Selected Rounding of Corners in Arc

[dtrinh100]

Hi, I would love to see the ability to round only specific corners in an arc. Right now, I know we have the ability to round all corners using cornerRadius, but most of the time I find myself only wanting to round 2 corners, rather than all of them.

[mbostock]

Mind sharing a visual example of what you want?

[dtrinh100]

Sure, so something like this:

The way that I am doing something like this in D3 right now is using the arc generator to generate 2 non overlapping arc, then adding a rounded corner to said arcs, but this creates an issue where the arcs that meet each other is also rounded, which is not exactly what I want.

[krystofbe]

i think this PR adds this capability

Here is a custom build d3.mjs.zip of D3 version 7.9.0 (d3.mjs) that includes these changes for immediate use.