d3 arc diagram - add top semi circles
问题 http://jsfiddle.net/pRkpL/ and http://fiddle.jshell.net/pRkpL/show/ I am making an arc diagram which is based heavily on this demo: http://bl.ocks.org/sjengle/5431779. It's taken me a while to get to this stage, and the graph now adapts to the data in all the ways I need it to. However, I have 2 questions: 1) I need to create 2 arc diagrams - one above the black rectangles (named buckets in the code) and one below. As a temporary fix, I have used css3 3D transforms to flip one of the arc