topologypreservesimplify()

Datum topologypreservesimplify

(

PG_FUNCTION_ARGS

)

Definition at line 751 of file postgis/lwgeom_geos.c.

{
        GSERIALIZED     *geom1;
        double  tolerance;
        GEOSGeometry *g1, *g3;
        GSERIALIZED *result;
        uint32_t type;
 
        geom1 = PG_GETARG_GSERIALIZED_P(0);
        tolerance = PG_GETARG_FLOAT8(1);
 
        /* Empty.Simplify() == Empty */
        type = gserialized_get_type(geom1);
        if ( gserialized_is_empty(geom1) || type == TINTYPE || type == TRIANGLETYPE )
                PG_RETURN_POINTER(geom1);
 
        initGEOS(lwpgnotice, lwgeom_geos_error);
 
        g1 = POSTGIS2GEOS(geom1);
        if (!g1)
                HANDLE_GEOS_ERROR("First argument geometry could not be converted to GEOS");
 
        g3 = GEOSTopologyPreserveSimplify(g1,tolerance);
        GEOSGeom_destroy(g1);
 
        if (!g3) HANDLE_GEOS_ERROR("GEOSTopologyPreserveSimplify");
 
        POSTGIS_DEBUGF(3, "result: %s", GEOSGeomToWKT(g3));
 
        GEOSSetSRID(g3, gserialized_get_srid(geom1));
 
        result = GEOS2POSTGIS(g3, gserialized_has_z(geom1));
        GEOSGeom_destroy(g3);
 
        if (!result)
        {
                elog(ERROR,"GEOS topologypreservesimplify() threw an error (result postgis geometry formation)!");
                PG_RETURN_NULL(); /* never get here */
        }
 
        PG_FREE_IF_COPY(geom1, 0);
        PG_RETURN_POINTER(result);
}

References GEOS2POSTGIS(), gserialized_get_srid(), gserialized_get_type(), gserialized_has_z(), gserialized_is_empty(), HANDLE_GEOS_ERROR, lwgeom_geos_error(), POSTGIS2GEOS(), TINTYPE, TRIANGLETYPE, and ovdump::type.

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