piecewiseObject = d3.piecewise([
{ opacity: 0.1, r: 1, cx: 0, cy: 0, fill: "red" },
{ r: 10, opacity: 0.5, cx: 150, cy: 100, fill: "orange" },
{ r: 100, opacity: 1, cx: 120, cy: 110, fill: "yellow" },
{ r: 200, opacity: 0.1, cx: 300, cy: 50, fill: "lime" }
])