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HTML

              
                <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.7.0/d3.min.js"></script>
<button onclick='init()'>randomize</button><br>
<span id="donut"></span>



              
            
!

CSS

              
                 label {
    display: block;
  }
  span {
    display: inline-block;
  }
  path.label {
    stroke-width: 1.4;
    stroke: black;
  }
  text {
    font-size: 16px;
    font-family: arial;
    dominant-baseline: middle;
    text-anchor: middle;  
  }
              
            
!

JS

              
                init();  

function init(){

  let count = 3 + Math.floor(Math.random() * 3);  
  let data = Array(count).fill(0).map((d, i) => {
    return { value: 111 + 111*Math.random(), selected: true }
  });

  let size = 300, time = 500; 
  let colors = d3.scaleOrdinal(d3.schemeCategory10);
  let donut =  d3.select('#donut').html(' ');
    
  donut.append('span').selectAll('input')
    .data(data).enter()
    .append('label').style('background-color', (d, i) => colors(i))
    .append('input').attr('type', 'checkbox').attr('checked', true)
    .on("change", function (d) { 
      update(d.selected = this.checked); 
    });

  let svg = donut.append('span').append("svg")
              .attr("viewBox", `-${size} -${size/2} ${size*2} ${size}`).attr("height", size);


  let pie = d3.pie().sort(null);
  let arc = d3.arc().innerRadius(size/3.1-30).outerRadius(size/3.1)
                    .cornerRadius(33);
  let arc2 = d3.arc().innerRadius(size/2.7).outerRadius(size/2.7);
  let arc3 = d3.arc().innerRadius(size/2.2).outerRadius(size/2.2);
  let line = d3.line();

  let d = pie(data.map(d => d.value)).map(d=>{
      d.value &&(d.endAngle+=0.3);
      return d;
  });
    
  let groupsl = svg.selectAll("g.l").data(d)
                  .enter().append("g").attr('opacity', 1);
  let groupsr = svg.selectAll("g.r").data(d)
                  .enter().append("g").attr('opacity', 1);
  let sectorsl = groupsl.append("path").classed("sectorl", true)
    .attr("fill", (d, i) => colors(i));
    
  let sectorsr = groupsr.append("path").classed("sectorr", true)
                      .attr("fill", (d, i) => colors(i));

  let titlesPaths = groupsl.append("path").classed("label", true);

  let titlesTexts = groupsl.append("text").text(d => d.value.toFixed(0));

  let totalText = svg.append('text').style('font-size', 22).attr('y', 2);

               
  sectorsl.transition().duration(time).attrTween('d', growSectorsPathsl); 
  sectorsr.transition().duration(time).attrTween('d', growSectorsPathsr); 
  titlesPaths.transition().duration(time).attr('opacity', 1)
             .attrTween('d', growTitlesPaths); 

  titlesTexts.transition().duration(time)
          .attrTween("x", tweenTitlesTextsX)
          .attrTween("y", tweenTitlesTextsY);
          
  totalText.datum(calcTotal()).transition().duration(time)
           .tween("text", interpolateTotal)

  function update() {
      d = pie(data.map(d => d.selected ? d.value : 0)).map(d=>{
          d.value &&(d.endAngle+=0.3);
          return d;
      });

      sectorsl.data(d).transition().duration(time)
          .attrTween("d", tweenSectorsPathsl);
      sectorsr.data(d).transition().duration(time)
          .attrTween("d", tweenSectorsPathsr);

      groupsl.data(d).transition().duration(time)
          .attr('opacity', d => d.value ? 1 : 0)
      groupsr.data(d).transition().duration(time)
          .attr('opacity', d => d.value ? 1 : 0)
      
      titlesPaths.data(d).transition().duration(time)
          .attrTween("d", tweenTitlesPaths);

      titlesTexts.data(d).transition().duration(time)
          .attrTween("x", tweenTitlesTextsX)
          .attrTween("y", tweenTitlesTextsY);

      totalText.datum(calcTotal()).transition().duration(time)
           .tween("text", interpolateTotal) 
  }

  function growTitlesPaths(d) {
      let i = d3.interpolate(size/4, size/2.7);
      return t => {
        let r = i(t);
        arc2.innerRadius(r).outerRadius(r);
        return line([arc.centroid(this._current = d),arc2.centroid(d)]);
      }
  }

  function growSectorsPathsl(d) {
     let c = (d.startAngle+d.endAngle)/2;
     let il = d3.interpolate(c, d.startAngle);
     return t => {
       d.startAngle = il(t);
       d.endAngle = c+0.2;
       return arc(this._current = d);
     }; 
  }
    
   function growSectorsPathsr(d) {
     let c = (d.startAngle+d.endAngle)/2;
     let ir = d3.interpolate(c, d.endAngle)
     return t => {
       d.startAngle = c-0.2;
       d.endAngle = ir(t);
       return arc(this._current = d);
     }; 
  }

  function tweenSectorsPathsl(d) {
    let i = lerp(this, d);
    return t => {
        let v = i(t);
        v.endAngle = (v.startAngle+v.endAngle)/2+0.2;
        return arc(v);
    };
  }
    
  function tweenSectorsPathsr(d) {
    let i = lerp(this, d);
    return t => {
        let v = i(t);
        v.startAngle = (v.startAngle+v.endAngle)/2-0.2;
        return arc(v);
    };
  }

  function tweenTitlesPaths(d) {
    let i = lerp(this, d);
    return t => line([arc.centroid(i(t)), arc2.centroid(i(t))]);
  }

  function tweenTitlesTextsX(d) {
    let i = lerp(this, d, '_currentX');
    return t => arc3.centroid(i(t))[0];
  }

  function tweenTitlesTextsY(d) {
    let i = lerp(this, d, '_currentY');
    return t => arc3.centroid(i(t))[1];
  }

  function interpolateTotal(d) {
    let i = lerp(this, d);
    return t => Math.round(i(t));
  }

  function lerp(el, d, key){
    key = key || '_current';
    return d3.interpolate(el[key] || 0, el[key] = d);
  }

  function calcTotal() {
    return data.map(d => d.selected ? d.value : 0)
               .reduce((a,v) => a + v, 0)
  }

  function interpolateTotal(d) {
    let that = d3.select(this);
    let i = lerp(this, d);
    return t => that.text(Math.floor(i(t)))
  }
}
              
            
!
999px

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