Closest point on segment

This example shows an algorithm to find the closest point on a segment, given another point. The code is almost completely taken from the answer by Justin L. to this stackoverflow post.

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<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Closest point on segment</title>
    <link type="text/css" href="index.css" rel="stylesheet"/>
    <script src="https://d3js.org/d3.v3.min.js"></script>
  </head>
  <body>
    <svg height="500" width="960"></svg>
    <script src="index.js"></script>
  </body>
</html>
    

Modified http://d3js.org/d3.v3.min.js to a secure url

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