raphaelGWT vs raphaeljs : Which one could be the appropriate candidate for a charting library

Hi,

first of all thanks for the gwt-wrapper around Raphael. I ll be
working on a charting library soon (with Raphael or Raphael-gwt) so I
got one question, How I could extend it. I mean like in JavaScript?
we ll do like Raphael.g.barchart=function(..){...} or you could
suggest any other appropriate method extend it to make a charting
library.

And one more question, my senior wants to make charting
library(widgets) on Raphael-gwt and I believe that making it in
JavaScript than wrapping it up would be more convenient, so whats your
opinion.

So what could be best choice for a nice and complex charting library
for gwt : raphaelJS (JavaScript) or
raphaelgwt.

And if you think it is raphaeljs (making wrapper using JSNI) please
give me some points to convince my senior.

Thanks in advance.

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