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Yugesh-Kumar-SYugesh-Kumar-S
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implementation of the Compass page
1 parent 8fbccb5 commit 896fb86

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8 files changed

+383
-2
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8 files changed

+383
-2
lines changed

‎android/app/src/main/AndroidManifest.xml

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@@ -36,6 +36,7 @@
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<meta-data
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android:name="flutterEmbedding"
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android:value="2" />
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</application>
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<!-- Required to query activities that can process text, see:
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https://developer.android.com/training/package-visibility and

‎assets/icons/compass_icon.png

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‎lib/main.dart

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@@ -1,6 +1,7 @@
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import 'package:flutter/material.dart';
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import 'package:provider/provider.dart';
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import 'package:pslab/providers/board_state_provider.dart';
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import 'package:pslab/providers/compass_provider.dart';
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import 'package:pslab/providers/locator.dart';
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import 'package:pslab/view/connect_device_screen.dart';
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import 'package:pslab/view/faq_screen.dart';
@@ -9,7 +10,7 @@ import 'package:pslab/view/oscilloscope_screen.dart';
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import 'package:pslab/view/settings_screen.dart';
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import 'package:pslab/view/about_us_screen.dart';
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import 'package:pslab/view/software_licenses_screen.dart';
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import 'package:pslab/view/compass_screen.dart';
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import 'constants.dart';
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void main() {
@@ -22,6 +23,9 @@ void main() {
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ChangeNotifierProvider<BoardStateProvider>(
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create: (context) => getIt<BoardStateProvider>(),
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),
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ChangeNotifierProvider<CompassProvider>(
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create: (context) => getIt<CompassProvider>(),
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),
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],
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child: const MyApp(),
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),
@@ -44,6 +48,7 @@ class MyApp extends StatelessWidget {
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routes: {
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'/': (context) => const InstrumentsScreen(),
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'/oscilloscope': (context) => const OscilloscopeScreen(),
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'/compass': (context) => const CompassScreen(),
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'/connectDevice': (context) => const ConnectDeviceScreen(),
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'/faq': (context) => const FAQScreen(),
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'/settings': (context) => const SettingsScreen(),

‎lib/providers/compass_provider.dart

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import 'dart:async';
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import 'dart:math';
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import 'package:flutter/material.dart';
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import 'package:sensors_plus/sensors_plus.dart';
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import 'package:flutter/foundation.dart';
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class CompassProvider extends ChangeNotifier {
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MagnetometerEvent _magnetometerEvent =
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MagnetometerEvent(0, 0, 0, DateTime.now());
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AccelerometerEvent _accelerometerEvent =
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AccelerometerEvent(0, 0, 0, DateTime.now());
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StreamSubscription? _magnetometerSubscription;
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StreamSubscription? _accelerometerSubscription;
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String _selectedAxis = 'X';
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double _currentDegree = 0.0;
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int _direction = 0;
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double _smoothedHeading = 0.0;
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MagnetometerEvent get magnetometerEvent => _magnetometerEvent;
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AccelerometerEvent get accelerometerEvent => _accelerometerEvent;
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String get selectedAxis => _selectedAxis;
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double get currentDegree => _currentDegree;
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int get direction => _direction;
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double get smoothedHeading => _smoothedHeading;
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void initializeSensors() {
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_magnetometerSubscription = magnetometerEventStream().listen(
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(event) {
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_magnetometerEvent = event;
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_updateCompassDirection();
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notifyListeners();
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},
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onError: (error) {
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debugPrint("Magnetometer error: $error");
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},
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cancelOnError: true,
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);
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_accelerometerSubscription = accelerometerEventStream().listen(
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(event) {
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_accelerometerEvent = event;
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_updateCompassDirection();
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notifyListeners();
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},
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onError: (error) {
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debugPrint("Accelerometer error: $error");
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},
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cancelOnError: true,
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);
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}
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void disposeSensors() {
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_magnetometerSubscription?.cancel();
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_accelerometerSubscription?.cancel();
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}
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@override
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void dispose() {
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disposeSensors();
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super.dispose();
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}
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void _updateCompassDirection() {
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double radians = _getRadiansForAxis(_selectedAxis);
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double degrees = radians * (180 / pi);
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if (degrees < 0) {
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degrees += 360;
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}
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degrees = (degrees - 90) % 360;
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if (degrees < 0) {
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degrees += 360;
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}
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const double alpha = 0.45;
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double angleDiff = degrees - _smoothedHeading;
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if (angleDiff > 180) {
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angleDiff -= 360;
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} else if (angleDiff < -180) {
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angleDiff += 360;
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}
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_smoothedHeading = _smoothedHeading + alpha * angleDiff;
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if (_smoothedHeading >= 360) {
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_smoothedHeading -= 360;
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} else if (_smoothedHeading < 0) {
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_smoothedHeading += 360;
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}
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switch (_selectedAxis) {
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case 'X':
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_currentDegree = -(_smoothedHeading * pi / 180);
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break;
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case 'Y':
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_currentDegree = ((_smoothedHeading - 10) * pi / 180);
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break;
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case 'Z':
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_currentDegree = -((_smoothedHeading + 90) * pi / 180);
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break;
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}
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}
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double _getRadiansForAxis(String axis) {
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double ax = _accelerometerEvent.x;
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double ay = _accelerometerEvent.y;
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double az = _accelerometerEvent.z;
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double mx = _magnetometerEvent.x;
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double my = _magnetometerEvent.y;
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double mz = _magnetometerEvent.z;
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double pitch = atan2(ay, sqrt(ax * ax + az * az));
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double roll = atan2(-ax, az);
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double xH = mx * cos(pitch) + mz * sin(pitch);
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double yH = mx * sin(roll) * sin(pitch) +
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my * cos(roll) -
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mz * sin(roll) * cos(pitch);
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double zH = -mx * cos(roll) * sin(pitch) +
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my * sin(roll) +
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mz * cos(roll) * cos(pitch);
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switch (axis) {
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case 'X':
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return atan2(yH, xH);
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case 'Y':
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return atan2(-xH, zH);
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case 'Z':
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return atan2(yH, -zH);
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default:
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return atan2(yH, xH);
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}
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}
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double getDegreeForAxis(String axis) {
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double radians = _getRadiansForAxis(axis);
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double degree = radians * (180 / pi);
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switch (axis) {
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case 'X':
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degree = (degree - 90) % 360;
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break;
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case 'Y':
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degree = (-degree + 100) % 360;
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break;
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case 'Z':
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degree = (degree + 90) % 360;
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break;
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}
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return degree < 0 ? degree + 360 : degree;
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}
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void onAxisSelected(String axis) {
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_selectedAxis = axis;
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switch (axis) {
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case 'X':
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_direction = 0;
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break;
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case 'Y':
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_direction = 1;
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break;
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case 'Z':
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_direction = 2;
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break;
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}
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notifyListeners();
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}
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}

‎lib/providers/locator.dart

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@@ -7,6 +7,7 @@ import 'package:pslab/communication/handler/ios_comms_handler.dart';
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import 'package:pslab/communication/science_lab.dart';
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import 'package:pslab/others/science_lab_common.dart';
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import 'package:pslab/providers/board_state_provider.dart';
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import 'package:pslab/providers/compass_provider.dart';
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final GetIt getIt = GetIt.instance;
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@@ -23,4 +24,5 @@ void setupLocator() {
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getIt.registerLazySingleton<ScienceLab>(
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() => getIt.get<ScienceLabCommon>().getScienceLab());
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getIt.registerLazySingleton<BoardStateProvider>(() => BoardStateProvider());
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getIt.registerLazySingleton<CompassProvider>(() => CompassProvider());
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}

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