Belle II Software development
Static Public Member Functions | List of all members
Colors Class Reference

Utility functions related to colors. More...

#include <Colors.h>

Static Public Member Functions

static std::vector< std::string > getList ()
 Get a list of useful colors.
 
static double hueToRgb (double p, double q, double t)
 Transforms a Color given in the HLS System to RGB.
 
static std::array< double, 3 > hlsToRgb (double h, double l, double s)
 Transforms a Color given in the HLS System to RGB.
 
static std::string getWheelColor (int degree)
 Get a color from the wheel of colors.
 

Detailed Description

Utility functions related to colors.

Definition at line 22 of file Colors.h.

Member Function Documentation

◆ getList()

std::vector< std::string > getList ( )
static

Get a list of useful colors.

Definition at line 15 of file Colors.cc.

16{
17 return {
18 "red",
19 "blue",
20 "green",
21 "orangered",
22 "cyan",
23 "olive",
24 "maroon",
25 "turquoise",
26 "lime",
27 "teal",
28 "darkgreen",
29 "indigo",
30 "darkolivegreen",
31 "orange",
32 "darkmagenta",
33 "seagreen",
34 "magenta",
35 "midnightblue",
36 "darkgoldenrod"
37 };
38}

◆ getWheelColor()

std::string getWheelColor ( int  degree)
static

Get a color from the wheel of colors.

Parameters
degreethe degree viewed form the center of the color wheel (greater 0)

Definition at line 71 of file Colors.cc.

72{
73 double hue(degree % 360 / 360.);
74 double saturation = 0.75;
75 double lightness = 0.5;
76
77 std::array<double, 3> rgb = Colors::hlsToRgb(hue, lightness, saturation);
78 std::ostringstream oss;
79 oss << "rgb(" << rgb[0] * 100 << "%, " << rgb[1] * 100 << "%, " << rgb[2] * 100 << "%)";
80 return oss.str();
81}
Belle2::TrackFindingCDC::Colors::hlsToRgb
static std::array< double, 3 > hlsToRgb(double h, double l, double s)
Transforms a Color given in the HLS System to RGB.
Definition: Colors.cc:56

◆ hlsToRgb()

std::array< double, 3 > hlsToRgb ( double  h,
double  l,
double  s 
)
static

Transforms a Color given in the HLS System to RGB.

Parameters
hHue ranging from 0 to 1.
lLighness.
sSaturation.
Returns
Array containing rgb-values in the order red, green, blue.

Definition at line 56 of file Colors.cc.

57{
58 if (s == 0) {
59 return {l, l, l};
60 } else {
61 double q = l < 0.5 ? l * (1 + s) : l + s - l * s;
62 double p = 2 * l - q;
63 return {
64 hueToRgb(p, q, h + 1. / 3.), //r
65 hueToRgb(p, q, h), //g
66 hueToRgb(p, q, h - 1. / 3.) //b
67 };
68 }
69}
Belle2::TrackFindingCDC::Colors::hueToRgb
static double hueToRgb(double p, double q, double t)
Transforms a Color given in the HLS System to RGB.
Definition: Colors.cc:40

◆ hueToRgb()

double hueToRgb ( double  p,
double  q,
double  t 
)
static

Transforms a Color given in the HLS System to RGB.

Definition at line 40 of file Colors.cc.

41{
42 while (t < 0) t += 1;
43 while (t > 1) t -= 1;
44 if (t < 1. / 6.) {
45 return p + (q - p) * 6 * t;
46 }
47 if (t < 1. / 2.) {
48 return q;
49 }
50 if (t < 2. / 3.) {
51 return p + (q - p) * (2. / 3. - t) * 6;
52 }
53 return p;
54}
The documentation for this class was generated from the following files: