STEER/AliStrLine.h

   1 #ifndef ALISTRLINE_H
   2 #define ALISTRLINE_H
   3 /* Copyright(c) 1998-2003, ALICE Experiment at CERN, All rights reserved. *
   4  * See cxx source for full Copyright notice                               */
   5
   6 ///////////////////////////////////////////////////////////////////
   7 //                                                               //
   8 // A straight line is coded as a point (3 Double_t) and           //
   9 // 3 direction cosines                                           //
  10 //                                                               //
  11 ///////////////////////////////////////////////////////////////////
  12
  13
  14 class AliStrLine : public TObject {
  15
  16  public:
  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     virtual ~AliStrLine(); // destructor
  23     void PrintStatus() const;
  24     void SetP0(Double_t *point) {for(Int_t i=0;i<3;i++)fP0[i]=point[i];}
  25     void SetSigma2P0(Double_t *sigsq) {for(Int_t i=0;i<3;i++)fSigma2P0[i]=sigsq[i];}
  26     void SetCd(Double_t *cd) {for(Int_t i=0;i<3;i++)fCd[i]=cd[i];}
  27     void SetDebug(Int_t dbfl = 0){fDebug = dbfl; }
  28     void GetP0(Double_t *point) const {for(Int_t i=0;i<3;i++)point[i]=fP0[i];}
  29     void GetSigma2P0(Double_t *sigsq) const {for(Int_t i=0;i<3;i++)sigsq[i]=fSigma2P0[i];}
  30     void GetCd(Double_t *cd) const {for(Int_t i=0;i<3;i++)cd[i]=fCd[i];}
  31     void GetCurrentPoint(Double_t *point) const;
  32     Int_t IsParallelTo(AliStrLine *line) const;
  33     Int_t Crossrphi(AliStrLine *line);
  34     Int_t CrossPoints(AliStrLine *line, Double_t *point1, Double_t *point2);
  35     Int_t Cross(AliStrLine *line, Double_t *point);
  36     Double_t GetDCA(AliStrLine *line) const;
  37     Double_t GetDistFromPoint(Double_t *point) const;
  38  protected:
  39     void InitDirection(Double_t *point, Double_t *cd);
  40     void InitTwoPoints(Double_t *pA, Double_t *pB);
  41     Double_t fP0[3];           // given point
  42     Double_t fSigma2P0[3];           // errors on coordinates of given point
  43     Double_t fCd[3];           // direction cosines
  44     Double_t fTpar;            //! parameter
  45     Int_t   fDebug;           //! debug flag - verbose printing if >0
  46  private:
  47     void SetPar(Double_t par){fTpar = par;}
  48
  49   ClassDef(AliStrLine,2);
  50 };
  51
  52 #endif