PostGIS  3.0.0dev-r@@SVN_REVISION@@

◆ LWGEOM_shortestline2d()

Datum LWGEOM_shortestline2d ( PG_FUNCTION_ARGS  )

Definition at line 641 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().

642 {
643  GSERIALIZED *result;
644  GSERIALIZED *geom1 = PG_GETARG_GSERIALIZED_P(0);
645  GSERIALIZED *geom2 = PG_GETARG_GSERIALIZED_P(1);
646  LWGEOM *theline;
647  LWGEOM *lwgeom1 = lwgeom_from_gserialized(geom1);
648  LWGEOM *lwgeom2 = lwgeom_from_gserialized(geom2);
649 
650  error_if_srid_mismatch(lwgeom1->srid, lwgeom2->srid);
651 
652  theline = lwgeom_closest_line(lwgeom1, lwgeom2);
653 
654  if (lwgeom_is_empty(theline))
655  PG_RETURN_NULL();
656 
657  result = geometry_serialize(theline);
658  lwgeom_free(theline);
659  lwgeom_free(lwgeom1);
660  lwgeom_free(lwgeom2);
661 
662  PG_FREE_IF_COPY(geom1, 0);
663  PG_FREE_IF_COPY(geom2, 1);
664  PG_RETURN_POINTER(result);
665 }
LWGEOM * lwgeom_from_gserialized(const GSERIALIZED *g)
Allocate a new LWGEOM from a GSERIALIZED.
void lwgeom_free(LWGEOM *geom)
Definition: lwgeom.c:1128
void error_if_srid_mismatch(int srid1, int srid2)
Definition: lwutil.c:336
int32_t srid
Definition: liblwgeom.h:401
static int lwgeom_is_empty(const LWGEOM *geom)
Return true or false depending on whether a geometry is an "empty" geometry (no vertices members) ...
Definition: lwinline.h:172
GSERIALIZED * geometry_serialize(LWGEOM *lwgeom)
LWGEOM * lwgeom_closest_line(const LWGEOM *lw1, const LWGEOM *lw2)
Definition: measures.c:42
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