ST_MinimumClearance()

Datum ST_MinimumClearance

(

PG_FUNCTION_ARGS

)

Definition at line 3703 of file postgis/lwgeom_geos.c.

References HANDLE_GEOS_ERROR, lwgeom_geos_error(), PG_FUNCTION_INFO_V1(), POSTGIS2GEOS(), POSTGIS_GEOS_VERSION, and ST_MinimumClearanceLine().

Referenced by ST_Voronoi().

{
#if POSTGIS_GEOS_VERSION < 36
        lwpgerror("The GEOS version this PostGIS binary "
                "was compiled against (%d) doesn't support "
                "'ST_MinimumClearance' function (3.6.0+ required)",
                POSTGIS_GEOS_VERSION);
        PG_RETURN_NULL();
#else /* POSTGIS_GEOS_VERSION >= 36 */
        GSERIALIZED* input;
        GEOSGeometry* input_geos;
        int error;
        double result;

        initGEOS(lwpgnotice, lwgeom_geos_error);

        input = PG_GETARG_GSERIALIZED_P(0);
        input_geos = POSTGIS2GEOS(input);
        if (!input_geos)   /* exception thrown at construction */
        {
                HANDLE_GEOS_ERROR("Geometry could not be converted to GEOS");
                PG_RETURN_NULL();
        }

        error = GEOSMinimumClearance(input_geos, &result);
        GEOSGeom_destroy(input_geos);
        if (error)
        {
                HANDLE_GEOS_ERROR("Error computing minimum clearance");
                PG_RETURN_NULL();
        }

        PG_FREE_IF_COPY(input, 0);
        PG_RETURN_FLOAT8(result);
#endif
}

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