ProtoVis has a somewhat modular rendering backend, I believe. So you could probably rewrite it to run on canvas. That said, why do you think SVG is languishin

ProtoVis has a somewhat modular rendering backend, I believe. So you could probably rewrite it to run on canvas. That said, why do you think SVG is languishing? The IE9 demos made quite a big deal of their SVG support and the other major browsers already have pretty decent support for it.