TSelectorDraw

class TSelectorDraw : public TSelector

    protected:

      virtual void ClearFormula()
      virtual void CompileVariables(const char* varexp, const char* selection)

    public:

                        TSelectorDraw()
                        TSelectorDraw(const TSelectorDraw&)
                virtual ~TSelectorDraw()
           virtual void Begin(TTree* tree)
         static TClass* Class()
          virtual Int_t GetAction() const
         virtual Bool_t GetCleanElist() const
          virtual Int_t GetDimension() const
          virtual Int_t GetDrawFlag() const
                  Int_t GetMultiplicity() const
            const char* GetNameByIndex(TString& varexp, Int_t* index, Int_t colindex) const
          virtual Int_t GetNfill() const
               TObject* GetObject() const
                   TH1* GetOldHistogram() const
          TTreeFormula* GetSelect() const
          virtual Int_t GetSelectedRows() const
      virtual Double_t* GetV1() const
      virtual Double_t* GetV2() const
      virtual Double_t* GetV3() const
          TTreeFormula* GetVar1() const
          TTreeFormula* GetVar2() const
          TTreeFormula* GetVar3() const
          TTreeFormula* GetVar4() const
      virtual Double_t* GetW() const
        virtual TClass* IsA() const
           virtual void MakeIndex(TString& varexp, Int_t* index)
         virtual Bool_t Notify()
         virtual Bool_t Process(Int_t)
           virtual void ProcessFill(Int_t entry)
           virtual void ProcessFillMultiple(Int_t entry)
           virtual void ProcessFillObject(Int_t entry)
           virtual void SetEstimate(Int_t n)
           virtual void ShowMembers(TMemberInspector& insp, char* parent)
           virtual void Streamer(TBuffer& b)
                   void StreamerNVirtual(TBuffer& b)
           virtual void TakeAction()
           virtual void TakeEstimate()
           virtual void Terminate()

Data Members

    protected:

                    TTree* fTree            Pointer to current Tree
             TTreeFormula* fVar1            Pointer to first variable formula
             TTreeFormula* fVar2            Pointer to second variable formula
             TTreeFormula* fVar3            Pointer to third variable formula
             TTreeFormula* fVar4            Pointer to fourth variable formula
             TTreeFormula* fSelect          Pointer to selection formula
      TTreeFormulaManager* fManager         Pointer to the formula manager
                  TObject* fObject          ! Pointer to object being filled (histogram, event list)
                  TObject* fTreeElist       pointer to Tree Event list
                      TH1* fOldHistogram    ! Pointer to previously used histogram
                     Int_t fAction          ! Action type
                     Int_t fDraw            ! Last entry loop number when object was drawn
                     Int_t fNfill           ! Total number of histogram fills
                     Int_t fMultiplicity    Indicator of the variability of the size of entries
                     Int_t fDimension       Dimension of the current expression
                     Int_t fSelectedRows    Number of selected entries
                     Int_t fOldEstimate     value of Tree fEstimate when selector is called
                     Int_t fForceRead       Forec Read flag
                     Int_t fNbins[4]        Number of bins per dimension
                  Double_t fVmin[4]         Minima of varexp columns
                  Double_t fVmax[4]         Maxima of varexp columns
                  Double_t fWeight          Tree weight (see TTree::SetWeight)
                 Double_t* fV1              [fSelectedRows]Local buffer for variable 1
                 Double_t* fV2              [fSelectedRows]Local buffer for variable 2
                 Double_t* fV3              [fSelectedRows]Local buffer for variable 3
                 Double_t* fW               [fSelectedRows]Local buffer for weights
                    Bool_t fVar1Multiple    true if var1 has a variable index
                    Bool_t fVar2Multiple    true if var2 has a variable index
                    Bool_t fVar3Multiple    true if var3 has a variable index
                    Bool_t fSelectMultiple  true if selection has a variable index
                    Bool_t fCleanElist      true if original Tree elist must be saved
                    Bool_t fObjEval         true if fVar1 returns an object (or pointer to).

Class Description

                                                                      
 TSelectorDraw                                                        
                                                                      
                                                                      

 Default selector constructor.

 Selector destructor.

 Called everytime a loop on the tree(s) starts.

 Delete internal buffers.

 Compile input variables and selection expression.

  varexp is an expression of the general form e1:e2:e3
    where e1,etc is a formula referencing a combination of the columns
  Example:
     varexp = x  simplest case: draw a 1-Dim distribution of column named x
            = sqrt(x)         : draw distribution of sqrt(x)
            = x*y/z
            = y:sqrt(x) 2-Dim dsitribution of y versus sqrt(x)

  selection is an expression with a combination of the columns
  Example:
      selection = "x<y && sqrt(z)>3.2"
       in a selection all the C++ operators are authorized

 Return name corresponding to colindex in varexp.

 varexp is a string of names separated by :
 index is an array with pointers to the start of name[i] in varexp

 Build Index array for names in varexp.

 This function is called at the first entry of a new tree in a chain.

 Called in the entry loop for all entries accepted by Select.

 Called in the entry loop for all entries accepted by Select.
 Complex case with multiplicity.

 Called in the entry loop for all entries accepted by Select.
 Case where the only variable returns an object (or pointer to).

 Set number of entries to estimate variable limits.

 Execute action for object obj fNfill times.

 Estimate limits for 1-D, 2-D or 3-D objects.

 Called at the end of a loop on a TTree.

Inline Functions

                Int_t GetAction() const
               Bool_t GetCleanElist() const
                Int_t GetDimension() const
                Int_t GetDrawFlag() const
             TObject* GetObject() const
                Int_t GetMultiplicity() const
                Int_t GetNfill() const
                 TH1* GetOldHistogram() const
        TTreeFormula* GetSelect() const
                Int_t GetSelectedRows() const
        TTreeFormula* GetVar1() const
        TTreeFormula* GetVar2() const
        TTreeFormula* GetVar3() const
        TTreeFormula* GetVar4() const
            Double_t* GetV1() const
            Double_t* GetV2() const
            Double_t* GetV3() const
            Double_t* GetW() const
               Bool_t Process(Int_t)
              TClass* Class()
              TClass* IsA() const
                 void ShowMembers(TMemberInspector& insp, char* parent)
                 void Streamer(TBuffer& b)
                 void StreamerNVirtual(TBuffer& b)
        TSelectorDraw TSelectorDraw(const TSelectorDraw&)