title: d3-force Make nodes move slower on position update
body: <p>I'm using d3's force-layout and would like to move nodes on an event trigger.</p>
  
  <p>I've created a <a href="https://bl.ocks.org/jwilber/9843a2270f58e95831af4ef796676ea1/ea86abb050db0f2cfb50899b39ad347ff035cf09" rel="nofollow noreferrer">a minimal block here</a> showing the desired functionality.</p>
  
  <p>As you can see, when the button is clicked, the nodes move rapidly to their new position. I'd like to slow this down. I've played with combinations of (what I thought to be) relevant attributes specified in the <a href="https://github.com/d3/d3-force" rel="nofollow noreferrer">documentation</a> (e.g. <code>alpha</code>, <code>alphaDecay</code>, <code>velocityDecay</code>), but to no avail.</p>
  
  <p>To recap: <strong>how do I make the nodes move slower on position updates?</strong></p>
  
  <p>Thanks!</p>