1 #ifndef ALIITSCLUSTERFINDERSSD_H
2 #define ALIITSCLUSTERFINDERSSD_H
3 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
11 //#include "AliITSclusterSSD.h"
12 //#include "AliITSpackageSSD.h"
13 #include "AliITSClusterFinder.h"
15 class AliITSclusterSSD;
16 class AliITSpackageSSD;
19 class AliITSClusterFinderSSD: public AliITSClusterFinder
24 AliITSClusterFinderSSD(AliITSsegmentation *seg, TClonesArray *digits, TClonesArray *recp);
26 virtual ~AliITSClusterFinderSSD();
29 void FindRawClusters();
32 void SetAlpha1(Float_t a) {fAlpha1 =a;}
33 void SetAlpha2(Float_t a) {fAlpha2 =a;}
34 void SetAlpha3(Float_t a) {fAlpha3 =a;}
40 void InitReconstruction();
41 Bool_t CreateNewRecPoint(Float_t P, Float_t dP, Float_t N, Float_t dN,
42 Float_t Sig,Float_t dSig,
43 AliITSclusterSSD *clusterP, AliITSclusterSSD *clusterN,
45 Bool_t CreateNewRecPoint(AliITSclusterSSD *clusterP, AliITSclusterSSD *clusterN, Stat_t prob);
47 AliITSclusterSSD* GetPSideCluster(Int_t idx);
48 AliITSclusterSSD* GetNSideCluster(Int_t idx);
49 AliITSclusterSSD* GetCluster(Int_t idx, Bool_t side);
52 void FindNeighbouringDigits();
53 void SeparateOverlappedClusters();
54 void SplitCluster(TArrayI *list, Int_t nsplits, Int_t index, Bool_t side);
55 Int_t SortDigitsP(Int_t start, Int_t end);
56 Int_t SortDigitsN(Int_t start, Int_t end);
57 void FillDigitsIndex();
59 void FillClIndexArrays(Int_t* arrayP, Int_t *arrayN);
60 void SortClusters(Int_t* arrayP, Int_t *arrayN);
61 Int_t SortClustersP(Int_t start, Int_t end,Int_t *array);
62 Int_t SortClustersN(Int_t start, Int_t end,Int_t *array);
63 void ConsumeClusters();
64 void ClustersToPackages();
65 void PackagesToPoints();
66 void ReconstructNotConsumedClusters();
67 Bool_t Strip2Local( Float_t stripP, Float_t stripN, Float_t &Z,Float_t &X);
68 Float_t GetClusterZ(AliITSclusterSSD* clust);
69 Bool_t IsCrossing(AliITSclusterSSD* p, AliITSclusterSSD* n);
70 //returns index of best combination in "comb"
71 Int_t GetBestComb(Int_t** comb,Int_t Ncomb, Int_t Ncl, AliITSpackageSSD * pkg);
73 //get point that have best signal ratio
74 void GetBestMatchingPoint(Int_t & ip, Int_t & in, AliITSpackageSSD* pkg );
76 //calculates Distance To Perfect Matching Line
77 Float_t DistToPML(Float_t psig, Float_t nsig){ return (TMath::Abs( (7.0*nsig - 8.0*psig )/10.630146) );}
80 Int_t GetDiff(Float_t *retx, Float_t *rety) {return 0;}
82 void CalcStepFactor(Float_t Psteo, Float_t Nsteo );
84 /*************************************************/
85 /** methods for resolving packages ****/
86 /*************************************************/
87 //names may not be meaningful for all, see implementations for descriptions
89 void ResolveSimplePackage(AliITSpackageSSD *pkg);
90 void ResolvePackageWithOnePSideCluster(AliITSpackageSSD *pkg);
91 void ResolvePackageWithOneNSideCluster(AliITSpackageSSD *pkg);
92 void ResolveTwoForTwoPackage(AliITSpackageSSD *pkg);
94 void ResolveClusterWithOneCross(AliITSpackageSSD *pkg,
95 Int_t clusterIndex, Bool_t clusterSide);
97 void ResolvePClusterWithOneCross(AliITSpackageSSD *pkg, Int_t clusterIndex);
98 void ResolveNClusterWithOneCross(AliITSpackageSSD *pkg, Int_t clusterIndex);
99 Bool_t ResolvePackageBestCombin(AliITSpackageSSD *pkg);
100 void ResolveOneBestMatchingPoint(AliITSpackageSSD *pkg);
102 Bool_t GetCrossing(Float_t &x, Float_t &z); //x, y of strips crossing
103 void GetCrossingError(Float_t&, Float_t&); //x, y of strips crossing errors
107 AliITS *fITS; //!Pointer to AliITS object
109 TClonesArray *fRecPoints; //!Pointer to TClonesArray of rec points
111 TClonesArray *fClusterP; //!
112 Int_t fNClusterP; //!Number of P side clusters in the array
114 TClonesArray *fClusterN; //!Number of N side clusters in the array
115 Int_t fNClusterN; //!
117 TClonesArray *fPackages; //!packages
118 Int_t fNPackages; //!
120 TArrayI *fDigitsIndexP; //!Digits on P side
121 Int_t fNDigitsP; //!Number of Digits on P side
123 TArrayI *fDigitsIndexN; //!Digits on N side
124 Int_t fNDigitsN; //!Number of Digits on N side
127 Float_t fPitch; //!Strip pitch
128 Float_t fTanP; //!Pside stereo angle tangent
129 Float_t fTanN; //!Nside stereo angle tangent
131 /*************************************************/
132 /** parameters for reconstruction ****/
133 /** to be tune when slow simulation raliable ****/
134 /*************************************************/
139 Float_t fPNsignalRatio; //!
142 static const Bool_t fgkSIDEP; //!
143 static const Bool_t fgkSIDEN; //!
146 Int_t fSFF; //!forward stepping factor
147 Int_t fSFB; //!backward stepping factor
150 ClassDef(AliITSClusterFinderSSD, 1) //Class for clustering and reconstruction of space points in SSDs