diff options
| author | Mica White <botahamec@outlook.com> | 2025-12-08 20:12:09 -0500 |
|---|---|---|
| committer | Mica White <botahamec@outlook.com> | 2025-12-08 20:12:09 -0500 |
| commit | 7c8b5676fecffe5468810b703c579acb6a5fd256 (patch) | |
| tree | 0c4ff107dfd012a4d03500f41f3607aff1d52616 /lib | |
First commit
Diffstat (limited to 'lib')
| -rwxr-xr-x | lib/main.dart | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/lib/main.dart b/lib/main.dart new file mode 100755 index 0000000..cf8e184 --- /dev/null +++ b/lib/main.dart @@ -0,0 +1,130 @@ +import 'dart:async';
+
+import 'package:flutter/material.dart';
+import 'package:geolocator/geolocator.dart';
+
+enum SpeedUnit { milesPerHour, kilometersPerHour }
+
+extension on SpeedUnit {
+ double fromMetersPerSecond(double metersPerSecond) => switch (this) {
+ SpeedUnit.kilometersPerHour => metersPerSecond * 3.6,
+ SpeedUnit.milesPerHour => metersPerSecond * 2.236936,
+ };
+
+ get acronym => switch (this) {
+ SpeedUnit.kilometersPerHour => 'kmph',
+ SpeedUnit.milesPerHour => 'mph',
+ };
+}
+
+void main() {
+ runApp(const MyApp());
+}
+
+class MyApp extends StatelessWidget {
+ const MyApp({super.key});
+
+ // This widget is the root of your application.
+ @override
+ Widget build(BuildContext context) {
+ return MaterialApp(
+ title: 'Speedometer',
+ theme: ThemeData(
+ colorScheme: ColorScheme.fromSeed(seedColor: Colors.red),
+ ),
+ darkTheme: ThemeData(
+ colorScheme: ColorScheme.fromSeed(
+ seedColor: Colors.red,
+ brightness: Brightness.dark,
+ ),
+ ),
+ home: const MyHomePage(title: 'Speedometer'),
+ );
+ }
+}
+
+class MyHomePage extends StatefulWidget {
+ const MyHomePage({super.key, required this.title});
+
+ // 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.
+
+ // 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".
+
+ final String title;
+
+ @override
+ State<MyHomePage> createState() => _MyHomePageState();
+}
+
+class _MyHomePageState extends State<MyHomePage> {
+ StreamSubscription<Position>? _positionStream;
+ double _speed = 0.0;
+ double _speedAccuracy = 0.0;
+ SpeedUnit _speedUnit = SpeedUnit.milesPerHour;
+ LocationSettings _locationSettings = LocationSettings();
+
+ @override
+ void initState() {
+ super.initState();
+ _positionStream =
+ Geolocator.getPositionStream(
+ locationSettings: _locationSettings,
+ ).listen((Position? position) {
+ if (position != null) {
+ _speed = position.speed;
+ _speedAccuracy = position.speedAccuracy;
+ }
+ });
+ }
+
+ @override
+ void dispose() {
+ super.dispose();
+ _positionStream?.cancel();
+ }
+
+ @override
+ Widget build(BuildContext context) {
+ // This method is rerun every time setState is called, for instance as done
+ // by the _incrementCounter method above.
+ //
+ // The Flutter framework has been optimized to make rerunning build methods
+ // fast, so that you can just rebuild anything that needs updating rather
+ // than having to individually change instances of widgets.
+ return Scaffold(
+ appBar: AppBar(
+ // TRY THIS: Try changing the color here to a specific color (to
+ // Colors.amber, perhaps?) and trigger a hot reload to see the AppBar
+ // change color while the other colors stay the same.
+ backgroundColor: Theme.of(context).colorScheme.inversePrimary,
+ // 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: Center(
+ // Center is a layout widget. It takes a single child and positions it
+ // in the middle of the parent.
+ child: Column(
+ mainAxisAlignment: MainAxisAlignment.center,
+ crossAxisAlignment: CrossAxisAlignment.center,
+ children: [
+ Flex(direction: Axis.horizontal),
+ Text(
+ '${_speedUnit.fromMetersPerSecond(_speed)} ${_speedUnit.acronym}',
+ style: Theme.of(context).textTheme.displayLarge,
+ ),
+ Text(
+ '± ${_speedUnit.fromMetersPerSecond(_speedAccuracy)} ${_speedUnit.acronym}',
+ style: Theme.of(context).textTheme.displaySmall,
+ ),
+ ],
+ ),
+ ),
+ );
+ }
+}
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