Return calculated ENU displacement from plot_stationary_position_erro…

…r().

python/fusion_engine_client/analysis/analyzer.py

@@ -858,32 +858,32 @@ def plot_stationary_position_error(self, truth_lla_deg):
         @param truth_lla_deg The truth LLA location (in degrees/meters).
         """
         truth_ecef_m = np.array(geodetic2ecef(*truth_lla_deg, deg=True))
-        self._plot_pose_displacement(title='Position Error', center_ecef_m=truth_ecef_m)
+        return self._plot_pose_displacement(title='Position Error', center_ecef_m=truth_ecef_m)
 
     def plot_pose_displacement(self):
         """!
         @brief Generate a topocentric (top-down) plot of position displacement, as well as plot of displacement over
                time.
         """
-        self._plot_pose_displacement()
+        return self._plot_pose_displacement()
 
     def _plot_pose_displacement(self, title='Pose Displacement', center_ecef_m=None):
         if self.output_dir is None:
-            return
+            return None
 
         # Read the pose data.
         result = self.reader.read(message_types=[PoseMessage], source_ids=self.default_source_id, **self.params)
         pose_data = result[PoseMessage.MESSAGE_TYPE]
 
         if len(pose_data.p1_time) == 0:
             self.logger.info('No pose data available. Skipping displacement plots.')
-            return
+            return None
 
         # Remove invalid solutions.
         valid_idx = np.logical_and(~np.isnan(pose_data.p1_time), pose_data.solution_type != SolutionType.Invalid)
         if not np.any(valid_idx):
             self.logger.info('No valid position solutions detected. Skipping displacement plots.')
-            return
+            return None
 
         time = pose_data.p1_time[valid_idx] - float(self.t0)
         solution_type = pose_data.solution_type[valid_idx]
@@ -906,6 +906,8 @@ def _plot_pose_displacement(self, title='Pose Displacement', center_ecef_m=None)
         self._plot_displacement(source=title, title=axis_title, time=time, solution_type=solution_type,
                                 displacement_enu_m=displacement_enu_m, std_enu_m=std_enu_m)
 
+        return displacement_enu_m
+
     def plot_relative_position(self):
         """!
         @brief Generate a topocentric (top-down) plot of relative position vs base station, as well as plot of relative