title: Crosshatch in IOS using CoreGraphics?
body: <p>How would one crosshatch (apply a set of parallel lines at 45 degrees) across the fill of a shape in IOS using core graphics?   Sample code?  </p>
  
  <p>(I'm specially interested in use with an MKPolygon in MKMapKit, however for the moment just trying to see if it's possible in a UIView using drawRect?.   So fill the background of a UIView with crosshatch'ing)</p>