mirror of https://github.com/CGAL/cgal
51 lines
1.6 KiB
C++
51 lines
1.6 KiB
C++
#include <CGAL/Frechet_distance.h>
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#include <CGAL/Frechet_distance_traits_2.h>
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#include <CGAL/Frechet_distance/Neighbor_search.h>
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#include <CGAL/Simple_cartesian.h>
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#include <CGAL/IO/WKT.h>
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#include <ostream>
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#include <fstream>
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#include <filesystem>
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using Kernel = CGAL::Simple_cartesian<double>;
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using Traits = CGAL::Frechet_distance_traits_2<Kernel>;
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using Point = Traits::Point_d;
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using Curve = std::vector<Point>;
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using Curves = std::vector<Curve>;
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int main()
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{
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Curves curves;
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const std::filesystem::path data{"./data_2d"};
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std::vector<std::string> filenames;
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for (auto const& dir_entry : std::filesystem::directory_iterator{data}) {
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filenames.push_back(dir_entry.path());
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}
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std::sort(filenames.begin(), filenames.end());
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for (auto const& filename : filenames) {
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std::cout << filename << std::endl;
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std::ifstream in(filename);
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curves.push_back(Curve());
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CGAL::IO::read_linestring_WKT(in, curves.back());
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}
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// last curve is the query curve
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Curve query = curves.back();
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curves.pop_back();
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CGAL::Frechet_distance::Neighbor_search<Curve, Traits> ds;
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ds.insert(curves);
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for(const Curve& c : curves){
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std::pair<double, double> res = CGAL::bounded_error_Frechet_distance(c, query, 0.000001);
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std::cout << "The Frechet distance between the polylines is between " << res.first << " and " << res.second << std::endl;
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}
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double distance = 16;
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std::vector<std::size_t> result = ds.get_close_curves(query, distance);
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std::cout << result.size() << " curves at Frechet distance closer than " << distance << std::endl;
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}
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