PostGIS  2.1.10dev-r@@SVN_REVISION@@
Datum crosses ( PG_FUNCTION_ARGS  )

Definition at line 2503 of file postgis/lwgeom_geos.c.

References error_if_srid_mismatch(), errorIfGeometryCollection(), FALSE, gbox_overlaps_2d(), gserialized_get_gbox_p(), gserialized_get_srid(), gserialized_is_empty(), LW_FALSE, lwerror(), lwgeom_geos_errmsg, lwgeom_geos_error(), lwnotice(), POSTGIS2GEOS(), and result.

2504 {
2505  GSERIALIZED *geom1;
2506  GSERIALIZED *geom2;
2507  GEOSGeometry *g1, *g2;
2508  int result;
2509  GBOX box1, box2;
2510 
2511  geom1 = (GSERIALIZED *)PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
2512  geom2 = (GSERIALIZED *)PG_DETOAST_DATUM(PG_GETARG_DATUM(1));
2513 
2514  errorIfGeometryCollection(geom1,geom2);
2516 
2517  /* A.Crosses(Empty) == FALSE */
2518  if ( gserialized_is_empty(geom1) || gserialized_is_empty(geom2) )
2519  PG_RETURN_BOOL(false);
2520 
2521  /*
2522  * short-circuit 1: if geom2 bounding box does not overlap
2523  * geom1 bounding box we can prematurely return FALSE.
2524  * Do the test IFF BOUNDING BOX AVAILABLE.
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(FALSE);
2532  }
2533  }
2534 
2535  initGEOS(lwnotice, lwgeom_geos_error);
2536 
2537  g1 = (GEOSGeometry *)POSTGIS2GEOS(geom1);
2538  if ( 0 == g1 ) /* exception thrown at construction */
2539  {
2540  lwerror("First argument geometry could not be converted to GEOS: %s", lwgeom_geos_errmsg);
2541  PG_RETURN_NULL();
2542  }
2543 
2544  g2 = (GEOSGeometry *)POSTGIS2GEOS(geom2);
2545  if ( 0 == g2 ) /* exception thrown at construction */
2546  {
2547  lwerror("Second argument geometry could not be converted to GEOS: %s", lwgeom_geos_errmsg);
2548  GEOSGeom_destroy(g1);
2549  PG_RETURN_NULL();
2550  }
2551 
2552  result = GEOSCrosses(g1,g2);
2553 
2554  GEOSGeom_destroy(g1);
2555  GEOSGeom_destroy(g2);
2556 
2557  if (result == 2)
2558  {
2559  lwerror("GEOSCrosses: %s", lwgeom_geos_errmsg);
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:373
void error_if_srid_mismatch(int srid1, int srid2)
Definition: lwutil.c:317
char lwgeom_geos_errmsg[LWGEOM_GEOS_ERRMSG_MAXSIZE]
char ** result
Definition: liblwgeom.h:218
int gserialized_is_empty(const GSERIALIZED *g)
Check if a GSERIALIZED is empty without deserializing first.
Definition: g_serialized.c:140
void lwerror(const char *fmt,...)
Write a notice out to the error handler.
Definition: lwutil.c:67
void lwnotice(const char *fmt,...)
Write a notice out to the notice handler.
Definition: lwutil.c:54
void lwgeom_geos_error(const char *fmt,...)
#define LW_FALSE
Definition: liblwgeom.h:52
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:281
#define FALSE
Definition: dbfopen.c:169
GEOSGeometry * POSTGIS2GEOS(GSERIALIZED *pglwgeom)
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:70
void errorIfGeometryCollection(GSERIALIZED *g1, GSERIALIZED *g2)
Throws an ereport ERROR if either geometry is a COLLECTIONTYPE.

Here is the call graph for this function: