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 "TVector3.h"
57 #include "AliTPCTrackHitsV2.h"
59 #include "TClonesArray.h"
62 #include <Riostream.h>
66 ClassImp(AliTPCTrackHitsV2)
67 ClassImp(AliTrackHitsParamV2)
70 Int_t AliTrackHitsParamV2::fgCounter1 =0;
71 Int_t AliTrackHitsParamV2::fgCounter2 =0;
73 Int_t AliTPCTrackHitsV2::fgCounter1 =0;
74 Int_t AliTPCTrackHitsV2::fgCounter2 =0;
76 const Double_t AliTPCTrackHitsV2::fgkPrecision=1e-6; //precision
77 const Double_t AliTPCTrackHitsV2::fgkPrecision2=1e-20; //precision
82 struct AliTPCTempHitInfoV2 {
83 enum { kStackSize = 10000};
84 AliTPCTempHitInfoV2();
85 AliTPCTempHitInfoV2(const AliTPCTempHitInfoV2 &hit)
87 AliTPCTempHitInfoV2& operator = (const AliTPCTempHitInfoV2 &hit)
88 {hit.Copy(*this); return (*this);}
89 void NewParam(Double_t r, Double_t z, Double_t fi, Int_t q);
90 void SetHit(Double_t r, Double_t z, Double_t fi, Int_t q);
91 Double_t * GetPosition(Int_t index){return &fPositionStack[index*3];}
92 void UpdateParam(Double_t maxdelta); //recal
93 void Fit2(Double_t fSumY, Double_t fSumYX, Double_t fSumYX2,
94 Double_t fSumX, Double_t fSumX2, Double_t fSumX3,
95 Double_t fSumX4, Int_t n,
96 Double_t &a, Double_t &b, Double_t &c);
97 void Fit(AliTrackHitsParamV2 * param);
98 Double_t fSumDr; // Sum of Dr
99 Double_t fSumDr2; // Square of sum of Dr
100 Double_t fSumDr3; // Cube of sum of Dr
101 Double_t fSumDr4; // Fourth power of sum of Dr
102 Double_t fSumDFi; // Sum of DFi
103 Double_t fSumDFiDr; // Sum of DFiDr
104 Double_t fSumDFiDr2;// Sum of square of DFiDr
105 Double_t fSumDZ; // Sum of DZ
106 Double_t fSumDZDr; // Sum of DZDr
107 Double_t fSumDZDr2; // Sum of square of DZDr
108 Double_t fOldR; //previos r
109 Double_t fPositionStack[3*kStackSize]; //position stack
110 UInt_t fQStack[kStackSize]; //Q stack
111 UInt_t fStackIndex; //current stack index
112 // UInt_t fInfoIndex; //current track info index
113 UInt_t fParamIndex; //current track parameters index
114 // AliTrackHitsInfo * fInfo; //current track info
115 AliTrackHitsParamV2 * fParam; //current track param
117 void Copy(AliTPCTempHitInfoV2 &) const
118 {printf("Not Implemented\n"); exit(1);}
122 AliTPCTempHitInfoV2::AliTPCTempHitInfoV2()
125 // Standard constructor
126 // set to default value
128 fSumDr=fSumDr2=fSumDr3=fSumDr4=
129 fSumDFi=fSumDFiDr=fSumDFiDr2=
130 fSumDZ=fSumDZDr=fSumDZDr2=0;
137 void AliTPCTempHitInfoV2::NewParam(Double_t r, Double_t z, Double_t fi, Int_t q)
140 //reset stack and sum parameters
141 //store line initial point
143 fSumDr=fSumDr2=fSumDr3=fSumDr4=
144 fSumDFi=fSumDFiDr=fSumDFiDr2=
145 fSumDZ=fSumDZDr=fSumDZDr2=0;
158 void AliTPCTempHitInfoV2::SetHit(Double_t r, Double_t z, Double_t fi, Int_t q)
161 //add hit to the stack
162 //recalculate new estimete of line parameters
163 Double_t *f = GetPosition(fStackIndex);
167 fQStack[fStackIndex]=q;
168 if (fStackIndex==0) return;
169 Double_t dr = (r-fParam->fR);
170 if (TMath::Abs(dr)<AliTPCTrackHitsV2::fgkPrecision) dr =AliTPCTrackHitsV2::fgkPrecision;
171 Double_t dfi = fi-fParam->fFi;
172 Double_t dz = z -fParam->fZ;
174 Double_t dr3 =dr2*dr;
175 Double_t dr4 =dr3*dr;
187 //update fit parameters
189 Double_t det = fSumDr2*fSumDr4-fSumDr3*fSumDr3;
190 if (TMath::Abs(det)<AliTPCTrackHitsV2::fgkPrecision2) return;
191 if ( ( fStackIndex>1 ) ){
192 fParam->fAn = (fSumDr4*fSumDFiDr-fSumDr3*fSumDFiDr2)/det;
193 fParam->fAd = (fSumDr2*fSumDFiDr2-fSumDr3*fSumDFiDr)/det;
196 fParam->fAn = fSumDFiDr/fSumDr2;
197 if ( ( fStackIndex>1 ) ){
198 fParam->fTheta = (fSumDr4*fSumDZDr-fSumDr3*fSumDZDr2)/det;
199 fParam->fThetaD= (fSumDr2*fSumDZDr2-fSumDr3*fSumDZDr)/det;
202 fParam->fTheta = fSumDZDr/fSumDr2;
206 void AliTPCTempHitInfoV2::UpdateParam(Double_t maxdelta)
209 // recalc parameters not fixing origin point
214 Fit2(fSumDFi, fSumDFiDr, fSumDFiDr2, fSumDr,fSumDr2,fSumDr3,fSumDr4,
216 if (TMath::Abs(a)<maxdelta){
217 fParam->fFi +=a/fParam->fR;
221 Fit2(fSumDZ, fSumDZDr, fSumDZDr2, fSumDr,fSumDr2,fSumDr3,fSumDr4,
222 fStackIndex, a,b,c) ;
223 if (TMath::Abs(a)<maxdelta){
232 void AliTPCTempHitInfoV2::Fit2(Double_t fSumY, Double_t fSumYX, Double_t fSumYX2,
233 Double_t fSumX, Double_t fSumX2, Double_t fSumX3,
234 Double_t fSumX4, Int_t n,
235 Double_t &a, Double_t &b, Double_t &c)
238 // fit of second order
241 n* (fSumX2*fSumX4-fSumX3*fSumX3) -
242 fSumX* (fSumX*fSumX4-fSumX3*fSumX2)+
243 fSumX2* (fSumX*fSumX3-fSumX2*fSumX2);
245 if (TMath::Abs(det)> AliTPCTrackHitsV2::fgkPrecision) {
247 (fSumY * (fSumX2*fSumX4-fSumX3*fSumX3)-
248 fSumX *(fSumYX*fSumX4-fSumYX2*fSumX3)+
249 fSumX2*(fSumYX*fSumX3-fSumYX2*fSumX2))/det;
251 (n*(fSumYX*fSumX4-fSumX3*fSumYX2)-
252 fSumY*(fSumX*fSumX4-fSumX3*fSumX2)+
253 fSumX2*(fSumX*fSumYX2-fSumYX*fSumX2))/det;
255 (n*(fSumX2*fSumYX2-fSumYX*fSumX3)-
256 fSumX*(fSumX*fSumYX2-fSumYX*fSumX2)+
257 fSumY*(fSumX*fSumX3-fSumX2*fSumX2))/det;
261 void AliTPCTempHitInfoV2::Fit(AliTrackHitsParamV2 * param)
264 // fit fixing first and the last point
265 // result stored in new param
267 Double_t dx2 = (GetPosition(fStackIndex))[0]-fParam->fR;
268 Double_t det = fSumDr4+dx2*fSumDr2-2*dx2*fSumDr3;
269 if ( (TMath::Abs(det)> AliTPCTrackHitsV2::fgkPrecision) &&
270 ((TMath::Abs(dx2)> AliTPCTrackHitsV2::fgkPrecision))){
271 Double_t dfi2 = (GetPosition(fStackIndex))[1]-fParam->fFi;
272 param->fAd = (fSumDFiDr2+dfi2*fSumDr-dx2*fSumDFiDr-dfi2*fSumDr3/dx2)/det;
273 param->fAn = (dfi2-param->fAd*dx2*dx2)/dx2;
275 Double_t dz2 = (GetPosition(fStackIndex))[1]-fParam->fZ;
276 param->fTheta = (fSumDZDr2+dz2*fSumDr-dx2*fSumDZDr-dz2*fSumDr3/dx2)/det;
277 param->fTheta = (dz2-param->fAd*dx2*dx2)/dx2;
282 AliTrackHitsParamV2::AliTrackHitsParamV2()
285 // default constructor
294 AliTrackHitsParamV2::~AliTrackHitsParamV2()
297 // Standard destructor
301 delete[]fHitDistance;
311 AliTPCTrackHitsV2::AliTPCTrackHitsV2()
314 //default constructor
316 const Float_t kHitPrecision=0.002; //default precision for hit position in cm
317 const Float_t kStep =0.003; //30 mum step
318 const UShort_t kMaxDistance =100; //maximum distance 100
320 fPrecision=kHitPrecision; //precision in cm
321 fStep = kStep; //step size
322 fMaxDistance = kMaxDistance; //maximum distance
325 //fTrackHitsInfo = new AliObjectArray("AliTrackHitsInfo");
326 //fTrackHitsParam = new AliObjectArray("AliTrackHitsParamV2");
327 //fHitsPosAndQ = new TArrayOfArrayVStack("AliHitInfo");
328 fArray = new TClonesArray("AliTrackHitsParamV2");
329 fCurrentHit = new AliTPCCurrentHitV2;
338 AliTPCTrackHitsV2::~AliTPCTrackHitsV2()
343 // if (fTrackHitsInfo) delete fTrackHitsInfo;
348 //if (fHitsPosAndQ) delete fHitsPosAndQ;
349 if (fCurrentHit) delete fCurrentHit;
350 if (fTempInfo) delete fTempInfo;
363 void AliTPCTrackHitsV2::Clear()
370 for (Int_t i=0;i<fArray->GetEntriesFast();i++){
371 AliTrackHitsParamV2 * par = (AliTrackHitsParamV2 *)fArray->UncheckedAt(i);
372 par->~AliTrackHitsParamV2(); // delete object
390 void AliTPCTrackHitsV2::AddHitKartez(Int_t volumeID, Int_t trackID, Double_t x,
391 Double_t y, Double_t z,Int_t q)
394 // add hit to the container - it add hit at the end - input in global coordinata
396 Double_t r = TMath::Sqrt(x*x+y*y);
397 Double_t fi = TMath::ACos(x/r);
399 AddHit(volumeID,trackID,r,z,fi,q);
403 void AliTPCTrackHitsV2::AddHit(Int_t volumeID, Int_t trackID,
404 Double_t r, Double_t z, Double_t fi, Int_t q)
411 if (!fTempInfo) { //initialisation of track - initialisation of parameters
412 fTempInfo = new AliTPCTempHitInfoV2;
413 fTempInfo->fParam = new((*fArray)[0]) AliTrackHitsParamV2;
414 fTempInfo->fParam->fVolumeID = volumeID;
415 fTempInfo->fParam->fTrackID = trackID;
418 fTempInfo->fParamIndex = 0;
419 fTempInfo->NewParam(r,z,fi,q);
423 // if new volume or new trackID
424 if ( (volumeID!=fTempInfo->fParam->fVolumeID) ||
425 (trackID!=fTempInfo->fParam->fTrackID)){
426 if (volumeID!=fTempInfo->fParam->fVolumeID) AddVolume(volumeID);
428 FlushHitStack(kTRUE);
430 fTempInfo->fParamIndex++;
431 fTempInfo->fParam = new((*fArray)[fTempInfo->fParamIndex]) AliTrackHitsParamV2;
432 fTempInfo->fParam->fVolumeID = volumeID;
433 fTempInfo->fParam->fTrackID = trackID;
434 fTempInfo->NewParam(r,z,fi,q);
438 //calculate current fit precission to next point
439 AliTrackHitsParamV2 ¶m = *(fTempInfo->fParam);
443 Double_t dr,dz,dfi,ddz,ddfi;
445 dr=dz=dfi=ddz=ddfi=0;
446 drhit = r-fTempInfo->fOldR;
448 //Double_t dfi2 = param.fAn+2*param.fAd*(r-param.fR);
449 Double_t dfi2 = param.fAn;
450 dfi2*=dfi2*fTempInfo->fOldR*fTempInfo->fOldR;
451 //Double_t ddz2 = param.fTheta+2*param.fThetaD*(r-param.fR);
452 Double_t ddz2 = param.fTheta;
454 ratio = TMath::Sqrt(1.+ dfi2+ ddz2);
457 // dl = fStep * Short_t(TMath::Nint(drhit*ratio/fStep)); // MI change - range check
458 dl = drhit*ratio/fStep;
459 if (TMath::Abs(dl)>32765) dl =0;
460 dl = fStep * Short_t(TMath::Nint(dl));
462 ddl = dl - drhit*ratio;
463 fTempInfo->fOldR += dl/ratio;
465 if (fTempInfo->fStackIndex>2){
469 ddz = dr*param.fTheta+dr*dr*param.fThetaD-dz;
470 ddfi= dr*param.fAn+dr*dr*param.fAd-dfi;
471 dd = TMath::Sqrt(ddz*ddz+r*r*ddfi*ddfi+ddl*ddl);
475 if ( ( (dd*1.25>fPrecision) ) ||
476 (fTempInfo->fStackIndex+4>fTempInfo->kStackSize) ||
477 (TMath::Abs(dl/fStep)>fMaxDistance) )
479 else{ // if precision OK
480 fTempInfo->fStackIndex++;
481 fTempInfo->SetHit(r,z,fi,q);
486 //if parameter changed
487 if (FlushHitStack(kFALSE)){ //if full buffer flushed
488 fTempInfo->fParamIndex++;
489 fTempInfo->fParam = new((*fArray)[fTempInfo->fParamIndex]) AliTrackHitsParamV2;
490 fTempInfo->fParam->fVolumeID = volumeID;
491 fTempInfo->fParam->fTrackID = trackID;
492 fTempInfo->NewParam(r,z,fi,q);
495 fTempInfo->fStackIndex++;
496 fTempInfo->SetHit(r,z,fi,q);
500 Bool_t AliTPCTrackHitsV2::FlushHitStack(Bool_t force)
503 // write fHitsPosAndQ information from the stack to te arrays
505 if (!fTempInfo) return kFALSE;
507 AliTrackHitsParamV2 & param = *(fTempInfo->fParam);
508 //recalculate track parameter not fixing first point
509 fTempInfo->UpdateParam(fStep/4.);
510 //fTempInfo->Fit(fTempInfo->fParam); //- fixing the first and the last point
512 Double_t oldr = param.fR;
515 param.fNHits = fTempInfo->fStackIndex+1;
516 if (param.fHitDistance) delete []param.fHitDistance;
517 if (param.fCharge) delete []param.fCharge;
518 param.fHitDistance = new Short_t[param.fNHits];
519 param.fCharge = new Short_t[param.fNHits];
522 for (i=0; i <= fTempInfo->fStackIndex; i++){
523 Double_t * position = fTempInfo->GetPosition(i);
524 Double_t dr = position[0]-oldr;
527 //Double_t dfi2 = param.fAn+2*param.fAd*(position[0]-param.fR);
528 Double_t dfi2 = param.fAn;
529 dfi2*=dfi2*oldr*oldr;
530 //Double_t ddz2 = param.fTheta+2*param.fThetaD*(position[0]-param.fR);
531 Double_t ddz2 = param.fTheta;
533 ratio = TMath::Sqrt(1.+ dfi2+ ddz2);
536 // Double_t dl = fStep*(Short_t)TMath::Nint(dr*ratio/fStep); //MI change
537 Double_t dl = dr*ratio/fStep;
538 if (TMath::Abs(dl)>32765) dl =0;
539 dl = fStep * Short_t(TMath::Nint(dl));
543 //calculate precission
544 AliTrackHitsParamV2 ¶m = *(fTempInfo->fParam);
546 Double_t dr1= position[0]-param.fR;
547 Double_t dz = position[1]-param.fZ;
548 Double_t dfi = position[2]-param.fFi;
549 //extrapolated deltas
550 Double_t dr2 = oldr-param.fR;
551 Double_t ddr = dr2-dr1;
552 Double_t ddz = dr2*param.fTheta+dr2*dr2*param.fThetaD-dz;
553 Double_t ddfi= dr2*param.fAn+dr2*dr2*param.fAd-dfi;
554 dd = TMath::Sqrt(ddz*ddz+oldr*oldr*ddfi*ddfi+ddr*ddr);
557 if ( (dd>fPrecision) ){
564 Double_t ddz = dr2*param.fTheta+dr2*dr2*param.fThetaD-dz;
565 Double_t ddfi= dr2*param.fAn+dr2*dr2*param.fAd-dfi;
567 dd = TMath::Sqrt(ddz*ddz+oldr*oldr*ddfi*ddfi+ddr*ddr);
573 param.fHitDistance[i]= Short_t(TMath::Nint(dl/fStep));
574 param.fCharge[i]= Short_t(fTempInfo->fQStack[i]);
577 if (i<=fTempInfo->fStackIndex){ //if previous iteration not succesfull
578 Short_t * charge = new Short_t[i];
579 Short_t * hitDistance= new Short_t[i];
580 memcpy(charge, param.fCharge,sizeof(Short_t)*i);
581 memcpy(hitDistance, param.fHitDistance,sizeof(Short_t)*i);
582 delete [] param.fCharge;
583 delete [] param.fHitDistance;
585 param.fCharge = charge;
586 param.fHitDistance = hitDistance;
588 Int_t volumeID = fTempInfo->fParam->fVolumeID;
589 Int_t trackID =fTempInfo->fParam->fTrackID;
590 fTempInfo->fParamIndex++;
591 fTempInfo->fParam = new((*fArray)[fTempInfo->fParamIndex]) AliTrackHitsParamV2;
592 Double_t * p = fTempInfo->GetPosition(i);
593 UInt_t index2 = fTempInfo->fStackIndex;
594 fTempInfo->NewParam(p[0],p[1],p[2],fTempInfo->fQStack[i]);
595 fTempInfo->fParam->fVolumeID= volumeID;
596 fTempInfo->fParam->fTrackID= trackID;
597 if (i+1<=index2) FlushHitStack2(i+1,index2);
599 if (force) return FlushHitStack(kTRUE);
606 void AliTPCTrackHitsV2::FlushHitStack2(Int_t index1, Int_t index2)
609 // second iteration flush stack
610 // call only for hits where first iteration were not succesfully interpolated
612 Double_t * positionstack = new Double_t[3*(index2-index1+1)];
613 UInt_t * qstack = new UInt_t[index2-index1+1];
614 memcpy(positionstack, &fTempInfo->fPositionStack[3*index1],
615 (3*(index2-index1+1))*sizeof(Double_t));
616 memcpy(qstack, &fTempInfo->fQStack[index1],(index2-index1+1)*sizeof(UInt_t));
617 Double_t *p = positionstack;
618 for (Int_t j=0; j<=index2-index1;j++){
619 fTempInfo->fStackIndex++;
620 fTempInfo->SetHit(p[3*j+0],p[3*j+1],p[3*j+2],qstack[j]);
622 delete []positionstack;
627 void AliTPCTrackHitsV2::AddVolume(Int_t volume)
630 //add volumes to tthe list of volumes
632 Int_t * volumes = new Int_t[fNVolumes+1];
633 if (fVolumes) memcpy(volumes,fVolumes,(fNVolumes)*sizeof(Int_t));
634 volumes[fNVolumes]=volume;
636 if (fVolumes) delete []fVolumes;
641 Bool_t AliTPCTrackHitsV2::First()
644 //set Current hit for the first hit
647 if (fArray->GetSize()<=0) {
648 fCurrentHit->fStatus = kFALSE;
652 AliTrackHitsParamV2 *param = (AliTrackHitsParamV2 *)fArray->At(0);
653 if (!fHit) fHit = new AliTPChit;
655 fCurrentHit->fStatus = kFALSE;
659 fCurrentHit->fParamIndex = 0;
660 fCurrentHit->fStackIndex = 0;
663 ((AliTPChit*)fHit)->fSector = param->fVolumeID;
664 ((AliTPChit*)fHit)->SetTrack(param->fTrackID);
665 ((AliTPChit*)fHit)->SetX(param->fR*TMath::Cos(param->fFi));
666 ((AliTPChit*)fHit)->SetY(param->fR*TMath::Sin(param->fFi));
667 ((AliTPChit*)fHit)->SetZ(param->fZ);
668 ((AliTPChit*)fHit)->fQ = param->fCharge[0];
670 fCurrentHit->fHit.fSector = param->fVolumeID;
671 fCurrentHit->fHit.SetTrack(param->fTrackID);
672 fCurrentHit->fHit.SetX(param->fR*TMath::Cos(param->fFi));
673 fCurrentHit->fHit.SetY(param->fR*TMath::Sin(param->fFi));
674 fCurrentHit->fHit.SetZ(param->fZ);
675 fCurrentHit->fHit.fQ = param->fCharge[0];
677 fCurrentHit->fR = param->fR;
679 return fCurrentHit->fStatus = kTRUE;
682 Bool_t AliTPCTrackHitsV2::Next()
687 if (!(fCurrentHit->fStatus))
690 fCurrentHit->fStackIndex++;
692 AliTrackHitsParamV2 *param = (AliTrackHitsParamV2 *)fArray->At(fCurrentHit->fParamIndex);
693 if (fCurrentHit->fStackIndex>=param->fNHits){
694 fCurrentHit->fParamIndex++;
695 if (fCurrentHit->fParamIndex>=fArray->GetEntriesFast()){
696 fCurrentHit->fStatus=kFALSE;
699 param = (AliTrackHitsParamV2 *)fArray->At(fCurrentHit->fParamIndex);
700 fCurrentHit->fStackIndex=0;
701 fCurrentHit->fR = param->fR;
708 // Double_t dfi2 = param->fAn+2*param->fAd*(fCurrentHit->fR-param->fR);
709 Double_t dfi2 = param->fAn;
710 dfi2*=dfi2*fCurrentHit->fR*fCurrentHit->fR;
711 // Double_t ddz2 = param->fTheta+2*param->fThetaD*(fCurrentHit->fR-param->fR);
712 Double_t ddz2 = param->fTheta;
714 ratio = TMath::Sqrt(1.+ dfi2+ ddz2);
717 fCurrentHit->fR += fStep*param->fHitDistance[fCurrentHit->fStackIndex]/ratio;
719 Double_t dR = fCurrentHit->fR - param->fR;
720 Double_t fi = param->fFi + (param->fAn*dR+param->fAd*dR*dR);
721 Double_t z = param->fZ + (param->fTheta*dR+param->fThetaD*dR*dR);
723 fCurrentHit->fHit.fQ = param->fCharge[fCurrentHit->fStackIndex];
724 fCurrentHit->fHit.SetX(fCurrentHit->fR*TMath::Cos(fi));
725 fCurrentHit->fHit.SetY(fCurrentHit->fR*TMath::Sin(fi));
726 fCurrentHit->fHit.SetZ(z);
727 fCurrentHit->fHit.fSector = param->fVolumeID;
728 fCurrentHit->fHit.SetTrack(param->fTrackID);
730 ((AliTPChit*)fHit)->fQ = param->fCharge[fCurrentHit->fStackIndex];
731 ((AliTPChit*)fHit)->SetX(fCurrentHit->fR*TMath::Cos(fi));
732 ((AliTPChit*)fHit)->SetY(fCurrentHit->fR*TMath::Sin(fi));
733 ((AliTPChit*)fHit)->SetZ(z);
734 ((AliTPChit*)fHit)->fSector = param->fVolumeID;
735 ((AliTPChit*)fHit)->SetTrack(param->fTrackID);
740 AliHit * AliTPCTrackHitsV2::GetHit() const
745 return (fCurrentHit->fStatus)? fHit:0;
746 //return &fCurrentHit->fHit;
750 AliTrackHitsParamV2 * AliTPCTrackHitsV2::GetParam()
753 // Return current parameters
755 return (fCurrentHit->fStatus)?
756 (AliTrackHitsParamV2 *)fArray->At(fCurrentHit->fParamIndex):0;