traveler The #! line identifies the system as Windows.

I hacked together a test on MacOSX/XDarwin. Even with a angle down to 0.04, I still had a few pixels I could identify as being part of that segment (although nowhere near the full width of the band). I'd suspect limitations on your platform.

I note that you have an ordering defined for your data (in the select statement), but you then stuff the data into a hash instead of an array. You then pull the keys out of the hash, losing your ordering. The arcs are in no particular order. I bet you didn't want that.

Far simpler would be to push the data into an array.

I've not dug into the details of why the mouse-over message doesn't work; you need to do your bind differently.

I think you do have the basic idea there, but it has rough edges and some really pointy bits that ought not be pointy.

yours,
Michael