PostGIS  3.1.6dev-r@@SVN_REVISION@@

◆ lwgeom_union_prec()

LWGEOM* lwgeom_union_prec ( const LWGEOM geom1,
const LWGEOM geom2,
double  gridSize 
)

Definition at line 1018 of file liblwgeom/lwgeom_geos.c.

1019 {
1020  LWGEOM* result;
1021  int32_t srid = RESULT_SRID(geom1, geom2);
1022  uint8_t is3d = (FLAGS_GET_Z(geom1->flags) || FLAGS_GET_Z(geom2->flags));
1023  GEOSGeometry *g1, *g2, *g3;
1024 
1025  if (srid == SRID_INVALID) return NULL;
1026 
1027  /* A.Union(empty) == A */
1028  if (lwgeom_is_empty(geom1)) return lwgeom_clone_deep(geom2);
1029 
1030  /* B.Union(empty) == B */
1031  if (lwgeom_is_empty(geom2)) return lwgeom_clone_deep(geom1);
1032 
1033  initGEOS(lwnotice, lwgeom_geos_error);
1034 
1035  if (!(g1 = LWGEOM2GEOS(geom1, AUTOFIX))) GEOS_FAIL();
1036  if (!(g2 = LWGEOM2GEOS(geom2, AUTOFIX))) GEOS_FREE_AND_FAIL(g1);
1037 
1038  if ( gridSize >= 0) {
1039 #if POSTGIS_GEOS_VERSION < 39
1040  lwerror("Fixed-precision union requires GEOS-3.9 or higher");
1041  GEOS_FREE_AND_FAIL(g1, g2);
1042  return NULL;
1043 #else
1044  g3 = GEOSUnionPrec(g1, g2, gridSize);
1045 #endif
1046  }
1047  else
1048  {
1049  g3 = GEOSUnion(g1, g2);
1050  }
1051 
1052  if (!g3) GEOS_FREE_AND_FAIL(g1, g2);
1053  GEOSSetSRID(g3, srid);
1054 
1055  if (!(result = GEOS2LWGEOM(g3, is3d)))
1056  GEOS_FREE_AND_FAIL(g1, g2, g3);
1057 
1058  GEOS_FREE(g1, g2, g3);
1059  return result;
1060 }
char result[OUT_DOUBLE_BUFFER_SIZE]
Definition: cu_print.c:267
#define GEOS_FREE(...)
#define AUTOFIX
#define RESULT_SRID(...)
#define GEOS_FAIL()
#define GEOS_FREE_AND_FAIL(...)
GEOSGeometry * LWGEOM2GEOS(const LWGEOM *lwgeom, uint8_t autofix)
LWGEOM * GEOS2LWGEOM(const GEOSGeometry *geom, uint8_t want3d)
void lwgeom_geos_error(const char *fmt,...)
#define SRID_INVALID
Definition: liblwgeom.h:233
LWGEOM * lwgeom_clone_deep(const LWGEOM *lwgeom)
Deep clone an LWGEOM, everything is copied.
Definition: lwgeom.c:512
#define FLAGS_GET_Z(flags)
Definition: liblwgeom.h:179
void lwerror(const char *fmt,...)
Write a notice out to the error handler.
Definition: lwutil.c:190
void lwnotice(const char *fmt,...)
Write a notice out to the notice handler.
Definition: lwutil.c:177
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:203
lwflags_t flags
Definition: liblwgeom.h:475

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

Referenced by lwgeom_union(), and ST_Union().

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