PostGIS  2.5.1dev-r@@SVN_REVISION@@

◆ touches()

Datum touches ( PG_FUNCTION_ARGS  )

Definition at line 2269 of file postgis/lwgeom_geos.c.

References disjoint(), 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(), and POSTGIS2GEOS().

Referenced by geos_intersects().

2270 {
2271  GSERIALIZED *geom1;
2272  GSERIALIZED *geom2;
2273  GEOSGeometry *g1, *g2;
2274  char result;
2275  GBOX box1, box2;
2276 
2277  geom1 = PG_GETARG_GSERIALIZED_P(0);
2278  geom2 = PG_GETARG_GSERIALIZED_P(1);
2279 
2280  errorIfGeometryCollection(geom1,geom2);
2282 
2283  /* A.Touches(Empty) == FALSE */
2284  if ( gserialized_is_empty(geom1) || gserialized_is_empty(geom2) )
2285  PG_RETURN_BOOL(false);
2286 
2287  /*
2288  * short-circuit 1: if geom2 bounding box does not overlap
2289  * geom1 bounding box we can return FALSE.
2290  */
2291  if ( gserialized_get_gbox_p(geom1, &box1) &&
2292  gserialized_get_gbox_p(geom2, &box2) )
2293  {
2294  if ( gbox_overlaps_2d(&box1, &box2) == LW_FALSE )
2295  {
2296  PG_RETURN_BOOL(false);
2297  }
2298  }
2299 
2300  initGEOS(lwpgnotice, lwgeom_geos_error);
2301 
2302  g1 = POSTGIS2GEOS(geom1 );
2303  if (!g1)
2304  HANDLE_GEOS_ERROR("First argument geometry could not be converted to GEOS");
2305 
2306  g2 = POSTGIS2GEOS(geom2 );
2307  if (!g2)
2308  {
2309  GEOSGeom_destroy(g1);
2310  HANDLE_GEOS_ERROR("Second argument geometry could not be converted to GEOS");
2311  }
2312 
2313  result = GEOSTouches(g1,g2);
2314 
2315  GEOSGeom_destroy(g1);
2316  GEOSGeom_destroy(g2);
2317 
2318  if (result == 2) HANDLE_GEOS_ERROR("GEOSTouches");
2319 
2320  PG_FREE_IF_COPY(geom1, 0);
2321  PG_FREE_IF_COPY(geom2, 1);
2322 
2323  PG_RETURN_BOOL(result);
2324 }
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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