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Reference Guide
List of all members | Public Member Functions | Protected Attributes | List of all members

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.

pict1_TAttFill_001.png

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);

The transparency is available on all platforms when the flagOpenGL.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);
pict1_TAttFill_002.png

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:

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:

pict1_TAttFill_003.png

Definition at line 19 of file TAttFill.h.

Public Member Functions

 TAttFill ()
 AttFill default constructor. More...
 
 TAttFill (Color_t fcolor, Style_t fstyle)
 AttFill normal constructor. More...
 
virtual ~TAttFill ()
 AttFill destructor. More...
 
void Copy (TAttFill &attfill) const
 Copy this fill attributes to a new TAttFill. More...
 
virtual Color_t GetFillColor () const
 Return the fill area color. More...
 
virtual Style_t GetFillStyle () const
 Return the fill area style. More...
 
virtual Bool_t IsTransparent () const
 
virtual void Modify ()
 Change current fill area attributes if necessary. More...
 
virtual void ResetAttFill (Option_t *option="")
 Reset this fill attributes to default values. More...
 
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. More...
 
virtual void SetFillAttributes ()
 Invoke the DialogCanvas Fill attributes. More...
 
virtual void SetFillColor (Color_t fcolor)
 Set the fill area color. More...
 
virtual void SetFillColorAlpha (Color_t fcolor, Float_t falpha)
 Set a transparent fill color. More...
 
virtual void SetFillStyle (Style_t fstyle)
 Set the fill area style. More...
 

Protected Attributes

Color_t fFillColor
 Fill area color. More...
 
Style_t fFillStyle
 Fill area style. More...
 

#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 175 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 187 of file TAttFill.cxx.

◆ ~TAttFill()

TAttFill::~TAttFill ( )
virtual

AttFill destructor.

Definition at line 196 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 203 of file TAttFill.cxx.

◆ GetFillColor()

virtual Color_t TAttFill::GetFillColor ( ) const
inlinevirtual

Return the fill area color.

Reimplemented in TGWin32VirtualXProxy.

Definition at line 30 of file TAttFill.h.

◆ GetFillStyle()

virtual Style_t TAttFill::GetFillStyle ( ) const
inlinevirtual

Return the fill area style.

Reimplemented in TGWin32VirtualXProxy.

Definition at line 31 of file TAttFill.h.

◆ IsTransparent()

Bool_t TAttFill::IsTransparent ( ) const
inlinevirtual

Reimplemented in TGWin32VirtualXProxy.

Definition at line 44 of file TAttFill.h.

◆ Modify()

void TAttFill::Modify ( )
virtual

Change current fill area attributes if necessary.

Definition at line 212 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 226 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 235 of file TAttFill.cxx.

◆ SetFillAttributes()

void TAttFill::SetFillAttributes ( )
virtual

Invoke the DialogCanvas Fill attributes.

Reimplemented in TGWin32VirtualXProxy.

Definition at line 252 of file TAttFill.cxx.

◆ SetFillColor()

virtual void TAttFill::SetFillColor ( Color_t  fcolor)
inlinevirtual

Set the fill area color.

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

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).

Definition at line 261 of file TAttFill.cxx.

◆ SetFillStyle()

virtual void TAttFill::SetFillStyle ( Style_t  fstyle)
inlinevirtual

Set the fill area style.

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

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.


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