PostGIS  2.5.7dev-r@@SVN_REVISION@@

◆ lwgeom_pointonsurface()

LWGEOM* lwgeom_pointonsurface ( const LWGEOM geom)

Definition at line 855 of file liblwgeom/lwgeom_geos.c.

856 {
857  LWGEOM *result;
858  int32_t srid = RESULT_SRID(geom);
859  uint8_t is3d = FLAGS_GET_Z(geom->flags);
860  GEOSGeometry *g1, *g3;
862  if (srid == SRID_INVALID) return NULL;
864  if (lwgeom_is_empty(geom))
865  {
866  LWPOINT *lwp = lwpoint_construct_empty(srid, is3d, lwgeom_has_m(geom));
867  return lwpoint_as_lwgeom(lwp);
868  }
870  initGEOS(lwnotice, lwgeom_geos_error);
872  if (!(g1 = LWGEOM2GEOS(geom, AUTOFIX))) GEOS_FAIL();
874  g3 = GEOSPointOnSurface(g1);
876  if (!g3) GEOS_FREE_AND_FAIL(g1);
877  GEOSSetSRID(g3, srid);
879  if (!(result = GEOS2LWGEOM(g3, is3d)))
880  GEOS_FREE_AND_FAIL(g1, g3);
882  GEOS_FREE(g1, g3);
884  return result;
885 }
#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
#define FLAGS_GET_Z(flags)
Macros for manipulating the 'flags' byte.
Definition: liblwgeom.h:140
LWGEOM * lwpoint_as_lwgeom(const LWPOINT *obj)
Definition: lwgeom.c:335
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
LWPOINT * lwpoint_construct_empty(int srid, char hasz, char hasm)
Definition: lwpoint.c:151
int lwgeom_has_m(const LWGEOM *geom)
Return LW_TRUE if geometry has M ordinates.
Definition: lwgeom.c:937
void lwnotice(const char *fmt,...)
Write a notice out to the notice handler.
Definition: lwutil.c:177
uint8_t flags
Definition: liblwgeom.h:400
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_geos_error(), lwgeom_has_m(), lwgeom_is_empty(), lwnotice(), lwpoint_as_lwgeom(), lwpoint_construct_empty(), RESULT_SRID, and SRID_INVALID.

Referenced by pointonsurface().

Here is the call graph for this function:
Here is the caller graph for this function: