title: iPhone - How to make a circle path for a CAKeyframeAnimation?
body: <p>I'm trying to make an key frame animation that lets a image view fly around a circle. I'm using <code>CGPathAddCurveToPoint</code> to make the key frame points. The problem is that the image view always uses the shortest (linear) route.</p>
  
  <p>I would like to have some kind of function that builds a circle path for a given radius.</p>
  
  <p>Thanks a lot for any help.</p>