PostGIS  2.5.7dev-r@@SVN_REVISION@@

◆ disjoint()

Datum disjoint ( PG_FUNCTION_ARGS  )

Definition at line 2326 of file postgis/lwgeom_geos.c.

2327 {
2328  GSERIALIZED *geom1;
2329  GSERIALIZED *geom2;
2330  GEOSGeometry *g1, *g2;
2331  char result;
2332  GBOX box1, box2;
2333 
2334  geom1 = PG_GETARG_GSERIALIZED_P(0);
2335  geom2 = PG_GETARG_GSERIALIZED_P(1);
2336 
2337  errorIfGeometryCollection(geom1,geom2);
2339 
2340  /* A.Disjoint(Empty) == TRUE */
2341  if ( gserialized_is_empty(geom1) || gserialized_is_empty(geom2) )
2342  PG_RETURN_BOOL(true);
2343 
2344  /*
2345  * short-circuit 1: if geom2 bounding box does not overlap
2346  * geom1 bounding box we can return TRUE.
2347  */
2348  if ( gserialized_get_gbox_p(geom1, &box1) &&
2349  gserialized_get_gbox_p(geom2, &box2) )
2350  {
2351  if ( gbox_overlaps_2d(&box1, &box2) == LW_FALSE )
2352  {
2353  PG_RETURN_BOOL(true);
2354  }
2355  }
2356 
2357  initGEOS(lwpgnotice, lwgeom_geos_error);
2358 
2359  g1 = POSTGIS2GEOS(geom1);
2360  if (!g1)
2361  HANDLE_GEOS_ERROR("First argument geometry could not be converted to GEOS");
2362 
2363  g2 = POSTGIS2GEOS(geom2);
2364  if (!g2)
2365  {
2366  GEOSGeom_destroy(g1);
2367  HANDLE_GEOS_ERROR("Second argument geometry could not be converted to GEOS");
2368  }
2369 
2370  result = GEOSDisjoint(g1,g2);
2371 
2372  GEOSGeom_destroy(g1);
2373  GEOSGeom_destroy(g2);
2374 
2375  if (result == 2) HANDLE_GEOS_ERROR("GEOSDisjoint");
2376 
2377  PG_FREE_IF_COPY(geom1, 0);
2378  PG_FREE_IF_COPY(geom2, 1);
2379 
2380  PG_RETURN_BOOL(result);
2381 }
int gbox_overlaps_2d(const GBOX *g1, const GBOX *g2)
Return LW_TRUE if the GBOX overlaps on the 2d plane, LW_FALSE otherwise.
Definition: g_box.c:330
int32_t gserialized_get_srid(const GSERIALIZED *s)
Extract the SRID from the serialized form (it is packed into three bytes so this is a handy function)...
Definition: g_serialized.c:100
int gserialized_is_empty(const GSERIALIZED *g)
Check if a GSERIALIZED is empty without deserializing first.
Definition: g_serialized.c:179
int gserialized_get_gbox_p(const GSERIALIZED *g, GBOX *box)
Read the bounding box off a serialization and calculate one if it is not already there.
Definition: g_serialized.c:640
void lwgeom_geos_error(const char *fmt,...)
#define LW_FALSE
Definition: liblwgeom.h:77
void error_if_srid_mismatch(int srid1, int srid2)
Definition: lwutil.c:338
#define HANDLE_GEOS_ERROR(label)
void errorIfGeometryCollection(GSERIALIZED *g1, GSERIALIZED *g2)
Throws an ereport ERROR if either geometry is a COLLECTIONTYPE.
GEOSGeometry * POSTGIS2GEOS(GSERIALIZED *pglwgeom)

References error_if_srid_mismatch(), errorIfGeometryCollection(), gbox_overlaps_2d(), gserialized_get_gbox_p(), gserialized_get_srid(), gserialized_is_empty(), HANDLE_GEOS_ERROR, LW_FALSE, lwgeom_geos_error(), and POSTGIS2GEOS().

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