How to calculate focusPointOfInterest for AVCaptureDevice?

Question

How do you calculate focusPointOfInterest (CGPoint value from 0.0 to 1.1) for a given AVCaptureDevice?

I followed code examples from the latest WWDC, but I really don't understand how the calculation is done. In addition, my application sits in a landscape or portrait (as in the example) ... therefore, except that you don’t understand how things are calculated, I’m not sure what adjustments I need to make to take into account landscape orientation.

Any help would be appreciated.

Thanks - wg

Answer 1

AVCaptureVideoPreviewLayer, captureDevicePointOfInterestForPoint, CGPoint, .

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Answer 2

http://developer.apple.com/library/ios/#documentation/AudioVideo/Conceptual/AVFoundationPG/Articles/03_MediaCapture.html:

CGPoint, {0,0} , {1,1} "" - , .