PanUpdatedEventArgs should provide you with some way of get the current window-relative position of the pan gesture

[whodges]

Description

PanUpdatedEventArgs should provide you with some way of get the window-relative current position of the pan gesture, just like TappedEventArgs.GetPosition does.

Public API Changes

Just add a property like PanUpdatedEventArgs.GetPosition.

public SampleClass
{
    private Point _lastPosition;

    public SampleClass(IGestureRecognizers view)
    {
        var recognizer = new PanGestureRecognizer();
        view.GestureRecognizers.Add(recognizer);
        recognizer.PanUpdated += OnPanUpdated;
    }

    private void OnPanUpdated(object sender, PanUpdatedEventArgs e)
    {
        switch (e.StatusType)
        {
            case GestureStatus.Started:
                _lastPosition = e.GetPosition;   // New API change
                break;
            case GestureStatus.Running:
                var currentPosition = e.GetPosition;    // New API change
                // Do something with _lastPosition and currentPosition
                _lastPosition = currentPosition;
                break;
            case GestureStatus.Completed:
                break;
        }
    }
}

Intended Use-Case

This would allow a user to do more with a pan gesture than they currently can. A simple example would be for rotation of a 3D scene. Typically, that requires projecting the current and last pan operation positions onto a virtual hemisphere centered in the viewport, and determining the rotation matrix from those projections. PanUpdatedEventArgs.TotalX and PanUpdatedEventArgs.TotalY are insufficient in that regard (but should remain as they're obviously useful in other scenarios).

[whodges]

Also, I understand that Pan can have multiple touch points. So alternatively, maybe PanUpdatedEventArgs could contain a TouchPositions array/list/enumerable of the window position of each touch point.