arc ring v5

<!DOCTYPE html>
<meta charset="utf-8">
<style>

.paths--straight {
  fill: none;
  stroke: transparent;
}

.paths--round {
  fill: #ccc;
  opacity: 0.5;
}
  
  
</style>
<body>
<script src="https://d3js.org/d3.v5.min.js"></script>
<script>

// https://encycolorpedia.com/ff0e45

var pie = d3.pie();

var arc = d3.arc()
    .outerRadius(outerRadius);

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height)
  .append("g")
    .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
 
let getFill = (i) => {
  return sentimentColors[i];
};  
  
var roundPath = svg.append("g")
    .attr("class", "path--round")
  .selectAll("path")
    .data(sentimentValues)
  .enter().append("path")
						.attr("opacity", 0.5)
						.attr("fill", function(d,i){return getFill(i)});

var ease = d3.easeCubic;

const timer = d3.timer(function(elapsed) {
  
  //var t = ease(1 - Math.abs((elapsed % duration) / duration - .5) * 2);
  
  const duration = 2500;
  const t = 1 - Math.abs((elapsed % 2500) / 2500 - .5) * 2;
  
  let sentimentValues = sentimentData.map( function(node){return node.value});
  
  const arcs = pie.padAngle(t * .01)(sentimentValues);

arc.innerRadius(outerRadius / (2 - t));
 
  roundPath.data(arcs).attr("d", arc.cornerRadius(cornerRadius));

if (t > 0.8) timer.stop();

},150);

</script>

https://d3js.org/d3.v5.min.js