绘图神器 —— Graphviz dot 语言介绍

（1）文字的属性：fontcolor，fontsize，

（2）可选的形状有：box, polygon, ellipse, oval, circle, point, egg, triangle, plaintext, diamond, trapezium, parallelogram, house, pentagon, hexagon, septagon, octagon, doublecircle, doubleoctagon, tripleoctagon

箭头的方向

digraph Arrow{
A -> B [dir = both];
B -> C [dir = none];
C -> D [dir = back];
D -> A [dir = forward];
/* forward 也是默认的方向*/
}

布局

graph graphname {
a -- b;
b -- c;
b -- d;
d -- a;
}

一样的图，不一样的布局：

graph graphname {
rankdir = LR;     // Rank direction from left to right
a -- b;
b -- c;
b -- d;
d -- a;
}

标签

digraph graphname {
T [label = "Teacher"];
P [label = "Pupil"];
T -> P [label = "Instructions", fontcolor=darkgreen];
}

节省时间的技巧

单独定义每一个节点是十分浪费时间的，下面给出一种统一设置的方式：

digraph graphname {
nodesep = 1.0
node [shape = box, color = red, fontname = Courier]
edge [color = blue, shape = dashed]

Headteacher -> {Deputy1, Deputy2, BusinessManager}
Deputy1 -> {Teacher1, Teacher2}
BusinessManager -> ITManager
{rank = same; Teacher1, Teacher2, ITManager}
}