Drawing timelapse while presenting

[gitchly]

Since fabric.js stores the canvas data as a series of objects, what if they were loaded slowly during presentation mode, creating a sort of pseudo-timelapse of the drawing process? Quickly moving through the undo/redo stacks after you've done a drawing makes the canvas do that sort of effect.

[gitchly]

This would just require transmitting the json data over the network instead of the canvas image. It'll need to be handled carefully to ensure no poisoning/abuse of this though. I'm not sure how secure fabric.js is with drawing json objects.

An example of a possible vulnerability: If someone were to manipulate the json to have a hyperlinked image, and fabric.js downloads or renders it automatically, the malicious user could get the IP addresses of other players who fetch the image.

[gitchly]

Using json objects for the canvas data is similar to #13