PostGIS  2.5.0beta1dev-r@@SVN_REVISION@@

◆ crosses()

Datum crosses ( PG_FUNCTION_ARGS  )

Definition at line 2083 of file postgis/lwgeom_geos.c.

References error_if_srid_mismatch(), errorIfGeometryCollection(), 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().

2084 {
2085  GSERIALIZED *geom1;
2086  GSERIALIZED *geom2;
2087  GEOSGeometry *g1, *g2;
2088  int result;
2089  GBOX box1, box2;
2090 
2091  geom1 = PG_GETARG_GSERIALIZED_P(0);
2092  geom2 = PG_GETARG_GSERIALIZED_P(1);
2093 
2094  errorIfGeometryCollection(geom1,geom2);
2096 
2097  /* A.Crosses(Empty) == FALSE */
2098  if ( gserialized_is_empty(geom1) || gserialized_is_empty(geom2) )
2099  PG_RETURN_BOOL(false);
2100 
2101  /*
2102  * short-circuit 1: if geom2 bounding box does not overlap
2103  * geom1 bounding box we can return FALSE.
2104  */
2105  if ( gserialized_get_gbox_p(geom1, &box1) &&
2106  gserialized_get_gbox_p(geom2, &box2) )
2107  {
2108  if ( gbox_overlaps_2d(&box1, &box2) == LW_FALSE )
2109  {
2110  PG_RETURN_BOOL(false);
2111  }
2112  }
2113 
2114  initGEOS(lwpgnotice, lwgeom_geos_error);
2115 
2116  g1 = POSTGIS2GEOS(geom1);
2117  if (!g1)
2118  HANDLE_GEOS_ERROR("First argument geometry could not be converted to GEOS");
2119 
2120  g2 = POSTGIS2GEOS(geom2);
2121  if (!g2)
2122  {
2123  GEOSGeom_destroy(g1);
2124  HANDLE_GEOS_ERROR("Second argument geometry could not be converted to GEOS");
2125  }
2126 
2127  result = GEOSCrosses(g1,g2);
2128 
2129  GEOSGeom_destroy(g1);
2130  GEOSGeom_destroy(g2);
2131 
2132  if (result == 2) HANDLE_GEOS_ERROR("GEOSCrosses");
2133 
2134  PG_FREE_IF_COPY(geom1, 0);
2135  PG_FREE_IF_COPY(geom2, 1);
2136 
2137  PG_RETURN_BOOL(result);
2138 }
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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