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 Revision 1.4 2002/03/01 10:19:06 hristov
19 Additional protection (M.Ivanov)
21 Revision 1.1 2002/01/21 17:14:21 kowal2
22 New track hits using root containers.
25 ///////////////////////////////////////////////////////////////////////////////
27 // Time Projection Chamber track hits object //
29 // Origin: Marian Ivanov , GSI Darmstadt
32 // Container for Track Hits - based on standard TClonesArray -
33 // fArray of AliTPCTrackHitsParamV2
34 // In AliTPCTrackHitsParamV2 - parameterization of the track segment is stored
35 // for each of the track segment - relative position ( distance between hits) and
36 // charge of the hits is stored - comparing to classical TClonesArray of AliTPChit -
37 // comperssion factor of 5-7 (depending on the required precision) -
38 // In future release AliTPCTrackHitsV2 - will replace old AliTPCTrackHits - which were not
39 // based on standard ROOT containers
41 // // during building Container
42 // AddHitKartez(Int_t volumeID, Int_t trackID, Double_t x, Double_t y, Double_t z,Int_t q)
43 // void SetHitPrecision(Double_t prec) {fPrecision=prec;}
44 // void SetStepPrecision(Double_t prec) {fStep=prec;}
45 // Bool_t FlushHitStack(Bool_t force=kTRUE);
46 // //at the end necessary to have Container in consistent state
48 // // looping over Container
49 // Bool_t First(), Bool_t Next() - iterators - return status of the operation
50 // AliTPChit * GetHit(); - return current hit
55 <img src="gif/AliTPCTrackHitsV2.gif">
60 ///////////////////////////////////////////////////////////////////////////////
62 //#include "TVector3.h"
63 #include "AliTPCTrackHitsV2.h"
65 #include "TClonesArray.h"
72 ClassImp(AliTPCTrackHitsV2)
73 ClassImp(AliTrackHitsParamV2)
76 Int_t AliTrackHitsParamV2::fgCounter1 =0;
77 Int_t AliTrackHitsParamV2::fgCounter2 =0;
79 Int_t AliTPCTrackHitsV2::fgCounter1 =0;
80 Int_t AliTPCTrackHitsV2::fgCounter2 =0;
82 const Double_t AliTPCTrackHitsV2::fgkPrecision=1e-6; //precision
83 const Double_t AliTPCTrackHitsV2::fgkPrecision2=1e-20; //precision
88 struct AliTPCTempHitInfoV2 {
89 enum { fkStackSize = 10000};
90 AliTPCTempHitInfoV2();
91 void NewParam(Double_t r, Double_t z, Double_t fi, Int_t q);
92 void SetHit(Double_t r, Double_t z, Double_t fi, Int_t q);
93 Double_t * GetPosition(Int_t index){return &fPositionStack[index*3];}
94 void UpdateParam(Double_t maxdelta); //recal
95 void Fit2(Double_t fSumY, Double_t fSumYX, Double_t fSumYX2,
96 Double_t fSumX, Double_t fSumX2, Double_t fSumX3,
97 Double_t fSumX4, Int_t n,
98 Double_t &a, Double_t &b, Double_t &c);
99 void Fit(AliTrackHitsParamV2 * param);
105 Double_t fSumDFiDr; //
106 Double_t fSumDFiDr2;//
108 Double_t fSumDZDr; //
109 Double_t fSumDZDr2; //
110 Double_t fOldR; //previos r
111 Double_t fPositionStack[3*fkStackSize]; //position stack
112 UInt_t fQStack[fkStackSize]; //Q stack
113 UInt_t fStackIndex; //current stack index
114 // UInt_t fInfoIndex; //current track info index
115 UInt_t fParamIndex; //current track parameters index
116 // AliTrackHitsInfo * fInfo; //current track info
117 AliTrackHitsParamV2 * fParam; //current track param
121 AliTPCTempHitInfoV2::AliTPCTempHitInfoV2()
124 //set to default value
125 fSumDr=fSumDr2=fSumDr3=fSumDr4=
126 fSumDFi=fSumDFiDr=fSumDFiDr2=
127 fSumDZ=fSumDZDr=fSumDZDr2=0;
134 void AliTPCTempHitInfoV2::NewParam(Double_t r, Double_t z, Double_t fi, Int_t q)
137 //reset stack and sum parameters
138 //store line initial point
139 fSumDr=fSumDr2=fSumDr3=fSumDr4=
140 fSumDFi=fSumDFiDr=fSumDFiDr2=
141 fSumDZ=fSumDZDr=fSumDZDr2=0;
154 void AliTPCTempHitInfoV2::SetHit(Double_t r, Double_t z, Double_t fi, Int_t q)
157 //add hit to the stack
158 //recalculate new estimete of line parameters
159 Double_t *f = GetPosition(fStackIndex);
163 fQStack[fStackIndex]=q;
164 if (fStackIndex==0) return;
165 Double_t dr = (r-fParam->fR);
166 if (TMath::Abs(dr)<AliTPCTrackHitsV2::fgkPrecision) dr =AliTPCTrackHitsV2::fgkPrecision;
167 Double_t dfi = fi-fParam->fFi;
168 Double_t dz = z -fParam->fZ;
170 Double_t dr3 =dr2*dr;
171 Double_t dr4 =dr3*dr;
183 //update fit parameters
185 Double_t det = fSumDr2*fSumDr4-fSumDr3*fSumDr3;
186 if (TMath::Abs(det)<AliTPCTrackHitsV2::fgkPrecision2) return;
187 if ( ( fStackIndex>1 ) ){
188 fParam->fAn = (fSumDr4*fSumDFiDr-fSumDr3*fSumDFiDr2)/det;
189 fParam->fAd = (fSumDr2*fSumDFiDr2-fSumDr3*fSumDFiDr)/det;
192 fParam->fAn = fSumDFiDr/fSumDr2;
193 if ( ( fStackIndex>1 ) ){
194 fParam->fTheta = (fSumDr4*fSumDZDr-fSumDr3*fSumDZDr2)/det;
195 fParam->fThetaD= (fSumDr2*fSumDZDr2-fSumDr3*fSumDZDr)/det;
198 fParam->fTheta = fSumDZDr/fSumDr2;
202 void AliTPCTempHitInfoV2::UpdateParam(Double_t maxdelta)
204 //recalc parameters not fixing origin point
208 Fit2(fSumDFi, fSumDFiDr, fSumDFiDr2, fSumDr,fSumDr2,fSumDr3,fSumDr4,
210 if (TMath::Abs(a)<maxdelta){
211 fParam->fFi +=a/fParam->fR;
215 Fit2(fSumDZ, fSumDZDr, fSumDZDr2, fSumDr,fSumDr2,fSumDr3,fSumDr4,
216 fStackIndex, a,b,c) ;
217 if (TMath::Abs(a)<maxdelta){
225 void AliTPCTempHitInfoV2::Fit2(Double_t fSumY, Double_t fSumYX, Double_t fSumYX2,
226 Double_t fSumX, Double_t fSumX2, Double_t fSumX3,
227 Double_t fSumX4, Int_t n,
228 Double_t &a, Double_t &b, Double_t &c)
230 //fit of second order
232 n* (fSumX2*fSumX4-fSumX3*fSumX3) -
233 fSumX* (fSumX*fSumX4-fSumX3*fSumX2)+
234 fSumX2* (fSumX*fSumX3-fSumX2*fSumX2);
236 if (TMath::Abs(det)> AliTPCTrackHitsV2::fgkPrecision) {
238 (fSumY * (fSumX2*fSumX4-fSumX3*fSumX3)-
239 fSumX *(fSumYX*fSumX4-fSumYX2*fSumX3)+
240 fSumX2*(fSumYX*fSumX3-fSumYX2*fSumX2))/det;
242 (n*(fSumYX*fSumX4-fSumX3*fSumYX2)-
243 fSumY*(fSumX*fSumX4-fSumX3*fSumX2)+
244 fSumX2*(fSumX*fSumYX2-fSumYX*fSumX2))/det;
246 (n*(fSumX2*fSumYX2-fSumYX*fSumX3)-
247 fSumX*(fSumX*fSumYX2-fSumYX*fSumX2)+
248 fSumY*(fSumX*fSumX3-fSumX2*fSumX2))/det;
252 void AliTPCTempHitInfoV2::Fit(AliTrackHitsParamV2 * param)
254 // fit fixing first and the last point
255 //result stored in new param
256 Double_t dx2 = (GetPosition(fStackIndex))[0]-fParam->fR;
257 Double_t det = fSumDr4+dx2*fSumDr2-2*dx2*fSumDr3;
258 if ( (TMath::Abs(det)> AliTPCTrackHitsV2::fgkPrecision) &&
259 ((TMath::Abs(dx2)> AliTPCTrackHitsV2::fgkPrecision))){
260 Double_t dfi2 = (GetPosition(fStackIndex))[1]-fParam->fFi;
261 param->fAd = (fSumDFiDr2+dfi2*fSumDr-dx2*fSumDFiDr-dfi2*fSumDr3/dx2)/det;
262 param->fAn = (dfi2-param->fAd*dx2*dx2)/dx2;
264 Double_t dz2 = (GetPosition(fStackIndex))[1]-fParam->fZ;
265 param->fTheta = (fSumDZDr2+dz2*fSumDr-dx2*fSumDZDr-dz2*fSumDr3/dx2)/det;
266 param->fTheta = (dz2-param->fAd*dx2*dx2)/dx2;
271 AliTrackHitsParamV2::AliTrackHitsParamV2()
273 //default constructor
280 AliTrackHitsParamV2::~AliTrackHitsParamV2()
284 delete[]fHitDistance;
294 AliTPCTrackHitsV2::AliTPCTrackHitsV2()
297 //default constructor
299 const Float_t kHitPrecision=0.002; //default precision for hit position in cm
300 const Float_t kStep =0.003; //30 mum step
301 const UShort_t kMaxDistance =100; //maximum distance 100
303 fPrecision=kHitPrecision; //precision in cm
304 fStep = kStep; //step size
305 fMaxDistance = kMaxDistance; //maximum distance
308 //fTrackHitsInfo = new AliObjectArray("AliTrackHitsInfo");
309 //fTrackHitsParam = new AliObjectArray("AliTrackHitsParamV2");
310 //fHitsPosAndQ = new TArrayOfArrayVStack("AliHitInfo");
311 fArray = new TClonesArray("AliTrackHitsParamV2");
312 fCurrentHit = new AliTPCCurrentHitV2;
321 AliTPCTrackHitsV2::~AliTPCTrackHitsV2()
326 // if (fTrackHitsInfo) delete fTrackHitsInfo;
331 //if (fHitsPosAndQ) delete fHitsPosAndQ;
332 if (fCurrentHit) delete fCurrentHit;
333 if (fTempInfo) delete fTempInfo;
346 void AliTPCTrackHitsV2::Clear()
352 for (Int_t i=0;i<fArray->GetEntriesFast();i++){
353 AliTrackHitsParamV2 * par = (AliTrackHitsParamV2 *)fArray->UncheckedAt(i);
354 par->~AliTrackHitsParamV2(); // delete object
372 void AliTPCTrackHitsV2::AddHitKartez(Int_t volumeID, Int_t trackID, Double_t x,
373 Double_t y, Double_t z,Int_t q)
376 //add hit to the container - it add hit at the end - input in global coordinata
377 Double_t r = TMath::Sqrt(x*x+y*y);
378 Double_t fi = TMath::ACos(x/r);
380 AddHit(volumeID,trackID,r,z,fi,q);
384 void AliTPCTrackHitsV2::AddHit(Int_t volumeID, Int_t trackID,
385 Double_t r, Double_t z, Double_t fi, Int_t q)
390 if (!fTempInfo) { //initialisation of track - initialisation of parameters
391 fTempInfo = new AliTPCTempHitInfoV2;
392 fTempInfo->fParam = new((*fArray)[0]) AliTrackHitsParamV2;
393 fTempInfo->fParam->fVolumeID = volumeID;
394 fTempInfo->fParam->fTrackID = trackID;
397 fTempInfo->fParamIndex = 0;
398 fTempInfo->NewParam(r,z,fi,q);
402 // if new volume or new trackID
403 if ( (volumeID!=fTempInfo->fParam->fVolumeID) ||
404 (trackID!=fTempInfo->fParam->fTrackID)){
405 if (volumeID!=fTempInfo->fParam->fVolumeID) AddVolume(volumeID);
407 FlushHitStack(kTRUE);
409 fTempInfo->fParamIndex++;
410 fTempInfo->fParam = new((*fArray)[fTempInfo->fParamIndex]) AliTrackHitsParamV2;
411 fTempInfo->fParam->fVolumeID = volumeID;
412 fTempInfo->fParam->fTrackID = trackID;
413 fTempInfo->NewParam(r,z,fi,q);
417 //calculate current fit precission to next point
418 AliTrackHitsParamV2 ¶m = *(fTempInfo->fParam);
422 Double_t dr,dz,dfi,ddz,ddfi;
424 dr=dz=dfi=ddz=ddfi=0;
425 drhit = r-fTempInfo->fOldR;
427 //Double_t dfi2 = param.fAn+2*param.fAd*(r-param.fR);
428 Double_t dfi2 = param.fAn;
429 dfi2*=dfi2*fTempInfo->fOldR*fTempInfo->fOldR;
430 //Double_t ddz2 = param.fTheta+2*param.fThetaD*(r-param.fR);
431 Double_t ddz2 = param.fTheta;
433 ratio = TMath::Sqrt(1.+ dfi2+ ddz2);
436 // dl = fStep * Short_t(TMath::Nint(drhit*ratio/fStep)); // MI change - range check
437 dl = drhit*ratio/fStep;
438 if (TMath::Abs(dl)>32765) dl =0;
439 dl = fStep * Short_t(TMath::Nint(dl));
441 ddl = dl - drhit*ratio;
442 fTempInfo->fOldR += dl/ratio;
444 if (fTempInfo->fStackIndex>2){
448 ddz = dr*param.fTheta+dr*dr*param.fThetaD-dz;
449 ddfi= dr*param.fAn+dr*dr*param.fAd-dfi;
450 dd = TMath::Sqrt(ddz*ddz+r*r*ddfi*ddfi+ddl*ddl);
454 if ( ( (dd*1.25>fPrecision) ) ||
455 (fTempInfo->fStackIndex+4>fTempInfo->fkStackSize) ||
456 (TMath::Abs(dl/fStep)>fMaxDistance) )
458 else{ // if precision OK
459 fTempInfo->fStackIndex++;
460 fTempInfo->SetHit(r,z,fi,q);
465 //if parameter changed
466 if (FlushHitStack(kFALSE)){ //if full buffer flushed
467 fTempInfo->fParamIndex++;
468 fTempInfo->fParam = new((*fArray)[fTempInfo->fParamIndex]) AliTrackHitsParamV2;
469 fTempInfo->fParam->fVolumeID = volumeID;
470 fTempInfo->fParam->fTrackID = trackID;
471 fTempInfo->NewParam(r,z,fi,q);
474 fTempInfo->fStackIndex++;
475 fTempInfo->SetHit(r,z,fi,q);
479 Bool_t AliTPCTrackHitsV2::FlushHitStack(Bool_t force)
482 //write fHitsPosAndQ information from the stack to te arrays
483 if (!fTempInfo) return kFALSE;
485 AliTrackHitsParamV2 & param = *(fTempInfo->fParam);
486 //recalculate track parameter not fixing first point
487 fTempInfo->UpdateParam(fStep/4.);
488 //fTempInfo->Fit(fTempInfo->fParam); //- fixing the first and the last point
490 Double_t oldr = param.fR;
493 param.fNHits = fTempInfo->fStackIndex+1;
494 if (param.fHitDistance) delete []param.fHitDistance;
495 if (param.fCharge) delete []param.fCharge;
496 param.fHitDistance = new Short_t[param.fNHits];
497 param.fCharge = new Short_t[param.fNHits];
500 for (i=0; i <= fTempInfo->fStackIndex; i++){
501 Double_t * position = fTempInfo->GetPosition(i);
502 Double_t dr = position[0]-oldr;
505 //Double_t dfi2 = param.fAn+2*param.fAd*(position[0]-param.fR);
506 Double_t dfi2 = param.fAn;
507 dfi2*=dfi2*oldr*oldr;
508 //Double_t ddz2 = param.fTheta+2*param.fThetaD*(position[0]-param.fR);
509 Double_t ddz2 = param.fTheta;
511 ratio = TMath::Sqrt(1.+ dfi2+ ddz2);
514 // Double_t dl = fStep*(Short_t)TMath::Nint(dr*ratio/fStep); //MI change
515 Double_t dl = dr*ratio/fStep;
516 if (TMath::Abs(dl)>32765) dl =0;
517 dl = fStep * Short_t(TMath::Nint(dl));
521 //calculate precission
522 AliTrackHitsParamV2 ¶m = *(fTempInfo->fParam);
524 Double_t dr1= position[0]-param.fR;
525 Double_t dz = position[1]-param.fZ;
526 Double_t dfi = position[2]-param.fFi;
527 //extrapolated deltas
528 Double_t dr2 = oldr-param.fR;
529 Double_t ddr = dr2-dr1;
530 Double_t ddz = dr2*param.fTheta+dr2*dr2*param.fThetaD-dz;
531 Double_t ddfi= dr2*param.fAn+dr2*dr2*param.fAd-dfi;
532 dd = TMath::Sqrt(ddz*ddz+oldr*oldr*ddfi*ddfi+ddr*ddr);
535 if ( (dd>fPrecision) ){
542 Double_t ddz = dr2*param.fTheta+dr2*dr2*param.fThetaD-dz;
543 Double_t ddfi= dr2*param.fAn+dr2*dr2*param.fAd-dfi;
545 dd = TMath::Sqrt(ddz*ddz+oldr*oldr*ddfi*ddfi+ddr*ddr);
551 param.fHitDistance[i]= Short_t(TMath::Nint(dl/fStep));
552 param.fCharge[i]= Short_t(fTempInfo->fQStack[i]);
555 if (i<=fTempInfo->fStackIndex){ //if previous iteration not succesfull
556 Short_t * charge = new Short_t[i];
557 Short_t * hitDistance= new Short_t[i];
558 memcpy(charge, param.fCharge,sizeof(Short_t)*i);
559 memcpy(hitDistance, param.fHitDistance,sizeof(Short_t)*i);
560 delete [] param.fCharge;
561 delete [] param.fHitDistance;
563 param.fCharge = charge;
564 param.fHitDistance = hitDistance;
566 Int_t volumeID = fTempInfo->fParam->fVolumeID;
567 Int_t trackID =fTempInfo->fParam->fTrackID;
568 fTempInfo->fParamIndex++;
569 fTempInfo->fParam = new((*fArray)[fTempInfo->fParamIndex]) AliTrackHitsParamV2;
570 Double_t * p = fTempInfo->GetPosition(i);
571 UInt_t index2 = fTempInfo->fStackIndex;
572 fTempInfo->NewParam(p[0],p[1],p[2],fTempInfo->fQStack[i]);
573 fTempInfo->fParam->fVolumeID= volumeID;
574 fTempInfo->fParam->fTrackID= trackID;
575 if (i+1<=index2) FlushHitStack2(i+1,index2);
577 if (force) return FlushHitStack(kTRUE);
584 void AliTPCTrackHitsV2::FlushHitStack2(Int_t index1, Int_t index2)
587 // second iteration flush stack
588 // call only for hits where first iteration were not succesfully interpolated
589 Double_t * positionstack = new Double_t[3*(index2-index1+1)];
590 UInt_t * qstack = new UInt_t[index2-index1+1];
591 memcpy(positionstack, &fTempInfo->fPositionStack[3*index1],
592 (3*(index2-index1+1))*sizeof(Double_t));
593 memcpy(qstack, &fTempInfo->fQStack[index1],(index2-index1+1)*sizeof(UInt_t));
594 Double_t *p = positionstack;
595 for (Int_t j=0; j<=index2-index1;j++){
596 fTempInfo->fStackIndex++;
597 fTempInfo->SetHit(p[3*j+0],p[3*j+1],p[3*j+2],qstack[j]);
599 delete []positionstack;
604 void AliTPCTrackHitsV2::AddVolume(Int_t volume)
607 //add volumes to tthe list of volumes
608 Int_t * volumes = new Int_t[fNVolumes+1];
609 if (fVolumes) memcpy(volumes,fVolumes,(fNVolumes+1)*sizeof(Int_t));
610 volumes[fNVolumes]=volume;
612 if (fVolumes) delete []fVolumes;
620 Bool_t AliTPCTrackHitsV2::First()
623 //set Current hit for the first hit
626 if (fArray->GetSize()<=0) {
627 fCurrentHit->fStatus = kFALSE;
631 AliTrackHitsParamV2 *param = (AliTrackHitsParamV2 *)fArray->At(0);
632 if (!fHit) fHit = new AliTPChit;
634 fCurrentHit->fStatus = kFALSE;
638 fCurrentHit->fParamIndex = 0;
639 fCurrentHit->fStackIndex = 0;
642 ((AliTPChit*)fHit)->fSector = param->fVolumeID;
643 ((AliTPChit*)fHit)->SetTrack(param->fTrackID);
644 ((AliTPChit*)fHit)->SetX(param->fR*TMath::Cos(param->fFi));
645 ((AliTPChit*)fHit)->SetY(param->fR*TMath::Sin(param->fFi));
646 ((AliTPChit*)fHit)->SetZ(param->fZ);
647 ((AliTPChit*)fHit)->fQ = param->fCharge[0];
649 fCurrentHit->fHit.fSector = param->fVolumeID;
650 fCurrentHit->fHit.SetTrack(param->fTrackID);
651 fCurrentHit->fHit.SetX(param->fR*TMath::Cos(param->fFi));
652 fCurrentHit->fHit.SetY(param->fR*TMath::Sin(param->fFi));
653 fCurrentHit->fHit.SetZ(param->fZ);
654 fCurrentHit->fHit.fQ = param->fCharge[0];
656 fCurrentHit->fR = param->fR;
658 return fCurrentHit->fStatus = kTRUE;
661 Bool_t AliTPCTrackHitsV2::Next()
665 if (!(fCurrentHit->fStatus))
668 fCurrentHit->fStackIndex++;
670 AliTrackHitsParamV2 *param = (AliTrackHitsParamV2 *)fArray->At(fCurrentHit->fParamIndex);
671 if (fCurrentHit->fStackIndex>=param->fNHits){
672 fCurrentHit->fParamIndex++;
673 if (fCurrentHit->fParamIndex>=fArray->GetEntriesFast()){
674 fCurrentHit->fStatus=kFALSE;
677 param = (AliTrackHitsParamV2 *)fArray->At(fCurrentHit->fParamIndex);
678 fCurrentHit->fStackIndex=0;
679 fCurrentHit->fR = param->fR;
686 // Double_t dfi2 = param->fAn+2*param->fAd*(fCurrentHit->fR-param->fR);
687 Double_t dfi2 = param->fAn;
688 dfi2*=dfi2*fCurrentHit->fR*fCurrentHit->fR;
689 // Double_t ddz2 = param->fTheta+2*param->fThetaD*(fCurrentHit->fR-param->fR);
690 Double_t ddz2 = param->fTheta;
692 ratio = TMath::Sqrt(1.+ dfi2+ ddz2);
695 fCurrentHit->fR += fStep*param->fHitDistance[fCurrentHit->fStackIndex]/ratio;
697 Double_t dR = fCurrentHit->fR - param->fR;
698 Double_t fi = param->fFi + (param->fAn*dR+param->fAd*dR*dR);
699 Double_t z = param->fZ + (param->fTheta*dR+param->fThetaD*dR*dR);
701 fCurrentHit->fHit.fQ = param->fCharge[fCurrentHit->fStackIndex];
702 fCurrentHit->fHit.SetX(fCurrentHit->fR*TMath::Cos(fi));
703 fCurrentHit->fHit.SetY(fCurrentHit->fR*TMath::Sin(fi));
704 fCurrentHit->fHit.SetZ(z);
705 fCurrentHit->fHit.fSector = param->fVolumeID;
706 fCurrentHit->fHit.SetTrack(param->fTrackID);
708 ((AliTPChit*)fHit)->fQ = param->fCharge[fCurrentHit->fStackIndex];
709 ((AliTPChit*)fHit)->SetX(fCurrentHit->fR*TMath::Cos(fi));
710 ((AliTPChit*)fHit)->SetY(fCurrentHit->fR*TMath::Sin(fi));
711 ((AliTPChit*)fHit)->SetZ(z);
712 ((AliTPChit*)fHit)->fSector = param->fVolumeID;
713 ((AliTPChit*)fHit)->SetTrack(param->fTrackID);
718 AliHit * AliTPCTrackHitsV2::GetHit()
721 return (fCurrentHit->fStatus)? fHit:0;
722 //return &fCurrentHit->fHit;
726 AliTrackHitsParamV2 * AliTPCTrackHitsV2::GetParam()
728 return (fCurrentHit->fStatus)? (AliTrackHitsParamV2 *)fArray->At(fCurrentHit->fParamIndex):0;