Colors.cc

/**************************************************************************
 * basf2 (Belle II Analysis Software Framework)                           *
 * Author: The Belle II Collaboration                                     *
 *                                                                        *
 * See git log for contributors and copyright holders.                    *
 * This file is licensed under LGPL-3.0, see LICENSE.md.                  *
 **************************************************************************/
#include <tracking/trackFindingCDC/display/Colors.h>
 
#include <sstream>
 
using namespace Belle2;
using namespace TrackFindingCDC;
 
std::vector<std::string> Colors::getList()
{
  return {
    "red",
    "blue",
    "green",
    "orangered",
    "cyan",
    "olive",
    "maroon",
    "turquoise",
    "lime",
    "teal",
    "darkgreen",
    "indigo",
    "darkolivegreen",
    "orange",
    "darkmagenta",
    "seagreen",
    "magenta",
    "midnightblue",
    "darkgoldenrod"
  };
}
 
double Colors::hueToRgb(const double p, const double q, double t)
{
  while (t < 0) t += 1;
  while (t > 1) t -= 1;
  if (t < 1. / 6.) {
    return p + (q - p) * 6 * t;
  }
  if (t < 1. / 2.) {
    return q;
  }
  if (t < 2. / 3.) {
    return p + (q - p) * (2. / 3. - t) * 6;
  }
  return p;
}
 
std::array<double, 3> Colors::hlsToRgb(const double h, const double l, const double s)
{
  if (s == 0) {
    return {l, l, l};
  } else {
    double q = l < 0.5 ? l * (1 + s) : l + s - l * s;
    double p = 2 * l - q;
    return {
      hueToRgb(p, q, h + 1. / 3.), //r
      hueToRgb(p, q, h),           //g
      hueToRgb(p, q, h - 1. / 3.)  //b
    };
  }
}
 
std::string Colors::getWheelColor(int degree)
{
  double hue(degree % 360 / 360.);
  double saturation = 0.75;
  double lightness = 0.5;
 
  std::array<double, 3> rgb = Colors::hlsToRgb(hue, lightness, saturation);
  std::ostringstream oss;
  oss << "rgb(" << rgb[0] * 100 << "%, " << rgb[1] * 100 << "%, " << rgb[2] * 100 << "%)";
  return oss.str();
}