ST_MinimumClearanceLine()

Datum ST_MinimumClearanceLine

(

PG_FUNCTION_ARGS

)

Definition at line 3749 of file postgis/lwgeom_geos.c.

References GEOS2POSTGIS(), gserialized_get_srid(), HANDLE_GEOS_ERROR, LW_FALSE, lwgeom_geos_error(), POSTGIS2GEOS(), and POSTGIS_GEOS_VERSION.

Referenced by ST_MinimumClearance().

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

        initGEOS(lwpgnotice, lwgeom_geos_error);

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

        result_geos = GEOSMinimumClearanceLine(input_geos);
        GEOSGeom_destroy(input_geos);
        if (!result_geos)
        {
                HANDLE_GEOS_ERROR("Error computing minimum clearance");
                PG_RETURN_NULL();
        }

        GEOSSetSRID(result_geos, srid);
        result = GEOS2POSTGIS(result_geos, LW_FALSE);
        GEOSGeom_destroy(result_geos);

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

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