LWGEOM_FilterByM()

Datum LWGEOM_FilterByM

(

PG_FUNCTION_ARGS

)

Definition at line 3095 of file lwgeom_functions_basic.c.

{
        GSERIALIZED *geom_in;
        GSERIALIZED *geom_out;
        LWGEOM *lwgeom_in;
        LWGEOM *lwgeom_out;
        double min, max;
        int returnm;
        int hasm;
 
        if ( PG_NARGS() > 0 && ! PG_ARGISNULL(0))
        {
                geom_in = PG_GETARG_GSERIALIZED_P(0);
        }
        else
        {
                PG_RETURN_NULL();
        }
 
        if ( PG_NARGS() > 1 && ! PG_ARGISNULL(1))
                min = PG_GETARG_FLOAT8(1);
        else
        {
                min = DBL_MIN;
        }
        if ( PG_NARGS() > 2  && ! PG_ARGISNULL(2))
                max = PG_GETARG_FLOAT8(2);
        else
        {
                max = DBL_MAX;
        }
        if ( PG_NARGS() > 3  && ! PG_ARGISNULL(3) && PG_GETARG_BOOL(3))
                returnm = 1;
        else
        {
                returnm=0;
        }
 
        if(min>max)
        {
                elog(ERROR,"Min-value cannot be larger than Max value\n");
                PG_RETURN_NULL();
        }
 
        lwgeom_in = lwgeom_from_gserialized(geom_in);
 
        hasm = FLAGS_GET_M(lwgeom_in->flags);
 
        if(!hasm)
        {
                elog(NOTICE,"No M-value, No vertex removed\n");
                PG_RETURN_POINTER(geom_in);
        }
 
        lwgeom_out = lwgeom_filter_m(lwgeom_in, min, max,returnm);
 
        geom_out = geometry_serialize(lwgeom_out);
        lwgeom_free(lwgeom_out);
        PG_RETURN_POINTER(geom_out);
 
}

References LWGEOM::flags, FLAGS_GET_M, geometry_serialize(), lwgeom_filter_m(), lwgeom_free(), and lwgeom_from_gserialized().

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