PostGIS  2.5.0beta1dev-r@@SVN_REVISION@@

◆ LWGEOM_shortestline2d()

Datum LWGEOM_shortestline2d ( PG_FUNCTION_ARGS  )

Definition at line 642 of file lwgeom_functions_basic.c.

References error_if_srid_mismatch(), geometry_serialize(), lwgeom_closest_line(), lwgeom_free(), lwgeom_from_gserialized(), lwgeom_is_empty(), LWGEOM_longestline2d(), PG_FUNCTION_INFO_V1(), and LWGEOM::srid.

Referenced by LWGEOM_closestpoint().

643 {
644  GSERIALIZED *result;
645  GSERIALIZED *geom1 = PG_GETARG_GSERIALIZED_P(0);
646  GSERIALIZED *geom2 = PG_GETARG_GSERIALIZED_P(1);
647  LWGEOM *theline;
648  LWGEOM *lwgeom1 = lwgeom_from_gserialized(geom1);
649  LWGEOM *lwgeom2 = lwgeom_from_gserialized(geom2);
650 
651  error_if_srid_mismatch(lwgeom1->srid, lwgeom2->srid);
652 
653  theline = lwgeom_closest_line(lwgeom1, lwgeom2);
654 
655  if (lwgeom_is_empty(theline))
656  PG_RETURN_NULL();
657 
658  result = geometry_serialize(theline);
659  lwgeom_free(theline);
660  lwgeom_free(lwgeom1);
661  lwgeom_free(lwgeom2);
662 
663  PG_FREE_IF_COPY(geom1, 0);
664  PG_FREE_IF_COPY(geom2, 1);
665  PG_RETURN_POINTER(result);
666 }
LWGEOM * lwgeom_from_gserialized(const GSERIALIZED *g)
Allocate a new LWGEOM from a GSERIALIZED.
void lwgeom_free(LWGEOM *geom)
Definition: lwgeom.c:1144
void error_if_srid_mismatch(int srid1, int srid2)
Definition: lwutil.c:338
int32_t srid
Definition: liblwgeom.h:401
GSERIALIZED * geometry_serialize(LWGEOM *lwgeom)
LWGEOM * lwgeom_closest_line(const LWGEOM *lw1, const LWGEOM *lw2)
Definition: measures.c:42
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:1393
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