Force Vertical Gravity

Force layout with vertical gravity.

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<!DOCTYPE html>
<html lang="en">
  <head>
    <script src="//d3js.org/d3.v3.min.js"></script>
  </head>
​
  <style>
  svg {
    overflow: visible;
    border: solid 1px #666;
  }
​
  .node {
    fill-opacity: 0.8;
    stroke: #fff;
    stroke-width: 2;
  }
  </style>
​
  <body>
​
  <svg class="gravity"></svg>
​
  <script type="text/javascript" src="main.js"></script>
  </body>
</html>
​
    

https://d3js.org/d3.v3.min.js