map.centerZoomEase

[bhousel]

We have:

• map.center()
• map.zoom()
• map.centerZoom()

... for instantaneous changes that dispatch a 'move' event.

We later added:

• map.centerEase()
• map.zoomEase()
• map.transformEase()

... that build on d3.zoom transform and support transitions. The 'move' event fires later.

• For simplicity, all of these things should be refactored to wrap the internal setTransform()

Also we don't have:

• map.centerZoomEase()

There are many places in the walkthrough that I'd use this.