PostGIS  3.1.6dev-r@@SVN_REVISION@@

◆ touches()

Datum touches ( PG_FUNCTION_ARGS  )

Definition at line 2468 of file postgis/lwgeom_geos.c.

2469 {
2470  GSERIALIZED *geom1;
2471  GSERIALIZED *geom2;
2472  GEOSGeometry *g1, *g2;
2473  char result;
2474  GBOX box1, box2;
2475 
2476  geom1 = PG_GETARG_GSERIALIZED_P(0);
2477  geom2 = PG_GETARG_GSERIALIZED_P(1);
2478  gserialized_error_if_srid_mismatch(geom1, geom2, __func__);
2479 
2480  /* A.Touches(Empty) == FALSE */
2481  if ( gserialized_is_empty(geom1) || gserialized_is_empty(geom2) )
2482  PG_RETURN_BOOL(false);
2483 
2484  /*
2485  * short-circuit 1: if geom2 bounding box does not overlap
2486  * geom1 bounding box we can return FALSE.
2487  */
2488  if ( gserialized_get_gbox_p(geom1, &box1) &&
2489  gserialized_get_gbox_p(geom2, &box2) )
2490  {
2491  if ( gbox_overlaps_2d(&box1, &box2) == LW_FALSE )
2492  {
2493  PG_RETURN_BOOL(false);
2494  }
2495  }
2496 
2497  initGEOS(lwpgnotice, lwgeom_geos_error);
2498 
2499  g1 = POSTGIS2GEOS(geom1 );
2500  if (!g1)
2501  HANDLE_GEOS_ERROR("First argument geometry could not be converted to GEOS");
2502 
2503  g2 = POSTGIS2GEOS(geom2 );
2504  if (!g2)
2505  {
2506  GEOSGeom_destroy(g1);
2507  HANDLE_GEOS_ERROR("Second argument geometry could not be converted to GEOS");
2508  }
2509 
2510  result = GEOSTouches(g1,g2);
2511 
2512  GEOSGeom_destroy(g1);
2513  GEOSGeom_destroy(g2);
2514 
2515  if (result == 2) HANDLE_GEOS_ERROR("GEOSTouches");
2516 
2517  PG_FREE_IF_COPY(geom1, 0);
2518  PG_FREE_IF_COPY(geom2, 1);
2519 
2520  PG_RETURN_BOOL(result);
2521 }
char result[OUT_DOUBLE_BUFFER_SIZE]
Definition: cu_print.c:267
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: gbox.c:323
void gserialized_error_if_srid_mismatch(const GSERIALIZED *g1, const GSERIALIZED *g2, const char *funcname)
Definition: gserialized.c:404
int gserialized_get_gbox_p(const GSERIALIZED *g, GBOX *gbox)
Read the box from the GSERIALIZED or calculate it if necessary.
Definition: gserialized.c:65
int gserialized_is_empty(const GSERIALIZED *g)
Check if a GSERIALIZED is empty without deserializing first.
Definition: gserialized.c:152
void lwgeom_geos_error(const char *fmt,...)
#define LW_FALSE
Definition: liblwgeom.h:108
#define HANDLE_GEOS_ERROR(label)
GEOSGeometry * POSTGIS2GEOS(const GSERIALIZED *pglwgeom)

References gbox_overlaps_2d(), gserialized_error_if_srid_mismatch(), gserialized_get_gbox_p(), gserialized_is_empty(), HANDLE_GEOS_ERROR, LW_FALSE, lwgeom_geos_error(), POSTGIS2GEOS(), and result.

Referenced by rt_raster_touches().

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