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mbostock

Manual Axis Interpolation

D3's axis component supports automatic interpolation; simply change the scale, create a transition, and call the axis. The axis component will automatically create a smooth transition.

However, it's also possible to create a custom tween and redraw the axis synchronously for each frame of the transition. If you wanted to display intermediate ticks for a long-running transition, this might be preferred to the default behavior. This example shows a slow zoom from three years to one day.