LWGEOM_dwithin()

Datum LWGEOM_dwithin

(

PG_FUNCTION_ARGS

)

Definition at line 731 of file lwgeom_functions_basic.c.

{
        double mindist;
        GSERIALIZED *geom1 = PG_GETARG_GSERIALIZED_P(0);
        GSERIALIZED *geom2 = PG_GETARG_GSERIALIZED_P(1);
        double tolerance = PG_GETARG_FLOAT8(2);
        LWGEOM *lwgeom1 = lwgeom_from_gserialized(geom1);
        LWGEOM *lwgeom2 = lwgeom_from_gserialized(geom2);
 
        if (tolerance < 0)
        {
                elog(ERROR, "Tolerance cannot be less than zero\n");
                PG_RETURN_NULL();
        }
 
        gserialized_error_if_srid_mismatch(geom1, geom2, __func__);
 
        if (lwgeom_is_empty(lwgeom1) || lwgeom_is_empty(lwgeom2))
        {
                PG_RETURN_BOOL(false);
        }
 
        mindist = lwgeom_mindistance2d_tolerance(lwgeom1, lwgeom2, tolerance);
 
        PG_FREE_IF_COPY(geom1, 0);
        PG_FREE_IF_COPY(geom2, 1);
        /*empty geometries cases should be right handled since return from underlying
         functions should be FLT_MAX which causes false as answer*/
        PG_RETURN_BOOL(tolerance >= mindist);
}

References gserialized_error_if_srid_mismatch(), lwgeom_from_gserialized(), lwgeom_is_empty(), and lwgeom_mindistance2d_tolerance().

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