PostGIS  2.2.7dev-r@@SVN_REVISION@@
Datum LWGEOM_dwithin ( PG_FUNCTION_ARGS  )

Definition at line 713 of file lwgeom_functions_basic.c.

References error_if_srid_mismatch(), lwgeom_from_gserialized(), lwgeom_mindistance2d_tolerance(), and LWGEOM::srid.

714 {
715  double mindist;
716  GSERIALIZED *geom1 = PG_GETARG_GSERIALIZED_P(0);
717  GSERIALIZED *geom2 = PG_GETARG_GSERIALIZED_P(1);
718  double tolerance = PG_GETARG_FLOAT8(2);
719  LWGEOM *lwgeom1 = lwgeom_from_gserialized(geom1);
720  LWGEOM *lwgeom2 = lwgeom_from_gserialized(geom2);
721 
722  if ( tolerance < 0 )
723  {
724  elog(ERROR,"Tolerance cannot be less than zero\n");
725  PG_RETURN_NULL();
726  }
727 
728  error_if_srid_mismatch(lwgeom1->srid, lwgeom2->srid);
729 
730  mindist = lwgeom_mindistance2d_tolerance(lwgeom1,lwgeom2,tolerance);
731 
732  PG_FREE_IF_COPY(geom1, 0);
733  PG_FREE_IF_COPY(geom2, 1);
734  /*empty geometries cases should be right handled since return from underlying
735  functions should be FLT_MAX which causes false as answer*/
736  PG_RETURN_BOOL(tolerance >= mindist);
737 }
LWGEOM * lwgeom_from_gserialized(const GSERIALIZED *g)
Allocate a new LWGEOM from a GSERIALIZED.
double lwgeom_mindistance2d_tolerance(const LWGEOM *lw1, const LWGEOM *lw2, double tolerance)
Function handling min distance calculations and dwithin calculations.
Definition: measures.c:199
void error_if_srid_mismatch(int srid1, int srid2)
Definition: lwutil.c:341
int32_t srid
Definition: liblwgeom.h:383

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