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

Definition at line 2801 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(), LW_FALSE, lwerror(), lwgeom_geos_errmsg, lwgeom_geos_error(), lwnotice(), POSTGIS2GEOS(), result, and TRUE.

2802 {
2803  GSERIALIZED *geom1;
2804  GSERIALIZED *geom2;
2805  GEOSGeometry *g1, *g2;
2806  bool result;
2807  GBOX box1, box2;
2808 
2809  geom1 = (GSERIALIZED *)PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
2810  geom2 = (GSERIALIZED *)PG_DETOAST_DATUM(PG_GETARG_DATUM(1));
2811 
2812  errorIfGeometryCollection(geom1,geom2);
2814 
2815  /* A.Disjoint(Empty) == TRUE */
2816  if ( gserialized_is_empty(geom1) || gserialized_is_empty(geom2) )
2817  PG_RETURN_BOOL(true);
2818 
2819  /*
2820  * short-circuit 1: if geom2 bounding box does not overlap
2821  * geom1 bounding box we can prematurely return TRUE.
2822  * Do the test IFF BOUNDING BOX AVAILABLE.
2823  */
2824  if ( gserialized_get_gbox_p(geom1, &box1) &&
2825  gserialized_get_gbox_p(geom2, &box2) )
2826  {
2827  if ( gbox_overlaps_2d(&box1, &box2) == LW_FALSE )
2828  {
2829  PG_RETURN_BOOL(TRUE);
2830  }
2831  }
2832 
2833  initGEOS(lwnotice, lwgeom_geos_error);
2834 
2835  g1 = (GEOSGeometry *)POSTGIS2GEOS(geom1);
2836  if ( 0 == g1 ) /* exception thrown at construction */
2837  {
2838  lwerror("First argument geometry could not be converted to GEOS: %s", lwgeom_geos_errmsg);
2839  PG_RETURN_NULL();
2840  }
2841 
2842  g2 = (GEOSGeometry *)POSTGIS2GEOS(geom2);
2843  if ( 0 == g2 ) /* exception thrown at construction */
2844  {
2845  lwerror("Second argument geometry could not be converted to GEOS: %s", lwgeom_geos_errmsg);
2846  GEOSGeom_destroy(g1);
2847  PG_RETURN_NULL();
2848  }
2849 
2850  result = GEOSDisjoint(g1,g2);
2851 
2852  GEOSGeom_destroy(g1);
2853  GEOSGeom_destroy(g2);
2854 
2855  if (result == 2)
2856  {
2857  lwerror("GEOSDisjoint: %s", lwgeom_geos_errmsg);
2858  PG_RETURN_NULL(); /* never get here */
2859  }
2860 
2861  PG_FREE_IF_COPY(geom1, 0);
2862  PG_FREE_IF_COPY(geom2, 1);
2863 
2864  PG_RETURN_BOOL(result);
2865 }
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
GEOSGeometry * POSTGIS2GEOS(GSERIALIZED *pglwgeom)
#define TRUE
Definition: dbfopen.c:170
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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