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Reference Guide
TColor.h
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1 // @(#)root/base:$Id$
2 // Author: Rene Brun 12/12/94
3 
4 /*************************************************************************
5  * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *
6  * All rights reserved. *
7  * *
8  * For the licensing terms see $ROOTSYS/LICENSE. *
9  * For the list of contributors see $ROOTSYS/README/CREDITS. *
10  *************************************************************************/
11 
12 #ifndef ROOT_TColor
13 #define ROOT_TColor
14 
15 #include "TNamed.h"
16 #include "TArrayI.h"
17 
18 
19 class TColor : public TNamed {
20 protected:
21  Int_t fNumber; ///< Color number identifier
22 private:
23  Float_t fRed; ///< Fraction of Red
24  Float_t fGreen; ///< Fraction of Green
25  Float_t fBlue; ///< Fraction of Blue
26  Float_t fHue; ///< Hue
27  Float_t fLight; ///< Light
28  Float_t fSaturation; ///< Saturation
29  Float_t fAlpha; ///< Alpha (transparency)
30 
31  void Allocate();
32  static Float_t HLStoRGB1(Float_t rn1, Float_t rn2, Float_t huei);
33 
34 public:
35  TColor();
36  TColor(Int_t color, Float_t r, Float_t g, Float_t b, const char *name="", Float_t a = 1);
38  TColor(const TColor &color);
39  virtual ~TColor();
40  const char *AsHexString() const;
41  void Copy(TObject &color) const;
42  static void CreateColorWheel();
43  static void CreateColorsGray();
44  static void CreateColorsCircle(Int_t offset, const char *name, UChar_t *rgb);
45  static void CreateColorsRectangle(Int_t offset, const char *name, UChar_t *rgb);
46  static Int_t CreateGradientColorTable(UInt_t Number, Double_t* Stops,
47  Double_t* Red, Double_t* Green, Double_t* Blue, UInt_t NColors, Float_t alpha=1.);
48  static Int_t GetColorPalette(Int_t i);
49  static Int_t GetNumberOfColors();
50  virtual void GetRGB(Float_t &r, Float_t &g, Float_t &b) const
51  { r=GetRed(); g=GetGreen(); b=GetBlue(); }
52  virtual void GetHLS(Float_t &h, Float_t &l, Float_t &s) const
53  { h=GetHue(); l=GetLight(); s=GetSaturation(); }
54  Int_t GetNumber() const { return fNumber; }
55  ULong_t GetPixel() const;
56  Float_t GetRed() const { return IsGrayscale() ? GetGrayscale() : fRed; }
57  Float_t GetGreen() const { return IsGrayscale() ? GetGrayscale() : fGreen; }
58  Float_t GetBlue() const { return IsGrayscale() ? GetGrayscale() : fBlue; }
59  Float_t GetHue() const { return fHue; }
60  Float_t GetLight() const { return fLight; }
61  Float_t GetSaturation() const { return IsGrayscale() ? 0 : fSaturation; }
62  Float_t GetAlpha() const { return fAlpha; }
63  virtual Float_t GetGrayscale() const { /*ITU*/ return 0.299f*fRed + 0.587f*fGreen + 0.114f*fBlue; }
64  virtual void ls(Option_t *option="") const;
65  virtual void Print(Option_t *option="") const;
66  virtual void SetAlpha(Float_t a) { fAlpha = a; }
67  virtual void SetRGB(Float_t r, Float_t g, Float_t b);
68 
69  static void InitializeColors();
70  static void HLS2RGB(Float_t h, Float_t l, Float_t s, Float_t &r, Float_t &g, Float_t &b);
71  static void HLS2RGB(Int_t h, Int_t l, Int_t s, Int_t &r, Int_t &g, Int_t &b);
72  static void HLStoRGB(Float_t h, Float_t l, Float_t s, Float_t &r, Float_t &g, Float_t &b)
73  { TColor::HLS2RGB(h, l, s, r, g, b); } // backward compatible
74  static void HSV2RGB(Float_t h, Float_t s, Float_t v, Float_t &r, Float_t &g, Float_t &b);
75  static void RGB2HLS(Float_t r, Float_t g, Float_t b, Float_t &h, Float_t &l, Float_t &s);
76  static void RGB2HLS(Int_t r, Int_t g, Int_t b, Int_t &h, Int_t &l, Int_t &s);
77  static void RGBtoHLS(Float_t r, Float_t g, Float_t b, Float_t &h, Float_t &l, Float_t &s)
78  { TColor::RGB2HLS(r, g, b, h, l, s); } // backward compatible
79  static void RGB2HSV(Float_t r, Float_t g, Float_t b, Float_t &h, Float_t &s, Float_t &v);
80  static Int_t GetColor(const char *hexcolor);
81  static Int_t GetColor(Float_t r, Float_t g, Float_t b);
82  static Int_t GetColor(Int_t r, Int_t g, Int_t b);
83  static Int_t GetColor(ULong_t pixel);
84  static Int_t GetColorBright(Int_t color);
85  static Int_t GetColorDark(Int_t color);
86  static Int_t GetColorTransparent(Int_t color, Float_t a);
87  static Int_t GetFreeColorIndex();
88  static ULong_t Number2Pixel(Int_t ci);
89  static ULong_t RGB2Pixel(Int_t r, Int_t g, Int_t b);
90  static ULong_t RGB2Pixel(Float_t r, Float_t g, Float_t b);
91  static void Pixel2RGB(ULong_t pixel, Int_t &r, Int_t &g, Int_t &b);
92  static void Pixel2RGB(ULong_t pixel, Float_t &r, Float_t &g, Float_t &b);
93  static const char *PixelAsHexString(ULong_t pixel);
94  static void SaveColor(std::ostream &out, Int_t ci);
95  static Bool_t IsGrayscale();
96  static void SetGrayscale(Bool_t set = kTRUE);
97  static void SetPalette(Int_t ncolors, Int_t *colors,Float_t alpha=1.);
98 
99  ClassDef(TColor,2) //Color defined by RGB or HLS
100 };
101 
109  kBrownCyan=72, kCMYK=73, kCandy=74,
115  kNeon=90, kPastel=91, kPearl=92,
116  kPigeon=93, kPlum=94, kRedBlue=95,
118  kSienna=99, kSolar=100, kSouthWest=101,
121  kWaterMelon=108, kCool=109, kCopper=110,
122  kGistEarth=111, kViridis=112};
123 #endif
124 
static void HSV2RGB(Float_t h, Float_t s, Float_t v, Float_t &r, Float_t &g, Float_t &b)
Static method to compute RGB from HSV:
Definition: TColor.cxx:1461
Float_t fBlue
Fraction of Blue.
Definition: TColor.h:25
virtual void SetAlpha(Float_t a)
Definition: TColor.h:66
static Bool_t IsGrayscale()
Return whether all colors return grayscale values.
Definition: TColor.cxx:2060
Float_t GetRed() const
Definition: TColor.h:56
Float_t fHue
Hue.
Definition: TColor.h:26
virtual Float_t GetGrayscale() const
Definition: TColor.h:63
float Float_t
Definition: RtypesCore.h:53
Definition: TColor.h:117
const char Option_t
Definition: RtypesCore.h:62
static Int_t GetColorDark(Int_t color)
Static function: Returns the dark color number corresponding to n If the TColor object does not exist...
Definition: TColor.cxx:1849
Float_t GetAlpha() const
Definition: TColor.h:62
EColorPalette
Definition: TColor.h:102
TH1 * h
Definition: legend2.C:5
static void SaveColor(std::ostream &out, Int_t ci)
Save a color with index > 228 as a C++ statement(s) on output stream out.
Definition: TColor.cxx:2022
static Int_t GetFreeColorIndex()
Static function: Returns a free color index which can be used to define a user custom color...
Definition: TColor.cxx:1906
static void RGB2HSV(Float_t r, Float_t g, Float_t b, Float_t &h, Float_t &s, Float_t &v)
Static method to compute HSV from RGB.
Definition: TColor.cxx:1593
Definition: TColor.h:115
static Int_t GetNumberOfColors()
Static function returning number of colors in the color palette.
Definition: TColor.cxx:1368
Definition: TColor.h:113
Float_t GetLight() const
Definition: TColor.h:60
int Int_t
Definition: RtypesCore.h:41
bool Bool_t
Definition: RtypesCore.h:59
TArc * a
Definition: textangle.C:12
static void HLStoRGB(Float_t h, Float_t l, Float_t s, Float_t &r, Float_t &g, Float_t &b)
Definition: TColor.h:72
virtual void GetRGB(Float_t &r, Float_t &g, Float_t &b) const
Definition: TColor.h:50
Float_t GetBlue() const
Definition: TColor.h:58
Float_t fAlpha
Alpha (transparency)
Definition: TColor.h:29
static void SetPalette(Int_t ncolors, Int_t *colors, Float_t alpha=1.)
Static function.
Definition: TColor.cxx:2317
static const char * PixelAsHexString(ULong_t pixel)
Convert machine dependent pixel value (obtained via RGB2Pixel or via Number2Pixel() or via TColor::Ge...
Definition: TColor.cxx:2010
static Int_t GetColorPalette(Int_t i)
Static function returning the color number i in current palette.
Definition: TColor.cxx:1356
#define ClassDef(name, id)
Definition: Rtypes.h:297
Float_t GetGreen() const
Definition: TColor.h:57
The TNamed class is the base class for all named ROOT classes.
Definition: TNamed.h:29
Definition: TColor.h:111
Definition: TColor.h:117
Float_t fLight
Light.
Definition: TColor.h:27
Float_t fGreen
Fraction of Green.
Definition: TColor.h:24
virtual void GetHLS(Float_t &h, Float_t &l, Float_t &s) const
Definition: TColor.h:52
static ULong_t RGB2Pixel(Int_t r, Int_t g, Int_t b)
Convert r,g,b to graphics system dependent pixel value.
Definition: TColor.cxx:1955
virtual void Print(Option_t *option="") const
Dump this color with its attributes.
Definition: TColor.cxx:1526
virtual ~TColor()
Color destructor.
Definition: TColor.cxx:1030
Definition: TColor.h:116
static void RGB2HLS(Float_t r, Float_t g, Float_t b, Float_t &h, Float_t &l, Float_t &s)
Static method to compute HLS from RGB.
Definition: TColor.cxx:1535
void Copy(TObject &color) const
Copy this color to obj.
Definition: TColor.cxx:1196
static void RGBtoHLS(Float_t r, Float_t g, Float_t b, Float_t &h, Float_t &l, Float_t &s)
Definition: TColor.h:77
static void HLS2RGB(Float_t h, Float_t l, Float_t s, Float_t &r, Float_t &g, Float_t &b)
Static method to compute RGB from HLS.
Definition: TColor.cxx:1395
static Int_t GetColorBright(Int_t color)
Static function: Returns the bright color number corresponding to n If the TColor object does not exi...
Definition: TColor.cxx:1817
Float_t GetSaturation() const
Definition: TColor.h:61
TRandom2 r(17)
SVector< double, 2 > v
Definition: Dict.h:5
Float_t fSaturation
Saturation.
Definition: TColor.h:28
static void CreateColorsRectangle(Int_t offset, const char *name, UChar_t *rgb)
Create the "rectangular" colors in the color wheel.
Definition: TColor.cxx:1248
ULong_t GetPixel() const
Return pixel value corresponding to this color.
Definition: TColor.cxx:1378
unsigned int UInt_t
Definition: RtypesCore.h:42
Definition: TColor.h:114
TLine * l
Definition: textangle.C:4
static Int_t GetColor(const char *hexcolor)
Static method returning color number for color specified by hex color string of form: "#rrggbb"...
Definition: TColor.cxx:1707
Definition: TColor.h:121
TColor()
Default constructor.
Definition: TColor.cxx:957
Definition: TColor.h:105
Definition: TColor.h:109
static Int_t GetColorTransparent(Int_t color, Float_t a)
Static function: Returns the transparent color number corresponding to n.
Definition: TColor.cxx:1880
Int_t fNumber
Color number identifier.
Definition: TColor.h:21
static void CreateColorWheel()
Static function steering the creation of all colors in the color wheel.
Definition: TColor.cxx:1268
static ULong_t Number2Pixel(Int_t ci)
Static method that given a color index number, returns the corresponding pixel value.
Definition: TColor.cxx:1917
Color * colors
Definition: X3DBuffer.c:19
Definition: TColor.h:109
double Double_t
Definition: RtypesCore.h:55
unsigned long ULong_t
Definition: RtypesCore.h:51
static void CreateColorsGray()
Create the Gray scale colors in the Color Wheel.
Definition: TColor.cxx:1212
virtual void SetRGB(Float_t r, Float_t g, Float_t b)
Initialize this color and its associated colors.
Definition: TColor.cxx:1646
Definition: TColor.h:115
The color creation and management class.
Definition: TColor.h:19
Definition: TColor.h:108
Definition: TColor.h:118
Float_t fRed
Fraction of Red.
Definition: TColor.h:23
Mother of all ROOT objects.
Definition: TObject.h:37
Definition: TColor.h:106
static void SetGrayscale(Bool_t set=kTRUE)
Set whether all colors should return grayscale values.
Definition: TColor.cxx:2068
static void CreateColorsCircle(Int_t offset, const char *name, UChar_t *rgb)
Create the "circle" colors in the color wheel.
Definition: TColor.cxx:1228
you should not use this method at all Int_t Int_t Double_t Double_t Double_t Int_t Double_t Double_t Double_t Double_t b
Definition: TRolke.cxx:630
Int_t GetNumber() const
Definition: TColor.h:54
virtual void ls(Option_t *option="") const
List this color with its attributes.
Definition: TColor.cxx:1517
Definition: TColor.h:104
static void InitializeColors()
Initialize colors used by the TCanvas based graphics (via TColor objects).
Definition: TColor.cxx:1049
unsigned char UChar_t
Definition: RtypesCore.h:34
void Allocate()
Make this color known to the graphics system.
Definition: TColor.cxx:1692
const char * AsHexString() const
Return color as hexadecimal string.
Definition: TColor.cxx:1175
const Bool_t kTRUE
Definition: RtypesCore.h:91
static Int_t CreateGradientColorTable(UInt_t Number, Double_t *Stops, Double_t *Red, Double_t *Green, Double_t *Blue, UInt_t NColors, Float_t alpha=1.)
Static function creating a color table with several connected linear gradients.
Definition: TColor.cxx:2129
static Float_t HLStoRGB1(Float_t rn1, Float_t rn2, Float_t huei)
Static method. Auxiliary to HLS2RGB().
Definition: TColor.cxx:1420
static void Pixel2RGB(ULong_t pixel, Int_t &r, Int_t &g, Int_t &b)
Convert machine dependent pixel value (obtained via RGB2Pixel or via Number2Pixel() or via TColor::Ge...
Definition: TColor.cxx:1993
Float_t GetHue() const
Definition: TColor.h:59