John Firebaugh 12c07b916b Rework easing transition code ...

This brings the easing transition code a bit closer to how easings work
in gl-js. Instead of having an array of individual transitions for scale,
rotate, and pan, there is a single transition function that does all the
required calculations. This permits us to:

* Eliminate the "timeout" transition. (Fixes #126)
* Replace start/stopPanning() et al with setGestureInProgress(). Apps or
  SDKs are expected to make paired calls to setGestureInProgress(). This
  state will be ORed with the active easing state to determine when to
  use texture interpolation. (Fixes #79)
* Run style recalculations only when an ease transition that affects the
  zoom is in progress. (Fixes #1155)

2015-04-02 16:12:29 -07:00

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