PostGIS  2.5.0beta2dev-r@@SVN_REVISION@@

◆ geos_intersects()

Datum geos_intersects ( PG_FUNCTION_ARGS  )

Definition at line 2141 of file postgis/lwgeom_geos.c.

References error_if_srid_mismatch(), errorIfGeometryCollection(), gbox_overlaps_2d(), PrepGeomCache::gcache, LWMPOINT::geoms, GetPrepGeomCache(), GetRtreeCache(), gserialized_get_gbox_p(), gserialized_get_srid(), gserialized_get_type(), gserialized_is_empty(), HANDLE_GEOS_ERROR, is_point(), is_poly(), LW_FALSE, LW_TRUE, lwgeom_as_lwmpoint(), lwgeom_as_lwpoint(), lwgeom_free(), lwgeom_from_gserialized(), lwgeom_geos_error(), lwmpoint_free(), MULTIPOINTTYPE, LWMPOINT::ngeoms, PG_FUNCTION_INFO_V1(), pip_short_circuit(), POINTTYPE, POSTGIS2GEOS(), PrepGeomCache::prepared_geom, and touches().

Referenced by crosses().

2142 {
2143  GSERIALIZED *geom1;
2144  GSERIALIZED *geom2;
2145  int result;
2146  GBOX box1, box2;
2147  PrepGeomCache *prep_cache;
2148 
2149  geom1 = PG_GETARG_GSERIALIZED_P(0);
2150  geom2 = PG_GETARG_GSERIALIZED_P(1);
2151 
2152  errorIfGeometryCollection(geom1,geom2);
2154 
2155  /* A.Intersects(Empty) == FALSE */
2156  if ( gserialized_is_empty(geom1) || gserialized_is_empty(geom2) )
2157  PG_RETURN_BOOL(false);
2158 
2159  /*
2160  * short-circuit 1: if geom2 bounding box does not overlap
2161  * geom1 bounding box we can return FALSE.
2162  */
2163  if ( gserialized_get_gbox_p(geom1, &box1) &&
2164  gserialized_get_gbox_p(geom2, &box2) )
2165  {
2166  if ( gbox_overlaps_2d(&box1, &box2) == LW_FALSE )
2167  {
2168  PG_RETURN_BOOL(false);
2169  }
2170  }
2171 
2172  /*
2173  * short-circuit 2: if the geoms are a point and a polygon,
2174  * call the point_outside_polygon function.
2175  */
2176  if ((is_point(geom1) && is_poly(geom2)) || (is_poly(geom1) && is_point(geom2)))
2177  {
2178  GSERIALIZED* gpoly = is_poly(geom1) ? geom1 : geom2;
2179  GSERIALIZED* gpoint = is_point(geom1) ? geom1 : geom2;
2180  RTREE_POLY_CACHE* cache = GetRtreeCache(fcinfo, gpoly);
2181  int retval;
2182 
2183  POSTGIS_DEBUG(3, "Point in Polygon test requested...short-circuiting.");
2184  if (gserialized_get_type(gpoint) == POINTTYPE)
2185  {
2186  LWGEOM* point = lwgeom_from_gserialized(gpoint);
2187  int pip_result = pip_short_circuit(cache, lwgeom_as_lwpoint(point), gpoly);
2188  lwgeom_free(point);
2189 
2190  retval = (pip_result != -1); /* not outside */
2191  }
2192  else if (gserialized_get_type(gpoint) == MULTIPOINTTYPE)
2193  {
2195  uint32_t i;
2196 
2197  retval = LW_FALSE;
2198  for (i = 0; i < mpoint->ngeoms; i++)
2199  {
2200  int pip_result = pip_short_circuit(cache, mpoint->geoms[i], gpoly);
2201  if (pip_result != -1) /* not outside */
2202  {
2203  retval = LW_TRUE;
2204  break;
2205  }
2206  }
2207 
2208  lwmpoint_free(mpoint);
2209  }
2210  else
2211  {
2212  /* Never get here */
2213  elog(ERROR,"Type isn't point or multipoint!");
2214  PG_RETURN_NULL();
2215  }
2216 
2217  PG_FREE_IF_COPY(geom1, 0);
2218  PG_FREE_IF_COPY(geom2, 1);
2219  PG_RETURN_BOOL(retval);
2220  }
2221 
2222  initGEOS(lwpgnotice, lwgeom_geos_error);
2223  prep_cache = GetPrepGeomCache( fcinfo, geom1, geom2 );
2224 
2225  if ( prep_cache && prep_cache->prepared_geom )
2226  {
2227  if ( prep_cache->gcache.argnum == 1 )
2228  {
2229  GEOSGeometry *g = POSTGIS2GEOS(geom2);
2230  if (!g) HANDLE_GEOS_ERROR("Geometry could not be converted to GEOS");
2231  result = GEOSPreparedIntersects( prep_cache->prepared_geom, g);
2232  GEOSGeom_destroy(g);
2233  }
2234  else
2235  {
2236  GEOSGeometry *g = POSTGIS2GEOS(geom1);
2237  if (!g)
2238  HANDLE_GEOS_ERROR("Geometry could not be converted to GEOS");
2239  result = GEOSPreparedIntersects( prep_cache->prepared_geom, g);
2240  GEOSGeom_destroy(g);
2241  }
2242  }
2243  else
2244  {
2245  GEOSGeometry *g1;
2246  GEOSGeometry *g2;
2247  g1 = POSTGIS2GEOS(geom1);
2248  if (!g1) HANDLE_GEOS_ERROR("First argument geometry could not be converted to GEOS");
2249  g2 = POSTGIS2GEOS(geom2);
2250  if (!g2)
2251  {
2252  GEOSGeom_destroy(g1);
2253  HANDLE_GEOS_ERROR("Second argument geometry could not be converted to GEOS");
2254  }
2255  result = GEOSIntersects( g1, g2);
2256  GEOSGeom_destroy(g1);
2257  GEOSGeom_destroy(g2);
2258  }
2259 
2260  if (result == 2) HANDLE_GEOS_ERROR("GEOSIntersects");
2261 
2262  PG_FREE_IF_COPY(geom1, 0);
2263  PG_FREE_IF_COPY(geom2, 1);
2264 
2265  PG_RETURN_BOOL(result);
2266 }
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
uint32_t gserialized_get_type(const GSERIALIZED *s)
Extract the geometry type from the serialized form (it hides in the anonymous data area...
Definition: g_serialized.c:86
uint32_t ngeoms
Definition: liblwgeom.h:470
const GEOSPreparedGeometry * prepared_geom
static char is_poly(const GSERIALIZED *g)
LWGEOM * lwgeom_from_gserialized(const GSERIALIZED *g)
Allocate a new LWGEOM from a GSERIALIZED.
void lwgeom_free(LWGEOM *geom)
Definition: lwgeom.c:1144
#define MULTIPOINTTYPE
Definition: liblwgeom.h:87
The tree structure used for fast P-i-P tests by point_in_multipolygon_rtree()
Definition: lwgeom_rtree.h:58
void error_if_srid_mismatch(int srid1, int srid2)
Definition: lwutil.c:338
LWPOINT * lwgeom_as_lwpoint(const LWGEOM *lwgeom)
Definition: lwgeom.c:161
static char is_point(const GSERIALIZED *g)
int gserialized_is_empty(const GSERIALIZED *g)
Check if a GSERIALIZED is empty without deserializing first.
Definition: g_serialized.c:178
unsigned int uint32_t
Definition: uthash.h:78
void lwmpoint_free(LWMPOINT *mpt)
Definition: lwmpoint.c:72
void lwgeom_geos_error(const char *fmt,...)
#define LW_FALSE
Definition: liblwgeom.h:76
#define LW_TRUE
Return types for functions with status returns.
Definition: liblwgeom.h:75
LWPOINT ** geoms
Definition: liblwgeom.h:472
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 POINTTYPE
LWTYPE numbers, used internally by PostGIS.
Definition: liblwgeom.h:84
LWMPOINT * lwgeom_as_lwmpoint(const LWGEOM *lwgeom)
Definition: lwgeom.c:233
PrepGeomCache * GetPrepGeomCache(FunctionCallInfoData *fcinfo, GSERIALIZED *g1, GSERIALIZED *g2)
Given a couple potential geometries and a function call context, return a prepared structure for one ...
#define HANDLE_GEOS_ERROR(label)
RTREE_POLY_CACHE * GetRtreeCache(FunctionCallInfoData *fcinfo, GSERIALIZED *g1)
Checks for a cache hit against the provided geometry and returns a pre-built index structure (RTREE_P...
Definition: lwgeom_rtree.c:432
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
static int pip_short_circuit(RTREE_POLY_CACHE *poly_cache, LWPOINT *point, GSERIALIZED *gpoly)
void errorIfGeometryCollection(GSERIALIZED *g1, GSERIALIZED *g2)
Throws an ereport ERROR if either geometry is a COLLECTIONTYPE.
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