PostGIS  2.5.7dev-r@@SVN_REVISION@@

◆ cluster_intersecting()

int cluster_intersecting ( GEOSGeometry **  geoms,
uint32_t  num_geoms,
GEOSGeometry ***  clusterGeoms,
uint32_t num_clusters 

Takes an array of GEOSGeometry* and constructs an array of GEOSGeometry*, where each element in the constructed array is a GeometryCollection representing a set of interconnected geometries.

Caller is responsible for freeing the input array, but not for destroying the GEOSGeometry* items inside it.

Definition at line 247 of file lwgeom_geos_cluster.c.

248 {
249  int cluster_success;
250  UNIONFIND* uf = UF_create(num_geoms);
252  if (union_intersecting_pairs(geoms, num_geoms, uf) == LW_FAILURE)
253  {
254  UF_destroy(uf);
255  return LW_FAILURE;
256  }
258  cluster_success = combine_geometries(uf, (void**) geoms, num_geoms, (void***) clusterGeoms, num_clusters, 0);
259  UF_destroy(uf);
260  return cluster_success;
261 }
#define LW_FAILURE
Definition: liblwgeom.h:79
static int union_intersecting_pairs(GEOSGeometry **geoms, uint32_t num_geoms, UNIONFIND *uf)
static int combine_geometries(UNIONFIND *uf, void **geoms, uint32_t num_geoms, void ***clustersGeoms, uint32_t *num_clusters, char is_lwgeom)
Uses a UNIONFIND to identify the set with which each input geometry is associated,...
void UF_destroy(UNIONFIND *uf)
Definition: lwunionfind.c:53
UNIONFIND * UF_create(uint32_t N)
Definition: lwunionfind.c:34

References combine_geometries(), LW_FAILURE, UF_create(), UF_destroy(), and union_intersecting_pairs().

Referenced by clusterintersecting_garray(), and perform_cluster_intersecting_test().

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