Code

void ArrangeLinks()
{
	foreach (var link in diagram.Links)
	{
		if (link.OriginAnchor != -1 &&
			link.DestinationAnchor != -1)
		{
			link.Route();
			continue;
		}
		var end = link.EndPoint;
		var start = end;
		start.X = link.Origin.Bounds.Right;
		SetLinkPoints(link, start, end);

		var intersectedNode = IntersectedNode(link);
		if (intersectedNode == null)
			continue;
		var bend1 = end;
		var bend2 = end;
		var r = intersectedNode.Bounds;
		bend1.X = bend2.X = (end.X + r.Right) / 2;
		if (start.Y < intersectedNode.GetCenter().Y)
			bend1.Y = r.Top - 10;
		else
			bend1.Y = r.Bottom + 10;
		start.Y = bend1.Y;
		SetLinkPoints(link, start, bend1, bend2, end);
	}
}

private void SetLinkPoints(DiagramLink link, params Point[] points)
{
	link.AutoRoute = false;
	link.SegmentCount = (short)(points.Length - 1);
	link.Shape = LinkShape.Polyline;
	link.ControlPoints.Clear();
	link.ControlPoints.AddRange(points);
	link.UpdateFromPoints();
}

DiagramNode IntersectedNode(DiagramLink link)
{
	foreach (var node in diagram.Nodes)
	{
		if (node == link.Origin ||
			node == link.Destination ||
			node is ContainerNode)
			continue;
		if (link.Intersects(node))
			return node;
	}
	return null;
}