TSelectorDraw


class description - source file - inheritance tree

class TSelectorDraw : public TSelector


    protected:
virtual void ClearFormula() virtual void CompileVariables(const char* varexp, const char* selection) public:
TSelectorDraw TSelectorDraw() TSelectorDraw TSelectorDraw(const TSelectorDraw&) virtual void ~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                                                        
                                                                      
                                                                      


TSelectorDraw()
 Default selector constructor.

~TSelectorDraw()
 Selector destructor.

void Begin(TTree *tree)
 Called everytime a loop on the tree(s) starts.

void ClearFormula()
 Delete internal buffers.

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

const char* GetNameByIndex(TString &varexp, Int_t *index,Int_t colindex)
 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

void MakeIndex(TString &varexp, Int_t *index)
 Build Index array for names in varexp.

Bool_t Notify()
 This function is called at the first entry of a new tree in a chain.

void ProcessFill(Int_t entry)
 Called in the entry loop for all entries accepted by Select.

void ProcessFillMultiple(Int_t /*entry*/)
 Called in the entry loop for all entries accepted by Select.
 Complex case with multiplicity.

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

void SetEstimate(Int_t)
 Set number of entries to estimate variable limits.

void TakeAction()
 Execute action for object obj fNfill times.

void TakeEstimate()
 Estimate limits for 1-D, 2-D or 3-D objects.

void Terminate()
 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&)


Author: Rene Brun 08/01/2003
Last update: root/treeplayer:$Name: $:$Id: TSelectorDraw.cxx,v 1.7 2003/01/30 06:40:33 brun Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *


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