PostGIS  2.5.0beta1dev-r@@SVN_REVISION@@

◆ lwgeom_linemerge()

LWGEOM* lwgeom_linemerge ( const LWGEOM geom1)

Definition at line 641 of file liblwgeom/lwgeom_geos.c.

References LWGEOM::flags, FLAGS_GET_Z, geos_clean(), geos_clean_and_fail(), get_result_srid(), input_lwgeom_to_geos(), lwgeom_clone_deep(), lwgeom_geos_error(), lwgeom_is_empty(), lwnotice(), output_geos_as_lwgeom(), and SRID_INVALID.

Referenced by _lwt_AddLine(), linemerge(), and test_geos_linemerge().

642 {
643  LWGEOM* result;
644  int32_t srid = get_result_srid(geom, NULL, __func__);
645  uint8_t is3d = FLAGS_GET_Z(geom->flags);
646  GEOSGeometry* g1;
647  GEOSGeometry* g3;
649  if (srid == SRID_INVALID) return NULL;
651  /* Empty.Linemerge() == Empty */
652  if (lwgeom_is_empty(geom)) return lwgeom_clone_deep(geom); /* match empty type to linestring? */
654  initGEOS(lwnotice, lwgeom_geos_error);
656  if (!input_lwgeom_to_geos(&g1, geom, __func__)) return NULL;
658  g3 = GEOSLineMerge(g1);
660  if (!g3) return geos_clean_and_fail(g1, NULL, NULL, __func__);
662  if (!output_geos_as_lwgeom(&g3, &result, srid, is3d, __func__))
663  return geos_clean_and_fail(g1, NULL, g3, __func__);
665  geos_clean(g1, NULL, g3);
667  return result;
668 }
void lwnotice(const char *fmt,...)
Write a notice out to the notice handler.
Definition: lwutil.c:177
static LWGEOM * geos_clean_and_fail(GEOSGeometry *g1, GEOSGeometry *g2, GEOSGeometry *g3, const char *funcname)
LWGEOM * lwgeom_clone_deep(const LWGEOM *lwgeom)
Deep clone an LWGEOM, everything is copied.
Definition: lwgeom.c:520
static uint8_t output_geos_as_lwgeom(GEOSGeometry **g, LWGEOM **geom, const int32_t srid, const uint8_t is3d, const char *funcname)
void lwgeom_geos_error(const char *fmt,...)
static void geos_clean(GEOSGeometry *g1, GEOSGeometry *g2, GEOSGeometry *g3)
Definition: liblwgeom.h:191
#define FLAGS_GET_Z(flags)
Macros for manipulating the 'flags' byte.
Definition: liblwgeom.h:139
static uint8_t input_lwgeom_to_geos(GEOSGeometry **g, const LWGEOM *geom, const char *funcname)
static int32_t get_result_srid(const LWGEOM *geom1, const LWGEOM *geom2, const char *funcname)
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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