zoom.scaleTo(selection, k)
If selection is a selection, scales the current zoom transform of the selected elements to k, such that the new k₁ = k. If selection is a transition, defines a “zoom” tween translating the current transform. This method is a convenience method for zoom.transform. The k scale factor may be specified either as numbers or as functions that returns numbers. If a function, it is invoked for each selected element, being passed the current datum d
and index i
, with the this
context as the current DOM element.
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