Scale transitions

[hadley]

It would be useful if scales supported transitions so that they updated when smoothly when the underlying data changed. Transitions could either accumulate all values in the domain (i.e. so they'd grow but never shrink), or gracefully forget older values so the scales gradually focussed only on the currently displayed data.

It would also be useful to have an exposed API method to modify scale domains to (e.g.) implement pan and zoom.

[kjavia]

Yeah this is a great feature to have. Right now zooming in an out of the X-Axis values (say from week to month to year), the transitions on an area graph are not rendered properly. They seem to be "tearing" the area.