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| import 'dart:async'; | ||
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| import 'package:flutter/material.dart'; | ||
| import 'package:flutter/services.dart'; | ||
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| class MyHomePage extends StatefulWidget { | ||
| const MyHomePage({Key? key, required this.title}) : super(key: key); | ||
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| // This widget is the home page of your application. It is stateful, meaning | ||
| // that it has a State object (defined below) that contains fields that affect | ||
| // how it looks. | ||
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| // This class is the configuration for the state. It holds the values (in this | ||
| // case the title) provided by the parent (in this case the App widget) and | ||
| // used by the build method of the State. Fields in a Widget subclass are | ||
| // always marked "final". | ||
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| final String title; | ||
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| @override | ||
| State<MyHomePage> createState() => MyHomePageState(); | ||
| } | ||
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| class MyHomePageState extends State<MyHomePage> { | ||
| static const methodChannel = MethodChannel('com.huigong.headmotion/method'); | ||
| static const attitudeChannel = | ||
| EventChannel('com.huigong.headmotion/attitude'); | ||
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| 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; | ||
| late StreamSubscription attitudeSubscription; | ||
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| Future<void> _checkAvailability() async { | ||
| try { | ||
| var available = await methodChannel.invokeMethod('isSensorAvailable'); | ||
| setState(() { | ||
| _sensorAvailable = available.toString(); | ||
| }); | ||
| } on PlatformException catch (e) { | ||
| debugPrint(e.toString()); | ||
| } | ||
| } | ||
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| _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"]; | ||
| }); | ||
| if (_currentMotionType != _lastMotionType && | ||
| _currentMotionType != "still") { | ||
| // ignore: todo | ||
| //todo: handle motion event | ||
| debugPrint("$_currentMotionType once"); | ||
| } | ||
| _updateMotionType(); | ||
| }); | ||
| } | ||
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| _updateMotionType() { | ||
| _lastMotionType = _currentMotionType; | ||
| } | ||
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| double _max(Map attitudeMap) { | ||
| double pitch = attitudeMap["pitch"]; | ||
| double roll = attitudeMap["roll"]; | ||
| double yaw = attitudeMap["yaw"]; | ||
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| 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; | ||
| } | ||
| } | ||
| } | ||
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| String _getMotionType(Map attitudeMap) { | ||
| double? pitch = attitudeMap["pitch"]; | ||
| double? roll = attitudeMap["roll"]; | ||
| double? yaw = attitudeMap["yaw"]; | ||
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| double maxValue = _max(attitudeMap); | ||
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| if (maxValue.abs() < 0.5) { | ||
| return "still"; | ||
| } | ||
| if (maxValue == roll) { | ||
| if (maxValue.isNegative) { | ||
| return "tilt left"; | ||
| } else { | ||
| return "tilt right"; | ||
| } | ||
| } | ||
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| if (maxValue == pitch) { | ||
| if (maxValue.isNegative) { | ||
| return "tilt forward"; | ||
| } else { | ||
| return "tilt backward"; | ||
| } | ||
| } | ||
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| if (maxValue == yaw) { | ||
| if (maxValue.isNegative) { | ||
| return "look right"; | ||
| } else { | ||
| return "look left"; | ||
| } | ||
| } | ||
| return "still"; | ||
| } | ||
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| _stopReading() { | ||
| setState(() { | ||
| _attitudePitchReading = 0; | ||
| _attitudeRollReading = 0; | ||
| _attitudeYawReading = 0; | ||
| }); | ||
| attitudeSubscription.cancel(); | ||
| } | ||
|
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| @override | ||
| Widget build(BuildContext context) { | ||
| return Scaffold( | ||
| appBar: AppBar( | ||
| // Here we take the value from the MyHomePage object that was created by | ||
| // the App.build method, and use it to set our appbar title. | ||
| title: Text(widget.title), | ||
| ), | ||
| body: Align( | ||
| alignment: Alignment.center, | ||
| child: Column( | ||
| mainAxisAlignment: MainAxisAlignment.center, | ||
| children: [ | ||
| Text('Device supported? : $_sensorAvailable'), | ||
| ElevatedButton( | ||
| onPressed: () => _checkAvailability(), | ||
| child: const Text('Check Device Supported')), | ||
| const SizedBox( | ||
| height: 50.0, | ||
| ), | ||
| if (_attitudeRollReading != 0 || | ||
| _attitudePitchReading != 0 || | ||
| _attitudeYawReading != 0) | ||
| Text(''' | ||
| Pitch: $_attitudePitchReading | ||
| Roll: $_attitudeRollReading | ||
| Yaw: $_attitudeYawReading | ||
| type: $_currentMotionType | ||
| '''), | ||
| if (_sensorAvailable == 'true' && | ||
| _attitudeRollReading == 0 && | ||
| _attitudePitchReading == 0 && | ||
| _attitudeYawReading == 0) | ||
| ElevatedButton( | ||
| onPressed: () => _startReading(), | ||
| child: const Text('Start Reading')), | ||
| if (_attitudeRollReading != 0 || | ||
| _attitudePitchReading != 0 || | ||
| _attitudeYawReading != 0) | ||
| ElevatedButton( | ||
| onPressed: () => _stopReading(), | ||
| child: const Text('Stop Reading')), | ||
| ], | ||
| )), | ||
| ); | ||
| } | ||
| } |
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