====== dot practice ======
[[http://www.graphviz.org/pdf/dotguide.pdf|dot guide (pdf)]]
test.dot
<code bash>
  digraph G {
    node1;
    node2;
    node3;

    node1 -> node2 [label="edge_1_2"];
    node1 -> node3 [label="edge_1_3"];
    node2 -> node3 [label="edge_2_3"];
  }
</code>
<code bash>
digraph G {
subgraph cluster0 {
node [style=filled,color=white];
style=filled;
color=lightgrey;
a0 -> a1 -> a2 -> a3;
label = "process #1";
}
subgraph cluster1 {
node [style=filled];
b0 -> b1 -> b2 -> b3;
label = "process #2";
color=blue
}
start -> a0;
start -> b0;
a1 -> b3;
b2 -> a3;
a3 -> a0;
a3 -> end;
b3 -> end;
start [shape=Mdiamond];
end [shape=Msquare];
}
</code>
test.png 만들기
<code>
$ dot -Tpng test.dot -o test.jpg
</code>

====== reference ======
  *[[http://www.ibm.com/developerworks/kr/library/l-graphvis/index.html|Graphviz를 이용하여 함수 호출을 그림으로 나타내기 (한글)]]