Aafigure (https://launchpad.net/aafigure) is an application for ASCII line art to image conversion. Using the AsciiDoc aafigure filter, ASCII line art can be embedded into AsciiDoc documents and processed into either PNG bitmap or SVG vector graphics.
For example this ASCII text:
+---------+ +---------+ +---------+
| Shape | | Line | | Point |
+---------+ +---------+ 2 +---------+
| draw +<--------+ start +----O+ x |
| move +<-+ | end | | y |
+---------+ \ +---------+ +---------+
\
\ +---------+
+--+ Circle |
+---------+
| center |
| radius |
+---------+
renders:
More information and examples can be found on the README page.