（二）Graphivz 简单结构图及子图

digraph structs {
node [shape=record];
struct1 [shape=record,label="<f0> left|<f1> mid\ dle|<f2> right"];
//record图形，三个属性f0,f1,f2
struct2 [shape=record,label="<f0> one|<f1> two"];
struct3 [shape=record,label="hello\nworld |{ b |{c|<here> d|e}| f}| g | h"];
struct1 -> struct2:f1;
//指向struct2 的f1属性
struct1 -> struct3;
}

digraph g {
subgraph cluster0 {
//我是一个子图，subgraph定义了我，
node[style = filled, color = white];
//我之内的节点都是这种样式
style = filled;
//我的样式是填充
color = lightgrey;
//我的颜色
a0->a1->a2->a3;
label = "prcess #1"
//我的标题
}
subgraph cluster1 {
//我也是一个子图
node[style = filled];
b0->b1->b2->b3;
label = "process #2";
color = blue;
}

}