Fill Area Attributes class.

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

Fill Area attributes

Fill Area attributes are:

Fill Area color

The fill area color is a color index (integer) pointing in the ROOT color table. The fill area color of any class inheriting from TAttFill can be changed using the method SetFillColor and retrieved using the method GetFillColor. The following table shows the first 50 default colors.

Color transparency

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

histo->SetFillColorAlpha(kBlue, 0.35);

kBlue

@ kBlue

Definition Rtypes.h:66

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.

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 (eg 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, eg:

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

Special case forcing black&white output.

If the current style fill area color is set to 0, then ROOT will force a black&white output for all objects with a fill area defined and independently of the object fill style.

Fill Area style

The fill area style defines the pattern used to fill a polygon. The fill area style of any class inheriting from TAttFill can be changed using the method SetFillStyle and retrieved using the method GetFillStyle.

Conventions for fill styles:

0 : hollow
1001 : Solid
3000+pattern_number (see below)
For TPad only:
- 4000 :the window is transparent.
- 4000 to 4100 the window is 100% transparent to 100% opaque.
  
  The pad transparency is visible in binary outputs files like gif, jpg, png etc .. but not in vector graphics output files like PS, PDF and SVG. This convention (fill style > 4000) is kept for backward compatibility. It is better to use the color transparency instead.

pattern_number can have any value from 1 to 25 (see table), or any value from 100 to 999. For the latest the numbering convention is the following:

pattern_number = ijk      (FillStyle = 3ijk)
 
i (1-9) : specify the space between each hatch
          1 = 1/2mm  9 = 6mm
 
j (0-9) : specify angle between 0 and 90 degrees
          0 = 0
          1 = 10
          2 = 20
          3 = 30
          4 = 45
          5 = Not drawn
          6 = 60
          7 = 70
          8 = 80
          9 = 90
 
k (0-9) : specify angle between 90 and 180 degrees
          0 = 180
          1 = 170
          2 = 160
          3 = 150
          4 = 135
          5 = Not drawn
          6 = 120
          7 = 110
          8 = 100
          9 = 90

The following table shows the list of pattern styles. The first table displays the 25 fixed patterns. They cannot be customized unlike the hatches displayed in the second table which be customized using:

gStyle->SetHatchesSpacing() to define the spacing between hatches.
gStyle->SetHatchesLineWidth() to define the hatches line width.

Definition at line 19 of file TAttFill.h.

Public Member Functions
	TAttFill ()
	AttFill default constructor.

	TAttFill (Color_t fcolor, Style_t fstyle)
	AttFill normal constructor.

virtual	~TAttFill ()
	AttFill destructor.

void	Copy (TAttFill &attfill) const
	Copy this fill attributes to a new TAttFill.

virtual Color_t	GetFillColor () const
	Return the fill area color.

virtual Style_t	GetFillStyle () const
	Return the fill area style.

virtual Bool_t	IsTransparent () const

virtual void	Modify ()
	Change current fill area attributes if necessary.

virtual void	ResetAttFill (Option_t *option="")
	Reset this fill attributes to default values.

virtual void	SaveFillAttributes (std::ostream &out, const char *name, Int_t coldef=1, Int_t stydef=1001)
	Save fill attributes as C++ statement(s) on output stream out.

virtual void	SetFillAttributes ()
	Invoke the DialogCanvas Fill attributes.

virtual void	SetFillColor (Color_t fcolor)
	Set the fill area color.

virtual void	SetFillColorAlpha (Color_t fcolor, Float_t falpha)
	Set a transparent fill color.

virtual void	SetFillStyle (Style_t fstyle)
	Set the fill area style.

Protected Attributes
Color_t	fFillColor
	Fill area color.

Style_t	fFillStyle
	Fill area style.

#include <TAttFill.h>

Inheritance diagram for TAttFill:

[legend]

Constructor & Destructor Documentation

◆ TAttFill() [1/2]

TAttFill::TAttFill ( )

AttFill default constructor.

Default fill attributes are taking from the current style

Definition at line 176 of file TAttFill.cxx.

◆ TAttFill() [2/2]

TAttFill::TAttFill	(	Color_t	color,
		Style_t	style
	)

AttFill normal constructor.

color Fill Color
style Fill Style

Definition at line 188 of file TAttFill.cxx.

◆ ~TAttFill()

TAttFill::~TAttFill ( )

virtual

AttFill destructor.

Definition at line 197 of file TAttFill.cxx.

Member Function Documentation

◆ Copy()

void TAttFill::Copy ( TAttFill & attfill ) const

Copy this fill attributes to a new TAttFill.

Definition at line 204 of file TAttFill.cxx.

◆ GetFillColor()

virtual Color_t TAttFill::GetFillColor ( ) const

inlinevirtual

Return the fill area color.

Reimplemented in TGWin32VirtualXProxy, TGraphMultiErrors, and TWebPadPainter.

Definition at line 30 of file TAttFill.h.

◆ GetFillStyle()

virtual Style_t TAttFill::GetFillStyle ( ) const

inlinevirtual

Return the fill area style.

Reimplemented in TGWin32VirtualXProxy, TGraphMultiErrors, and TWebPadPainter.

Definition at line 31 of file TAttFill.h.

◆ IsTransparent()

Bool_t TAttFill::IsTransparent ( ) const

inlinevirtual

Reimplemented in TGWin32VirtualXProxy, and TWebPadPainter.

Definition at line 44 of file TAttFill.h.

◆ Modify()

void TAttFill::Modify ( )

virtual

Change current fill area attributes if necessary.

Definition at line 213 of file TAttFill.cxx.

◆ ResetAttFill()

void TAttFill::ResetAttFill ( Option_t * option = "" )

virtual

Reset this fill attributes to default values.

Reimplemented in TGWin32VirtualXProxy.

Definition at line 227 of file TAttFill.cxx.

◆ SaveFillAttributes()

void TAttFill::SaveFillAttributes	(	std::ostream &	out,
		const char *	name,
		Int_t	coldef = `1`,
		Int_t	stydef = `1001`
	)

virtual

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

Definition at line 236 of file TAttFill.cxx.

◆ SetFillAttributes()

void TAttFill::SetFillAttributes ( )

virtual

Invoke the DialogCanvas Fill attributes.

Reimplemented in TGWin32VirtualXProxy.

Definition at line 253 of file TAttFill.cxx.

◆ SetFillColor()

virtual void TAttFill::SetFillColor ( Color_t fcolor )

inlinevirtual

Set the fill area color.

Reimplemented in TVirtualX, TGQuartz, TGWin32, TGWin32VirtualXProxy, TGX11, TPDF, TPostScript, TSVG, TTeXDump, TSpider, TGraphMultiErrors, and TWebPadPainter.

Definition at line 37 of file TAttFill.h.

◆ SetFillColorAlpha()

void TAttFill::SetFillColorAlpha	(	Color_t	fcolor,
		Float_t	falpha
	)

virtual

Set a transparent fill color.

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

Reimplemented in TGraphMultiErrors.

Definition at line 262 of file TAttFill.cxx.

◆ SetFillStyle()

virtual void TAttFill::SetFillStyle ( Style_t fstyle )

inlinevirtual

Set the fill area style.

Reimplemented in TGraphMultiErrors, TPad, TWebPadPainter, TSpider, TVirtualX, TGQuartz, TGWin32, TGWin32VirtualXProxy, and TGX11.

Definition at line 39 of file TAttFill.h.

Member Data Documentation

◆ fFillColor

Color_t TAttFill::fFillColor

protected

Fill area color.

Definition at line 22 of file TAttFill.h.

◆ fFillStyle

Style_t TAttFill::fFillStyle

protected

Fill area style.

Definition at line 23 of file TAttFill.h.

core/base/inc/TAttFill.h

core/base/src/TAttFill.cxx

Fill Area attributes

Fill Area color

Color transparency

The ROOT Color Wheel.

Special case forcing black&white output.

Fill Area style

Conventions for fill styles:

Public Member Functions

Protected Attributes

Constructor & Destructor Documentation

◆ TAttFill() [1/2]

◆ TAttFill() [2/2]

◆ ~TAttFill()

Member Function Documentation

◆ Copy()

◆ GetFillColor()

◆ GetFillStyle()

◆ IsTransparent()

◆ Modify()

◆ ResetAttFill()

◆ SaveFillAttributes()

◆ SetFillAttributes()

◆ SetFillColor()

◆ SetFillColorAlpha()

◆ SetFillStyle()

Member Data Documentation

◆ fFillColor

◆ fFillStyle