LWGEOM_asEncodedPolyline()

Datum LWGEOM_asEncodedPolyline

(

PG_FUNCTION_ARGS

)

Definition at line 660 of file lwgeom_export.c.

{
        GSERIALIZED *geom;
        LWGEOM *lwgeom;
        char *encodedpolyline;
        int precision = 5;
        text *result;
 
        if ( PG_ARGISNULL(0) ) PG_RETURN_NULL();
 
        geom = PG_GETARG_GSERIALIZED_P(0);
        if (gserialized_get_srid(geom) != 4326) {
                PG_FREE_IF_COPY(geom, 0);
                elog(ERROR, "Only SRID 4326 is supported.");
                PG_RETURN_NULL();
        }
        lwgeom = lwgeom_from_gserialized(geom);
 
        if (PG_NARGS() > 1 && !PG_ARGISNULL(1))
        {
                precision = PG_GETARG_INT32(1);
                if ( precision < 0 ) precision = 5;
        }
 
        encodedpolyline = lwgeom_to_encoded_polyline(lwgeom, precision);
        lwgeom_free(lwgeom);
        PG_FREE_IF_COPY(geom, 0);
 
        result = cstring_to_text(encodedpolyline);
        lwfree(encodedpolyline);
 
        PG_RETURN_TEXT_P(result);
}

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

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