Alteridem.WinTouch.Demo.GestureControl.OnRotate C# (CSharp) Method

        void OnRotate( object sender, RotateEventArgs e )
        {
            string msg = string.Format( "Rotate Loc:({0},{1}) Angle:{2}", e.Location.X, e.Location.Y, e.TotalDegrees );
            Debug.WriteLine( msg );

            if ( !e.Begin && !e.End )
            {
                _rotation -= e.Degrees;
                Invalidate();
            }
        }