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ROOT 6.14/05 Reference Guide |
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;
A more complex example:
Note that picking is supported for all drawing modes.
Automatic coloring according to the current palette is available as shown in the following example:
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... | |
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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 () |
TNamed destructor. More... | |
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... | |
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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... | |
ULong_t | CheckedHash () |
Checked and record whether for this class has a consistent Hash/RecursiveRemove setup (*) and then return the regular Hash value for this object. 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... | |
Bool_t | HasInconsistentHash () const |
Return true is the type of this object is known to have an inconsistent setup for Hash and RecursiveRemove (i.e. 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... | |
R__ALWAYS_INLINE Bool_t | IsOnHeap () const |
R__ALWAYS_INLINE 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... | |
R__ALWAYS_INLINE 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... | |
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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 |
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TString | fName |
TString | fTitle |
Private Member Functions | |
THStack & | operator= (const THStack &) |
Additional Inherited Members | |
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enum | { kIsOnHeap = 0x01000000, kNotDeleted = 0x02000000, kZombie = 0x04000000, kInconsistent = 0x08000000, kBitMask = 0x00ffffff } |
enum | { kSingleKey = BIT(0), kOverwrite = BIT(1), kWriteDelete = BIT(2) } |
enum | EDeprecatedStatusBits { kObjInCanvas = BIT(3) } |
enum | EStatusBits { kCanDelete = BIT(0), kMustCleanup = BIT(3), kIsReferenced = BIT(4), kHasUUID = BIT(5), kCannotPick = BIT(6), kNoContextMenu = BIT(8), kInvalidObject = BIT(13) } |
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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>
THStack::THStack | ( | ) |
THStack default constructor.
Definition at line 113 of file THStack.cxx.
THStack::THStack | ( | const char * | name, |
const char * | title | ||
) |
constructor with name and title
Definition at line 125 of file THStack.cxx.
THStack::THStack | ( | TH1 * | hist, |
Option_t * | axis = "x" , |
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const char * | name = 0 , |
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const char * | title = 0 , |
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Int_t | firstbin = 1 , |
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Int_t | lastbin = -1 , |
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Int_t | firstbin2 = 1 , |
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Int_t | lastbin2 = -1 , |
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Option_t * | proj_option = "" , |
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Option_t * | draw_option = "" |
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) |
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:
Definition at line 167 of file THStack.cxx.
THStack::THStack | ( | const THStack & | hstack | ) |
THStack copy constructor.
Definition at line 339 of file THStack.cxx.
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virtual |
THStack destructor.
Definition at line 320 of file THStack.cxx.
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 359 of file THStack.cxx.
TIter THStack::begin | ( | ) | const |
Get iterator over internal hists list.
Definition at line 1067 of file THStack.cxx.
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protected |
build sum of all histograms Build a separate list fStack containing the running sum of all histograms
Definition at line 384 of file THStack.cxx.
Compute distance from point px,py to each graph.
Reimplemented from TObject.
Definition at line 407 of file THStack.cxx.
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 445 of file THStack.cxx.
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
Definition at line 476 of file THStack.cxx.
returns the maximum of all added histograms returns the maximum of all histograms if option "nostack".
Definition at line 491 of file THStack.cxx.
returns the minimum of all added histograms returns the minimum of all histograms if option "nostack".
Definition at line 535 of file THStack.cxx.
Int_t THStack::GetNhists | ( | ) | const |
Return the number of histograms in the stack.
Definition at line 579 of file THStack.cxx.
TObjArray * THStack::GetStack | ( | ) |
Return pointer to Stack. Build it if not yet done.
Definition at line 588 of file THStack.cxx.
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 601 of file THStack.cxx.
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 616 of file THStack.cxx.
List histograms in the stack.
Reimplemented from TNamed.
Definition at line 627 of file THStack.cxx.
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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 640 of file THStack.cxx.
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virtual |
invalidate sum of histograms
Definition at line 663 of file THStack.cxx.
Paint the list of histograms.
By default, histograms are shown stacked.
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 697 of file THStack.cxx.
Print the list of histograms.
Reimplemented from TNamed.
Definition at line 972 of file THStack.cxx.
Recursively remove object from the list of histograms.
Reimplemented from TObject.
Definition at line 986 of file THStack.cxx.
Save primitive as a C++ statement(s) on output stream out.
Reimplemented from TObject.
Definition at line 996 of file THStack.cxx.
Set maximum.
Definition at line 1049 of file THStack.cxx.
Set minimum.
Definition at line 1058 of file THStack.cxx.
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protected |