D3 Examples - arc ring v5

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<!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
​
  const sentimentData = [{label: "frontend dev", value:70, color:"#00f1ba"}, 
                             {label: "design", color:"#999", value:20}, 
                             {label: "data viz", value:10, color:"#ea0061"}];
  
let getSentimentValues = () => {
   return sentimentData.map( function(node){return node.value});
};
  
let getSentimentColor = () => {
   return sentimentData.map( function(node){return node.color});
};
  
let sentimentValues = getSentimentValues();
let sentimentColors = getSentimentColor();  
  
var width = 300,
    height = 300,
    outerRadius = height / 2 - 30,
    cornerRadius = 5;
​
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>
    