/**************************************************************************
* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
* *
* Author: The ALICE Off-line Project. *
* Contributors are mentioned in the code where appropriate. *
* *
* Permission to use, copy, modify and distribute this software and its *
* documentation strictly for non-commercial purposes is hereby granted *
* without fee, provided that the above copyright notice appears in all *
* copies and that both the copyright notice and this permission notice *
* appear in the supporting documentation. The authors make no claims *
* about the suitability of this software for any purpose. It is *
* provided "as is" without express or implied warranty. *
**************************************************************************/
/*
$Log$
Revision 1.3 2000/11/02 10:22:50 kowal2
Logs added
*/
///////////////////////////////////////////////////////////////////////////////
// //
// Time Projection Chamber track hits object //
//
// Origin: Marian Ivanov , GSI Darmstadt
//
// Class for storing simulated AliTPCHits for given track //
// -average compression comparing to classical ClonesArray is //
// around 5-7 (depending on the required hit precision) //
// //
//Begin_Html
/*
*/
//End_Html
// //
// //
///////////////////////////////////////////////////////////////////////////////
#include "TVector3.h"
#include "TClonesArray.h"
#include "AliTPCTrackHits.h"
#include "AliTPC.h"
#include
ClassImp(AliTPCTrackHits)
LClassImp(AliTrackHitsInfo)
LClassImp(AliTrackHitsParam)
LClassImp(AliHitInfo)
Int_t AliTrackHitsInfo::fgCounter1 =0;
Int_t AliTrackHitsInfo::fgCounter2 =0;
Int_t AliTrackHitsParam::fgCounter1 =0;
Int_t AliTrackHitsParam::fgCounter2 =0;
Int_t AliHitInfo::fgCounter1 =0;
Int_t AliHitInfo::fgCounter2 =0;
Int_t AliTPCTrackHits::fgCounter1 =0;
Int_t AliTPCTrackHits::fgCounter2 =0;
const Double_t AliTPCTrackHits::fgkPrecision=1e-6; //precision
const Double_t AliTPCTrackHits::fgkPrecision2=1e-20; //precision
/************************************************************/
// Interface classes //
#include "AliTPCTrackHitsInterfaces.h"
struct AliTPCCurrentHit {
AliTPChit fHit;
UInt_t fInfoIndex;// - current info pointer
UInt_t fParamIndex;// - current param pointer
UInt_t fStackIndex; // - current hit stack index
Double_t fR; //current Radius
Bool_t fStatus; //current status
};
struct AliTPCTempHitInfo {
enum { fkStackSize = 10000};
AliTPCTempHitInfo();
void NewParam(Double_t r, Double_t z, Double_t fi, Int_t q);
void SetHit(Double_t r, Double_t z, Double_t fi, Int_t q);
Double_t * GetPosition(Int_t index){return &fPositionStack[index*3];}
void UpdateParam(Double_t maxdelta); //recal
void Fit2(Double_t fSumY, Double_t fSumYX, Double_t fSumYX2,
Double_t fSumX, Double_t fSumX2, Double_t fSumX3,
Double_t fSumX4, Int_t n,
Double_t &a, Double_t &b, Double_t &c);
void Fit(AliTrackHitsParam * param);
Double_t fSumDr; //
Double_t fSumDr2; //
Double_t fSumDr3; //
Double_t fSumDr4; //
Double_t fSumDFi; //
Double_t fSumDFiDr; //
Double_t fSumDFiDr2;//
Double_t fSumDZ; //
Double_t fSumDZDr; //
Double_t fSumDZDr2; //
Double_t fOldR; //previos r
Double_t fPositionStack[3*fkStackSize]; //position stack
UInt_t fQStack[fkStackSize]; //Q stack
UInt_t fStackIndex; //current stack index
UInt_t fInfoIndex; //current track info index
UInt_t fParamIndex; //current track parameters index
AliTrackHitsInfo * fInfo; //current track info
AliTrackHitsParam * fParam; //current track param
};
AliTPCTempHitInfo::AliTPCTempHitInfo()
{
//
//set to default value
fSumDr=fSumDr2=fSumDr3=fSumDr4=
fSumDFi=fSumDFiDr=fSumDFiDr2=
fSumDZ=fSumDZDr=fSumDZDr2=0;
fStackIndex = 0;
fInfoIndex = 0;
fParamIndex = 0;
}
void AliTPCTempHitInfo::NewParam(Double_t r, Double_t z, Double_t fi, Int_t q)
{
//
//reset stack and sum parameters
//store line initial point
fSumDr=fSumDr2=fSumDr3=fSumDr4=
fSumDFi=fSumDFiDr=fSumDFiDr2=
fSumDZ=fSumDZDr=fSumDZDr2=0;
fStackIndex=0;
fParam->fR = r;
fOldR = r;
fParam->fZ = z;
fParam->fFi = fi;
fParam->fAn = 0.;
fParam->fAd = 0.;
fParam->fTheta =0.;
fParam->fThetaD =0.;
SetHit(r,z,fi,q);
}
void AliTPCTempHitInfo::SetHit(Double_t r, Double_t z, Double_t fi, Int_t q)
{
//
//add hit to the stack
//recalculate new estimete of line parameters
Double_t *f = GetPosition(fStackIndex);
f[0] = r;
f[1] = z;
f[2] = fi;
fQStack[fStackIndex]=q;
if (fStackIndex==0) return;
Double_t dr = (r-fParam->fR);
if (TMath::Abs(dr)fFi;
Double_t dz = z -fParam->fZ;
Double_t dr2 =dr*dr;
Double_t dr3 =dr2*dr;
Double_t dr4 =dr3*dr;
fSumDr +=dr;
fSumDr2+=dr2;
fSumDr3+=dr3;
fSumDr4+=dr4;
fSumDFi +=dfi;
fSumDFiDr+=dfi*dr;
fSumDFiDr2+=dfi*dr2;
fSumDZ +=dz;
fSumDZDr+=dz*dr;
fSumDZDr2+=dz*dr2;
//update fit parameters
//
Double_t det = fSumDr2*fSumDr4-fSumDr3*fSumDr3;
if (TMath::Abs(det)1 ) ){
fParam->fAn = (fSumDr4*fSumDFiDr-fSumDr3*fSumDFiDr2)/det;
fParam->fAd = (fSumDr2*fSumDFiDr2-fSumDr3*fSumDFiDr)/det;
}
else
fParam->fAn = fSumDFiDr/fSumDr2;
if ( ( fStackIndex>1 ) ){
fParam->fTheta = (fSumDr4*fSumDZDr-fSumDr3*fSumDZDr2)/det;
fParam->fThetaD= (fSumDr2*fSumDZDr2-fSumDr3*fSumDZDr)/det;
}
else
fParam->fTheta = fSumDZDr/fSumDr2;
}
void AliTPCTempHitInfo::UpdateParam(Double_t maxdelta)
{
//recalc parameters not fixing origin point
if (fStackIndex>5){
Double_t a,b,c;
a=b=c=0;
Fit2(fSumDFi, fSumDFiDr, fSumDFiDr2, fSumDr,fSumDr2,fSumDr3,fSumDr4,
fStackIndex, a,b,c);
if (TMath::Abs(a)fFi +=a/fParam->fR;
fParam->fAn = b;
fParam->fAd = c;
}
Fit2(fSumDZ, fSumDZDr, fSumDZDr2, fSumDr,fSumDr2,fSumDr3,fSumDr4,
fStackIndex, a,b,c) ;
if (TMath::Abs(a)fZ +=a;
fParam->fTheta = b;
fParam->fThetaD = c;
}
}
}
void AliTPCTempHitInfo::Fit2(Double_t fSumY, Double_t fSumYX, Double_t fSumYX2,
Double_t fSumX, Double_t fSumX2, Double_t fSumX3,
Double_t fSumX4, Int_t n,
Double_t &a, Double_t &b, Double_t &c)
{
//fit of second order
Double_t det =
n* (fSumX2*fSumX4-fSumX3*fSumX3) -
fSumX* (fSumX*fSumX4-fSumX3*fSumX2)+
fSumX2* (fSumX*fSumX3-fSumX2*fSumX2);
if (TMath::Abs(det)> AliTPCTrackHits::fgkPrecision) {
a =
(fSumY * (fSumX2*fSumX4-fSumX3*fSumX3)-
fSumX *(fSumYX*fSumX4-fSumYX2*fSumX3)+
fSumX2*(fSumYX*fSumX3-fSumYX2*fSumX2))/det;
b=
(n*(fSumYX*fSumX4-fSumX3*fSumYX2)-
fSumY*(fSumX*fSumX4-fSumX3*fSumX2)+
fSumX2*(fSumX*fSumYX2-fSumYX*fSumX2))/det;
c=
(n*(fSumX2*fSumYX2-fSumYX*fSumX3)-
fSumX*(fSumX*fSumYX2-fSumYX*fSumX2)+
fSumY*(fSumX*fSumX3-fSumX2*fSumX2))/det;
}
}
void AliTPCTempHitInfo::Fit(AliTrackHitsParam * param)
{
// fit fixing first and the last point
//result stored in new param
Double_t dx2 = (GetPosition(fStackIndex))[0]-fParam->fR;
Double_t det = fSumDr4+dx2*fSumDr2-2*dx2*fSumDr3;
if ( (TMath::Abs(det)> AliTPCTrackHits::fgkPrecision) &&
((TMath::Abs(dx2)> AliTPCTrackHits::fgkPrecision))){
Double_t dfi2 = (GetPosition(fStackIndex))[1]-fParam->fFi;
param->fAd = (fSumDFiDr2+dfi2*fSumDr-dx2*fSumDFiDr-dfi2*fSumDr3/dx2)/det;
param->fAn = (dfi2-param->fAd*dx2*dx2)/dx2;
Double_t dz2 = (GetPosition(fStackIndex))[1]-fParam->fZ;
param->fTheta = (fSumDZDr2+dz2*fSumDr-dx2*fSumDZDr-dz2*fSumDr3/dx2)/det;
param->fTheta = (dz2-param->fAd*dx2*dx2)/dx2;
}
}
AliTPCTrackHits::AliTPCTrackHits()
{
//
//default constructor
//
const Float_t kHitPrecision=0.002; //default precision for hit position in cm
const Float_t kStep =0.003; //30 mum step
const UShort_t kMaxDistance =100; //maximum distance 100
fPrecision=kHitPrecision; //precision in cm
fStep = kStep; //step size
fMaxDistance = kMaxDistance; //maximum distance
fTempInfo =0;
fTrackHitsInfo = new AliObjectArray("AliTrackHitsInfo");
fTrackHitsParam = new AliObjectArray("AliTrackHitsParam");
fHitsPosAndQ = new TArrayOfArrayVStack("AliHitInfo");
fCurrentHit = new AliTPCCurrentHit;
fgCounter1++;
fgCounter2++;
}
AliTPCTrackHits::~AliTPCTrackHits()
{
//
//default destructor
//
if (fTrackHitsInfo) delete fTrackHitsInfo;
if (fTrackHitsParam) delete fTrackHitsParam;
if (fHitsPosAndQ) delete fHitsPosAndQ;
if (fCurrentHit) delete fCurrentHit;
if (fTempInfo) delete fTempInfo;
fgCounter1--;
}
void AliTPCTrackHits::Clear()
{
//
//clear object
fTrackHitsInfo->Clear();
fTrackHitsParam->Clear();
//fTrackHitsInfo->Resize(0);
//fTrackHitsParam->Resize(0);
fHitsPosAndQ->Clear();
if (fTempInfo){
delete fTempInfo;
fTempInfo =0;
}
}
void AliTPCTrackHits::AddHitKartez(Int_t volumeID, Int_t trackID, Double_t x,
Double_t y, Double_t z,Int_t q)
{
Double_t r = TMath::Sqrt(x*x+y*y);
Double_t fi = TMath::ACos(x/r);
if (y<0) fi*=-1.;
AddHit(volumeID,trackID,r,z,fi,q);
}
void AliTPCTrackHits::AddHit(Int_t volumeID, Int_t trackID,
Double_t r, Double_t z, Double_t fi, Int_t q)
{
//
Bool_t diff=kFALSE;
if (!fTempInfo) { //initialsation of track
fTempInfo = new AliTPCTempHitInfo;
//
if (fTrackHitsInfo->GetCapacity()<10) fTrackHitsInfo->Reserve(10);
fTrackHitsInfo->Resize(1);
fTempInfo->fInfoIndex =0;
if (fTrackHitsParam->GetCapacity()<100) fTrackHitsParam->Reserve(100);
fTrackHitsParam->Resize(1);
//
fTempInfo->fInfo =
(AliTrackHitsInfo*) (fTrackHitsInfo->At(0));
fTempInfo->fInfo->fVolumeID = volumeID;
fTempInfo->fInfo->fTrackID = trackID;
fTempInfo->fInfo->fHitParamIndex =0;
fTempInfo->fInfoIndex = 0;
//
fTempInfo->fParam =
(AliTrackHitsParam*) (fTrackHitsParam->At(0));
fTempInfo->fParamIndex = 0;
fTempInfo->NewParam(r,z,fi,q);
return;
}
Int_t size = fHitsPosAndQ->GetSize();
if (size>(Int_t)fTempInfo->fParamIndex) {
fTempInfo->fParamIndex++;
if (fTempInfo->fParamIndex+1>fTrackHitsParam->GetSize())
fTrackHitsParam->Resize(fTempInfo->fParamIndex+1);
fTempInfo->fParam =
(AliTrackHitsParam*) (fTrackHitsParam->At(fTempInfo->fParamIndex));
fTempInfo->NewParam(r,z,fi,q);
return;
}
// if new volume or new trackID
if ( (volumeID!=fTempInfo->fInfo->fVolumeID) ||
(trackID!=fTempInfo->fInfo->fTrackID)){
diff=kTRUE;
FlushHitStack(kTRUE);
fTempInfo->fInfoIndex++;
if (fTempInfo->fInfoIndex+1>fTrackHitsInfo->GetSize())
fTrackHitsInfo->Resize(fTempInfo->fInfoIndex+1);
fTempInfo->fInfo =
(AliTrackHitsInfo*) (fTrackHitsInfo->At(fTempInfo->fInfoIndex));
fTempInfo->fInfo->fVolumeID = volumeID;
fTempInfo->fInfo->fTrackID = trackID;
fTempInfo->fInfo->fHitParamIndex =fTempInfo->fParamIndex+1;
// FlushHitStack(kTRUE);
fTempInfo->fParamIndex++;
if (fTempInfo->fParamIndex+1>fTrackHitsParam->GetSize())
fTrackHitsParam->Resize(fTempInfo->fParamIndex+1);
fTempInfo->fParam =
(AliTrackHitsParam*) (fTrackHitsParam->At(fTempInfo->fParamIndex));
fTempInfo->NewParam(r,z,fi,q);
return;
}
//calculate current fit precission to next point
AliTrackHitsParam ¶m = *(fTempInfo->fParam);
Double_t dd=0;
Double_t dl=0;
Double_t ratio=0;
Double_t dr,dz,dfi,ddz,ddfi;
Double_t drhit,ddl;
dr=dz=dfi=ddz=ddfi=0;
drhit = r-fTempInfo->fOldR;
{
//Double_t dfi2 = param.fAn+2*param.fAd*(r-param.fR);
Double_t dfi2 = param.fAn;
dfi2*=dfi2*fTempInfo->fOldR*fTempInfo->fOldR;
//Double_t ddz2 = param.fTheta+2*param.fThetaD*(r-param.fR);
Double_t ddz2 = param.fTheta;
ddz2*=ddz2;
ratio = TMath::Sqrt(1.+ dfi2+ ddz2);
}
dl = fStep * Short_t(TMath::Nint(drhit*ratio/fStep));
ddl = dl - drhit*ratio;
fTempInfo->fOldR += dl/ratio;
if (fTempInfo->fStackIndex>2){
dr = r-param.fR;
dz = z-param.fZ;
dfi = fi-param.fFi;
ddz = dr*param.fTheta+dr*dr*param.fThetaD-dz;
ddfi= dr*param.fAn+dr*dr*param.fAd-dfi;
dd = TMath::Sqrt(ddz*ddz+r*r*ddfi*ddfi+ddl*ddl);
//
}
//safety factor 1.25
if ( ( (dd*1.25>fPrecision) ) ||
(fTempInfo->fStackIndex+4>fTempInfo->fkStackSize) ||
(TMath::Abs(dl/fStep)>fMaxDistance) )
diff=kTRUE;
else{
fTempInfo->fStackIndex++;
fTempInfo->SetHit(r,z,fi,q);
return;
}
//if parameter changed
if (FlushHitStack(kFALSE)){ //if full buffer flushed
fTempInfo->fParamIndex++;
if (fTempInfo->fParamIndex+1>fTrackHitsParam->GetSize())
fTrackHitsParam->Resize(fTempInfo->fParamIndex+1);
fTempInfo->fParam =
(AliTrackHitsParam*) (fTrackHitsParam->At(fTempInfo->fParamIndex));
fTempInfo->NewParam(r,z,fi,q);
}
else{
fTempInfo->fStackIndex++;
fTempInfo->SetHit(r,z,fi,q);
}
}
Bool_t AliTPCTrackHits::FlushHitStack(Bool_t force)
{
//
//write fHitsPosAndQ information from the stack to te arrays
if (!fTempInfo) return kFALSE;
Int_t size = fHitsPosAndQ->GetSize();
if ( (size>0)&&(size!=(Int_t)fTempInfo->fParamIndex)) return kFALSE;
if (fHitsPosAndQ->Push(fTempInfo->fStackIndex+1)!=fTempInfo->fParamIndex){
cout<<"internal error - contact MI\n";
return kFALSE;
}
AliHitInfo * info;
AliTrackHitsParam & param = *(fTempInfo->fParam);
//recalculate track parameter not fixing first point
fTempInfo->UpdateParam(fStep/4.);
//fTempInfo->Fit(fTempInfo->fParam); //- fixing the first and the last point
Double_t oldr = param.fR;
//cout<<"C3"<fStackIndex<<"\n"<fStackIndex; i++){
Double_t * position = fTempInfo->GetPosition(i);
Double_t dr = position[0]-oldr;
Double_t ratio;
{
//Double_t dfi2 = param.fAn+2*param.fAd*(position[0]-param.fR);
Double_t dfi2 = param.fAn;
dfi2*=dfi2*oldr*oldr;
//Double_t ddz2 = param.fTheta+2*param.fThetaD*(position[0]-param.fR);
Double_t ddz2 = param.fTheta;
ddz2*=ddz2;
ratio = TMath::Sqrt(1.+ dfi2+ ddz2);
}
Double_t dl = fStep*(Short_t)TMath::Nint(dr*ratio/fStep);
dr = dl/ratio;
oldr+=dr;
//calculate precission
AliTrackHitsParam ¶m = *(fTempInfo->fParam);
//real deltas
Double_t dr1= position[0]-param.fR;
Double_t dz = position[1]-param.fZ;
Double_t dfi = position[2]-param.fFi;
//extrapolated deltas
Double_t dr2 = oldr-param.fR;
Double_t ddr = dr2-dr1;
Double_t ddz = dr2*param.fTheta+dr2*dr2*param.fThetaD-dz;
Double_t ddfi= dr2*param.fAn+dr2*dr2*param.fAd-dfi;
dd = TMath::Sqrt(ddz*ddz+oldr*oldr*ddfi*ddfi+ddr*ddr);
if ( (dd>fPrecision) ){
if (i==0){
param.fAn = 0;
param.fAd = 0;
param.fTheta =0;
param.fThetaD =0;
Double_t ddz = dr2*param.fTheta+dr2*dr2*param.fThetaD-dz;
Double_t ddfi= dr2*param.fAn+dr2*dr2*param.fAd-dfi;
dl = 0;
dd = TMath::Sqrt(ddz*ddz+oldr*oldr*ddfi*ddfi+ddr*ddr);
}
else
break;
}
info = (AliHitInfo*)(fHitsPosAndQ->At(fTempInfo->fParamIndex,i));
info->fHitDistance = Short_t(TMath::Nint(dl/fStep));
info->fCharge = Short_t(fTempInfo->fQStack[i]);
/*
cout<<"C2";
cout<<" "<fStackIndex<<" \t";
cout<<" "<fStackIndex){ //if previous iteration not succesfull
fHitsPosAndQ->Resize(fTempInfo->fParamIndex,i);
//
fTempInfo->fParamIndex++;
if (fTempInfo->fParamIndex+1>fTrackHitsParam->GetSize())
fTrackHitsParam->Resize(fTempInfo->fParamIndex+1);
fTempInfo->fParam =
(AliTrackHitsParam*) (fTrackHitsParam->At(fTempInfo->fParamIndex));
Double_t * p = fTempInfo->GetPosition(i);
UInt_t index2 = fTempInfo->fStackIndex;
fTempInfo->NewParam(p[0],p[1],p[2],fTempInfo->fQStack[i]);
if (i+1<=index2) FlushHitStack2(i+1,index2);
if (force) return FlushHitStack(kTRUE);
return kFALSE;
}
return kTRUE;
}
void AliTPCTrackHits::FlushHitStack2(Int_t index1, Int_t index2)
{
//
// second iteration flush stack
// call only for hits where first iteration were not succesfully interpolated
Double_t * positionstack = new Double_t[3*(index2-index1+1)];
UInt_t * qstack = new UInt_t[index2-index1+1];
memcpy(positionstack, &fTempInfo->fPositionStack[3*index1],
(3*(index2-index1+1))*sizeof(Double_t));
memcpy(qstack, &fTempInfo->fQStack[index1],(index2-index1+1)*sizeof(UInt_t));
Double_t *p = positionstack;
for (Int_t j=0; j<=index2-index1;j++){
fTempInfo->fStackIndex++;
fTempInfo->SetHit(p[3*j+0],p[3*j+1],p[3*j+2],qstack[j]);
}
delete []positionstack;
delete []qstack;
}
Bool_t AliTPCTrackHits::First()
{
//
//set Current hit for the first hit
//
AliTrackHitsInfo *info = (AliTrackHitsInfo *)fTrackHitsInfo->At(0);
AliTrackHitsParam *param = (AliTrackHitsParam *)fTrackHitsParam->At(0);
AliHitInfo * hinfo = (AliHitInfo *)fHitsPosAndQ->At(0,0);
if (!(info) || !(param) || !(hinfo) ) {
fCurrentHit->fStatus = kFALSE;
return kFALSE;
}
fCurrentHit->fInfoIndex = 0;
fCurrentHit->fParamIndex = 0;
fCurrentHit->fStackIndex = 0;
fCurrentHit->fHit.fSector = info->fVolumeID;
fCurrentHit->fHit.SetTrack(info->fTrackID);
fCurrentHit->fHit.SetX(param->fR*TMath::Cos(param->fFi));
fCurrentHit->fHit.SetY(param->fR*TMath::Sin(param->fFi));
fCurrentHit->fHit.SetZ(param->fZ);
fCurrentHit->fHit.fQ = hinfo->fCharge;
fCurrentHit->fR = param->fR;
return fCurrentHit->fStatus = kTRUE;
}
Bool_t AliTPCTrackHits::Next()
{
//
//
if (!(fCurrentHit->fStatus))
return kFALSE;
fCurrentHit->fStackIndex++;
AliHitInfo * hinfo = (AliHitInfo *)fHitsPosAndQ->At(fCurrentHit->fParamIndex,
fCurrentHit->fStackIndex);
AliTrackHitsInfo *info = (AliTrackHitsInfo *)fTrackHitsInfo->At(fCurrentHit->fInfoIndex);
AliTrackHitsParam *param = (AliTrackHitsParam *)fTrackHitsParam->At(fCurrentHit->fParamIndex);
if (!hinfo) {
hinfo = (AliHitInfo *)fHitsPosAndQ->At(fCurrentHit->fParamIndex+1, 0);
if (!hinfo)
return fCurrentHit->fStatus = kFALSE;
if (hinfo){
fCurrentHit->fParamIndex++;
fCurrentHit->fStackIndex = 0;
param = (AliTrackHitsParam *)fTrackHitsParam->At(fCurrentHit->fParamIndex);
if (!param)
return fCurrentHit->fStatus = kFALSE;
fCurrentHit->fR = param->fR;
if ((fCurrentHit->fInfoIndex+1GetSize())
&&((info+1)->fHitParamIndex<=fCurrentHit->fParamIndex)){
fCurrentHit->fInfoIndex++;
info = (AliTrackHitsInfo *)fTrackHitsInfo->At(fCurrentHit->fInfoIndex);
if (!info)
return fCurrentHit->fStatus = kFALSE;
fCurrentHit->fHit.fSector = info->fVolumeID;
fCurrentHit->fHit.SetTrack(info->fTrackID);
}
}
}
Double_t ratio;
{
// Double_t dfi2 = param->fAn+2*param->fAd*(fCurrentHit->fR-param->fR);
Double_t dfi2 = param->fAn;
dfi2*=dfi2*fCurrentHit->fR*fCurrentHit->fR;
// Double_t ddz2 = param->fTheta+2*param->fThetaD*(fCurrentHit->fR-param->fR);
Double_t ddz2 = param->fTheta;
ddz2*=ddz2;
ratio = TMath::Sqrt(1.+ dfi2+ ddz2);
}
fCurrentHit->fHit.fQ = hinfo->fCharge;
fCurrentHit->fR += fStep*hinfo->fHitDistance/ratio;
Double_t dR = fCurrentHit->fR - param->fR;
//Double_t dR =0;
Double_t fi = param->fFi + (param->fAn*dR+param->fAd*dR*dR);
Double_t z = param->fZ + (param->fTheta*dR+param->fThetaD*dR*dR);
fCurrentHit->fHit.SetX(fCurrentHit->fR*TMath::Cos(fi));
fCurrentHit->fHit.SetY(fCurrentHit->fR*TMath::Sin(fi));
fCurrentHit->fHit.SetZ(z);
return kTRUE;
}
AliTPChit * AliTPCTrackHits::GetHit()
{
//
return (fCurrentHit->fStatus)? &fCurrentHit->fHit:0;
//return &fCurrentHit->fHit;
}
AliTrackHitsParam * AliTPCTrackHits::GetParam()
{
//
return (fCurrentHit->fStatus)? (AliTrackHitsParam *)fTrackHitsParam->At(fCurrentHit->fParamIndex) :0;
}
AliHitInfo * AliTPCTrackHits::GetHitInfo()
{
//
return (fCurrentHit->fStatus)?
(AliHitInfo *)fHitsPosAndQ->At(fCurrentHit->fParamIndex,fCurrentHit->fStackIndex) :0;
}