Implement showing gps data when clicking on point

sohstationviewer/view/plotting/gps_dialog.py

@@ -21,7 +21,7 @@ class GPSWidget(QtWidgets.QWidget):
     def __init__(self, parent, tracking_box):
         super().__init__(parent)
         self.tracking_box = tracking_box
-        self.gps_points = None
+        self.gps_points: List[GPSPoint] = None
 
         self.fig = Figure(figsize=(6, 6), dpi=100)
         self.canvas = Canvas(self.fig)
@@ -67,6 +67,27 @@ class GPSWidget(QtWidgets.QWidget):
         msg = f'Plotted {len(self.gps_points)} points.'
         displayTrackingInfo(self.tracking_box, msg)
 
+    def on_pick_event(self, event):
+        artist = event.artist
+        if isinstance(artist, plt.Line2D):
+            # index of the clicked point on the plot
+            click_plot_index = event.ind[0]
+            picked_point = self.gps_points[click_plot_index]
+
+            lat_dir = 'N' if picked_point.latitude > 0 else 'S'
+            long_dir = 'E' if picked_point.longitude > 0 else 'W'
+            meta_separator = ' ' * 22
+            loc_separator = ' ' * 10
+            msg = (
+                f'Mark: {picked_point.last_timemark}{meta_separator}'
+                f'Fix: {picked_point.fix_type}{meta_separator}'
+                f'Sats: {picked_point.num_satellite_used}<br>'
+                f'Lat: {lat_dir}{picked_point.latitude:.6f}{loc_separator}'
+                f'Long: {long_dir}{picked_point.longitude:.6f}{loc_separator}'
+                f'Elev: {picked_point.height}{picked_point.height_unit}'
+            )
+            displayTrackingInfo(self.tracking_box, msg)
+
 
 class GPSDialog(QtWidgets.QWidget):
     def __init__(self, parent=None):