The Histogram stack class.

A THStack is a collection of TH1 or TH2 histograms. Using THStack::Draw() the histogram collection is drawn in one go according to the drawing option.

THStack::Add() allows to add a new histogram to the list. The THStack does not own the objects in the list.

By default (if no option drawing option is specified), histograms will be paint stacked on top of each other. TH2 are stacked as lego plots.

If option "nostack" is specified the histograms are not drawn on top of each other but as they would if drawn using the option "same".

If option "nostackb" is specified the histograms are drawn next to each other as bar charts.

In all cases The axis range is computed automatically along the X and Y axis in order to show the complete histogram collection.

Example;

{
   THStack *hs = new THStack("hs","");
   TH1F *h1 = new TH1F("h1","test hstack",10,-4,4);
   h1->FillRandom("gaus",20000);
   h1->SetFillColor(kRed);
   hs->Add(h1);
   TH1F *h2 = new TH1F("h2","test hstack",10,-4,4);
   h2->FillRandom("gaus",15000);
   h2->SetFillColor(kBlue);
   hs->Add(h2);
   TH1F *h3 = new TH1F("h3","test hstack",10,-4,4);
   h3->FillRandom("gaus",10000);
   h3->SetFillColor(kGreen);
   hs->Add(h3);
   TCanvas *cs = new TCanvas("cs","cs",10,10,700,900);
   TText T; T.SetTextFont(42); T.SetTextAlign(21);
   cs->Divide(2,2);
   cs->cd(1); hs->Draw(); T.DrawTextNDC(.5,.95,"Default drawing option");
   cs->cd(2); hs->Draw("nostack"); T.DrawTextNDC(.5,.95,"Option \"nostack\"");
   cs->cd(3); hs->Draw("nostackb"); T.DrawTextNDC(.5,.95,"Option \"nostackb\"");
   cs->cd(4); hs->Draw("lego1"); T.DrawTextNDC(.5,.95,"Option \"lego1\"");
   return cs;
}

A more complex example:

TCanvas *hstack() {
   THStack *hs = new THStack("hs","Stacked 1D histograms");
   //create three 1-d histograms
   TH1F *h1st = new TH1F("h1st","test hstack",100,-4,4);
   h1st->FillRandom("gaus",20000);
   h1st->SetFillColor(kRed);
   h1st->SetMarkerStyle(21);
   h1st->SetMarkerColor(kRed);
   hs->Add(h1st);
   TH1F *h2st = new TH1F("h2st","test hstack",100,-4,4);
   h2st->FillRandom("gaus",15000);
   h2st->SetFillColor(kBlue);
   h2st->SetMarkerStyle(21);
   h2st->SetMarkerColor(kBlue);
   hs->Add(h2st);
   TH1F *h3st = new TH1F("h3st","test hstack",100,-4,4);
   h3st->FillRandom("gaus",10000);
   h3st->SetFillColor(kGreen);
   h3st->SetMarkerStyle(21);
   h3st->SetMarkerColor(kGreen);
   hs->Add(h3st);
   TCanvas *cst = new TCanvas("cst","stacked hists",10,10,700,700);
   cst->Divide(2,2);
   // in top left pad, draw the stack with defaults
   cst->cd(1);
   hs->Draw();
   // in top right pad, draw the stack in non-stack mode
   // and errors option
   cst->cd(2);
   gPad->SetGrid();
   hs->Draw("nostack,e1p");
   //in bottom left, draw in stack mode with "lego1" option
   cst->cd(3);
   gPad->SetFrameFillColor(17);
   gPad->SetTheta(3.77);
   gPad->SetPhi(2.9);
   hs->Draw("lego1");
   cst->cd(4);
   //create two 2-D histograms and draw them in stack mode
   gPad->SetFrameFillColor(17);
   THStack *a = new THStack("a","Stacked 2D histograms");
   TF2 *f1 = new TF2("f1",
      "xygaus + xygaus(5) + xylandau(10)",-4,4,-4,4);
   Double_t params1[] = {130,-1.4,1.8,1.5,1, 150,2,0.5,-2,0.5,
      3600,-2,0.7,-3,0.3};
   f1->SetParameters(params1);
   TH2F *h2sta = new TH2F("h2sta","h2sta",20,-4,4,20,-4,4);
   h2sta->SetFillColor(38);
   h2sta->FillRandom("f1",4000);
   TF2 *f2 = new TF2("f2","xygaus + xygaus(5)",-4,4,-4,4);
   Double_t params2[] = {100,-1.4,1.9,1.1,2, 80,2,0.7,-2,0.5};
   f2->SetParameters(params2);
   TH2F *h2stb = new TH2F("h2stb","h2stb",20,-4,4,20,-4,4);
   h2stb->SetFillColor(46);
   h2stb->FillRandom("f2",3000);
   a->Add(h2sta);
   a->Add(h2stb);
   a->Draw();
   return cst;
}

Note that picking is supported for all drawing modes.

Since: ROOT version 6.07/07: Stacks of 2D histograms can also be painted as candle plots:; ROOT version 6.09/02: Stacks of 2D histograms can also be painted as violin plots, combinations of candle and violin plots are possible as well:

void candleplotstack()
{
   gStyle->SetTimeOffset(0);
   TRandom *randnum      = new TRandom();
   TDatime *dateBegin = new TDatime(2010,1,1,0,0,0);
   TDatime *dateEnd   = new TDatime(2011,1,1,0,0,0);
   int bins = 1000;
   TH2I *h1 = new TH2I("h1","Machine A",6,dateBegin->Convert(),dateEnd->Convert(),bins,0,1000);
   TH2I *h2 = new TH2I("h2","Machine B",6,dateBegin->Convert(),dateEnd->Convert(),bins,0,1000);
   TH2I *hsum = new TH2I("h4","Sum",6,dateBegin->Convert(),dateEnd->Convert(),bins,0,1000);
   float Rand;
   for (int i = dateBegin->Convert(); i < dateEnd->Convert(); i+=86400*30) {
      for (int j = 0; j < 1000; j++) {
         Rand = randnum->Gaus(500+sin(i/10000000.)*100,50); h1->Fill(i,Rand); hsum->Fill(i,Rand);
         Rand = randnum->Gaus(500+sin(i/12000000.)*100,50); h2->Fill(i,Rand); hsum->Fill(i,Rand);
      }
   }
   h2->SetLineColor(kRed);
   hsum->SetFillColor(kGreen);
   TCanvas *c1 = new TCanvas();
   THStack *hs = new THStack("hs","Machine A+B");
   hs->Add(h1);
   hs->Add(h2,"candle2");
   hs->Add(hsum, "violin1");
   hs->Draw("candle3");
   hs->GetXaxis()->SetNdivisions(410);
   
   gPad->SetGrid(1,0);
   hs->GetXaxis()->SetTimeDisplay(1);
   hs->GetXaxis()->SetTimeFormat("%m/%y");
   hs->GetXaxis()->SetTitle("Date [month/year]");
   c1->Modified();
   gPad->BuildLegend(0.75,0.75,0.95,0.95,"");
}

Automatic coloring according to the current palette is available as shown in the following example:

void thstackpalettecolor()
{
   THStack *hs = new THStack("hs","Stacked 1D histograms colored using kOcean palette");
   gStyle->SetPalette(kOcean);
   // Create three 1-d histograms  and add them in the stack
   TH1F *h1st = new TH1F("h1st","test hstack",100,-4,4);
   h1st->FillRandom("gaus",20000);
   hs->Add(h1st);
   TH1F *h2st = new TH1F("h2st","test hstack",100,-4,4);
   h2st->FillRandom("gaus",15000);
   hs->Add(h2st);
   TH1F *h3st = new TH1F("h3st","test hstack",100,-4,4);
   h3st->FillRandom("gaus",10000);
   hs->Add(h3st);
   // draw the stack
   hs->Draw("pfc nostack");
}

Definition at line 31 of file THStack.h.

Public Member Functions
	THStack ()
	THStack default constructor. More...

	THStack (const char name, const char title)
	constructor with name and title More...

	THStack (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="")
	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. More...

	THStack (const THStack &hstack)
	THStack copy constructor. More...

virtual	~THStack ()
	THStack destructor. More...

virtual void	Add (TH1 h, Option_t option="")
	add a new histogram to the list Only 1-d and 2-d histograms currently supported. More...

TIter	begin () const
	Get iterator over internal hists list. More...

virtual void	Browse (TBrowser *b)
	Browse. More...

virtual Int_t	DistancetoPrimitive (Int_t px, Int_t py)
	Compute distance from point px,py to each graph. More...

virtual void	Draw (Option_t *chopt="")
	Draw this multihist with its current attributes. More...

TIter	end () const

TH1 *	GetHistogram () const
	Returns a pointer to the histogram used to draw the axis Takes into account the two following cases. More...

TList *	GetHists () const

virtual Double_t	GetMaximum (Option_t *option="")
	returns the maximum of all added histograms returns the maximum of all histograms if option "nostack". More...

virtual Double_t	GetMinimum (Option_t *option="")
	returns the minimum of all added histograms returns the minimum of all histograms if option "nostack". More...

Int_t	GetNhists () const
	Return the number of histograms in the stack. More...

TObjArray *	GetStack ()
	Return pointer to Stack. Build it if not yet done. More...

TAxis *	GetXaxis () const
	Get x axis of the histogram used to draw the stack. More...

TAxis *	GetYaxis () const
	Get x axis of the histogram used to draw the stack. More...

virtual void	ls (Option_t *option="") const
	List histograms in the stack. More...

virtual Long64_t	Merge (TCollection li, TFileMergeInfo info)
	Merge the THStack in the TList into this stack. More...

virtual void	Modified ()
	invalidate sum of histograms More...

virtual void	Paint (Option_t *chopt="")
	Paint the list of histograms. More...

virtual void	Print (Option_t *chopt="") const
	Print the list of histograms. More...

virtual void	RecursiveRemove (TObject *obj)
	Recursively remove object from the list of histograms. More...

virtual void	SavePrimitive (std::ostream &out, Option_t *option="")
	Save primitive as a C++ statement(s) on output stream out. More...

virtual void	SetHistogram (TH1 *h)

virtual void	SetMaximum (Double_t maximum=-1111)
	Set maximum. More...

virtual void	SetMinimum (Double_t minimum=-1111)
	Set minimum. More...

Public Member Functions inherited from TNamed
	TNamed ()

	TNamed (const char name, const char title)

	TNamed (const TString &name, const TString &title)

	TNamed (const TNamed &named)
	TNamed copy ctor. More...

virtual	~TNamed ()

virtual void	Clear (Option_t *option="")
	Set name and title to empty strings (""). More...

virtual TObject *	Clone (const char *newname="") const
	Make a clone of an object using the Streamer facility. More...

virtual Int_t	Compare (const TObject *obj) const
	Compare two TNamed objects. More...

virtual void	Copy (TObject &named) const
	Copy this to obj. More...

virtual void	FillBuffer (char *&buffer)
	Encode TNamed into output buffer. More...

virtual const char *	GetName () const
	Returns name of object. More...

virtual const char *	GetTitle () const
	Returns title of object. More...

virtual ULong_t	Hash () const
	Return hash value for this object. More...

virtual Bool_t	IsSortable () const

TNamed &	operator= (const TNamed &rhs)
	TNamed assignment operator. More...

virtual void	SetName (const char *name)
	Set the name of the TNamed. More...

virtual void	SetNameTitle (const char name, const char title)
	Set all the TNamed parameters (name and title). More...

virtual void	SetTitle (const char *title="")
	Set the title of the TNamed. More...

virtual Int_t	Sizeof () const
	Return size of the TNamed part of the TObject. More...

Public Member Functions inherited from TObject
	TObject ()
	TObject constructor. More...

	TObject (const TObject &object)
	TObject copy ctor. More...

virtual	~TObject ()
	TObject destructor. More...

void	AbstractMethod (const char *method) const
	Use this method to implement an "abstract" method that you don't want to leave purely abstract. More...

virtual void	AppendPad (Option_t *option="")
	Append graphics object to current pad. More...

virtual const char *	ClassName () const
	Returns name of class to which the object belongs. More...

virtual void	Delete (Option_t *option="")
	Delete this object. More...

virtual void	DrawClass () const
	Draw class inheritance tree of the class to which this object belongs. More...

virtual TObject *	DrawClone (Option_t *option="") const
	Draw a clone of this object in the current selected pad for instance with: `gROOT->SetSelectedPad(gPad)`. More...

virtual void	Dump () const
	Dump contents of object on stdout. More...

virtual void	Error (const char method, const char msgfmt,...) const
	Issue error message. More...

virtual void	Execute (const char method, const char params, Int_t *error=0)
	Execute method on this object with the given parameter string, e.g. More...

virtual void	Execute (TMethod method, TObjArray params, Int_t *error=0)
	Execute method on this object with parameters stored in the TObjArray. More...

virtual void	ExecuteEvent (Int_t event, Int_t px, Int_t py)
	Execute action corresponding to an event at (px,py). More...

virtual void	Fatal (const char method, const char msgfmt,...) const
	Issue fatal error message. More...

virtual TObject *	FindObject (const char *name) const
	Must be redefined in derived classes. More...

virtual TObject *	FindObject (const TObject *obj) const
	Must be redefined in derived classes. More...

virtual Option_t *	GetDrawOption () const
	Get option used by the graphics system to draw this object. More...

virtual const char *	GetIconName () const
	Returns mime type name of object. More...

virtual char *	GetObjectInfo (Int_t px, Int_t py) const
	Returns string containing info about the object at position (px,py). More...

virtual Option_t *	GetOption () const

virtual UInt_t	GetUniqueID () const
	Return the unique object id. More...

virtual Bool_t	HandleTimer (TTimer *timer)
	Execute action in response of a timer timing out. More...

virtual void	Info (const char method, const char msgfmt,...) const
	Issue info message. More...

virtual Bool_t	InheritsFrom (const char *classname) const
	Returns kTRUE if object inherits from class "classname". More...

virtual Bool_t	InheritsFrom (const TClass *cl) const
	Returns kTRUE if object inherits from TClass cl. More...

virtual void	Inspect () const
	Dump contents of this object in a graphics canvas. More...

void	InvertBit (UInt_t f)

virtual Bool_t	IsEqual (const TObject *obj) const
	Default equal comparison (objects are equal if they have the same address in memory). More...

virtual Bool_t	IsFolder () const
	Returns kTRUE in case object contains browsable objects (like containers or lists of other objects). More...

Bool_t	IsOnHeap () const

Bool_t	IsZombie () const

void	MayNotUse (const char *method) const
	Use this method to signal that a method (defined in a base class) may not be called in a derived class (in principle against good design since a child class should not provide less functionality than its parent, however, sometimes it is necessary). More...

virtual Bool_t	Notify ()
	This method must be overridden to handle object notification. More...

void	Obsolete (const char method, const char asOfVers, const char *removedFromVers) const
	Use this method to declare a method obsolete. More...

void	operator delete (void *ptr)
	Operator delete. More...

void	operator delete[] (void *ptr)
	Operator delete []. More...

void *	operator new (size_t sz)

void *	operator new (size_t sz, void *vp)

void *	operator new[] (size_t sz)

void *	operator new[] (size_t sz, void *vp)

TObject &	operator= (const TObject &rhs)
	TObject assignment operator. More...

virtual void	Pop ()
	Pop on object drawn in a pad to the top of the display list. More...

virtual Int_t	Read (const char *name)
	Read contents of object with specified name from the current directory. More...

void	ResetBit (UInt_t f)

virtual void	SaveAs (const char filename="", Option_t option="") const
	Save this object in the file specified by filename. More...

void	SetBit (UInt_t f, Bool_t set)
	Set or unset the user status bits as specified in f. More...

void	SetBit (UInt_t f)

virtual void	SetDrawOption (Option_t *option="")
	Set drawing option for object. More...

virtual void	SetUniqueID (UInt_t uid)
	Set the unique object id. More...

virtual void	SysError (const char method, const char msgfmt,...) const
	Issue system error message. More...

Bool_t	TestBit (UInt_t f) const

Int_t	TestBits (UInt_t f) const

virtual void	UseCurrentStyle ()
	Set current style settings in this object This function is called when either TCanvas::UseCurrentStyle or TROOT::ForceStyle have been invoked. More...

virtual void	Warning (const char method, const char msgfmt,...) const
	Issue warning message. More...

virtual Int_t	Write (const char *name=0, Int_t option=0, Int_t bufsize=0)
	Write this object to the current directory. More...

virtual Int_t	Write (const char *name=0, Int_t option=0, Int_t bufsize=0) const
	Write this object to the current directory. More...

Protected Member Functions
void	BuildStack ()
	build sum of all histograms Build a separate list fStack containing the running sum of all histograms More...

Protected Member Functions inherited from TObject
virtual void	DoError (int level, const char location, const char fmt, va_list va) const
	Interface to ErrorHandler (protected). More...

void	MakeZombie ()

Protected Attributes
TH1 *	fHistogram
	Pointer to array of sums of TH1. More...

TList *	fHists

Double_t	fMaximum

Double_t	fMinimum

TObjArray *	fStack

Protected Attributes inherited from TNamed
TString	fName

TString	fTitle

Private Member Functions
THStack &	operator= (const THStack &)

Additional Inherited Members
Public Types inherited from TObject
enum	{ kIsOnHeap = 0x01000000, kNotDeleted = 0x02000000, kZombie = 0x04000000, kBitMask = 0x00ffffff }

enum	{ kSingleKey = BIT(0), kOverwrite = BIT(1), kWriteDelete = BIT(2) }

enum	EStatusBits { kCanDelete = BIT(0), kMustCleanup = BIT(3), kObjInCanvas = BIT(3), kIsReferenced = BIT(4), kHasUUID = BIT(5), kCannotPick = BIT(6), kNoContextMenu = BIT(8), kInvalidObject = BIT(13) }

Static Public Member Functions inherited from TObject
static Long_t	GetDtorOnly ()
	Return destructor only flag. More...

static Bool_t	GetObjectStat ()
	Get status of object stat flag. More...

static void	SetDtorOnly (void *obj)
	Set destructor only flag. More...

static void	SetObjectStat (Bool_t stat)
	Turn on/off tracking of objects in the TObjectTable. More...

#include <THStack.h>

Inheritance diagram for THStack:

[legend]

Constructor & Destructor Documentation

◆ THStack() [1/4]

THStack::THStack ( )

THStack default constructor.

Definition at line 116 of file THStack.cxx.

◆ THStack() [2/4]

THStack::THStack	(	const char *	name,
		const char *	title
	)

constructor with name and title

Definition at line 128 of file THStack.cxx.

◆ THStack() [3/4]

THStack::THStack	(	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 = `""`
	)

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 but under- / overflow"
firstbin2, lastbin2: Other axis range for TH3::Project3D, defaults to "all bins but under- / overflow". Ignored for TH2s
proj_option: option passed to TH2::ProjectionX/Y and TH3::Project3D (along with axis)
draw_option: option passed to THStack::Add.

Definition at line 170 of file THStack.cxx.

◆ THStack() [4/4]

THStack::THStack ( const THStack & hstack )

THStack copy constructor.

Definition at line 342 of file THStack.cxx.

◆ ~THStack()

THStack::~THStack ( )

virtual

THStack destructor.

Definition at line 323 of file THStack.cxx.

Member Function Documentation

◆ Add()

void THStack::Add	(	TH1 *	h1,
		Option_t *	option = `""`
	)

virtual

add a new histogram to the list Only 1-d and 2-d histograms currently supported.

A drawing option may be specified

Definition at line 362 of file THStack.cxx.

◆ begin()

TIter THStack::begin ( ) const

Get iterator over internal hists list.

Definition at line 1070 of file THStack.cxx.

◆ Browse()

void THStack::Browse ( TBrowser * b )

virtual

Browse.

Reimplemented from TObject.

Definition at line 377 of file THStack.cxx.

◆ BuildStack()

void THStack::BuildStack ( )

protected

build sum of all histograms Build a separate list fStack containing the running sum of all histograms

Definition at line 387 of file THStack.cxx.

◆ DistancetoPrimitive()

Int_t THStack::DistancetoPrimitive	(	Int_t	px,
		Int_t	py
	)

virtual

Compute distance from point px,py to each graph.

Reimplemented from TObject.

Definition at line 410 of file THStack.cxx.

◆ Draw()

void THStack::Draw ( Option_t * option = "" )

virtual

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.

Reimplemented from TObject.

Definition at line 448 of file THStack.cxx.

◆ end()

TIter THStack::end ( ) const

inline

Definition at line 62 of file THStack.h.

◆ GetHistogram()

TH1 * THStack::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 NOTES

You must call Draw before calling this function. The returned histogram depends on the selected Draw options.
This function returns a pointer to an intermediate fixed bin size histogram used to set the range and for picking. You cannot use this histogram to return the bin information. You must get a pointer to one of the histograms in the stack, the first one, for example.

Definition at line 479 of file THStack.cxx.

◆ GetHists()

TList* THStack::GetHists ( ) const

inline

Definition at line 60 of file THStack.h.

◆ GetMaximum()

Double_t THStack::GetMaximum ( Option_t * option = "" )

virtual

returns the maximum of all added histograms returns the maximum of all histograms if option "nostack".

Definition at line 494 of file THStack.cxx.

◆ GetMinimum()

Double_t THStack::GetMinimum ( Option_t * option = "" )

virtual

returns the minimum of all added histograms returns the minimum of all histograms if option "nostack".

Definition at line 538 of file THStack.cxx.

◆ GetNhists()

Int_t THStack::GetNhists ( ) const

Return the number of histograms in the stack.

Definition at line 582 of file THStack.cxx.

◆ GetStack()

TObjArray * THStack::GetStack ( )

Return pointer to Stack. Build it if not yet done.

Definition at line 591 of file THStack.cxx.

◆ GetXaxis()

TAxis * THStack::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.

Definition at line 604 of file THStack.cxx.

◆ GetYaxis()

TAxis * THStack::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.

Definition at line 619 of file THStack.cxx.

◆ ls()

void THStack::ls ( Option_t * option = "" ) const

virtual

List histograms in the stack.

Reimplemented from TNamed.

Definition at line 630 of file THStack.cxx.

◆ Merge()

Long64_t THStack::Merge	(	TCollection *	li,
		TFileMergeInfo *	info
	)

virtual

Merge the THStack in the TList into this stack.

Returns the total number of histograms in the result or -1 in case of an error.

Definition at line 643 of file THStack.cxx.

◆ Modified()

void THStack::Modified ( )

virtual

invalidate sum of histograms

Definition at line 666 of file THStack.cxx.

◆ operator=()

THStack& THStack::operator= ( const THStack & )

private

◆ Paint()

void THStack::Paint ( Option_t * choptin = "" )

virtual

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 the option nostackb is specified histograms are all paint in the same pad next to each other as bar plots.

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.

By default the background of the histograms is erased before drawing the histograms. The option "noclear" avoid this behaviour. This is useful when drawing a THStack on top of an other plot. If the patterns used to draw the histograms in the stack are transparents, then the plot behind will be visible.

See THistPainter::Paint for a list of valid options.

Reimplemented from TObject.

Definition at line 700 of file THStack.cxx.

◆ Print()

void THStack::Print ( Option_t * chopt = "" ) const

virtual

Print the list of histograms.

Reimplemented from TNamed.

Definition at line 975 of file THStack.cxx.

◆ RecursiveRemove()

void THStack::RecursiveRemove ( TObject * obj )

virtual

Recursively remove object from the list of histograms.

Reimplemented from TObject.

Definition at line 989 of file THStack.cxx.

◆ SavePrimitive()

void THStack::SavePrimitive	(	std::ostream &	out,
		Option_t *	option = `""`
	)

virtual

Save primitive as a C++ statement(s) on output stream out.

Reimplemented from TObject.

Definition at line 999 of file THStack.cxx.

◆ SetHistogram()

virtual void THStack::SetHistogram ( TH1 * h )

inlinevirtual

Definition at line 76 of file THStack.h.

◆ SetMaximum()

void THStack::SetMaximum ( Double_t maximum = -1111 )

virtual

Set maximum.

Definition at line 1052 of file THStack.cxx.

◆ SetMinimum()

void THStack::SetMinimum ( Double_t minimum = -1111 )

virtual

Set minimum.

Definition at line 1061 of file THStack.cxx.

Member Data Documentation

◆ fHistogram

TH1* THStack::fHistogram

protected

Pointer to array of sums of TH1.

Definition at line 38 of file THStack.h.

◆ fHists

TList* THStack::fHists

protected

Definition at line 36 of file THStack.h.

◆ fMaximum

Double_t THStack::fMaximum

protected

Definition at line 39 of file THStack.h.

◆ fMinimum

Double_t THStack::fMinimum

protected

Definition at line 40 of file THStack.h.

◆ fStack

TObjArray* THStack::fStack

protected

Definition at line 37 of file THStack.h.

The documentation for this class was generated from the following files:

hist/hist/inc/THStack.h
hist/hist/src/THStack.cxx

Public Member Functions

Protected Member Functions

Protected Attributes

Private Member Functions

Additional Inherited Members

Constructor & Destructor Documentation

◆ THStack() [1/4]

◆ THStack() [2/4]

◆ THStack() [3/4]

◆ THStack() [4/4]

◆ ~THStack()

Member Function Documentation

◆ Add()

◆ begin()

◆ Browse()

◆ BuildStack()

◆ DistancetoPrimitive()

◆ Draw()

◆ end()

◆ GetHistogram()

◆ GetHists()

◆ GetMaximum()

◆ GetMinimum()

◆ GetNhists()

◆ GetStack()

◆ GetXaxis()

◆ GetYaxis()

◆ ls()

◆ Merge()

◆ Modified()

◆ operator=()

◆ Paint()

◆ Print()

◆ RecursiveRemove()

◆ SavePrimitive()

◆ SetHistogram()

◆ SetMaximum()

◆ SetMinimum()

Member Data Documentation

◆ fHistogram

◆ fHists

◆ fMaximum

◆ fMinimum

◆ fStack