Bugfix: Elevation in charts smoothing removed as it was broken.

Fixes #1241.

src/main/java/de/dennisguse/opentracks/chart/ChartFragment.java

@@ -188,9 +188,9 @@ public class ChartFragment extends Fragment implements TrackDataHub.Listener {
         }
     }
 
-    public void onSampledInTrackPoint(@NonNull TrackPoint trackPoint, @NonNull TrackStatistics trackStatistics, Speed smoothedSpeed, Altitude smoothedAltitude) {
+    public void onSampledInTrackPoint(@NonNull TrackPoint trackPoint, @NonNull TrackStatistics trackStatistics, Speed smoothedSpeed) {
         if (isResumed()) {
-            ChartPoint point = new ChartPoint(trackStatistics, trackPoint, smoothedSpeed, smoothedAltitude, chartByDistance, viewBinding.chartView.getUnitSystem());
+            ChartPoint point = new ChartPoint(trackStatistics, trackPoint, smoothedSpeed, chartByDistance, viewBinding.chartView.getUnitSystem());
             pendingPoints.add(point);
         }
     }

src/main/java/de/dennisguse/opentracks/chart/ChartPoint.java

@@ -29,15 +29,15 @@ public class ChartPoint {
         this.altitude = altitude;
     }
 
-    public ChartPoint(@NonNull TrackStatistics trackStatistics, @NonNull TrackPoint trackPoint, Speed smoothedSpeed, Altitude smoothedAltitude, boolean chartByDistance, UnitSystem unitSystem) {
+    public ChartPoint(@NonNull TrackStatistics trackStatistics, @NonNull TrackPoint trackPoint, Speed smoothedSpeed, boolean chartByDistance, UnitSystem unitSystem) {
         if (chartByDistance) {
             timeOrDistance = trackStatistics.getTotalDistance().toKM_Miles(unitSystem);
         } else {
             timeOrDistance = trackStatistics.getTotalTime().toMillis();
         }
 
-        if (smoothedAltitude != null) {
-            altitude = Distance.of(smoothedAltitude.toM()).toM_FT(unitSystem);
+        if (trackPoint.hasAltitude()) {
+            altitude = Distance.of(trackPoint.getAltitude().toM()).toM_FT(unitSystem);
         }
 
         if (smoothedSpeed != null) {

src/main/java/de/dennisguse/opentracks/data/TrackDataHub.java

@@ -367,7 +367,7 @@ public class TrackDataHub {
                 // Also include the last point if the selected track is not recording.
                 if ((localNumLoadedTrackPoints % samplingFrequency == 0) || (trackPointId == lastTrackPointId && !isSelectedTrackRecording())) {
                     for (Listener trackDataListener : listeners) {
-                        trackDataListener.onSampledInTrackPoint(trackPoint, currentUpdater.getTrackStatistics(), currentUpdater.getSmoothedSpeed(), currentUpdater.getSmoothedAltitude());
+                        trackDataListener.onSampledInTrackPoint(trackPoint, currentUpdater.getTrackStatistics(), currentUpdater.getSmoothedSpeed());
                     }
                 } else {
                     for (Listener trackDataListener : listeners) {
@@ -432,7 +432,7 @@ public class TrackDataHub {
          *
          * @param trackPoint the trackPoint
          */
-        default void onSampledInTrackPoint(@NonNull TrackPoint trackPoint, @NonNull TrackStatistics trackStatistics, Speed smoothedSpeed, @Nullable Altitude smoothedAltitude_m) {
+        default void onSampledInTrackPoint(@NonNull TrackPoint trackPoint, @NonNull TrackStatistics trackStatistics, Speed smoothedSpeed) {
         }
 
         /**

src/main/java/de/dennisguse/opentracks/data/models/TrackPoint.java

@@ -46,7 +46,7 @@ public class TrackPoint {
     private Double longitude;
     private Distance horizontalAccuracy;
     private Distance verticalAccuracy;
-    private Altitude altitude;
+    private Altitude altitude; //TODO use Altitude.WGS84
     private Speed speed;
     private Float bearing;
     private Distance sensorDistance;

src/main/java/de/dennisguse/opentracks/stats/TrackStatisticsUpdater.java

@@ -208,14 +208,6 @@ public class TrackStatisticsUpdater {
         totalHeartRateDuration = Duration.ZERO;
     }
 
-    /**
-     * Gets the smoothed altitude over several readings.
-     * The altitude readings is noisy so the smoothed altitude is better than the raw altitude for many tasks.
-     */
-    public Altitude getSmoothedAltitude() {
-        return altitudeBuffer.getAverage();
-    }
-
     public Speed getSmoothedSpeed() {
         return speedBuffer.getAverage();
     }