library: libHist #include "THStack.h" |
THStack
class description - source file - inheritance tree (.pdf)
protected:
void BuildStack()
public:
THStack()
THStack(const char* name, const char* title)
THStack(const TH1* hist, Option_t* axis = "x", const char* name = "0", const char* title = "0", Int_t firstbin = -1, Int_t lastbin = -1, Int_t firstbin2 = -1, Int_t lastbin2 = -1, Option_t* proj_option = "", Option_t* draw_option = "")
THStack(const THStack& hstack)
virtual ~THStack()
virtual void Add(TH1* h, Option_t* option = "")
virtual void Browse(TBrowser* b)
static TClass* Class()
virtual Int_t DistancetoPrimitive(Int_t px, Int_t py)
virtual void Draw(Option_t* chopt = "")
TH1* GetHistogram() const
TList* GetHists() const
virtual Double_t GetMaximum(Option_t* option = "")
virtual Double_t GetMinimum(Option_t* option = "")
TObjArray* GetStack()
TAxis* GetXaxis() const
TAxis* GetYaxis() const
virtual TClass* IsA() const
virtual void ls(Option_t* option = "") const
virtual void Modified()
THStack& operator=(const THStack&)
virtual void Paint(Option_t* chopt = "")
virtual void Print(Option_t* chopt = "") const
virtual void RecursiveRemove(TObject* obj)
virtual void SavePrimitive(ofstream& out, Option_t* option)
virtual void SetMaximum(Double_t maximum = -1111)
virtual void SetMinimum(Double_t minimum = -1111)
virtual void ShowMembers(TMemberInspector& insp, char* parent)
virtual void Streamer(TBuffer& b)
void StreamerNVirtual(TBuffer& b)
protected:
TList* fHists Pointer to array of TH1
TObjArray* fStack !Pointer to array of sums of TH1
TH1* fHistogram !Pointer to histogram used for drawing axis
Double_t fMaximum Maximum value for plotting along y
Double_t fMinimum Minimum value for plotting along y
A THStack is a collection of TH1 (or derived) objects
Use THStack::Add to add a new histogram to the list.
The THStack does not own the objects in the list.
By default (if option "nostack" is not specified), histograms will be paint
stacked on top of each other.
Example;
THStack hs("hs","test stacked histograms");
TH1F *h1 = new TH1F("h1","test hstack",100,-4,4);
h1->FillRandom("gaus",20000);
h1->SetFillColor(kRed);
hs.Add(h1);
TH1F *h2 = new TH1F("h2","test hstack",100,-4,4);
h2->FillRandom("gaus",15000);
h2->SetFillColor(kBlue);
hs.Add(h2);
TH1F *h3 = new TH1F("h3","test hstack",100,-4,4);
h3->FillRandom("gaus",10000);
h3->SetFillColor(kGreen);
hs.Add(h3);
TCanvas c1("c1","stacked hists",10,10,700,900);
c1.Divide(1,2);
c1.cd(1);
hs.Draw();
c1.cd(2);
hs->Draw("nostack");
See a more complex example in $ROOTSYS/tutorials/hstack.C
Note that picking is supported for all drawing modes.
THStack(): TNamed()
THStack default constructor
THStack(const char *name, const char *title)
: TNamed(name,title)
constructor with name and title
THStack(const TH1* hist, Option_t *axis /*="x"*/,
const char *name /*=0*/, const char *title /*=0*/,
Int_t firstbin /*=-1*/, Int_t lastbin /*=-1*/,
Int_t firstbin2 /*=-1*/, Int_t lastbin2 /*=-1*/,
Option_t* proj_option /*=""*/, Option_t* draw_option /*=""*/): TNamed(name, title)
Creates a new THStack from a TH2 or TH3
It is filled with the 1D histograms from GetProjectionX or GetProjectionY
for each bin of the histogram. It illustrates the differences and total
sum along an axis.
Parameters:
- hist: the histogram used for the projections. Can be an object deriving
from TH2 or TH3.
- axis: for TH2: "x" for ProjectionX, "y" for ProjectionY.
for TH3: see TH3::Project3D.
- name: fName is set to name if given, otherwise to histo's name with
"_stack_<axis>" appended, where <axis> is the value of the
parameter axis.
- title: fTitle is set to title if given, otherwise to histo's title
with ", stack of <axis> projections" appended.
- firstbin, lastbin:
for each bin within [firstbin,lastbin] a stack entry is created.
See TH2::ProjectionX/Y for use overflow bins.
Defaults to "all bins"
- firstbin2, lastbin2:
Other axis range for TH3::Project3D, defaults to "all bins".
Ignored for TH2s
- proj_option:
option passed to TH2::ProjectionX/Y and TH3::Project3D (along
with axis)
- draw_option:
option passed to THStack::Add.
~THStack()
THStack destructor
THStack(const THStack &hstack) : TNamed(hstack)
THStack copy constructor
void Add(TH1 *h1, Option_t *option)
add a new histogram to the list
Only 1-d and 2-d histograms currently supported.
A drawing option may be specified
void Browse(TBrowser *b)
void BuildStack()
build sum of all histograms
Build a separate list fStack containing the running sum of all histograms
Int_t DistancetoPrimitive(Int_t px, Int_t py)
Compute distance from point px,py to each graph
void Draw(Option_t *option)
*-*-*-*-*-*-*-*-*-*-*Draw this multihist with its current attributes*-*-*-*-*-*-*
*-* ==========================================
Options to draw histograms are described in THistPainter::Paint
By default (if option "nostack" is not specified), histograms will be paint
stacked on top of each other.
TH1* GetHistogram() const
Returns a pointer to the histogram used to draw the axis
Takes into account the two following cases.
1- option 'A' was specified in THStack::Draw. Return fHistogram
2- user had called TPad::DrawFrame. return pointer to hframe histogram
IMPORTANT NOTE
You must call Draw before calling this function. The returned histogram
depends on the selected Draw options.
Double_t GetMaximum(Option_t *option)
returns the maximum of all added histograms
returns the maximum of all histograms if option "nostack".
Double_t GetMinimum(Option_t *option)
returns the minimum of all added histograms
returns the minimum of all histograms if option "nostack".
TObjArray* GetStack()
Return pointer to Stack. Build it if not yet done
TAxis* GetXaxis() const
Get x axis of the histogram used to draw the stack.
IMPORTANT NOTE
You must call Draw before calling this function. The returned histogram
depends on the selected Draw options.
TAxis* GetYaxis() const
Get x axis of the histogram used to draw the stack.
IMPORTANT NOTE
You must call Draw before calling this function. The returned histogram
depends on the selected Draw options.
void ls(Option_t *option) const
List histograms in the stack
void Modified()
invalidate sum of histograms
void Paint(Option_t *option)
paint the list of histograms
By default, histograms are shown stacked.
-the first histogram is paint
-then the sum of the first and second, etc
If option "nostack" is specified, histograms are all paint in the same pad
as if the option "same" had been specified.
if option "pads" is specified, the current pad/canvas is subdivided into
a number of pads equal to the number of histograms and each histogram
is paint into a separate pad.
See THistPainter::Paint for a list of valid options.
void Print(Option_t *option) const
Print the list of histograms
void RecursiveRemove(TObject *obj)
Recursively remove object from the list of histograms
void SavePrimitive(ofstream &out, Option_t *option)
Save primitive as a C++ statement(s) on output stream out
void SetMaximum(Double_t maximum)
void SetMinimum(Double_t minimum)
Inline Functions
TList* GetHists() const
TClass* Class()
TClass* IsA() const
void ShowMembers(TMemberInspector& insp, char* parent)
void Streamer(TBuffer& b)
void StreamerNVirtual(TBuffer& b)
THStack& operator=(const THStack&)
Author: Rene Brun 10/12/2001
Last update: root/hist:$Name: $:$Id: THStack.cxx,v 1.41 2006/02/03 21:55:39 pcanal Exp $
Copyright (C) 1995-2001, Rene Brun and Fons Rademakers. *
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