PostGIS  2.2.8dev-r@@SVN_REVISION@@

◆ disjoint()

Datum disjoint ( PG_FUNCTION_ARGS  )

Definition at line 2799 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(), PG_FUNCTION_INFO_V1(), POSTGIS2GEOS(), relate_pattern(), and TRUE.

Referenced by touches().

2800 {
2801  GSERIALIZED *geom1;
2802  GSERIALIZED *geom2;
2803  GEOSGeometry *g1, *g2;
2804  bool result;
2805  GBOX box1, box2;
2806 
2807  geom1 = PG_GETARG_GSERIALIZED_P(0);
2808  geom2 = PG_GETARG_GSERIALIZED_P(1);
2809 
2810  errorIfGeometryCollection(geom1,geom2);
2812 
2813  /* A.Disjoint(Empty) == TRUE */
2814  if ( gserialized_is_empty(geom1) || gserialized_is_empty(geom2) )
2815  PG_RETURN_BOOL(true);
2816 
2817  /*
2818  * short-circuit 1: if geom2 bounding box does not overlap
2819  * geom1 bounding box we can prematurely return TRUE.
2820  * Do the test IFF BOUNDING BOX AVAILABLE.
2821  */
2822  if ( gserialized_get_gbox_p(geom1, &box1) &&
2823  gserialized_get_gbox_p(geom2, &box2) )
2824  {
2825  if ( gbox_overlaps_2d(&box1, &box2) == LW_FALSE )
2826  {
2827  PG_RETURN_BOOL(TRUE);
2828  }
2829  }
2830 
2831  initGEOS(lwpgnotice, lwgeom_geos_error);
2832 
2833  g1 = (GEOSGeometry *)POSTGIS2GEOS(geom1);
2834  if ( 0 == g1 ) /* exception thrown at construction */
2835  {
2836  HANDLE_GEOS_ERROR("First argument geometry could not be converted to GEOS");
2837  PG_RETURN_NULL();
2838  }
2839 
2840  g2 = (GEOSGeometry *)POSTGIS2GEOS(geom2);
2841  if ( 0 == g2 ) /* exception thrown at construction */
2842  {
2843  HANDLE_GEOS_ERROR("Second argument geometry could not be converted to GEOS");
2844  GEOSGeom_destroy(g1);
2845  PG_RETURN_NULL();
2846  }
2847 
2848  result = GEOSDisjoint(g1,g2);
2849 
2850  GEOSGeom_destroy(g1);
2851  GEOSGeom_destroy(g2);
2852 
2853  if (result == 2)
2854  {
2855  HANDLE_GEOS_ERROR("GEOSDisjoint");
2856  PG_RETURN_NULL(); /* never get here */
2857  }
2858 
2859  PG_FREE_IF_COPY(geom1, 0);
2860  PG_FREE_IF_COPY(geom2, 1);
2861 
2862  PG_RETURN_BOOL(result);
2863 }
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:371
void error_if_srid_mismatch(int srid1, int srid2)
Definition: lwutil.c:341
int gserialized_is_empty(const GSERIALIZED *g)
Check if a GSERIALIZED is empty without deserializing first.
Definition: g_serialized.c:139
void lwgeom_geos_error(const char *fmt,...)
#define LW_FALSE
Definition: liblwgeom.h:62
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:300
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:69
void errorIfGeometryCollection(GSERIALIZED *g1, GSERIALIZED *g2)
Throws an ereport ERROR if either geometry is a COLLECTIONTYPE.
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