PostGIS  2.5.7dev-r@@SVN_REVISION@@

◆ lwgeom_linemerge()

LWGEOM* lwgeom_linemerge ( const LWGEOM geom1)

Definition at line 694 of file liblwgeom/lwgeom_geos.c.

695 {
696  LWGEOM* result;
697  int32_t srid = RESULT_SRID(geom);
698  uint8_t is3d = FLAGS_GET_Z(geom->flags);
699  GEOSGeometry* g1;
700  GEOSGeometry* g3;
702  if (srid == SRID_INVALID) return NULL;
704  /* Empty.Linemerge() == Empty */
705  if (lwgeom_is_empty(geom)) return lwgeom_clone_deep(geom); /* match empty type to linestring? */
707  initGEOS(lwnotice, lwgeom_geos_error);
709  if (!(g1 = LWGEOM2GEOS(geom, AUTOFIX))) GEOS_FAIL();
711  g3 = GEOSLineMerge(g1);
713  if (!g3) GEOS_FREE_AND_FAIL(g1);
714  GEOSSetSRID(g3, srid);
716  if (!(result = GEOS2LWGEOM(g3, is3d)))
717  GEOS_FREE_AND_FAIL(g1, g3);
719  GEOS_FREE(g1, g3);
721  return result;
722 }
#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,...)
Definition: liblwgeom.h:192
LWGEOM * lwgeom_clone_deep(const LWGEOM *lwgeom)
Deep clone an LWGEOM, everything is copied.
Definition: lwgeom.c:520
#define FLAGS_GET_Z(flags)
Macros for manipulating the 'flags' byte.
Definition: liblwgeom.h:140
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
void lwnotice(const char *fmt,...)
Write a notice out to the notice handler.
Definition: lwutil.c:177
unsigned char uint8_t
Definition: uthash.h:79

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(), linemerge(), and test_geos_linemerge().

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