CGAL 6.1.1 - dD Frechet Distance

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Frechet_distance/parallel_Frechet_DS_2.cpp
#include <CGAL/Frechet_distance.h>
#include <CGAL/Frechet_distance_traits_2.h>
#include <CGAL/Frechet_distance/Neighbor_search.h>
#include <CGAL/Simple_cartesian.h>
#include <CGAL/IO/WKT.h>
#include <ostream>
#include <fstream>
#include <filesystem>
using Kernel = CGAL::Simple_cartesian<double>;
using Traits = CGAL::Frechet_distance_traits_2<Kernel>;
using Point = Traits::Point_d;
using Curve = std::vector<Point>;
using Curves = std::vector<Curve>;
int main()
{
Curves curves;
const std::filesystem::path data{"./data_2d"};
std::vector<std::string> filenames;
for (auto const& dir_entry : std::filesystem::directory_iterator{data}) {
filenames.push_back(dir_entry.path().string());
}
std::sort(filenames.begin(), filenames.end());
for (auto const& filename : filenames) {
std::cout << filename << std::endl;
std::ifstream in(filename);
curves.push_back(Curve());
CGAL::IO::read_linestring_WKT(in, curves.back());
}
// last curve is the query curve
Curve query = curves.back();
curves.pop_back();
using Neighbor_search = CGAL::Frechet_distance::Neighbor_search<Curve, Traits>;
Neighbor_search ds(curves, CGAL::Parallel_if_available_tag());
for(const Curve& c : curves){
std::pair<double, double> res = CGAL::bounded_error_Frechet_distance(c, query, 0.000001);
std::cout << "The Frechet distance between the polylines is between " << res.first << " and " << res.second << std::endl;
}
double distance = 16;
std::vector<std::size_t> result = ds.get_close_curves<CGAL::Parallel_if_available_tag>(query, distance);
std::cout << result.size() << " curves at Frechet distance closer than " << distance << std::endl;
}
CGAL::Frechet_distance::Neighbor_search
A data structure to store polylines with a function that enables to find those polylines which are cl...
Definition: Neighbor_search.h:44
CGAL::Frechet_distance_traits_2
Definition: Frechet_distance_traits_2.h:34
CGAL::bounded_error_Frechet_distance
std::pair< double, double > bounded_error_Frechet_distance(const PointRange &polyline1, const PointRange &polyline2, const double error_bound, const NamedParameters &np=parameters::default_values())
returns an estimate of the Fréchet distance between the two polylines that is at most error_bound awa...
Definition: Frechet_distance.h:173
CGAL::IO::read_linestring_WKT
bool read_linestring_WKT(std::istream &in, LineString &polyline)
Kernel
CGAL::Parallel_if_available_tag
CGAL::Simple_cartesian