The histogram painter class using OpenGL.

Histograms are, by default, drawn via the THistPainter class. TGLHistPainter allows to paint them using the OpenGL 3D graphics library. The plotting options provided by TGLHistPainter start with GL keyword.

General information: plot types and supported options

The following types of plots are provided:

Lego - (`TGLLegoPainter`)

The supported options are:

"GLLEGO" : Draw a lego plot.
"GLLEGO2" : Bins with color levels.
"GLLEGO3" : Cylindrical bars.

Lego painter in cartesian supports logarithmic scales for X, Y, Z. In polar only Z axis can be logarithmic, in cylindrical only Y (if you see what it means).

Surfaces (`TF2` and `TH2` with `"GLSURF"` options) - (`TGLSurfacePainter`)

The supported options are:

"GLSURF" : Draw a surface.
"GLSURF1" : Surface with color levels
"GLSURF2" : The same as "GLSURF1" but without polygon outlines.
"GLSURF3" : Color level projection on top of plot (works only in cartesian coordinate system).
"GLSURF4" : Same as "GLSURF" but without polygon outlines.

The surface painting in cartesian coordinates supports logarithmic scales along X, Y, Z axis. In polar coordinates only the Z axis can be logarithmic, in cylindrical coordinates only the Y axis.

Additional options to `SURF` and `LEGO` - Coordinate systems:

The supported options are:

" " : Default, cartesian coordinates system.
"POL" : Polar coordinates system.
"CYL" : Cylindrical coordinates system.
"SPH" : Spherical coordinates system.

`TH3` as boxes (spheres) - (`TGLBoxPainter`)

The supported options are:

"GLBOX" : TH3 as a set of boxes, size of box is proportional to bin content.
"GLBOX1": the same as "glbox", but spheres are drawn instead of boxes.

`TH3` as iso-surface(s) - (`TGLIsoPainter`)

The supported option is:

"GLISO" : TH3 is drawn using iso-surfaces.

`TH3` as color boxes - (`TGLVoxelPainter`)

The supported option is:

"GLCOL" : TH3 is drawn using semi-transparent colored boxes. See $ROOTSYS/tutorials/gl/glvox1.C.

`TF3` (implicit function) - (`TGLTF3Painter`)

The supported option is:

"GLTF3" : Draw a TF3.

Parametric surfaces - (`TGLParametricPlot`)

$ROOTSYS/tutorials/gl/glparametric.C shows how to create parametric equations and visualize the surface.

Interaction with the plots

General information.

All the interactions are implemented via standard methods DistancetoPrimitive and ExecuteEvent. That's why all the interactions with the OpenGL plots are possible i only when the mouse cursor is in the plot's area (the plot's area is the part of a the pad occupied by gl-produced picture). If the mouse cursor is not above gl-picture, the standard pad interaction is performed.

Selectable parts.

Different parts of the plot can be selected:

xoz, yoz, xoy back planes: When such a plane selected, it's highlighted in green if the dynamic slicing by this plane is supported, and it's highlighted in red, if the dynamic slicing is not supported. -*The plot itself*: On surfaces, the selected surface is outlined in red. (TF3 and ISO are not outlined). On lego plots, the selected bin is highlihted. The bin number and content are displayed in pad's status bar. In box plots, the box or sphere is highlighted and the bin info is displayed in pad's status bar.

Rotation and zooming.

Rotation:

When the plot is selected, it can be rotated by pressing and holding the left mouse button and move the cursor.

Zoom/Unzoom:

Mouse wheel or ‘'j’,'J','k','K'` keys.

Panning.

The selected plot can be moved in a pad's area by pressing and holding the left mouse button and the shift key.

Box cut

Surface, iso, box, TF3 and parametric painters support box cut by pressing the ‘'c’or 'C'` key when the mouse cursor is in a plot's area. That will display a transparent box, cutting away part of the surface (or boxes) in order to show internal part of plot. This box can be moved inside the plot's area (the full size of the box is equal to the plot's surrounding box) by selecting one of the box cut axes and pressing the left mouse button to move it.

Plot specific interactions (dynamic slicing etc.)

Currently, all gl-plots support some form of slicing. When back plane is selected (and if it's highlighted in green) you can press and hold left mouse button and shift key and move this back plane inside plot's area, creating the slice. During this "slicing" plot becomes semi-transparent. To remove all slices (and projected curves for surfaces)

double click with left mouse button in a plot's area.

Surface with option `"GLSURF"`

The surface profile is displayed on the slicing plane. The profile projection is drawn on the back plane by pressing ‘'p’or'P'` key.

TF3

The contour plot is drawn on the slicing plane. For TF3 the color scheme can be changed by pressing ‘'s’or'S'`.

Box

The contour plot corresponding to slice plane position is drawn in real time.

Iso

Slicing is similar to "GLBOX" option.

Parametric plot

No slicing. Additional keys: ‘'s’or'S'to change color scheme - about 20 color schemes supported ('s'for "scheme");'l'or'L'to increase number of polygons ('l'for "level" of details), 'w'or'W'to show outlines ('w'` for "wireframe").

Definition at line 40 of file TGLHistPainter.h.

Public Member Functions
	TGLHistPainter (TGL5DDataSet *data)
	This ctor creates plot painter for TGL5DDataSet.

	TGLHistPainter (TGLParametricEquation *equation)
	This ctor creates gl-parametric plot's painter.

	TGLHistPainter (TGLTH3Composition *comp)
	This ctor creates plot painter for TGL5DDataSet.

	TGLHistPainter (TH1 *hist)
	ROOT does not use exceptions, so, if default painter's creation failed, fDefaultPainter is 0.

Int_t	DistancetoPrimitive (Int_t px, Int_t py)
	Selects plot or axis.

void	DrawPanel ()
	Default implementation is OK This function is called from a context menu after right click on a plot's area.

void	ExecuteEvent (Int_t event, Int_t px, Int_t py)
	Execute event.

TList *	GetContourList (Double_t contour) const
	Get contour list.

char *	GetObjectInfo (Int_t px, Int_t py) const
	Overrides TObject::GetObjectInfo.

TGLPlotPainter *	GetRealPainter ()

TList *	GetStack () const
	Get stack.

Bool_t	IsInside (Double_t x, Double_t y)
	Returns kTRUE if the cell x, y is inside one of the graphical cuts.

Bool_t	IsInside (Int_t x, Int_t y)
	Returns kTRUE if the cell ix, iy is inside one of the graphical cuts.

Int_t	MakeCuts (char *cutsOpt)
	Make cuts.

void	Paint (Option_t *option)
	Final-overrider for TObject::Paint.

void	PaintStat (Int_t dostat, TF1 *fit)
	Paint statistics.

void	ProcessMessage (const char message, const TObject obj)
	Process message.

void	SetHighlight ()
	Set highlight mode.

void	SetHistogram (TH1 *hist)
	Set histogram.

void	SetShowProjection (const char *option, Int_t nbins)
	Set show projection.

void	SetStack (TList *stack)
	Set stack.

Public Member Functions inherited from TVirtualHistPainter
	TVirtualHistPainter ()

virtual	~TVirtualHistPainter ()

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

	TObject (const TObject &object)
	TObject copy ctor.

virtual	~TObject ()
	TObject destructor.

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

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

virtual void	Browse (TBrowser *b)
	Browse object. May be overridden for another default action.

ULong_t	CheckedHash ()
	Check and record whether this class has a consistent Hash/RecursiveRemove setup (*) and then return the regular Hash value for this object.

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

virtual void	Clear (Option_t *="")

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

virtual Int_t	Compare (const TObject *obj) const
	Compare abstract method.

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

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

virtual void	Draw (Option_t *option="")
	Default Draw method for all objects.

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

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

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

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

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.

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

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

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

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

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

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

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

virtual Option_t *	GetOption () const

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

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

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

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

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.

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

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

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

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

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).

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

R__ALWAYS_INLINE Bool_t	IsOnHeap () const

virtual Bool_t	IsSortable () const

R__ALWAYS_INLINE Bool_t	IsZombie () const

virtual void	ls (Option_t *option="") const
	The ls function lists the contents of a class on stdout.

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).

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

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

void	operator delete (void *ptr)
	Operator delete.

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

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.

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

virtual void	Print (Option_t *option="") const
	This method must be overridden when a class wants to print itself.

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

virtual void	RecursiveRemove (TObject *obj)
	Recursively remove this object from a list.

void	ResetBit (UInt_t f)

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

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

void	SetBit (UInt_t f)

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

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

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

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

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.

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

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

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

Private Member Functions
	TGLHistPainter (const TGLHistPainter &)

void	CreatePainter (const PlotOption_t &parsed, const TString &option)
	Create painter.

TGLHistPainter &	operator= (const TGLHistPainter &)

void	PadToViewport (Bool_t selectionPass=kFALSE)

PlotOption_t	ParsePaintOption (const TString &option) const
	In principle, we can have several conflicting options: "lego surf pol sph", surfbb: surf, fb, bb.

Private Attributes
TGLPlotCamera	fCamera

TGLPlotCoordinates	fCoord

std::unique_ptr< TVirtualHistPainter >	fDefaultPainter

TGLParametricEquation *	fEq

TF3 *	fF3

std::unique_ptr< TGLPlotPainter >	fGLPainter

TH1 *	fHist

EGLPlotType	fPlotType

TList *	fStack

Additional Inherited Members
Public Types inherited from TObject
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) }

Static Public Member Functions inherited from TVirtualHistPainter
static TVirtualHistPainter *	HistPainter (TH1 *obj)
	Static function returning a pointer to the current histogram painter.

static void	SetPainter (const char *painter)
	Static function to set an alternative histogram painter.

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

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

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

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

Protected Types inherited from TObject
enum	{ kOnlyPrepStep = BIT(3) }

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).

void	MakeZombie ()

#include <TGLHistPainter.h>

Inheritance diagram for TGLHistPainter:

[legend]

Constructor & Destructor Documentation

◆ TGLHistPainter() [1/5]

TGLHistPainter::TGLHistPainter ( TH1 * hist )

ROOT does not use exceptions, so, if default painter's creation failed, fDefaultPainter is 0.

In each function, which use it, I have to check the pointer first.

Definition at line 201 of file TGLHistPainter.cxx.

◆ TGLHistPainter() [2/5]

TGLHistPainter::TGLHistPainter ( TGLParametricEquation * equation )

This ctor creates gl-parametric plot's painter.

Definition at line 214 of file TGLHistPainter.cxx.

◆ TGLHistPainter() [3/5]

TGLHistPainter::TGLHistPainter ( TGL5DDataSet * data )

This ctor creates plot painter for TGL5DDataSet.

Definition at line 227 of file TGLHistPainter.cxx.

◆ TGLHistPainter() [4/5]

TGLHistPainter::TGLHistPainter ( TGLTH3Composition * comp )

This ctor creates plot painter for TGL5DDataSet.

Definition at line 240 of file TGLHistPainter.cxx.

◆ TGLHistPainter() [5/5]

TGLHistPainter::TGLHistPainter ( const TGLHistPainter & )

private

Member Function Documentation

◆ CreatePainter()

void TGLHistPainter::CreatePainter	(	const PlotOption_t &	parsed,
		const TString &	option
	)

private

Create painter.

Definition at line 699 of file TGLHistPainter.cxx.

◆ DistancetoPrimitive()

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

virtual

Selects plot or axis.

9999 is the magic number, ROOT's classes use in DistancetoPrimitive.

General information: plot types and supported options

Lego - (TGLLegoPainter)

Surfaces (TF2 and TH2 with "GLSURF" options) - (TGLSurfacePainter)

Additional options to SURF and LEGO - Coordinate systems:

TH3 as boxes (spheres) - (TGLBoxPainter)

TH3 as iso-surface(s) - (TGLIsoPainter)

TH3 as color boxes - (TGLVoxelPainter)

TF3 (implicit function) - (TGLTF3Painter)

Parametric surfaces - (TGLParametricPlot)

Interaction with the plots

General information.

Selectable parts.

Rotation and zooming.

Panning.

Box cut

Plot specific interactions (dynamic slicing etc.)

Surface with option "GLSURF"

TF3

Box

Iso

Parametric plot

Public Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Constructor & Destructor Documentation

◆ TGLHistPainter() [1/5]

◆ TGLHistPainter() [2/5]

◆ TGLHistPainter() [3/5]

◆ TGLHistPainter() [4/5]

◆ TGLHistPainter() [5/5]

Member Function Documentation

◆ CreatePainter()

◆ DistancetoPrimitive()

◆ DrawPanel()

◆ ExecuteEvent()

◆ GetContourList()

◆ GetObjectInfo()

◆ GetRealPainter()

◆ GetStack()

◆ IsInside() [1/2]

◆ IsInside() [2/2]

◆ MakeCuts()

◆ operator=()

◆ PadToViewport()

◆ Paint()

◆ PaintStat()

◆ ParsePaintOption()

◆ ProcessMessage()

◆ SetHighlight()

◆ SetHistogram()

◆ SetShowProjection()

◆ SetStack()

Member Data Documentation

◆ fCamera

◆ fCoord

◆ fDefaultPainter

◆ fEq

◆ fF3

◆ fGLPainter

◆ fHist

◆ fPlotType

◆ fStack

Lego - (`TGLLegoPainter`)

Surfaces (`TF2` and `TH2` with `"GLSURF"` options) - (`TGLSurfacePainter`)

Additional options to `SURF` and `LEGO` - Coordinate systems:

`TH3` as boxes (spheres) - (`TGLBoxPainter`)

`TH3` as iso-surface(s) - (`TGLIsoPainter`)

`TH3` as color boxes - (`TGLVoxelPainter`)

`TF3` (implicit function) - (`TGLTF3Painter`)

Parametric surfaces - (`TGLParametricPlot`)

Surface with option `"GLSURF"`