PostGIS  2.3.7dev-r@@SVN_REVISION@@
Datum disjoint ( PG_FUNCTION_ARGS  )

Definition at line 2504 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(), POSTGIS2GEOS(), and TRUE.

2505 {
2506  GSERIALIZED *geom1;
2507  GSERIALIZED *geom2;
2508  GEOSGeometry *g1, *g2;
2509  bool result;
2510  GBOX box1, box2;
2511 
2512  geom1 = PG_GETARG_GSERIALIZED_P(0);
2513  geom2 = PG_GETARG_GSERIALIZED_P(1);
2514 
2515  errorIfGeometryCollection(geom1,geom2);
2517 
2518  /* A.Disjoint(Empty) == TRUE */
2519  if ( gserialized_is_empty(geom1) || gserialized_is_empty(geom2) )
2520  PG_RETURN_BOOL(true);
2521 
2522  /*
2523  * short-circuit 1: if geom2 bounding box does not overlap
2524  * geom1 bounding box we can prematurely return TRUE.
2525  */
2526  if ( gserialized_get_gbox_p(geom1, &box1) &&
2527  gserialized_get_gbox_p(geom2, &box2) )
2528  {
2529  if ( gbox_overlaps_2d(&box1, &box2) == LW_FALSE )
2530  {
2531  PG_RETURN_BOOL(TRUE);
2532  }
2533  }
2534 
2535  initGEOS(lwpgnotice, lwgeom_geos_error);
2536 
2537  g1 = (GEOSGeometry *)POSTGIS2GEOS(geom1);
2538  if ( 0 == g1 ) /* exception thrown at construction */
2539  {
2540  HANDLE_GEOS_ERROR("First argument geometry could not be converted to GEOS");
2541  PG_RETURN_NULL();
2542  }
2543 
2544  g2 = (GEOSGeometry *)POSTGIS2GEOS(geom2);
2545  if ( 0 == g2 ) /* exception thrown at construction */
2546  {
2547  HANDLE_GEOS_ERROR("Second argument geometry could not be converted to GEOS");
2548  GEOSGeom_destroy(g1);
2549  PG_RETURN_NULL();
2550  }
2551 
2552  result = GEOSDisjoint(g1,g2);
2553 
2554  GEOSGeom_destroy(g1);
2555  GEOSGeom_destroy(g2);
2556 
2557  if (result == 2)
2558  {
2559  HANDLE_GEOS_ERROR("GEOSDisjoint");
2560  PG_RETURN_NULL(); /* never get here */
2561  }
2562 
2563  PG_FREE_IF_COPY(geom1, 0);
2564  PG_FREE_IF_COPY(geom2, 1);
2565 
2566  PG_RETURN_BOOL(result);
2567 }
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,...)
#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:335
GEOSGeometry * POSTGIS2GEOS(GSERIALIZED *pglwgeom)
#define HANDLE_GEOS_ERROR(label)
#define TRUE
Definition: dbfopen.c:169
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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