library: libHist
#include "THLimitsFinder.h"

THLimitsFinder

class description - source file - inheritance tree (.pdf)

class THLimitsFinder : public TObject

Inheritance Chart:

TObject

THLimitsFinder


    public:

                             THLimitsFinder()
                             THLimitsFinder(const THLimitsFinder&)
                     virtual ~THLimitsFinder()
              static TClass* Class()
               virtual Int_t FindGoodLimits(TH1* h, Axis_t xmin, Axis_t xmax)
               virtual Int_t FindGoodLimits(TH1* h, Axis_t xmin, Axis_t xmax, Axis_t ymin, Axis_t ymax)
               virtual Int_t FindGoodLimits(TH1* h, Axis_t xmin, Axis_t xmax, Axis_t ymin, Axis_t ymax, Axis_t zmin, Axis_t zmax)
      static THLimitsFinder* GetLimitsFinder()
             virtual TClass* IsA() const
             THLimitsFinder& operator=(const THLimitsFinder&)
                 static void Optimize(Double_t A1, Double_t A2, Int_t nold, Double_t& BinLow, Double_t& BinHigh, Int_t& nbins, Double_t& BWID, Option_t* option = "")
                 static void OptimizeLimits(Int_t nbins, Int_t& newbins, Axis_t& xmin, Axis_t& xmax, Bool_t isInteger)
                 static void SetLimitsFinder(THLimitsFinder* finder)
                virtual void ShowMembers(TMemberInspector& insp, char* parent)
                virtual void Streamer(TBuffer& b)
                        void StreamerNVirtual(TBuffer& b)

Data Members


    protected:

      static THLimitsFinder* fgLimitsFinder  !Pointer to hist limits finder

Class Description

                                                                      
 THLimitsFinder                                                       
                                                                      
 Class to compute nice axis limits.

 This class is called by default by the histograming system
 and also by TTree::Draw, TTreePlayer::DrawSelect.

 A different finder may be specified via THLimitsFinder::SetFinder.

THLimitsFinder()

~THLimitsFinder()

Int_t FindGoodLimits(TH1 *h, Axis_t xmin, Axis_t xmax)

 compute the best axis limits for the X axis.
 If the bit kIsInteger is set, the number of channels is also recomputed.
 The axis parameters are replaced by the optimized parameters
 example:
  With the input parameters xmin=-1.467 and xmax=2.344, the function
  will compute better limits -1.8 and 2.7 and store them in the axis.

OptimizeLimits(xaxis->GetNbins(), newbins,xmin,xmax, xaxis->TestBit(TAxis::kIsInteger)); h->SetBins(newbins,xmin,xmax); return 0; } //______________________________________________________________________________ Int_t THLimitsFinder::FindGoodLimits(TH1 *h, Axis_t xmin, Axis_t xmax, Axis_t ymin, Axis_t ymax)

 compute the best axis limits for the X and Y axis.
 If the bit kIsInteger is set, the number of channels is also recomputed.
 The axis parameters are replaced by the optimized parameters

OptimizeLimits(xaxis->GetNbins(), newbinsx,xmin,xmax, xaxis->TestBit(TAxis::kIsInteger)); THLimitsFinder::OptimizeLimits(yaxis->GetNbins(), newbinsy,ymin,ymax, yaxis->TestBit(TAxis::kIsInteger)); h->SetBins(newbinsx,xmin,xmax,newbinsy,ymin,ymax); return 0; } //______________________________________________________________________________ Int_t THLimitsFinder::FindGoodLimits(TH1 *h, Axis_t xmin, Axis_t xmax, Axis_t ymin, Axis_t ymax, Axis_t zmin, Axis_t zmax)

 compute the best axis limits for the X, Y and Z axis.
 If the bit kIsInteger is set, the number of channels is also recomputed.
 The axis parameters are replaced by the optimized parameters

OptimizeLimits(xaxis->GetNbins(), newbinsx,xmin,xmax, xaxis->TestBit(TAxis::kIsInteger)); THLimitsFinder::OptimizeLimits(yaxis->GetNbins(), newbinsy,ymin,ymax, yaxis->TestBit(TAxis::kIsInteger)); THLimitsFinder::OptimizeLimits(zaxis->GetNbins(), newbinsz,zmin,zmax, zaxis->TestBit(TAxis::kIsInteger)); h->SetBins(newbinsx,xmin,xmax,newbinsy,ymin,ymax,newbinsz,zmin,zmax); return 0; } //______________________________________________________________________________ THLimitsFinder *THLimitsFinder::GetLimitsFinder()

 Return pointer to the current finder.
 Create one if none exists
 Use SetLimitsFinder to set a user defined finder.

void SetLimitsFinder(THLimitsFinder *finder)

 This static function can be used to specify a finder derived from THLimitsFinder.
 The finder may redefine the functions FindGoodLimits.
 Note that the redefined functions may call THLimitsFinder::FindGoodLimits.

void Optimize(Double_t A1, Double_t A2, Int_t nold ,Double_t &BinLow, Double_t &BinHigh, Int_t &nbins, Double_t &BinWidth, Option_t *option)

 static function to compute reasonable axis limits

 Input parameters:

  A1,A2 : Old WMIN,WMAX .
  BinLow,BinHigh : New WMIN,WMAX .
  nold   : Old NDIV .
  nbins    : New NDIV .

void OptimizeLimits(Int_t nbins, Int_t &newbins, Axis_t &xmin, Axis_t &xmax, Bool_t isInteger)

 Optimize axis limits.
 When isInter=kTRUE, the function makes an integer binwidth
 and recompute the number of bins accordingly.

Inline Functions

                  Int_t FindGoodLimits(TH1* h, Axis_t xmin, Axis_t xmax, Axis_t ymin, Axis_t ymax)
                  Int_t FindGoodLimits(TH1* h, Axis_t xmin, Axis_t xmax, Axis_t ymin, Axis_t ymax, Axis_t zmin, Axis_t zmax)
        THLimitsFinder* GetLimitsFinder()
                TClass* Class()
                TClass* IsA() const
                   void ShowMembers(TMemberInspector& insp, char* parent)
                   void Streamer(TBuffer& b)
                   void StreamerNVirtual(TBuffer& b)
         THLimitsFinder THLimitsFinder(const THLimitsFinder&)
        THLimitsFinder& operator=(const THLimitsFinder&)

Author: Rene Brun 14/01/2002
Last update: root/hist:$Name: $:$Id: THLimitsFinder.cxx,v 1.9 2005/08/29 10:45:07 brun Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *

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