PostGIS  2.5.0beta2dev-r@@SVN_REVISION@@

◆ lwgeom_unaryunion()

LWGEOM* lwgeom_unaryunion ( const LWGEOM geom1)

Definition at line 680 of file liblwgeom/lwgeom_geos.c.

References AUTOFIX, LWGEOM::flags, FLAGS_GET_Z, GEOS2LWGEOM(), GEOS_FAIL, GEOS_FREE, GEOS_FREE_AND_FAIL, LWGEOM2GEOS(), lwgeom_clone_deep(), lwgeom_geos_error(), lwgeom_is_empty(), lwnotice(), RESULT_SRID, and SRID_INVALID.

Referenced by _lwt_AddLine(), lwgeom_split_wrapx(), and ST_UnaryUnion().

681 {
682  LWGEOM* result;
683  int32_t srid = RESULT_SRID(geom);
684  uint8_t is3d = FLAGS_GET_Z(geom->flags);
685  GEOSGeometry* g1;
686  GEOSGeometry* g3;
687 
688  if (srid == SRID_INVALID) return NULL;
689 
690  /* Empty.UnaryUnion() == Empty */
691  if (lwgeom_is_empty(geom)) return lwgeom_clone_deep(geom);
692 
693  initGEOS(lwnotice, lwgeom_geos_error);
694 
695  if (!(g1 = LWGEOM2GEOS(geom, AUTOFIX))) GEOS_FAIL();
696 
697  g3 = GEOSUnaryUnion(g1);
698 
699  if (!g3) GEOS_FREE_AND_FAIL(g1);
700  GEOSSetSRID(g3, srid);
701 
702  if (!(result = GEOS2LWGEOM(g3, is3d)))
703  GEOS_FREE_AND_FAIL(g1, g3);
704 
705  GEOS_FREE(g1, g3);
706 
707  return result;
708 }
#define GEOS_FAIL()
LWGEOM * GEOS2LWGEOM(const GEOSGeometry *geom, uint8_t want3d)
void lwnotice(const char *fmt,...)
Write a notice out to the notice handler.
Definition: lwutil.c:177
#define GEOS_FREE_AND_FAIL(...)
#define GEOS_FREE(...)
LWGEOM * lwgeom_clone_deep(const LWGEOM *lwgeom)
Deep clone an LWGEOM, everything is copied.
Definition: lwgeom.c:520
#define RESULT_SRID(...)
#define AUTOFIX
void lwgeom_geos_error(const char *fmt,...)
#define SRID_INVALID
Definition: liblwgeom.h:191
#define FLAGS_GET_Z(flags)
Macros for manipulating the 'flags' byte.
Definition: liblwgeom.h:139
GEOSGeometry * LWGEOM2GEOS(const LWGEOM *lwgeom, uint8_t autofix)
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
unsigned char uint8_t
Definition: uthash.h:79
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