private void GazeInputSourcePreview_GazeMoved()

in Tools/Positioning/MainPage.xaml.cs [48:116]

• 50 lines of code
• 9 McCabe index (conditional complexity)

        private void GazeInputSourcePreview_GazeMoved(GazeInputSourcePreview sender, GazeMovedPreviewEventArgs args)
        {
            var sb = new StringBuilder();

            sb.Append("      GazePos (");
            if (args.CurrentPoint.EyeGazePosition != null)
            {
                Canvas.SetLeft(GazePositionEllipse, args.CurrentPoint.EyeGazePosition.Value.X);
                Canvas.SetTop(GazePositionEllipse, args.CurrentPoint.EyeGazePosition.Value.Y);

                sb.Append($"{args.CurrentPoint.EyeGazePosition.Value.X,6}px, {args.CurrentPoint.EyeGazePosition.Value.Y,6}px");

                if (showGaze)
                {
                    GazePositionEllipse.Visibility = Visibility.Visible;
                }
                else
                {
                    GazePositionEllipse.Visibility = Visibility.Collapsed;
                }
            }
            else
            {
                GazePositionEllipse.Visibility = Visibility.Collapsed;
            }
            sb.AppendLine(")");

            if (args.CurrentPoint.HidInputReport != null)
            {
                var hidReport = args.CurrentPoint.HidInputReport;
                var sourceDevice = args.CurrentPoint.SourceDevice;

                if (gazeHidPositionsParser == null)
                {
                    gazeHidPositionsParser = new GazeHidPositionsParser(sourceDevice);
                }

                var positions = gazeHidPositionsParser.GetGazeHidPositions(hidReport);

                // The return values for the left and right eye are in micrometers by default
                // They are references such that X and Y origin are the top left hand corner
                // of the calibrated display. The Z origin is the centerpoint of the display
                // (not the tracker). As such, there is a minor difference between the actual
                // sensor-to-eye distance vs the reported distance for left/right eye position.

                UpdateEyeData("Left", positions.LeftEyePosition, LeftEyePositionEllipse, sb);
                UpdateEyeData("Right", positions.RightEyePosition, RightEyePositionEllipse, sb);

                if (positions.RightEyePosition != null && positions.LeftEyePosition != null)
                {
                    // calculate IPD in mm
                    var interPupilaryDistance = (positions.RightEyePosition.X - positions.LeftEyePosition.X) / 1000.0;

                    sb.AppendLine($"          IPD ({interPupilaryDistance,6:F2}mm)");
                }

                if (positions.HeadPosition != null)
                {
                    sb.AppendLine($"HeadPosition ({positions.HeadPosition.X,8:F2}, {positions.HeadPosition.Y,8:F2}, {positions.HeadPosition.Z,8:F2})");
                }

                if (positions.HeadRotation != null)
                {
                    sb.AppendLine($"HeadRotation ({positions.HeadRotation.X,8:F2}, {positions.HeadRotation.Y,8:F2}, {positions.HeadRotation.Z,8:F2})");
                }
            }

            StatusTextBlock.Text = sb.ToString();
        }