* period of March - June 2001 *
**************************************************************************/
-
#include <iostream.h>
#include <TArrayI.h>
#include "AliRun.h"
//____________________________________________________________________
//
// Constructor
-//____________________________________________________________________
-//
-
-
-AliITSClusterFinderSSD::AliITSClusterFinderSSD(AliITSsegmentation *seg, TClonesArray *digits)
-{
-//Standard constructor
-
- fSegmentation=seg;
- fDigits=digits;
-
- fMap = new AliITSMapA1(fSegmentation,fDigits);
-
- fITS=(AliITS*)gAlice->GetModule("ITS");
-
- fClusterP = new TClonesArray ("AliITSclusterSSD",200);
- fNClusterP =0;
-
- fClusterN= new TClonesArray ("AliITSclusterSSD",200);
- fNClusterN =0;
-
- fPackages = new TClonesArray ("AliITSpackageSSD",200); //packages
- fNPackages = 0;
-
-
- fDigitsIndexP = new TArrayI(300);
- fNDigitsP = 0;
-
- fDigitsIndexN = new TArrayI(300);
- fNDigitsN = 0;
-
- fPitch = fSegmentation->Dpx(0);
- fPNsignalRatio=7./8.; // warning: hard-wired number
-
+//______________________________________________________________________
+AliITSClusterFinderSSD::AliITSClusterFinderSSD(){
+ //Default constructor
+
+ fSegmentation = 0;
+ fDigits = 0;
+ fMap = 0;
+ fITS = (AliITS*)gAlice->GetModule("ITS");
+ fClusterP = 0;
+ fNClusterP =0;
+ fClusterN = 0;
+ fNClusterN = 0;
+ fPackages = 0;
+ fNPackages = 0;
+ fDigitsIndexP = 0;
+ fNDigitsP = 0;
+ fDigitsIndexN = 0;
+ fNDigitsN = 0;
+ fPitch = 0;
+ fPNsignalRatio= 0;
}
-
-//-------------------------------------------------------
-AliITSClusterFinderSSD::~AliITSClusterFinderSSD() {
-// Default destructor
+//______________________________________________________________________}
+AliITSClusterFinderSSD::AliITSClusterFinderSSD(AliITSsegmentation *seg,
+ TClonesArray *digits){
+ //Standard constructor
+
+ fSegmentation = seg;
+ fDigits = digits;
+ fMap = new AliITSMapA1(fSegmentation,fDigits);
+ fITS = (AliITS*)gAlice->GetModule("ITS");
+ fClusterP = new TClonesArray ("AliITSclusterSSD",200);
+ fNClusterP = 0;
+ fClusterN = new TClonesArray ("AliITSclusterSSD",200);
+ fNClusterN = 0;
+ fPackages = new TClonesArray ("AliITSpackageSSD",200); //packages
+ fNPackages = 0;
+ fDigitsIndexP = new TArrayI(300);
+ fNDigitsP = 0;
+ fDigitsIndexN = new TArrayI(300);
+ fNDigitsN = 0;
+ fPitch = fSegmentation->Dpx(0);
+ fPNsignalRatio= 7./8.; // warning: hard-wired number
+}
+//______________________________________________________________________
+AliITSClusterFinderSSD::~AliITSClusterFinderSSD(){
+ // Default destructor
delete fClusterP;
delete fClusterN;
delete fDigitsIndexP;
delete fDigitsIndexN;
delete fMap;
-
}
+//______________________________________________________________________
+void AliITSClusterFinderSSD::InitReconstruction(){
+ // initialization of the cluster finder
-//-------------------------------------------------------
-void AliITSClusterFinderSSD::InitReconstruction()
-{
-// initialization of the cluster finder
-
- register Int_t i; //iterator
-
- for (i=0;i<fNClusterP;i++)
- {
- fClusterP->RemoveAt(i);
- }
- fNClusterP =0;
- for (i=0;i<fNClusterN;i++)
- {
- fClusterN->RemoveAt(i);
- }
- fNClusterN=0;
-
- for (i=0;i<fNPackages;i++)
- {
- fPackages->RemoveAt(i);
- }
-
- fNPackages = 0;
- fNDigitsP=0;
- fNDigitsN=0;
+ register Int_t i; //iterator
- Float_t StereoP,StereoN;
- fSegmentation->Angles(StereoP,StereoN);
-
- CalcStepFactor (StereoP,StereoN);
-
- if (debug) cout<<"fSFF = "<<fSFF<<" fSFB = "<<fSFB<<"\n";
+ for (i=0;i<fNClusterP;i++) fClusterP->RemoveAt(i);
+ fNClusterP =0;
+ for (i=0;i<fNClusterN;i++) fClusterN->RemoveAt(i);
+ fNClusterN=0;
+ for (i=0;i<fNPackages;i++) fPackages->RemoveAt(i);
+ fNPackages = 0;
+ fNDigitsP = 0;
+ fNDigitsN = 0;
+ Float_t StereoP,StereoN;
+ fSegmentation->Angles(StereoP,StereoN);
+ CalcStepFactor(StereoP,StereoN);
+ if (debug) cout<<"fSFF = "<<fSFF<<" fSFB = "<<fSFB<<"\n";
}
-
-
-//---------------------------------------------
-void AliITSClusterFinderSSD::FindRawClusters(Int_t module)
-{
-// This function findes out all clusters belonging to one module
-// 1. Zeroes all space after previous module reconstruction
-// 2. Finds all neighbouring digits, create clusters
-// 3. If necesery, resolves for each group of neighbouring digits
-// how many clusters creates it.
-// 4. Colculate the x and z coordinate
- Int_t lay, lad, detect;
- AliITS *aliITS = (AliITS*)gAlice->GetModule("ITS");
- AliITSgeom *geom = aliITS->GetITSgeom();
-
- geom->GetModuleId(module,lay, lad, detect);
-
- //cout<<"FindRawCl: layer,module ="<<lay<<","<<module<<endl;
-
- if ( lay == 6 )
- ((AliITSsegmentationSSD*)fSegmentation)->SetLayer(6);
- if ( lay == 5 )
- ((AliITSsegmentationSSD*)fSegmentation)->SetLayer(5);
-
- InitReconstruction(); //ad. 1
- fMap->FillMap();
- FillDigitsIndex();
- SortDigits();
- FindNeighbouringDigits(); //ad. 2
- //SeparateOverlappedClusters(); //ad. 3
- ClustersToPackages(); //ad. 4
- fMap->ClearMap();
+//______________________________________________________________________
+void AliITSClusterFinderSSD::FindRawClusters(Int_t module){
+ // This function findes out all clusters belonging to one module
+ // 1. Zeroes all space after previous module reconstruction
+ // 2. Finds all neighbouring digits, create clusters
+ // 3. If necesery, resolves for each group of neighbouring digits
+ // how many clusters creates it.
+ // 4. Colculate the x and z coordinate
+ Int_t lay, lad, detect;
+ AliITSgeom *geom = fITS->GetITSgeom();
+
+ geom->GetModuleId(module,lay, lad, detect);
+ if ( lay == 6 ) ((AliITSsegmentationSSD*)fSegmentation)->SetLayer(6);
+ if ( lay == 5 ) ((AliITSsegmentationSSD*)fSegmentation)->SetLayer(5);
+
+ InitReconstruction(); //ad. 1
+ fMap->FillMap();
+ FillDigitsIndex();
+ SortDigits();
+ FindNeighbouringDigits(); //ad. 2
+ //SeparateOverlappedClusters(); //ad. 3
+ ClustersToPackages(); //ad. 4
+ fMap->ClearMap();
}
-
-
-//-------------------------------------------------
-void AliITSClusterFinderSSD::FindNeighbouringDigits()
-{
-//If there are any digits on this side, create 1st Cluster,
-// add to it this digit, and increment number of clusters
-
-
- register Int_t i;
-
-
- if ((fNDigitsP>0 ) && (fNDigitsN > 0 )) {
-
- Int_t currentstripNo;
- Int_t *dbuffer = new Int_t [300]; //buffer for strip numbers
- Int_t dnumber; //curent number of digits in buffer
- TArrayI &lDigitsIndexP = *fDigitsIndexP;
- TArrayI &lDigitsIndexN = *fDigitsIndexN;
- TObjArray &lDigits = *(Digits());
- TClonesArray &lClusterP = *fClusterP;
- TClonesArray &lClusterN = *fClusterN;
-
- //process P side
- dnumber = 1;
- dbuffer[0]=lDigitsIndexP[0];
- //If next digit is a neighbour of previous, adds to last cluster this digit
- for (i=1; i<fNDigitsP; i++) {
- //reads new digit
- currentstripNo = ((AliITSdigitSSD*)lDigits[lDigitsIndexP[i]])->
- GetStripNumber();
- //check if it is a neighbour of a previous one
- if ( (((AliITSdigitSSD*)lDigits[lDigitsIndexP[i-1]])->GetStripNumber())
- == (currentstripNo-1) ) dbuffer[dnumber++]=lDigitsIndexP[i];
- else {
- //create a new one side cluster
- new(lClusterP[fNClusterP++]) AliITSclusterSSD(dnumber,dbuffer,Digits(),fgkSIDEP);
- dbuffer[0]=lDigitsIndexP[i];
- dnumber = 1;
- }
- } // end loop over fNDigitsP
- new(lClusterP[fNClusterP++]) AliITSclusterSSD(dnumber,dbuffer,Digits(),fgkSIDEP);
-
-
- //process N side
- //for comments, see above
- dnumber = 1;
- dbuffer[0]=lDigitsIndexN[0];
- //If next digit is a neighbour of previous, adds to last cluster this digit
- for (i=1; i<fNDigitsN; i++) {
- currentstripNo = ((AliITSdigitSSD*)(lDigits[lDigitsIndexN[i]]))->
+//______________________________________________________________________
+void AliITSClusterFinderSSD::FindNeighbouringDigits(){
+ //If there are any digits on this side, create 1st Cluster,
+ // add to it this digit, and increment number of clusters
+ register Int_t i;
+
+ if ((fNDigitsP>0 ) && (fNDigitsN > 0 )) {
+ Int_t currentstripNo;
+ Int_t *dbuffer = new Int_t [300]; //buffer for strip numbers
+ Int_t dnumber; //curent number of digits in buffer
+ TArrayI &lDigitsIndexP = *fDigitsIndexP;
+ TArrayI &lDigitsIndexN = *fDigitsIndexN;
+ TObjArray &lDigits = *(Digits());
+ TClonesArray &lClusterP = *fClusterP;
+ TClonesArray &lClusterN = *fClusterN;
+ //process P side
+ dnumber = 1;
+ dbuffer[0]=lDigitsIndexP[0];
+ //If next digit is a neigh. of previous, adds to last clust. this digit
+ for (i=1; i<fNDigitsP; i++) {
+ //reads new digit
+ currentstripNo = ((AliITSdigitSSD*)lDigits[lDigitsIndexP[i]])->
+ GetStripNumber();
+ //check if it is a neighbour of a previous one
+ if((((AliITSdigitSSD*)lDigits[lDigitsIndexP[i-1]])->
+ GetStripNumber())
+ == (currentstripNo-1) ) dbuffer[dnumber++]=lDigitsIndexP[i];
+ else{
+ //create a new one side cluster
+ new(lClusterP[fNClusterP++]) AliITSclusterSSD(dnumber,dbuffer,
+ Digits(),
+ fgkSIDEP);
+ dbuffer[0]=lDigitsIndexP[i];
+ dnumber = 1;
+ } // end if else
+ } // end loop over fNDigitsP
+ new(lClusterP[fNClusterP++]) AliITSclusterSSD(dnumber,dbuffer,
+ Digits(),fgkSIDEP);
+ //process N side
+ //for comments, see above
+ dnumber = 1;
+ dbuffer[0]=lDigitsIndexN[0];
+ //If next digit is a neigh. of previous, adds to last clust. this digit
+ for (i=1; i<fNDigitsN; i++) {
+ currentstripNo = ((AliITSdigitSSD*)(lDigits[lDigitsIndexN[i]]))->
GetStripNumber();
- if ( (((AliITSdigitSSD*)lDigits[lDigitsIndexN[i-1]])->GetStripNumber())
- == (currentstripNo-1) ) dbuffer[dnumber++]=lDigitsIndexN[i];
- else {
- new(lClusterN[fNClusterN++]) AliITSclusterSSD(dnumber,dbuffer,Digits(),fgkSIDEN);
- dbuffer[0]=lDigitsIndexN[i];
- dnumber = 1;
- }
- } // end loop over fNDigitsN
- new(lClusterN[fNClusterN++]) AliITSclusterSSD(dnumber,dbuffer,Digits(),fgkSIDEN);
- delete [] dbuffer;
-
- } // end condition on NDigits
-
- if (debug) cout<<"\n Found clusters: fNClusterP = "<<fNClusterP<<" fNClusterN ="<<fNClusterN<<"\n";
-
-}
-
-//--------------------------------------------------------------
-
-void AliITSClusterFinderSSD::SeparateOverlappedClusters()
-{
-// overlapped clusters separation
-
- register Int_t i; //iterator
-
- Float_t factor=0.75; // How many percent must be lower signal
- // on the middle one digit
- // from its neighbours
- Int_t signal0; //signal on the strip before the current one
- Int_t signal1; //signal on the current one signal
- Int_t signal2; //signal on the strip after the current one
- TArrayI *splitlist; // List of splits
- Int_t numerofsplits=0; // number of splits
- Int_t initPsize = fNClusterP; //initial size of the arrays
- Int_t initNsize = fNClusterN; //we have to keep it because it will grow
- // in this function and it doasn't make
- // sense to pass through it again
-
- splitlist = new TArrayI(300);
-
- for (i=0;i<initPsize;i++)
- {
- if (( ((AliITSclusterSSD*)(*fClusterP)[i])->GetNumOfDigits())==1) continue;
- if (( ((AliITSclusterSSD*)(*fClusterP)[i])->GetNumOfDigits())==2) continue;
+ if ( (((AliITSdigitSSD*)lDigits[lDigitsIndexN[i-1]])->
+ GetStripNumber())
+ == (currentstripNo-1) ) dbuffer[dnumber++]=lDigitsIndexN[i];
+ else {
+ new(lClusterN[fNClusterN++]) AliITSclusterSSD(dnumber,dbuffer,
+ Digits(),
+ fgkSIDEN);
+ dbuffer[0]=lDigitsIndexN[i];
+ dnumber = 1;
+ } // end if else
+ } // end loop over fNDigitsN
+ new(lClusterN[fNClusterN++]) AliITSclusterSSD(dnumber,dbuffer,
+ Digits(),fgkSIDEN);
+ delete [] dbuffer;
+
+ } // end condition on NDigits
+
+ if (debug) cout<<"\n Found clusters: fNClusterP = "<<fNClusterP
+ <<" fNClusterN ="<<fNClusterN<<"\n";
+}
+//______________________________________________________________________
+void AliITSClusterFinderSSD::SeparateOverlappedClusters(){
+ // overlapped clusters separation
+ register Int_t i; //iterator
+ Float_t factor=0.75; // How many percent must be lower signal
+ // on the middle one digit
+ // from its neighbours
+ Int_t signal0; //signal on the strip before the current one
+ Int_t signal1; //signal on the current one signal
+ Int_t signal2; //signal on the strip after the current one
+ TArrayI *splitlist; // List of splits
+ Int_t numerofsplits=0; // number of splits
+ Int_t initPsize = fNClusterP; //initial size of the arrays
+ Int_t initNsize = fNClusterN; //we have to keep it because it will grow
+ // in this function and it doasn't make
+ // sense to pass through it again
+ splitlist = new TArrayI(300);
+
+ for (i=0;i<initPsize;i++){
+ if (( ((AliITSclusterSSD*)(*fClusterP)[i])->
+ GetNumOfDigits())==1) continue;
+ if (( ((AliITSclusterSSD*)(*fClusterP)[i])->
+ GetNumOfDigits())==2) continue;
Int_t nj=(((AliITSclusterSSD*)(*fClusterP)[i])->GetNumOfDigits()-1);
- for (Int_t j=1; j<nj; j++)
- {
+ for (Int_t j=1; j<nj; j++){
signal1=((AliITSclusterSSD*)(*fClusterP)[i])->GetDigitSignal(j);
signal0=((AliITSclusterSSD*)(*fClusterP)[i])->GetDigitSignal(j-1);
signal2=((AliITSclusterSSD*)(*fClusterP)[i])->GetDigitSignal(j+1);
//if signal is less then factor*signal of its neighbours
- if ( (signal1<(factor*signal0)) && (signal1<(factor*signal2)) )
- {
- (*splitlist)[numerofsplits++]=j;
- }
- } // end loop over number of digits
- //split this cluster if necessary
- if(numerofsplits>0) SplitCluster(splitlist,numerofsplits,i,fgkSIDEP);
- numerofsplits=0;
-
- //in signed places (splitlist)
- } // end loop over clusters on Pside
-
- for (i=0;i<initNsize;i++) {
- if (( ((AliITSclusterSSD*)(*fClusterN)[i])->GetNumOfDigits())==1) continue;
- if (( ((AliITSclusterSSD*)(*fClusterN)[i])->GetNumOfDigits())==2) continue;
- Int_t nj=(((AliITSclusterSSD*)(*fClusterN)[i])->GetNumOfDigits()-1);
- for (Int_t j=1; j<nj; j++)
- {
+ if ( (signal1<(factor*signal0)) && (signal1<(factor*signal2)) ){
+ (*splitlist)[numerofsplits++]=j;
+ } // end if
+ } // end loop over number of digits
+ //split this cluster if necessary
+ if(numerofsplits>0) SplitCluster(splitlist,numerofsplits,i,fgkSIDEP);
+ numerofsplits=0;
+ //in signed places (splitlist)
+ } // end loop over clusters on Pside
+
+ for (i=0;i<initNsize;i++) {
+ if (( ((AliITSclusterSSD*)(*fClusterN)[i])->
+ GetNumOfDigits())==1) continue;
+ if (( ((AliITSclusterSSD*)(*fClusterN)[i])->
+ GetNumOfDigits())==2) continue;
+ Int_t nj=(((AliITSclusterSSD*)(*fClusterN)[i])->GetNumOfDigits()-1);
+ for (Int_t j=1; j<nj; j++){
signal1=((AliITSclusterSSD*)(*fClusterN)[i])->GetDigitSignal(j);
signal0=((AliITSclusterSSD*)(*fClusterN)[i])->GetDigitSignal(j-1);
signal2=((AliITSclusterSSD*)(*fClusterN)[i])->GetDigitSignal(j+1);
//if signal is less then factor*signal of its neighbours
if ( (signal1<(factor*signal0)) && (signal1<(factor*signal2)) )
- (*splitlist)[numerofsplits++]=j;
- } // end loop over number of digits
- //split this cluster into more clusters
- if(numerofsplits>0) SplitCluster(splitlist,numerofsplits,i,fgkSIDEN);
- numerofsplits=0; //in signed places (splitlist)
- } // end loop over clusters on Nside
-
- delete splitlist;
+ (*splitlist)[numerofsplits++]=j;
+ } // end loop over number of digits
+ //split this cluster into more clusters
+ if(numerofsplits>0) SplitCluster(splitlist,numerofsplits,i,fgkSIDEN);
+ numerofsplits=0;
+ //in signed places (splitlist)
+ } // end loop over clusters on Nside
+
+ delete splitlist;
}
-
-//-------------------------------------------------------
-void AliITSClusterFinderSSD::SplitCluster(TArrayI *list, Int_t nsplits, Int_t index, Bool_t side)
-{
- //This function splits one side cluster into more clusters
- //number of splits is defined by "nsplits"
- //Place of splits are defined in the TArray "list"
-
- // For further optimisation: Replace this function by two
- // specialised ones (each for one side)
- // save one "if"
-
- //For comlete comments see AliITSclusterSSD::SplitCluster
-
-
- register Int_t i; //iterator
-
- AliITSclusterSSD* curentcluster;
- Int_t *tmpdigits = new Int_t[100];
- Int_t NN;
- // side true means P side
- if (side) {
- curentcluster =((AliITSclusterSSD*)((*fClusterP)[index])) ;
- for (i = nsplits; i>0 ;i--) {
- NN=curentcluster->SplitCluster((*list)[(i-1)],tmpdigits);
- new ((*fClusterP)[fNClusterP]) AliITSclusterSSD(NN,tmpdigits,Digits(),side);
- ( (AliITSclusterSSD*)((*fClusterP)[fNClusterP]) )->
+//______________________________________________________________________
+void AliITSClusterFinderSSD::SplitCluster(TArrayI *list, Int_t nsplits,
+ Int_t index, Bool_t side){
+ //This function splits one side cluster into more clusters
+ //number of splits is defined by "nsplits"
+ //Place of splits are defined in the TArray "list"
+ // For further optimisation: Replace this function by two
+ // specialised ones (each for one side)
+ // save one "if"
+ //For comlete comments see AliITSclusterSSD::SplitCluster
+ register Int_t i; //iterator
+ AliITSclusterSSD* curentcluster;
+ Int_t *tmpdigits = new Int_t[100];
+ Int_t NN;
+
+ // side true means P side
+ if (side) {
+ curentcluster =((AliITSclusterSSD*)((*fClusterP)[index])) ;
+ for (i = nsplits; i>0 ;i--) {
+ NN=curentcluster->SplitCluster((*list)[(i-1)],tmpdigits);
+ new ((*fClusterP)[fNClusterP]) AliITSclusterSSD(NN,tmpdigits,
+ Digits(),side);
+ ( (AliITSclusterSSD*)((*fClusterP)[fNClusterP]) )->
SetLeftNeighbour(kTRUE);
- //if left cluster had neighbour on the right before split
- //new should have it too
- if ( curentcluster->GetRightNeighbour() )
- ( (AliITSclusterSSD*)((*fClusterP)[fNClusterP]) )->
+ //if left cluster had neighbour on the right before split
+ //new should have it too
+ if ( curentcluster->GetRightNeighbour() )
+ ( (AliITSclusterSSD*)((*fClusterP)[fNClusterP]) )->
SetRightNeighbour(kTRUE);
- else curentcluster->SetRightNeighbour(kTRUE);
- fNClusterP++;
- } // end loop over nplits
- } else {
- curentcluster =((AliITSclusterSSD*)((*fClusterN)[index]));
- for (i = nsplits; i>0 ;i--) {
- NN=curentcluster->SplitCluster((*list)[(i-1)],tmpdigits);
- new ((*fClusterN)[fNClusterN]) AliITSclusterSSD(NN,tmpdigits,Digits(),side);
- ((AliITSclusterSSD*)((*fClusterN)[fNClusterN]))->
+ else curentcluster->SetRightNeighbour(kTRUE);
+ fNClusterP++;
+ } // end loop over nplits
+ } else {
+ curentcluster =((AliITSclusterSSD*)((*fClusterN)[index]));
+ for (i = nsplits; i>0 ;i--) {
+ NN=curentcluster->SplitCluster((*list)[(i-1)],tmpdigits);
+ new ((*fClusterN)[fNClusterN]) AliITSclusterSSD(NN,tmpdigits,
+ Digits(),side);
+ ((AliITSclusterSSD*)((*fClusterN)[fNClusterN]))->
SetRightNeighbour(kTRUE);
- if (curentcluster->GetRightNeighbour())
- ( (AliITSclusterSSD*)( (*fClusterN)[fNClusterN]) )->
+ if (curentcluster->GetRightNeighbour())
+ ( (AliITSclusterSSD*)( (*fClusterN)[fNClusterN]) )->
SetRightNeighbour(kTRUE);
- else curentcluster->SetRightNeighbour(kTRUE);
- fNClusterN++;
- } // end loop over nplits
- } // end if side
- delete []tmpdigits;
-
+ else curentcluster->SetRightNeighbour(kTRUE);
+ fNClusterN++;
+ } // end loop over nplits
+ } // end if side
+ delete []tmpdigits;
}
-
-
-//-------------------------------------------------
-Int_t AliITSClusterFinderSSD::SortDigitsP(Int_t start, Int_t end)
-{
-// sort digits on the P side
-
-
- Int_t right;
- Int_t left;
- if (start != (end - 1) )
- {
- left=this->SortDigitsP(start,(start+end)/2);
- right=this->SortDigitsP((start+end)/2,end);
- return (left || right);
- }
- else
- {
- left = ((AliITSdigitSSD*)((*(Digits()))[(*fDigitsIndexP)[start]]))->GetStripNumber();
- right= ((AliITSdigitSSD*)((*(Digits()))[(*fDigitsIndexP)[end]]))->GetStripNumber();
- if( left > right )
- {
- Int_t tmp = (*fDigitsIndexP)[start];
- (*fDigitsIndexP)[start]=(*fDigitsIndexP)[end];
- (*fDigitsIndexP)[end]=tmp;
- return 1;
- }
- else return 0;
- }
+//______________________________________________________________________
+Int_t AliITSClusterFinderSSD::SortDigitsP(Int_t start, Int_t end){
+ // sort digits on the P side
+ Int_t right;
+ Int_t left;
+
+ if (start != (end - 1) ){
+ left=this->SortDigitsP(start,(start+end)/2);
+ right=this->SortDigitsP((start+end)/2,end);
+ return (left || right);
+ }else{
+ left = ((AliITSdigitSSD*)((*(Digits()))[(*fDigitsIndexP)[start]]))->
+ GetStripNumber();
+ right= ((AliITSdigitSSD*)((*(Digits()))[(*fDigitsIndexP)[end]]))->
+ GetStripNumber();
+ if( left > right ){
+ Int_t tmp = (*fDigitsIndexP)[start];
+ (*fDigitsIndexP)[start]=(*fDigitsIndexP)[end];
+ (*fDigitsIndexP)[end]=tmp;
+ return 1;
+ }else return 0;
+ } // end if
}
-
-
-//--------------------------------------------------
-
-Int_t AliITSClusterFinderSSD::SortDigitsN(Int_t start, Int_t end)
-{
-// sort digits on the N side
-
- Int_t right;
- Int_t left;
- if (start != (end - 1))
- {
- left=this->SortDigitsN(start,(start+end)/2);
- right=this->SortDigitsN((start+end)/2,end);
- return (left || right);
- }
- else
- {
- left =((AliITSdigitSSD*)((*(Digits()))[(*fDigitsIndexN)[start]]))->GetStripNumber();
- right=((AliITSdigitSSD*)((*(Digits()))[(*fDigitsIndexN)[end]]))->GetStripNumber();
- if ( left > right )
- {
- Int_t tmp = (*fDigitsIndexN)[start];
- (*fDigitsIndexN)[start]=(*fDigitsIndexN)[end];
- (*fDigitsIndexN)[end]=tmp;
- return 1;
- }else return 0;
- }
+//______________________________________________________________________
+Int_t AliITSClusterFinderSSD::SortDigitsN(Int_t start, Int_t end){
+ // sort digits on the N side
+ Int_t right;
+ Int_t left;
+
+ if (start != (end - 1)){
+ left=this->SortDigitsN(start,(start+end)/2);
+ right=this->SortDigitsN((start+end)/2,end);
+ return (left || right);
+ }else{
+ left =((AliITSdigitSSD*)((*(Digits()))[(*fDigitsIndexN)[start]]))->
+ GetStripNumber();
+ right=((AliITSdigitSSD*)((*(Digits()))[(*fDigitsIndexN)[end]]))->
+ GetStripNumber();
+ if ( left > right ){
+ Int_t tmp = (*fDigitsIndexN)[start];
+ (*fDigitsIndexN)[start]=(*fDigitsIndexN)[end];
+ (*fDigitsIndexN)[end]=tmp;
+ return 1;
+ }else return 0;
+ } // end if
}
-
-
-//------------------------------------------------
-void AliITSClusterFinderSSD::FillDigitsIndex()
-{
- //Fill the indexes of the clusters belonging to a given ITS module
-
- Int_t PNs=0, NNs=0;
- Int_t tmp,bit,k;
- Int_t N;
- Int_t i;
-
- N = fDigits->GetEntriesFast();
-
- Int_t* PSidx = new Int_t [N*sizeof(Int_t)];
- Int_t* NSidx = new Int_t [N*sizeof(Int_t)];
- if (fDigitsIndexP==NULL) fDigitsIndexP = new TArrayI(N);
- if (fDigitsIndexN==NULL) fDigitsIndexN = new TArrayI(N);
-
- AliITSdigitSSD *dig;
-
- for ( i = 0 ; i< N; i++ ) {
- dig = (AliITSdigitSSD*)GetDigit(i);
- if(dig->IsSideP()) {
- bit=1;
- tmp=dig->GetStripNumber();
- // I find this totally unnecessary - it's just a
- // CPU consuming double check
- for( k=0;k<PNs;k++)
- {
- if (tmp==PSidx[k])
- {
- if (debug) cout<<"Such a digit exists \n";
- bit=0;
- }
- }
- // end comment
- if(bit) {
- fDigitsIndexP->AddAt(i,fNDigitsP++);
- PSidx[PNs++]=tmp;
- }
- } else {
- bit=1;
- tmp=dig->GetStripNumber();
- // same as above
- for( k=0;k<NNs;k++)
- {
- if (tmp==NSidx[k])
- {
- if (debug) cout<<"Such a digit exists \n";
- bit=0;
- }
- }
- // end comment
- if (bit) {
- fDigitsIndexN->AddAt(i,fNDigitsN++);
- NSidx[NNs++] =tmp;
- }
- }
- }
-
- delete [] PSidx;
- delete [] NSidx;
-
- if (debug) cout<<"Digits : P = "<<fNDigitsP<<" N = "<<fNDigitsN<<endl;
-
+//______________________________________________________________________
+void AliITSClusterFinderSSD::FillDigitsIndex(){
+ //Fill the indexes of the clusters belonging to a given ITS module
+ Int_t PNs=0, NNs=0;
+ Int_t tmp,bit,k;
+ Int_t N;
+ Int_t i;
+
+ N = fDigits->GetEntriesFast();
+
+ Int_t* PSidx = new Int_t [N*sizeof(Int_t)];
+ Int_t* NSidx = new Int_t [N*sizeof(Int_t)];
+ if (fDigitsIndexP==NULL) fDigitsIndexP = new TArrayI(N);
+ if (fDigitsIndexN==NULL) fDigitsIndexN = new TArrayI(N);
+
+ AliITSdigitSSD *dig;
+
+ for ( i = 0 ; i< N; i++ ) {
+ dig = (AliITSdigitSSD*)GetDigit(i);
+ if(dig->IsSideP()) {
+ bit=1;
+ tmp=dig->GetStripNumber();
+ // I find this totally unnecessary - it's just a
+ // CPU consuming double check
+ for( k=0;k<PNs;k++){
+ if (tmp==PSidx[k]){
+ if (debug) cout<<"Such a digit exists \n";
+ bit=0;
+ } // end if
+ } // end for k
+ // end comment
+ if(bit) {
+ fDigitsIndexP->AddAt(i,fNDigitsP++);
+ PSidx[PNs++]=tmp;
+ } // end if bit
+ } else {
+ bit=1;
+ tmp=dig->GetStripNumber();
+ // same as above
+ for( k=0;k<NNs;k++){
+ if (tmp==NSidx[k]){
+ if (debug) cout<<"Such a digit exists \n";
+ bit=0;
+ } // end if
+ } // for k
+ // end comment
+ if (bit) {
+ fDigitsIndexN->AddAt(i,fNDigitsN++);
+ NSidx[NNs++] =tmp;
+ } // end if bit
+ } // end if
+ } // end for i
+
+ delete [] PSidx;
+ delete [] NSidx;
+
+ if (debug) cout<<"Digits : P = "<<fNDigitsP<<" N = "<<fNDigitsN<<endl;
}
-
-
-//-------------------------------------------
-
-void AliITSClusterFinderSSD::SortDigits()
-{
-// sort digits
-
- Int_t i;
- if(fNDigitsP>1)
- for (i=0;i<fNDigitsP-1;i++)
- if (SortDigitsP(0,(fNDigitsP-1-i))==0) break;
-
- if(fNDigitsN>1)
- for (i=0;i<fNDigitsN-1;i++)
- if(SortDigitsN(0,(fNDigitsN-1-i))==0) break;
+//______________________________________________________________________
+void AliITSClusterFinderSSD::SortDigits(){
+ // sort digits
+ Int_t i;
+
+ if(fNDigitsP>1) for (i=0;i<fNDigitsP-1;i++)
+ if (SortDigitsP(0,(fNDigitsP-1-i))==0) break;
+ if(fNDigitsN>1) for (i=0;i<fNDigitsN-1;i++)
+ if(SortDigitsN(0,(fNDigitsN-1-i))==0) break;
}
+//______________________________________________________________________
+void AliITSClusterFinderSSD::FillClIndexArrays(Int_t* arrayP, Int_t *arrayN){
+ // fill cluster index array
+ register Int_t i;
-
-
-//----------------------------------------------
-void AliITSClusterFinderSSD::FillClIndexArrays(Int_t* arrayP, Int_t *arrayN)
-{
-// fill cluster index array
-
- register Int_t i;
- for (i=0; i<fNClusterP;i++)
- {
- arrayP[i]=i;
- }
- for (i=0; i<fNClusterN;i++)
- {
- arrayN[i]=i;
- }
+ for (i=0; i<fNClusterP;i++) arrayP[i]=i;
+ for (i=0; i<fNClusterN;i++) arrayN[i]=i;
}
-
-
-//------------------------------------------------------
-void AliITSClusterFinderSSD::SortClusters(Int_t* arrayP, Int_t *arrayN)
-{
-// sort clusters
-
- Int_t i;
- if(fNClusterP>1)
- for (i=0;i<fNClusterP-1;i++)
- if (SortClustersP(0,(fNClusterP-1),arrayP)==0) break;
-
-
- if(fNClusterN>1)
- for (i=0;i<fNClusterN-1;i++)
+//______________________________________________________________________
+void AliITSClusterFinderSSD::SortClusters(Int_t* arrayP, Int_t *arrayN){
+ // sort clusters
+ Int_t i;
+
+ if(fNClusterP>1) for (i=0;i<fNClusterP-1;i++)
+ if (SortClustersP(0,(fNClusterP-1),arrayP)==0) break;
+ if(fNClusterN>1) for (i=0;i<fNClusterN-1;i++)
if (SortClustersN(0,(fNClusterN-1),arrayN)==0) break;
-
}
-
-
-
-//---------------------------------------------------
-Int_t AliITSClusterFinderSSD::SortClustersP(Int_t start, Int_t end, Int_t *array)
-{
-//Sort P side clusters
-
-
- Int_t right;
- Int_t left;
- if (start != (end - 1) ) {
- left=this->SortClustersP(start,(start+end)/2,array);
- right=this->SortClustersP((start+end)/2,end,array);
- return (left || right);
- } else {
- left =((AliITSclusterSSD*)((*fClusterP)[array[start]]))->
+//______________________________________________________________________
+Int_t AliITSClusterFinderSSD::SortClustersP(Int_t start, Int_t end,
+ Int_t *array){
+ //Sort P side clusters
+ Int_t right;
+ Int_t left;
+
+ if (start != (end - 1) ) {
+ left=this->SortClustersP(start,(start+end)/2,array);
+ right=this->SortClustersP((start+end)/2,end,array);
+ return (left || right);
+ } else {
+ left =((AliITSclusterSSD*)((*fClusterP)[array[start]]))->
GetDigitStripNo(0);
- right=((AliITSclusterSSD*)((*fClusterP)[array[ end ]]))->
+ right=((AliITSclusterSSD*)((*fClusterP)[array[ end ]]))->
GetDigitStripNo(0);
- if(left>right) {
- Int_t tmp = array[start];
- array[start]=array[end];
- array[end]=tmp;
- return 1;
- } else return 0;
- }
-
-
+ if(left>right) {
+ Int_t tmp = array[start];
+ array[start]=array[end];
+ array[end]=tmp;
+ return 1;
+ } else return 0;
+ } // end if
}
-
-
-
-//-------------------------------------------------------
-Int_t AliITSClusterFinderSSD::SortClustersN(Int_t start, Int_t end, Int_t *array)
-{
-//Sort N side clusters
-
-
- Int_t right;
- Int_t left;
-
- if (start != (end - 1) ) {
- left=this->SortClustersN(start,(start+end)/2,array);
- right=this->SortClustersN((start+end)/2,end,array);
- return (left || right);
- } else {
- left =((AliITSclusterSSD*)((*fClusterN)[array[start]]))->
+//______________________________________________________________________
+Int_t AliITSClusterFinderSSD::SortClustersN(Int_t start, Int_t end,
+ Int_t *array){
+ //Sort N side clusters
+ Int_t right;
+ Int_t left;
+
+ if (start != (end - 1) ) {
+ left=this->SortClustersN(start,(start+end)/2,array);
+ right=this->SortClustersN((start+end)/2,end,array);
+ return (left || right);
+ } else {
+ left =((AliITSclusterSSD*)((*fClusterN)[array[start]]))->
GetDigitStripNo(0);
- right=((AliITSclusterSSD*)((*fClusterN)[array[ end ]]))->
+ right=((AliITSclusterSSD*)((*fClusterN)[array[ end ]]))->
GetDigitStripNo(0);
- if( left > right) {
- Int_t tmp = array[start];
- array[start]=array[end];
- array[end]=tmp;
- return 1;
- } else return 0;
- }
-
+ if( left > right) {
+ Int_t tmp = array[start];
+ array[start]=array[end];
+ array[end]=tmp;
+ return 1;
+ } else return 0;
+ } // end if
}
+//______________________________________________________________________
+void AliITSClusterFinderSSD::ClustersToPackages(){
+ // fill packages
-
-
-//-------------------------------------------------------
-void AliITSClusterFinderSSD::ClustersToPackages()
-{
-// fill packages
-
- Int_t *oneSclP = new Int_t[fNClusterP]; //I want to have sorted 1 S clusters
- Int_t *oneSclN = new Int_t[fNClusterN]; //I can not sort it in TClonesArray
- //so, I create table of indexes and
- //sort it
- //I do not use TArrayI on purpose
- // MB: well, that's not true that one
- //cannot sort objects in TClonesArray
-
- AliITSclusterSSD *currentP;
- AliITSclusterSSD *currentN;
- Int_t j1, j2;
-
-//Fills in One Side Clusters Index Array
- FillClIndexArrays(oneSclP,oneSclN);
-//Sorts filled Arrays
- //SortClusters(oneSclP,oneSclN);
-
- fNPackages=1;
- new ((*fPackages)[0]) AliITSpackageSSD(fClusterP,fClusterN);
-
-
- //This part was includede by Boris Batiounia in March 2001.
-
- // Take all recpoint pairs (x coordinates) in both P and N sides
- // to calculate z coordinates of the recpoints
-
- for (j1=0;j1<fNClusterP;j1++) {
- currentP = GetPSideCluster(oneSclP[j1]);
- Double_t xP = currentP->GetPosition();
- Float_t signalP = currentP->GetTotalSignal();
- for (j2=0;j2<fNClusterN;j2++) {
- currentN = GetNSideCluster(oneSclN[j2]);
- Double_t xN = currentN->GetPosition();
- Float_t signalN = currentN->GetTotalSignal();
- CreateNewRecPoint(xP,1,xN,1,signalP,signalN,currentP, currentN, 0.75);
-
- }
- }
-
- delete [] oneSclP;
- delete [] oneSclN;
-
+ Int_t *oneSclP = new Int_t[fNClusterP];//I want to have sorted 1 S clusters
+ Int_t *oneSclN = new Int_t[fNClusterN];//I can not sort it in TClonesArray
+ //so, I create table of indexes and
+ //sort it
+ //I do not use TArrayI on purpose
+ //MB: well, that's not true that one
+ //cannot sort objs in TClonesArray
+ AliITSclusterSSD *currentP;
+ AliITSclusterSSD *currentN;
+ Int_t j1, j2;
+
+ //Fills in One Side Clusters Index Array
+ FillClIndexArrays(oneSclP,oneSclN);
+ //Sorts filled Arrays
+ //SortClusters(oneSclP,oneSclN);
+
+ fNPackages=1;
+ new ((*fPackages)[0]) AliITSpackageSSD(fClusterP,fClusterN);
+
+ //This part was includede by Boris Batiounia in March 2001.
+ // Take all recpoint pairs (x coordinates) in both P and N sides
+ // to calculate z coordinates of the recpoints
+
+ for (j1=0;j1<fNClusterP;j1++) {
+ currentP = GetPSideCluster(oneSclP[j1]);
+ Double_t xP = currentP->GetPosition();
+ Float_t signalP = currentP->GetTotalSignal();
+ for (j2=0;j2<fNClusterN;j2++) {
+ currentN = GetNSideCluster(oneSclN[j2]);
+ Double_t xN = currentN->GetPosition();
+ Float_t signalN = currentN->GetTotalSignal();
+ CreateNewRecPoint(xP,1,xN,1,signalP,signalN,currentP,currentN,
+ 0.75);
+ } // end for j2
+ } // end for j1
+
+ delete [] oneSclP;
+ delete [] oneSclN;
}
-
-
-//------------------------------------------------------
-Bool_t AliITSClusterFinderSSD::
-CreateNewRecPoint(Float_t P, Float_t dP, Float_t N, Float_t dN,
- Float_t SigP,Float_t SigN,
- AliITSclusterSSD *clusterP, AliITSclusterSSD *clusterN,
- Stat_t prob)
-{
-// create the recpoints
- const Float_t kADCtoKeV = 2.16;
- // 50 ADC units -> 30000 e-h pairs; 1e-h pair -> 3.6e-3 KeV;
- // 1 ADC unit -> (30000/50)*3.6e-3 = 2.16 KeV
- const Float_t kconv = 1.0e-4;
-
- const Float_t kRMSx = 20.0*kconv;
- const Float_t kRMSz = 800.0*kconv;
-
- Int_t n=0;
- Int_t *tr;
- Int_t NTracks;
-
- if (GetCrossing(P,N)) {
-
- //GetCrossingError(dP,dN);
- AliITSRawClusterSSD cnew;
- Int_t nstripsP=clusterP->GetNumOfDigits();
- Int_t nstripsN=clusterN->GetNumOfDigits();
- Float_t signal = 0;
- Float_t dedx = 0;
-
-
- if(SigP>SigN) {
- signal = SigP;
- dedx = SigP*kADCtoKeV;
- }else{
- signal = SigN;
- dedx = SigN*kADCtoKeV;
- }
-
+//______________________________________________________________________
+Bool_t AliITSClusterFinderSSD::CreateNewRecPoint(Float_t P,Float_t dP,
+ Float_t N, Float_t dN,
+ Float_t SigP,Float_t SigN,
+ AliITSclusterSSD *clusterP,
+ AliITSclusterSSD *clusterN,
+ Stat_t prob){
+ // create the recpoints
+ const Float_t kADCtoKeV = 2.16;
+ // 50 ADC units -> 30000 e-h pairs; 1e-h pair -> 3.6e-3 KeV;
+ // 1 ADC unit -> (30000/50)*3.6e-3 = 2.16 KeV
+ const Float_t kconv = 1.0e-4;
+ const Float_t kRMSx = 20.0*kconv;
+ const Float_t kRMSz = 800.0*kconv;
+ Int_t n=0;
+ Int_t *tr;
+ Int_t NTracks;
+
+ if (GetCrossing(P,N)) {
+ //GetCrossingError(dP,dN);
+ AliITSRawClusterSSD cnew;
+ Int_t nstripsP=clusterP->GetNumOfDigits();
+ Int_t nstripsN=clusterN->GetNumOfDigits();
+ Float_t signal = 0;
+ Float_t dedx = 0;
+ if(SigP>SigN) {
+ signal = SigP;
+ dedx = SigP*kADCtoKeV;
+ }else{
+ signal = SigN;
+ dedx = SigN*kADCtoKeV;
+ } // end if SigP>SigN
tr = (Int_t*) clusterP->GetTracks(n);
NTracks = clusterP->GetNTracks();
-
- cnew.fSignalP=SigP;
- cnew.fSignalN=SigN;
- cnew.fMultiplicity=nstripsP;
- cnew.fMultiplicityN=nstripsN;
- cnew.fQErr=TMath::Abs(SigP-SigN);
- cnew.fNtracks=NTracks;
-
- fITS->AddCluster(2,&cnew);
-
- AliITSRecPoint rnew;
- rnew.SetX(P*kconv);
- rnew.SetZ(N*kconv);
- rnew.SetQ(signal);
- rnew.SetdEdX(dedx);
- rnew.SetSigmaX2( kRMSx* kRMSx);
- rnew.SetSigmaZ2( kRMSz* kRMSz);
- rnew.fTracks[0]=tr[0];
- rnew.fTracks[1]=tr[1];
- rnew.fTracks[2]=tr[2];
-
- fITS->AddRecPoint(rnew);
-
- return kTRUE;
- //}
- }
- return kFALSE;
+ cnew.fSignalP=SigP;
+ cnew.fSignalN=SigN;
+ cnew.fMultiplicity=nstripsP;
+ cnew.fMultiplicityN=nstripsN;
+ cnew.fQErr=TMath::Abs(SigP-SigN);
+ cnew.fNtracks=NTracks;
+ fITS->AddCluster(2,&cnew);
+ AliITSRecPoint rnew;
+ rnew.SetX(P*kconv);
+ rnew.SetZ(N*kconv);
+ rnew.SetQ(signal);
+ rnew.SetdEdX(dedx);
+ rnew.SetSigmaX2( kRMSx* kRMSx);
+ rnew.SetSigmaZ2( kRMSz* kRMSz);
+ rnew.fTracks[0]=tr[0];
+ rnew.fTracks[1]=tr[1];
+ rnew.fTracks[2]=tr[2];
+ fITS->AddRecPoint(rnew);
+ return kTRUE;
+ } // end if
+ return kFALSE;
}
-
-
-//------------------------------------------------------
-void AliITSClusterFinderSSD::CalcStepFactor(Float_t Psteo, Float_t Nsteo )
-{
-// calculate the step factor for matching clusters
-
-
- // 95 is the pitch, 4000 - dimension along z ?
-
-
- Float_t dz=fSegmentation->Dz();
-
- fSFF = ( (Int_t) (Psteo*dz/fPitch ) );// +1;
- fSFB = ( (Int_t) (Nsteo*dz/fPitch ) );// +1;
-
+//______________________________________________________________________
+void AliITSClusterFinderSSD::CalcStepFactor(Float_t Psteo, Float_t Nsteo){
+ // calculate the step factor for matching clusters
+ // 95 is the pitch, 4000 - dimension along z ?
+ Float_t dz=fSegmentation->Dz();
+
+ fSFF = ( (Int_t) (Psteo*dz/fPitch ) );// +1;
+ fSFB = ( (Int_t) (Nsteo*dz/fPitch ) );// +1;
}
-
-
-//-----------------------------------------------------------
-AliITSclusterSSD* AliITSClusterFinderSSD::GetPSideCluster(Int_t idx)
-{
-// get P side clusters
-
-
-
-
- if((idx<0)||(idx>=fNClusterP))
- {
- printf("AliITSClusterFinderSSD::GetPSideCluster : index out of range\n");
- return 0;
- }
- else
- {
- return (AliITSclusterSSD*)((*fClusterP)[idx]);
- }
+//______________________________________________________________________
+AliITSclusterSSD* AliITSClusterFinderSSD::GetPSideCluster(Int_t idx){
+ // get P side clusters
+
+ if((idx<0)||(idx>=fNClusterP)){
+ printf("AliITSClusterFinderSSD::GetPSideCluster: index out of range\n");
+ return 0;
+ }else{
+ return (AliITSclusterSSD*)((*fClusterP)[idx]);
+ } // end if
}
-
-//-------------------------------------------------------
-AliITSclusterSSD* AliITSClusterFinderSSD::GetNSideCluster(Int_t idx)
-{
-// get N side clusters
-
- if((idx<0)||(idx>=fNClusterN))
- {
- printf("AliITSClusterFinderSSD::GetNSideCluster : index out of range\n");
- return 0;
- }
- else
- {
- return (AliITSclusterSSD*)((*fClusterN)[idx]);
- }
+//______________________________________________________________________
+AliITSclusterSSD* AliITSClusterFinderSSD::GetNSideCluster(Int_t idx){
+ // get N side clusters
+
+ if((idx<0)||(idx>=fNClusterN)){
+ printf("AliITSClusterFinderSSD::GetNSideCluster: index out of range\n");
+ return 0;
+ }else{
+ return (AliITSclusterSSD*)((*fClusterN)[idx]);
+ } // end if
}
+//______________________________________________________________________
+AliITSclusterSSD* AliITSClusterFinderSSD::GetCluster(Int_t idx, Bool_t side){
+ // Get cluster
-//--------------------------------------------------------
-AliITSclusterSSD* AliITSClusterFinderSSD::GetCluster(Int_t idx, Bool_t side)
-{
-// Get cluster
-
- return (side) ? GetPSideCluster(idx) : GetNSideCluster(idx);
+ return (side) ? GetPSideCluster(idx) : GetNSideCluster(idx);
}
-
-//_______________________________________________________________________
-
-Bool_t AliITSClusterFinderSSD::GetCrossing (Float_t &P, Float_t &N)
-{
-// get crossing
-
- // This function was rivised and changed by Boris Batiounia in March 2001
-
-
-
- Float_t Dx = fSegmentation->Dx(); // detector size in x direction, microns
- Float_t Dz = fSegmentation->Dz(); // detector size in z direction, microns
-
- Float_t xL; // x local coordinate
- Float_t zL; // z local coordinate
- Float_t x; // x = xL + Dx/2
- Float_t z; // z = zL + Dz/2
- Float_t xP; // x coordinate in the P side from the first P strip
- Float_t xN; // x coordinate in the N side from the first N strip
- Float_t StereoP,StereoN;
-
- fSegmentation->Angles(StereoP,StereoN);
- fTanP=TMath::Tan(StereoP);
- fTanN=TMath::Tan(StereoN);
- Float_t kP = fTanP; // Tangent of 0.0075 mrad
- Float_t kN = fTanN; // Tangent of 0.0275 mrad
-
+//______________________________________________________________________
+Bool_t AliITSClusterFinderSSD::GetCrossing (Float_t &P, Float_t &N){
+ // get crossing
+ // This function was rivised and changed by Boris Batiounia in March 2001
+ Float_t Dx = fSegmentation->Dx(); // detector size in x direction, microns
+ Float_t Dz = fSegmentation->Dz(); // detector size in z direction, microns
+ Float_t xL; // x local coordinate
+ Float_t zL; // z local coordinate
+ Float_t x; // x = xL + Dx/2
+ Float_t z; // z = zL + Dz/2
+ Float_t xP; // x coordinate in the P side from the first P strip
+ Float_t xN; // x coordinate in the N side from the first N strip
+ Float_t StereoP,StereoN;
+
+ fSegmentation->Angles(StereoP,StereoN);
+ fTanP=TMath::Tan(StereoP);
+ fTanN=TMath::Tan(StereoN);
+ Float_t kP = fTanP; // Tangent of 0.0075 mrad
+ Float_t kN = fTanN; // Tangent of 0.0275 mrad
P *= fPitch;
N *= fPitch;
return kTRUE;
}
-
-
-//_________________________________________________________________________
-
-void AliITSClusterFinderSSD::GetCrossingError(Float_t& dP, Float_t& dN)
-{
-// get crossing error
-
- Float_t dz, dx;
-
- dz = TMath::Abs(( dP + dN )*fPitch/(fTanP + fTanN) );
- dx = fPitch*(TMath::Abs(dP*(1 - fTanP/(fTanP + fTanN))) +
- TMath::Abs(dN *fTanP/(fTanP + fTanN) ));
-
- dN = dz;
- dP = dx;
+//______________________________________________________________________
+void AliITSClusterFinderSSD::GetCrossingError(Float_t& dP, Float_t& dN){
+ // get crossing error
+ Float_t dz, dx;
+
+ dz = TMath::Abs(( dP + dN )*fPitch/(fTanP + fTanN) );
+ dx = fPitch*(TMath::Abs(dP*(1 - fTanP/(fTanP + fTanN))) +
+ TMath::Abs(dN *fTanP/(fTanP + fTanN) ));
+ dN = dz;
+ dP = dx;
}
-
-
-
-
-
-
-
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff