PostGIS  2.3.8dev-r@@SVN_REVISION@@

◆ overlaps()

Datum overlaps ( PG_FUNCTION_ARGS  )

Definition at line 1652 of file postgis/lwgeom_geos.c.

References contains(), error_if_srid_mismatch(), errorIfGeometryCollection(), FALSE, gbox_overlaps_2d(), gserialized_get_gbox_p(), gserialized_get_srid(), gserialized_is_empty(), HANDLE_GEOS_ERROR, lwgeom_geos_error(), PG_FUNCTION_INFO_V1(), and POSTGIS2GEOS().

Referenced by isvaliddetail().

1653 {
1654  GSERIALIZED *geom1;
1655  GSERIALIZED *geom2;
1656  GEOSGeometry *g1, *g2;
1657  bool result;
1658  GBOX box1, box2;
1659 
1660  geom1 = PG_GETARG_GSERIALIZED_P(0);
1661  geom2 = PG_GETARG_GSERIALIZED_P(1);
1662 
1663  errorIfGeometryCollection(geom1,geom2);
1665 
1666  /* A.Overlaps(Empty) == FALSE */
1667  if ( gserialized_is_empty(geom1) || gserialized_is_empty(geom2) )
1668  PG_RETURN_BOOL(false);
1669 
1670  /*
1671  * short-circuit 1: if geom2 bounding box does not overlap
1672  * geom1 bounding box we can prematurely return FALSE.
1673  */
1674  if ( gserialized_get_gbox_p(geom1, &box1) &&
1675  gserialized_get_gbox_p(geom2, &box2) )
1676  {
1677  if ( ! gbox_overlaps_2d(&box1, &box2) )
1678  {
1679  PG_RETURN_BOOL(FALSE);
1680  }
1681  }
1682 
1683  initGEOS(lwpgnotice, lwgeom_geos_error);
1684 
1685  g1 = (GEOSGeometry *)POSTGIS2GEOS(geom1);
1686  if ( 0 == g1 ) /* exception thrown at construction */
1687  {
1688  HANDLE_GEOS_ERROR("First argument geometry could not be converted to GEOS");
1689  PG_RETURN_NULL();
1690  }
1691 
1692  g2 = (GEOSGeometry *)POSTGIS2GEOS(geom2);
1693 
1694  if ( 0 == g2 ) /* exception thrown at construction */
1695  {
1696  GEOSGeom_destroy(g1);
1697  HANDLE_GEOS_ERROR("Second argument geometry could not be converted to GEOS");
1698  PG_RETURN_NULL();
1699  }
1700 
1701  result = GEOSOverlaps(g1,g2);
1702 
1703  GEOSGeom_destroy(g1);
1704  GEOSGeom_destroy(g2);
1705  if (result == 2)
1706  {
1707  HANDLE_GEOS_ERROR("GEOSOverlaps");
1708  PG_RETURN_NULL(); /* never get here */
1709  }
1710 
1711  PG_FREE_IF_COPY(geom1, 0);
1712  PG_FREE_IF_COPY(geom2, 1);
1713 
1714  PG_RETURN_BOOL(result);
1715 }
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:398
void error_if_srid_mismatch(int srid1, int srid2)
Definition: lwutil.c:369
int gserialized_is_empty(const GSERIALIZED *g)
Check if a GSERIALIZED is empty without deserializing first.
Definition: g_serialized.c:153
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:335
#define FALSE
Definition: dbfopen.c:168
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:83
void errorIfGeometryCollection(GSERIALIZED *g1, GSERIALIZED *g2)
Throws an ereport ERROR if either geometry is a COLLECTIONTYPE.
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