PostGIS  2.5.0dev-r@@SVN_REVISION@@

◆ geos_intersects()

Datum geos_intersects ( PG_FUNCTION_ARGS  )

Definition at line 2311 of file postgis/lwgeom_geos.c.

References error_if_srid_mismatch(), errorIfGeometryCollection(), gbox_overlaps_2d(), PrepGeomCache::gcache, LWMPOINT::geoms, GetPrepGeomCache(), GetRtreeCache(), gserialized_get_gbox_p(), gserialized_get_srid(), gserialized_get_type(), gserialized_is_empty(), HANDLE_GEOS_ERROR, is_point(), is_poly(), LW_FALSE, LW_TRUE, lwgeom_as_lwmpoint(), lwgeom_as_lwpoint(), lwgeom_free(), lwgeom_from_gserialized(), lwgeom_geos_error(), lwmpoint_free(), MULTIPOINTTYPE, LWMPOINT::ngeoms, PG_FUNCTION_INFO_V1(), pip_short_circuit(), POINTTYPE, POSTGIS2GEOS(), PrepGeomCache::prepared_geom, and touches().

Referenced by crosses().

2312 {
2313  GSERIALIZED *geom1;
2314  GSERIALIZED *geom2;
2315  int result;
2316  GBOX box1, box2;
2317  PrepGeomCache *prep_cache;
2318 
2319  geom1 = PG_GETARG_GSERIALIZED_P(0);
2320  geom2 = PG_GETARG_GSERIALIZED_P(1);
2321 
2322  errorIfGeometryCollection(geom1,geom2);
2324 
2325  /* A.Intersects(Empty) == FALSE */
2326  if ( gserialized_is_empty(geom1) || gserialized_is_empty(geom2) )
2327  PG_RETURN_BOOL(false);
2328 
2329  /*
2330  * short-circuit 1: if geom2 bounding box does not overlap
2331  * geom1 bounding box we can prematurely return FALSE.
2332  */
2333  if ( gserialized_get_gbox_p(geom1, &box1) &&
2334  gserialized_get_gbox_p(geom2, &box2) )
2335  {
2336  if ( gbox_overlaps_2d(&box1, &box2) == LW_FALSE )
2337  {
2338  PG_RETURN_BOOL(false);
2339  }
2340  }
2341 
2342  /*
2343  * short-circuit 2: if the geoms are a point and a polygon,
2344  * call the point_outside_polygon function.
2345  */
2346  if ((is_point(geom1) && is_poly(geom2)) || (is_poly(geom1) && is_point(geom2)))
2347  {
2348  GSERIALIZED* gpoly = is_poly(geom1) ? geom1 : geom2;
2349  GSERIALIZED* gpoint = is_point(geom1) ? geom1 : geom2;
2350  RTREE_POLY_CACHE* cache = GetRtreeCache(fcinfo, gpoly);
2351  int retval;
2352 
2353  POSTGIS_DEBUG(3, "Point in Polygon test requested...short-circuiting.");
2354  if (gserialized_get_type(gpoint) == POINTTYPE)
2355  {
2356  LWGEOM* point = lwgeom_from_gserialized(gpoint);
2357  int pip_result = pip_short_circuit(cache, lwgeom_as_lwpoint(point), gpoly);
2358  lwgeom_free(point);
2359 
2360  retval = (pip_result != -1); /* not outside */
2361  }
2362  else if (gserialized_get_type(gpoint) == MULTIPOINTTYPE)
2363  {
2365  uint32_t i;
2366 
2367  retval = LW_FALSE;
2368  for (i = 0; i < mpoint->ngeoms; i++)
2369  {
2370  int pip_result = pip_short_circuit(cache, mpoint->geoms[i], gpoly);
2371  if (pip_result != -1) /* not outside */
2372  {
2373  retval = LW_TRUE;
2374  break;
2375  }
2376  }
2377 
2378  lwmpoint_free(mpoint);
2379  }
2380  else
2381  {
2382  /* Never get here */
2383  elog(ERROR,"Type isn't point or multipoint!");
2384  PG_RETURN_NULL();
2385  }
2386 
2387  PG_FREE_IF_COPY(geom1, 0);
2388  PG_FREE_IF_COPY(geom2, 1);
2389  PG_RETURN_BOOL(retval);
2390  }
2391 
2392  initGEOS(lwpgnotice, lwgeom_geos_error);
2393  prep_cache = GetPrepGeomCache( fcinfo, geom1, geom2 );
2394 
2395  if ( prep_cache && prep_cache->prepared_geom )
2396  {
2397  if ( prep_cache->gcache.argnum == 1 )
2398  {
2399  GEOSGeometry *g = POSTGIS2GEOS(geom2);
2400  if (!g)
2401  HANDLE_GEOS_ERROR("Geometry could not be converted to GEOS");
2402  result = GEOSPreparedIntersects( prep_cache->prepared_geom, g);
2403  GEOSGeom_destroy(g);
2404  }
2405  else
2406  {
2407  GEOSGeometry *g = POSTGIS2GEOS(geom1);
2408  if (!g)
2409  HANDLE_GEOS_ERROR("Geometry could not be converted to GEOS");
2410  result = GEOSPreparedIntersects( prep_cache->prepared_geom, g);
2411  GEOSGeom_destroy(g);
2412  }
2413  }
2414  else
2415  {
2416  GEOSGeometry *g1;
2417  GEOSGeometry *g2;
2418  g1 = POSTGIS2GEOS(geom1);
2419  if (!g1)
2421  "First argument geometry could not be converted to "
2422  "GEOS");
2423  g2 = POSTGIS2GEOS(geom2);
2424  if (!g2)
2425  {
2426  GEOSGeom_destroy(g1);
2428  "Second argument geometry could not be converted "
2429  "to GEOS");
2430  }
2431  result = GEOSIntersects( g1, g2);
2432  GEOSGeom_destroy(g1);
2433  GEOSGeom_destroy(g2);
2434  }
2435 
2436  if (result == 2) HANDLE_GEOS_ERROR("GEOSIntersects");
2437 
2438  PG_FREE_IF_COPY(geom1, 0);
2439  PG_FREE_IF_COPY(geom2, 1);
2440 
2441  PG_RETURN_BOOL(result);
2442 }
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:639
uint32_t gserialized_get_type(const GSERIALIZED *s)
Extract the geometry type from the serialized form (it hides in the anonymous data area...
Definition: g_serialized.c:86
uint32_t ngeoms
Definition: liblwgeom.h:470
const GEOSPreparedGeometry * prepared_geom
static char is_poly(const GSERIALIZED *g)
LWGEOM * lwgeom_from_gserialized(const GSERIALIZED *g)
Allocate a new LWGEOM from a GSERIALIZED.
void lwgeom_free(LWGEOM *geom)
Definition: lwgeom.c:1144
#define MULTIPOINTTYPE
Definition: liblwgeom.h:87
The tree structure used for fast P-i-P tests by point_in_multipolygon_rtree()
Definition: lwgeom_rtree.h:58
void error_if_srid_mismatch(int srid1, int srid2)
Definition: lwutil.c:338
LWPOINT * lwgeom_as_lwpoint(const LWGEOM *lwgeom)
Definition: lwgeom.c:161
static char is_point(const GSERIALIZED *g)
int gserialized_is_empty(const GSERIALIZED *g)
Check if a GSERIALIZED is empty without deserializing first.
Definition: g_serialized.c:178
unsigned int uint32_t
Definition: uthash.h:78
void lwmpoint_free(LWMPOINT *mpt)
Definition: lwmpoint.c:72
void lwgeom_geos_error(const char *fmt,...)
#define LW_FALSE
Definition: liblwgeom.h:76
#define LW_TRUE
Return types for functions with status returns.
Definition: liblwgeom.h:75
LWPOINT ** geoms
Definition: liblwgeom.h:472
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
GEOSGeometry * POSTGIS2GEOS(GSERIALIZED *pglwgeom)
#define POINTTYPE
LWTYPE numbers, used internally by PostGIS.
Definition: liblwgeom.h:84
LWMPOINT * lwgeom_as_lwmpoint(const LWGEOM *lwgeom)
Definition: lwgeom.c:233
PrepGeomCache * GetPrepGeomCache(FunctionCallInfoData *fcinfo, GSERIALIZED *g1, GSERIALIZED *g2)
Given a couple potential geometries and a function call context, return a prepared structure for one ...
#define HANDLE_GEOS_ERROR(label)
RTREE_POLY_CACHE * GetRtreeCache(FunctionCallInfoData *fcinfo, GSERIALIZED *g1)
Checks for a cache hit against the provided geometry and returns a pre-built index structure (RTREE_P...
Definition: lwgeom_rtree.c:432
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:99
static int pip_short_circuit(RTREE_POLY_CACHE *poly_cache, LWPOINT *point, GSERIALIZED *gpoly)
void errorIfGeometryCollection(GSERIALIZED *g1, GSERIALIZED *g2)
Throws an ereport ERROR if either geometry is a COLLECTIONTYPE.
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