PuOr.h

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#ifndef TATOOINE_COLOR_SCALES_PUOR_H
#define TATOOINE_COLOR_SCALES_PUOR_H
//==============================================================================
#include <tatooine/concepts.h>
#include <tatooine/vec.h>
 
#include <memory>
//==============================================================================
namespace tatooine::color_scales {
//==============================================================================
template <floating_point Real>
struct PuOr {
  using real_type  = Real;
  using this_type  = PuOr<Real>;
  using color_type = vec<Real, 3>;
  static constexpr std::size_t num_samples() { return 17; }
  //==============================================================================
 private:
  std::unique_ptr<color_type[]> m_data;
 
 public:
  auto data_container() -> color_type* { return m_data; }
  auto data_container() const -> color_type const* { return m_data; }
  auto data() -> color_type* { return m_data.get(); }
  auto data() const -> color_type const* { return m_data.get(); }
  //==============================================================================
  PuOr()
      : m_data{new color_type[]{
            {0.49803900000000001, 0.231373, 0.031372999999999998},
            {0.62599000000000005, 0.30273, 0.026450999999999999},
            {0.74694300000000002, 0.38708199999999998, 0.037524000000000002},
            {0.85767000000000004, 0.490427, 0.071971999999999994},
            {0.93640900000000005, 0.61776200000000003, 0.236371},
            {0.99269499999999999, 0.74309899999999995, 0.43291000000000002},
            {0.99515600000000004, 0.84152300000000002, 0.63714000000000004},
            {0.98531299999999999, 0.913802, 0.81368700000000005},
            {0.96624399999999999, 0.96639799999999998, 0.96770500000000004},
            {0.88996500000000001, 0.89503999999999995, 0.93817799999999996},
            {0.80615099999999995, 0.80430599999999997, 0.89465600000000001},
            {0.71264899999999998, 0.68865799999999999, 0.83314100000000002},
            {0.59423300000000001, 0.55432499999999996, 0.74463699999999999},
            {0.47489399999999998, 0.404229, 0.65236400000000005},
            {0.36662800000000001, 0.217224, 0.56378300000000003},
            {0.26643600000000001, 0.089965000000000003, 0.43483300000000003},
            {0.17647099999999999, 0, 0.29411799999999999}}} {}
  //----------------------------------------------------------------------------
  auto sample(real_type t) const {
    if (t <= 0) {
      return m_data[0];
    }
    if (t >= 1) {
      return m_data[(num_samples() - 1)];
    }
    t *= num_samples() - 1;
    auto const i = static_cast<std::size_t>(std::floor(t));
    t            = t - i;
    return m_data[i] * (1 - t) + m_data[i + 1] * t;
  }
  auto operator()(real_type const t) const { return sample(t); }
};
//==============================================================================
PuOr()->PuOr<real_number>;
//==============================================================================
}  // namespace tatooine::color_scales
//==============================================================================
#endif