by Ankit Agarwal.
I haven't looked in detail all the possible charts that are supported by yui3. I just wanted to get it out there for consideration as well basically because:-
# Chart generation will be done on client side
# Long upstream support assured
# Yui3 libraries are already in place in moodle.
There are some dual axis support as well, but havent played with it much http://yuilibrary.com/yui/docs/charts/charts-dualaxes.html
From memory there is some series support as well but afaik they might not support such complex radar chart types etc.