PostGIS  2.3.7dev-r@@SVN_REVISION@@
Datum LWGEOM_asEncodedPolyline ( PG_FUNCTION_ARGS  )

Definition at line 621 of file lwgeom_export.c.

References dumpnode::geom, gserialized_get_srid(), lwfree(), lwgeom_free(), lwgeom_from_gserialized(), lwgeom_to_encoded_polyline(), and precision.

622 {
623  GSERIALIZED *geom;
624  LWGEOM *lwgeom;
625  char *encodedpolyline;
626  int precision = 5;
627  text *result;
628 
629  if ( PG_ARGISNULL(0) ) PG_RETURN_NULL();
630 
631  geom = PG_GETARG_GSERIALIZED_P(0);
632  if (gserialized_get_srid(geom) != 4326) {
633  PG_FREE_IF_COPY(geom, 0);
634  elog(ERROR, "Only SRID 4326 is supported.");
635  PG_RETURN_NULL();
636  }
637  lwgeom = lwgeom_from_gserialized(geom);
638 
639  if (PG_NARGS() > 1 && !PG_ARGISNULL(1))
640  {
641  precision = PG_GETARG_INT32(1);
642  if ( precision < 0 ) precision = 5;
643  }
644 
645  encodedpolyline = lwgeom_to_encoded_polyline(lwgeom, precision);
646  lwgeom_free(lwgeom);
647  PG_FREE_IF_COPY(geom, 0);
648 
649  result = cstring2text(encodedpolyline);
650  lwfree(encodedpolyline);
651 
652  PG_RETURN_TEXT_P(result);
653 }
void lwfree(void *mem)
Definition: lwutil.c:242
LWGEOM * lwgeom_from_gserialized(const GSERIALIZED *g)
Allocate a new LWGEOM from a GSERIALIZED.
void lwgeom_free(LWGEOM *geom)
Definition: lwgeom.c:1063
char * lwgeom_to_encoded_polyline(const LWGEOM *geom, int precision)
LWGEOM * geom
uint8_t precision
Definition: cu_in_twkb.c:25
int32_t gserialized_get_srid(const GSERIALIZED *s)
Extract the SRID from the serialized form (it is packed into three bytes so this is a handy function)...
Definition: g_serialized.c:83

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