Learn D3.js

Inertia

When you move the mouse the globe starts spinning, and when you stop, it stops immediately. Perhaps you wish it would react more naturally, slowing down until stopping. You can include this behavior using a simple plugin created by Philipe Rivière called inertia.js, documented at github.com/Fil/d3-inertia. You don't have to implement any methods, just include the versor.js and inertia.js libraries in your page:

<script src="https://unpkg.com/versor"></script><script src="https://unpkg.com/d3-inertia"></script>

And add a single line in your code. In many of the examples we created in this section, you can add:

d3.geoInertiaDrag(svg, () => render(), projection); 

The d3.geoInertiaDrag(view, render, projection, options) function takes ...