D3 Examples - Tween - Interpolate

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>
​
<body>
  <script>
    // Feel free to change or delete any of the code you see in this editor!
    var svg = d3.select("body").append("svg")
      .attr("width", 960)
      .attr("height", 500)
​
    var text = svg.append("text")
      .text(0)
      .attr("y", 960 / 4)
      .attr("x", 500)
      .attr("font-size", 36)
      .attr("font-family", "monospace")
        .transition().duration(5000).tween("text", function() {
            var that = d3.select(this);
          var i = d3.interpolate(0, 1000);
          return function(t) {
            console.log("%O - %O", t, i(t));
            that.text(i(t).toFixed(1));
          }
        })
​
  </script>
</body>
​
    