diff options
Diffstat (limited to 'src/Spatial_searching/example/example_spatial_searching.cpp')
-rw-r--r-- | src/Spatial_searching/example/example_spatial_searching.cpp | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/src/Spatial_searching/example/example_spatial_searching.cpp b/src/Spatial_searching/example/example_spatial_searching.cpp new file mode 100644 index 00000000..7b48d055 --- /dev/null +++ b/src/Spatial_searching/example/example_spatial_searching.cpp @@ -0,0 +1,54 @@ +#include <gudhi/Kd_tree_search.h> + +#include <CGAL/Epick_d.h> +#include <CGAL/Random.h> + +#include <vector> + +namespace gss = Gudhi::spatial_searching; + +int main (void) +{ + typedef CGAL::Epick_d<CGAL::Dimension_tag<4> > K; + typedef typename K::FT FT; + typedef typename K::Point_d Point; + typedef std::vector<Point> Points; + + typedef gss::Kd_tree_search<K, Points> Points_ds; + + CGAL::Random rd; + + Points points; + for (int i = 0; i < 500; ++i) + points.push_back(Point(rd.get_double(-1.,1), rd.get_double(-1.,1), rd.get_double(-1.,1), rd.get_double(-1.,1))); + + Points_ds points_ds(points); + + // 10-nearest neighbor query + std::cout << "10 nearest neighbors from points[20]:\n"; + auto kns_range = points_ds.query_k_nearest_neighbors(points[20], 10, true); + for (auto const& nghb : kns_range) + std::cout << nghb.first << " (sq. dist. = " << nghb.second << ")\n"; + + // Incremental nearest neighbor query + std::cout << "Incremental nearest neighbors:\n"; + auto ins_range = points_ds.query_incremental_nearest_neighbors(points[45]); + // Get all the neighbors that are closer than 0.5 + for (auto ins_iterator = ins_range.begin(); ins_iterator->second < 0.5*0.5 ; ++ins_iterator) + std::cout << ins_iterator->first << " (sq. dist. = " << ins_iterator->second << ")\n"; + + // 10-farthest neighbor query + std::cout << "10 farthest neighbors from points[20]:\n"; + auto kfs_range = points_ds.query_k_farthest_neighbors(points[20], 10, true); + for (auto const& nghb : kfs_range) + std::cout << nghb.first << " (sq. dist. = " << nghb.second << ")\n"; + + // Incremental farthest neighbor query + std::cout << "Incremental farthest neighbors:\n"; + auto ifs_range = points_ds.query_incremental_farthest_neighbors(points[45]); + // Get all the neighbors that are farthest than 2.3 + for (auto ifs_iterator = ifs_range.begin(); ifs_iterator->second > 2.3*2.3 ; ++ifs_iterator) + std::cout << ifs_iterator->first << " (sq. dist. = " << ifs_iterator->second << ")\n"; + + return 0; +} |