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// A JetEvent emulates 2 detectors A and B producing each
// a TClonesArray of Hit objects.
// A TClonesArray of Track objects is built with Hits objects
// of detectors A and B. Eack Track object has a TRefArray of hits.
// A TClonesArray of Jets is made with a subset of the Track objects
// also stored in a TRefArray.
// see $ROOTSYS/tutorials/jets.C for an example creating a Tree
// with JetEvents.
#include "TMath.h"
#include "TRandom.h"
#include "JetEvent.h"
ClassImp(Jet)
ClassImp(Track)
ClassImp(Hit)
ClassImp(JetEvent)
TClonesArray *JetEvent::fgJets = 0;
TClonesArray *JetEvent::fgTracks = 0;
TClonesArray *JetEvent::fgHitsA = 0;
TClonesArray *JetEvent::fgHitsB = 0;
//______________________________________________________________________________
JetEvent::JetEvent()
{
// Create a JetEvent object.
// When the constructor is invoked for the first time, the class static
// variables fgxxx are 0 and the TClonesArray fgxxx are created.
if (!fgTracks) fgTracks = new TClonesArray("Track", 100);
if (!fgJets) fgJets = new TClonesArray("Jet", 10);
if (!fgHitsA) fgHitsA = new TClonesArray("Hit", 10000);
if (!fgHitsB) fgHitsB = new TClonesArray("Hit", 1000);
fJets = fgJets;
fTracks = fgTracks;
fHitsA = fgHitsA;
fHitsB = fgHitsB;
}
//______________________________________________________________________________
JetEvent::~JetEvent()
{
Reset();
}
//______________________________________________________________________________
void JetEvent::Build(Int_t jetm, Int_t trackm, Int_t hitam, Int_t hitbm) {
//Build one event
//Save current Object count
Int_t ObjectNumber = TProcessID::GetObjectCount();
Clear();
Hit *hit;
Track *track;
Jet *jet;
fNjet = fNtrack = fNhitA = fNhitB = 0;
fVertex.SetXYZ(gRandom->Gaus(0,0.1),
gRandom->Gaus(0,0.2),
gRandom->Gaus(0,10));
Int_t njets = (Int_t)gRandom->Gaus(jetm,1); if (njets < 1) njets = 1;
for (Int_t j=0;j<njets;j++) {
jet = AddJet();
jet->fPt = gRandom->Gaus(0,10);
jet->fPhi = 2*TMath::Pi()*gRandom->Rndm();
Int_t ntracks = (Int_t)gRandom->Gaus(trackm,3); if (ntracks < 1) ntracks = 1;
for (Int_t t=0;t<ntracks;t++) {
track = AddTrack();
track->fPx = gRandom->Gaus(0,1);
track->fPy = gRandom->Gaus(0,1);
track->fPz = gRandom->Gaus(0,5);
jet->fTracks.Add(track);
Int_t nhitsA = (Int_t)gRandom->Gaus(hitam,5);
for (Int_t ha=0;ha<nhitsA;ha++) {
hit = AddHitA();
hit->fX = 10000*j + 100*t +ha;
hit->fY = 10000*j + 100*t +ha+0.1;
hit->fZ = 10000*j + 100*t +ha+0.2;
track->fHits.Add(hit);
}
Int_t nhitsB = (Int_t)gRandom->Gaus(hitbm,2);
for (Int_t hb=0;hb<nhitsB;hb++) {
hit = AddHitB();
hit->fX = 20000*j + 100*t +hb+0.3;
hit->fY = 20000*j + 100*t +hb+0.4;
hit->fZ = 20000*j + 100*t +hb+0.5;
track->fHits.Add(hit);
}
track->fNhit = nhitsA + nhitsB;
}
}
//Restore Object count
//To save space in the table keeping track of all referenced objects
//we assume that our events do not address each other. We reset the
//object count to what it was at the beginning of the event.
TProcessID::SetObjectCount(ObjectNumber);
}
//______________________________________________________________________________
Jet *JetEvent::AddJet()
{
// Add a new Jet to the list of tracks for this event.
TClonesArray &jets = *fJets;
Jet *jet = new(jets[fNjet++]) Jet();
return jet;
}
//______________________________________________________________________________
Track *JetEvent::AddTrack()
{
// Add a new track to the list of tracks for this event.
TClonesArray &tracks = *fTracks;
Track *track = new(tracks[fNtrack++]) Track();
return track;
}
//______________________________________________________________________________
Hit *JetEvent::AddHitA()
{
// Add a new hit to the list of hits in detector A
TClonesArray &hitsA = *fHitsA;
Hit *hit = new(hitsA[fNhitA++]) Hit();
return hit;
}
//______________________________________________________________________________
Hit *JetEvent::AddHitB()
{
// Add a new hit to the list of hits in detector B
TClonesArray &hitsB = *fHitsB;
Hit *hit = new(hitsB[fNhitB++]) Hit();
return hit;
}
//______________________________________________________________________________
void JetEvent::Clear(Option_t *option)
{
fJets->Clear(option);
fTracks->Clear(option);
fHitsA->Clear(option);
fHitsB->Clear(option);
}
//______________________________________________________________________________
void JetEvent::Reset(Option_t *)
{
// Static function to reset all static objects for this event
delete fgJets; fgJets = 0;
delete fgTracks; fgTracks = 0;
delete fgHitsA; fgHitsA = 0;
delete fgHitsB; fgHitsB = 0;
}
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