title: Methods to detect touches on a coreplot graph
body: <p>I've been looking into coreplot. I've got a graph plotted, but I'm looking to detect touches on it in a similar way to "touchesBegan" "touchesMoved" etc.</p>
  
  <p>I've seen a lot of very vague stuff about the methods used such as</p>
  
  <pre><code> "- plotSpace:shouldHandlePointingDeviceDownEvent:atPoint:"
  </code></pre>
  
  <p>But I'm getting nowhere with them. Any tips?</p>