title: One step affine transform for rotation around a point?
body: <p>How can I make a Core Graphics affine transform for rotation around a point x,y of angle a, using only a single call to CGAffineTransformMake() plus math.h trig functions such as sin(), cos(), etc., and no other CG calls.</p>
  
  <p>Other answers here seem to be about using multiple stacked transforms or multi-step transforms to move, rotate and move, using multiple Core Graphics calls.  Those answers do not meet my specific requirements.</p>