Bubble Update Pattern II by HarryStevens

Like Bubble Update Pattern I but with the circles drawn as SVG path elements instead of circle elements. Uses a custom function called circleToPath to draw paths that look like circles.
This uses a couple of my libraries: jeezy and shape2path.
index.html

<html>
  <head>
    <style>
    body {
      margin: 0;
      font-family: "Helvetica", sans-serif;
    }
    text {
      text-anchor: middle;
      fill: #fff;
    }
    </style>
  </head>
  <body>
    <script src="https://d3js.org/d3.v4.min.js"></script>
    <script src="https://unpkg.com/shape2path@2.0.0/build/shape2path.min.js"></script>
    <script src="https://unpkg.com/jeezy@1.12.0/lib/jeezy.min.js"></script>
    <script>
    var alphabet = "abcdefghijklmnopqrstuvwxyz".split("");

    var width = window.innerWidth, height = window.innerHeight;

    var svg = d3.select("body").append("svg").attr("width", width).attr("height", height);

    var pack = d3.pack()
        .size([width, height])
        .padding(1.5);

    redraw(randomizeData());
    d3.interval(function(){
      redraw(randomizeData());
    }, 1500);

    function redraw(classes){

      // hierarchy
      var h = d3.hierarchy({children: classes})
          .sum(function(d) { return d.size; })

      //JOIN
      var circle = svg.selectAll("path")
          .data(pack(h).leaves(), function(d){ return d.data.name; });

      var text = svg.selectAll("text")
          .data(pack(h).leaves(), function(d){ return d.data.name; });

      //EXIT
      circle.exit()
          .style("fill", "#b26745")
        .transition()
          .attr("d", function(d){ return shape2path.circle({cx: d.x, cy: d.y, r: 1e-6}); })
          .remove();

      text.exit()
        .transition()
          .attr("opacity", 1e-6)
          .remove();

      //UPDATE
      circle
        .transition()
          .attr("d", function(d){ return shape2path.circle({cx: d.x, cy: d.y, r: d.r}); })
          .style("fill", "#3a403d");

      text
        .transition()
          .attr("x", function(d){ return d.x; })
          .attr("y", function(d){ return d.y; });

      //ENTER
      circle.enter().append("path")
          .attr("d", function(d){ return shape2path.circle({cx: d.x, cy: d.y, r: 1e-6}); })
          .style("fill", "#fff")
        .transition()
          .attr("d", function(d){ return shape2path.circle({cx: d.x, cy: d.y, r: d.r}); })
          .style("fill", "#45b29d");

      text.enter().append("text")
          .attr("opacity", 1e-6)
          .attr("x", function(d){ return d.x; })
          .attr("y", function(d){ return d.y; })
          .attr("dy", 6)
          .text(function(d){ return d.data.name; })
        .transition()
          .attr("opacity", 1);
    }

    function randomizeData(){
      var out = [];
      var shuffled = jz.arr.shuffle(alphabet);
      for (var i = 0; i < jz.num.randBetween(1, alphabet.length); i++){
        out.push({name: shuffled[i], size: jz.num.randBetween(1, 10)});
      }
      return out;
    }

    </script>
  </body>
</html>