fix: implemented accelerometer gain (fossasia#3357)

Author: Jashan32

lib/models/accelerometer_config.dart

@@ -3,15 +3,15 @@ class AccelerometerConfig {
   final int highLimit;
   final int lowLimit;
   final String activeSensor;
-  final int sensorGain;
+  final double sensorGain;
   final bool includeLocationData;
 
   const AccelerometerConfig({
     this.updatePeriod = 1000,
     this.highLimit = 200,
     this.lowLimit = 200,
     this.activeSensor = 'In-built Sensor',
-    this.sensorGain = 1,
+    this.sensorGain = 1.0,
     this.includeLocationData = true,
   });
 
@@ -20,7 +20,7 @@ class AccelerometerConfig {
     int? highLimit,
     int? lowLimit,
     String? activeSensor,
-    int? sensorGain,
+    double? sensorGain,
     bool? includeLocationData,
   }) {
     return AccelerometerConfig(
@@ -50,7 +50,7 @@ class AccelerometerConfig {
       highLimit: json['highLimit'] ?? 200,
       lowLimit: json['lowLimit'] ?? json['depthLimit'] ?? 200,
       activeSensor: json['activeSensor'] ?? 'In-built Sensor',
-      sensorGain: json['sensorGain'] ?? 1,
+      sensorGain: json['sensorGain'] ?? 1.0,
       includeLocationData: json['includeLocationData'] ?? true,
     );
   }

lib/providers/accelerometer_config_provider.dart

@@ -58,7 +58,7 @@ class AccelerometerConfigProvider extends ChangeNotifier {
     _saveConfigToPrefs();
   }
 
-  void updateSensorGain(int sensorGain) {
+  void updateSensorGain(double sensorGain) {
     _config = _config.copyWith(sensorGain: sensorGain);
     notifyListeners();
     _saveConfigToPrefs();

lib/providers/accelerometer_state_provider.dart

@@ -214,21 +214,21 @@ class AccelerometerStateProvider extends ChangeNotifier {
   void _updateData() {
     final highLimit = _currentHighLimit;
     final lowLimit = _currentLowLimit;
-
+    final gain = (_configProvider?.config.sensorGain ?? 1.0).toDouble();
     final bool shouldClip = !_isPlayingBack;
 
     final double x;
     final double y;
     final double z;
 
     if (shouldClip && highLimit != null && lowLimit != null) {
-      x = _accelerometerEvent.x.clamp(-lowLimit, highLimit).toDouble();
-      y = _accelerometerEvent.y.clamp(-lowLimit, highLimit).toDouble();
-      z = _accelerometerEvent.z.clamp(-lowLimit, highLimit).toDouble();
+      x = (_accelerometerEvent.x * gain).clamp(-lowLimit, highLimit).toDouble();
+      y = (_accelerometerEvent.y * gain).clamp(-lowLimit, highLimit).toDouble();
+      z = (_accelerometerEvent.z * gain).clamp(-lowLimit, highLimit).toDouble();
     } else {
-      x = _accelerometerEvent.x;
-      y = _accelerometerEvent.y;
-      z = _accelerometerEvent.z;
+      x = _accelerometerEvent.x * gain;
+      y = _accelerometerEvent.y * gain;
+      z = _accelerometerEvent.z * gain;
     }
 
     _accelerometerEvent = AccelerometerEvent(x, y, z, DateTime.now());

lib/view/accelerometer_config_screen.dart

@@ -185,9 +185,20 @@ class _AccelerometerConfigScreenState extends State<AccelerometerConfigScreen> {
                       value: provider.config.sensorGain.toString(),
                       controller: _sensorGainController,
                       onChanged: (value) {
-                        final intValue = int.tryParse(value);
-                        if (intValue != null) {
-                          provider.updateSensorGain(intValue);
+                        final doubleValue = double.tryParse(value);
+                        if (doubleValue != null &&
+                            doubleValue >= 0 &&
+                            doubleValue <= 100) {
+                          provider.updateSensorGain(doubleValue);
+                        } else {
+                          ScaffoldMessenger.of(context).showSnackBar(
+                            SnackBar(
+                                content: Text(
+                                  appLocalizations.sensorGainErrorMessage,
+                                  style: TextStyle(color: snackBarContentColor),
+                                ),
+                                backgroundColor: snackBarBackgroundColor),
+                          );
                         }
                       },
                       hint: appLocalizations.sensorGainHint,