detect motion type based on attitude data

lib/main.dart

@@ -56,6 +56,9 @@ class _MyHomePageState extends State<MyHomePage> {
  EventChannel('com.huigong.headmotion/attitude');
 
  String _sensorAvailable = "Unknown";
+ Map _currentAttitude = {"pitch": 0.0, "roll": 0.0, "yaw": 0.0};
+ String _lastMotionType = "still";
+ String _currentMotionType = "still";
  double _attitudePitchReading = 0;
  double _attitudeRollReading = 0;
  double _attitudeYawReading = 0;
@@ -68,21 +71,87 @@ class _MyHomePageState extends State<MyHomePage> {
  _sensorAvailable = available.toString();
  });
  } on PlatformException catch (e) {
- print(e);
+ debugPrint(e.toString());
  }
  }
 
  _startReading() {
  attitudeSubscription =
  attitudeChannel.receiveBroadcastStream().listen((event) {
  setState(() {
+ _currentAttitude = {
+ "pitch": event["pitch"],
+ "roll": event["roll"],
+ "yaw": event["yaw"]
+ };
+ _currentMotionType = _getMotionType(_currentAttitude);
  _attitudePitchReading = event["pitch"];
  _attitudeRollReading = event["roll"];
  _attitudeYawReading = event["yaw"];
  });
  });
  }
 
+ // _updateMotionType() {
+ // _lastMotionType = _currentMotionType;
+ // }
+
+ double _max(Map attitudeMap) {
+ double pitch = attitudeMap["pitch"];
+ double roll = attitudeMap["roll"];
+ double yaw = attitudeMap["yaw"];
+
+ if (pitch.abs() >= roll.abs()) {
+ if (pitch.abs() >= yaw.abs()) {
+ return pitch;
+ } else {
+ return yaw;
+ }
+ } else {
+ if (roll.abs() >= yaw.abs()) {
+ return roll;
+ } else {
+ return yaw;
+ }
+ }
+ }
+
+ String _getMotionType(Map attitudeMap) {
+ double? pitch = attitudeMap["pitch"];
+ double? roll = attitudeMap["roll"];
+ double? yaw = attitudeMap["yaw"];
+
+ double maxValue = _max(attitudeMap);
+
+ if (maxValue.abs() < 0.5) {
+ return "still";
+ }
+ if (maxValue == roll) {
+ if (maxValue.isNegative) {
+ return "tilt left";
+ } else {
+ return "tilt right";
+ }
+ }
+
+ if (maxValue == pitch) {
+ if (maxValue.isNegative) {
+ return "tilt forward";
+ } else {
+ return "tilt backward";
+ }
+ }
+
+ if (maxValue == yaw) {
+ if (maxValue.isNegative) {
+ return "look right";
+ } else {
+ return "look left";
+ }
+ }
+ return "still";
+ }
+
  _stopReading() {
  setState(() {
  _attitudePitchReading = 0;
@@ -119,7 +188,11 @@ class _MyHomePageState extends State<MyHomePage> {
  Pitch: $_attitudePitchReading 
  Roll: $_attitudeRollReading 
  Yaw: $_attitudeYawReading
+ type: $_currentMotionType
  '''),
+ if (_currentMotionType != _lastMotionType &&
+ _currentMotionType != "still")
+ Text("motion type: $_currentMotionType"),
  if (_sensorAvailable == 'true' &&
  _attitudeRollReading == 0 &&
  _attitudePitchReading == 0 &&