Updated previous bl.ock which used transparent circles——this version using voronoi
Note: Toggle grid via button top right.
Inspiration:
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<html lang="en">
<head>
<meta charset="utf-8">
<title>d3 | hotspots | voronoi</title>
<meta name="author" content="Sundar Singh | eesur.com">
<link rel="stylesheet" href="main.css">
<script src="https://d3js.org/d3.v3.min.js" charset="utf-8"></script>
</head>
<body>
<header>
<h1>move over planets</h1>
<p>Duration in years to 'planets'</p>
<nav><button id="grid-bt">VORONOI GRID</button></nav>
</header>
<section id="vis"></section>
<script src="d3_code_hotspots.js" charset="utf-8"></script>
</body>
</html>
Modified http://d3js.org/d3.v3.min.js to a secure url
https://d3js.org/d3.v3.min.js