Given data per second, how can I make a seamless web chart of some rolling period of time?

So lets say I have 24 hours of data split into 1 hour chunks, and the data is per second sequentially. I want to graph a rolling hour at a time, such that every second for the user, the graph will update to reflect an hour of data. I want this to look as seamless as possible.

I guess there are two questions here: one is how do you do the physical drawing of the data? The second is: how can you progressively load files? I assume that you would load hour 1 and hour 2 at first, chart hour 1, then sort of "queue" the seconds in hour 2 and take an element and draw it every second. At some point you have to load the next hour of data and continue the process...not really 开发者_高级运维sure how to do this in a web context.

I appreciate the help!