Condegram Spiral Plot

Condegram Spiral Plot to show data over time on a spiral curve.

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<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html;charset=utf-8">
    <title>Condegram Spiral Plot</title>
      <link rel="stylesheet" type="text/css" href="style.css"/>
      <script data-require="d3@4.0.0" data-semver="4.0.0" src="https://d3js.org/d3.v4.js"></script>
  </head>
  <body>
    <div id="chart"></div>
    <script type="text/javascript" src="main.js"></script>
  </body>
</html>
    

https://d3js.org/d3.v4.js