One thing to note about the documentation - it provides API
documentation and some general documentation on marks, but to really
get to grips with it people tend to use the examples. In fact, I would
guess people rely on taking an example and adapting them to their
needs quite a bit.
Obviously this won't work for everyone, or every situation - and
tutorials on protovis would definitely add to the offering. Writing a
good book on this sort of topic is time intensive (I've toyed with the
idea myself).
Tutorials such as the one Jan references are great, and it's hopefully
only a matter of time before the protovis ecosystem gets large enough
to have enough bloggers that such tutorials become more prolific and
easier to find.
I'm not sure where you picked the example code from - but ticks and
tickFormat are defined here:
http://vis.stanford.edu/protovis/jsdoc/symbols/pv.Scale.quantitative.html
Javascript allows some fairly fancy inheritance methods, and the what
the documentation is laid out doesn't abstract that much (it's
basically a leaky abstraction - it's kinda OO, but isn't).
What don't you understand about the documentation? I'd be happy to help.
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Jamie Love
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