/**************************************************************************
* 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. *
**************************************************************************/
/* $Id$ */
///////////////////////////////////////////////////////////////////////////////
// //
// Time Projection Chamber track hits object //
//
// Origin: Marian Ivanov , GSI Darmstadt
//
// AliTPCTrackHitsV2
// Container for Track Hits - based on standard TClonesArray -
// fArray of AliTPCTrackHitsParamV2
// In AliTPCTrackHitsParamV2 - parameterization of the track segment is stored
// for each of the track segment - relative position ( distance between hits) and
// charge of the hits is stored - comparing to classical TClonesArray of AliTPChit -
// comperssion factor of 5-7 (depending on the required precision) -
// In future release AliTPCTrackHitsV2 - will replace old AliTPCTrackHits - which were not
// based on standard ROOT containers
// Basic function:
// // during building Container
// AddHitKartez(Int_t volumeID, Int_t trackID, Double_t x, Double_t y, Double_t z,Int_t q)
// void SetHitPrecision(Double_t prec) {fPrecision=prec;}
// void SetStepPrecision(Double_t prec) {fStep=prec;}
// Bool_t FlushHitStack(Bool_t force=kTRUE);
// //at the end necessary to have Container in consistent state
//
// // looping over Container
// Bool_t First(), Bool_t Next() - iterators - return status of the operation
// AliTPChit * GetHit(); - return current hit
//Begin_Html
/*
*/
//End_Html
// //
// //
///////////////////////////////////////////////////////////////////////////////
//
#include "AliTPCTrackHitsV2.h"
#include "TClonesArray.h"
#include "AliTPC.h"
ClassImp(AliTPCTrackHitsV2)
ClassImp(AliTrackHitsParamV2)
//
Int_t AliTrackHitsParamV2::fgCounter1 =0;
Int_t AliTrackHitsParamV2::fgCounter2 =0;
//
Int_t AliTPCTrackHitsV2::fgCounter1 =0;
Int_t AliTPCTrackHitsV2::fgCounter2 =0;
//
const Double_t AliTPCTrackHitsV2::fgkPrecision=1e-6; //precision
const Double_t AliTPCTrackHitsV2::fgkPrecision2=1e-20; //precision
const Double_t AliTPCTrackHitsV2::fgkTimePrecision=20.e-9; //hit time precision
struct AliTPCTempHitInfoV2 {
friend class AliTPCTrackHitsV2;
protected:
enum { kStackSize = 10000};
AliTPCTempHitInfoV2();
AliTPCTempHitInfoV2(const AliTPCTempHitInfoV2 &hit)
{hit.Copy(*this);}
AliTPCTempHitInfoV2& operator = (const AliTPCTempHitInfoV2 &hit)
{hit.Copy(*this); return (*this);}
void NewParam(Double_t r, Double_t z, Double_t fi, Int_t q, Float_t time);
void SetHit(Double_t r, Double_t z, Double_t fi, Int_t q, Float_t time);
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(AliTrackHitsParamV2 * param);
Double_t fSumDr; // Sum of Dr
Double_t fSumDr2; // Square of sum of Dr
Double_t fSumDr3; // Cube of sum of Dr
Double_t fSumDr4; // Fourth power of sum of Dr
Double_t fSumDFi; // Sum of DFi
Double_t fSumDFiDr; // Sum of DFiDr
Double_t fSumDFiDr2;// Sum of square of DFiDr
Double_t fSumDZ; // Sum of DZ
Double_t fSumDZDr; // Sum of DZDr
Double_t fSumDZDr2; // Sum of square of DZDr
Double_t fOldR; //previos r
Double_t fPositionStack[3*kStackSize]; //position stack
UInt_t fQStack[kStackSize]; //Q stack
Float_t fTimeStack[kStackSize]; //time 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
AliTrackHitsParamV2 * fParam; //current track param
private:
void Copy(AliTPCTempHitInfoV2 &) const
{printf("Not Implemented\n"); exit(1);}
};
AliTPCTempHitInfoV2::AliTPCTempHitInfoV2()
{
//
// Standard constructor
// set to default value
//
fSumDr=fSumDr2=fSumDr3=fSumDr4=
fSumDFi=fSumDFiDr=fSumDFiDr2=
fSumDZ=fSumDZDr=fSumDZDr2=0;
fStackIndex = 0;
// fInfoIndex = 0;
fParamIndex = 0;
}
void AliTPCTempHitInfoV2::NewParam(Double_t r, Double_t z, Double_t fi, Int_t q, Float_t time)
{
//
//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,time);
}
void AliTPCTempHitInfoV2::SetHit(Double_t r, Double_t z, Double_t fi, Int_t q, Float_t time)
{
//
//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;
fTimeStack[fStackIndex]=time;
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 AliTPCTempHitInfoV2::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 AliTPCTempHitInfoV2::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)> AliTPCTrackHitsV2::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 AliTPCTempHitInfoV2::Fit(AliTrackHitsParamV2 * 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)> AliTPCTrackHitsV2::fgkPrecision) &&
((TMath::Abs(dx2)> AliTPCTrackHitsV2::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;
}
}
AliTrackHitsParamV2::AliTrackHitsParamV2()
{
//
// default constructor
//
fgCounter1++;
fgCounter2++;
fHitDistance=0;
fCharge=0;
fTime=0;
fNHits=0;
}
AliTrackHitsParamV2::~AliTrackHitsParamV2()
{
//
// Standard destructor
//
fgCounter1--;
if (fHitDistance) {
delete[]fHitDistance;
fHitDistance=0;
}
if (fCharge){
delete[]fCharge;
fCharge =0;
}
if (fTime){
delete[]fTime;
fTime =0;
}
}
AliTPCTrackHitsV2::AliTPCTrackHitsV2()
{
//
//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;
fSize=0;
//fTrackHitsInfo = new AliObjectArray("AliTrackHitsInfo");
//fTrackHitsParam = new AliObjectArray("AliTrackHitsParamV2");
//fHitsPosAndQ = new TArrayOfArrayVStack("AliHitInfo");
fArray = new TClonesArray("AliTrackHitsParamV2");
fCurrentHit = new AliTPCCurrentHitV2;
fVolumes =0;
fNVolumes =0;
fHit =0;
fgCounter1++;
fgCounter2++;
}
AliTPCTrackHitsV2::~AliTPCTrackHitsV2()
{
//
//default destructor
//
// if (fTrackHitsInfo) delete fTrackHitsInfo;
if (fArray) {
delete fArray;
fArray =0;
}
//if (fHitsPosAndQ) delete fHitsPosAndQ;
if (fCurrentHit) delete fCurrentHit;
if (fTempInfo) delete fTempInfo;
if (fVolumes) {
delete [] fVolumes;
fVolumes =0;
fNVolumes=0;
}
if (fHit){
delete fHit;
fHit=0;
}
fgCounter1--;
}
void AliTPCTrackHitsV2::Clear(Option_t * /*option*/)
{
//
// clear object
//
fSize = 0;
if (fArray){
for (Int_t i=0;iGetEntriesFast();i++){
AliTrackHitsParamV2 * par = (AliTrackHitsParamV2 *)fArray->UncheckedAt(i);
par->~AliTrackHitsParamV2(); // delete object
}
fArray->Clear();
}
if (fTempInfo){
delete fTempInfo;
delete fHit;
fHit =0;
fTempInfo =0;
}
if (fVolumes){
delete [] fVolumes;
fVolumes=0;
fNVolumes=0;
}
}
void AliTPCTrackHitsV2::AddHitKartez(Int_t volumeID, Int_t trackID, Double_t x,
Double_t y, Double_t z,Int_t q, Float_t time)
{
//
// add hit to the container - it add hit at the end - input in global coordinata
//
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,time);
}
void AliTPCTrackHitsV2::AddHit(Int_t volumeID, Int_t trackID,
Double_t r, Double_t z, Double_t fi, Int_t q, Float_t time)
{
//
// Adding one hit
//
fSize++;
Bool_t diff=kFALSE;
if (!fTempInfo) { //initialisation of track - initialisation of parameters
fTempInfo = new AliTPCTempHitInfoV2;
fTempInfo->fParam = new((*fArray)[0]) AliTrackHitsParamV2;
fTempInfo->fParam->fVolumeID = volumeID;
fTempInfo->fParam->fTrackID = trackID;
AddVolume(volumeID);
//
fTempInfo->fParamIndex = 0;
fTempInfo->NewParam(r,z,fi,q,time);
return;
}
// if new volume or new trackID
if ( (volumeID!=fTempInfo->fParam->fVolumeID) ||
(trackID!=fTempInfo->fParam->fTrackID)){
if (volumeID!=fTempInfo->fParam->fVolumeID) AddVolume(volumeID);
diff=kTRUE;
FlushHitStack(kTRUE);
fTempInfo->fParamIndex++;
fTempInfo->fParam = new((*fArray)[fTempInfo->fParamIndex]) AliTrackHitsParamV2;
fTempInfo->fParam->fVolumeID = volumeID;
fTempInfo->fParam->fTrackID = trackID;
fTempInfo->NewParam(r,z,fi,q,time);
return;
}
//calculate current fit precission to next point
AliTrackHitsParamV2 ¶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)); // MI change - range check
dl = drhit*ratio/fStep;
if (TMath::Abs(dl)>32765) dl =0;
dl = fStep * Short_t(TMath::Nint(dl));
//
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->kStackSize) ||
(TMath::Abs(dl/fStep)>fMaxDistance) )
diff=kTRUE;
else{ // if precision OK
fTempInfo->fStackIndex++;
fTempInfo->SetHit(r,z,fi,q,time);
return;
}
//if parameter changed
if (FlushHitStack(kFALSE)){ //if full buffer flushed
fTempInfo->fParamIndex++;
fTempInfo->fParam = new((*fArray)[fTempInfo->fParamIndex]) AliTrackHitsParamV2;
fTempInfo->fParam->fVolumeID = volumeID;
fTempInfo->fParam->fTrackID = trackID;
fTempInfo->NewParam(r,z,fi,q,time);
}
else{
fTempInfo->fStackIndex++;
fTempInfo->SetHit(r,z,fi,q,time);
}
}
Bool_t AliTPCTrackHitsV2::FlushHitStack(Bool_t force)
{
//
// write fHitsPosAndQ information from the stack to te arrays
//
if (!fTempInfo) return kFALSE;
AliTrackHitsParamV2 & 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;
UInt_t i;
Double_t dd;
param.fNHits = fTempInfo->fStackIndex+1;
if (param.fHitDistance) delete []param.fHitDistance;
if (param.fCharge) delete []param.fCharge;
if (param.fTime) delete []param.fTime;
param.fHitDistance = new Short_t[param.fNHits];
param.fCharge = new Short_t[param.fNHits];
param.fTime = new Short_t[param.fNHits];
for (i=0; i <= fTempInfo->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); //MI change
Double_t dl = dr*ratio/fStep;
if (TMath::Abs(dl)>32765) dl =0;
dl = fStep * Short_t(TMath::Nint(dl));
dr = dl/ratio;
oldr+=dr;
//calculate precission
AliTrackHitsParamV2 ¶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 ( (dd<0) ){
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;
}
param.fHitDistance[i]= Short_t(TMath::Nint(dl/fStep));
param.fCharge[i]= Short_t(fTempInfo->fQStack[i]);
param.fTime[i]= Short_t(fTempInfo->fTimeStack[i]/AliTPCTrackHitsV2::fgkTimePrecision);
}
if (i<=fTempInfo->fStackIndex){ //if previous iteration not succesfull
Short_t * charge = new Short_t[i];
Short_t * time = new Short_t[i];
Short_t * hitDistance= new Short_t[i];
memcpy(charge, param.fCharge,sizeof(Short_t)*i);
memcpy(time, param.fTime,sizeof(Short_t)*i);
memcpy(hitDistance, param.fHitDistance,sizeof(Short_t)*i);
delete [] param.fCharge;
delete [] param.fTime;
delete [] param.fHitDistance;
param.fNHits= i;
param.fCharge = charge;
param.fTime = time;
param.fHitDistance = hitDistance;
//
Int_t volumeID = fTempInfo->fParam->fVolumeID;
Int_t trackID =fTempInfo->fParam->fTrackID;
fTempInfo->fParamIndex++;
fTempInfo->fParam = new((*fArray)[fTempInfo->fParamIndex]) AliTrackHitsParamV2;
Double_t * p = fTempInfo->GetPosition(i);
UInt_t index2 = fTempInfo->fStackIndex;
fTempInfo->NewParam(p[0],p[1],p[2],fTempInfo->fQStack[i],fTempInfo->fTimeStack[i]);
fTempInfo->fParam->fVolumeID= volumeID;
fTempInfo->fParam->fTrackID= trackID;
if (i+1<=index2) FlushHitStack2(i+1,index2);
if (force) return FlushHitStack(kTRUE);
return kFALSE;
}
return kTRUE;
}
void AliTPCTrackHitsV2::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];
Float_t * timestack = new Float_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));
memcpy(timestack, &fTempInfo->fTimeStack[index1],(index2-index1+1)*sizeof(Float_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],timestack[j]);
}
delete []positionstack;
delete []qstack;
delete []timestack;
}
void AliTPCTrackHitsV2::AddVolume(Int_t volume)
{
//
//add volumes to tthe list of volumes
//
Int_t * volumes = new Int_t[fNVolumes+1];
if (fVolumes) memcpy(volumes,fVolumes,(fNVolumes)*sizeof(Int_t));
volumes[fNVolumes]=volume;
fNVolumes++;
if (fVolumes) delete []fVolumes;
fVolumes = volumes;
}
Bool_t AliTPCTrackHitsV2::First()
{
//
//set Current hit for the first hit
//
if (fArray->GetSize()<=0) {
fCurrentHit->fStatus = kFALSE;
return kFALSE;
}
AliTrackHitsParamV2 *param = (AliTrackHitsParamV2 *)fArray->At(0);
if (!fHit) fHit = new AliTPChit;
if (!(param) ) {
fCurrentHit->fStatus = kFALSE;
return kFALSE;
}
//
fCurrentHit->fParamIndex = 0;
fCurrentHit->fStackIndex = 0;
//
//
((AliTPChit*)fHit)->fSector = param->fVolumeID;
((AliTPChit*)fHit)->SetTrack(param->fTrackID);
((AliTPChit*)fHit)->SetX(param->fR*TMath::Cos(param->fFi));
((AliTPChit*)fHit)->SetY(param->fR*TMath::Sin(param->fFi));
((AliTPChit*)fHit)->SetZ(param->fZ);
((AliTPChit*)fHit)->fQ = param->fCharge[0];
((AliTPChit*)fHit)->fTime = (Float_t)(param->fTime[0]*AliTPCTrackHitsV2::fgkTimePrecision);
/*
fCurrentHit->fHit.fSector = param->fVolumeID;
fCurrentHit->fHit.SetTrack(param->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 = param->fCharge[0];
fCurrentHit->fHit.fTime = (Float_t)(param->fTime[0]*AliTPCTrackHitsV2::fgkTimePrecision);
*/
fCurrentHit->fR = param->fR;
return fCurrentHit->fStatus = kTRUE;
}
Bool_t AliTPCTrackHitsV2::Next()
{
//
// Hit iterator
//
if (!(fCurrentHit->fStatus))
return kFALSE;
fCurrentHit->fStackIndex++;
AliTrackHitsParamV2 *param = (AliTrackHitsParamV2 *)fArray->At(fCurrentHit->fParamIndex);
if (fCurrentHit->fStackIndex>=param->fNHits){
fCurrentHit->fParamIndex++;
if (fCurrentHit->fParamIndex>=fArray->GetEntriesFast()){
fCurrentHit->fStatus=kFALSE;
return kFALSE;
}
param = (AliTrackHitsParamV2 *)fArray->At(fCurrentHit->fParamIndex);
fCurrentHit->fStackIndex=0;
fCurrentHit->fR = param->fR;
}
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->fR += fStep*param->fHitDistance[fCurrentHit->fStackIndex]/ratio;
Double_t dR = fCurrentHit->fR - param->fR;
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.fQ = param->fCharge[fCurrentHit->fStackIndex];
fCurrentHit->fHit.fTime = (Float_t)(param->fTime[fCurrentHit->fStackIndex]*AliTPCTrackHitsV2::fgkTimePrecision);
fCurrentHit->fHit.SetX(fCurrentHit->fR*TMath::Cos(fi));
fCurrentHit->fHit.SetY(fCurrentHit->fR*TMath::Sin(fi));
fCurrentHit->fHit.SetZ(z);
fCurrentHit->fHit.fSector = param->fVolumeID;
fCurrentHit->fHit.SetTrack(param->fTrackID);
*/
((AliTPChit*)fHit)->fQ = param->fCharge[fCurrentHit->fStackIndex];
((AliTPChit*)fHit)->fTime = (Float_t)(param->fTime[fCurrentHit->fStackIndex]*AliTPCTrackHitsV2::fgkTimePrecision);
((AliTPChit*)fHit)->SetX(fCurrentHit->fR*TMath::Cos(fi));
((AliTPChit*)fHit)->SetY(fCurrentHit->fR*TMath::Sin(fi));
((AliTPChit*)fHit)->SetZ(z);
((AliTPChit*)fHit)->fSector = param->fVolumeID;
((AliTPChit*)fHit)->SetTrack(param->fTrackID);
return kTRUE;
}
AliHit * AliTPCTrackHitsV2::GetHit() const
{
//
// Return one hit
//
return (fCurrentHit->fStatus)? fHit:0;
//return &fCurrentHit->fHit;
}
AliTrackHitsParamV2 * AliTPCTrackHitsV2::GetParam()
{
//
// Return current parameters
//
return (fCurrentHit->fStatus)?
(AliTrackHitsParamV2 *)fArray->At(fCurrentHit->fParamIndex):0;
}