Core Location extensions for bearing and distance. See http://daveaddey.com/?p=120 for details
The functions are:
- (double)bearingInRadiansTowardsLocation:(CLLocation *)towardsLocation;
- (CLLocation *)newLocationAtDistance:(CLLocationDistance)atDistance alongBearingInRadians:(double)bearingInRadians;
- (CLLocation *)newLocationAtDistance:(CLLocationDistance)atDistance towardsLocation:(CLLocation *)towardsLocation;
You would use them as follows:
double theBearing = [theStartLocation bearingInRadiansTowardsLocation:theEndLocation];
CLLocation *theNewLocation = [theStartLocation newLocationAtDistance:150.0 alongBearingInRadians:4.0];
CLLocation *theNewLocation = [theStartLocation newLocationAtDistance:150.0 towardsLocation:theEndLocation];
…where theStartLocation and theEndLocation are existing CLLocation instances, and distances are in metres.