## Saturday, February 26, 2011

### A praise for TikZ

I have been using xfig for ages to draw figures, and I appreciate it, especially combined with a small script I wrote based on an original idea by Seb Desreux at H&K, fig2ps, that allows painless integration of LaTeX code inside xfig figures.

But recently, it seems that I've hit limitations in xfig. Mainly, if it is great when you want to produce sober figures, whenever you want to do something fancier, including shadings and the like, frustration comes in quickly (since it is purely impossible). I've spent a while looking for a decent alternative, until I had a look again at pgf, which since turned into TikZ. That was amazing. It integrates painlessly within LaTeX and is simply great to work with. Drawing complex diagrams with noes and complex relations between them is trivial. It handles moving the nodes very gracefully, and styling can be done in a CSS-like fashion (though it definitely isn't CSS), which means you can first concentrate on structure and then turn your graph into something nice, while for all the other programs I know, you have to handle both structural and stylistic aspects at the same time.

Sure enough, you need to like the command-driven approach, as mice won't come in too useful here... As a side note, I wanted to express my admiration of Till Tantau's (TikZ's author) mastery of (La)TeX: TikZ can be seen as an interpreter of a simple graphical language written in pure TeX, which is, according to my humble experience with dirty trick in TeX, is simply amazing. Many thanks, Till !

## Sunday, February 6, 2011

### Doxygen for Ruby, first working draft !

Quite some time ago, I complained about the lack of support of Ruby in doxygen, the ultimate code documentation generator (at least for me). Time has passed, and I had some time and motivation to look into it and write a patch. The code is now reasonably mature to be used, altough it still lacks many features, and, most importantly, testing.

That's why I pushed my git-svn private repository to github today, in order to get enough testing to integrate it into mainstream doxygen. It's current features:

• Code structure parsing is complete in principle, it should extract all the classes/method definitions. If not, please use the tracker at github, posting a full example showing the problem.
• It features a rdoc compatibility mode (on by default), in which it parses all comments (outside method definitions) and interprets most of rdoc's markup.
• The inner code parsing and cross-linking is very ineffective for now; most cross-links are currently not performed. This is one thing on which I'd like to work some day... Although you're welcome to have a go at it if you wish !

You can get an opinion of how it looks on the code of ctioga2. The doxygen configuration file can be found there.

## Saturday, February 5, 2011

### ctioga superseded by ctioga2

First, some historical details: some 6 years ago, I discovered Ruby together with Tioga, a great library for producing plots. That immediately resulted in my first Ruby program, ctioga. But as years passed and more features were forced into ctioga, I was compelled to see my initial design mistakes, and think about a complete rewrite.

This is where ctioga2 was born, some time at the beginning of 2009. I completely stopped using the old ctioga a few month after starting to work on ctioga2, but it took ages before I finally came up with a decent enough documentation to release and announce publicly. But now, it's done, and the first public release of ctioga2 is out, still fresh !

Here are a few highlights of the differences:

• For me, it's day and night: adding new commands is painless: I only need to create an object with the appropriate code; registering is done automatically.
• Now, command-line switches also accept options looking like this /option value that allow many small tweaks I had never had the courage to write for the old ctioga as it was way too painful to add new commands there.
• ctioga2 can be driven both from command-line and using command files, in the style of gnuplot, which is the reason why I call it polymorphic.
• More importantly, I finally had the possibility (and more or less compelling reasons, to be found in a paper currently in press) to implement 3D data displays in ctioga2, in the form of color maps (that's what is shown here).
• There are still a few things that could be done by ctioga and that miss from ctioga2, such as histograms. When I have some time and/or motivation...

In any case, you can make yourself an opinion of ctioga2 by looking at the galleries.

Enjoy !