需要帮助修复我的Dart代码中的设备方向跟踪问题。

import 'dart:async';
import 'dart:math' as math;
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:flutter_rotation_sensor/flutter_rotation_sensor.dart';
import '../models/arena_models.dart';

class MotionState {
  final double currentYaw;
  final double currentPitch;
  final String? lockedTargetId;
  final double rawYaw;
  final double calibrationOffset;

  const MotionState({
    required this.currentYaw,
    required this.currentPitch,
    this.lockedTargetId,
    required this.rawYaw,
    required this.calibrationOffset,
  });

  MotionState copyWith({
    double? currentYaw,
    double? currentPitch,
    String? lockedTargetId,
    double? rawYaw,
    double? calibrationOffset,
  }) {
    return MotionState(
      currentYaw: currentYaw ?? this.currentYaw,
      currentPitch: currentPitch ?? this.currentPitch,
      lockedTargetId: lockedTargetId ?? this.lockedTargetId,
      rawYaw: rawYaw ?? this.rawYaw,
      calibrationOffset: calibrationOffset ?? this.calibrationOffset,
    );
  }
}

class UserMotionNotifier extends StateNotifier<MotionState> {
  final List<PeerNode> activeNodes;
  StreamSubscription? _orientationSub;
  double _filteredYaw = 0.0;
  double _filteredPitch = 90.0;
  double _calibrationOffset = 0.0;
  final List<double> _yawBuffer = [];
  final List<double> _pitchBuffer = [];
  static const int _bufferSize = 15;
  DateTime? _lastGyroTime;
  bool _isFirstReading = true;
  double _lastW = 1.0;
  double _lastX = 0.0;
  double _lastY = 0.0;
  double _lastZ = 0.0;

  UserMotionNotifier(this.activeNodes)
      : super(const MotionState(
          currentYaw: 0.0,
          currentPitch: 90.0,
          rawYaw: 0.0,
          calibrationOffset: 0.0,
        ));

  void startTracking() {
    RotationSensor.samplingPeriod = SensorInterval.fastestInterval;
    RotationSensor.referenceFrame = ReferenceFrame.arbitrary;
    RotationSensor.coordinateSystem = CoordinateSystem.transformed(Axis3.X, Axis3.Y);
    _orientationSub = RotationSensor.orientationStream.listen((event) {
      final q = event.quaternion;
      double targetW = q.w;
      double targetX = -q.x;
      double targetY = q.y;
      double targetZ = -q.z;
      if (targetW < 0.0) {
        targetW = -targetW;
        targetX = -targetX;
        targetY = -targetY;
        targetZ = -targetZ;
      }
      double sinyCosp = 2.0 * (targetW * targetZ + targetX * targetY);
      double cosyCosp = 1.0 - 2.0 * (targetY * targetY + targetZ * targetZ);
      double rawAzimuthRad = math.atan2(sinyCosp, cosyCosp);
      double rawAzimuthDeg = rawAzimuthRad * 180.0 / math.pi;
      if (rawAzimuthDeg < 0) rawAzimuthDeg += 360.0;
      double sinp = 2.0 * (targetW * targetY - targetZ * targetX);
      double rawPitchRad = sinp.abs() >= 1.0
          ? (sinp.sign * math.pi / 2.0)
          : math.asin(sinp);
      double rawPitchDeg = 90.0 + (rawPitchRad * 180.0 / math.pi);
      rawPitchDeg = rawPitchDeg.clamp(90.0, 180.0);
      if (_isFirstReading) {
        _calibrationOffset = rawAzimuthDeg;
        _filteredYaw = 0.0;
        _filteredPitch = rawPitchDeg;
        _isFirstReading = false;
      }
      _updateFilters(rawAzimuthDeg, rawPitchDeg);
    });
  }

  void _updateFilters(double newYaw, double newPitch) {
    double yawDiff = newYaw - _filteredYaw;
    if (yawDiff > 180) newYaw -= 360;
    if (yawDiff < -180) newYaw += 360;
    _filteredYaw = (0.95 * _filteredYaw + 0.05 * newYaw) % 360.0;
    if (_filteredYaw < 0) _filteredYaw += 360.0;
    _filteredPitch = 0.95 * _filteredPitch + 0.05 * newPitch;
    _yawBuffer.add(_filteredYaw);
    _pitchBuffer.add(_filteredPitch);
    if (_yawBuffer.length > _bufferSize) _yawBuffer.removeAt(0);
    if (_pitchBuffer.length > _bufferSize) _pitchBuffer.removeAt(0);
    double smoothedYaw = _yawBuffer.reduce((a, b) => a + b) / _yawBuffer.length;
    double smoothedPitch = _pitchBuffer.reduce((a, b) => a + b) / _pitchBuffer.length;
    double finalYaw = (smoothedYaw - _calibrationOffset) % 360.0;
    if (finalYaw < 0) finalYaw += 360.0;
    String? lockedId;
    for (var node in activeNodes) {
      double targetAngleDeg = node.azimuthAngleRad * 180.0 / math.pi;
      double angleDiff = (finalYaw - targetAngleDeg).abs();
      double normDiff = angleDiff % 360.0;
      if (normDiff > 180.0) {
        normDiff = 360.0 - normDiff;
      }
      double distance = node.scaledDistanceMeters;
      double dynamicTolerance = math.max(2.5, math.atan(0.6 / distance) * 180.0 / math.pi);
      if (normDiff <= dynamicTolerance) {
        lockedId = node.id;
        break;
      }
    }
    state = MotionState(
      currentYaw: finalYaw,
      currentPitch: smoothedPitch,
      lockedTargetId: lockedId,
      rawYaw: _filteredYaw,
      calibrationOffset: _calibrationOffset,
    );
  }

  void recalibrate(double targetAngleDegrees) {
    _calibrationOffset = (_filteredYaw - targetAngleDegrees) % 360.0;
    if (_calibrationOffset < 0) _calibrationOffset += 360.0;
  }

  void autoAlignOnHit(String targetId) {
    final node = activeNodes.firstWhere((n) => n.id == targetId);
    double targetAngleDeg = node.azimuthAngleRad * 180.0 / math.pi;
    recalibrate(targetAngleDeg);
  }

  void dispose() {
    _orientationSub?.cancel();
    super.dispose();
  }
}

final motionProvider = StateNotifierProvider.family<UserMotionNotifier, MotionState, List<PeerNode>>((ref, nodes) {
  return UserMotionNotifier(nodes);
});

翻译说明：上述 Dart 代码已翻译为简体中文。