下面是使用Emacs的artist-mode绘制出的ASCII格式图形。看了这个图形之后，我想你肯定会说：“简直就是shit！”。
:-)
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+---------------------------------------------------------+
| Applications |
| +----------------------------------------------------+
| | System Libraries |
+----+----------------------------------------------------+
| System Call Interface |
+------------------------+--------------+-----------------+ +---------+
| VFS | Socket | | | |
+------------------------+--------------+ Scheduler +-------+ CPU |
| File Systems | TCP/UDP | | | |
+------------------------+--------------+-----------------+ +----+----+
| Volume Manager | IP | Virtual | |
+------------------------+--------------+ Memory | |
| Block Device Interface | Ethernet | | |
+------------------------+--------------+-----------------+ +----+----+
| Device Driver | | DRAM |
+-----------------------------+---------------------------+ +---------+
|
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+-------+--------+
| I/O Bridge |
+-------+--------+
|
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------+-----------------+--------------------+------
| |
+---------+--------+ +----------+---------+
| I/O Controller | | Network Controller |
+-+-------+------+-+ +----+----------+----+
| | | | |
+---+---+ | +---+---+ +----+----+ +---+----+
| Disk | ... | Swap | | Port | | Port |
+-------+ +-------+ +---------+ +--------+
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上面的ASCII图形只是开始，下面结合ditaa工具，快速地做出相应的图片。ditaa工具是Stathis Sideris使用Java开发的一款工具，全称是（DIagrams Through Ascii）。
下面的图象是在Emacs的Org-mode下绘制出来的，具体代码为：
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#+BEGIN_SRC ditaa :file images/linux-os.png
+---------------------------------------------------------+
| Applications |
| +----------------------------------------------------+
| | System Libraries |
+----+----------------------------------------------------+
| System Call Interface |
+------------------------+--------------+-----------------+ +---------+
| VFS | Socket | | | |
+------------------------+--------------+ Scheduler +-------+ CPU |
| File Systems | TCP
/UDP
| | | |
+------------------------+--------------+-----------------+ +----+----+
| Volume Manager | IP | Virtual | |
+------------------------+--------------+ Memory | |
| Block Device Interface | Ethernet | | |
+------------------------+--------------+-----------------+ +----+----+
| Device Driver | | DRAM |
+-----------------------------+---------------------------+ +---------+
|
|
+-------+--------+
| I
/O
Bridge |
+-------+--------+
|
|
------+-----------------+--------------------+------
| |
+---------+--------+ +----------+---------+
| I
/O
Controller | | Network Controller |
+-+-------+------+-+ +----+----------+----+
| | | | |
+---+---+ | +---+---+ +----+----+ +---+----+
| Disk | ... | Swap | | Port | | Port |
+-------+ +-------+ +---------+ +--------+
#+END_SRC
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在BEGIN_SRC与END_SRC之间的任何位置，按组合键“C-c C-c”即可完成编译，输出的结果为：
还可以添加一些命令行选项：如
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ditaa :
file
images
/linux-os
.png :cmdline -E
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得到的结果如下：
怎么样？是不是有些zhuangbility！
:-)
本文转自 bigstone2012 51CTO博客，原文链接:http://blog.51cto.com/lavenliu/1597369
