I need to learn about graphics in javascript. Can someone recommend good tutorial material?
In particular I'd like to mix graphics and formatted text in layers, if that helps.
Update: Eugene asks a good question, but the answer is really "yes." I don't know much about graphics in js from any point of view. I'm particularly unclear on the decision among raw graphics formats.
My immediate need is that I'm building a Ruby on Rails app with heavy 2D line art that's generated on the fly; I'd like to pass JSON to a client-side app that draws the results. But I also want to learn the topic thoroughly, not just hack a particular library.