wscvt_sampler.hpp

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#pragma once
 
#include "mini_map.hpp"
#include "spherical_voronoi.hpp"
#include "utils_math.hpp"
 
namespace netdem {
 
class WSCVTSampler {
public:
  int max_iters{10000};
 
  double tol{1.0e-4};
 
  WSCVTSampler(const WSCVTSampler &) = delete;
 
  WSCVTSampler &operator=(const WSCVTSampler &) = delete;
 
  static WSCVTSampler &GetInstance() {
    static WSCVTSampler instance;
    return instance;
  }
 
  VecXT<Vec3d> Get(int num_samples, bool new_random = false) {
    VecXT<Vec3d> samples;
    if (new_random) {
      samples = Create(num_samples);
      if (samples_map.find(num_samples) == samples_map.end()) {
        samples_map[num_samples] = samples;
      }
    } else {
      if (samples_map.find(num_samples) == samples_map.end()) {
        samples = Create(num_samples);
        samples_map[num_samples] = samples;
      } else {
        samples = samples_map[num_samples];
      }
    }
    return samples;
  }
 
private:
  WSCVTSampler() {}
 
  MiniMap<int, VecXT<Vec3d>> samples_map;
 
  VecXT<Vec3d> Create(int num_samples) {
    return SphericalVoronoi::Solve(num_samples, max_iters, tol);
  }
};
 
} // namespace netdem