PostGIS  2.3.8dev-r@@SVN_REVISION@@

◆ LWGEOM_shortestline2d()

Datum LWGEOM_shortestline2d ( PG_FUNCTION_ARGS  )

Definition at line 638 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().

639 {
640  GSERIALIZED *result;
641  GSERIALIZED *geom1 = PG_GETARG_GSERIALIZED_P(0);
642  GSERIALIZED *geom2 = PG_GETARG_GSERIALIZED_P(1);
643  LWGEOM *theline;
644  LWGEOM *lwgeom1 = lwgeom_from_gserialized(geom1);
645  LWGEOM *lwgeom2 = lwgeom_from_gserialized(geom2);
646 
647  error_if_srid_mismatch(lwgeom1->srid, lwgeom2->srid);
648 
649  theline = lwgeom_closest_line(lwgeom1, lwgeom2);
650 
651  if (lwgeom_is_empty(theline))
652  PG_RETURN_NULL();
653 
654  result = geometry_serialize(theline);
655  lwgeom_free(theline);
656  lwgeom_free(lwgeom1);
657  lwgeom_free(lwgeom2);
658 
659  PG_FREE_IF_COPY(geom1, 0);
660  PG_FREE_IF_COPY(geom2, 1);
661  PG_RETURN_POINTER(result);
662 }
LWGEOM * lwgeom_from_gserialized(const GSERIALIZED *g)
Allocate a new LWGEOM from a GSERIALIZED.
void lwgeom_free(LWGEOM *geom)
Definition: lwgeom.c:1063
void error_if_srid_mismatch(int srid1, int srid2)
Definition: lwutil.c:369
int32_t srid
Definition: liblwgeom.h:398
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:1310
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