PostGIS  2.5.0dev-r@@SVN_REVISION@@
Datum touches ( PG_FUNCTION_ARGS  )

Definition at line 2405 of file postgis/lwgeom_geos.c.

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().

2406 {
2407  GSERIALIZED *geom1;
2408  GSERIALIZED *geom2;
2409  GEOSGeometry *g1, *g2;
2410  bool result;
2411  GBOX box1, box2;
2412 
2413  geom1 = PG_GETARG_GSERIALIZED_P(0);
2414  geom2 = PG_GETARG_GSERIALIZED_P(1);
2415 
2416  errorIfGeometryCollection(geom1,geom2);
2418 
2419  /* A.Touches(Empty) == FALSE */
2420  if ( gserialized_is_empty(geom1) || gserialized_is_empty(geom2) )
2421  PG_RETURN_BOOL(false);
2422 
2423  /*
2424  * short-circuit 1: if geom2 bounding box does not overlap
2425  * geom1 bounding box we can prematurely return FALSE.
2426  */
2427  if ( gserialized_get_gbox_p(geom1, &box1) &&
2428  gserialized_get_gbox_p(geom2, &box2) )
2429  {
2430  if ( gbox_overlaps_2d(&box1, &box2) == LW_FALSE )
2431  {
2432  PG_RETURN_BOOL(false);
2433  }
2434  }
2435 
2436  initGEOS(lwpgnotice, lwgeom_geos_error);
2437 
2438  g1 = (GEOSGeometry *)POSTGIS2GEOS(geom1 );
2439  if (!g1)
2440  HANDLE_GEOS_ERROR("First argument geometry could not be converted to GEOS");
2441 
2442  g2 = (GEOSGeometry *)POSTGIS2GEOS(geom2 );
2443  if (!g2)
2444  {
2445  GEOSGeom_destroy(g1);
2447  "Second argument geometry could not be converted to GEOS");
2448  }
2449 
2450  result = GEOSTouches(g1,g2);
2451 
2452  GEOSGeom_destroy(g1);
2453  GEOSGeom_destroy(g2);
2454 
2455  if (result == 2) HANDLE_GEOS_ERROR("GEOSTouches");
2456 
2457  PG_FREE_IF_COPY(geom1, 0);
2458  PG_FREE_IF_COPY(geom2, 1);
2459 
2460  PG_RETURN_BOOL(result);
2461 }
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
void error_if_srid_mismatch(int srid1, int srid2)
Definition: lwutil.c:338
int gserialized_is_empty(const GSERIALIZED *g)
Check if a GSERIALIZED is empty without deserializing first.
Definition: g_serialized.c:178
void lwgeom_geos_error(const char *fmt,...)
#define LW_FALSE
Definition: liblwgeom.h:76
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 HANDLE_GEOS_ERROR(label)
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
void errorIfGeometryCollection(GSERIALIZED *g1, GSERIALIZED *g2)
Throws an ereport ERROR if either geometry is a COLLECTIONTYPE.

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