1

digraph G {

     2

    compound=true;

     3

    rankdir=LR;

     4

     5

    gs [label="Game State"];    

     6

    client [label="Client"];

     7

    server [label="Server"];

     8

    physics [label="Physics"];

     9

    graphics [label="Graphics"];

    10

//    internet [label="Teh Internets", shape=polygon];    

    11

    12

    subgraph cluster0 {

    13

        label = "Network";

    14

	{rank=source; client; server;}

    15

	client;

    16

	server;	

    17

	color = black;

    18

    }

    19

    20

    subgraph cluster1 {

    21

        label = "Game Engine";

    23

	gs;

    24

	physics;

    25

	color = black;

    26

    }

    27

    28

    {rank=sink; input; graphics;}

    29

 //   client->server [dir=both];

    30

    client->server;

    31

    server->client;

    32

    33

    gs->physics;	

    34

    physics->graphics [ltail=cluster1];  

    35

    input->gs [lhead=cluster1];    

    36

//   client->internet [ltail=cluster0];

    37

//   internet->server [lhead=cluster0];

    38

    39

    gs->server [lhead=cluster0,dir=both];

    40

}