javascript - How can I add a background circle to a sunburst plot? -

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how add background circle sunburst plot in d3? i'm using standard zoomable sunburst example:

enter image description here

i want full circle of specified color, highlight 'jaggy-ness' of particular display.

all need append circle svg first thing after creating it:

svg.append("circle").attr("r", radius).style("fill", "pink");

complete example here.


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