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

Definition at line 2733 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.

2734 {
2735  GSERIALIZED *geom1;
2736  GSERIALIZED *geom2;
2737  GEOSGeometry *g1, *g2;
2738  bool result;
2739  GBOX box1, box2;
2740 
2741  geom1 = (GSERIALIZED *)PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
2742  geom2 = (GSERIALIZED *)PG_DETOAST_DATUM(PG_GETARG_DATUM(1));
2743 
2744  errorIfGeometryCollection(geom1,geom2);
2746 
2747  /* A.Touches(Empty) == FALSE */
2748  if ( gserialized_is_empty(geom1) || gserialized_is_empty(geom2) )
2749  PG_RETURN_BOOL(false);
2750 
2751  /*
2752  * short-circuit 1: if geom2 bounding box does not overlap
2753  * geom1 bounding box we can prematurely return FALSE.
2754  * Do the test IFF BOUNDING BOX AVAILABLE.
2755  */
2756  if ( gserialized_get_gbox_p(geom1, &box1) &&
2757  gserialized_get_gbox_p(geom2, &box2) )
2758  {
2759  if ( gbox_overlaps_2d(&box1, &box2) == LW_FALSE )
2760  {
2761  PG_RETURN_BOOL(FALSE);
2762  }
2763  }
2764 
2765  initGEOS(lwnotice, lwgeom_geos_error);
2766 
2767  g1 = (GEOSGeometry *)POSTGIS2GEOS(geom1 );
2768  if ( 0 == g1 ) /* exception thrown at construction */
2769  {
2770  lwerror("First argument geometry could not be converted to GEOS: %s", lwgeom_geos_errmsg);
2771  PG_RETURN_NULL();
2772  }
2773 
2774  g2 = (GEOSGeometry *)POSTGIS2GEOS(geom2 );
2775  if ( 0 == g2 ) /* exception thrown at construction */
2776  {
2777  lwerror("Second argument geometry could not be converted to GEOS: %s", lwgeom_geos_errmsg);
2778  GEOSGeom_destroy(g1);
2779  PG_RETURN_NULL();
2780  }
2781 
2782  result = GEOSTouches(g1,g2);
2783 
2784  GEOSGeom_destroy(g1);
2785  GEOSGeom_destroy(g2);
2786 
2787  if (result == 2)
2788  {
2789  lwerror("GEOSTouches: %s", lwgeom_geos_errmsg);
2790  PG_RETURN_NULL(); /* never get here */
2791  }
2792 
2793  PG_FREE_IF_COPY(geom1, 0);
2794  PG_FREE_IF_COPY(geom2, 1);
2795 
2796  PG_RETURN_BOOL(result);
2797 }
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.

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