topologypreservesimplify()

Datum topologypreservesimplify

(

PG_FUNCTION_ARGS

)

Definition at line 799 of file postgis/lwgeom_geos.c.

References buffer(), GEOS2POSTGIS(), gserialized_get_srid(), gserialized_has_z(), gserialized_is_empty(), HANDLE_GEOS_ERROR, lwgeom_geos_error(), PG_FUNCTION_INFO_V1(), and POSTGIS2GEOS().

Referenced by convexhull().

{
        GSERIALIZED     *geom1;
        double  tolerance;
        GEOSGeometry *g1, *g3;
        GSERIALIZED *result;

        geom1 = PG_GETARG_GSERIALIZED_P(0);
        tolerance = PG_GETARG_FLOAT8(1);

        /* Empty.Simplify() == Empty */
        if ( gserialized_is_empty(geom1) )
                PG_RETURN_POINTER(geom1);

        initGEOS(lwpgnotice, lwgeom_geos_error);

        g1 = (GEOSGeometry *)POSTGIS2GEOS(geom1);
        if ( 0 == g1 )   /* exception thrown at construction */
        {
                HANDLE_GEOS_ERROR("First argument geometry could not be converted to GEOS");
                PG_RETURN_NULL();
        }

        g3 = GEOSTopologyPreserveSimplify(g1,tolerance);
        GEOSGeom_destroy(g1);

        if (g3 == NULL)
        {
                HANDLE_GEOS_ERROR("GEOSTopologyPreserveSimplify");
                PG_RETURN_NULL(); /* never get here */
        }

        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 == NULL)
        {
                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);
}

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