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

Definition at line 1670 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, lwgeom_geos_error(), and POSTGIS2GEOS().

1671 {
1672  GSERIALIZED *geom1;
1673  GSERIALIZED *geom2;
1674  GEOSGeometry *g1, *g2;
1675  bool result;
1676  GBOX box1, box2;
1677 
1678  geom1 = PG_GETARG_GSERIALIZED_P(0);
1679  geom2 = PG_GETARG_GSERIALIZED_P(1);
1680 
1681  errorIfGeometryCollection(geom1,geom2);
1683 
1684  /* A.Overlaps(Empty) == FALSE */
1685  if ( gserialized_is_empty(geom1) || gserialized_is_empty(geom2) )
1686  PG_RETURN_BOOL(false);
1687 
1688  /*
1689  * short-circuit 1: if geom2 bounding box does not overlap
1690  * geom1 bounding box we can prematurely return FALSE.
1691  */
1692  if ( gserialized_get_gbox_p(geom1, &box1) &&
1693  gserialized_get_gbox_p(geom2, &box2) )
1694  {
1695  if ( ! gbox_overlaps_2d(&box1, &box2) )
1696  {
1697  PG_RETURN_BOOL(false);
1698  }
1699  }
1700 
1701  initGEOS(lwpgnotice, lwgeom_geos_error);
1702 
1703  g1 = (GEOSGeometry *)POSTGIS2GEOS(geom1);
1704  if (!g1)
1705  HANDLE_GEOS_ERROR("First argument geometry could not be converted to GEOS");
1706 
1707  g2 = (GEOSGeometry *)POSTGIS2GEOS(geom2);
1708 
1709  if (!g2)
1710  {
1711  GEOSGeom_destroy(g1);
1712  HANDLE_GEOS_ERROR("Second argument geometry could not be converted to GEOS");
1713  }
1714 
1715  result = GEOSOverlaps(g1,g2);
1716 
1717  GEOSGeom_destroy(g1);
1718  GEOSGeom_destroy(g2);
1719  if (result == 2) HANDLE_GEOS_ERROR("GEOSOverlaps");
1720 
1721  PG_FREE_IF_COPY(geom1, 0);
1722  PG_FREE_IF_COPY(geom2, 1);
1723 
1724  PG_RETURN_BOOL(result);
1725 }
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,...)
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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