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//
// Test Suite for C-API GEOSCluster*
#include <tut/tut.hpp>
// geos
#include <geos_c.h>
#include "capi_test_utils.h"
namespace tut {
//
// Test Group
//
// Common data used in test cases.
struct test_capicluster_data : public capitest::utility {
static GEOSGeometry* construct_clusters(const GEOSGeometry* input,
const GEOSClusterInfo* clusters)
{
auto ngeoms = static_cast<std::size_t>(GEOSGetNumGeometries(input));
auto numClusters = GEOSClusterInfo_getNumClusters(clusters);
std::vector<GEOSGeometry*> cluster_components(ngeoms);
std::vector<GEOSGeometry*> cluster_geoms(numClusters);
for (std::size_t cluster_id = 0; cluster_id < numClusters; cluster_id++) {
auto sz = GEOSClusterInfo_getClusterSize(clusters, cluster_id);
const std::size_t* indices = GEOSClusterInfo_getInputsForClusterN(clusters, cluster_id);
for (std::size_t i = 0; i < sz; i++) {
cluster_components[i] = GEOSGeom_clone(GEOSGetGeometryN(input, static_cast<int>(indices[i])));
}
cluster_geoms[cluster_id] = GEOSGeom_createCollection(GEOS_GEOMETRYCOLLECTION,
cluster_components.data(),
static_cast<unsigned>(sz));
}
// combine the clusters into a single nested GeometryCollection
return GEOSGeom_createCollection(GEOS_GEOMETRYCOLLECTION,
cluster_geoms.data(),
static_cast<unsigned>(cluster_geoms.size()));
}
};
typedef test_group<test_capicluster_data> group;
typedef group::object object;
group test_capicluster_group("capi::GEOSCluster");
//
// Test Cases
//
template<>
template<> void object::test<1>
()
{
input_ = fromWKT(
"GEOMETRYCOLLECTION ("
"POINT (0 1),"
"LINESTRING (0 0, 0 0.1),"
"LINESTRING (0 0, 1.0 1.0),"
"POINT (0.9 1.0),"
"POINT (0 7))");
{
GEOSClusterInfo* clusters = GEOSClusterEnvelopeIntersects(input_);
ensure_equals("two clusters by envelope intersection", GEOSClusterInfo_getNumClusters(clusters), 2u);
GEOSGeometry* geom_result = construct_clusters(input_, clusters);
GEOSGeometry* geom_expected = fromWKT("GEOMETRYCOLLECTION ("
" GEOMETRYCOLLECTION ("
" POINT (0 1),"
" LINESTRING (0 0, 0 0.1),"
" LINESTRING (0 0, 1.0 1.0),"
" POINT (0.9 1.0)),"
" GEOMETRYCOLLECTION ("
" POINT (0 7)))");
ensure_geometry_equals_identical(geom_expected, geom_result);
GEOSGeom_destroy(geom_result);
GEOSGeom_destroy(geom_expected);
GEOSClusterInfo_destroy(clusters);
}
{
GEOSClusterInfo* clusters = GEOSClusterEnvelopeDistance(input_, 6);
ensure_equals("one cluster by envelope distance", GEOSClusterInfo_getNumClusters(clusters), 1u);
GEOSClusterInfo_destroy(clusters);
}
{
GEOSClusterInfo* clusters = GEOSClusterGeometryIntersects(input_);
ensure_equals("four clusters by geometry intersection", GEOSClusterInfo_getNumClusters(clusters), 4u);
GEOSClusterInfo_destroy(clusters);
}
{
GEOSClusterInfo* clusters = GEOSClusterGeometryDistance(input_, 0.2);
ensure_equals("three clusters by distance", GEOSClusterInfo_getNumClusters(clusters), 3u);
GEOSClusterInfo_destroy(clusters);
}
}
template<>
template<>
void object::test<2>()
{
input_ = fromWKT(
"GEOMETRYCOLLECTION ("
"POINT (0 0),"
"POINT (-1 0),"
"POINT (-1 -0.1),"
"POINT (-1 0.1),"
"POINT (1 0),"
"POINT (2 0),"
"POINT (3 0),"
"POINT ( 3 -0.1),"
"POINT ( 3 0.1)"
")");
{
GEOSClusterInfo* clusters = GEOSClusterDBSCAN(input_, 1.01, 5);
ensure_equals("two clusters with minPoints = 5", GEOSClusterInfo_getNumClusters(clusters), 2u);
GEOSClusterInfo_destroy(clusters);
}
{
GEOSClusterInfo* clusters = GEOSClusterDBSCAN(input_, 1.01, 2);
ensure_equals("one cluster with minPoints = 2", GEOSClusterInfo_getNumClusters(clusters), 1u);
GEOSClusterInfo_destroy(clusters);
}
{
GEOSClusterInfo* clusters = GEOSClusterDBSCAN(input_, 1.01, 20);
ensure_equals("no clusters with minPoints = 20", GEOSClusterInfo_getNumClusters(clusters), 0u);
auto* cluster_ids = GEOSClusterInfo_getClustersForInputs(clusters);
for (int i = 0; i < GEOSGetNumGeometries(input_); i++) {
ensure_equals(cluster_ids[i], GEOS_CLUSTER_NONE);
}
GEOSClusterInfo_destroy(clusters);
GEOSFree(cluster_ids);
}
}
} // namespace tut
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