MissionPlanner.GridUI.getFOVangle C# (CSharp) Method

        void getFOVangle(ref double fovh, ref double fovv)
        {
            double focallen = (double)NUM_focallength.Value;
            double sensorwidth = double.Parse(TXT_senswidth.Text);
            double sensorheight = double.Parse(TXT_sensheight.Text);

            fovh = (float)(Math.Atan(sensorwidth / (2 * focallen)) * rad2deg * 2);
            fovv = (float)(Math.Atan(sensorheight / (2 * focallen)) * rad2deg * 2);
        }