PostGIS  2.5.7dev-r@@SVN_REVISION@@

◆ lwgeom_clip_by_rect()

LWGEOM* lwgeom_clip_by_rect ( const LWGEOM geom1,
double  x1,
double  y1,
double  x2,
double  y2 
)

Definition at line 921 of file liblwgeom/lwgeom_geos.c.

922 {
923  LWGEOM *result;
924  GEOSGeometry *g1, *g3;
925  int is3d;
926 
927  /* A.Intersection(Empty) == Empty */
928  if ( lwgeom_is_empty(geom1) )
929  return lwgeom_clone_deep(geom1);
930 
931  is3d = FLAGS_GET_Z(geom1->flags);
932 
933  initGEOS(lwnotice, lwgeom_geos_error);
934 
935  if (!(g1 = LWGEOM2GEOS(geom1, AUTOFIX)))
936  GEOS_FAIL_DEBUG();
937 
938  if (!(g3 = GEOSClipByRect(g1, x1, y1, x2, y2)))
940 
941  GEOS_FREE(g1);
942  result = GEOS2LWGEOM(g3, is3d);
943  GEOS_FREE(g3);
944 
945  if (!result)
946  GEOS_FAIL_DEBUG();
947 
948  result->srid = geom1->srid;
949 
950  return result;
951 }
#define GEOS_FREE(...)
#define AUTOFIX
#define GEOS_FREE_AND_FAIL_DEBUG(...)
#define GEOS_FAIL_DEBUG()
GEOSGeometry * LWGEOM2GEOS(const LWGEOM *lwgeom, uint8_t autofix)
LWGEOM * GEOS2LWGEOM(const GEOSGeometry *geom, uint8_t want3d)
void lwgeom_geos_error(const char *fmt,...)
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
uint8_t flags
Definition: liblwgeom.h:400
int32_t srid
Definition: liblwgeom.h:402

References AUTOFIX, LWGEOM::flags, FLAGS_GET_Z, GEOS2LWGEOM(), GEOS_FAIL_DEBUG, GEOS_FREE, GEOS_FREE_AND_FAIL_DEBUG, LWGEOM2GEOS(), lwgeom_clone_deep(), lwgeom_geos_error(), lwgeom_is_empty(), lwnotice(), and LWGEOM::srid.

Referenced by mvt_unsafe_clip_by_box(), ST_ClipByBox2d(), and test_lwgeom_clip_by_rect().

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