1 //-------------------------------------------------------------------------
2 // Implementation of the ITS tracker class
3 // The pattern recongintion based on the "cooked covariance" approach
4 //-------------------------------------------------------------------------
7 #include <TClonesArray.h>
10 #include "AliESDEvent.h"
11 #include "AliITSUClusterPix.h"
12 #include "AliITSUGeomTGeo.h"
13 #include "AliITSUTrackerCooked.h"
14 #include "AliITSUTrackCooked.h"
16 ClassImp(AliITSUTrackerCooked)
18 //************************************************
19 // Constants hardcoded for the moment:
20 //************************************************
21 // seed "windows" in z and phi: MakeSeeds
22 const Double_t kzWin=0.33;
23 const Double_t kminPt=0.05;
24 // Maximal accepted impact parameters for the seeds
25 const Double_t kmaxDCAxy=3.;
26 const Double_t kmaxDCAz= 3.;
27 // Layers for the seeding
28 const Int_t kSeedingLayer1=6, kSeedingLayer2=4, kSeedingLayer3=5;
29 // Space point resolution
30 const Double_t kSigma2=0.0005*0.0005;
32 const Double_t kmaxChi2PerCluster=20.;
33 const Double_t kmaxChi2PerTrack=30.;
34 // Tracking "road" from layer to layer
35 const Double_t kRoadY=0.7;
36 const Double_t kRoadZ=0.7;
37 // Minimal number of attached clusters
38 const Int_t kminNumberOfClusters=3;
40 //************************************************
42 //************************************************
44 // Precalculate cylidnrical (r,phi) for the clusters;
45 // use exact r's for the clusters
48 AliITSUTrackerCooked::AliITSUlayer
49 AliITSUTrackerCooked::fgLayers[AliITSUTrackerCooked::kNLayers];
51 AliITSUTrackerCooked::AliITSUTrackerCooked():
58 //--------------------------------------------------------------------
59 // This default constructor needs to be provided
60 //--------------------------------------------------------------------
62 klRadius[7]={2.34, 3.15, 3.93, 19.61, 24.55, 34.39, 39.34}; //tdr6
64 AliITSUGeomTGeo *gm = new AliITSUGeomTGeo(kTRUE,kTRUE);
65 AliITSUClusterPix::SetGeom(gm);
67 for (Int_t i=0; i<kNLayers; i++) fgLayers[i].SetR(klRadius[i]);
69 // Some default primary vertex
70 Double_t xyz[]={0.,0.,0.};
71 Double_t ers[]={2.,2.,2.};
77 void AliITSUTrackerCooked::ResetTrackToFollow(const AliITSUTrackCooked &t) {
78 //--------------------------------------------------------------------
79 // Prepare to follow a new track seed
80 //--------------------------------------------------------------------
81 delete fTrackToFollow;
82 fTrackToFollow = new AliITSUTrackCooked(t);
85 void AliITSUTrackerCooked::ResetBestTrack() {
86 //--------------------------------------------------------------------
87 // Replace the best track branch
88 //--------------------------------------------------------------------
90 fBestTrack = new AliITSUTrackCooked(*fTrackToFollow);
93 AliITSUTrackerCooked::~AliITSUTrackerCooked()
95 //--------------------------------------------------------------------
97 //--------------------------------------------------------------------
99 if (fSeeds) fSeeds->Delete(); delete fSeeds;
101 delete fTrackToFollow;
106 f1(Double_t x1, Double_t y1, Double_t x2, Double_t y2, Double_t x3, Double_t y3)
108 //-----------------------------------------------------------------
109 // Initial approximation of the track curvature
110 //-----------------------------------------------------------------
111 Double_t d=(x2-x1)*(y3-y2)-(x3-x2)*(y2-y1);
112 Double_t a=0.5*((y3-y2)*(y2*y2-y1*y1+x2*x2-x1*x1)-
113 (y2-y1)*(y3*y3-y2*y2+x3*x3-x2*x2));
114 Double_t b=0.5*((x2-x1)*(y3*y3-y2*y2+x3*x3-x2*x2)-
115 (x3-x2)*(y2*y2-y1*y1+x2*x2-x1*x1));
117 Double_t xr=TMath::Abs(d/(d*x1-a)), yr=TMath::Abs(d/(d*y1-b));
119 Double_t crv=xr*yr/sqrt(xr*xr+yr*yr);
126 f2(Double_t x1, Double_t y1, Double_t x2, Double_t y2, Double_t x3, Double_t y3)
128 //-----------------------------------------------------------------
129 // Initial approximation of the x-coordinate of the center of curvature
130 //-----------------------------------------------------------------
132 Double_t k1=(y2-y1)/(x2-x1), k2=(y3-y2)/(x3-x2);
133 Double_t x0=0.5*(k1*k2*(y1-y3) + k2*(x1+x2) - k1*(x2+x3))/(k2-k1);
139 f3(Double_t x1, Double_t y1, Double_t x2, Double_t y2, Double_t z1, Double_t z2)
141 //-----------------------------------------------------------------
142 // Initial approximation of the tangent of the track dip angle
143 //-----------------------------------------------------------------
144 return (z1 - z2)/sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
147 Bool_t AliITSUTrackerCooked::
148 AddCookedSeed(const Float_t r1[3], Int_t l1, Int_t i1,
149 const Float_t r2[3], Int_t l2, Int_t i2,
150 const AliCluster *c3,Int_t l3, Int_t i3)
152 //--------------------------------------------------------------------
153 // This is the main cooking function.
154 // Creates seed parameters out of provided clusters.
155 //--------------------------------------------------------------------
157 if (!c3->GetXAlphaRefPlane(x,a)) return kFALSE;
159 Double_t ca=TMath::Cos(a), sa=TMath::Sin(a);
160 Double_t x1 = r1[0]*ca + r1[1]*sa,
161 y1 =-r1[0]*sa + r1[1]*ca, z1 = r1[2];
162 Double_t x2 = r2[0]*ca + r2[1]*sa,
163 y2 =-r2[0]*sa + r2[1]*ca, z2 = r2[2];
164 Double_t x3 = x, y3 = c3->GetY(), z3 = c3->GetZ();
169 Double_t crv=f1(x1, y1, x2, y2, x3, y3); //curvature
170 Double_t x0 =f2(x1, y1, x2, y2, x3, y3); //x-coordinate of the center
171 Double_t tgl12=f3(x1, y1, x2, y2, z1, z2);
172 Double_t tgl23=f3(x2, y2, x3, y3, z2, z3);
174 Double_t sf=crv*(x-x0);
175 if (TMath::Abs(sf) >= kAlmost1) return kFALSE;
178 par[3]=0.5*(tgl12 + tgl23);
180 par[4]=(TMath::Abs(bz) < kAlmost0Field) ? kAlmost0 : crv/(bz*kB2C);
184 for (Int_t i=0; i<15; i++) cov[i]=0.;
187 cov[5] =0.007*0.007*10; //FIXME all these lines
188 cov[9] =0.007*0.007*10;
191 const Double_t dlt=0.0005;
193 fy=1./(fgLayers[kSeedingLayer3].GetR() - fgLayers[kSeedingLayer2].GetR());
195 Double_t cy=(f1(x1, y1, x2, y2+dlt, x3, y3) - crv)/dlt/bz/kB2C;
196 cy*=20; //FIXME: MS contribution to the cov[14]
200 cov[1]=0.; cov[2]=s2;
201 cov[3]=s2*fy; cov[4]=0.; cov[5]=s2*fy*fy;
202 cov[6]=0.; cov[7]=s2*tz; cov[8]=0.; cov[9]=s2*tz*tz;
203 cov[10]=s2*cy; cov[11]=0.; cov[12]=s2*fy*cy; cov[13]=0.; cov[14]=s2*cy*cy;
205 AliITSUTrackCooked *seed=new AliITSUTrackCooked();
206 seed->Set(Double_t(x), Double_t(a), par, cov);
209 seed->GetDZ(GetX(),GetY(),GetZ(),GetBz(),dz);
210 if (TMath::Abs(dz[0]) > kmaxDCAxy) {delete seed; return kFALSE;}
211 if (TMath::Abs(dz[1]) > kmaxDCAz ) {delete seed; return kFALSE;}
213 Double_t xx0 = 0.008; // Rough layer thickness
214 Double_t radl= 9.36; // Radiation length of Si [cm]
215 Double_t rho = 2.33; // Density of Si [g/cm^3]
216 Double_t mass= 0.139;// Pion
217 if (!seed->CorrectForMeanMaterial(xx0, xx0*radl*rho, mass, kTRUE)) {
218 delete seed; return kFALSE;
221 seed->SetClusterIndex(l1,i1);
222 seed->SetClusterIndex(l2,i2);
223 seed->SetClusterIndex(l3,i3);
225 fSeeds->AddLast(seed);
230 Int_t AliITSUTrackerCooked::MakeSeeds() {
231 //--------------------------------------------------------------------
232 // This is the main pattern recongition function.
233 // Creates seeds out of two clusters and another point.
234 //--------------------------------------------------------------------
235 if (fSeeds) {fSeeds->Delete(); delete fSeeds;}
236 fSeeds=new TObjArray(77777);
238 const Double_t zv=GetZ();
240 AliITSUlayer &layer1=fgLayers[kSeedingLayer1];
241 AliITSUlayer &layer2=fgLayers[kSeedingLayer2];
242 AliITSUlayer &layer3=fgLayers[kSeedingLayer3];
243 Double_t r1=layer1.GetR();
244 Double_t r2=layer2.GetR();
245 Double_t r3=layer3.GetR();
247 const Double_t maxC = TMath::Abs(GetBz()*kB2C/kminPt);
248 const Double_t kpWin = TMath::ASin(0.5*maxC*r1) - TMath::ASin(0.5*maxC*r2);
250 Int_t nClusters1=layer1.GetNumberOfClusters();
251 Int_t nClusters2=layer2.GetNumberOfClusters();
252 Int_t nClusters3=layer3.GetNumberOfClusters();
253 for (Int_t n1=0; n1<nClusters1; n1++) {
254 AliCluster *c1=layer1.GetCluster(n1);
256 //Int_t lab=c1->GetLabel(0);
258 Double_t z1=c1->GetZ();
259 Float_t xyz1[3]; c1->GetGlobalXYZ(xyz1);
260 Double_t phi1=TMath::ATan2(xyz1[1],xyz1[0]);
261 Double_t zr2=zv + r2/r1*(z1-zv);
262 Int_t start2=layer2.FindClusterIndex(zr2-kzWin);
263 for (Int_t n2=start2; n2<nClusters2; n2++) {
264 AliCluster *c2=layer2.GetCluster(n2);
266 //if (c2->GetLabel(0)!=lab) continue;
268 Double_t z2=c2->GetZ();
269 if (z2 > (zr2+kzWin)) break; //check in Z
271 Float_t xyz2[3]; c2->GetGlobalXYZ(xyz2);
272 Double_t phi2=TMath::ATan2(xyz2[1],xyz2[0]);
273 if (TMath::Abs(phi2-phi1) > kpWin) continue; //check in Phi
275 Double_t zr3=z1 + (r3-r1)/(r2-r1)*(z2-z1);
276 Double_t crv=f1(xyz1[0], xyz1[1], xyz2[0], xyz2[1], GetX(), GetY());
277 Double_t phir3 = phi1 + 0.5*crv*(r3 - r1);
279 Int_t start3=layer3.FindClusterIndex(zr3-kzWin/2);
280 for (Int_t n3=start3; n3<nClusters3; n3++) {
281 AliCluster *c3=layer3.GetCluster(n3);
283 //if (c3->GetLabel(0)!=lab) continue;
285 Double_t z3=c3->GetZ();
286 if (z3 > (zr3+kzWin/2)) break; //check in Z
288 Float_t xyz3[3]; c3->GetGlobalXYZ(xyz3);
289 Double_t phi3=TMath::ATan2(xyz3[1],xyz3[0]);
290 if (TMath::Abs(phir3-phi3) > kpWin/100) continue; //check in Phi
292 AliITSUClusterPix cc(*((AliITSUClusterPix*)c2));
294 AddCookedSeed(xyz1, kSeedingLayer1, n1,
295 xyz3, kSeedingLayer3, n3,
296 &cc, kSeedingLayer2, n2);
302 for (Int_t n1=0; n1<nClusters1; n1++) {
303 AliCluster *c1=layer1.GetCluster(n1);
304 ((AliITSUClusterPix*)c1)->GoToFrameTrk();
306 for (Int_t n2=0; n2<nClusters2; n2++) {
307 AliCluster *c2=layer2.GetCluster(n2);
308 ((AliITSUClusterPix*)c2)->GoToFrameTrk();
310 for (Int_t n3=0; n3<nClusters3; n3++) {
311 AliCluster *c3=layer3.GetCluster(n3);
312 ((AliITSUClusterPix*)c3)->GoToFrameTrk();
316 return fSeeds->GetEntriesFast();
319 Int_t AliITSUTrackerCooked::Clusters2Tracks(AliESDEvent *event) {
320 //--------------------------------------------------------------------
321 // This is the main tracking function
322 // The clusters must already be loaded
323 //--------------------------------------------------------------------
325 Int_t nSeeds=MakeSeeds();
327 // Possibly, icrement the seeds with additional clusters (Kalman)
329 // Possibly, (re)fit the found tracks
332 for (Int_t s=0; s<nSeeds; s++) {
333 const AliITSUTrackCooked *track=(AliITSUTrackCooked*)fSeeds->At(s);
334 ResetTrackToFollow(*track);
337 fgLayers[fI].ResetTrack(*track);
339 for (FollowProlongation(); fI<kSeedingLayer2; fI++) {
340 while (TakeNextProlongation()) FollowProlongation();
343 if (fBestTrack->GetNumberOfClusters() < kminNumberOfClusters) continue;
345 CookLabel(fBestTrack,0.); //For comparison only
346 Int_t label=fBestTrack->GetLabel();
347 if (label>0) ngood++;
350 iotrack.UpdateTrackParams(fBestTrack,AliESDtrack::kITSin);
351 iotrack.SetLabel(label);
352 event->AddTrack(&iotrack);
353 UseClusters(fBestTrack);
356 Info("Clusters2Tracks","Seeds: %d",nSeeds);
358 Info("Clusters2Tracks","Good tracks/seeds: %f",Float_t(ngood)/nSeeds);
360 if (fSeeds) {fSeeds->Delete(); delete fSeeds;}
366 void AliITSUTrackerCooked::FollowProlongation() {
367 //--------------------------------------------------------------------
368 // Push this track tree branch towards the primary vertex
369 //--------------------------------------------------------------------
372 AliITSUlayer &layer = fgLayers[fI]; //fI is the number of the next layer
373 Double_t r=layer.GetR();
375 //Find intersection (fTrackToFollow is still at the previous layer)
377 if (!fTrackToFollow->GetPhiZat(r,phi,z)) {
378 //Warning("FollowProlongation","failed to estimate track !\n");
382 //if (TMath::Abs(fTrackToFollow.GetZ()-GetZ()) > r+dz) return;
383 Double_t zMin = z - kRoadZ;
384 Double_t zMax = z + kRoadZ;
385 Double_t phiMin = phi - kRoadY/r;
386 Double_t phiMax = phi + kRoadY/r;
387 if (layer.SelectClusters(zMin, zMax, phiMin, phiMax)==0) return;
389 if (!TakeNextProlongation()) return;
393 //deal with the best track
394 Int_t ncl=fTrackToFollow->GetNumberOfClusters();
395 Int_t nclb=fBestTrack->GetNumberOfClusters();
397 Double_t chi2=fTrackToFollow->GetChi2();
398 if (chi2 < kmaxChi2PerTrack) {
399 if (ncl > nclb || chi2 < fBestTrack->GetChi2()) {
407 Int_t AliITSUTrackerCooked::TakeNextProlongation() {
408 //--------------------------------------------------------------------
409 // Switch to the next track tree branch
410 //--------------------------------------------------------------------
411 AliITSUlayer &layer=fgLayers[fI];
413 const AliCluster *c=0; Int_t ci=-1;
414 const AliCluster *cc=0; Int_t cci=-1;
416 Double_t x=0., alpha=0.;
417 Double_t z=0., dz=0., y=0., dy=0., chi2=0.;
418 while ((c=layer.GetNextCluster(ci))!=0) {
419 if (c->IsClusterUsed()) continue;
420 Int_t id=c->GetVolumeId();
423 Float_t xr,ar; c->GetXAlphaRefPlane(xr, ar);
425 const AliITSUTrackCooked *t = fgLayers[fI+1].GetTrack();
426 ResetTrackToFollow(*t);
427 if (!fTrackToFollow->Propagate(alpha, x, GetBz())) {
428 //Warning("TakeNextProlongation","propagation failed !\n");
431 dz=7*TMath::Sqrt(fTrackToFollow->GetSigmaZ2() + kSigma2);
432 dy=7*TMath::Sqrt(fTrackToFollow->GetSigmaY2() + kSigma2);
433 z=fTrackToFollow->GetZ();
434 y=fTrackToFollow->GetY();
437 //if (TMath::Abs(fTrackToFollow.GetZ()-GetZ())>layer.GetR()+dz) continue;
439 if (TMath::Abs(z - c->GetZ()) > dz) continue;
440 if (TMath::Abs(y - c->GetY()) > dy) continue;
442 Double_t ch2=fTrackToFollow->GetPredictedChi2(c);
443 if (ch2 > kmaxChi2PerCluster) continue;
451 if (!fTrackToFollow->Update(cc,chi2,(fI<<28)+cci)) {
452 //Warning("TakeNextProlongation","filtering failed !\n");
455 Double_t xx0 = (fI > 2) ? 0.008 : 0.003; // Rough layer thickness
456 Double_t x0 = 9.36; // Radiation length of Si [cm]
457 Double_t rho = 2.33; // Density of Si [g/cm^3]
458 Double_t mass = fTrackToFollow->GetMass();
459 fTrackToFollow->CorrectForMeanMaterial(xx0, xx0*x0*rho, mass, kTRUE);
460 layer.ResetTrack(*fTrackToFollow);
465 Int_t AliITSUTrackerCooked::PropagateBack(AliESDEvent *event) {
466 //--------------------------------------------------------------------
467 // Here, we implement the Kalman smoother ?
468 // The clusters must already be loaded
469 //--------------------------------------------------------------------
470 Int_t n=event->GetNumberOfTracks();
473 for (Int_t i=0; i<n; i++) {
474 AliESDtrack *esdTrack=event->GetTrack(i);
476 if ((esdTrack->GetStatus()&AliESDtrack::kITSin)==0) continue;
478 AliITSUTrackCooked track(*esdTrack);
480 ResetTrackToFollow(track);
482 fTrackToFollow->ResetCovariance(10.); fTrackToFollow->ResetClusters();
483 if (RefitAt(40., fTrackToFollow, &track)) {
485 CookLabel(fTrackToFollow, 0.); //For comparison only
486 Int_t label=fTrackToFollow->GetLabel();
487 if (label>0) ngood++;
489 esdTrack->UpdateTrackParams(fTrackToFollow,AliESDtrack::kITSout);
490 //UseClusters(fTrackToFollow);
495 Info("PropagateBack","Back propagated tracks: %d",ntrk);
497 Info("PropagateBack","Good tracks/back propagated: %f",Float_t(ngood)/ntrk);
502 Bool_t AliITSUTrackerCooked::
503 RefitAt(Double_t xx, AliITSUTrackCooked *t, const AliITSUTrackCooked *c) {
504 //--------------------------------------------------------------------
505 // This function refits the track "t" at the position "x" using
506 // the clusters from "c"
507 //--------------------------------------------------------------------
508 Int_t index[kNLayers];
510 for (k=0; k<kNLayers; k++) index[k]=-1;
511 Int_t nc=c->GetNumberOfClusters();
512 for (k=0; k<nc; k++) {
513 Int_t idx=c->GetClusterIndex(k), nl=(idx&0xf0000000)>>28;
517 Int_t from, to, step;
518 if (xx > t->GetX()) {
522 from=kNLayers-1; to=-1;
526 for (Int_t i=from; i != to; i += step) {
529 const AliCluster *cl=GetCluster(idx);
530 Float_t xr,ar; cl->GetXAlphaRefPlane(xr, ar);
531 if (!t->Propagate(Double_t(ar), Double_t(xr), GetBz())) {
532 //Warning("RefitAt","propagation failed !\n");
535 Double_t chi2=t->GetPredictedChi2(cl);
536 if (chi2 < kmaxChi2PerCluster) t->Update(cl, chi2, idx);
538 Double_t r=fgLayers[i].GetR();
540 if (!t->GetPhiZat(r,phi,z)) {
541 //Warning("RefitAt","failed to estimate track !\n");
544 if (!t->Propagate(phi, r, GetBz())) {
545 //Warning("RefitAt","propagation failed !\n");
549 Double_t xx0 = (i > 2) ? 0.008 : 0.003; // Rough layer thickness
550 Double_t x0 = 9.36; // Radiation length of Si [cm]
551 Double_t rho = 2.33; // Density of Si [g/cm^3]
552 Double_t mass = t->GetMass();
553 t->CorrectForMeanMaterial(xx0, -step*xx0*x0*rho, mass, kTRUE);
556 if (!t->PropagateTo(xx,0.,0.)) return kFALSE;
560 Int_t AliITSUTrackerCooked::RefitInward(AliESDEvent *event) {
561 //--------------------------------------------------------------------
562 // Some final refit, after the outliers get removed by the smoother ?
563 // The clusters must be loaded
564 //--------------------------------------------------------------------
565 Int_t n=event->GetNumberOfTracks();
568 for (Int_t i=0; i<n; i++) {
569 AliESDtrack *esdTrack=event->GetTrack(i);
571 if ((esdTrack->GetStatus()&AliESDtrack::kITSout) == 0) continue;
573 AliITSUTrackCooked track(*esdTrack);
574 ResetTrackToFollow(track);
576 fTrackToFollow->ResetCovariance(10.); fTrackToFollow->ResetClusters();
577 if (!RefitAt(2.1, fTrackToFollow, &track)) continue;
578 //Cross the beam pipe
579 if (!fTrackToFollow->PropagateTo(1.8, 2.27e-3, 35.28*1.848)) continue;
581 CookLabel(fTrackToFollow, 0.); //For comparison only
582 Int_t label=fTrackToFollow->GetLabel();
583 if (label>0) ngood++;
585 esdTrack->UpdateTrackParams(fTrackToFollow,AliESDtrack::kITSrefit);
586 //esdTrack->RelateToVertex(event->GetVertex(),GetBz(),33.);
587 //UseClusters(fTrackToFollow);
591 Info("RefitInward","Refitted tracks: %d",ntrk);
593 Info("RefitInward","Good tracks/refitted: %f",Float_t(ngood)/ntrk);
598 Int_t AliITSUTrackerCooked::LoadClusters(TTree *cTree) {
599 //--------------------------------------------------------------------
600 // This function reads the ITSU clusters from the tree,
601 // sort them, distribute over the internal tracker arrays, etc
602 //--------------------------------------------------------------------
604 AliFatal("No cluster tree !");
608 //This TClonesArray is not the owner of the clusters
609 TClonesArray dummy("AliITSUClusterPix",kMaxClusterPerLayer), *clusters=&dummy;
611 for (Int_t i=0; i<kNLayers; i++) {
612 TBranch *br = cTree->GetBranch(Form("ITSRecPoints%d",i));
613 if (!br) {AliFatal(Form("No cluster branch for layer %d",i)); return 1;}
614 br->SetAddress(&clusters);
620 fgLayers[i].InsertClusters(clusters,kTRUE);
623 fgLayers[i].InsertClusters(clusters,kFALSE);
632 void AliITSUTrackerCooked::UnloadClusters() {
633 //--------------------------------------------------------------------
634 // This function unloads ITSU clusters from the RAM
635 //--------------------------------------------------------------------
636 for (Int_t i=0; i<kNLayers; i++) fgLayers[i].DeleteClusters();
639 AliCluster *AliITSUTrackerCooked::GetCluster(Int_t index) const {
640 //--------------------------------------------------------------------
641 // Return pointer to a given cluster
642 //--------------------------------------------------------------------
643 Int_t l=(index & 0xf0000000) >> 28;
644 Int_t c=(index & 0x0fffffff) >> 00;
645 return fgLayers[l].GetCluster(c);
648 AliITSUTrackerCooked::AliITSUlayer::AliITSUlayer():
654 //--------------------------------------------------------------------
655 // This default constructor needs to be provided
656 //--------------------------------------------------------------------
657 for (Int_t i=0; i<kMaxClusterPerLayer; i++) fClusters[i]=0;
658 for (Int_t i=0; i<kMaxSelected; i++) fIndex[i]=-1;
661 AliITSUTrackerCooked::AliITSUlayer::~AliITSUlayer()
663 //--------------------------------------------------------------------
665 //--------------------------------------------------------------------
671 AliITSUTrackerCooked::AliITSUlayer::ResetTrack(const AliITSUTrackCooked &t) {
672 //--------------------------------------------------------------------
673 // Replace the track estimate at this layer
674 //--------------------------------------------------------------------
676 fTrack=new AliITSUTrackCooked(t);
679 void AliITSUTrackerCooked::
680 AliITSUlayer::InsertClusters(TClonesArray *clusters, Bool_t seedingLayer)
682 //--------------------------------------------------------------------
683 // Load clusters to this layer
684 //--------------------------------------------------------------------
685 Int_t ncl=clusters->GetEntriesFast();
687 for (Int_t i=0; i<ncl; i++) {
688 AliITSUClusterPix *c=(AliITSUClusterPix*)clusters->UncheckedAt(i);
690 Double_t x=c->GetX(), y=c->GetY();
691 r += TMath::Sqrt(x*x + y*y);
692 if (!seedingLayer) c->GoToFrameTrk();
693 //if (!c->Misalign()) AliWarning("Can't misalign this cluster !");
694 InsertCluster(new AliITSUClusterPix(*c));
699 void AliITSUTrackerCooked::AliITSUlayer::DeleteClusters()
701 //--------------------------------------------------------------------
702 // Load clusters to this layer
703 //--------------------------------------------------------------------
704 for (Int_t i=0; i<fN; i++) {delete fClusters[i]; fClusters[i]=0;}
709 AliITSUTrackerCooked::AliITSUlayer::InsertCluster(AliCluster *c) {
710 //--------------------------------------------------------------------
711 // This function inserts a cluster to this layer in increasing
712 // order of the cluster's fZ
713 //--------------------------------------------------------------------
714 if (fN>=kMaxClusterPerLayer) {
715 ::Error("InsertCluster","Too many clusters !\n");
718 if (fN==0) fClusters[0]=c;
720 Int_t i=FindClusterIndex(c->GetZ());
722 memmove(fClusters+i+1 ,fClusters+i,k*sizeof(AliCluster*));
730 AliITSUTrackerCooked::AliITSUlayer::FindClusterIndex(Double_t z) const {
731 //--------------------------------------------------------------------
732 // This function returns the index of the first
733 // with its fZ >= "z".
734 //--------------------------------------------------------------------
738 if (z <= fClusters[b]->GetZ()) return b;
741 if (z > fClusters[e]->GetZ()) return e+1;
744 for (; b<e; m=(b+e)/2) {
745 if (z > fClusters[m]->GetZ()) b=m+1;
751 Int_t AliITSUTrackerCooked::AliITSUlayer::
752 SelectClusters(Float_t zMin,Float_t zMax,Float_t phiMin, Float_t phiMax) {
753 //--------------------------------------------------------------------
754 // This function selects clusters within the "road"
755 //--------------------------------------------------------------------
757 Float_t x=0., alpha=0.;
758 for (Int_t i=FindClusterIndex(zMin); i<fN; i++) {
759 AliCluster *c=fClusters[i];
760 if (c->GetZ() > zMax) break;
761 if (c->IsClusterUsed()) continue;
762 UShort_t id=c->GetVolumeId();
765 c->GetXAlphaRefPlane(x,alpha); //FIXME
767 Double_t cPhi=alpha + c->GetY()/fR;
768 if (cPhi<0.) cPhi+=2.*TMath::Pi();
769 else if (cPhi >= 2.*TMath::Pi()) cPhi-=2.*TMath::Pi();
770 if (cPhi <= phiMin) continue;
771 if (cPhi > phiMax) continue;
773 if (fNsel==kMaxSelected) break;
778 const AliCluster *AliITSUTrackerCooked::AliITSUlayer::GetNextCluster(Int_t &ci){
779 //--------------------------------------------------------------------
780 // This function returns clusters within the "road"
781 //--------------------------------------------------------------------