PostGIS  2.5.0beta2dev-r@@SVN_REVISION@@

◆ overlaps()

Datum overlaps ( PG_FUNCTION_ARGS  )

Definition at line 1567 of file postgis/lwgeom_geos.c.

References contains(), error_if_srid_mismatch(), errorIfGeometryCollection(), 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().

1568 {
1569  GSERIALIZED *geom1;
1570  GSERIALIZED *geom2;
1571  GEOSGeometry *g1, *g2;
1572  char result;
1573  GBOX box1, box2;
1574 
1575  geom1 = PG_GETARG_GSERIALIZED_P(0);
1576  geom2 = PG_GETARG_GSERIALIZED_P(1);
1577 
1578  errorIfGeometryCollection(geom1,geom2);
1580 
1581  /* A.Overlaps(Empty) == FALSE */
1582  if ( gserialized_is_empty(geom1) || gserialized_is_empty(geom2) )
1583  PG_RETURN_BOOL(false);
1584 
1585  /*
1586  * short-circuit 1: if geom2 bounding box does not overlap
1587  * geom1 bounding box we can return FALSE.
1588  */
1589  if ( gserialized_get_gbox_p(geom1, &box1) &&
1590  gserialized_get_gbox_p(geom2, &box2) )
1591  {
1592  if ( ! gbox_overlaps_2d(&box1, &box2) )
1593  {
1594  PG_RETURN_BOOL(false);
1595  }
1596  }
1597 
1598  initGEOS(lwpgnotice, lwgeom_geos_error);
1599 
1600  g1 = POSTGIS2GEOS(geom1);
1601  if (!g1)
1602  HANDLE_GEOS_ERROR("First argument geometry could not be converted to GEOS");
1603 
1604  g2 = POSTGIS2GEOS(geom2);
1605 
1606  if (!g2)
1607  {
1608  GEOSGeom_destroy(g1);
1609  HANDLE_GEOS_ERROR("Second argument geometry could not be converted to GEOS");
1610  }
1611 
1612  result = GEOSOverlaps(g1,g2);
1613 
1614  GEOSGeom_destroy(g1);
1615  GEOSGeom_destroy(g2);
1616  if (result == 2) HANDLE_GEOS_ERROR("GEOSOverlaps");
1617 
1618  PG_FREE_IF_COPY(geom1, 0);
1619  PG_FREE_IF_COPY(geom2, 1);
1620 
1621  PG_RETURN_BOOL(result);
1622 }
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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