lwgeom_linemerge_directed()

LWGEOM* lwgeom_linemerge_directed	(	const LWGEOM *	geom,
		int	directed
	)

Definition at line 757 of file liblwgeom/lwgeom_geos.c.

{
        LWGEOM* result;
        int32_t srid = RESULT_SRID(geom);
        uint8_t is3d = FLAGS_GET_Z(geom->flags);
        GEOSGeometry* g1;
        GEOSGeometry* g3;
 
        if (srid == SRID_INVALID) return NULL;
 
        /* Empty.Linemerge() == Empty */
        if (lwgeom_is_empty(geom)) return lwgeom_clone_deep(geom); /* match empty type to linestring? */
 
        initGEOS(lwnotice, lwgeom_geos_error);
 
        if (!(g1 = LWGEOM2GEOS(geom, AUTOFIX))) GEOS_FAIL();
 
        if (directed)
        {
#if POSTGIS_GEOS_VERSION < 31100
                lwerror("Directed line merging requires GEOS-3.11 or higher");
                GEOS_FREE_AND_FAIL(g1);
                return NULL;
#else
                g3 = GEOSLineMergeDirected(g1);
#endif
        }
        else
        {
                g3 = GEOSLineMerge(g1);
        }
 
        if (!g3) GEOS_FREE_AND_FAIL(g1);
        GEOSSetSRID(g3, srid);
 
        if (!(result = GEOS2LWGEOM(g3, is3d)))
                GEOS_FREE_AND_FAIL(g1, g3);
 
        GEOS_FREE(g1, g3);
 
        return result;
}

References AUTOFIX, LWGEOM::flags, FLAGS_GET_Z, GEOS2LWGEOM(), GEOS_FAIL, GEOS_FREE, GEOS_FREE_AND_FAIL, lwerror(), LWGEOM2GEOS(), lwgeom_clone_deep(), lwgeom_geos_error(), lwgeom_is_empty(), lwnotice(), result, RESULT_SRID, and SRID_INVALID.

Referenced by linemerge(), and lwgeom_linemerge().

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