PostGIS  2.5.0dev-r@@SVN_REVISION@@
Datum crosses ( PG_FUNCTION_ARGS  )

Definition at line 2211 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(), and POSTGIS2GEOS().

2212 {
2213  GSERIALIZED *geom1;
2214  GSERIALIZED *geom2;
2215  GEOSGeometry *g1, *g2;
2216  int result;
2217  GBOX box1, box2;
2218 
2219  geom1 = PG_GETARG_GSERIALIZED_P(0);
2220  geom2 = PG_GETARG_GSERIALIZED_P(1);
2221 
2222  errorIfGeometryCollection(geom1,geom2);
2224 
2225  /* A.Crosses(Empty) == FALSE */
2226  if ( gserialized_is_empty(geom1) || gserialized_is_empty(geom2) )
2227  PG_RETURN_BOOL(false);
2228 
2229  /*
2230  * short-circuit 1: if geom2 bounding box does not overlap
2231  * geom1 bounding box we can prematurely return FALSE.
2232  */
2233  if ( gserialized_get_gbox_p(geom1, &box1) &&
2234  gserialized_get_gbox_p(geom2, &box2) )
2235  {
2236  if ( gbox_overlaps_2d(&box1, &box2) == LW_FALSE )
2237  {
2238  PG_RETURN_BOOL(false);
2239  }
2240  }
2241 
2242  initGEOS(lwpgnotice, lwgeom_geos_error);
2243 
2244  g1 = (GEOSGeometry *)POSTGIS2GEOS(geom1);
2245  if (!g1)
2246  HANDLE_GEOS_ERROR("First argument geometry could not be converted to GEOS");
2247 
2248  g2 = (GEOSGeometry *)POSTGIS2GEOS(geom2);
2249  if (!g2)
2250  {
2251  GEOSGeom_destroy(g1);
2253  "Second argument geometry could not be converted to GEOS");
2254  }
2255 
2256  result = GEOSCrosses(g1,g2);
2257 
2258  GEOSGeom_destroy(g1);
2259  GEOSGeom_destroy(g2);
2260 
2261  if (result == 2) HANDLE_GEOS_ERROR("GEOSCrosses");
2262 
2263  PG_FREE_IF_COPY(geom1, 0);
2264  PG_FREE_IF_COPY(geom2, 1);
2265 
2266  PG_RETURN_BOOL(result);
2267 }
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:639
void error_if_srid_mismatch(int srid1, int srid2)
Definition: lwutil.c:338
int gserialized_is_empty(const GSERIALIZED *g)
Check if a GSERIALIZED is empty without deserializing first.
Definition: g_serialized.c:178
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:330
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:99
void errorIfGeometryCollection(GSERIALIZED *g1, GSERIALIZED *g2)
Throws an ereport ERROR if either geometry is a COLLECTIONTYPE.

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