private void AddMarker(RoiPoint point)
        {
            var m = new GMarkerGoogle(point.Point, point.Marker)
            {
                ToolTipText = $"ROI #{point.No}\n" + point.Point,
                ToolTipMode = MarkerTooltipMode.OnMouseOver,
            };

            this.mapOverlay.Markers.Add(m);
        }
        private void TrackPoint(PointLatLngAlt gimbalPoint)
        {
            var screenshotPath = DateTime.Now.ToString("yyyyMMdd-HHmmss") + ".jpg";
            var result         = false; //Capturer.ScreenCapture.Capture("gst-launch-1.0", screenshotPath);

            var point = new PointLatLngAlt(gimbalPoint);
            var p     = new RoiPoint(point, this.roiPoints.Count + 1)
            {
                ScreenshotPath = result ? screenshotPath : null
            };

            this.roiPoints.Add(p);
            this.AddMarker(p);
        }