title: Converting CLLocation objects to MKMapPoint structs
body: <p>I would like to create a <code>MKPolygon</code> to display on a <code>MKMapView</code>.  My problem is that I'm not able to figure out how to do it.  </p>
  
  <p>I know that to create an <code>MKPolygon</code> I have to create a bunch of <code>MKMapPoint</code> structs and put them into an array and call the class method <code>polygonWithPoints</code>.</p>
  
  <p>My problem is that I have an <code>NSArray</code> containing <code>CLLocation</code> objects that have  <code>coordinate.latitude</code> and <code>coordinate.longitude</code> properties.</p>
  
  <p>How do I convert it one by one to an <code>MKMapPoint</code> struct?</p>