Computational geometry question for my readers

Especially for 11011110 and complexzeta.

Suppose I have some planar tree. I can rely on the tree being stored in a custom datatype, something like the Haskell

data Tree = Leaf | Node [Tree]

I wish to produce a picture of the tree, drawn with root downwards, and all the branches pointing upwards (as in ending with a higher y-coordinate than they started). I would prefer to end up with xypic code for inclusion in LaTeX documents, but this is not necessarily a must.

Is there already libraries available to do this? And if not libraries, are there known methods for doing this? Where should I look?

InaDWriMo week summary

Either this week went surprisingly well, or I set my goals way too low. I'm closing in on the point where I have more topics covered than not - and I'm well past 50% of the pages. For the remaining text, there are a few bits where I still need the proper references around; one paper I still try to understand completely, and a few bits to fill in from one of my papers.

Once all that's done comes the big job of taking the mass of text and massage it into something that's actually both consistently written and a pleasure to read, instead of the massive text chunks it currently is.

But I should probably be quite pleased with my progress.