all electrons in event
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| 77 | for(i = 0; i < branchParticle->GetEntriesFast(); ++i)
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| 78 | {
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| 79 | particle = (Particle*) branchParticle->At(i);
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| 80 | plots->fParticlePT->Fill(particle->PT);
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| 81 | }
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| 82 | }
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| 83 | }
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| 84 |
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| 85 | //------------------------------------------------------------------------------
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| 86 |
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| 87 | void PrintHistograms(ExRootResult *result, MyPlots *plots)
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| 88 | {
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| 89 | result->Print("png");
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| 90 | }
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| 91 |
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| 92 | //------------------------------------------------------------------------------
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| 93 |
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| 94 | void Example2(const char *inputFile)
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| 95 | {
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| 96 | gSystem->Load("libDelphes");
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| 97 |
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| 98 | TChain *chain = new TChain("Delphes");
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| 99 | chain->Add(inputFile);
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| 100 |
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| 101 | ExRootTreeReader *treeReader = new ExRootTreeReader(chain);
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| 102 | ExRootResult *result = new ExRootResult();
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| 103 |
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| 104 | MyPlots *plots = new MyPlots;
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| 105 |
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| 106 | BookHistograms(result, plots);
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| 107 |
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| 108 | AnalyseEvents(treeReader, plots);
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| 109 |
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| 110 | PrintHistograms(result, plots);
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| 111 |
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| 112 | // write into a root file.
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| 113 |
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| 114 | result->Write("result.root");
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| 115 |
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| 116 | cout << "** Exiting..." << endl;
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| 117 |
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| 118 | delete plots;
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| 119 | delete result;
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| 120 | delete treeReader;
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| 121 | delete chain;
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| 122 | }
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| 123 |
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| 124 | //------------------------------------------------------------------------------
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