在阅读RFC文档时，发现里面的图片都是字符构成的，觉得很是有趣，这样不仅节省了存储空间、减少网络传输，也能清楚地表达含义。何乐而不为？
于是，就像自己写博客时，也采用这种形式来绘制流程图，于是找到以下工具。
将图片转为字符不是我的目的，所以不考虑。
在线绘制ASCII流程图
如下网站，很简单好用。
http://asciiflow.com/
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
| +------------------+ +-------------------+
| | | |
| | | |
+-----------+ A +----------------> B |
| | | | |
| | | | |
| | | | |
| +------------------+ +-------------------+
|
|
|
| 好 戏 才 开 始
| ^
| |
+-----------------------------+
|
Graph Easy
当我们不能联网时，需要有个本地工具也能绘制，这就要本地安装了，使用Graph-Easy
在ubuntu下安装也很简单：
1
| $ sudo apt install libgraph-easy-perl
|
因为这是一个perl模块，然而我不熟悉perl语言，就不通过编程使用了，只是学会用法就好，具体语法参加文档
命令行使用：
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
| $ echo "[ Bonn ] - car -> [ Berlin ]" | graph-easy
+------+ car +--------+
| Bonn | -----> | Berlin |
+------+ +--------+
$ graph-easy <<< "[a]->[b]->[c] [d]->[e]"
+---+ +---+ +---+
| a | --> | b | --> | c |
+---+ +---+ +---+
+---+ +---+
| d | --> | e |
+---+ +---+
$ graph-easy <<< "[a]->[b]->[c] [d]->[e]->[b]"
+---+ +---+ +---+
| a | --> | b | --> | c |
+---+ +---+ +---+
^
|
|
+---+ +---+
| d | --> | e |
+---+ +---+
$ graph-easy <<< "[a]->[b]->[c] [d]->[e]->[b] [e]->[e]"
+---+ +------+ +---+
| a | --> | b | --> | c |
+---+ +------+ +---+
^
|
|
+---+ +------+
| d | --> | e |
+---+ +------+
^ |
+--+
$ graph-easy <<< "graph{flow:south;}[a]->[b]->[c]"
+---+
| a |
+---+
|
|
v
+---+
| b |
+---+
|
|
v
+---+
| c |
+---+
$ graph-easy <<< "[a]->[b]->[c]->[e] [b]..>[e]"
.....................
: v
+---+ +---+ +---+ +---+
| a | --> | b | --> | c | --> | e |
+---+ +---+ +---+ +---+
|
参考：https://juejin.im/post/5a09c43451882535c56c6bbf