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When dealing with cocos2d-iphone, one may find that they want to perform an action that is not within the toolkit. Luckily cocos allows you to easily write your own and it's a good thing because we found the need to arbitrarily rotate a CocosNode around a given point by a given number of degrees. We are calling this action RotateAround, and it will take a duration, a point to rotate around, and the number of degrees to rotate by. Our interface code merely looks like this:

@interface RotateAround : IntervalAction  
{
  CGPoint _centerPt;
  float  _startAngle;
  float  _radius;
  float  _spanAngle;
}
+(id) actionWithDuration:(ccTime)duration
                     centerPoint:(CGPoint)cpt 
                      spanAngle:(float)spanAngle;
-(id) initWithDuration:(ccTime)duration 
                centerPoint:(CGPoint)cpt 
                 spanAngle:(float)spanAngle;
@end