LWGEOM_locate_between_m()

Datum LWGEOM_locate_between_m

(

PG_FUNCTION_ARGS

)

Definition at line 702 of file lwgeom_functions_lrs.c.

{
        GSERIALIZED *gin = PG_GETARG_GSERIALIZED_P(0);
        GSERIALIZED *gout;
        double start_measure = PG_GETARG_FLOAT8(1);
        double end_measure = PG_GETARG_FLOAT8(2);
        LWGEOM *lwin, *lwout;
        int hasz = gserialized_has_z(gin);
        int hasm = gserialized_has_m(gin);
        int type;
 
        elog(WARNING,"ST_Locate_Between_Measures and ST_Locate_Along_Measure were deprecated in 2.2.0. Please use ST_LocateAlong and ST_LocateBetween");
 
        if ( end_measure < start_measure )
        {
                lwpgerror("locate_between_m: 2nd arg must be bigger then 1st arg");
                PG_RETURN_NULL();
        }
 
        /*
         * Return error if input doesn't have a measure
         */
        if ( ! hasm )
        {
                lwpgerror("Geometry argument does not have an 'M' ordinate");
                PG_RETURN_NULL();
        }
 
        /*
         * Raise an error if input is a polygon, a multipolygon
         * or a collection
         */
        type = gserialized_get_type(gin);
 
        if ( type == POLYGONTYPE || type == MULTIPOLYGONTYPE || type == COLLECTIONTYPE )
        {
                lwpgerror("Areal or Collection types are not supported");
                PG_RETURN_NULL();
        }
 
        lwin = lwgeom_from_gserialized(gin);
 
        lwout = lwgeom_locate_between_m(lwin,
                                        start_measure, end_measure);
 
        lwgeom_free(lwin);
 
        if ( lwout == NULL )
        {
                lwout = (LWGEOM *)lwcollection_construct_empty(COLLECTIONTYPE,
                            gserialized_get_srid(gin), hasz, hasm);
        }
 
        gout = geometry_serialize(lwout);
        lwgeom_free(lwout);
 
        PG_RETURN_POINTER(gout);
}

References COLLECTIONTYPE, geometry_serialize(), gserialized_get_srid(), gserialized_get_type(), gserialized_has_m(), gserialized_has_z(), lwcollection_construct_empty(), lwgeom_free(), lwgeom_from_gserialized(), lwgeom_locate_between_m(), MULTIPOLYGONTYPE, and POLYGONTYPE.

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