PostGIS  2.3.8dev-r@@SVN_REVISION@@

◆ crosses()

Datum crosses ( PG_FUNCTION_ARGS  )

Definition at line 2226 of file postgis/lwgeom_geos.c.

References error_if_srid_mismatch(), errorIfGeometryCollection(), FALSE, gbox_overlaps_2d(), geos_intersects(), gserialized_get_gbox_p(), gserialized_get_srid(), gserialized_is_empty(), HANDLE_GEOS_ERROR, LW_FALSE, lwgeom_geos_error(), PG_FUNCTION_INFO_V1(), and POSTGIS2GEOS().

Referenced by coveredby().

2227 {
2228  GSERIALIZED *geom1;
2229  GSERIALIZED *geom2;
2230  GEOSGeometry *g1, *g2;
2231  int result;
2232  GBOX box1, box2;
2233 
2234  geom1 = PG_GETARG_GSERIALIZED_P(0);
2235  geom2 = PG_GETARG_GSERIALIZED_P(1);
2236 
2237  errorIfGeometryCollection(geom1,geom2);
2239 
2240  /* A.Crosses(Empty) == FALSE */
2241  if ( gserialized_is_empty(geom1) || gserialized_is_empty(geom2) )
2242  PG_RETURN_BOOL(false);
2243 
2244  /*
2245  * short-circuit 1: if geom2 bounding box does not overlap
2246  * geom1 bounding box we can prematurely return FALSE.
2247  */
2248  if ( gserialized_get_gbox_p(geom1, &box1) &&
2249  gserialized_get_gbox_p(geom2, &box2) )
2250  {
2251  if ( gbox_overlaps_2d(&box1, &box2) == LW_FALSE )
2252  {
2253  PG_RETURN_BOOL(FALSE);
2254  }
2255  }
2256 
2257  initGEOS(lwpgnotice, lwgeom_geos_error);
2258 
2259  g1 = (GEOSGeometry *)POSTGIS2GEOS(geom1);
2260  if ( 0 == g1 ) /* exception thrown at construction */
2261  {
2262  HANDLE_GEOS_ERROR("First argument geometry could not be converted to GEOS");
2263  PG_RETURN_NULL();
2264  }
2265 
2266  g2 = (GEOSGeometry *)POSTGIS2GEOS(geom2);
2267  if ( 0 == g2 ) /* exception thrown at construction */
2268  {
2269  HANDLE_GEOS_ERROR("Second argument geometry could not be converted to GEOS");
2270  GEOSGeom_destroy(g1);
2271  PG_RETURN_NULL();
2272  }
2273 
2274  result = GEOSCrosses(g1,g2);
2275 
2276  GEOSGeom_destroy(g1);
2277  GEOSGeom_destroy(g2);
2278 
2279  if (result == 2)
2280  {
2281  HANDLE_GEOS_ERROR("GEOSCrosses");
2282  PG_RETURN_NULL(); /* never get here */
2283  }
2284 
2285  PG_FREE_IF_COPY(geom1, 0);
2286  PG_FREE_IF_COPY(geom2, 1);
2287 
2288  PG_RETURN_BOOL(result);
2289 }
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
#define FALSE
Definition: dbfopen.c:168
GEOSGeometry * POSTGIS2GEOS(GSERIALIZED *pglwgeom)
#define HANDLE_GEOS_ERROR(label)
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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