From 8582d3345bc7859a5645a7926f9bdee95727da37 Mon Sep 17 00:00:00 2001
From: Whitney Armstrong <warmstrong@anl.gov>
Date: Mon, 20 Jul 2020 16:28:46 -0500
Subject: [PATCH] new file: results/.gitignore renamed:
neutrons_zdc.cxx -> zdc_neutrons.cxx new file: zdc_neutrons_reader.cxx
---
results/.gitignore | 0
neutrons_zdc.cxx => zdc_neutrons.cxx | 0
zdc_neutrons_reader.cxx | 44 ++++++++++++++++++++++++++++
3 files changed, 44 insertions(+)
create mode 100644 results/.gitignore
rename neutrons_zdc.cxx => zdc_neutrons.cxx (100%)
create mode 100644 zdc_neutrons_reader.cxx
diff --git a/results/.gitignore b/results/.gitignore
new file mode 100644
index 0000000..e69de29
diff --git a/neutrons_zdc.cxx b/zdc_neutrons.cxx
similarity index 100%
rename from neutrons_zdc.cxx
rename to zdc_neutrons.cxx
diff --git a/zdc_neutrons_reader.cxx b/zdc_neutrons_reader.cxx
new file mode 100644
index 0000000..d6e8c5e
--- /dev/null
+++ b/zdc_neutrons_reader.cxx
@@ -0,0 +1,44 @@
+#include "HepMC3/GenEvent.h"
+#include "HepMC3/ReaderAscii.h"
+#include "HepMC3/WriterAscii.h"
+#include "HepMC3/Print.h"
+
+#include "TH1F.h"
+#include <iostream>
+using namespace HepMC3;
+
+void zdc_neutrons_reader(){
+
+ //-------------------------------------
+ ReaderAscii hepmc_input("data/neutrons_zdc.hepmc");
+ int events_parsed = 0;
+ GenEvent evt(Units::GEV, Units::MM);
+
+ TH1F* h_neutron_energy = new TH1F("n energy","; E [GeV]",100,0,200);
+
+ while(!hepmc_input.failed()) {
+ // Read event from input file
+ hepmc_input.read_event(evt);
+
+ // If reading failed - exit loop
+ if( hepmc_input.failed() ) break;
+
+ for(const auto& v : evt.vertices() ) {
+ for(const auto& p : v->particles_out() ) {
+ if(p->pid() == 2112) {
+ h_neutron_energy->Fill(p->momentum().e());
+ }
+ }
+ }
+ evt.clear();
+ events_parsed++;
+ }
+ std::cout << "Events parsed and written: " << events_parsed << std::endl;
+
+ TCanvas* c = new TCanvas();
+ h_neutron_energy->Draw();
+ c->SaveAs("results/zdc_neutrons_reader.png");
+ c->SaveAs("results/zdc_neutrons_reader.pdf");
+}
+
+
--
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