Ditaa Code Blocks in Org

Ditaa is a command-line utility that converts diagrams drawn using ASCII art into bitmap graphics.

Ditaa is no longer distributed with Org. Now, you will need to install ditaa and store the path to the executable in the variable ob-ditaa-jar-path. Often, this is all that is needed to set up ditaa in Babel. Nevertheless, Org offers several other variables designed to accommodate non-standard Java setups. These include org-babel-ditaa-java-cmd, org-ditaa-eps-jar-path, and org-ditaa-jar-option.

Activate evaluation of ditaa source code blocks by adding ditaa to org-babel-load-languages.

(org-babel-do-load-languages
 'org-babel-load-languages
 '((ditaa . t))) ; this line activates ditaa

The obligatory Hello World! example in ditaa:

#+BEGIN_SRC ditaa :file images/hello-world.png
+--------------+
|              |
| Hello World! |
|              |
+--------------+
#+END_SRC

Now, round all corners by passing ditaa the -r,--round-corners command line switch.

#+BEGIN_SRC ditaa :file images/hello-world-round.png :cmdline -r
+--------------+
|              |
| Hello World! |
|              |
+--------------+
#+END_SRC