Method xy2theta

include/patchwork/patchwork.hpp:777–788

template <typename PointT>
inline double PatchWork<PointT>::xy2theta(const double &x,
                                          const double &y) {  // 0 ~ 2 * PI
  /*
    if (y >= 0) {
        return atan2(y, x); // 1, 2 quadrant
    } else {
        return 2 * M_PI + atan2(y, x);// 3, 4 quadrant
    }
  */
  auto atan_value = atan2(y, x);                               // EDITED!
  return atan_value > 0 ? atan_value : atan_value + 2 * M_PI;  // EDITED!
}

template <typename PointT>
inline double PatchWork<PointT>::xy2radius(const double &x, const double &y) {