PostGIS  2.2.8dev-r@@SVN_REVISION@@

◆ LWGEOM_closestpoint()

Datum LWGEOM_closestpoint ( PG_FUNCTION_ARGS  )

Definition at line 593 of file lwgeom_functions_basic.c.

References error_if_srid_mismatch(), geometry_serialize(), lwgeom_closest_point(), lwgeom_free(), lwgeom_from_gserialized(), lwgeom_is_empty(), LWGEOM_shortestline2d(), PG_FUNCTION_INFO_V1(), and LWGEOM::srid.

Referenced by LWGEOM_force_sfs().

594 {
595  GSERIALIZED *result;
596  GSERIALIZED *geom1 = PG_GETARG_GSERIALIZED_P(0);
597  GSERIALIZED *geom2 = PG_GETARG_GSERIALIZED_P(1);
598  LWGEOM *point;
599  LWGEOM *lwgeom1 = lwgeom_from_gserialized(geom1);
600  LWGEOM *lwgeom2 = lwgeom_from_gserialized(geom2);
601 
602  error_if_srid_mismatch(lwgeom1->srid, lwgeom2->srid);
603 
604  point = lwgeom_closest_point(lwgeom1, lwgeom2);
605 
606  if (lwgeom_is_empty(point))
607  PG_RETURN_NULL();
608 
609  result = geometry_serialize(point);
610  lwgeom_free(point);
611  lwgeom_free(lwgeom1);
612  lwgeom_free(lwgeom2);
613 
614  PG_FREE_IF_COPY(geom1, 0);
615  PG_FREE_IF_COPY(geom2, 1);
616  PG_RETURN_POINTER(result);
617 }
LWGEOM * lwgeom_closest_point(const LWGEOM *lw1, const LWGEOM *lw2)
Definition: measures.c:40
LWGEOM * lwgeom_from_gserialized(const GSERIALIZED *g)
Allocate a new LWGEOM from a GSERIALIZED.
void lwgeom_free(LWGEOM *geom)
Definition: lwgeom.c:1050
void error_if_srid_mismatch(int srid1, int srid2)
Definition: lwutil.c:341
int32_t srid
Definition: liblwgeom.h:383
GSERIALIZED * geometry_serialize(LWGEOM *lwgeom)
int lwgeom_is_empty(const LWGEOM *geom)
Return true or false depending on whether a geometry is an "empty" geometry (no vertices members) ...
Definition: lwgeom.c:1297
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