TAttMarker Class Reference

Marker Attributes class.

This class is used (in general by secondary inheritance) by many other classes (graphics, histograms). It holds all the markers attributes.

Marker attributes

The marker attributes are:

• Marker color
• Marker style
• Marker size

Marker color

The marker color is a color index (integer) pointing in the ROOT color table. The marker color of any class inheriting from TAttMarker can be changed using the method SetMarkerColor and retrieved using the method GetMarkerColor. The following table shows the first 50 default colors.

Color transparency

SetMarkerColorAlpha(), allows to set a transparent color. In the following example the marker color of the histogram histo is set to blue with a transparency of 35%. The color kBlue itself remains fully opaque.

histo->SetMarkerColorAlpha(kBlue, 0.35);

The transparency is available on all platforms when the flag OpenGL.CanvasPreferGL is set to 1 in $ROOTSYS/etc/system.rootrc, or on Mac with the Cocoa backend. On the file output it is visible with PDF, PNG, Gif, JPEG, SVG, TeX ... but not PostScript.

Marker style

The Marker style defines the markers' shape. The marker style of any class inheriting from TAttMarker can be changed using the method SetMarkerStyle and retrieved using the method GetMarkerStyle.

The following list gives the currently supported markers (screen and PostScript) style. Each marker style is identified by an integer number (first column) corresponding to a marker shape (second column) and can be also accessed via a global name (third column).

Marker number         Marker shape          Marker name
     1                    dot                  kDot
     2                    +                    kPlus
     3                    *                    kStar
     4                    o                    kCircle
     5                    x                    kMultiply
     6                    small dot            kFullDotSmall
     7                    medium dot           kFullDotMedium
     8                    large scalable dot   kFullDotLarge
     9 -->19              large scalable dot
    20                    full circle          kFullCircle
    21                    full square          kFullSquare
    22                    full triangle up     kFullTriangleUp
    23                    full triangle down   kFullTriangleDown
    24                    open circle          kOpenCircle
    25                    open square          kOpenSquare
    26                    open triangle up     kOpenTriangleUp
    27                    open diamond         kOpenDiamond
    28                    open cross           kOpenCross
    29                    full star            kFullStar
    30                    open star            kOpenStar
    31                    *
    32                    open triangle down   kOpenTriangleDown
    33                    full diamond         kFullDiamond
    34                    full cross           kFullCross
    35                    open diamond cross   kOpenDiamondCross
    36                    open square diagonal kOpenSquareDiagonal
    37                    open three triangle  kOpenThreeTriangles
    38                    octagon with cross   kOctagonCross
    39                    full three trangles  kFullThreeTriangles
    40                    open four triangleX  kOpenFourTrianglesX
    41                    full four triangleX  kFullFourTrianglesX
    42                    open double diamond  kOpenDoubleDiamond
    43                    full double diamond  kFullDoubleDiamond
    44                    open four triangle+  kOpenFourTrianglesPlus
    45                    full four triangle+  kFullFourTrianglesPlus
    46                    open cross X         kOpenCrossX
    47                    full cross X         kFullCrossX
    48                    four squares X       kFourSquaresX
    49                    four squares+        kFourSquaresPlus

Marker size

Various marker sizes are shown in the figure below. The default marker size=1 is shown in the top left corner. Marker sizes smaller than 1 can be specified. The marker size does not refer to any coordinate systems, it is an absolute value. Therefore the marker size is not affected by any change in TPad's scale. A marker size equal to 1 correspond to 8 pixels. That is, a square marker with size 1 will be drawn with a side equal to 8 pixels on the screen.

The marker size of any class inheriting from TAttMarker can be changed using the method SetMarkerSize and retrieved using the method GetMarkerSize.

Note that the marker styles number 1 6 and 7 (the dots), cannot be scaled. They are meant to be very fast to draw and are always drawn with the same number of pixels; therefore SetMarkerSize does not apply on them. To have a "scalable dot" a filled circle should be used instead, i.e. the marker style number 20. By default (if SetMarkerStyle is not specified), the marker style used is 1. That's the most common one to draw scatter plots.

Definition at line 19 of file TAttMarker.h.

Public Member Functions
	TAttMarker ()
	TAttMarker default constructor. More...
	TAttMarker (Color_t color, Style_t style, Size_t msize)
	TAttMarker normal constructor. More...
virtual	~TAttMarker ()
	TAttMarker destructor. More...
void	Copy (TAttMarker &attmarker) const
	Copy this marker attributes to a new TAttMarker. More...
virtual Color_t	GetMarkerColor () const
	Return the marker color. More...
virtual Size_t	GetMarkerSize () const
	Return the marker size. More...
virtual Style_t	GetMarkerStyle () const
	Return the marker style. More...
virtual void	Modify ()
	Change current marker attributes if necessary. More...
virtual void	ResetAttMarker (Option_t *toption="")
	Reset this marker attributes to the default values. More...
virtual void	SaveMarkerAttributes (std::ostream &out, const char *name, Int_t coldef=1, Int_t stydef=1, Int_t sizdef=1)
	Save line attributes as C++ statement(s) on output stream out. More...
virtual void	SetMarkerAttributes ()
	Invoke the DialogCanvas Marker attributes. More...
virtual void	SetMarkerColor (Color_t mcolor=1)
	Set the marker color. More...
virtual void	SetMarkerColorAlpha (Color_t mcolor, Float_t malpha)
	Set a transparent marker color. More...
virtual void	SetMarkerSize (Size_t msize=1)
	Set the marker size. More...
virtual void	SetMarkerStyle (Style_t mstyle=1)
	Set the marker style. More...

Protected Attributes
Color_t	fMarkerColor
	Marker color. More...
Size_t	fMarkerSize
	Marker size. More...
Style_t	fMarkerStyle
	Marker style. More...

#include <TAttMarker.h>

Inheritance diagram for TAttMarker:

Constructor & Destructor Documentation

TAttMarker() [1/2]

TAttMarker::TAttMarker

(

)

TAttMarker default constructor.

Default text attributes are taking from the current style.

Definition at line 177 of file TAttMarker.cxx.

TAttMarker() [2/2]

TAttMarker::TAttMarker	(	Color_t	color,
		Style_t	style,
		Size_t	msize
	)

TAttMarker normal constructor.

Text attributes are taking from the argument list

• color : Marker Color Index
• style : Marker style (from 1 to 30)
• size : marker size (float)

Definition at line 193 of file TAttMarker.cxx.

~TAttMarker()

TAttMarker::~TAttMarker ( )

virtual

TAttMarker destructor.

Definition at line 203 of file TAttMarker.cxx.

Member Function Documentation

Copy()

void TAttMarker::Copy

(

TAttMarker &

attmarker

)

const

Copy this marker attributes to a new TAttMarker.

Definition at line 210 of file TAttMarker.cxx.

GetMarkerColor()

virtual Color_t TAttMarker::GetMarkerColor ( ) const

inlinevirtual

Return the marker color.

Reimplemented in TGWin32VirtualXProxy.

Definition at line 31 of file TAttMarker.h.

GetMarkerSize()

virtual Size_t TAttMarker::GetMarkerSize ( ) const

inlinevirtual

Return the marker size.

Reimplemented in TGWin32VirtualXProxy.

Definition at line 33 of file TAttMarker.h.

GetMarkerStyle()

virtual Style_t TAttMarker::GetMarkerStyle ( ) const

inlinevirtual

Return the marker style.

Reimplemented in TGWin32VirtualXProxy.

Definition at line 32 of file TAttMarker.h.

Modify()

void TAttMarker::Modify ( )

virtual

Change current marker attributes if necessary.

Definition at line 220 of file TAttMarker.cxx.

ResetAttMarker()

void TAttMarker::ResetAttMarker ( Option_t *  toption = "" )

virtual

Reset this marker attributes to the default values.

Reimplemented in TGWin32VirtualXProxy.

Definition at line 235 of file TAttMarker.cxx.

SaveMarkerAttributes()

void TAttMarker::SaveMarkerAttributes ( std::ostream &  out, const char *  name, Int_t  coldef = 1, Int_t  stydef = 1, Int_t  sizdef = 1  )

virtual

Save line attributes as C++ statement(s) on output stream out.

Definition at line 245 of file TAttMarker.cxx.

SetMarkerAttributes()

void TAttMarker::SetMarkerAttributes ( )

virtual

Invoke the DialogCanvas Marker attributes.

Reimplemented in TGWin32VirtualXProxy.

Definition at line 265 of file TAttMarker.cxx.

SetMarkerColor()

virtual void TAttMarker::SetMarkerColor ( Color_t  mcolor = 1 )

inlinevirtual

Set the marker color.

Reimplemented in TEveTrackList, ROOT::Experimental::REveTrackList, TVirtualX, TGQuartz, TGWin32, TGWin32VirtualXProxy, TGX11, TPDF, TPostScript, TSVG, TTeXDump, TEveLine, TEvePointSet, ROOT::Experimental::REveLine, ROOT::Experimental::REvePointSet, TEvePointSetArray, and ROOT::Experimental::REvePointSetArray.

Definition at line 38 of file TAttMarker.h.

SetMarkerColorAlpha()

void TAttMarker::SetMarkerColorAlpha ( Color_t  mcolor, Float_t  malpha  )

virtual

Set a transparent marker color.

malpha defines the percentage of the color opacity from 0. (fully transparent) to 1. (fully opaque).

Definition at line 274 of file TAttMarker.cxx.

SetMarkerSize()

virtual void TAttMarker::SetMarkerSize ( Size_t  msize = 1 )

inlinevirtual

Set the marker size.

Reimplemented in TVirtualX, TGQuartz, TGWin32, TGWin32VirtualXProxy, TGX11, TTeXDump, TEvePointSet, TEvePointSetArray, ROOT::Experimental::REvePointSet, ROOT::Experimental::REvePointSetArray, TEveTrackList, and ROOT::Experimental::REveTrackList.

Definition at line 41 of file TAttMarker.h.

SetMarkerStyle()

virtual void TAttMarker::SetMarkerStyle ( Style_t  mstyle = 1 )

inlinevirtual

Set the marker style.

Reimplemented in TVirtualX, TGQuartz, TGWin32, TGWin32VirtualXProxy, TGX11, TEvePointSet, TEvePointSetArray, ROOT::Experimental::REvePointSet, ROOT::Experimental::REvePointSetArray, TEveTrackList, and ROOT::Experimental::REveTrackList.

Definition at line 40 of file TAttMarker.h.

Member Data Documentation

fMarkerColor

Color_t TAttMarker::fMarkerColor

protected

Marker color.

Definition at line 22 of file TAttMarker.h.

fMarkerSize

Size_t TAttMarker::fMarkerSize

protected

Marker size.

Definition at line 24 of file TAttMarker.h.

fMarkerStyle

Style_t TAttMarker::fMarkerStyle

protected

Marker style.

Definition at line 23 of file TAttMarker.h.

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

• core/base/inc/TAttMarker.h
• core/base/src/TAttMarker.cxx