Draw the ROOT Color Wheel.

The wheel contains the recommended 216 colors to be used in web applications. The colors in the Color Wheel are created by TColor::CreateColorWheel.

Using this color set for your text, background or graphics will give your application a consistent appearance across different platforms and browsers.

Colors are grouped by hue, the aspect most important in human perception. Touching color chips have the same hue, but with different brightness and vividness.

Colors of slightly different hues clash. If you intend to display colors of the same hue together, you should pick them from the same group.

Each color chip is identified by a mnemonic (e.g. kYellow) and a number. The keywords, kRed, kBlue, kYellow, kPink, etc are defined in the header file Rtypes.h that is included in all ROOT other header files. We strongly recommend to use these keywords in your code instead of hardcoded color numbers, e.g.:

myObject.SetFillColor(kRed);
myObject.SetFillColor(kYellow-10);
myLine.SetLineColor(kMagenta+2);

Definition at line 23 of file TColorWheel.h.

Public Member Functions
	TColorWheel ()
	constructor

	~TColorWheel () override
	destructor

Int_t	DistancetoPrimitive (Int_t px, Int_t py) override
	always return the color wheel

void	Draw (Option_t *option="") override
	Paint the color wheel.

TCanvas *	GetCanvas () const

virtual Int_t	GetColor (Int_t px, Int_t py) const
	Return the color number pointed by the mouse.

char *	GetObjectInfo (Int_t px, Int_t py) const override
	Return the color number pointed by the mouse.

TClass *	IsA () const override

void	Paint (Option_t *option="") override
	Paint the color wheel.

virtual void	SetCanvas (TCanvas *can)

void	Streamer (TBuffer &) override
	Stream an object of class TObject.

void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

Public Member Functions inherited from TNamed
	TNamed ()

	TNamed (const char name, const char title)

	TNamed (const TNamed &named)
	TNamed copy ctor.

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

virtual	~TNamed ()
	TNamed destructor.

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

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

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

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

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

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

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

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

TClass *	IsA () const override

Bool_t	IsSortable () const override

void	ls (Option_t *option="") const override
	List TNamed name and title.

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

void	Print (Option_t *option="") const override
	Print TNamed name and title.

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

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

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

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

void	Streamer (TBuffer &) override
	Stream an object of class TObject.

void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

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

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 with: `gROOT->SetSelectedPad(c1)`.

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=nullptr)
	Execute method on this object with the given parameter string, e.g.

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

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

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 Option_t *	GetOption () const

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.

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)

Bool_t	IsDestructed () const
	IsDestructed.

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

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).

virtual Bool_t	Notify ()
	This method must be overridden to handle object notification (the base implementation is no-op).

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, void vp)
	Only called by placement new when throwing an exception.

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

void	operator delete[] (void ptr, void vp)
	Only called by placement new[] when throwing an exception.

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 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.

void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

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=nullptr, Int_t option=0, Int_t bufsize=0)
	Write this object to the current directory.

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

Static Public Member Functions
static TClass *	Class ()

static const char *	Class_Name ()

static constexpr Version_t	Class_Version ()

static const char *	DeclFileName ()

Static Public Member Functions inherited from TNamed
static TClass *	Class ()

static const char *	Class_Name ()

static constexpr Version_t	Class_Version ()

static const char *	DeclFileName ()

Static Public Member Functions inherited from TObject
static TClass *	Class ()

static const char *	Class_Name ()

static constexpr Version_t	Class_Version ()

static const char *	DeclFileName ()

static Longptr_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 Member Functions
Int_t	InCircles (Double_t x, Double_t y, Int_t coffset, Double_t angle) const
	Return the color number when the mouse point to a circle.

Int_t	InGray (Double_t x, Double_t y) const
	Return the color number when the mouse point to the gray circle.

Int_t	InRectangles (Double_t x, Double_t y, Int_t coffset, Double_t angle) const
	Return the color number when the mouse point to a rectangle.

void	PaintCircle (Int_t coffset, Int_t n, Double_t x, Double_t y, Double_t ang) const
	Draw one color of type circle.

void	PaintCircles (Int_t coffset, Double_t angle) const
	Draw all colors of type circle.

void	PaintGray () const
	Draw the gray colors + white + black.

void	PaintRectangles (Int_t coffset, Double_t angle) const
	Draw all colors of type rectangle.

void	Rotate (Double_t x, Double_t y, Double_t &u, Double_t &v, Double_t ang) const
	Rotate point x,y with an angle=ang.

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 ()

Private Member Functions
	TColorWheel (const TColorWheel &)=delete

TColorWheel &	operator= (const TColorWheel &)=delete

Private Attributes
TArc *	fArc {nullptr}
	! pointer to utility arc

TCanvas *	fCanvas {nullptr}
	! Canvas used to draw the Color Wheel

Double_t	fDr {0.}
	Circles radius.

TGraph *	fGraph {nullptr}
	! pointer to utility graph

TLine *	fLine {nullptr}
	! pointer to utility line

Double_t	fR0 {0.}
	Minimum radius for circles.

Double_t	fRgray {0.}
	Maximum radius of gray circle.

Double_t	fRmax {0.}
	Maximum radius for rectangles.

Double_t	fRmin {0.}
	Minimum radius for rectangles.

TText *	fText {nullptr}
	! pointer to utility text

Double_t	fX [15]
	X coordinates of the center of circles.

Double_t	fY [15]
	Y coordinates of the center of circles.

Additional Inherited Members
Public Types inherited from TObject
enum	{ kIsOnHeap = 0x01000000 , kNotDeleted = 0x02000000 , kZombie = 0x04000000 , kInconsistent = 0x08000000 , kBitMask = 0x00ffffff }

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

enum	EDeprecatedStatusBits { kObjInCanvas = (1ULL << ( 3 )) }

enum	EStatusBits { kCanDelete = (1ULL << ( 0 )) , kMustCleanup = (1ULL << ( 3 )) , kIsReferenced = (1ULL << ( 4 )) , kHasUUID = (1ULL << ( 5 )) , kCannotPick = (1ULL << ( 6 )) , kNoContextMenu = (1ULL << ( 8 )) , kInvalidObject = (1ULL << ( 13 )) }

Protected Types inherited from TObject
enum	{ kOnlyPrepStep = (1ULL << ( 3 )) }

Protected Attributes inherited from TNamed
TString	fName

TString	fTitle

#include <TColorWheel.h>

Inheritance diagram for TColorWheel:

[legend]

Constructor & Destructor Documentation

◆ TColorWheel() [1/2]

TColorWheel::TColorWheel ( const TColorWheel & )

privatedelete

◆ TColorWheel() [2/2]

TColorWheel::TColorWheel ( )

constructor

Definition at line 65 of file TColorWheel.cxx.

◆ ~TColorWheel()

TColorWheel::~TColorWheel ( )

override

destructor

Definition at line 94 of file TColorWheel.cxx.

Member Function Documentation

◆ Class()

static TClass * TColorWheel::Class ( )

static

Returns: TClass describing this class

◆ Class_Name()

static const char * TColorWheel::Class_Name ( )

static

Returns: Name of this class

◆ Class_Version()

static constexpr Version_t TColorWheel::Class_Version ( )

inlinestaticconstexpr

Returns: Version of this class

Definition at line 63 of file TColorWheel.h.

◆ DeclFileName()

static const char * TColorWheel::DeclFileName ( )

inlinestatic

Returns: Name of the file containing the class declaration

Definition at line 63 of file TColorWheel.h.

◆ DistancetoPrimitive()

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

overridevirtual

always return the color wheel

Reimplemented from TObject.

Definition at line 106 of file TColorWheel.cxx.

◆ Draw()

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

overridevirtual

Paint the color wheel.

Reimplemented from TObject.

Definition at line 115 of file TColorWheel.cxx.

◆ GetCanvas()

TCanvas * TColorWheel::GetCanvas ( ) const

inline

Definition at line 57 of file TColorWheel.h.

◆ GetColor()

Int_t TColorWheel::GetColor	(	Int_t	px,
		Int_t	py
	)		const

virtual

Return the color number pointed by the mouse.

Definition at line 130 of file TColorWheel.cxx.

◆ GetObjectInfo()

char * TColorWheel::GetObjectInfo	(	Int_t	px,
		Int_t	py
	)		const

overridevirtual

Return the color number pointed by the mouse.

Reimplemented from TObject.

Definition at line 155 of file TColorWheel.cxx.

◆ InCircles()

Int_t TColorWheel::InCircles	(	Double_t	x,
		Double_t	y,
		Int_t	coffset,
		Double_t	angle
	)		const

protected

Return the color number when the mouse point to a circle.

Definition at line 177 of file TColorWheel.cxx.

◆ InGray()

Int_t TColorWheel::InGray	(	Double_t	x,
		Double_t	y
	)		const

protected

Return the color number when the mouse point to the gray circle.

Definition at line 194 of file TColorWheel.cxx.

◆ InRectangles()

Int_t TColorWheel::InRectangles	(	Double_t	x,
		Double_t	y,
		Int_t	coffset,
		Double_t	angle
	)		const

protected

Return the color number when the mouse point to a rectangle.

Definition at line 210 of file TColorWheel.cxx.

◆ IsA()

TClass * TColorWheel::IsA ( ) const

inlineoverridevirtual

Returns: TClass describing current object

Reimplemented from TObject.

Definition at line 63 of file TColorWheel.h.

◆ operator=()

TColorWheel & TColorWheel::operator= ( const TColorWheel & )

privatedelete

◆ Paint()

void TColorWheel::Paint ( Option_t * option = "" )

overridevirtual

Paint the color wheel.

Reimplemented from TObject.

Definition at line 225 of file TColorWheel.cxx.

◆ PaintCircle()

void TColorWheel::PaintCircle	(	Int_t	coffset,
		Int_t	n,
		Double_t	x,
		Double_t	y,
		Double_t	ang
	)		const

protected

Draw one color of type circle.

Definition at line 258 of file TColorWheel.cxx.

◆ PaintCircles()

void TColorWheel::PaintCircles	(	Int_t	coffset,
		Double_t	angle
	)		const

protected

Draw all colors of type circle.

Definition at line 279 of file TColorWheel.cxx.

◆ PaintGray()

void TColorWheel::PaintGray ( ) const

protected

Draw the gray colors + white + black.

Definition at line 389 of file TColorWheel.cxx.

◆ PaintRectangles()

void TColorWheel::PaintRectangles	(	Int_t	coffset,
		Double_t	angle
	)		const

protected

Draw all colors of type rectangle.

Definition at line 306 of file TColorWheel.cxx.

◆ Rotate()

void TColorWheel::Rotate	(	Double_t	x,
		Double_t	y,
		Double_t &	u,
		Double_t &	v,
		Double_t	ang
	)		const

protected

Rotate point x,y with an angle=ang.

Definition at line 428 of file TColorWheel.cxx.

◆ SetCanvas()

virtual void TColorWheel::SetCanvas ( TCanvas * can )

inlinevirtual

Definition at line 61 of file TColorWheel.h.

◆ Streamer()

void TColorWheel::Streamer ( TBuffer & R__b )

overridevirtual

Stream an object of class TObject.

Reimplemented from TObject.

◆ StreamerNVirtual()

void TColorWheel::StreamerNVirtual ( TBuffer & ClassDef_StreamerNVirtual_b )

inline

Definition at line 63 of file TColorWheel.h.

Member Data Documentation

◆ fArc

TArc* TColorWheel::fArc {nullptr}

private

! pointer to utility arc

Definition at line 34 of file TColorWheel.h.

◆ fCanvas

TCanvas* TColorWheel::fCanvas {nullptr}

private

! Canvas used to draw the Color Wheel

Definition at line 33 of file TColorWheel.h.

◆ fDr

Double_t TColorWheel::fDr {0.}

private

Circles radius.

Definition at line 29 of file TColorWheel.h.

◆ fGraph

TGraph* TColorWheel::fGraph {nullptr}

private

! pointer to utility graph

Definition at line 37 of file TColorWheel.h.

◆ fLine

TLine* TColorWheel::fLine {nullptr}

private

! pointer to utility line

Definition at line 35 of file TColorWheel.h.

◆ fR0

Double_t TColorWheel::fR0 {0.}

private

Minimum radius for circles.

Definition at line 28 of file TColorWheel.h.

◆ fRgray

Double_t TColorWheel::fRgray {0.}

private

Maximum radius of gray circle.

Definition at line 30 of file TColorWheel.h.

◆ fRmax

Double_t TColorWheel::fRmax {0.}

private

Maximum radius for rectangles.

Definition at line 27 of file TColorWheel.h.

◆ fRmin

Double_t TColorWheel::fRmin {0.}

private

Minimum radius for rectangles.

Definition at line 26 of file TColorWheel.h.

◆ fText

TText* TColorWheel::fText {nullptr}

private

! pointer to utility text

Definition at line 36 of file TColorWheel.h.

◆ fX

Double_t TColorWheel::fX[15]

private

X coordinates of the center of circles.

Definition at line 31 of file TColorWheel.h.

◆ fY

Double_t TColorWheel::fY[15]

private

Y coordinates of the center of circles.

Definition at line 32 of file TColorWheel.h.

Libraries for TColorWheel:

[legend]

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

graf2d/gpad/inc/TColorWheel.h
graf2d/gpad/src/TColorWheel.cxx

Public Member Functions

Static Public Member Functions

Protected Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Constructor & Destructor Documentation

◆ TColorWheel() [1/2]

◆ TColorWheel() [2/2]

◆ ~TColorWheel()

Member Function Documentation

◆ Class()

◆ Class_Name()

◆ Class_Version()

◆ DeclFileName()

◆ DistancetoPrimitive()

◆ Draw()

◆ GetCanvas()

◆ GetColor()

◆ GetObjectInfo()

◆ InCircles()

◆ InGray()

◆ InRectangles()

◆ IsA()

◆ operator=()

◆ Paint()

◆ PaintCircle()

◆ PaintCircles()

◆ PaintGray()

◆ PaintRectangles()

◆ Rotate()

◆ SetCanvas()

◆ Streamer()

◆ StreamerNVirtual()

Member Data Documentation

◆ fArc

◆ fCanvas

◆ fDr

◆ fGraph

◆ fLine

◆ fR0

◆ fRgray

◆ fRmax

◆ fRmin

◆ fText

◆ fX

◆ fY