hausdorffdistance()

Datum hausdorffdistance

(

PG_FUNCTION_ARGS

)

Definition at line 173 of file postgis/lwgeom_geos.c.

References gserialized_is_empty(), HANDLE_GEOS_ERROR, hausdorffdistancedensify(), lwgeom_geos_error(), PG_FUNCTION_INFO_V1(), and POSTGIS2GEOS().

Referenced by pip_short_circuit().

{
        GSERIALIZED *geom1;
        GSERIALIZED *geom2;
        GEOSGeometry *g1;
        GEOSGeometry *g2;
        double result;
        int retcode;

        POSTGIS_DEBUG(2, "hausdorff_distance called");

        geom1 = PG_GETARG_GSERIALIZED_P(0);
        geom2 = PG_GETARG_GSERIALIZED_P(1);

        if ( gserialized_is_empty(geom1) || gserialized_is_empty(geom2) )
                PG_RETURN_NULL();

        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();
        }

        g2 = (GEOSGeometry *)POSTGIS2GEOS(geom2);
        if ( 0 == g2 )   /* exception thrown */
        {
                HANDLE_GEOS_ERROR("Second argument geometry could not be converted to GEOS");
                GEOSGeom_destroy(g1);
                PG_RETURN_NULL();
        }

        retcode = GEOSHausdorffDistance(g1, g2, &result);
        GEOSGeom_destroy(g1);
        GEOSGeom_destroy(g2);

        if (retcode == 0)
        {
                HANDLE_GEOS_ERROR("GEOSHausdorffDistance");
                PG_RETURN_NULL(); /*never get here */
        }

        PG_FREE_IF_COPY(geom1, 0);
        PG_FREE_IF_COPY(geom2, 1);

        PG_RETURN_FLOAT8(result);
}

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