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
78 struct AliTPCTempHitInfoV2 {
79 friend class AliTPCTrackHitsV2;
81 enum { kStackSize = 10000};
82 AliTPCTempHitInfoV2();
83 AliTPCTempHitInfoV2(const AliTPCTempHitInfoV2 &hit)
85 AliTPCTempHitInfoV2& operator = (const AliTPCTempHitInfoV2 &hit)
86 {hit.Copy(*this); return (*this);}
87 void NewParam(Double_t r, Double_t z, Double_t fi, Int_t q);
88 void SetHit(Double_t r, Double_t z, Double_t fi, Int_t q);
89 Double_t * GetPosition(Int_t index){return &fPositionStack[index*3];}
90 void UpdateParam(Double_t maxdelta); //recal
91 void Fit2(Double_t fSumY, Double_t fSumYX, Double_t fSumYX2,
92 Double_t fSumX, Double_t fSumX2, Double_t fSumX3,
93 Double_t fSumX4, Int_t n,
94 Double_t &a, Double_t &b, Double_t &c);
95 void Fit(AliTrackHitsParamV2 * param);
96 Double_t fSumDr; // Sum of Dr
97 Double_t fSumDr2; // Square of sum of Dr
98 Double_t fSumDr3; // Cube of sum of Dr
99 Double_t fSumDr4; // Fourth power of sum of Dr
100 Double_t fSumDFi; // Sum of DFi
101 Double_t fSumDFiDr; // Sum of DFiDr
102 Double_t fSumDFiDr2;// Sum of square of DFiDr
103 Double_t fSumDZ; // Sum of DZ
104 Double_t fSumDZDr; // Sum of DZDr
105 Double_t fSumDZDr2; // Sum of square of DZDr
106 Double_t fOldR; //previos r
107 Double_t fPositionStack[3*kStackSize]; //position stack
108 UInt_t fQStack[kStackSize]; //Q stack
109 UInt_t fStackIndex; //current stack index
110 // UInt_t fInfoIndex; //current track info index
111 UInt_t fParamIndex; //current track parameters index
112 // AliTrackHitsInfo * fInfo; //current track info
113 AliTrackHitsParamV2 * fParam; //current track param
115 void Copy(AliTPCTempHitInfoV2 &) const
116 {printf("Not Implemented\n"); exit(1);}
120 AliTPCTempHitInfoV2::AliTPCTempHitInfoV2()
123 // Standard constructor
124 // set to default value
126 fSumDr=fSumDr2=fSumDr3=fSumDr4=
127 fSumDFi=fSumDFiDr=fSumDFiDr2=
128 fSumDZ=fSumDZDr=fSumDZDr2=0;
135 void AliTPCTempHitInfoV2::NewParam(Double_t r, Double_t z, Double_t fi, Int_t q)
138 //reset stack and sum parameters
139 //store line initial point
141 fSumDr=fSumDr2=fSumDr3=fSumDr4=
142 fSumDFi=fSumDFiDr=fSumDFiDr2=
143 fSumDZ=fSumDZDr=fSumDZDr2=0;
156 void AliTPCTempHitInfoV2::SetHit(Double_t r, Double_t z, Double_t fi, Int_t q)
159 //add hit to the stack
160 //recalculate new estimete of line parameters
161 Double_t *f = GetPosition(fStackIndex);
165 fQStack[fStackIndex]=q;
166 if (fStackIndex==0) return;
167 Double_t dr = (r-fParam->fR);
168 if (TMath::Abs(dr)<AliTPCTrackHitsV2::fgkPrecision) dr =AliTPCTrackHitsV2::fgkPrecision;
169 Double_t dfi = fi-fParam->fFi;
170 Double_t dz = z -fParam->fZ;
172 Double_t dr3 =dr2*dr;
173 Double_t dr4 =dr3*dr;
185 //update fit parameters
187 Double_t det = fSumDr2*fSumDr4-fSumDr3*fSumDr3;
188 if (TMath::Abs(det)<AliTPCTrackHitsV2::fgkPrecision2) return;
189 if ( ( fStackIndex>1 ) ){
190 fParam->fAn = (fSumDr4*fSumDFiDr-fSumDr3*fSumDFiDr2)/det;
191 fParam->fAd = (fSumDr2*fSumDFiDr2-fSumDr3*fSumDFiDr)/det;
194 fParam->fAn = fSumDFiDr/fSumDr2;
195 if ( ( fStackIndex>1 ) ){
196 fParam->fTheta = (fSumDr4*fSumDZDr-fSumDr3*fSumDZDr2)/det;
197 fParam->fThetaD= (fSumDr2*fSumDZDr2-fSumDr3*fSumDZDr)/det;
200 fParam->fTheta = fSumDZDr/fSumDr2;
204 void AliTPCTempHitInfoV2::UpdateParam(Double_t maxdelta)
207 // recalc parameters not fixing origin point
212 Fit2(fSumDFi, fSumDFiDr, fSumDFiDr2, fSumDr,fSumDr2,fSumDr3,fSumDr4,
214 if (TMath::Abs(a)<maxdelta){
215 fParam->fFi +=a/fParam->fR;
219 Fit2(fSumDZ, fSumDZDr, fSumDZDr2, fSumDr,fSumDr2,fSumDr3,fSumDr4,
220 fStackIndex, a,b,c) ;
221 if (TMath::Abs(a)<maxdelta){
230 void AliTPCTempHitInfoV2::Fit2(Double_t fSumY, Double_t fSumYX, Double_t fSumYX2,
231 Double_t fSumX, Double_t fSumX2, Double_t fSumX3,
232 Double_t fSumX4, Int_t n,
233 Double_t &a, Double_t &b, Double_t &c)
236 // fit of second order
239 n* (fSumX2*fSumX4-fSumX3*fSumX3) -
240 fSumX* (fSumX*fSumX4-fSumX3*fSumX2)+
241 fSumX2* (fSumX*fSumX3-fSumX2*fSumX2);
243 if (TMath::Abs(det)> AliTPCTrackHitsV2::fgkPrecision) {
245 (fSumY * (fSumX2*fSumX4-fSumX3*fSumX3)-
246 fSumX *(fSumYX*fSumX4-fSumYX2*fSumX3)+
247 fSumX2*(fSumYX*fSumX3-fSumYX2*fSumX2))/det;
249 (n*(fSumYX*fSumX4-fSumX3*fSumYX2)-
250 fSumY*(fSumX*fSumX4-fSumX3*fSumX2)+
251 fSumX2*(fSumX*fSumYX2-fSumYX*fSumX2))/det;
253 (n*(fSumX2*fSumYX2-fSumYX*fSumX3)-
254 fSumX*(fSumX*fSumYX2-fSumYX*fSumX2)+
255 fSumY*(fSumX*fSumX3-fSumX2*fSumX2))/det;
259 void AliTPCTempHitInfoV2::Fit(AliTrackHitsParamV2 * param)
262 // fit fixing first and the last point
263 // result stored in new param
265 Double_t dx2 = (GetPosition(fStackIndex))[0]-fParam->fR;
266 Double_t det = fSumDr4+dx2*fSumDr2-2*dx2*fSumDr3;
267 if ( (TMath::Abs(det)> AliTPCTrackHitsV2::fgkPrecision) &&
268 ((TMath::Abs(dx2)> AliTPCTrackHitsV2::fgkPrecision))){
269 Double_t dfi2 = (GetPosition(fStackIndex))[1]-fParam->fFi;
270 param->fAd = (fSumDFiDr2+dfi2*fSumDr-dx2*fSumDFiDr-dfi2*fSumDr3/dx2)/det;
271 param->fAn = (dfi2-param->fAd*dx2*dx2)/dx2;
273 Double_t dz2 = (GetPosition(fStackIndex))[1]-fParam->fZ;
274 param->fTheta = (fSumDZDr2+dz2*fSumDr-dx2*fSumDZDr-dz2*fSumDr3/dx2)/det;
275 param->fTheta = (dz2-param->fAd*dx2*dx2)/dx2;
280 AliTrackHitsParamV2::AliTrackHitsParamV2()
283 // default constructor
292 AliTrackHitsParamV2::~AliTrackHitsParamV2()
295 // Standard destructor
299 delete[]fHitDistance;
309 AliTPCTrackHitsV2::AliTPCTrackHitsV2()
312 //default constructor
314 const Float_t kHitPrecision=0.002; //default precision for hit position in cm
315 const Float_t kStep =0.003; //30 mum step
316 const UShort_t kMaxDistance =100; //maximum distance 100
318 fPrecision=kHitPrecision; //precision in cm
319 fStep = kStep; //step size
320 fMaxDistance = kMaxDistance; //maximum distance
323 //fTrackHitsInfo = new AliObjectArray("AliTrackHitsInfo");
324 //fTrackHitsParam = new AliObjectArray("AliTrackHitsParamV2");
325 //fHitsPosAndQ = new TArrayOfArrayVStack("AliHitInfo");
326 fArray = new TClonesArray("AliTrackHitsParamV2");
327 fCurrentHit = new AliTPCCurrentHitV2;
336 AliTPCTrackHitsV2::~AliTPCTrackHitsV2()
341 // if (fTrackHitsInfo) delete fTrackHitsInfo;
346 //if (fHitsPosAndQ) delete fHitsPosAndQ;
347 if (fCurrentHit) delete fCurrentHit;
348 if (fTempInfo) delete fTempInfo;
361 void AliTPCTrackHitsV2::Clear()
368 for (Int_t i=0;i<fArray->GetEntriesFast();i++){
369 AliTrackHitsParamV2 * par = (AliTrackHitsParamV2 *)fArray->UncheckedAt(i);
370 par->~AliTrackHitsParamV2(); // delete object
388 void AliTPCTrackHitsV2::AddHitKartez(Int_t volumeID, Int_t trackID, Double_t x,
389 Double_t y, Double_t z,Int_t q)
392 // add hit to the container - it add hit at the end - input in global coordinata
394 Double_t r = TMath::Sqrt(x*x+y*y);
395 Double_t fi = TMath::ACos(x/r);
397 AddHit(volumeID,trackID,r,z,fi,q);
401 void AliTPCTrackHitsV2::AddHit(Int_t volumeID, Int_t trackID,
402 Double_t r, Double_t z, Double_t fi, Int_t q)
409 if (!fTempInfo) { //initialisation of track - initialisation of parameters
410 fTempInfo = new AliTPCTempHitInfoV2;
411 fTempInfo->fParam = new((*fArray)[0]) AliTrackHitsParamV2;
412 fTempInfo->fParam->fVolumeID = volumeID;
413 fTempInfo->fParam->fTrackID = trackID;
416 fTempInfo->fParamIndex = 0;
417 fTempInfo->NewParam(r,z,fi,q);
421 // if new volume or new trackID
422 if ( (volumeID!=fTempInfo->fParam->fVolumeID) ||
423 (trackID!=fTempInfo->fParam->fTrackID)){
424 if (volumeID!=fTempInfo->fParam->fVolumeID) AddVolume(volumeID);
426 FlushHitStack(kTRUE);
428 fTempInfo->fParamIndex++;
429 fTempInfo->fParam = new((*fArray)[fTempInfo->fParamIndex]) AliTrackHitsParamV2;
430 fTempInfo->fParam->fVolumeID = volumeID;
431 fTempInfo->fParam->fTrackID = trackID;
432 fTempInfo->NewParam(r,z,fi,q);
436 //calculate current fit precission to next point
437 AliTrackHitsParamV2 ¶m = *(fTempInfo->fParam);
441 Double_t dr,dz,dfi,ddz,ddfi;
443 dr=dz=dfi=ddz=ddfi=0;
444 drhit = r-fTempInfo->fOldR;
446 //Double_t dfi2 = param.fAn+2*param.fAd*(r-param.fR);
447 Double_t dfi2 = param.fAn;
448 dfi2*=dfi2*fTempInfo->fOldR*fTempInfo->fOldR;
449 //Double_t ddz2 = param.fTheta+2*param.fThetaD*(r-param.fR);
450 Double_t ddz2 = param.fTheta;
452 ratio = TMath::Sqrt(1.+ dfi2+ ddz2);
455 // dl = fStep * Short_t(TMath::Nint(drhit*ratio/fStep)); // MI change - range check
456 dl = drhit*ratio/fStep;
457 if (TMath::Abs(dl)>32765) dl =0;
458 dl = fStep * Short_t(TMath::Nint(dl));
460 ddl = dl - drhit*ratio;
461 fTempInfo->fOldR += dl/ratio;
463 if (fTempInfo->fStackIndex>2){
467 ddz = dr*param.fTheta+dr*dr*param.fThetaD-dz;
468 ddfi= dr*param.fAn+dr*dr*param.fAd-dfi;
469 dd = TMath::Sqrt(ddz*ddz+r*r*ddfi*ddfi+ddl*ddl);
473 if ( ( (dd*1.25>fPrecision) ) ||
474 (fTempInfo->fStackIndex+4>fTempInfo->kStackSize) ||
475 (TMath::Abs(dl/fStep)>fMaxDistance) )
477 else{ // if precision OK
478 fTempInfo->fStackIndex++;
479 fTempInfo->SetHit(r,z,fi,q);
484 //if parameter changed
485 if (FlushHitStack(kFALSE)){ //if full buffer flushed
486 fTempInfo->fParamIndex++;
487 fTempInfo->fParam = new((*fArray)[fTempInfo->fParamIndex]) AliTrackHitsParamV2;
488 fTempInfo->fParam->fVolumeID = volumeID;
489 fTempInfo->fParam->fTrackID = trackID;
490 fTempInfo->NewParam(r,z,fi,q);
493 fTempInfo->fStackIndex++;
494 fTempInfo->SetHit(r,z,fi,q);
498 Bool_t AliTPCTrackHitsV2::FlushHitStack(Bool_t force)
501 // write fHitsPosAndQ information from the stack to te arrays
503 if (!fTempInfo) return kFALSE;
505 AliTrackHitsParamV2 & param = *(fTempInfo->fParam);
506 //recalculate track parameter not fixing first point
507 fTempInfo->UpdateParam(fStep/4.);
508 //fTempInfo->Fit(fTempInfo->fParam); //- fixing the first and the last point
510 Double_t oldr = param.fR;
513 param.fNHits = fTempInfo->fStackIndex+1;
514 if (param.fHitDistance) delete []param.fHitDistance;
515 if (param.fCharge) delete []param.fCharge;
516 param.fHitDistance = new Short_t[param.fNHits];
517 param.fCharge = new Short_t[param.fNHits];
520 for (i=0; i <= fTempInfo->fStackIndex; i++){
521 Double_t * position = fTempInfo->GetPosition(i);
522 Double_t dr = position[0]-oldr;
525 //Double_t dfi2 = param.fAn+2*param.fAd*(position[0]-param.fR);
526 Double_t dfi2 = param.fAn;
527 dfi2*=dfi2*oldr*oldr;
528 //Double_t ddz2 = param.fTheta+2*param.fThetaD*(position[0]-param.fR);
529 Double_t ddz2 = param.fTheta;
531 ratio = TMath::Sqrt(1.+ dfi2+ ddz2);
534 // Double_t dl = fStep*(Short_t)TMath::Nint(dr*ratio/fStep); //MI change
535 Double_t dl = dr*ratio/fStep;
536 if (TMath::Abs(dl)>32765) dl =0;
537 dl = fStep * Short_t(TMath::Nint(dl));
541 //calculate precission
542 AliTrackHitsParamV2 ¶m = *(fTempInfo->fParam);
544 Double_t dr1= position[0]-param.fR;
545 Double_t dz = position[1]-param.fZ;
546 Double_t dfi = position[2]-param.fFi;
547 //extrapolated deltas
548 Double_t dr2 = oldr-param.fR;
549 Double_t ddr = dr2-dr1;
550 Double_t ddz = dr2*param.fTheta+dr2*dr2*param.fThetaD-dz;
551 Double_t ddfi= dr2*param.fAn+dr2*dr2*param.fAd-dfi;
552 dd = TMath::Sqrt(ddz*ddz+oldr*oldr*ddfi*ddfi+ddr*ddr);
555 if ( (dd>fPrecision) ){
562 Double_t ddz = dr2*param.fTheta+dr2*dr2*param.fThetaD-dz;
563 Double_t ddfi= dr2*param.fAn+dr2*dr2*param.fAd-dfi;
565 dd = TMath::Sqrt(ddz*ddz+oldr*oldr*ddfi*ddfi+ddr*ddr);
571 param.fHitDistance[i]= Short_t(TMath::Nint(dl/fStep));
572 param.fCharge[i]= Short_t(fTempInfo->fQStack[i]);
575 if (i<=fTempInfo->fStackIndex){ //if previous iteration not succesfull
576 Short_t * charge = new Short_t[i];
577 Short_t * hitDistance= new Short_t[i];
578 memcpy(charge, param.fCharge,sizeof(Short_t)*i);
579 memcpy(hitDistance, param.fHitDistance,sizeof(Short_t)*i);
580 delete [] param.fCharge;
581 delete [] param.fHitDistance;
583 param.fCharge = charge;
584 param.fHitDistance = hitDistance;
586 Int_t volumeID = fTempInfo->fParam->fVolumeID;
587 Int_t trackID =fTempInfo->fParam->fTrackID;
588 fTempInfo->fParamIndex++;
589 fTempInfo->fParam = new((*fArray)[fTempInfo->fParamIndex]) AliTrackHitsParamV2;
590 Double_t * p = fTempInfo->GetPosition(i);
591 UInt_t index2 = fTempInfo->fStackIndex;
592 fTempInfo->NewParam(p[0],p[1],p[2],fTempInfo->fQStack[i]);
593 fTempInfo->fParam->fVolumeID= volumeID;
594 fTempInfo->fParam->fTrackID= trackID;
595 if (i+1<=index2) FlushHitStack2(i+1,index2);
597 if (force) return FlushHitStack(kTRUE);
604 void AliTPCTrackHitsV2::FlushHitStack2(Int_t index1, Int_t index2)
607 // second iteration flush stack
608 // call only for hits where first iteration were not succesfully interpolated
610 Double_t * positionstack = new Double_t[3*(index2-index1+1)];
611 UInt_t * qstack = new UInt_t[index2-index1+1];
612 memcpy(positionstack, &fTempInfo->fPositionStack[3*index1],
613 (3*(index2-index1+1))*sizeof(Double_t));
614 memcpy(qstack, &fTempInfo->fQStack[index1],(index2-index1+1)*sizeof(UInt_t));
615 Double_t *p = positionstack;
616 for (Int_t j=0; j<=index2-index1;j++){
617 fTempInfo->fStackIndex++;
618 fTempInfo->SetHit(p[3*j+0],p[3*j+1],p[3*j+2],qstack[j]);
620 delete []positionstack;
625 void AliTPCTrackHitsV2::AddVolume(Int_t volume)
628 //add volumes to tthe list of volumes
630 Int_t * volumes = new Int_t[fNVolumes+1];
631 if (fVolumes) memcpy(volumes,fVolumes,(fNVolumes)*sizeof(Int_t));
632 volumes[fNVolumes]=volume;
634 if (fVolumes) delete []fVolumes;
639 Bool_t AliTPCTrackHitsV2::First()
642 //set Current hit for the first hit
645 if (fArray->GetSize()<=0) {
646 fCurrentHit->fStatus = kFALSE;
650 AliTrackHitsParamV2 *param = (AliTrackHitsParamV2 *)fArray->At(0);
651 if (!fHit) fHit = new AliTPChit;
653 fCurrentHit->fStatus = kFALSE;
657 fCurrentHit->fParamIndex = 0;
658 fCurrentHit->fStackIndex = 0;
661 ((AliTPChit*)fHit)->fSector = param->fVolumeID;
662 ((AliTPChit*)fHit)->SetTrack(param->fTrackID);
663 ((AliTPChit*)fHit)->SetX(param->fR*TMath::Cos(param->fFi));
664 ((AliTPChit*)fHit)->SetY(param->fR*TMath::Sin(param->fFi));
665 ((AliTPChit*)fHit)->SetZ(param->fZ);
666 ((AliTPChit*)fHit)->fQ = param->fCharge[0];
668 fCurrentHit->fHit.fSector = param->fVolumeID;
669 fCurrentHit->fHit.SetTrack(param->fTrackID);
670 fCurrentHit->fHit.SetX(param->fR*TMath::Cos(param->fFi));
671 fCurrentHit->fHit.SetY(param->fR*TMath::Sin(param->fFi));
672 fCurrentHit->fHit.SetZ(param->fZ);
673 fCurrentHit->fHit.fQ = param->fCharge[0];
675 fCurrentHit->fR = param->fR;
677 return fCurrentHit->fStatus = kTRUE;
680 Bool_t AliTPCTrackHitsV2::Next()
685 if (!(fCurrentHit->fStatus))
688 fCurrentHit->fStackIndex++;
690 AliTrackHitsParamV2 *param = (AliTrackHitsParamV2 *)fArray->At(fCurrentHit->fParamIndex);
691 if (fCurrentHit->fStackIndex>=param->fNHits){
692 fCurrentHit->fParamIndex++;
693 if (fCurrentHit->fParamIndex>=fArray->GetEntriesFast()){
694 fCurrentHit->fStatus=kFALSE;
697 param = (AliTrackHitsParamV2 *)fArray->At(fCurrentHit->fParamIndex);
698 fCurrentHit->fStackIndex=0;
699 fCurrentHit->fR = param->fR;
706 // Double_t dfi2 = param->fAn+2*param->fAd*(fCurrentHit->fR-param->fR);
707 Double_t dfi2 = param->fAn;
708 dfi2*=dfi2*fCurrentHit->fR*fCurrentHit->fR;
709 // Double_t ddz2 = param->fTheta+2*param->fThetaD*(fCurrentHit->fR-param->fR);
710 Double_t ddz2 = param->fTheta;
712 ratio = TMath::Sqrt(1.+ dfi2+ ddz2);
715 fCurrentHit->fR += fStep*param->fHitDistance[fCurrentHit->fStackIndex]/ratio;
717 Double_t dR = fCurrentHit->fR - param->fR;
718 Double_t fi = param->fFi + (param->fAn*dR+param->fAd*dR*dR);
719 Double_t z = param->fZ + (param->fTheta*dR+param->fThetaD*dR*dR);
721 fCurrentHit->fHit.fQ = param->fCharge[fCurrentHit->fStackIndex];
722 fCurrentHit->fHit.SetX(fCurrentHit->fR*TMath::Cos(fi));
723 fCurrentHit->fHit.SetY(fCurrentHit->fR*TMath::Sin(fi));
724 fCurrentHit->fHit.SetZ(z);
725 fCurrentHit->fHit.fSector = param->fVolumeID;
726 fCurrentHit->fHit.SetTrack(param->fTrackID);
728 ((AliTPChit*)fHit)->fQ = param->fCharge[fCurrentHit->fStackIndex];
729 ((AliTPChit*)fHit)->SetX(fCurrentHit->fR*TMath::Cos(fi));
730 ((AliTPChit*)fHit)->SetY(fCurrentHit->fR*TMath::Sin(fi));
731 ((AliTPChit*)fHit)->SetZ(z);
732 ((AliTPChit*)fHit)->fSector = param->fVolumeID;
733 ((AliTPChit*)fHit)->SetTrack(param->fTrackID);
738 AliHit * AliTPCTrackHitsV2::GetHit() const
743 return (fCurrentHit->fStatus)? fHit:0;
744 //return &fCurrentHit->fHit;
748 AliTrackHitsParamV2 * AliTPCTrackHitsV2::GetParam()
751 // Return current parameters
753 return (fCurrentHit->fStatus)?
754 (AliTrackHitsParamV2 *)fArray->At(fCurrentHit->fParamIndex):0;