/**************************************************************************
* 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. *
**************************************************************************/
/* $Id$ */
//_________________________________________________________________________
// RecPoint implementation for PHOS-EMC
// An EmcRecPoint is a cluster of digits
//
//*-- Author: Dmitri Peressounko (RRC KI & SUBATECH)
// --- ROOT system ---
#include "TPad.h"
#include "TH2.h"
#include "TMath.h"
#include "TCanvas.h"
// --- Standard library ---
#include <iostream.h>
// --- AliRoot header files ---
#include "AliGenerator.h"
#include "AliPHOSGeometry.h"
#include "AliPHOSEmcRecPoint.h"
#include "AliRun.h"
ClassImp(AliPHOSEmcRecPoint)
//____________________________________________________________________________
AliPHOSEmcRecPoint::AliPHOSEmcRecPoint() : AliPHOSRecPoint()
{
// ctor
fMulDigit = 0 ;
fAmp = 0. ;
fCoreEnergy = 0 ;
fEnergyList = 0 ;
fGeom = AliPHOSGeometry::GetInstance() ;
fLocPos.SetX(1000000.) ; //Local position should be evaluated
}
//____________________________________________________________________________
AliPHOSEmcRecPoint::~AliPHOSEmcRecPoint()
{
// dtor
if ( fEnergyList )
delete[] fEnergyList ;
}
//____________________________________________________________________________
void AliPHOSEmcRecPoint::AddDigit(AliPHOSDigit & digit, Float_t Energy)
{
// Adds a digit to the RecPoint
// and accumulates the total amplitude and the multiplicity
if(fEnergyList == 0)
fEnergyList = new Float_t[fMaxDigit];
if ( fMulDigit >= fMaxDigit ) { // increase the size of the lists
fMaxDigit*=2 ;
Int_t * tempo = new ( Int_t[fMaxDigit] ) ;
Float_t * tempoE = new ( Float_t[fMaxDigit] ) ;
Int_t index ;
for ( index = 0 ; index < fMulDigit ; index++ ){
tempo[index] = fDigitsList[index] ;
tempoE[index] = fEnergyList[index] ;
}
delete [] fDigitsList ;
fDigitsList = new ( Int_t[fMaxDigit] ) ;
delete [] fEnergyList ;
fEnergyList = new ( Float_t[fMaxDigit] ) ;
for ( index = 0 ; index < fMulDigit ; index++ ){
fDigitsList[index] = tempo[index] ;
fEnergyList[index] = tempoE[index] ;
}
delete [] tempo ;
delete [] tempoE ;
} // if
fDigitsList[fMulDigit] = digit.GetIndexInList() ;
fEnergyList[fMulDigit] = Energy ;
fMulDigit++ ;
fAmp += Energy ;
EvalPHOSMod(&digit) ;
}
//____________________________________________________________________________
Bool_t AliPHOSEmcRecPoint::AreNeighbours(AliPHOSDigit * digit1, AliPHOSDigit * digit2 ) const
{
// Tells if (true) or not (false) two digits are neighbors)
Bool_t aren = kFALSE ;
AliPHOSGeometry * phosgeom = (AliPHOSGeometry *) fGeom ;
Int_t relid1[4] ;
phosgeom->AbsToRelNumbering(digit1->GetId(), relid1) ;
Int_t relid2[4] ;
phosgeom->AbsToRelNumbering(digit2->GetId(), relid2) ;
Int_t rowdiff = TMath::Abs( relid1[2] - relid2[2] ) ;
Int_t coldiff = TMath::Abs( relid1[3] - relid2[3] ) ;
if (( coldiff <= 1 ) && ( rowdiff <= 1 ) && (coldiff + rowdiff > 0))
aren = kTRUE ;
return aren ;
}
//____________________________________________________________________________
Int_t AliPHOSEmcRecPoint::Compare(const TObject * obj) const
{
// Compares two RecPoints according to their position in the PHOS modules
Float_t delta = 1 ; //Width of "Sorting row". If you changibg this
//value (what is senseless) change as vell delta in
//AliPHOSTrackSegmentMakerv* and other RecPoints...
Int_t rv ;
AliPHOSEmcRecPoint * clu = (AliPHOSEmcRecPoint *)obj ;
Int_t phosmod1 = GetPHOSMod() ;
Int_t phosmod2 = clu->GetPHOSMod() ;
TVector3 locpos1;
GetLocalPosition(locpos1) ;
TVector3 locpos2;
clu->GetLocalPosition(locpos2) ;
if(phosmod1 == phosmod2 ) {
Int_t rowdif = (Int_t)TMath::Ceil(locpos1.X()/delta)-(Int_t)TMath::Ceil(locpos2.X()/delta) ;
if (rowdif> 0)
rv = 1 ;
else if(rowdif < 0)
rv = -1 ;
else if(locpos1.Z()>locpos2.Z())
rv = -1 ;
else
rv = 1 ;
}
else {
if(phosmod1 < phosmod2 )
rv = -1 ;
else
rv = 1 ;
}
return rv ;
}
//______________________________________________________________________________
void AliPHOSEmcRecPoint::ExecuteEvent(Int_t event, Int_t px, Int_t py)
{
// Commented by Dmitri Peressounko: there is no possibility to ensure,
// that AliPHOSIndexToObject keeps the correct information.
// // Execute action corresponding to one event
// // This member function is called when a AliPHOSRecPoint is clicked with the locator
// //
// // If Left button is clicked on AliPHOSRecPoint, the digits are switched on
// // and switched off when the mouse button is released.
// //
// // static Int_t pxold, pyold;
// AliPHOSIndexToObject * please = AliPHOSIndexToObject::GetInstance() ;
// static TGraph * digitgraph = 0 ;
// if (!gPad->IsEditable()) return;
// TH2F * histo = 0 ;
// TCanvas * histocanvas ;
// switch (event) {
// case kButton1Down: {
// AliPHOSDigit * digit ;
// AliPHOSGeometry * phosgeom = (AliPHOSGeometry *) fGeom ;
// Int_t iDigit;
// Int_t relid[4] ;
// const Int_t kMulDigit = AliPHOSEmcRecPoint::GetDigitsMultiplicity() ;
// Float_t * xi = new Float_t[kMulDigit] ;
// Float_t * zi = new Float_t[kMulDigit] ;
// // create the histogram for the single cluster
// // 1. gets histogram boundaries
// Float_t ximax = -999. ;
// Float_t zimax = -999. ;
// Float_t ximin = 999. ;
// Float_t zimin = 999. ;
// for(iDigit=0; iDigit<kMulDigit; iDigit++) {
// digit = (AliPHOSDigit *) ( please->GimeDigit(fDigitsList[iDigit]) ) ;
// phosgeom->AbsToRelNumbering(digit->GetId(), relid) ;
// phosgeom->RelPosInModule(relid, xi[iDigit], zi[iDigit]);
// if ( xi[iDigit] > ximax )
// ximax = xi[iDigit] ;
// if ( xi[iDigit] < ximin )
// ximin = xi[iDigit] ;
// if ( zi[iDigit] > zimax )
// zimax = zi[iDigit] ;
// if ( zi[iDigit] < zimin )
// zimin = zi[iDigit] ;
// }
// ximax += phosgeom->GetCrystalSize(0) / 2. ;
// zimax += phosgeom->GetCrystalSize(2) / 2. ;
// ximin -= phosgeom->GetCrystalSize(0) / 2. ;
// zimin -= phosgeom->GetCrystalSize(2) / 2. ;
// Int_t xdim = (int)( (ximax - ximin ) / phosgeom->GetCrystalSize(0) + 0.5 ) ;
// Int_t zdim = (int)( (zimax - zimin ) / phosgeom->GetCrystalSize(2) + 0.5 ) ;
// // 2. gets the histogram title
// Text_t title[100] ;
// sprintf(title,"Energy=%1.2f GeV ; Digits ; %d ", GetEnergy(), GetDigitsMultiplicity()) ;
// if (!histo) {
// delete histo ;
// histo = 0 ;
// }
// histo = new TH2F("cluster3D", title, xdim, ximin, ximax, zdim, zimin, zimax) ;
// Float_t x, z ;
// for(iDigit=0; iDigit<kMulDigit; iDigit++) {
// digit = (AliPHOSDigit *) ( please->GimeDigit(fDigitsList[iDigit]) ) ;
// phosgeom->AbsToRelNumbering(digit->GetId(), relid) ;
// phosgeom->RelPosInModule(relid, x, z);
// histo->Fill(x, z, fEnergyList[iDigit] ) ;
// }
// if (!digitgraph) {
// digitgraph = new TGraph(kMulDigit,xi,zi);
// digitgraph-> SetMarkerStyle(5) ;
// digitgraph-> SetMarkerSize(1.) ;
// digitgraph-> SetMarkerColor(1) ;
// digitgraph-> Paint("P") ;
// }
// Print() ;
// histocanvas = new TCanvas("cluster", "a single cluster", 600, 500) ;
// histocanvas->Draw() ;
// histo->Draw("lego1") ;
// delete[] xi ;
// delete[] zi ;
// break;
// }
// case kButton1Up:
// if (digitgraph) {
// delete digitgraph ;
// digitgraph = 0 ;
// }
// break;
// }
}
//____________________________________________________________________________
void AliPHOSEmcRecPoint::EvalDispersion(Float_t logWeight,TClonesArray * digits)
{
// Calculates the dispersion of the shower at the origine of the RecPoint
Float_t d = 0 ;
Float_t wtot = 0 ;
TVector3 locpos;
GetLocalPosition(locpos);
Float_t x = locpos.X() ;
Float_t z = locpos.Z() ;
AliPHOSDigit * digit ;
AliPHOSGeometry * phosgeom = (AliPHOSGeometry *) fGeom ;
Int_t iDigit;
for(iDigit=0; iDigit < fMulDigit; iDigit++) {
digit = (AliPHOSDigit *) digits->At(fDigitsList[iDigit]) ;
Int_t relid[4] ;
Float_t xi ;
Float_t zi ;
phosgeom->AbsToRelNumbering(digit->GetId(), relid) ;
phosgeom->RelPosInModule(relid, xi, zi);
Float_t w = TMath::Max(0.,logWeight+TMath::Log(fEnergyList[iDigit]/fAmp ) ) ;
d += w*((xi-x)*(xi-x) + (zi-z)*(zi-z) ) ;
wtot+=w ;
}
d /= wtot ;
fDispersion = TMath::Sqrt(d) ;
}
//______________________________________________________________________________
void AliPHOSEmcRecPoint::EvalCoreEnergy(TClonesArray * digits)
{
//This function calculates energy in the core,
//i.e. within radius rad = 3cm. Beyond this radius
//in accoradnce with shower profile energy deposition
// should be less than 2%
Float_t coreRadius = 3 ;
TVector3 locpos;
GetLocalPosition(locpos);
Float_t x = locpos.X() ;
Float_t z = locpos.Z() ;
AliPHOSDigit * digit ;
AliPHOSGeometry * phosgeom = (AliPHOSGeometry *) fGeom ;
Int_t iDigit;
for(iDigit=0; iDigit < fMulDigit; iDigit++) {
digit = (AliPHOSDigit *) ( digits->At(fDigitsList[iDigit]) ) ;
Int_t relid[4] ;
Float_t xi ;
Float_t zi ;
phosgeom->AbsToRelNumbering(digit->GetId(), relid) ;
phosgeom->RelPosInModule(relid, xi, zi);
Float_t distance = TMath::Sqrt((xi-x)*(xi-x)+(zi-z)*(zi-z)) ;
if(distance < coreRadius)
fCoreEnergy += fEnergyList[iDigit] ;
}
}
//____________________________________________________________________________
void AliPHOSEmcRecPoint::EvalElipsAxis(Float_t logWeight,TClonesArray * digits)
{
// Calculates the axis of the shower ellipsoid
Double_t wtot = 0. ;
Double_t x = 0.;
Double_t z = 0.;
Double_t dxx = 0.;
Double_t dzz = 0.;
Double_t dxz = 0.;
AliPHOSDigit * digit ;
AliPHOSGeometry * phosgeom = (AliPHOSGeometry *) fGeom ;
Int_t iDigit;
for(iDigit=0; iDigit<fMulDigit; iDigit++) {
digit = (AliPHOSDigit *) digits->At(fDigitsList[iDigit]) ;
Int_t relid[4] ;
Float_t xi ;
Float_t zi ;
phosgeom->AbsToRelNumbering(digit->GetId(), relid) ;
phosgeom->RelPosInModule(relid, xi, zi);
Double_t w = TMath::Max(0.,logWeight+TMath::Log(fEnergyList[iDigit]/fAmp ) ) ;
dxx += w * xi * xi ;
x += w * xi ;
dzz += w * zi * zi ;
z += w * zi ;
dxz += w * xi * zi ;
wtot += w ;
}
dxx /= wtot ;
x /= wtot ;
dxx -= x * x ;
dzz /= wtot ;
z /= wtot ;
dzz -= z * z ;
dxz /= wtot ;
dxz -= x * z ;
// //Apply correction due to non-perpendicular incidence
// Double_t CosX ;
// Double_t CosZ ;
// Double_t DistanceToIP= (Double_t ) ((AliPHOSGeometry *) fGeom)->GetIPtoCrystalSurface() ;
// CosX = DistanceToIP/TMath::Sqrt(DistanceToIP*DistanceToIP+x*x) ;
// CosZ = DistanceToIP/TMath::Sqrt(DistanceToIP*DistanceToIP+z*z) ;
// dxx = dxx/(CosX*CosX) ;
// dzz = dzz/(CosZ*CosZ) ;
// dxz = dxz/(CosX*CosZ) ;
fLambda[0] = 0.5 * (dxx + dzz) + TMath::Sqrt( 0.25 * (dxx - dzz) * (dxx - dzz) + dxz * dxz ) ;
if(fLambda[0] > 0)
fLambda[0] = TMath::Sqrt(fLambda[0]) ;
fLambda[1] = 0.5 * (dxx + dzz) - TMath::Sqrt( 0.25 * (dxx - dzz) * (dxx - dzz) + dxz * dxz ) ;
if(fLambda[1] > 0) //To avoid exception if numerical errors lead to negative lambda.
fLambda[1] = TMath::Sqrt(fLambda[1]) ;
else
fLambda[1]= 0. ;
}
//____________________________________________________________________________
void AliPHOSEmcRecPoint::EvalAll(Float_t logWeight, TClonesArray * digits )
{
AliPHOSRecPoint::EvalAll(logWeight,digits) ;
EvalLocalPosition(logWeight, digits) ;
EvalElipsAxis(logWeight, digits) ;
EvalDispersion(logWeight, digits) ;
EvalCoreEnergy(digits);
}
//____________________________________________________________________________
void AliPHOSEmcRecPoint::EvalLocalPosition(Float_t logWeight, TClonesArray * digits)
{
// Calculates the center of gravity in the local PHOS-module coordinates
Float_t wtot = 0. ;
Int_t relid[4] ;
Float_t x = 0. ;
Float_t z = 0. ;
AliPHOSDigit * digit ;
AliPHOSGeometry * phosgeom = (AliPHOSGeometry *) fGeom ;
Int_t iDigit;
for(iDigit=0; iDigit<fMulDigit; iDigit++) {
digit = (AliPHOSDigit *) digits->At(fDigitsList[iDigit]) ;
Float_t xi ;
Float_t zi ;
phosgeom->AbsToRelNumbering(digit->GetId(), relid) ;
phosgeom->RelPosInModule(relid, xi, zi);
Float_t w = TMath::Max( 0., logWeight + TMath::Log( fEnergyList[iDigit] / fAmp ) ) ;
x += xi * w ;
z += zi * w ;
wtot += w ;
}
x /= wtot ;
z /= wtot ;
// Correction for the depth of the shower starting point (TDR p 127)
Float_t para = 0.925 ;
Float_t parb = 6.52 ;
Float_t xo,yo,zo ; //Coordinates of the origin
gAlice->Generator()->GetOrigin(xo,yo,zo) ;
Float_t phi = phosgeom->GetPHOSAngle(relid[0]) ;
//Transform to the local ref.frame
Float_t xoL,yoL ;
xoL = xo*TMath::Cos(phi)-yo*TMath::Sin(phi) ;
yoL = xo*TMath::Sin(phi)+yo*TMath::Cos(phi) ;
Float_t radius = TMath::Sqrt((xoL-x)*(xoL-x)+
(phosgeom->GetIPtoCrystalSurface()-yoL)*(phosgeom->GetIPtoCrystalSurface()-yoL)+
(zo-z)*(zo-z));
Float_t incidencephi = TMath::ATan((x-xoL ) / radius) ;
Float_t incidencetheta = TMath::ATan((z-zo) / radius) ;
Float_t depthx = ( para * TMath::Log(fAmp) + parb ) * TMath::Sin(incidencephi) ;
Float_t depthz = ( para * TMath::Log(fAmp) + parb ) * TMath::Sin(incidencetheta) ;
fLocPos.SetX(x - depthx) ;
fLocPos.SetY(0.) ;
fLocPos.SetZ(z - depthz) ;
}
//____________________________________________________________________________
Float_t AliPHOSEmcRecPoint::GetMaximalEnergy(void) const
{
// Finds the maximum energy in the cluster
Float_t menergy = 0. ;
Int_t iDigit;
for(iDigit=0; iDigit<fMulDigit; iDigit++) {
if(fEnergyList[iDigit] > menergy)
menergy = fEnergyList[iDigit] ;
}
return menergy ;
}
//____________________________________________________________________________
Int_t AliPHOSEmcRecPoint::GetMultiplicityAtLevel(const Float_t H) const
{
// Calculates the multiplicity of digits with energy larger than H*energy
Int_t multipl = 0 ;
Int_t iDigit ;
for(iDigit=0; iDigit<fMulDigit; iDigit++) {
if(fEnergyList[iDigit] > H * fAmp)
multipl++ ;
}
return multipl ;
}
//____________________________________________________________________________
Int_t AliPHOSEmcRecPoint::GetNumberOfLocalMax(Int_t * maxAt, Float_t * maxAtEnergy,
Float_t locMaxCut,TClonesArray * digits) const
{
// Calculates the number of local maxima in the cluster using fLocalMaxCut as the minimum
// energy difference between two local maxima
AliPHOSDigit * digit ;
AliPHOSDigit * digitN ;
Int_t iDigitN ;
Int_t iDigit ;
for(iDigit = 0; iDigit < fMulDigit; iDigit++)
maxAt[iDigit] = (Int_t) digits->At(fDigitsList[iDigit]) ;
for(iDigit = 0 ; iDigit < fMulDigit; iDigit++) {
if(maxAt[iDigit] != -1) {
digit = (AliPHOSDigit *) maxAt[iDigit] ;
for(iDigitN = 0; iDigitN < fMulDigit; iDigitN++) {
digitN = (AliPHOSDigit *) digits->At(fDigitsList[iDigitN]) ;
if ( AreNeighbours(digit, digitN) ) {
if (fEnergyList[iDigit] > fEnergyList[iDigitN] ) {
maxAt[iDigitN] = -1 ;
// but may be digit too is not local max ?
if(fEnergyList[iDigit] < fEnergyList[iDigitN] + locMaxCut)
maxAt[iDigit] = -1 ;
}
else {
maxAt[iDigit] = -1 ;
// but may be digitN too is not local max ?
if(fEnergyList[iDigit] > fEnergyList[iDigitN] - locMaxCut)
maxAt[iDigitN] = -1 ;
}
} // if Areneighbours
} // while digitN
} // slot not empty
} // while digit
iDigitN = 0 ;
for(iDigit = 0; iDigit < fMulDigit; iDigit++) {
if(maxAt[iDigit] != -1){
maxAt[iDigitN] = maxAt[iDigit] ;
maxAtEnergy[iDigitN] = fEnergyList[iDigit] ;
iDigitN++ ;
}
}
return iDigitN ;
}
//____________________________________________________________________________
void AliPHOSEmcRecPoint::Print(Option_t * option)
{
// Print the list of digits belonging to the cluster
cout << "AliPHOSEmcRecPoint: " << endl ;
Int_t iDigit;
cout << " digits # = " ;
for(iDigit=0; iDigit<fMulDigit; iDigit++)
cout << fDigitsList[iDigit] << " " ;
cout << endl ;
cout << " Energies = " ;
for(iDigit=0; iDigit<fMulDigit; iDigit++)
cout << fEnergyList[iDigit] << " ";
cout << endl ;
cout << " Multiplicity = " << fMulDigit << endl ;
cout << " Cluster Energy = " << fAmp << endl ;
cout << " Stored at position " << GetIndexInList() << endl ;
}
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