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. *
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 **************************************************************************/
18 ///////////////////////////////////////////////////////////////////////////////
20 // Time Projection Chamber track hits object //
22 // Origin: Marian Ivanov , GSI Darmstadt
25 // Container for Track Hits - based on standard TClonesArray -
26 // fArray of AliTPCTrackHitsParamV2
27 // In AliTPCTrackHitsParamV2 - parameterization of the track segment is stored
28 // for each of the track segment - relative position ( distance between hits) and
29 // charge of the hits is stored - comparing to classical TClonesArray of AliTPChit -
30 // comperssion factor of 5-7 (depending on the required precision) -
31 // In future release AliTPCTrackHitsV2 - will replace old AliTPCTrackHits - which were not
32 // based on standard ROOT containers
34 // // during building Container
35 // AddHitKartez(Int_t volumeID, Int_t trackID, Double_t x, Double_t y, Double_t z,Int_t q)
36 // void SetHitPrecision(Double_t prec) {fPrecision=prec;}
37 // void SetStepPrecision(Double_t prec) {fStep=prec;}
38 // Bool_t FlushHitStack(Bool_t force=kTRUE);
39 // //at the end necessary to have Container in consistent state
41 // // looping over Container
42 // Bool_t First(), Bool_t Next() - iterators - return status of the operation
43 // AliTPChit * GetHit(); - return current hit
48 <img src="gif/AliTPCTrackHitsV2.gif">
53 ///////////////////////////////////////////////////////////////////////////////
56 #include "AliTPCTrackHitsV2.h"
57 #include "TClonesArray.h"
62 ClassImp(AliTPCTrackHitsV2)
63 ClassImp(AliTrackHitsParamV2)
66 Int_t AliTrackHitsParamV2::fgCounter1 =0;
67 Int_t AliTrackHitsParamV2::fgCounter2 =0;
69 Int_t AliTPCTrackHitsV2::fgCounter1 =0;
70 Int_t AliTPCTrackHitsV2::fgCounter2 =0;
72 const Double_t AliTPCTrackHitsV2::fgkPrecision=1e-6; //precision
73 const Double_t AliTPCTrackHitsV2::fgkPrecision2=1e-20; //precision
74 const Double_t AliTPCTrackHitsV2::fgkTimePrecision=20.e-9; //hit time precision
79 class AliTPCTempHitInfoV2 {
81 AliTPCTempHitInfoV2();
82 void SetHit(Double_t r, Double_t z, Double_t fi, Int_t q, Float_t time);
83 UInt_t GetStackIndex() const {return fStackIndex;}
84 void SetStackIndex(UInt_t i) {fStackIndex=i;}
85 UInt_t GetParamIndex() const {return fParamIndex;}
86 void SetParamIndex(UInt_t i) {fParamIndex=i;}
87 Float_t GetTimeStack(Int_t i) const {return fTimeStack[i];}
88 const Float_t* GetTimeStackP(Int_t i) const {return &fTimeStack[i];}
89 UInt_t GetQStack(Int_t i) const {return fQStack[i];}
90 const UInt_t* GetQStackP(Int_t i) const {return &fQStack[i];}
91 Double_t * GetPosition(Int_t index){return &fPositionStack[index*3];}
92 Double_t GetOldR() const {return fOldR;}
93 void SetOldR(Double_t r) {fOldR=r;}
96 AliTrackHitsParamV2 * GetParam() const {return fParam;}
97 void SetParam(AliTrackHitsParamV2 * p) {fParam=p;}
98 void UpdateParam(Double_t maxdelta); //recal
99 void NewParam(Double_t r, Double_t z, Double_t fi, Int_t q, Float_t time);
100 enum {kStackSize = 10000};
103 AliTPCTempHitInfoV2(const AliTPCTempHitInfoV2 &hit);
104 AliTPCTempHitInfoV2& operator = (const AliTPCTempHitInfoV2 &hit);
105 void Fit2(Double_t fSumY, Double_t fSumYX, Double_t fSumYX2,
106 Double_t fSumX, Double_t fSumX2, Double_t fSumX3,
107 Double_t fSumX4, Int_t n,
108 Double_t &a, Double_t &b, Double_t &c);
109 void Fit(AliTrackHitsParamV2 * param);
110 Double_t fSumDr; // Sum of Dr
111 Double_t fSumDr2; // Square of sum of Dr
112 Double_t fSumDr3; // Cube of sum of Dr
113 Double_t fSumDr4; // Fourth power of sum of Dr
114 Double_t fSumDFi; // Sum of DFi
115 Double_t fSumDFiDr; // Sum of DFiDr
116 Double_t fSumDFiDr2;// Sum of square of DFiDr
117 Double_t fSumDZ; // Sum of DZ
118 Double_t fSumDZDr; // Sum of DZDr
119 Double_t fSumDZDr2; // Sum of square of DZDr
120 Double_t fOldR; //previos r
121 Double_t fPositionStack[3*kStackSize]; //position stack
122 UInt_t fQStack[kStackSize]; //Q stack
123 Float_t fTimeStack[kStackSize]; //time stack
124 UInt_t fStackIndex; //current stack index
125 // UInt_t fInfoIndex; //current track info index
126 UInt_t fParamIndex; //current track parameters index
127 // AliTrackHitsInfo * fInfo; //current track info
128 AliTrackHitsParamV2 * fParam; //current track param
132 AliTPCTempHitInfoV2::AliTPCTempHitInfoV2()
135 // Standard constructor
136 // set to default value
138 fSumDr=fSumDr2=fSumDr3=fSumDr4=
139 fSumDFi=fSumDFiDr=fSumDFiDr2=
140 fSumDZ=fSumDZDr=fSumDZDr2=0;
147 void AliTPCTempHitInfoV2::NewParam(Double_t r, Double_t z, Double_t fi, Int_t q, Float_t time)
150 //reset stack and sum parameters
151 //store line initial point
153 fSumDr=fSumDr2=fSumDr3=fSumDr4=
154 fSumDFi=fSumDFiDr=fSumDFiDr2=
155 fSumDZ=fSumDZDr=fSumDZDr2=0;
163 fParam->SetTheta(0.);
164 fParam->SetThetaD(0.);
165 SetHit(r,z,fi,q,time);
168 void AliTPCTempHitInfoV2::SetHit(Double_t r, Double_t z, Double_t fi, Int_t q, Float_t time)
171 //add hit to the stack
172 //recalculate new estimete of line parameters
173 Double_t *f = GetPosition(fStackIndex);
177 fQStack[fStackIndex]=q;
178 fTimeStack[fStackIndex]=time;
179 if (fStackIndex==0) return;
180 Double_t dr = (r-fParam->GetR());
181 if (TMath::Abs(dr)<AliTPCTrackHitsV2::GetKPrecision()) dr =AliTPCTrackHitsV2::GetKPrecision();
182 Double_t dfi = fi-fParam->GetFi();
183 Double_t dz = z -fParam->GetZ();
185 Double_t dr3 =dr2*dr;
186 Double_t dr4 =dr3*dr;
198 //update fit parameters
200 Double_t det = fSumDr2*fSumDr4-fSumDr3*fSumDr3;
201 if (TMath::Abs(det)<AliTPCTrackHitsV2::GetKPrecision2()) return;
202 if ( ( fStackIndex>1 ) ){
203 fParam->SetAn((fSumDr4*fSumDFiDr-fSumDr3*fSumDFiDr2)/det);
204 fParam->SetAd((fSumDr2*fSumDFiDr2-fSumDr3*fSumDFiDr)/det);
207 fParam->SetAn(fSumDFiDr/fSumDr2);
208 if ( ( fStackIndex>1 ) ){
209 fParam->SetTheta((fSumDr4*fSumDZDr-fSumDr3*fSumDZDr2)/det);
210 fParam->SetThetaD((fSumDr2*fSumDZDr2-fSumDr3*fSumDZDr)/det);
213 fParam->SetTheta(fSumDZDr/fSumDr2);
217 void AliTPCTempHitInfoV2::UpdateParam(Double_t maxdelta)
220 // recalc parameters not fixing origin point
225 Fit2(fSumDFi, fSumDFiDr, fSumDFiDr2, fSumDr,fSumDr2,fSumDr3,fSumDr4,
227 if (TMath::Abs(a)<maxdelta){
228 fParam->SetFi(fParam->GetFi()+a/fParam->GetR());
232 Fit2(fSumDZ, fSumDZDr, fSumDZDr2, fSumDr,fSumDr2,fSumDr3,fSumDr4,
233 fStackIndex, a,b,c) ;
234 if (TMath::Abs(a)<maxdelta){
235 fParam->SetZ(fParam->GetZ()+a);
237 fParam->SetThetaD(c);
243 void AliTPCTempHitInfoV2::Fit2(Double_t fSumY, Double_t fSumYX, Double_t fSumYX2,
244 Double_t fSumX, Double_t fSumX2, Double_t fSumX3,
245 Double_t fSumX4, Int_t n,
246 Double_t &a, Double_t &b, Double_t &c)
249 // fit of second order
252 n* (fSumX2*fSumX4-fSumX3*fSumX3) -
253 fSumX* (fSumX*fSumX4-fSumX3*fSumX2)+
254 fSumX2* (fSumX*fSumX3-fSumX2*fSumX2);
256 if (TMath::Abs(det)> AliTPCTrackHitsV2::GetKPrecision()) {
258 (fSumY * (fSumX2*fSumX4-fSumX3*fSumX3)-
259 fSumX *(fSumYX*fSumX4-fSumYX2*fSumX3)+
260 fSumX2*(fSumYX*fSumX3-fSumYX2*fSumX2))/det;
262 (n*(fSumYX*fSumX4-fSumX3*fSumYX2)-
263 fSumY*(fSumX*fSumX4-fSumX3*fSumX2)+
264 fSumX2*(fSumX*fSumYX2-fSumYX*fSumX2))/det;
266 (n*(fSumX2*fSumYX2-fSumYX*fSumX3)-
267 fSumX*(fSumX*fSumYX2-fSumYX*fSumX2)+
268 fSumY*(fSumX*fSumX3-fSumX2*fSumX2))/det;
272 void AliTPCTempHitInfoV2::Fit(AliTrackHitsParamV2 * param)
275 // fit fixing first and the last point
276 // result stored in new param
278 Double_t dx2 = (GetPosition(fStackIndex))[0]-fParam->GetR();
279 Double_t det = fSumDr4+dx2*fSumDr2-2*dx2*fSumDr3;
280 if ( (TMath::Abs(det)> AliTPCTrackHitsV2::GetKPrecision()) &&
281 ((TMath::Abs(dx2)> AliTPCTrackHitsV2::GetKPrecision()))){
282 Double_t dfi2 = (GetPosition(fStackIndex))[1]-fParam->GetFi();
283 param->SetAd((fSumDFiDr2+dfi2*fSumDr-dx2*fSumDFiDr-dfi2*fSumDr3/dx2)/det);
284 param->SetAn((dfi2-param->GetAd()*dx2*dx2)/dx2);
286 Double_t dz2 = (GetPosition(fStackIndex))[1]-fParam->GetZ();
287 param->SetTheta((fSumDZDr2+dz2*fSumDr-dx2*fSumDZDr-dz2*fSumDr3/dx2)/det);
288 param->SetTheta((dz2-param->GetAd()*dx2*dx2)/dx2);
293 AliTrackHitsParamV2::AliTrackHitsParamV2()
296 // default constructor
306 AliTrackHitsParamV2::~AliTrackHitsParamV2()
309 // Standard destructor
313 delete[]fHitDistance;
326 Float_t AliTrackHitsParamV2::Eta() const
328 Float_t ctg = fZ / fR;
329 Float_t eta = -TMath::Log(TMath::Hypot(1,ctg)-TMath::Abs(ctg));
330 if(ctg < 0) eta = -eta;
335 AliTPCTrackHitsV2::AliTPCTrackHitsV2()
338 //default constructor
340 const Float_t kHitPrecision=0.002; //default precision for hit position in cm
341 const Float_t kStep =0.003; //30 mum step
342 const UShort_t kMaxDistance =100; //maximum distance 100
344 fPrecision=kHitPrecision; //precision in cm
345 fStep = kStep; //step size
346 fMaxDistance = kMaxDistance; //maximum distance
349 //fTrackHitsInfo = new AliObjectArray("AliTrackHitsInfo");
350 //fTrackHitsParam = new AliObjectArray("AliTrackHitsParamV2");
351 //fHitsPosAndQ = new TArrayOfArrayVStack("AliHitInfo");
352 fArray = new TClonesArray("AliTrackHitsParamV2");
353 fCurrentHit = new AliTPCCurrentHitV2;
362 AliTPCTrackHitsV2::~AliTPCTrackHitsV2()
367 // if (fTrackHitsInfo) delete fTrackHitsInfo;
372 //if (fHitsPosAndQ) delete fHitsPosAndQ;
373 if (fCurrentHit) delete fCurrentHit;
374 if (fTempInfo) delete fTempInfo;
387 void AliTPCTrackHitsV2::Clear(Option_t * /*option*/)
394 for (Int_t i=0;i<fArray->GetEntriesFast();i++){
395 AliTrackHitsParamV2 * par = (AliTrackHitsParamV2 *)fArray->UncheckedAt(i);
396 par->~AliTrackHitsParamV2(); // delete object
414 void AliTPCTrackHitsV2::AddHitKartez(Int_t volumeID, Int_t trackID, Double_t x,
415 Double_t y, Double_t z,Int_t q, Float_t time)
418 // add hit to the container - it add hit at the end - input in global coordinata
420 Double_t r = TMath::Sqrt(x*x+y*y);
421 Double_t fi = TMath::ACos(x/r);
423 AddHit(volumeID,trackID,r,z,fi,q,time);
427 void AliTPCTrackHitsV2::AddHit(Int_t volumeID, Int_t trackID,
428 Double_t r, Double_t z, Double_t fi, Int_t q, Float_t time)
435 if (!fTempInfo) { //initialisation of track - initialisation of parameters
436 fTempInfo = new AliTPCTempHitInfoV2;
437 fTempInfo->SetParam(new((*fArray)[0]) AliTrackHitsParamV2);
438 fTempInfo->GetParam()->SetVolumeID(volumeID);
439 fTempInfo->GetParam()->SetTrackID(trackID);
442 fTempInfo->SetParamIndex(0);
443 fTempInfo->NewParam(r,z,fi,q,time);
447 // if new volume or new trackID
448 if ( (volumeID!=fTempInfo->GetParam()->GetVolumeID()) ||
449 (trackID!=fTempInfo->GetParam()->GetTrackID())){
450 if (volumeID!=fTempInfo->GetParam()->GetVolumeID()) AddVolume(volumeID);
452 FlushHitStack(kTRUE);
454 fTempInfo->SetParamIndex(fTempInfo->GetParamIndex()+1);
455 fTempInfo->SetParam(new((*fArray)[fTempInfo->GetParamIndex()]) AliTrackHitsParamV2);
456 fTempInfo->GetParam()->SetVolumeID(volumeID);
457 fTempInfo->GetParam()->SetTrackID(trackID);
458 fTempInfo->NewParam(r,z,fi,q,time);
462 //calculate current fit precission to next point
463 AliTrackHitsParamV2 ¶m = *(fTempInfo->GetParam());
467 Double_t dr,dz,dfi,ddz,ddfi;
469 dr=dz=dfi=ddz=ddfi=0;
470 drhit = r-fTempInfo->GetOldR();
472 //Double_t dfi2 = param.fAn+2*param.fAd*(r-param.fR);
473 Double_t dfi2 = param.GetAn();
474 dfi2*=dfi2*fTempInfo->GetOldR()*fTempInfo->GetOldR();
475 //Double_t ddz2 = param.fTheta+2*param.fThetaD*(r-param.fR);
476 Double_t ddz2 = param.GetTheta();
478 ratio = TMath::Sqrt(1.+ dfi2+ ddz2);
481 // dl = fStep * Short_t(TMath::Nint(drhit*ratio/fStep)); // MI change - range check
482 dl = drhit*ratio/fStep;
483 if (TMath::Abs(dl)>32765) dl =0;
484 dl = fStep * Short_t(TMath::Nint(dl));
486 ddl = dl - drhit*ratio;
487 fTempInfo->SetOldR(fTempInfo->GetOldR()+dl/ratio);
489 if (fTempInfo->GetStackIndex()>2){
492 dfi = fi-param.GetFi();
493 ddz = dr*param.GetTheta()+dr*dr*param.GetThetaD()-dz;
494 ddfi= dr*param.GetAn()+dr*dr*param.GetAd()-dfi;
495 dd = TMath::Sqrt(ddz*ddz+r*r*ddfi*ddfi+ddl*ddl);
499 if ( ( (dd*1.25>fPrecision) ) ||
500 (fTempInfo->GetStackIndex()+4>fTempInfo->kStackSize) ||
501 (TMath::Abs(dl/fStep)>fMaxDistance) )
503 else{ // if precision OK
504 fTempInfo->SetStackIndex(fTempInfo->GetStackIndex()+1);
505 fTempInfo->SetHit(r,z,fi,q,time);
510 //if parameter changed
511 if (FlushHitStack(kFALSE)){ //if full buffer flushed
512 fTempInfo->SetParamIndex(fTempInfo->GetParamIndex()+1);
513 fTempInfo->SetParam(new((*fArray)[fTempInfo->GetParamIndex()]) AliTrackHitsParamV2);
514 fTempInfo->GetParam()->SetVolumeID(volumeID);
515 fTempInfo->GetParam()->SetTrackID(trackID);
516 fTempInfo->NewParam(r,z,fi,q,time);
519 fTempInfo->SetStackIndex(fTempInfo->GetStackIndex()+1);
520 fTempInfo->SetHit(r,z,fi,q,time);
524 Bool_t AliTPCTrackHitsV2::FlushHitStack(Bool_t force)
527 // write fHitsPosAndQ information from the stack to te arrays
529 if (!fTempInfo) return kFALSE;
531 AliTrackHitsParamV2 & param = *(fTempInfo->GetParam());
532 //recalculate track parameter not fixing first point
533 fTempInfo->UpdateParam(fStep/4.);
534 //fTempInfo->Fit(fTempInfo->fParam); //- fixing the first and the last point
536 Double_t oldr = param.GetR();
539 param.SetNHits(fTempInfo->GetStackIndex()+1);
540 // if (param.fHitDistance) delete []param.fHitDistance;
541 // if (param.fCharge) delete []param.fCharge;
542 // if (param.fTime) delete []param.fTime;
543 param.SetHitDistance(param.GetNHits());
544 param.SetCharge(param.GetNHits());
545 param.SetTime(param.GetNHits());
548 for (i=0; i <= fTempInfo->GetStackIndex(); i++){
549 Double_t * position = fTempInfo->GetPosition(i);
550 Double_t dr = position[0]-oldr;
553 //Double_t dfi2 = param.fAn+2*param.fAd*(position[0]-param.fR);
554 Double_t dfi2 = param.GetAn();
555 dfi2*=dfi2*oldr*oldr;
556 //Double_t ddz2 = param.fTheta+2*param.fThetaD*(position[0]-param.fR);
557 Double_t ddz2 = param.GetTheta();
559 ratio = TMath::Sqrt(1.+ dfi2+ ddz2);
562 // Double_t dl = fStep*(Short_t)TMath::Nint(dr*ratio/fStep); //MI change
563 Double_t dl = dr*ratio/fStep;
564 if (TMath::Abs(dl)>32765) dl =0;
565 dl = fStep * Short_t(TMath::Nint(dl));
569 //calculate precission
570 AliTrackHitsParamV2 ¶m = *(fTempInfo->GetParam());
572 Double_t dr1= position[0]-param.GetR();
573 Double_t dz = position[1]-param.GetZ();
574 Double_t dfi = position[2]-param.GetFi();
575 //extrapolated deltas
576 Double_t dr2 = oldr-param.GetR();
577 Double_t ddr = dr2-dr1;
578 Double_t ddz = dr2*param.GetTheta()+dr2*dr2*param.GetThetaD()-dz;
579 Double_t ddfi= dr2*param.GetAn()+dr2*dr2*param.GetAd()-dfi;
580 dd = TMath::Sqrt(ddz*ddz+oldr*oldr*ddfi*ddfi+ddr*ddr);
583 if ( (dd>fPrecision) ){
590 Double_t ddz = dr2*param.GetTheta()+dr2*dr2*param.GetThetaD()-dz;
591 Double_t ddfi= dr2*param.GetAn()+dr2*dr2*param.GetAd()-dfi;
593 dd = TMath::Sqrt(ddz*ddz+oldr*oldr*ddfi*ddfi+ddr*ddr);
599 param.HitDistance(i)= Short_t(TMath::Nint(dl/fStep));
600 param.Charge(i)= Short_t(fTempInfo->GetQStack(i));
601 param.Time(i)= Short_t(fTempInfo->GetTimeStack(i)/AliTPCTrackHitsV2::fgkTimePrecision);
604 if (i<=fTempInfo->GetStackIndex()){ //if previous iteration not succesfull
605 // Short_t * charge = new Short_t[i];
606 // Short_t * time = new Short_t[i];
607 // Short_t * hitDistance= new Short_t[i];
608 // memcpy(charge, param.fCharge,sizeof(Short_t)*i);
609 // memcpy(time, param.fTime,sizeof(Short_t)*i);
610 // memcpy(hitDistance, param.fHitDistance,sizeof(Short_t)*i);
611 // delete [] param.fCharge;
612 // delete [] param.fTime;
613 // delete [] param.fHitDistance;
615 param.ResizeCharge(i);
617 param.ResizeHitDistance(i);
619 Int_t volumeID = fTempInfo->GetParam()->GetVolumeID();
620 Int_t trackID =fTempInfo->GetParam()->GetTrackID();
621 fTempInfo->SetParamIndex(fTempInfo->GetParamIndex()+1);
622 fTempInfo->SetParam(new((*fArray)[fTempInfo->GetParamIndex()]) AliTrackHitsParamV2);
623 Double_t * p = fTempInfo->GetPosition(i);
624 UInt_t index2 = fTempInfo->GetStackIndex();
625 fTempInfo->NewParam(p[0],p[1],p[2],fTempInfo->GetQStack(i),fTempInfo->GetTimeStack(i));
626 fTempInfo->GetParam()->SetVolumeID(volumeID);
627 fTempInfo->GetParam()->SetTrackID(trackID);
628 if (i+1<=index2) FlushHitStack2(i+1,index2);
630 if (force) return FlushHitStack(kTRUE);
637 void AliTPCTrackHitsV2::FlushHitStack2(Int_t index1, Int_t index2)
640 // second iteration flush stack
641 // call only for hits where first iteration were not succesfully interpolated
643 Double_t * positionstack = new Double_t[3*(index2-index1+1)];
644 UInt_t * qstack = new UInt_t[index2-index1+1];
645 Float_t * timestack = new Float_t[index2-index1+1];
646 memcpy(positionstack, fTempInfo->GetPosition(index1),
647 (3*(index2-index1+1))*sizeof(Double_t));
648 memcpy(qstack, fTempInfo->GetQStackP(index1),(index2-index1+1)*sizeof(UInt_t));
649 memcpy(timestack, fTempInfo->GetTimeStackP(index1),(index2-index1+1)*sizeof(Float_t));
650 Double_t *p = positionstack;
651 for (Int_t j=0; j<=index2-index1;j++){
652 fTempInfo->SetStackIndex(fTempInfo->GetStackIndex()+1);
653 fTempInfo->SetHit(p[3*j+0],p[3*j+1],p[3*j+2],qstack[j],timestack[j]);
655 delete []positionstack;
661 void AliTPCTrackHitsV2::AddVolume(Int_t volume)
664 //add volumes to tthe list of volumes
666 Int_t * volumes = new Int_t[fNVolumes+1];
667 if (fVolumes) memcpy(volumes,fVolumes,(fNVolumes)*sizeof(Int_t));
668 volumes[fNVolumes]=volume;
670 if (fVolumes) delete []fVolumes;
675 Bool_t AliTPCTrackHitsV2::First()
678 //set Current hit for the first hit
681 if (fArray->GetSize()<=0) {
682 fCurrentHit->SetStatus(kFALSE);
686 AliTrackHitsParamV2 *param = (AliTrackHitsParamV2 *)fArray->At(0);
687 if (!fHit) fHit = new AliTPChit;
689 fCurrentHit->SetStatus(kFALSE);
693 fCurrentHit->SetParamIndex(0);
694 fCurrentHit->SetStackIndex(0);
697 ((AliTPChit*)fHit)->fSector = param->GetVolumeID();
698 ((AliTPChit*)fHit)->SetTrack(param->GetTrackID());
699 ((AliTPChit*)fHit)->SetX(param->GetR()*TMath::Cos(param->GetFi()));
700 ((AliTPChit*)fHit)->SetY(param->GetR()*TMath::Sin(param->GetFi()));
701 ((AliTPChit*)fHit)->SetZ(param->GetZ());
702 ((AliTPChit*)fHit)->fQ = param->Charge(0);
703 ((AliTPChit*)fHit)->fTime = (Float_t)(param->Time(0)*AliTPCTrackHitsV2::fgkTimePrecision);
705 fCurrentHit->fHit.fSector = param->fVolumeID;
706 fCurrentHit->fHit.SetTrack(param->fTrackID);
707 fCurrentHit->fHit.SetX(param->fR*TMath::Cos(param->fFi));
708 fCurrentHit->fHit.SetY(param->fR*TMath::Sin(param->fFi));
709 fCurrentHit->fHit.SetZ(param->fZ);
710 fCurrentHit->fHit.fQ = param->fCharge[0];
711 fCurrentHit->fHit.fTime = (Float_t)(param->fTime[0]*AliTPCTrackHitsV2::fgkTimePrecision);
713 fCurrentHit->SetR(param->GetR());
715 fCurrentHit->SetStatus(kTRUE);
716 return fCurrentHit->GetStatus();
719 Bool_t AliTPCTrackHitsV2::Next()
724 if (!(fCurrentHit->GetStatus()))
727 fCurrentHit->SetStackIndex(fCurrentHit->GetStackIndex()+1);
729 AliTrackHitsParamV2 *param = (AliTrackHitsParamV2 *)fArray->At(fCurrentHit->GetParamIndex());
730 if (fCurrentHit->GetStackIndex()>=param->GetNHits()){
731 fCurrentHit->SetParamIndex(fCurrentHit->GetParamIndex()+1);
732 if (fCurrentHit->GetParamIndex()>=fArray->GetEntriesFast()){
733 fCurrentHit->SetStatus(kFALSE);
736 param = (AliTrackHitsParamV2 *)fArray->At(fCurrentHit->GetParamIndex());
737 fCurrentHit->SetStackIndex(0);
738 fCurrentHit->SetR(param->GetR());
745 // Double_t dfi2 = param->fAn+2*param->fAd*(fCurrentHit->fR-param->fR);
746 Double_t dfi2 = param->GetAn();
747 dfi2*=dfi2*fCurrentHit->GetR()*fCurrentHit->GetR();
748 // Double_t ddz2 = param->fTheta+2*param->fThetaD*(fCurrentHit->fR-param->fR);
749 Double_t ddz2 = param->GetTheta();
751 ratio = TMath::Sqrt(1.+ dfi2+ ddz2);
754 fCurrentHit->SetR(fCurrentHit->GetR()+fStep*param->HitDistance(fCurrentHit->GetStackIndex())/ratio);
756 Double_t dR = fCurrentHit->GetR() - param->GetR();
757 Double_t fi = param->GetFi() + (param->GetAn()*dR+param->GetAd()*dR*dR);
758 Double_t z = param->GetZ() + (param->GetTheta()*dR+param->GetThetaD()*dR*dR);
760 fCurrentHit->fHit.fQ = param->fCharge[fCurrentHit->fStackIndex];
761 fCurrentHit->fHit.fTime = (Float_t)(param->fTime[fCurrentHit->fStackIndex]*AliTPCTrackHitsV2::fgkTimePrecision);
762 fCurrentHit->fHit.SetX(fCurrentHit->fR*TMath::Cos(fi));
763 fCurrentHit->fHit.SetY(fCurrentHit->fR*TMath::Sin(fi));
764 fCurrentHit->fHit.SetZ(z);
765 fCurrentHit->fHit.fSector = param->fVolumeID;
766 fCurrentHit->fHit.SetTrack(param->fTrackID);
768 ((AliTPChit*)fHit)->fQ = param->Charge(fCurrentHit->GetStackIndex());
769 ((AliTPChit*)fHit)->fTime = (Float_t)(param->Time(fCurrentHit->GetStackIndex())*AliTPCTrackHitsV2::fgkTimePrecision);
770 ((AliTPChit*)fHit)->SetX(fCurrentHit->GetR()*TMath::Cos(fi));
771 ((AliTPChit*)fHit)->SetY(fCurrentHit->GetR()*TMath::Sin(fi));
772 ((AliTPChit*)fHit)->SetZ(z);
773 ((AliTPChit*)fHit)->fSector = param->GetVolumeID();
774 ((AliTPChit*)fHit)->SetTrack(param->GetTrackID());
779 AliHit * AliTPCTrackHitsV2::GetHit() const
784 return (fCurrentHit->GetStatus())? fHit:0;
785 //return &fCurrentHit->fHit;
789 AliTrackHitsParamV2 * AliTPCTrackHitsV2::GetParam()
792 // Return current parameters
794 return (fCurrentHit->GetStatus())?
795 (AliTrackHitsParamV2 *)fArray->At(fCurrentHit->GetParamIndex()):0;