[u/mrichter/AliRoot.git] / EVGEN / AliGenExtFile.cxx

/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/

/* $Id$ */

// Event generator that using an instance of type AliGenReader
// reads particles from a file and applies cuts.
// Example: In your Config.C you can include the following lines
//  AliGenExtFile *gener = new AliGenExtFile(-1);
//  gener->SetMomentumRange(0,999);
//  gener->SetPhiRange(-180.,180.);
//  gener->SetThetaRange(0,180);
//  gener->SetYRange(-999,999);
//  AliGenReaderTreeK * reader = new AliGenReaderTreeK();
//  reader->SetFileName("myFileWithTreeK.root");
//  gener->SetReader(reader);
//  gener->Init();


#include <Riostream.h>

#include "AliLog.h"
#include "AliGenExtFile.h"
#include "AliRunLoader.h"
#include "AliHeader.h"
#include "AliStack.h"
#include "AliGenEventHeader.h"
#include "AliGenReader.h"

#include <TParticle.h>
#include <TFile.h>
#include <TTree.h>


using std::cout;
using std::endl;
using std::map;

ClassImp(AliGenExtFile)

AliGenExtFile::AliGenExtFile()
    :AliGenMC(),
     fFileName(0),
     fReader(0),
     fStartEvent(0)
{
//  Constructor
//
//  Read all particles
    fNpart  = -1;
}

AliGenExtFile::AliGenExtFile(Int_t npart)
    :AliGenMC(npart),
     fFileName(0),
     fReader(0),
     fStartEvent(0)
{
//  Constructor
    fName   = "ExtFile";
    fTitle  = "Primaries from ext. File";
}

//____________________________________________________________
AliGenExtFile::~AliGenExtFile()
{
// Destructor
    delete fReader;
}

//___________________________________________________________
void AliGenExtFile::Init()
{
// Initialize
    if (fReader) fReader->Init();
}

//___________________________________________________________
void AliGenExtFile::Generate()
{
// Generate particles

  Double_t polar[3]  = {0,0,0};
  //
  Double_t origin[3] = {0,0,0};
  Double_t time = 0.;
  Double_t p[4];
  Float_t random[6];
  Int_t i=0, j, nt;
  //
  //
  if (fVertexSmear == kPerEvent) Vertex();

  // Fast forward up to start Event
  for (Int_t ie=0; ie<fStartEvent; ++ie ) {
    Int_t nTracks = fReader->NextEvent(); 	
    if (nTracks == 0) {
      // printf("\n No more events !!! !\n");
      Warning("AliGenExtFile::Generate","\nNo more events in external file!!!\nLast event may be empty or incomplete.\n");
      return;
    }
    for (i = 0; i < nTracks; ++i) {
      if (NULL == fReader->NextParticle())
	AliFatal("Error while skipping tracks");
    }
    cout << "Skipping event " << ie << endl;
  }  
  fStartEvent = 0; // do not skip events the second time 

  while(1) {
    Int_t nTracks = fReader->NextEvent(); 	
    if (nTracks == 0) {
      // printf("\n No more events !!! !\n");
      Warning("AliGenExtFile::Generate","\nNo more events in external file!!!\nLast event may be empty or incomplete.\n");
      return;
    }

    //
    // Particle selection loop
    //
    // The selection criterium for the external file generator is as follows:
    //
    // 1) All tracks are subject to the cuts defined by AliGenerator, i.e.
    //    fThetaMin, fThetaMax, fPhiMin, fPhiMax, fPMin, fPMax, fPtMin, fPtMax,
    //    fYMin, fYMax.
    //    If the particle does not satisfy these cuts, it is not put on the
    //    stack.
    // 2) If fCutOnChild and some specific child is selected (e.g. if
    //    fForceDecay==kSemiElectronic) the event is rejected if NOT EVEN ONE
    //    child falls into the child-cuts.
    TParticle* iparticle = 0x0;
    
    if(fCutOnChild) {
      // Count the selected children
      Int_t nSelected = 0;
      while ((iparticle=fReader->NextParticle()) ) {
	  Int_t kf = CheckPDGCode(iparticle->GetPdgCode());
	  kf = TMath::Abs(kf);
	  if (ChildSelected(kf) && KinematicSelection(iparticle, 1)) {
	      nSelected++;
	  }
      }
      if (!nSelected) continue;    // No particle selected:  Go to next event
      fReader->RewindEvent();
    }

    //
    // Stack selection loop
    //
    class SelectorLogic { // need to do recursive back tracking, requires a "nested" function
    private:
       Int_t idCount;
       map<Int_t,Int_t> firstMotherMap;
       map<Int_t,Int_t> secondMotherMap;
       map<Int_t,Bool_t> selectedIdMap;
       map<Int_t,Int_t> newIdMap;
       void selectMothersToo(Int_t particleId) {
	 Int_t mum1 = firstMotherMap[particleId];
          if (mum1 > -1 && !selectedIdMap[mum1]) {
             selectedIdMap[mum1] = true;
             selectMothersToo(mum1);
          }
          Int_t mum2 = secondMotherMap[particleId];
          if (mum2 > -1 && !selectedIdMap[mum2]) {
             selectedIdMap[mum2] = true;
             selectMothersToo(mum2);
          }
       }
    public:
      SelectorLogic():idCount(0), firstMotherMap(), secondMotherMap(), selectedIdMap(), newIdMap() {}
      void init() {
          idCount = 0;
       }
       void setData(Int_t id, Int_t mum1, Int_t mum2, Bool_t selected) {
          idCount++; // we know that this function is called in succession of ids, so counting is fine to determine max id
          firstMotherMap[id] = mum1;
          secondMotherMap[id] = mum2;
          selectedIdMap[id] = selected;
       }
       void reselectCuttedMothersAndRemapIDs() {
          for (Int_t id = 0; id < idCount; ++id) {
             if (selectedIdMap[id]) {
                selectMothersToo(id);
             }
          }
          Int_t newId0 = 0;
          for (Int_t id = 0; id < idCount; id++) {
             if (selectedIdMap[id]) {
                newIdMap[id] = newId0; ++newId0;
             } else {
                newIdMap[id] = -1;
             }
          }
       }
       Bool_t isSelected(Int_t id) {
          return selectedIdMap[id];
       }
       Int_t newId(Int_t id) {
          if (id == -1) return -1;
          return newIdMap[id];
       }
    };
    SelectorLogic selector;
    selector.init();
    for (i = 0; i < nTracks; i++) {
       TParticle* jparticle = fReader->NextParticle();
       selector.setData(i,
             jparticle->GetFirstMother(),
             jparticle->GetSecondMother(),
             KinematicSelection(jparticle,0));
    }
    selector.reselectCuttedMothersAndRemapIDs();
    fReader->RewindEvent();

    //
    // Stack filling loop
    //
    fNprimaries = 0;
    for (i = 0; i < nTracks; i++) {
       TParticle* jparticle = fReader->NextParticle();
       Bool_t selected = selector.isSelected(i);
       if (!selected) {
          continue;
       }
       Int_t parent = selector.newId(jparticle->GetFirstMother());
//       printf("particle %d -> %d, with mother %d -> %d\n", i, selector.newId(i), jparticle->GetFirstMother(), parent);

	p[0] = jparticle->Px();
	p[1] = jparticle->Py();
	p[2] = jparticle->Pz();
	p[3] = jparticle->Energy();
	
	Int_t idpart = jparticle->GetPdgCode();
	if(fVertexSmear==kPerTrack) 
	{
	    Rndm(random,6);
	    for (j = 0; j < 3; j++) {
		origin[j]=fOrigin[j]+
		    fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
		    TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
	    }
	    Rndm(random,2);
	    time = fTimeOrigin + fOsigma[2]/TMath::Ccgs()*
	      TMath::Cos(2*random[0]*TMath::Pi())*
	      TMath::Sqrt(-2*TMath::Log(random[1]));
	} else {
	    origin[0] = fVertex[0] + jparticle->Vx();
	    origin[1] = fVertex[1] + jparticle->Vy();
	    origin[2] = fVertex[2] + jparticle->Vz();
	    time = fTime + jparticle->T();
	}
	Int_t doTracking = fTrackIt && selected && (jparticle->TestBit(kTransportBit));
	
	PushTrack(doTracking, parent, idpart,
		  p[0], p[1], p[2], p[3], origin[0], origin[1], origin[2], time,
		  polar[0], polar[1], polar[2],
		  kPPrimary, nt, 1., jparticle->GetStatusCode());

	KeepTrack(nt);
	fNprimaries++;
    } // track loop

    // Generated event header
    AliGenEventHeader * header = fReader->GetGenEventHeader();
    if (!header) header = new AliGenEventHeader();
    header->SetNProduced(fNprimaries);
    header->SetPrimaryVertex(fVertex);
    header->SetInteractionTime(fTime);
    AddHeader(header);
    break;
    
  } // event loop
  
  SetHighWaterMark(nt);
  CdEventFile();
}

//___________________________________________________________
void AliGenExtFile::CdEventFile()
{
// CD back to the event file
  AliRunLoader::Instance()->CdGAFile();
}
Commit	Line	Data
	1	/**************************************************************************
	2	* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
	3	* *
	4	* Author: The ALICE Off-line Project. *
	5	* Contributors are mentioned in the code where appropriate. *
	6	* *
	7	* Permission to use, copy, modify and distribute this software and its *
	8	* documentation strictly for non-commercial purposes is hereby granted *
	9	* without fee, provided that the above copyright notice appears in all *
	10	* copies and that both the copyright notice and this permission notice *
	11	* appear in the supporting documentation. The authors make no claims *
	12	* about the suitability of this software for any purpose. It is *
	13	* provided "as is" without express or implied warranty. *
	14	**************************************************************************/
	15
	16	/* $Id$ */
	17
	18	// Event generator that using an instance of type AliGenReader
	19	// reads particles from a file and applies cuts.
	20	// Example: In your Config.C you can include the following lines
	21	// AliGenExtFile *gener = new AliGenExtFile(-1);
	22	// gener->SetMomentumRange(0,999);
	23	// gener->SetPhiRange(-180.,180.);
	24	// gener->SetThetaRange(0,180);
	25	// gener->SetYRange(-999,999);
	26	// AliGenReaderTreeK * reader = new AliGenReaderTreeK();
	27	// reader->SetFileName("myFileWithTreeK.root");
	28	// gener->SetReader(reader);
	29	// gener->Init();
	30
	31
	32	#include <Riostream.h>
	33
	34	#include "AliLog.h"
	35	#include "AliGenExtFile.h"
	36	#include "AliRunLoader.h"
	37	#include "AliHeader.h"
	38	#include "AliStack.h"
	39	#include "AliGenEventHeader.h"
	40	#include "AliGenReader.h"
	41
	42	#include <TParticle.h>
	43	#include <TFile.h>
	44	#include <TTree.h>
	45
	46
	47	using std::cout;
	48	using std::endl;
	49	using std::map;
	50
	51	ClassImp(AliGenExtFile)
	52
	53	AliGenExtFile::AliGenExtFile()
	54	:AliGenMC(),
	55	fFileName(0),
	56	fReader(0),
	57	fStartEvent(0)
	58	{
	59	// Constructor
	60	//
	61	// Read all particles
	62	fNpart = -1;
	63	}
	64
	65	AliGenExtFile::AliGenExtFile(Int_t npart)
	66	:AliGenMC(npart),
	67	fFileName(0),
	68	fReader(0),
	69	fStartEvent(0)
	70	{
	71	// Constructor
	72	fName = "ExtFile";
	73	fTitle = "Primaries from ext. File";
	74	}
	75
	76	//____________________________________________________________
	77	AliGenExtFile::~AliGenExtFile()
	78	{
	79	// Destructor
	80	delete fReader;
	81	}
	82
	83	//___________________________________________________________
	84	void AliGenExtFile::Init()
	85	{
	86	// Initialize
	87	if (fReader) fReader->Init();
	88	}
	89
	90	//___________________________________________________________
	91	void AliGenExtFile::Generate()
	92	{
	93	// Generate particles
	94
	95	Double_t polar[3] = {0,0,0};
	96	//
	97	Double_t origin[3] = {0,0,0};
	98	Double_t time = 0.;
	99	Double_t p[4];
	100	Float_t random[6];
	101	Int_t i=0, j, nt;
	102	//
	103	//
	104	if (fVertexSmear == kPerEvent) Vertex();
	105
	106	// Fast forward up to start Event
	107	for (Int_t ie=0; ie<fStartEvent; ++ie ) {
	108	Int_t nTracks = fReader->NextEvent();
	109	if (nTracks == 0) {
	110	// printf("\n No more events !!! !\n");
	111	Warning("AliGenExtFile::Generate","\nNo more events in external file!!!\nLast event may be empty or incomplete.\n");
	112	return;
	113	}
	114	for (i = 0; i < nTracks; ++i) {
	115	if (NULL == fReader->NextParticle())
	116	AliFatal("Error while skipping tracks");
	117	}
	118	cout << "Skipping event " << ie << endl;
	119	}
	120	fStartEvent = 0; // do not skip events the second time
	121
	122	while(1) {
	123	Int_t nTracks = fReader->NextEvent();
	124	if (nTracks == 0) {
	125	// printf("\n No more events !!! !\n");
	126	Warning("AliGenExtFile::Generate","\nNo more events in external file!!!\nLast event may be empty or incomplete.\n");
	127	return;
	128	}
	129
	130	//
	131	// Particle selection loop
	132	//
	133	// The selection criterium for the external file generator is as follows:
	134	//
	135	// 1) All tracks are subject to the cuts defined by AliGenerator, i.e.
	136	// fThetaMin, fThetaMax, fPhiMin, fPhiMax, fPMin, fPMax, fPtMin, fPtMax,
	137	// fYMin, fYMax.
	138	// If the particle does not satisfy these cuts, it is not put on the
	139	// stack.
	140	// 2) If fCutOnChild and some specific child is selected (e.g. if
	141	// fForceDecay==kSemiElectronic) the event is rejected if NOT EVEN ONE
	142	// child falls into the child-cuts.
	143	TParticle* iparticle = 0x0;
	144
	145	if(fCutOnChild) {
	146	// Count the selected children
	147	Int_t nSelected = 0;
	148	while ((iparticle=fReader->NextParticle()) ) {
	149	Int_t kf = CheckPDGCode(iparticle->GetPdgCode());
	150	kf = TMath::Abs(kf);
	151	if (ChildSelected(kf) && KinematicSelection(iparticle, 1)) {
	152	nSelected++;
	153	}
	154	}
	155	if (!nSelected) continue; // No particle selected: Go to next event
	156	fReader->RewindEvent();
	157	}
	158
	159	//
	160	// Stack selection loop
	161	//
	162	class SelectorLogic { // need to do recursive back tracking, requires a "nested" function
	163	private:
	164	Int_t idCount;
	165	map<Int_t,Int_t> firstMotherMap;
	166	map<Int_t,Int_t> secondMotherMap;
	167	map<Int_t,Bool_t> selectedIdMap;
	168	map<Int_t,Int_t> newIdMap;
	169	void selectMothersToo(Int_t particleId) {
	170	Int_t mum1 = firstMotherMap[particleId];
	171	if (mum1 > -1 && !selectedIdMap[mum1]) {
	172	selectedIdMap[mum1] = true;
	173	selectMothersToo(mum1);
	174	}
	175	Int_t mum2 = secondMotherMap[particleId];
	176	if (mum2 > -1 && !selectedIdMap[mum2]) {
	177	selectedIdMap[mum2] = true;
	178	selectMothersToo(mum2);
	179	}
	180	}
	181	public:
	182	SelectorLogic():idCount(0), firstMotherMap(), secondMotherMap(), selectedIdMap(), newIdMap() {}
	183	void init() {
	184	idCount = 0;
	185	}
	186	void setData(Int_t id, Int_t mum1, Int_t mum2, Bool_t selected) {
	187	idCount++; // we know that this function is called in succession of ids, so counting is fine to determine max id
	188	firstMotherMap[id] = mum1;
	189	secondMotherMap[id] = mum2;
	190	selectedIdMap[id] = selected;
	191	}
	192	void reselectCuttedMothersAndRemapIDs() {
	193	for (Int_t id = 0; id < idCount; ++id) {
	194	if (selectedIdMap[id]) {
	195	selectMothersToo(id);
	196	}
	197	}
	198	Int_t newId0 = 0;
	199	for (Int_t id = 0; id < idCount; id++) {
	200	if (selectedIdMap[id]) {
	201	newIdMap[id] = newId0; ++newId0;
	202	} else {
	203	newIdMap[id] = -1;
	204	}
	205	}
	206	}
	207	Bool_t isSelected(Int_t id) {
	208	return selectedIdMap[id];
	209	}
	210	Int_t newId(Int_t id) {
	211	if (id == -1) return -1;
	212	return newIdMap[id];
	213	}
	214	};
	215	SelectorLogic selector;
	216	selector.init();
	217	for (i = 0; i < nTracks; i++) {
	218	TParticle* jparticle = fReader->NextParticle();
	219	selector.setData(i,
	220	jparticle->GetFirstMother(),
	221	jparticle->GetSecondMother(),
	222	KinematicSelection(jparticle,0));
	223	}
	224	selector.reselectCuttedMothersAndRemapIDs();
	225	fReader->RewindEvent();
	226
	227	//
	228	// Stack filling loop
	229	//
	230	fNprimaries = 0;
	231	for (i = 0; i < nTracks; i++) {
	232	TParticle* jparticle = fReader->NextParticle();
	233	Bool_t selected = selector.isSelected(i);
	234	if (!selected) {
	235	continue;
	236	}
	237	Int_t parent = selector.newId(jparticle->GetFirstMother());
	238	// printf("particle %d -> %d, with mother %d -> %d\n", i, selector.newId(i), jparticle->GetFirstMother(), parent);
	239
	240	p[0] = jparticle->Px();
	241	p[1] = jparticle->Py();
	242	p[2] = jparticle->Pz();
	243	p[3] = jparticle->Energy();
	244
	245	Int_t idpart = jparticle->GetPdgCode();
	246	if(fVertexSmear==kPerTrack)
	247	{
	248	Rndm(random,6);
	249	for (j = 0; j < 3; j++) {
	250	origin[j]=fOrigin[j]+
	251	fOsigma[j]TMath::Cos(2random[2j]TMath::Pi())*
	252	TMath::Sqrt(-2TMath::Log(random[2j+1]));
	253	}
	254	Rndm(random,2);
	255	time = fTimeOrigin + fOsigma[2]/TMath::Ccgs()*
	256	TMath::Cos(2random[0]TMath::Pi())*
	257	TMath::Sqrt(-2*TMath::Log(random[1]));
	258	} else {
	259	origin[0] = fVertex[0] + jparticle->Vx();
	260	origin[1] = fVertex[1] + jparticle->Vy();
	261	origin[2] = fVertex[2] + jparticle->Vz();
	262	time = fTime + jparticle->T();
	263	}
	264	Int_t doTracking = fTrackIt && selected && (jparticle->TestBit(kTransportBit));
	265
	266	PushTrack(doTracking, parent, idpart,
	267	p[0], p[1], p[2], p[3], origin[0], origin[1], origin[2], time,
	268	polar[0], polar[1], polar[2],
	269	kPPrimary, nt, 1., jparticle->GetStatusCode());
	270
	271	KeepTrack(nt);
	272	fNprimaries++;
	273	} // track loop
	274
	275	// Generated event header
	276	AliGenEventHeader * header = fReader->GetGenEventHeader();
	277	if (!header) header = new AliGenEventHeader();
	278	header->SetNProduced(fNprimaries);
	279	header->SetPrimaryVertex(fVertex);
	280	header->SetInteractionTime(fTime);
	281	AddHeader(header);
	282	break;
	283
	284	} // event loop
	285
	286	SetHighWaterMark(nt);
	287	CdEventFile();
	288	}
	289
	290	//___________________________________________________________
	291	void AliGenExtFile::CdEventFile()
	292	{
	293	// CD back to the event file
	294	AliRunLoader::Instance()->CdGAFile();
	295	}
	296
	297
	298
	299
	300