3 /* Copyright(c) 1998-2003, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
6 ///////////////////////////////////////////////////////////////////
8 // A straight line is coded as a point (3 Double_t) and //
9 // 3 direction cosines //
11 ///////////////////////////////////////////////////////////////////
14 class AliStrLine : public TObject {
17 AliStrLine(); // default constructor
18 AliStrLine(Double_t *point, Double_t *cd, Bool_t twopoints=kFALSE); // standard constructor
19 AliStrLine(Float_t *pointf, Float_t *cdf, Bool_t twopoints=kFALSE);
20 AliStrLine(Double_t *point, Double_t *sig2point, Double_t *cd, Bool_t twopoints=kFALSE);
21 AliStrLine(Float_t *pointf, Float_t *sig2point, Float_t *cdf, Bool_t twopoints=kFALSE);
22 AliStrLine(Double_t *point, Double_t *sig2point, Double_t *wmat, Double_t *cd, Bool_t twopoints=kFALSE);
23 AliStrLine(Float_t *pointf, Float_t *sig2point, Float_t *wmat, Float_t *cdf, Bool_t twopoints=kFALSE);
24 AliStrLine(const AliStrLine& source);
25 AliStrLine& operator=(const AliStrLine& source);
26 virtual ~AliStrLine(); // destructor
27 virtual void Clear(Option_t*){if(fWMatrix)delete[] fWMatrix; fWMatrix = 0;}
28 void PrintStatus() const;
29 void SetP0(const Double_t *point) {for(Int_t i=0;i<3;i++)fP0[i]=point[i];}
30 void SetSigma2P0(const Double_t *sigsq) {for(Int_t i=0;i<3;i++)fSigma2P0[i]=sigsq[i];}
31 void SetWMatrix(const Double_t *wmat);
32 void SetCd(const Double_t *cd) {for(Int_t i=0;i<3;i++)fCd[i]=cd[i];}
33 void GetP0(Double_t *point) const {for(Int_t i=0;i<3;i++)point[i]=fP0[i];}
34 void GetSigma2P0(Double_t *sigsq) const {for(Int_t i=0;i<3;i++)sigsq[i]=fSigma2P0[i];}
35 void GetWMatrix(Double_t *wmat) const;
36 void GetCd(Double_t *cd) const {for(Int_t i=0;i<3;i++)cd[i]=fCd[i];}
37 void GetCurrentPoint(Double_t *point) const;
38 Int_t IsParallelTo(AliStrLine *line) const;
39 Int_t Crossrphi(AliStrLine *line);
40 Int_t CrossPoints(AliStrLine *line, Double_t *point1, Double_t *point2);
41 Int_t Cross(AliStrLine *line, Double_t *point);
42 Double_t GetDCA(AliStrLine *line) const;
43 Double_t GetDistFromPoint(Double_t *point) const;
45 void InitDirection(Double_t *point, Double_t *cd);
46 void InitTwoPoints(Double_t *pA, Double_t *pB);
47 Double_t fP0[3]; // given point
48 Double_t fSigma2P0[3]; // errors on coordinates of given point
49 Double_t *fWMatrix; //[6] weighting matrix
50 /* fWMatrix is a symmetric matrix internally stored as
51 0 --> row = 0, col = 0
57 The external interface (constructor, getter and setter) is:
58 0 --> row = 0, col = 0
67 Double_t fCd[3]; // direction cosines
68 Double_t fTpar; //! parameter
70 void SetPar(const Double_t par){fTpar = par;}
72 ClassDef(AliStrLine,4);