1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
16 //_________________________________________________________________________
17 // Implementation version 1 of algorithm class to construct PHOS track segments
18 // Track segment for PHOS is list of
19 // EMC RecPoint + (possibly) CPV RecPoint + (possibly) PPSD RecPoint
20 // To find TrackSegments we do the following:
21 // for each EMC RecPoints we look at
22 // CPV/PPSD RecPoints in the radious fRcpv.
23 // If there is such a CPV RecPoint,
24 // we make "Link" it is just indexes of EMC and CPV/PPSD RecPoint and distance
25 // between them in the PHOS plane.
26 // Then we sort "Links" and starting from the
27 // least "Link" pointing to the unassined EMC and CPV RecPoints assing them to
29 // If there is no CPV/PPSD RecPoint we make TrackSegment
30 // consisting from EMC alone. There is no TrackSegments without EMC RecPoint.
31 //// In principle this class should be called from AliPHOSReconstructioner, but
32 // one can use it as well in standalone mode.
34 // root [0] AliPHOSTrackSegmentMakerv1 * t = new AliPHOSTrackSegmentMaker("galice.root", "tracksegmentsname", "recpointsname")
35 // Warning in <TDatabasePDG::TDatabasePDG>: object already instantiated
36 // // reads gAlice from header file "galice.root", uses recpoints stored in the branch names "recpointsname" (default = "Default")
37 // // and saves recpoints in branch named "tracksegmentsname" (default = "recpointsname")
38 // root [1] t->ExecuteTask()
39 // root [2] t->SetMaxEmcPpsdDistance(5)
40 // root [3] t->SetTrackSegmentsBranch("max distance 5 cm")
41 // root [4] t->ExecuteTask("deb all time")
43 //*-- Author: Dmitri Peressounko (RRC Ki & SUBATECH) & Yves Schutz (SUBATECH)
46 // --- ROOT system ---
48 #include "TBenchmark.h"
50 // --- Standard library ---
52 // --- AliRoot header files ---
53 #include "AliPHOSGeometry.h"
54 #include "AliPHOSTrackSegmentMakerv1.h"
55 #include "AliPHOSTrackSegment.h"
56 #include "AliPHOSLink.h"
57 #include "AliPHOSGetter.h"
59 #include "AliESDtrack.h"
61 ClassImp( AliPHOSTrackSegmentMakerv1)
64 //____________________________________________________________________________
65 AliPHOSTrackSegmentMakerv1::AliPHOSTrackSegmentMakerv1() : AliPHOSTrackSegmentMaker()
67 // default ctor (to be used mainly by Streamer)
70 fDefaultInit = kTRUE ;
73 //____________________________________________________________________________
74 AliPHOSTrackSegmentMakerv1::AliPHOSTrackSegmentMakerv1(const TString alirunFileName, const TString eventFolderName)
75 :AliPHOSTrackSegmentMaker(alirunFileName, eventFolderName)
81 fDefaultInit = kFALSE ;
85 //____________________________________________________________________________
86 AliPHOSTrackSegmentMakerv1::~AliPHOSTrackSegmentMakerv1()
89 // fDefaultInit = kTRUE if TrackSegmentMaker created by default ctor (to get just the parameters)
95 //____________________________________________________________________________
96 const TString AliPHOSTrackSegmentMakerv1::BranchName() const
102 //____________________________________________________________________________
103 void AliPHOSTrackSegmentMakerv1::FillOneModule()
105 // Finds first and last indexes between which
106 // clusters from one PHOS module are
108 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
110 TObjArray * emcRecPoints = gime->EmcRecPoints() ;
111 TObjArray * cpvRecPoints = gime->CpvRecPoints() ;
114 Int_t totalEmc = emcRecPoints->GetEntriesFast() ;
115 for(fEmcFirst = fEmcLast; (fEmcLast < totalEmc) &&
116 ((dynamic_cast<AliPHOSRecPoint *>(emcRecPoints->At(fEmcLast)))->GetPHOSMod() == fModule );
120 Int_t totalCpv = cpvRecPoints->GetEntriesFast() ;
122 for(fCpvFirst = fCpvLast; (fCpvLast < totalCpv) &&
123 ((dynamic_cast<AliPHOSRecPoint *>(cpvRecPoints->At(fCpvLast)))->GetPHOSMod() == fModule );
128 //____________________________________________________________________________
129 Float_t AliPHOSTrackSegmentMakerv1::GetDistanceInPHOSPlane(AliPHOSEmcRecPoint * emcClu,AliPHOSRecPoint * cpvClu, Bool_t &toofar) const
131 // Calculates the distance between the EMC RecPoint and the PPSD RecPoint
132 // Clusters are sorted in "rows" and "columns" of width 1 cm
134 Float_t delta = 1 ; // Width of the rows in sorting of RecPoints (in cm)
135 // if you change this value, change it as well in xxxRecPoint::Compare()
136 Float_t distance = fRcpv ;
138 TVector3 vecEmc ; // Local position of EMC recpoint
139 TVector3 vecCpv ; // Local position of CPV recpoint propagated to EMC
140 TVector3 vecDist ; // Distance between local positions of two points
142 emcClu->GetLocalPosition(vecEmc) ;
143 cpvClu->GetLocalPosition(vecCpv) ;
146 if(emcClu->GetPHOSMod() == cpvClu->GetPHOSMod()){
148 Info("GetDistanceInPHOSPlane","%z",fESD);
150 // Extrapolate the global track direction if any to CPV and find the closest track
151 Int_t nTracks = fESD->GetNumberOfTracks();
152 Int_t iClosestTrack = -1;
154 Double_t minDistance = 1e6;
155 Double_t pxyz[3], xyz[3];
157 for (Int_t iTrack=0; iTrack<nTracks; iTrack++) {
158 track = fESD->GetTrack(iTrack);
159 track->GetOuterXYZ(xyz); // track coord on the cylinder of PHOS radius
160 track->GetOuterPxPyPz(pxyz); // track momentum ibid.
161 vecDist = PropagateToCPV(xyz,pxyz,cpvClu->GetPHOSMod());
163 distance = TMath::Sqrt(vecDist.X()*vecDist.X() + vecDist.Z()*vecDist.Z());
164 // Find the closest track to the EMC recpoint
165 if (distance < minDistance) {
166 minDistance = distance;
167 iClosestTrack = iTrack;
171 if (iClosestTrack != -1) {
172 track = fESD->GetTrack(iClosestTrack);
173 track->GetOuterPxPyPz(pxyz); // track momentum ibid.
174 TVector3 vecCpvGlobal; // Global position of the CPV recpoint
175 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
176 const AliPHOSGeometry * geom = gime->PHOSGeometry() ;
177 geom->GetGlobal((AliRecPoint*)cpvClu,vecCpvGlobal);
178 for (Int_t ixyz=0; ixyz<3; ixyz++)
179 xyz[ixyz] = vecCpvGlobal[ixyz];
180 vecDist = PropagateToCPV(xyz,pxyz,cpvClu->GetPHOSMod());
182 distance = TMath::Sqrt(vecDist.X()*vecDist.X() + vecDist.Z()*vecDist.Z());
185 // If no ESD, than simply find EMC-CPV distance
186 distance = (vecCpv - vecEmc).Mag() ;
188 if(distance < fRcpv + 2*delta )
195 //____________________________________________________________________________
196 TVector3 AliPHOSTrackSegmentMakerv1::PropagateToCPV(Double_t *x, Double_t *p,
197 Int_t moduleNumber) const
199 // Propagate a straight-line track from the origin point x
200 // along the direction p to the CPV module moduleNumber
201 // Returns a local position of such a propagation
203 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
204 const AliPHOSGeometry * geom = gime->PHOSGeometry() ;
205 TVector3 moduleCenter = geom->GetCpvModuleCenter(moduleNumber);
207 TVector3 direction(p);
209 Double_t time = (moduleCenter.Mag2() - vertex.Dot(moduleCenter)) /
210 (direction.Dot(moduleCenter));
211 TVector3 globalIntersection = vertex + direction*time;
212 return geom->Global2LocalCpv(globalIntersection,moduleNumber);
215 //____________________________________________________________________________
216 void AliPHOSTrackSegmentMakerv1::Init()
218 // Make all memory allocations that are not possible in default constructor
220 AliPHOSGetter* gime = AliPHOSGetter::Instance(GetTitle(), fEventFolderName.Data());
222 fLinkUpArray = new TClonesArray("AliPHOSLink", 1000);
223 if ( !gime->TrackSegmentMaker() ) {
224 gime->PostTrackSegmentMaker(this);
228 //____________________________________________________________________________
229 void AliPHOSTrackSegmentMakerv1::InitParameters()
231 //Initializes parameters
238 fTrackSegmentsInRun = 0 ;
239 SetEventRange(0,-1) ;
243 //____________________________________________________________________________
244 void AliPHOSTrackSegmentMakerv1::MakeLinks()const
246 // Finds distances (links) between all EMC and PPSD clusters,
247 // which are not further apart from each other than fRcpv
248 // and sort them in accordance with this distance
250 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
251 TObjArray * emcRecPoints = gime->EmcRecPoints() ;
252 TObjArray * cpvRecPoints = gime->CpvRecPoints() ;
254 fLinkUpArray->Clear() ;
256 AliPHOSRecPoint * cpv ;
257 AliPHOSEmcRecPoint * emcclu ;
262 for(iEmcRP = fEmcFirst; iEmcRP < fEmcLast; iEmcRP++ ) {
263 emcclu = dynamic_cast<AliPHOSEmcRecPoint *>(emcRecPoints->At(iEmcRP)) ;
267 for(iCpv = fCpvFirst; iCpv < fCpvLast;iCpv++ ) {
269 cpv = dynamic_cast<AliPHOSRecPoint *>(cpvRecPoints->At(iCpv)) ;
270 Float_t r = GetDistanceInPHOSPlane(emcclu, cpv, toofar) ;
275 new ((*fLinkUpArray)[iLinkUp++]) AliPHOSLink(r, iEmcRP, iCpv) ;
280 fLinkUpArray->Sort() ; //first links with smallest distances
283 //____________________________________________________________________________
284 void AliPHOSTrackSegmentMakerv1::MakePairs()
286 // Using the previously made list of "links", we found the smallest link - i.e.
287 // link with the least distance between EMC and CPV and pointing to still
288 // unassigned RecParticles. We assign these RecPoints to TrackSegment and
289 // remove them from the list of "unassigned".
291 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
293 TObjArray * emcRecPoints = gime->EmcRecPoints() ;
294 TObjArray * cpvRecPoints = gime->CpvRecPoints() ;
295 TClonesArray * trackSegments = gime->TrackSegments();
297 //Make arrays to mark clusters already chosen
298 Int_t * emcExist = 0;
299 if(fEmcLast > fEmcFirst)
300 emcExist = new Int_t[fEmcLast-fEmcFirst] ;
303 for(index = 0; index <fEmcLast-fEmcFirst; index ++)
304 emcExist[index] = 1 ;
306 Bool_t * cpvExist = 0;
307 if(fCpvLast > fCpvFirst)
308 cpvExist = new Bool_t[fCpvLast-fCpvFirst] ;
309 for(index = 0; index <fCpvLast-fCpvFirst; index ++)
310 cpvExist[index] = kTRUE ;
313 // Finds the smallest links and makes pairs of CPV and EMC clusters with smallest distance
314 TIter nextUp(fLinkUpArray) ;
316 AliPHOSLink * linkUp ;
318 AliPHOSRecPoint * nullpointer = 0 ;
320 while ( (linkUp = static_cast<AliPHOSLink *>(nextUp()) ) ){
322 if(emcExist[linkUp->GetEmc()-fEmcFirst] != -1){ //without ppsd Up yet
324 if(cpvExist[linkUp->GetPpsd()-fCpvFirst]){ //CPV still exist
326 new ((* trackSegments)[fNTrackSegments])
327 AliPHOSTrackSegment(dynamic_cast<AliPHOSEmcRecPoint *>(emcRecPoints->At(linkUp->GetEmc())) ,
328 dynamic_cast<AliPHOSRecPoint *>(cpvRecPoints->At(linkUp->GetPpsd()))) ;
329 (dynamic_cast<AliPHOSTrackSegment *>(trackSegments->At(fNTrackSegments)))->SetIndexInList(fNTrackSegments);
332 emcExist[linkUp->GetEmc()-fEmcFirst] = -1 ; //Mark emc that Cpv was found
333 //mark CPV recpoint as already used
334 cpvExist[linkUp->GetPpsd()-fCpvFirst] = kFALSE ;
335 } //if ppsdUp still exist
339 //look through emc recPoints left without CPV/PPSD
340 if(emcExist){ //if there is emc rec point
342 for(iEmcRP = 0; iEmcRP < fEmcLast-fEmcFirst ; iEmcRP++ ){
343 if(emcExist[iEmcRP] > 0 ){
344 new ((*trackSegments)[fNTrackSegments])
345 AliPHOSTrackSegment(dynamic_cast<AliPHOSEmcRecPoint *>(emcRecPoints->At(iEmcRP+fEmcFirst)),
347 (dynamic_cast<AliPHOSTrackSegment *>(trackSegments->At(fNTrackSegments)))->SetIndexInList(fNTrackSegments);
356 //____________________________________________________________________________
357 void AliPHOSTrackSegmentMakerv1::Exec(Option_t *option)
359 // Steering method to perform track segment construction for events
360 // in the range from fFirstEvent to fLastEvent.
361 // This range is optionally set by SetEventRange().
362 // if fLastEvent=-1 (by default), then process events until the end.
364 if(strstr(option,"tim"))
365 gBenchmark->Start("PHOSTSMaker");
367 if(strstr(option,"print")) {
372 AliPHOSGetter * gime = AliPHOSGetter::Instance(GetTitle()) ;
374 const AliPHOSGeometry * geom = gime->PHOSGeometry() ;
376 if (fLastEvent == -1) fLastEvent = gime->MaxEvent() - 1 ;
377 else fLastEvent = TMath::Min(fFirstEvent,gime->MaxEvent());
378 Int_t nEvents = fLastEvent - fFirstEvent + 1;
381 for (ievent = fFirstEvent; ievent <= fLastEvent; ievent++) {
382 gime->Event(ievent,"R") ;
383 //Make some initializations
384 fNTrackSegments = 0 ;
390 gime->TrackSegments()->Clear();
392 // if(!ReadRecPoints(ievent)) continue; //reads RecPoints for event ievent
394 for(fModule = 1; fModule <= geom->GetNModules() ; fModule++ ) {
400 WriteTrackSegments() ;
402 if(strstr(option,"deb"))
403 PrintTrackSegments(option);
405 //increment the total number of track segments per run
406 fTrackSegmentsInRun += gime->TrackSegments()->GetEntriesFast() ;
410 if(strstr(option,"tim")){
411 gBenchmark->Stop("PHOSTSMaker");
412 Info("Exec", "took %f seconds for making TS %f seconds per event",
413 gBenchmark->GetCpuTime("PHOSTSMaker"),
414 gBenchmark->GetCpuTime("PHOSTSMaker")/nEvents) ;
419 //____________________________________________________________________________
420 void AliPHOSTrackSegmentMakerv1::Unload()
422 // Unloads the task from the folder
423 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
424 gime->PhosLoader()->UnloadRecPoints() ;
425 gime->PhosLoader()->UnloadTracks() ;
428 //____________________________________________________________________________
429 void AliPHOSTrackSegmentMakerv1::Print()const
431 // Print TrackSegmentMaker parameters
433 TString message("") ;
434 if( strcmp(GetName(), "") != 0 ) {
435 message = "\n======== AliPHOSTrackSegmentMakerv1 ========\n" ;
436 message += "Making Track segments\n" ;
437 message += "with parameters:\n" ;
438 message += " Maximal EMC - CPV (PPSD) distance (cm) %f\n" ;
439 message += "============================================\n" ;
440 Info("Print", message.Data(),fRcpv) ;
443 Info("Print", "AliPHOSTrackSegmentMakerv1 not initialized ") ;
446 //____________________________________________________________________________
447 void AliPHOSTrackSegmentMakerv1::WriteTrackSegments()
449 // Writes found TrackSegments to TreeR. Creates branches
450 // "PHOSTS" and "AliPHOSTrackSegmentMaker" with the same title.
451 // In the former branch found TrackSegments are stored, while
452 // in the latter all parameters, with which TS were made.
453 // ROOT does not allow overwriting existing branches, therefore
454 // first we check, if branches with the same title already exist.
455 // If yes - exits without writing.
457 AliPHOSGetter *gime = AliPHOSGetter::Instance() ;
459 TClonesArray * trackSegments = gime->TrackSegments() ;
460 trackSegments->Expand(trackSegments->GetEntriesFast()) ;
462 TTree * treeT = gime->TreeT();
465 Int_t bufferSize = 32000 ;
466 TBranch * tsBranch = treeT->Branch("PHOSTS",&trackSegments,bufferSize);
469 gime->WriteTracks("OVERWRITE");
470 gime->WriteTrackSegmentMaker("OVERWRITE");
474 //____________________________________________________________________________
475 void AliPHOSTrackSegmentMakerv1::PrintTrackSegments(Option_t * option)
477 // option deb - prints # of found TrackSegments
478 // option deb all - prints as well indexed of found RecParticles assigned to the TS
480 TClonesArray * trackSegments = AliPHOSGetter::Instance()->TrackSegments() ;
482 Info("PrintTrackSegments", "Results from TrackSegmentMaker:") ;
483 printf("nevent: %d\n", gAlice->GetEvNumber()) ;
484 printf(" Found %d TrackSegments\n", trackSegments->GetEntriesFast() );
486 if(strstr(option,"all")) { // printing found TS
487 printf("TrackSegment # EMC RP# CPV RP#\n") ;
489 for (index = 0 ; index <trackSegments->GetEntriesFast() ; index++) {
490 AliPHOSTrackSegment * ts = (AliPHOSTrackSegment * )trackSegments->At(index) ;
491 printf(" %d %d %d \n", ts->GetIndexInList(), ts->GetEmcIndex(), ts->GetCpvIndex() ) ;