D3 update pie data with zero values

Question

I am updating a pie chart with a dynamic JSON feed. My update function is below

function updateChart(data) {
arcs.data(pie(data)); // recompute angles, rebin         


        

Answer 1

You've actually hit a bug in D3 there -- if everything is zero, the pie layout returns angles of NaN, which cause errors when drawing the paths. As a workaround, you can check whether everything is zero and handle this case separately. I've modified your change function as follows.

if(data.filter(function(d) { return d.totalCrimes > 0; }).length > 0) {
  path = svg.selectAll("path").data(pie(data));
  path.enter().append("path")
      .attr("fill", function(d, i) { return color(d.data.crimeType); })
      .attr("d", arc)
      .each(function(d) { this._current = d; });
  path.transition().duration(750).attrTween("d", arcTween); // redraw the arcs
} else {
  path.remove();
}

Complete jsbin here.