A few years ago I was very proud of myself for managing to translate the original Pascal of the Reingold-Tilford algorithm into C/C++ and every since then I have had a fascination for drawing binary trees.
The one drawn here was actually done “by hand” in Metapost – I realised only as I finished it that I could have or maybe should used an algorithmic approach and not a heuristic (“does it look ok?”), though Metapost is a pretty inflexible programming tool (though as this book shows can produce some beautiful results) and I reckon a decent tree drawing algorithm in that ought to be worth at least an MSc.
cartesian product ... stuff about computing mostly 