title: Extending line/area chart lines to chart edges
body: <p>I'm working on a custom-styled line/area chart, based on this reference image:  </p>
  
  <p><img src="https://i.stack.imgur.com/IN9x0.png" alt="Chart reference"></p>
  
  <p>I have most implemented, but, I'm struggling with the lines getting extended to the edges of the chart.</p>
  
  <p>Here is my fiddle: <a href="http://jsbin.com/ePilePe/3/edit?js,output" rel="nofollow noreferrer">http://jsbin.com/ePilePe/3/edit?js,output</a></p>
  
  <p>As you can see in the image, the first point, the last point on X axis has a ray extending to the end of the chart, where in my fiddle there is no such thing.</p>
  
  <p>I've been digging through the API, docs for quite some time now, but cannot find any relevant information.</p>
  
  <p>How would I achieve such behavior?</p>