PostGIS  3.1.6dev-r@@SVN_REVISION@@

◆ lwgeom_difference_prec()

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

Definition at line 814 of file liblwgeom/lwgeom_geos.c.

815 {
816  LWGEOM* result;
817  int32_t srid = RESULT_SRID(geom1, geom2);
818  uint8_t is3d = (FLAGS_GET_Z(geom1->flags) || FLAGS_GET_Z(geom2->flags));
819  GEOSGeometry *g1, *g2, *g3;
820 
821  if (srid == SRID_INVALID) return NULL;
822 
823  /* A.Intersection(Empty) == Empty */
824  if (lwgeom_is_empty(geom2)) return lwgeom_clone_deep(geom1); /* match empty type? */
825 
826  /* Empty.Intersection(A) == Empty */
827  if (lwgeom_is_empty(geom1)) return lwgeom_clone_deep(geom1); /* match empty type? */
828 
829  initGEOS(lwnotice, lwgeom_geos_error);
830 
831  if (!(g1 = LWGEOM2GEOS(geom1, AUTOFIX))) GEOS_FAIL();
832  if (!(g2 = LWGEOM2GEOS(geom2, AUTOFIX))) GEOS_FREE_AND_FAIL(g1);
833 
834  if ( prec >= 0) {
835 #if POSTGIS_GEOS_VERSION < 39
836  lwerror("Fixed-precision difference requires GEOS-3.9 or higher");
837  GEOS_FREE_AND_FAIL(g1, g2);
838  return NULL;
839 #else
840  g3 = GEOSDifferencePrec(g1, g2, prec);
841 #endif
842  }
843  else
844  {
845  g3 = GEOSDifference(g1, g2);
846  }
847 
848  if (!g3) GEOS_FREE_AND_FAIL(g1, g2);
849  GEOSSetSRID(g3, srid);
850 
851  if (!(result = GEOS2LWGEOM(g3, is3d)))
852  GEOS_FREE_AND_FAIL(g1, g2, g3);
853 
854  GEOS_FREE(g1, g2, g3);
855  return result;
856 }
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_difference(), and ST_Difference().

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