[u/mrichter/AliRoot.git] / HBTAN / AliHBTTrackPoints.cxx

#include "AliHBTTrackPoints.h"
//_________________________________
////////////////////////////////////////////////////////////
//                                                        //
// class AliHBTTrackPoints                                //
//                                                        //
// used by Anti-Merging cut                               //
// contains set of poits the lay on track trajectory      //
// according to reconstructed track parameters -          //
// NOT CLUSTERS POSITIONS!!!                              //
// Anti-Merging cut is applied only on tracks coming from //
// different events (that are use to fill deniminators)   //
//                                                        //
////////////////////////////////////////////////////////////
#include "AliTrackReference.h"

#include "AliTPCtrack.h"
#include "AliESDtrack.h"

#include <TMath.h>
#include <TClonesArray.h>

ClassImp(AliHBTTrackPoints)

Int_t AliHBTTrackPoints::fgDebug = 0;
AliHBTTrackPoints::AliHBTTrackPoints():
 fN(0),
 fX(0x0),
 fY(0x0),
 fZ(0x0)
{
  //constructor
}
AliHBTTrackPoints::AliHBTTrackPoints(const AliHBTTrackPoints& in):
 TObject(in),
 fN(in.fN),
 fX(new Float_t[fN]),
 fY(new Float_t[fN]),
 fZ(new Float_t[fN])
{
//cpy constructor
  for (Int_t i = 0; i < fN; i++)
   {
     fX[i] = in.fX[i];
     fY[i] = in.fY[i];
     fZ[i] = in.fZ[i];
   }
}
/***************************************************************/

AliHBTTrackPoints& AliHBTTrackPoints::operator=(const AliHBTTrackPoints& in)
{
  //Assigment operator
  if(this == &in) return *this;
  TObject::operator=((const TObject&)in);
  
  if (in.fN <= 0)
   {
    delete [] fX;
    delete [] fY;
    delete [] fZ;
    fN = 0;
    fX = 0x0;
    fY = 0x0;
    fZ = 0x0;
    return *this;
   }
   
  if ( fN != in.fN )
   {
    delete [] fX;
    delete [] fY;
    delete [] fZ;
    fN = in.fN;
    fX = new Float_t[fN];
    fY = new Float_t[fN];
    fZ = new Float_t[fN];
   }

  for (Int_t i = 0; i < fN; i++)
   {
     fX[i] = in.fX[i];
     fY[i] = in.fY[i];
     fZ[i] = in.fZ[i];
   }

  return *this;
}
/***************************************************************/

AliHBTTrackPoints::AliHBTTrackPoints(Int_t n, AliESDtrack* track, Float_t mf, Float_t dr, Float_t r0):
 fN(n),
 fX(new Float_t[fN]),
 fY(new Float_t[fN]),
 fZ(new Float_t[fN])
{
  //constructor
  //mf - magnetic field in kG - needed to calculated curvature out of Pt
  //r0 - starting radius
  //dr - calculate points every dr cm, default every 30cm
  if (track == 0x0)
   {
     Error("AliHBTTrackPoints","ESD track is null");
     fN = 0;
     delete [] fX;
     delete [] fY;
     delete [] fZ;
     fX = fY = fZ = 0x0;
     return;
   }

  Double_t x;
  Double_t par[5];
  track->GetInnerExternalParameters(x,par);     //get properties of the track
  if (x == 0)
   {
     Error("AliHBTTrackPoints","This ESD track does not contain TPC information");
     return;
   }

  if (mf == 0.0)
   {
     Error("AliHBTTrackPoints","Zero Magnetic field passed as parameter.");
     return;
   }
   
  Double_t alpha = track->GetInnerAlpha();
  Double_t cc = 1000./0.299792458/mf;//conversion constant
  Double_t c=par[4]/cc;
  
  MakePoints(dr,r0,x,par,c,alpha);
  
}
/***************************************************************/

AliHBTTrackPoints::AliHBTTrackPoints(Int_t n, AliTPCtrack* track, Float_t dr, Float_t r0):
 fN(n),
 fX(new Float_t[fN]),
 fY(new Float_t[fN]),
 fZ(new Float_t[fN])
{
  //constructor
  //r0 starting radius
  //dr - calculate points every dr cm, default every 30cm
  if (track == 0x0)
   {
     Error("AliHBTTrackPoints","TPC track is null");
     fN = 0;
     delete [] fX;
     delete [] fY;
     delete [] fZ;
     fX = fY = fZ = 0x0;
     return;
   }
  track->PropagateTo(r0);

 //* This formation is now fixed in the following way:                         *
 //*      external param0:   local Y-coordinate of a track (cm)                *
 //*      external param1:   local Z-coordinate of a track (cm)                *
 //*      external param2:   local sine of the track momentum azimuth angle    *
 //*      external param3:   tangent of the track momentum dip angle           *
 //*      external param4:   1/pt (1/(GeV/c))                                  *
    
  Double_t x = 0;
  Double_t par[5];
  track->GetExternalParameters(x,par);     //get properties of the track
  
  Double_t alpha = track->GetAlpha();
  Double_t c=track->GetC();
  MakePoints(dr,r0,x,par,c,alpha);
}  

void AliHBTTrackPoints::MakePoints( Float_t dr, Float_t r0, Double_t x, Double_t* par, Double_t c, Double_t alpha)
{
  //Calculates points starting at radius r0
  //spacing every dr (in radial direction)
  // according to track parameters
  // x - position in sector local reference frame. x i parallel to R and sector is symmetric with respect to x
  // par - track external parameters; array with 5 elements;  look at AliTPCtrack.h or AliESDtrack.h for their meaning
  // c - track curvature
  // alpha - sector's rotation angle (phi) == angle needed for local to global transformation
  
  Double_t y = par[0];
  Double_t z0 = par[1];
      
  Double_t phi0local = TMath::ATan2(y,x);
  Double_t phi0global = phi0local + alpha;
  
  if (phi0local<0) phi0local+=2*TMath::Pi();
  if (phi0local>=2.*TMath::Pi()) phi0local-=2*TMath::Pi();
  
  if (phi0global<0) phi0global+=2*TMath::Pi();
  if (phi0global>=2.*TMath::Pi()) phi0global-=2*TMath::Pi();
  
  Double_t r = TMath::Hypot(x,y);
  

  if (GetDebug() > 9) 
    Info("AliHBTTrackPoints","Radius0 %f, Real Radius %f",r0,r); 
  
  if (GetDebug() > 5) 
    Info("AliHBTTrackPoints","Phi Global at first padraw %f, Phi locat %f",phi0global,phi0local);
    
  Double_t eta = x*c - par[2] ;//par[2] = fX*C - eta; eta==fP2 ; C==fP4
  
  //this calculattions are assuming new (current) model 
  Double_t tmp = par[2];
  tmp = 1. - tmp*tmp;
  tmp = c*y + TMath::Sqrt(tmp);
  Double_t dca=(TMath::Hypot(eta,tmp) - 1. )/TMath::Abs(c);

  //Here is old model Cold=Cnew/2.
  Double_t dcasq = dca*dca;
  Double_t c2 = c/2.;
  Double_t cst1 = (1.+c2*dca)*dca;//first constant
  Double_t cst2 = 1. + 2.*c2*dca;//second constant
      
  Double_t factorPhi0 = TMath::ASin((c2*r + cst1/r)/cst2);
  Double_t factorZ0 = TMath::ASin(c2*TMath::Sqrt((r*r-dcasq)/cst2))*par[3]/c2;
 
  for(Int_t i = 0; i<fN; i++)
   {
     Double_t rc = r0 + i*dr;
     Double_t factorPhi = TMath::ASin( (c2*rc + cst1/rc)/cst2 );//factor phi od rc
     Double_t phi = phi0global + factorPhi - factorPhi0;
     
     Double_t factorZ = TMath::ASin(c2*TMath::Sqrt((rc*rc-dcasq)/cst2))*par[3]/c2;
     fZ[i] = z0 + factorZ - factorZ0;
     fX[i] = rc*TMath::Cos(phi);
     fY[i] = rc*TMath::Sin(phi);
     
     if ( GetDebug() > 2 )
      {
        Info("AliHBTTrackPoints","X %f Y %f Z %f R asked %f R obtained %f",
             fX[i],fY[i],fZ[i],rc,TMath::Hypot(fX[i],fY[i]));
      }
   }
}
/***************************************************************/

AliHBTTrackPoints::~AliHBTTrackPoints()
{
  //destructor
  delete [] fX;
  delete [] fY;
  delete [] fZ;
}
/***************************************************************/

void AliHBTTrackPoints::PositionAt(Int_t n, Float_t &x,Float_t &y,Float_t &z)
{
  //returns position at point n
  if ((n<0) || (n>fN))
   {
     Error("PositionAt","Point %d out of range",n);
     return;
   }
  
  x = fX[n];
  y = fY[n];
  z = fZ[n];
  if ( GetDebug() > 1 )
    {
      Info("AliHBTTrackPoints","n %d; X %f; Y %f; Z %f",n,x,y,z);
    }
}
/***************************************************************/

Double_t AliHBTTrackPoints::AvarageDistance(const AliHBTTrackPoints& tr)
{
  //returns the aritmethic avarage distance between two tracks
  if (fN != tr.fN)
   {
     Error("AvarageDistance","Number of points is not equal");
     return -1;
   }
  if ( (fN <= 0) || (tr.fN <=0) )
   {
     Error("AvarageDistance","One of tracks is empty");
     return -1;
   }
   
  Double_t sum = 0;
  for (Int_t i = 0; i<fN; i++)
   {
     if (GetDebug()>9)
      {
//       Float_t r1sq = fX[i]*fX[i]+fY[i]*fY[i];
//       Float_t r2sq = tr.fX[i]*tr.fX[i]+tr.fY[i]*tr.fY[i];
       Float_t r1sq = TMath::Hypot(fX[i],fY[i]);
       Float_t r2sq = TMath::Hypot(tr.fX[i],tr.fY[i]);
       Info("AvarageDistance","radii: %f %f",r1sq,r2sq);
      } 

      
     Double_t dx = fX[i]-tr.fX[i];
     Double_t dy = fY[i]-tr.fY[i];
     Double_t dz = fZ[i]-tr.fZ[i];
     sum+=TMath::Sqrt(dx*dx + dy*dy + dz*dz);
     
     if (GetDebug()>0)
      {
       Info("AvarageDistance","Diff: x ,y z: %f , %f, %f",dx,dy,dz);
       Info("AvarageDistance","xxyyzz %f %f %f %f %f %f",
            fX[i],tr.fX[i],fY[i],tr.fY[i],fZ[i],tr.fZ[i]);
      } 
   }
   
  Double_t retval = sum/((Double_t)fN);
  if ( GetDebug() )
    {
      Info("AvarageDistance","Avarage distance is %f.",retval);
    }
  return retval;
}
/***************************************************************/
/***************************************************************/
/***************************************************************/
/***************************************************************/
/***************************************************************/
/***************************************************************/

/*
#include "AliRun.h"
#include "AliESD.h"
#include "AliRunLoader.h"
#include "AliTPCtrack.h"
#include "TTree.h"
#include "TBranch.h"
#include "TH2D.h"
#include "TCanvas.h"
#include "AliMagF.h"


void AliHBTTrackPoints::testesd(Int_t entr,const char* fname )
{
//testing routine
  delete gAlice;
  gAlice = 0x0;
  AliRunLoader* rl = AliRunLoader::Open();
  rl->LoadgAlice();
  
  Float_t mf = rl->GetAliRun()->Field()->SolenoidField();
 
  
  TFile* fFile = TFile::Open(fname);
  
  if (fFile == 0x0)
   {
     printf("testesd: There is no suche a ESD file\n");
     return;
   }
  AliESD* esd = dynamic_cast<AliESD*>(fFile->Get("0"));
  AliESDtrack *t = esd->GetTrack(entr);
  if (t == 0x0)
   {
     ::Error("testesd","Can not get track %d",entr);
     return;
   }

  
  Int_t N = 170;
  AliHBTTrackPoints* tp = new AliHBTTrackPoints(N,t,mf,1.);
  
  Float_t xmin = -250;
  Float_t xmax =  250;
  
  Float_t ymin = -250;
  Float_t ymax =  250;

  Float_t zmin = -250;
  Float_t zmax =  250;
  
  TH2D* hxy = new TH2D("hxy","hxy",1000,xmin,xmax,1000,ymin,ymax);
  TH2D* hxyt = new TH2D("hxyt","hxyt",1000,xmin,xmax,1000,ymin,ymax);
  TH2D* hxyTR = new TH2D("hxyTR","hxyTR",1000,xmin,xmax,1000,ymin,ymax);

  TH2D* hxz = new TH2D("hxz","hxz",1000,xmin,xmax,1000,zmin,zmax);
  TH2D* hxzt = new TH2D("hxzt","hxzt",1000,xmin,xmax,1000,zmin,zmax);
  TH2D* hxzTR = new TH2D("hxzTR","hxzTR",1000,xmin,xmax,1000,zmin,zmax);

  hxyt->SetDirectory(0x0);   
  hxy->SetDirectory(0x0);   
  hxyTR->SetDirectory(0x0);   
  
  hxzt->SetDirectory(0x0);   
  hxz->SetDirectory(0x0);   
  hxzTR->SetDirectory(0x0);   

  Float_t x,y,z;
   
  for (Int_t i = 0;i<N;i++)
   {  
      Double_t r = 84.1+i;
      tp->PositionAt(i,x,y,z);
      hxy->Fill(x,y);
      hxz->Fill(x,z);
      printf("Rdemanded %f\n",r);
      printf("tpx %f tpy %f tpz %f Rt =%f\n", x,y,z,TMath::Hypot(x,y));
      
   }

  rl->LoadTrackRefs();
  TTree* treeTR = rl->TreeTR();
  TBranch* b = treeTR->GetBranch("TPC");
  
  TClonesArray* trackrefs = new TClonesArray("AliTrackReference", 100);
  AliTrackReference* tref;
  b->SetAddress(&trackrefs);
  
  Int_t tlab = TMath::Abs(t->GetLabel());

  Int_t netr = (Int_t)treeTR->GetEntries();
  printf("Found %d entries in TR tree\n",netr);
  
  for (Int_t e = 0; e < netr; e++)
   { 
     treeTR->GetEntry(e);
     tref = (AliTrackReference*)trackrefs->At(0);
     if (tref == 0x0) continue;
     if (tref->GetTrack() != tlab) continue;
    
     printf("Found %d entries in TR array\n",trackrefs->GetEntries());
     
     for (Int_t i = 0; i < trackrefs->GetEntries(); i++)
      {
        tref = (AliTrackReference*)trackrefs->At(i);
        if (tref->GetTrack() != tlab) continue;
        x = tref->X();
        y = tref->Y();
        z = tref->Z();
        printf("Track Ref: x %f y %f z %f\n",tref->X(),tref->Y(),tref->Z());

        hxzTR->Fill(x,z);
        hxyTR->Fill(x,y);
        for (Int_t j = 1; j < 10; j++)
         {
            hxyTR->Fill(x, y+j*0.1);
            hxyTR->Fill(x, y-j*0.1);
            hxyTR->Fill(x+j*0.1,y);
            hxyTR->Fill(x-j*0.1,y);

            hxzTR->Fill(x,z-j*0.1);
            hxzTR->Fill(x,z+j*0.1);
            hxzTR->Fill(x-j*0.1,z);
            hxzTR->Fill(x+j*0.1,z);
         }
      }
      break; 
    }  
  hxy->Draw("");
//  hxzt->Draw("same");
  hxyTR->Draw("same");
  
  delete rl;
}

/***************************************************************/
/***************************************************************/
/***************************************************************/
/*
void AliHBTTrackPoints::testtpc(Int_t entr)
{
//testing routine

  delete gAlice;
  gAlice = 0x0;
  AliRunLoader* rl = AliRunLoader::Open();
  AliLoader* l = rl->GetLoader("TPCLoader");
  rl->LoadgAlice();
  AliKalmanTrack::SetConvConst(100/0.299792458/0.2/rl->GetAliRun()->Field()->Factor());
  l->LoadTracks();
  AliTPCtrack* t = new AliTPCtrack();
  TBranch* b=l->TreeT()->GetBranch("tracks");
  b->SetAddress(&t);
  l->TreeT()->GetEntry(entr);  
  Int_t N = 160;
  AliHBTTrackPoints* tp = new AliHBTTrackPoints(N,t,1.);
  
  Float_t xmin = -250;
  Float_t xmax =  250;
  
  Float_t ymin = -250;
  Float_t ymax =  250;

  Float_t zmin = -250;
  Float_t zmax =  250;
  
  TH2D* hxy = new TH2D("hxy","hxy",1000,xmin,xmax,1000,ymin,ymax);
  TH2D* hxyt = new TH2D("hxyt","hxyt",1000,xmin,xmax,1000,ymin,ymax);
  TH2D* hxyTR = new TH2D("hxyTR","hxyTR",1000,xmin,xmax,1000,ymin,ymax);

  TH2D* hxz = new TH2D("hxz","hxz",1000,xmin,xmax,1000,zmin,zmax);
  TH2D* hxzt = new TH2D("hxzt","hxzt",1000,xmin,xmax,1000,zmin,zmax);
  TH2D* hxzTR = new TH2D("hxzTR","hxzTR",1000,xmin,xmax,1000,zmin,zmax);

  hxyt->SetDirectory(0x0);   
  hxy->SetDirectory(0x0);   
  hxyTR->SetDirectory(0x0);   
  
  hxzt->SetDirectory(0x0);   
  hxz->SetDirectory(0x0);   
  hxzTR->SetDirectory(0x0);   

  Float_t x,y,z;
   
  for (Int_t i = 0;i<N;i++)
   {  
      Double_t r = 84.1+i;
      tp->PositionAt(i,x,y,z);
      hxy->Fill(x,y);
      hxz->Fill(x,z);
      printf("Rdemanded %f\n",r);
      printf("tpx %f tpy %f tpz %f Rt =%f\n", x,y,z,TMath::Hypot(x,y));
      
      //BUT they are local!!!!
      t->PropagateTo(r);
//      Double_t phi = t->Phi();
      Double_t rl = TMath::Hypot(t->GetX(),t->GetY());//real radius 
      
      Double_t alpha = t->GetAlpha();
      Double_t salpha = TMath::Sin(alpha);
      Double_t calpha = TMath::Cos(alpha);
      x = t->GetX()*calpha - t->GetY()*salpha;
      y = t->GetX()*salpha + t->GetY()*calpha;
      z = t->GetZ();
      
      printf("tx %f ty %f tz %f Rt = %f R from XY %f\n",x,y,z,TMath::Hypot(x,y),rl);
      
      printf("tpz - tz %f\n",z-t->GetZ());
      printf("\n");
      hxyt->Fill(x,y);
      hxzt->Fill(x,z);
      
   }

  rl->LoadTrackRefs();
  TTree* treeTR = rl->TreeTR();
  b = treeTR->GetBranch("TPC");
  
  TClonesArray* trackrefs = new TClonesArray("AliTrackReference", 100);
  AliTrackReference* tref;
  b->SetAddress(&trackrefs);
  
  Int_t tlab = TMath::Abs(t->GetLabel());

  Int_t netr = (Int_t)treeTR->GetEntries();
  printf("Found %d entries in TR tree\n",netr);
  
  for (Int_t e = 0; e < netr; e++)
   { 
     treeTR->GetEntry(e);
     tref = (AliTrackReference*)trackrefs->At(0);
     if (tref == 0x0) continue;
     if (tref->GetTrack() != tlab) continue;
    
     printf("Found %d entries in TR array\n",trackrefs->GetEntries());
     
     for (Int_t i = 0; i < trackrefs->GetEntries(); i++)
      {
        tref = (AliTrackReference*)trackrefs->At(i);
        if (tref->GetTrack() != tlab) continue;
        x = tref->X();
        y = tref->Y();
        z = tref->Z();
        printf("Track Ref: x %f y %f z %f\n",tref->X(),tref->Y(),tref->Z());

        hxzTR->Fill(x,z);
        hxyTR->Fill(x,y);
        for (Int_t j = 1; j < 10; j++)
         {
            hxyTR->Fill(x, y+j*0.1);
            hxyTR->Fill(x, y-j*0.1);
            hxyTR->Fill(x+j*0.1,y);
            hxyTR->Fill(x-j*0.1,y);

            hxzTR->Fill(x,z-j*0.1);
            hxzTR->Fill(x,z+j*0.1);
            hxzTR->Fill(x-j*0.1,z);
            hxzTR->Fill(x+j*0.1,z);
         }
      }
      break; 
    }  
  hxz->Draw("");
//  hxzt->Draw("same");
  hxzTR->Draw("same");
  
  delete rl;
}
/***************************************************************/
Commit	Line	Data
f5de2f09	1	#include "AliHBTTrackPoints.h"
9616170a	2	//_________________________________
	3	////////////////////////////////////////////////////////////
	4	// //
	5	// class AliHBTTrackPoints //
	6	// //
	7	// used by Anti-Merging cut //
	8	// contains set of poits the lay on track trajectory //
	9	// according to reconstructed track parameters - //
	10	// NOT CLUSTERS POSITIONS!!! //
	11	// Anti-Merging cut is applied only on tracks coming from //
	12	// different events (that are use to fill deniminators) //
	13	// //
	14	////////////////////////////////////////////////////////////
81877d10	15	#include "AliTrackReference.h"
81877d10	16
f5de2f09	17	#include "AliTPCtrack.h"
81877d10	18	#include "AliESDtrack.h"
81877d10	19
f5de2f09	20	#include <TMath.h>
f5de2f09	21	#include <TClonesArray.h>
	22
	23	ClassImp(AliHBTTrackPoints)
	24
9616170a	25	Int_t AliHBTTrackPoints::fgDebug = 0;
f5de2f09	26	AliHBTTrackPoints::AliHBTTrackPoints():
	27	fN(0),
	28	fX(0x0),
	29	fY(0x0),
	30	fZ(0x0)
	31	{
	32	//constructor
	33	}
81877d10	34	AliHBTTrackPoints::AliHBTTrackPoints(const AliHBTTrackPoints& in):
	35	TObject(in),
	36	fN(in.fN),
	37	fX(new Float_t[fN]),
	38	fY(new Float_t[fN]),
	39	fZ(new Float_t[fN])
	40	{
	41	//cpy constructor
	42	for (Int_t i = 0; i < fN; i++)
	43	{
	44	fX[i] = in.fX[i];
	45	fY[i] = in.fY[i];
	46	fZ[i] = in.fZ[i];
	47	}
	48	}
	49	/***************************************************************/
	50
	51	AliHBTTrackPoints& AliHBTTrackPoints::operator=(const AliHBTTrackPoints& in)
	52	{
	53	//Assigment operator
	54	if(this == &in) return *this;
	55	TObject::operator=((const TObject&)in);
	56
	57	if (in.fN <= 0)
	58	{
	59	delete [] fX;
	60	delete [] fY;
	61	delete [] fZ;
	62	fN = 0;
	63	fX = 0x0;
	64	fY = 0x0;
	65	fZ = 0x0;
	66	return *this;
	67	}
	68
	69	if ( fN != in.fN )
	70	{
	71	delete [] fX;
	72	delete [] fY;
	73	delete [] fZ;
	74	fN = in.fN;
	75	fX = new Float_t[fN];
	76	fY = new Float_t[fN];
	77	fZ = new Float_t[fN];
	78	}
	79
	80	for (Int_t i = 0; i < fN; i++)
	81	{
	82	fX[i] = in.fX[i];
	83	fY[i] = in.fY[i];
	84	fZ[i] = in.fZ[i];
	85	}
	86
	87	return *this;
	88	}
	89	/***************************************************************/
	90
	91	AliHBTTrackPoints::AliHBTTrackPoints(Int_t n, AliESDtrack* track, Float_t mf, Float_t dr, Float_t r0):
	92	fN(n),
	93	fX(new Float_t[fN]),
	94	fY(new Float_t[fN]),
	95	fZ(new Float_t[fN])
	96	{
	97	//constructor
98	//mf - magnetic field in kG - needed to calculated curvature out of Pt
99	//r0 - starting radius
100	//dr - calculate points every dr cm, default every 30cm
101	if (track == 0x0)
102	{
103	Error("AliHBTTrackPoints","ESD track is null");
104	fN = 0;
105	delete [] fX;
106	delete [] fY;
107	delete [] fZ;
108	fX = fY = fZ = 0x0;
109	return;
110	}
111
112	Double_t x;
113	Double_t par[5];
114	track->GetInnerExternalParameters(x,par); //get properties of the track
115	if (x == 0)
116	{
117	Error("AliHBTTrackPoints","This ESD track does not contain TPC information");
118	return;
119	}
120
121	if (mf == 0.0)
122	{
123	Error("AliHBTTrackPoints","Zero Magnetic field passed as parameter.");
124	return;
125	}
126
127	Double_t alpha = track->GetInnerAlpha();
128	Double_t cc = 1000./0.299792458/mf;//conversion constant
129	Double_t c=par[4]/cc;
130
131	MakePoints(dr,r0,x,par,c,alpha);
132
133	}
9616170a	134	/***************************************************************/
f5de2f09	135
	136	AliHBTTrackPoints::AliHBTTrackPoints(Int_t n, AliTPCtrack* track, Float_t dr, Float_t r0):
	137	fN(n),
	138	fX(new Float_t[fN]),
	139	fY(new Float_t[fN]),
	140	fZ(new Float_t[fN])
	141	{
	142	//constructor
	143	//r0 starting radius
	144	//dr - calculate points every dr cm, default every 30cm
	145	if (track == 0x0)
	146	{
	147	Error("AliHBTTrackPoints","TPC track is null");
	148	fN = 0;
	149	delete [] fX;
	150	delete [] fY;
	151	delete [] fZ;
	152	fX = fY = fZ = 0x0;
	153	return;
	154	}
	155	track->PropagateTo(r0);
	156
	157	//* This formation is now fixed in the following way: *
	158	//* external param0: local Y-coordinate of a track (cm) *
	159	//* external param1: local Z-coordinate of a track (cm) *
	160	//* external param2: local sine of the track momentum azimuth angle *
	161	//* external param3: tangent of the track momentum dip angle *
	162	//* external param4: 1/pt (1/(GeV/c)) *
	163
81877d10	164	Double_t x = 0;
f5de2f09	165	Double_t par[5];
81877d10	166	track->GetExternalParameters(x,par); //get properties of the track
	167
	168	Double_t alpha = track->GetAlpha();
	169	Double_t c=track->GetC();
	170	MakePoints(dr,r0,x,par,c,alpha);
	171	}
	172
	173	void AliHBTTrackPoints::MakePoints( Float_t dr, Float_t r0, Double_t x, Double_t* par, Double_t c, Double_t alpha)
	174	{
	175	//Calculates points starting at radius r0
	176	//spacing every dr (in radial direction)
	177	// according to track parameters
	178	// x - position in sector local reference frame. x i parallel to R and sector is symmetric with respect to x
	179	// par - track external parameters; array with 5 elements; look at AliTPCtrack.h or AliESDtrack.h for their meaning
	180	// c - track curvature
	181	// alpha - sector's rotation angle (phi) == angle needed for local to global transformation
f5de2f09	182
81877d10	183	Double_t y = par[0];
81877d10	184	Double_t z0 = par[1];
f5de2f09	185
f5de2f09	186	Double_t phi0local = TMath::ATan2(y,x);
81877d10	187	Double_t phi0global = phi0local + alpha;
f5de2f09	188
	189	if (phi0local<0) phi0local+=2*TMath::Pi();
	190	if (phi0local>=2.TMath::Pi()) phi0local-=2TMath::Pi();
	191
	192	if (phi0global<0) phi0global+=2*TMath::Pi();
	193	if (phi0global>=2.TMath::Pi()) phi0global-=2TMath::Pi();
	194
	195	Double_t r = TMath::Hypot(x,y);
	196
	197
9616170a	198	if (GetDebug() > 9)
f5de2f09	199	Info("AliHBTTrackPoints","Radius0 %f, Real Radius %f",r0,r);
f5de2f09	200
9616170a	201	if (GetDebug() > 5)
f5de2f09	202	Info("AliHBTTrackPoints","Phi Global at first padraw %f, Phi locat %f",phi0global,phi0local);
81877d10	203
81877d10	204	Double_t eta = xc - par[2] ;//par[2] = fXC - eta; eta==fP2 ; C==fP4
f5de2f09	205
f5de2f09	206	//this calculattions are assuming new (current) model
81877d10	207	Double_t tmp = par[2];
f5de2f09	208	tmp = 1. - tmp*tmp;
	209	tmp = c*y + TMath::Sqrt(tmp);
	210	Double_t dca=(TMath::Hypot(eta,tmp) - 1. )/TMath::Abs(c);
	211
	212	//Here is old model Cold=Cnew/2.
	213	Double_t dcasq = dca*dca;
	214	Double_t c2 = c/2.;
	215	Double_t cst1 = (1.+c2dca)dca;//first constant
	216	Double_t cst2 = 1. + 2.c2dca;//second constant
	217
	218	Double_t factorPhi0 = TMath::ASin((c2*r + cst1/r)/cst2);
	219	Double_t factorZ0 = TMath::ASin(c2TMath::Sqrt((rr-dcasq)/cst2))*par[3]/c2;
	220
	221	for(Int_t i = 0; i<fN; i++)
	222	{
	223	Double_t rc = r0 + i*dr;
	224	Double_t factorPhi = TMath::ASin( (c2*rc + cst1/rc)/cst2 );//factor phi od rc
	225	Double_t phi = phi0global + factorPhi - factorPhi0;
	226
	227	Double_t factorZ = TMath::ASin(c2TMath::Sqrt((rcrc-dcasq)/cst2))*par[3]/c2;
	228	fZ[i] = z0 + factorZ - factorZ0;
	229	fX[i] = rc*TMath::Cos(phi);
	230	fY[i] = rc*TMath::Sin(phi);
	231
9616170a	232	if ( GetDebug() > 2 )
f5de2f09	233	{
	234	Info("AliHBTTrackPoints","X %f Y %f Z %f R asked %f R obtained %f",
	235	fX[i],fY[i],fZ[i],rc,TMath::Hypot(fX[i],fY[i]));
	236	}
	237	}
	238	}
9616170a	239	/***************************************************************/
f5de2f09	240
	241	AliHBTTrackPoints::~AliHBTTrackPoints()
	242	{
	243	//destructor
	244	delete [] fX;
	245	delete [] fY;
	246	delete [] fZ;
	247	}
9616170a	248	/***************************************************************/
f5de2f09	249
	250	void AliHBTTrackPoints::PositionAt(Int_t n, Float_t &x,Float_t &y,Float_t &z)
	251	{
	252	//returns position at point n
	253	if ((n<0) \|\| (n>fN))
	254	{
	255	Error("PositionAt","Point %d out of range",n);
	256	return;
	257	}
	258
	259	x = fX[n];
	260	y = fY[n];
	261	z = fZ[n];
9616170a	262	if ( GetDebug() > 1 )
f5de2f09	263	{
	264	Info("AliHBTTrackPoints","n %d; X %f; Y %f; Z %f",n,x,y,z);
	265	}
f5de2f09	266	}
9616170a	267	/***************************************************************/
f5de2f09	268
	269	Double_t AliHBTTrackPoints::AvarageDistance(const AliHBTTrackPoints& tr)
	270	{
	271	//returns the aritmethic avarage distance between two tracks
	272	if (fN != tr.fN)
	273	{
	274	Error("AvarageDistance","Number of points is not equal");
	275	return -1;
	276	}
	277	if ( (fN <= 0) \|\| (tr.fN <=0) )
	278	{
	279	Error("AvarageDistance","One of tracks is empty");
	280	return -1;
	281	}
	282
38b5f605	283	Double_t sum = 0;
f5de2f09	284	for (Int_t i = 0; i<fN; i++)
f5de2f09	285	{
9616170a	286	if (GetDebug()>9)
	287	{
	288	// Float_t r1sq = fX[i]fX[i]+fY[i]fY[i];
	289	// Float_t r2sq = tr.fX[i]tr.fX[i]+tr.fY[i]tr.fY[i];
	290	Float_t r1sq = TMath::Hypot(fX[i],fY[i]);
	291	Float_t r2sq = TMath::Hypot(tr.fX[i],tr.fY[i]);
	292	Info("AvarageDistance","radii: %f %f",r1sq,r2sq);
	293	}
	294
	295
	296	Double_t dx = fX[i]-tr.fX[i];
	297	Double_t dy = fY[i]-tr.fY[i];
	298	Double_t dz = fZ[i]-tr.fZ[i];
	299	sum+=TMath::Sqrt(dxdx + dydy + dz*dz);
	300
	301	if (GetDebug()>0)
	302	{
	303	Info("AvarageDistance","Diff: x ,y z: %f , %f, %f",dx,dy,dz);
	304	Info("AvarageDistance","xxyyzz %f %f %f %f %f %f",
	305	fX[i],tr.fX[i],fY[i],tr.fY[i],fZ[i],tr.fZ[i]);
	306	}
f5de2f09	307	}
9616170a	308
	309	Double_t retval = sum/((Double_t)fN);
	310	if ( GetDebug() )
	311	{
	312	Info("AvarageDistance","Avarage distance is %f.",retval);
	313	}
	314	return retval;
f5de2f09	315	}
9616170a	316	/***************************************************************/
	317	/***************************************************************/
	318	/***************************************************************/
81877d10	319	/***************************************************************/
	320	/***************************************************************/
	321	/***************************************************************/
f5de2f09	322
81877d10	323	/*
f5de2f09	324	#include "AliRun.h"
81877d10	325	#include "AliESD.h"
f5de2f09	326	#include "AliRunLoader.h"
	327	#include "AliTPCtrack.h"
	328	#include "TTree.h"
	329	#include "TBranch.h"
	330	#include "TH2D.h"
	331	#include "TCanvas.h"
	332	#include "AliMagF.h"
	333
	334
	335
81877d10	336
	337	void AliHBTTrackPoints::testesd(Int_t entr,const char* fname )
	338	{
	339	//testing routine
	340	delete gAlice;
	341	gAlice = 0x0;
	342	AliRunLoader* rl = AliRunLoader::Open();
	343	rl->LoadgAlice();
	344
	345	Float_t mf = rl->GetAliRun()->Field()->SolenoidField();
	346
	347
	348	TFile* fFile = TFile::Open(fname);
	349
	350	if (fFile == 0x0)
	351	{
	352	printf("testesd: There is no suche a ESD file\n");
	353	return;
	354	}
	355	AliESD* esd = dynamic_cast<AliESD*>(fFile->Get("0"));
	356	AliESDtrack *t = esd->GetTrack(entr);
	357	if (t == 0x0)
	358	{
	359	::Error("testesd","Can not get track %d",entr);
	360	return;
	361	}
	362
	363
	364	Int_t N = 170;
	365	AliHBTTrackPoints* tp = new AliHBTTrackPoints(N,t,mf,1.);
	366
	367	Float_t xmin = -250;
	368	Float_t xmax = 250;
	369
	370	Float_t ymin = -250;
	371	Float_t ymax = 250;
	372
	373	Float_t zmin = -250;
	374	Float_t zmax = 250;
	375
	376	TH2D* hxy = new TH2D("hxy","hxy",1000,xmin,xmax,1000,ymin,ymax);
	377	TH2D* hxyt = new TH2D("hxyt","hxyt",1000,xmin,xmax,1000,ymin,ymax);
	378	TH2D* hxyTR = new TH2D("hxyTR","hxyTR",1000,xmin,xmax,1000,ymin,ymax);
	379
	380	TH2D* hxz = new TH2D("hxz","hxz",1000,xmin,xmax,1000,zmin,zmax);
	381	TH2D* hxzt = new TH2D("hxzt","hxzt",1000,xmin,xmax,1000,zmin,zmax);
	382	TH2D* hxzTR = new TH2D("hxzTR","hxzTR",1000,xmin,xmax,1000,zmin,zmax);
	383
	384	hxyt->SetDirectory(0x0);
	385	hxy->SetDirectory(0x0);
	386	hxyTR->SetDirectory(0x0);
	387
	388	hxzt->SetDirectory(0x0);
	389	hxz->SetDirectory(0x0);
	390	hxzTR->SetDirectory(0x0);
	391
	392	Float_t x,y,z;
	393
	394	for (Int_t i = 0;i<N;i++)
	395	{
	396	Double_t r = 84.1+i;
	397	tp->PositionAt(i,x,y,z);
	398	hxy->Fill(x,y);
	399	hxz->Fill(x,z);
400	printf("Rdemanded %f\n",r);
401	printf("tpx %f tpy %f tpz %f Rt =%f\n", x,y,z,TMath::Hypot(x,y));
402
403	}
404
405	rl->LoadTrackRefs();
406	TTree* treeTR = rl->TreeTR();
407	TBranch* b = treeTR->GetBranch("TPC");
408
409	TClonesArray* trackrefs = new TClonesArray("AliTrackReference", 100);
410	AliTrackReference* tref;
411	b->SetAddress(&trackrefs);
412
413	Int_t tlab = TMath::Abs(t->GetLabel());
414
415	Int_t netr = (Int_t)treeTR->GetEntries();
416	printf("Found %d entries in TR tree\n",netr);
417
418	for (Int_t e = 0; e < netr; e++)
419	{
420	treeTR->GetEntry(e);
421	tref = (AliTrackReference*)trackrefs->At(0);
422	if (tref == 0x0) continue;
423	if (tref->GetTrack() != tlab) continue;
424
425	printf("Found %d entries in TR array\n",trackrefs->GetEntries());
426
427	for (Int_t i = 0; i < trackrefs->GetEntries(); i++)
428	{
429	tref = (AliTrackReference*)trackrefs->At(i);
430	if (tref->GetTrack() != tlab) continue;
431	x = tref->X();
432	y = tref->Y();
433	z = tref->Z();
434	printf("Track Ref: x %f y %f z %f\n",tref->X(),tref->Y(),tref->Z());
435
436	hxzTR->Fill(x,z);
437	hxyTR->Fill(x,y);
438	for (Int_t j = 1; j < 10; j++)
439	{
440	hxyTR->Fill(x, y+j*0.1);
441	hxyTR->Fill(x, y-j*0.1);
442	hxyTR->Fill(x+j*0.1,y);
443	hxyTR->Fill(x-j*0.1,y);
444
445	hxzTR->Fill(x,z-j*0.1);
446	hxzTR->Fill(x,z+j*0.1);
447	hxzTR->Fill(x-j*0.1,z);
448	hxzTR->Fill(x+j*0.1,z);
449	}
450	}
451	break;
452	}
453	hxy->Draw("");
454	// hxzt->Draw("same");
455	hxyTR->Draw("same");
456
457	delete rl;
458	}
459
460	/***************************************************************/
461	/***************************************************************/
462	/***************************************************************/
463	/*
464	void AliHBTTrackPoints::testtpc(Int_t entr)
f5de2f09	465	{
81877d10	466	//testing routine
81877d10	467
f5de2f09	468	delete gAlice;
	469	gAlice = 0x0;
	470	AliRunLoader* rl = AliRunLoader::Open();
	471	AliLoader* l = rl->GetLoader("TPCLoader");
	472	rl->LoadgAlice();
	473	AliKalmanTrack::SetConvConst(100/0.299792458/0.2/rl->GetAliRun()->Field()->Factor());
	474	l->LoadTracks();
	475	AliTPCtrack* t = new AliTPCtrack();
	476	TBranch* b=l->TreeT()->GetBranch("tracks");
	477	b->SetAddress(&t);
	478	l->TreeT()->GetEntry(entr);
	479	Int_t N = 160;
	480	AliHBTTrackPoints* tp = new AliHBTTrackPoints(N,t,1.);
	481
81877d10	482	Float_t xmin = -250;
	483	Float_t xmax = 250;
	484
	485	Float_t ymin = -250;
	486	Float_t ymax = 250;
f5de2f09	487
81877d10	488	Float_t zmin = -250;
	489	Float_t zmax = 250;
	490
	491	TH2D* hxy = new TH2D("hxy","hxy",1000,xmin,xmax,1000,ymin,ymax);
	492	TH2D* hxyt = new TH2D("hxyt","hxyt",1000,xmin,xmax,1000,ymin,ymax);
	493	TH2D* hxyTR = new TH2D("hxyTR","hxyTR",1000,xmin,xmax,1000,ymin,ymax);
	494
	495	TH2D* hxz = new TH2D("hxz","hxz",1000,xmin,xmax,1000,zmin,zmax);
	496	TH2D* hxzt = new TH2D("hxzt","hxzt",1000,xmin,xmax,1000,zmin,zmax);
	497	TH2D* hxzTR = new TH2D("hxzTR","hxzTR",1000,xmin,xmax,1000,zmin,zmax);
f5de2f09	498
	499	hxyt->SetDirectory(0x0);
	500	hxy->SetDirectory(0x0);
	501	hxyTR->SetDirectory(0x0);
	502
	503	hxzt->SetDirectory(0x0);
	504	hxz->SetDirectory(0x0);
	505	hxzTR->SetDirectory(0x0);
	506
	507	Float_t x,y,z;
	508
	509	for (Int_t i = 0;i<N;i++)
	510	{
	511	Double_t r = 84.1+i;
	512	tp->PositionAt(i,x,y,z);
	513	hxy->Fill(x,y);
	514	hxz->Fill(x,z);
	515	printf("Rdemanded %f\n",r);
	516	printf("tpx %f tpy %f tpz %f Rt =%f\n", x,y,z,TMath::Hypot(x,y));
	517
	518	//BUT they are local!!!!
	519	t->PropagateTo(r);
f237a6b2	520	// Double_t phi = t->Phi();
f5de2f09	521	Double_t rl = TMath::Hypot(t->GetX(),t->GetY());//real radius
	522
	523	Double_t alpha = t->GetAlpha();
	524	Double_t salpha = TMath::Sin(alpha);
	525	Double_t calpha = TMath::Cos(alpha);
	526	x = t->GetX()calpha - t->GetY()salpha;
	527	y = t->GetX()salpha + t->GetY()calpha;
	528	z = t->GetZ();
	529
	530	printf("tx %f ty %f tz %f Rt = %f R from XY %f\n",x,y,z,TMath::Hypot(x,y),rl);
	531
	532	printf("tpz - tz %f\n",z-t->GetZ());
	533	printf("\n");
	534	hxyt->Fill(x,y);
	535	hxzt->Fill(x,z);
	536
	537	}
	538
	539	rl->LoadTrackRefs();
	540	TTree* treeTR = rl->TreeTR();
	541	b = treeTR->GetBranch("TPC");
	542
	543	TClonesArray* trackrefs = new TClonesArray("AliTrackReference", 100);
	544	AliTrackReference* tref;
	545	b->SetAddress(&trackrefs);
	546
	547	Int_t tlab = TMath::Abs(t->GetLabel());
	548
f237a6b2	549	Int_t netr = (Int_t)treeTR->GetEntries();
f5de2f09	550	printf("Found %d entries in TR tree\n",netr);
	551
	552	for (Int_t e = 0; e < netr; e++)
	553	{
	554	treeTR->GetEntry(e);
	555	tref = (AliTrackReference*)trackrefs->At(0);
	556	if (tref == 0x0) continue;
	557	if (tref->GetTrack() != tlab) continue;
	558
	559	printf("Found %d entries in TR array\n",trackrefs->GetEntries());
	560
	561	for (Int_t i = 0; i < trackrefs->GetEntries(); i++)
	562	{
	563	tref = (AliTrackReference*)trackrefs->At(i);
	564	if (tref->GetTrack() != tlab) continue;
	565	x = tref->X();
	566	y = tref->Y();
	567	z = tref->Z();
	568	printf("Track Ref: x %f y %f z %f\n",tref->X(),tref->Y(),tref->Z());
	569
	570	hxzTR->Fill(x,z);
	571	hxyTR->Fill(x,y);
	572	for (Int_t j = 1; j < 10; j++)
	573	{
	574	hxyTR->Fill(x, y+j*0.1);
	575	hxyTR->Fill(x, y-j*0.1);
	576	hxyTR->Fill(x+j*0.1,y);
	577	hxyTR->Fill(x-j*0.1,y);
	578
	579	hxzTR->Fill(x,z-j*0.1);
	580	hxzTR->Fill(x,z+j*0.1);
	581	hxzTR->Fill(x-j*0.1,z);
	582	hxzTR->Fill(x+j*0.1,z);
	583	}
	584	}
	585	break;
	586	}
	587	hxz->Draw("");
	588	// hxzt->Draw("same");
	589	hxzTR->Draw("same");
	590
	591	delete rl;
	592	}
81877d10	593	/***************************************************************/