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

//_________________________________
////////////////////////////////////////////////////////////
//                                                        //
// 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 <TClonesArray.h>
#include <TFile.h>
#include <TMath.h>

#include "AliESDtrack.h"
#include "AliHBTTrackPoints.h"
#include "AliTPCtrack.h"
#include "AliTrackReference.h"

ClassImp(AliHBTTrackPoints)

Int_t AliHBTTrackPoints::fgDebug = 0;
AliHBTTrackPoints::AliHBTTrackPoints():
 fN(0),
 fX(0x0),
 fY(0x0),
 fZ(0x0)
{
  //constructor
}
/***************************************************************/

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;
   }

  if ( ((track->GetStatus() & AliESDtrack::kTPCrefit) == kFALSE)&& 
       ((track->GetStatus() & AliESDtrack::kTPCin) == kFALSE)  )
   {
     //could happend: its stand alone tracking
     if (GetDebug() > 3) 
       Warning("AliHBTTrackPoints","This ESD track does not contain TPC information");
       
     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 (par[4] == 0)
   {
     Error("AliHBTTrackPoints","This ESD track seem not to contain TPC information (curv is 0)");
     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 ftmp = (c2*rc + cst1/rc)/cst2;
     if (ftmp > 1.0) 
      {
        if (GetDebug() > 1) 
          Warning("AliHBTTrackPoints","ASin argument > 1 %f:",ftmp);
        ftmp=1.0;
      }
     else if (ftmp < -1.0) 
      {
        if (GetDebug() > 1) 
          Warning("AliHBTTrackPoints","ASin argument < -1 %f:",ftmp);
        ftmp=-1.0;
      }
      
     Double_t factorPhi = TMath::ASin( ftmp );//factor phi od rc
     Double_t phi = phi0global + factorPhi - factorPhi0;
     
     ftmp = (rc*rc-dcasq)/cst2;
     if (ftmp < 0.0) 
      {
        if (GetDebug() > 1) 
          Warning("AliHBTTrackPoints","Sqrt argument < 0: %f",ftmp);
        ftmp=0.0;
      }
     
     ftmp = c2*TMath::Sqrt(ftmp);
     if (ftmp > 1.0) 
      {
        if (GetDebug() > 1) 
          Warning("AliHBTTrackPoints","ASin argument > 1: %f",ftmp);
        ftmp=1.0;
      }
     else if (ftmp < -1.0) 
      {
        if (GetDebug() > 1) 
          Warning("AliHBTTrackPoints","ASin argument < -1: %f",ftmp);
        ftmp=-1.0;
      }
     Double_t factorZ = TMath::ASin(ftmp)*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
//  Info("AvarageDistance","Entered");
  if ( (fN <= 0) || (tr.fN <=0) )
   {
     if (GetDebug()) Warning("AvarageDistance","One of tracks is empty");
     return -1;
   }

  if (fN != tr.fN)
   {
     Warning("AvarageDistance","Number of points is not equal");
     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()>1)
      {
       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 )
{
  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)
{
  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
9616170a	1	//_________________________________
	2	////////////////////////////////////////////////////////////
	3	// //
	4	// class AliHBTTrackPoints //
	5	// //
	6	// used by Anti-Merging cut //
	7	// contains set of poits the lay on track trajectory //
	8	// according to reconstructed track parameters - //
	9	// NOT CLUSTERS POSITIONS!!! //
	10	// Anti-Merging cut is applied only on tracks coming from //
	11	// different events (that are use to fill deniminators) //
	12	// //
	13	////////////////////////////////////////////////////////////
81877d10	14
f5de2f09	15	#include <TClonesArray.h>
024a7e64	16	#include <TFile.h>
	17	#include <TMath.h>
	18
	19	#include "AliESDtrack.h"
	20	#include "AliHBTTrackPoints.h"
	21	#include "AliTPCtrack.h"
	22	#include "AliTrackReference.h"
f5de2f09	23
	24	ClassImp(AliHBTTrackPoints)
	25
9616170a	26	Int_t AliHBTTrackPoints::fgDebug = 0;
f5de2f09	27	AliHBTTrackPoints::AliHBTTrackPoints():
	28	fN(0),
	29	fX(0x0),
	30	fY(0x0),
	31	fZ(0x0)
	32	{
	33	//constructor
	34	}
81877d10	35	/***************************************************************/
	36
	37	AliHBTTrackPoints::AliHBTTrackPoints(Int_t n, AliESDtrack* track, Float_t mf, Float_t dr, Float_t r0):
	38	fN(n),
	39	fX(new Float_t[fN]),
	40	fY(new Float_t[fN]),
	41	fZ(new Float_t[fN])
	42	{
	43	//constructor
	44	//mf - magnetic field in kG - needed to calculated curvature out of Pt
	45	//r0 - starting radius
	46	//dr - calculate points every dr cm, default every 30cm
	47	if (track == 0x0)
	48	{
	49	Error("AliHBTTrackPoints","ESD track is null");
	50	fN = 0;
	51	delete [] fX;
	52	delete [] fY;
	53	delete [] fZ;
	54	fX = fY = fZ = 0x0;
	55	return;
	56	}
88378f71	57
7f571143	58	if ( ((track->GetStatus() & AliESDtrack::kTPCrefit) == kFALSE)&&
	59	((track->GetStatus() & AliESDtrack::kTPCin) == kFALSE) )
	60	{
	61	//could happend: its stand alone tracking
	62	if (GetDebug() > 3)
	63	Warning("AliHBTTrackPoints","This ESD track does not contain TPC information");
	64
	65	fN = 0;
	66	delete [] fX;
	67	delete [] fY;
	68	delete [] fZ;
	69	fX = fY = fZ = 0x0;
	70
	71	return;
	72	}
	73
88378f71	74	Double_t x;
	75	Double_t par[5];
	76	track->GetInnerExternalParameters(x,par); //get properties of the track
ef28fa5f	77	if (par[4] == 0)
84755ec0	78	{
7f571143	79	Error("AliHBTTrackPoints","This ESD track seem not to contain TPC information (curv is 0)");
88378f71	80	return;
	81	}
	82
	83	if (mf == 0.0)
	84	{
	85	Error("AliHBTTrackPoints","Zero Magnetic field passed as parameter.");
	86	return;
84755ec0	87	}
81877d10	88
88378f71	89	Double_t alpha = track->GetInnerAlpha();
	90	Double_t cc = 1000./0.299792458/mf;//conversion constant
	91	Double_t c=par[4]/cc;
	92
	93	MakePoints(dr,r0,x,par,c,alpha);
81877d10	94
81877d10	95	}
9616170a	96	/***************************************************************/
f5de2f09	97
	98	AliHBTTrackPoints::AliHBTTrackPoints(Int_t n, AliTPCtrack* track, Float_t dr, Float_t r0):
	99	fN(n),
	100	fX(new Float_t[fN]),
	101	fY(new Float_t[fN]),
	102	fZ(new Float_t[fN])
	103	{
	104	//constructor
	105	//r0 starting radius
	106	//dr - calculate points every dr cm, default every 30cm
	107	if (track == 0x0)
	108	{
	109	Error("AliHBTTrackPoints","TPC track is null");
	110	fN = 0;
	111	delete [] fX;
	112	delete [] fY;
	113	delete [] fZ;
	114	fX = fY = fZ = 0x0;
	115	return;
	116	}
	117	track->PropagateTo(r0);
	118
	119	//* This formation is now fixed in the following way: *
	120	//* external param0: local Y-coordinate of a track (cm) *
	121	//* external param1: local Z-coordinate of a track (cm) *
	122	//* external param2: local sine of the track momentum azimuth angle *
	123	//* external param3: tangent of the track momentum dip angle *
	124	//* external param4: 1/pt (1/(GeV/c)) *
	125
81877d10	126	Double_t x = 0;
f5de2f09	127	Double_t par[5];
81877d10	128	track->GetExternalParameters(x,par); //get properties of the track
	129
	130	Double_t alpha = track->GetAlpha();
	131	Double_t c=track->GetC();
	132	MakePoints(dr,r0,x,par,c,alpha);
	133	}
	134
	135	void AliHBTTrackPoints::MakePoints( Float_t dr, Float_t r0, Double_t x, Double_t* par, Double_t c, Double_t alpha)
	136	{
	137	//Calculates points starting at radius r0
	138	//spacing every dr (in radial direction)
	139	// according to track parameters
	140	// x - position in sector local reference frame. x i parallel to R and sector is symmetric with respect to x
	141	// par - track external parameters; array with 5 elements; look at AliTPCtrack.h or AliESDtrack.h for their meaning
	142	// c - track curvature
	143	// alpha - sector's rotation angle (phi) == angle needed for local to global transformation
f5de2f09	144
81877d10	145	Double_t y = par[0];
81877d10	146	Double_t z0 = par[1];
f5de2f09	147
f5de2f09	148	Double_t phi0local = TMath::ATan2(y,x);
81877d10	149	Double_t phi0global = phi0local + alpha;
f5de2f09	150
	151	if (phi0local<0) phi0local+=2*TMath::Pi();
	152	if (phi0local>=2.TMath::Pi()) phi0local-=2TMath::Pi();
	153
	154	if (phi0global<0) phi0global+=2*TMath::Pi();
	155	if (phi0global>=2.TMath::Pi()) phi0global-=2TMath::Pi();
	156
	157	Double_t r = TMath::Hypot(x,y);
	158
	159
9616170a	160	if (GetDebug() > 9)
f5de2f09	161	Info("AliHBTTrackPoints","Radius0 %f, Real Radius %f",r0,r);
f5de2f09	162
9616170a	163	if (GetDebug() > 5)
f5de2f09	164	Info("AliHBTTrackPoints","Phi Global at first padraw %f, Phi locat %f",phi0global,phi0local);
81877d10	165
81877d10	166	Double_t eta = xc - par[2] ;//par[2] = fXC - eta; eta==fP2 ; C==fP4
f5de2f09	167
f5de2f09	168	//this calculattions are assuming new (current) model
81877d10	169	Double_t tmp = par[2];
f5de2f09	170	tmp = 1. - tmp*tmp;
	171	tmp = c*y + TMath::Sqrt(tmp);
	172	Double_t dca=(TMath::Hypot(eta,tmp) - 1. )/TMath::Abs(c);
	173
	174	//Here is old model Cold=Cnew/2.
	175	Double_t dcasq = dca*dca;
	176	Double_t c2 = c/2.;
	177	Double_t cst1 = (1.+c2dca)dca;//first constant
	178	Double_t cst2 = 1. + 2.c2dca;//second constant
	179
	180	Double_t factorPhi0 = TMath::ASin((c2*r + cst1/r)/cst2);
	181	Double_t factorZ0 = TMath::ASin(c2TMath::Sqrt((rr-dcasq)/cst2))*par[3]/c2;
	182
	183	for(Int_t i = 0; i<fN; i++)
	184	{
	185	Double_t rc = r0 + i*dr;
af0fd768	186	Double_t ftmp = (c2*rc + cst1/rc)/cst2;
	187	if (ftmp > 1.0)
	188	{
7f571143	189	if (GetDebug() > 1)
7f571143	190	Warning("AliHBTTrackPoints","ASin argument > 1 %f:",ftmp);
af0fd768	191	ftmp=1.0;
	192	}
	193	else if (ftmp < -1.0)
	194	{
7f571143	195	if (GetDebug() > 1)
7f571143	196	Warning("AliHBTTrackPoints","ASin argument < -1 %f:",ftmp);
af0fd768	197	ftmp=-1.0;
	198	}
	199
	200	Double_t factorPhi = TMath::ASin( ftmp );//factor phi od rc
f5de2f09	201	Double_t phi = phi0global + factorPhi - factorPhi0;
f5de2f09	202
af0fd768	203	ftmp = (rc*rc-dcasq)/cst2;
	204	if (ftmp < 0.0)
	205	{
7f571143	206	if (GetDebug() > 1)
	207	Warning("AliHBTTrackPoints","Sqrt argument < 0: %f",ftmp);
	208	ftmp=0.0;
af0fd768	209	}
	210
	211	ftmp = c2*TMath::Sqrt(ftmp);
	212	if (ftmp > 1.0)
	213	{
7f571143	214	if (GetDebug() > 1)
7f571143	215	Warning("AliHBTTrackPoints","ASin argument > 1: %f",ftmp);
af0fd768	216	ftmp=1.0;
	217	}
	218	else if (ftmp < -1.0)
	219	{
7f571143	220	if (GetDebug() > 1)
7f571143	221	Warning("AliHBTTrackPoints","ASin argument < -1: %f",ftmp);
af0fd768	222	ftmp=-1.0;
	223	}
	224	Double_t factorZ = TMath::ASin(ftmp)*par[3]/c2;
f5de2f09	225	fZ[i] = z0 + factorZ - factorZ0;
	226	fX[i] = rc*TMath::Cos(phi);
	227	fY[i] = rc*TMath::Sin(phi);
	228
9616170a	229	if ( GetDebug() > 2 )
f5de2f09	230	{
	231	Info("AliHBTTrackPoints","X %f Y %f Z %f R asked %f R obtained %f",
	232	fX[i],fY[i],fZ[i],rc,TMath::Hypot(fX[i],fY[i]));
	233	}
	234	}
	235	}
9616170a	236	/***************************************************************/
f5de2f09	237
	238	AliHBTTrackPoints::~AliHBTTrackPoints()
	239	{
	240	//destructor
	241	delete [] fX;
	242	delete [] fY;
	243	delete [] fZ;
	244	}
9616170a	245	/***************************************************************/
f5de2f09	246
	247	void AliHBTTrackPoints::PositionAt(Int_t n, Float_t &x,Float_t &y,Float_t &z)
	248	{
	249	//returns position at point n
	250	if ((n<0) \|\| (n>fN))
	251	{
	252	Error("PositionAt","Point %d out of range",n);
	253	return;
	254	}
	255
	256	x = fX[n];
	257	y = fY[n];
	258	z = fZ[n];
9616170a	259	if ( GetDebug() > 1 )
f5de2f09	260	{
	261	Info("AliHBTTrackPoints","n %d; X %f; Y %f; Z %f",n,x,y,z);
	262	}
f5de2f09	263	}
9616170a	264	/***************************************************************/
f5de2f09	265
	266	Double_t AliHBTTrackPoints::AvarageDistance(const AliHBTTrackPoints& tr)
	267	{
	268	//returns the aritmethic avarage distance between two tracks
7f571143	269	// Info("AvarageDistance","Entered");
7f571143	270	if ( (fN <= 0) \|\| (tr.fN <=0) )
f5de2f09	271	{
7f571143	272	if (GetDebug()) Warning("AvarageDistance","One of tracks is empty");
f5de2f09	273	return -1;
f5de2f09	274	}
7f571143	275
7f571143	276	if (fN != tr.fN)
f5de2f09	277	{
7f571143	278	Warning("AvarageDistance","Number of points is not equal");
f5de2f09	279	return -1;
	280	}
	281
38b5f605	282	Double_t sum = 0;
f5de2f09	283	for (Int_t i = 0; i<fN; i++)
f5de2f09	284	{
9616170a	285	if (GetDebug()>9)
	286	{
	287	// Float_t r1sq = fX[i]fX[i]+fY[i]fY[i];
	288	// Float_t r2sq = tr.fX[i]tr.fX[i]+tr.fY[i]tr.fY[i];
	289	Float_t r1sq = TMath::Hypot(fX[i],fY[i]);
	290	Float_t r2sq = TMath::Hypot(tr.fX[i],tr.fY[i]);
	291	Info("AvarageDistance","radii: %f %f",r1sq,r2sq);
	292	}
	293
	294
	295	Double_t dx = fX[i]-tr.fX[i];
	296	Double_t dy = fY[i]-tr.fY[i];
	297	Double_t dz = fZ[i]-tr.fZ[i];
	298	sum+=TMath::Sqrt(dxdx + dydy + dz*dz);
	299
7f571143	300	if (GetDebug()>1)
9616170a	301	{
	302	Info("AvarageDistance","Diff: x ,y z: %f , %f, %f",dx,dy,dz);
	303	Info("AvarageDistance","xxyyzz %f %f %f %f %f %f",
	304	fX[i],tr.fX[i],fY[i],tr.fY[i],fZ[i],tr.fZ[i]);
	305	}
f5de2f09	306	}
9616170a	307
	308	Double_t retval = sum/((Double_t)fN);
	309	if ( GetDebug() )
	310	{
	311	Info("AvarageDistance","Avarage distance is %f.",retval);
	312	}
	313	return retval;
f5de2f09	314	}
9616170a	315	/***************************************************************/
	316	/***************************************************************/
	317	/***************************************************************/
81877d10	318	/***************************************************************/
	319	/***************************************************************/
	320	/***************************************************************/
f5de2f09	321
f5de2f09	322	#include "AliRun.h"
81877d10	323	#include "AliESD.h"
f5de2f09	324	#include "AliRunLoader.h"
	325	#include "AliTPCtrack.h"
	326	#include "TTree.h"
	327	#include "TBranch.h"
	328	#include "TH2D.h"
	329	#include "TCanvas.h"
	330	#include "AliMagF.h"
	331
	332
	333
81877d10	334
	335	void AliHBTTrackPoints::testesd(Int_t entr,const char* fname )
	336	{
81877d10	337	delete gAlice;
	338	gAlice = 0x0;
	339	AliRunLoader* rl = AliRunLoader::Open();
	340	rl->LoadgAlice();
	341
	342	Float_t mf = rl->GetAliRun()->Field()->SolenoidField();
	343
	344
	345	TFile* fFile = TFile::Open(fname);
	346
	347	if (fFile == 0x0)
	348	{
	349	printf("testesd: There is no suche a ESD file\n");
	350	return;
	351	}
	352	AliESD* esd = dynamic_cast<AliESD*>(fFile->Get("0"));
	353	AliESDtrack *t = esd->GetTrack(entr);
	354	if (t == 0x0)
	355	{
	356	::Error("testesd","Can not get track %d",entr);
	357	return;
	358	}
	359
	360
	361	Int_t N = 170;
	362	AliHBTTrackPoints* tp = new AliHBTTrackPoints(N,t,mf,1.);
	363
	364	Float_t xmin = -250;
	365	Float_t xmax = 250;
	366
	367	Float_t ymin = -250;
	368	Float_t ymax = 250;
	369
	370	Float_t zmin = -250;
	371	Float_t zmax = 250;
	372
	373	TH2D* hxy = new TH2D("hxy","hxy",1000,xmin,xmax,1000,ymin,ymax);
	374	TH2D* hxyt = new TH2D("hxyt","hxyt",1000,xmin,xmax,1000,ymin,ymax);
	375	TH2D* hxyTR = new TH2D("hxyTR","hxyTR",1000,xmin,xmax,1000,ymin,ymax);
	376
	377	TH2D* hxz = new TH2D("hxz","hxz",1000,xmin,xmax,1000,zmin,zmax);
	378	TH2D* hxzt = new TH2D("hxzt","hxzt",1000,xmin,xmax,1000,zmin,zmax);
	379	TH2D* hxzTR = new TH2D("hxzTR","hxzTR",1000,xmin,xmax,1000,zmin,zmax);
	380
	381	hxyt->SetDirectory(0x0);
	382	hxy->SetDirectory(0x0);
	383	hxyTR->SetDirectory(0x0);
	384
	385	hxzt->SetDirectory(0x0);
	386	hxz->SetDirectory(0x0);
	387	hxzTR->SetDirectory(0x0);
	388
	389	Float_t x,y,z;
	390
	391	for (Int_t i = 0;i<N;i++)
	392	{
	393	Double_t r = 84.1+i;
	394	tp->PositionAt(i,x,y,z);
	395	hxy->Fill(x,y);
	396	hxz->Fill(x,z);
	397	printf("Rdemanded %f\n",r);
	398	printf("tpx %f tpy %f tpz %f Rt =%f\n", x,y,z,TMath::Hypot(x,y));
	399
	400	}
401
402	rl->LoadTrackRefs();
403	TTree* treeTR = rl->TreeTR();
404	TBranch* b = treeTR->GetBranch("TPC");
405
406	TClonesArray* trackrefs = new TClonesArray("AliTrackReference", 100);
407	AliTrackReference* tref;
408	b->SetAddress(&trackrefs);
409
410	Int_t tlab = TMath::Abs(t->GetLabel());
411
412	Int_t netr = (Int_t)treeTR->GetEntries();
413	printf("Found %d entries in TR tree\n",netr);
414
415	for (Int_t e = 0; e < netr; e++)
416	{
417	treeTR->GetEntry(e);
418	tref = (AliTrackReference*)trackrefs->At(0);
419	if (tref == 0x0) continue;
420	if (tref->GetTrack() != tlab) continue;
421
422	printf("Found %d entries in TR array\n",trackrefs->GetEntries());
423
424	for (Int_t i = 0; i < trackrefs->GetEntries(); i++)
425	{
426	tref = (AliTrackReference*)trackrefs->At(i);
427	if (tref->GetTrack() != tlab) continue;
428	x = tref->X();
429	y = tref->Y();
430	z = tref->Z();
431	printf("Track Ref: x %f y %f z %f\n",tref->X(),tref->Y(),tref->Z());
432
433	hxzTR->Fill(x,z);
434	hxyTR->Fill(x,y);
435	for (Int_t j = 1; j < 10; j++)
436	{
437	hxyTR->Fill(x, y+j*0.1);
438	hxyTR->Fill(x, y-j*0.1);
439	hxyTR->Fill(x+j*0.1,y);
440	hxyTR->Fill(x-j*0.1,y);
441
442	hxzTR->Fill(x,z-j*0.1);
443	hxzTR->Fill(x,z+j*0.1);
444	hxzTR->Fill(x-j*0.1,z);
445	hxzTR->Fill(x+j*0.1,z);
446	}
447	}
448	break;
449	}
450	hxy->Draw("");
451	// hxzt->Draw("same");
452	hxyTR->Draw("same");
453
454	delete rl;
455	}
456
457	/***************************************************************/
458	/***************************************************************/
459	/***************************************************************/
a1d9ea02	460
81877d10	461	void AliHBTTrackPoints::testtpc(Int_t entr)
f5de2f09	462	{
	463	delete gAlice;
	464	gAlice = 0x0;
	465	AliRunLoader* rl = AliRunLoader::Open();
	466	AliLoader* l = rl->GetLoader("TPCLoader");
	467	rl->LoadgAlice();
	468	AliKalmanTrack::SetConvConst(100/0.299792458/0.2/rl->GetAliRun()->Field()->Factor());
	469	l->LoadTracks();
	470	AliTPCtrack* t = new AliTPCtrack();
	471	TBranch* b=l->TreeT()->GetBranch("tracks");
	472	b->SetAddress(&t);
	473	l->TreeT()->GetEntry(entr);
	474	Int_t N = 160;
	475	AliHBTTrackPoints* tp = new AliHBTTrackPoints(N,t,1.);
	476
81877d10	477	Float_t xmin = -250;
	478	Float_t xmax = 250;
	479
	480	Float_t ymin = -250;
	481	Float_t ymax = 250;
f5de2f09	482
81877d10	483	Float_t zmin = -250;
	484	Float_t zmax = 250;
	485
	486	TH2D* hxy = new TH2D("hxy","hxy",1000,xmin,xmax,1000,ymin,ymax);
	487	TH2D* hxyt = new TH2D("hxyt","hxyt",1000,xmin,xmax,1000,ymin,ymax);
	488	TH2D* hxyTR = new TH2D("hxyTR","hxyTR",1000,xmin,xmax,1000,ymin,ymax);
	489
	490	TH2D* hxz = new TH2D("hxz","hxz",1000,xmin,xmax,1000,zmin,zmax);
	491	TH2D* hxzt = new TH2D("hxzt","hxzt",1000,xmin,xmax,1000,zmin,zmax);
	492	TH2D* hxzTR = new TH2D("hxzTR","hxzTR",1000,xmin,xmax,1000,zmin,zmax);
f5de2f09	493
	494	hxyt->SetDirectory(0x0);
	495	hxy->SetDirectory(0x0);
	496	hxyTR->SetDirectory(0x0);
	497
	498	hxzt->SetDirectory(0x0);
	499	hxz->SetDirectory(0x0);
	500	hxzTR->SetDirectory(0x0);
	501
	502	Float_t x,y,z;
	503
	504	for (Int_t i = 0;i<N;i++)
	505	{
	506	Double_t r = 84.1+i;
	507	tp->PositionAt(i,x,y,z);
	508	hxy->Fill(x,y);
	509	hxz->Fill(x,z);
	510	printf("Rdemanded %f\n",r);
	511	printf("tpx %f tpy %f tpz %f Rt =%f\n", x,y,z,TMath::Hypot(x,y));
	512
	513	//BUT they are local!!!!
	514	t->PropagateTo(r);
f237a6b2	515	// Double_t phi = t->Phi();
f5de2f09	516	Double_t rl = TMath::Hypot(t->GetX(),t->GetY());//real radius
	517
	518	Double_t alpha = t->GetAlpha();
	519	Double_t salpha = TMath::Sin(alpha);
	520	Double_t calpha = TMath::Cos(alpha);
	521	x = t->GetX()calpha - t->GetY()salpha;
	522	y = t->GetX()salpha + t->GetY()calpha;
	523	z = t->GetZ();
	524
	525	printf("tx %f ty %f tz %f Rt = %f R from XY %f\n",x,y,z,TMath::Hypot(x,y),rl);
	526
	527	printf("tpz - tz %f\n",z-t->GetZ());
	528	printf("\n");
	529	hxyt->Fill(x,y);
	530	hxzt->Fill(x,z);
	531
	532	}
	533
	534	rl->LoadTrackRefs();
	535	TTree* treeTR = rl->TreeTR();
	536	b = treeTR->GetBranch("TPC");
	537
	538	TClonesArray* trackrefs = new TClonesArray("AliTrackReference", 100);
	539	AliTrackReference* tref;
	540	b->SetAddress(&trackrefs);
	541
	542	Int_t tlab = TMath::Abs(t->GetLabel());
	543
f237a6b2	544	Int_t netr = (Int_t)treeTR->GetEntries();
f5de2f09	545	printf("Found %d entries in TR tree\n",netr);
	546
	547	for (Int_t e = 0; e < netr; e++)
	548	{
	549	treeTR->GetEntry(e);
	550	tref = (AliTrackReference*)trackrefs->At(0);
	551	if (tref == 0x0) continue;
	552	if (tref->GetTrack() != tlab) continue;
	553
	554	printf("Found %d entries in TR array\n",trackrefs->GetEntries());
	555
	556	for (Int_t i = 0; i < trackrefs->GetEntries(); i++)
	557	{
	558	tref = (AliTrackReference*)trackrefs->At(i);
	559	if (tref->GetTrack() != tlab) continue;
	560	x = tref->X();
	561	y = tref->Y();
	562	z = tref->Z();
	563	printf("Track Ref: x %f y %f z %f\n",tref->X(),tref->Y(),tref->Z());
	564
	565	hxzTR->Fill(x,z);
	566	hxyTR->Fill(x,y);
	567	for (Int_t j = 1; j < 10; j++)
	568	{
	569	hxyTR->Fill(x, y+j*0.1);
	570	hxyTR->Fill(x, y-j*0.1);
	571	hxyTR->Fill(x+j*0.1,y);
	572	hxyTR->Fill(x-j*0.1,y);
	573
	574	hxzTR->Fill(x,z-j*0.1);
	575	hxzTR->Fill(x,z+j*0.1);
	576	hxzTR->Fill(x-j*0.1,z);
	577	hxzTR->Fill(x+j*0.1,z);
	578	}
	579	}
	580	break;
	581	}
	582	hxz->Draw("");
	583	// hxzt->Draw("same");
	584	hxzTR->Draw("same");
	585
	586	delete rl;
	587	}