"crowding of offspring"... so don't think of it as a static graphic. Think of it as a miniature website of its own. It takes not too much effort to make a flat graphic into an image map. Put a set of destinations and 'tooltips' on each needed link. Viewer hovers over something, say a given union. All but the focal offspring of that union are hidden on the chart, and show up listed in the tooltip. Click there, and you get a new, derivative graphic, which *does* show that generation of that branch in full, relegating the others to single-line obscurity. <engineer waves hand airily> "that's the idea, carrying it out is mere turning the crank."
Slick map, btw - I like it.
It's intended as a print piece to accompany my writers group's next anthology (as is the Woadsbury map! still under revision), so mouseovers etc. are no-go. Otherwise, I'd probably be doing it in Flash.
I think I've solved the "crowding of offspring" problem. I don't have a screenshot handy to post yet, though.
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