Dynamic smoothing interpolation

[DanTsk]

Hello. Is it any way to dynamically set curve smoothing like on the screenshot below?
Really need such functionality.

[Fil]

This looks like it would be a mix of curveStep and curveCardinal? I'm afraid you'll probably have to write your own custom curve.

[mbostock]

I think this is asking for line simplification, which is not provided by d3-shape, but is available for example in topojson.

https://bl.ocks.org/mbostock/5732029