229 lines
8.5 KiB
Dart
229 lines
8.5 KiB
Dart
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import 'package:flutter/material.dart';
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void main() {
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runApp(const MyApp());
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}
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class MyApp extends StatelessWidget {
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const MyApp({super.key});
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// This widget is the root of your application.
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@override
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Widget build(BuildContext context) {
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return MaterialApp(
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title: 'Flutter Demo',
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theme: ThemeData(
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// This is the theme of your application.
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//
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// Try running your application with "flutter run". You'll see the
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// application has a blue toolbar. Then, without quitting the app, try
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// changing the primarySwatch below to Colors.green and then invoke
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// "hot reload" (press "r" in the console where you ran "flutter run",
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// or simply save your changes to "hot reload" in a Flutter IDE).
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// Notice that the counter didn't reset back to zero; the application
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// is not restarted.
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primarySwatch: Colors.blue,
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),
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home: const MyHomePage(title: 'Flutter Demo Home Page'),
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);
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}
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}
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class MyHomePage extends StatefulWidget {
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const MyHomePage({super.key, required this.title});
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// This widget is the home page of your application. It is stateful, meaning
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// that it has a State object (defined below) that contains fields that affect
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// how it looks.
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// This class is the configuration for the state. It holds the values (in this
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// case the title) provided by the parent (in this case the App widget) and
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// used by the build method of the State. Fields in a Widget subclass are
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// always marked "final".
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final String title;
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@override
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State<MyHomePage> createState() => _MyHomePageState();
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}
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class _MyHomePageState extends State<MyHomePage> {
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final weightController = TextEditingController();
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final startHController = TextEditingController();
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final endHController = TextEditingController();
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final startVController = TextEditingController();
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final endVController = TextEditingController();
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final oCJoule = TextEditingController();
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final oCWater = TextEditingController();
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final oCIron = TextEditingController();
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void _calculate() {
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double energy;
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double ekin = 0;
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double epot = 0;
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if (weightController.text.isEmpty) {
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return;
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}
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if (!startHController.text.isEmpty && !endHController.text.isEmpty) {
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epot = _calculatePot(double.parse(weightController.text),
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double.parse(startHController.text), double.parse(endHController.text));
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}
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if (!startVController.text.isEmpty && !endVController.text.isEmpty) {
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ekin = _calculateKin(double.parse(weightController.text),
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double.parse(startVController.text), double.parse(endVController.text));
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}
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energy = ekin + epot;
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double water = energy / (80 * 4180); // 80 ist Differenz von 20 auf 100, 4180 sind Joule um 1l Wasser um 1 Grad zu erwärmen
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double iron = energy / (439 * 680); // 439 ist spezifische Wärmekapazität, 680 ist Differenz von 20 auf 700
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oCJoule.text = energy.toStringAsFixed(3) + " Joule Energie";
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oCWater.text = water.toStringAsFixed(3) + "l Wasser könnten damit zum Kochen gebracht werden";
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oCIron.text = iron.toStringAsFixed(3) + " kg Eisen können damit zum Glühen gebracht werden";
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}
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double _calculateKin(double weight, double startV, double endV) {
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return 0.5 * weight * (startV - endV).abs();
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}
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double _calculatePot(double weight, double startH, double endH) {
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double epot1 = weight * 9.81 * startH;
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double epot2 = weight * 9.81 * endH;
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return epot1 - epot2;
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}
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@override
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Widget build(BuildContext context) {
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// This method is rerun every time setState is called, for instance as done
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// by the _incrementCounter method above.
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//
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// The Flutter framework has been optimized to make rerunning build methods
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// fast, so that you can just rebuild anything that needs updating rather
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// than having to individually change instances of widgets.
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return Scaffold(
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appBar: AppBar(
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// Here we take the value from the MyHomePage object that was created by
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// the App.build method, and use it to set our appbar title.
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title: Text(widget.title),
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),
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body: Center(
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// Center is a layout widget. It takes a single child and positions it
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// in the middle of the parent.
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child: Column(
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// Column is also a layout widget. It takes a list of children and
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// arranges them vertically. By default, it sizes itself to fit its
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// children horizontally, and tries to be as tall as its parent.
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//
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// Invoke "debug painting" (press "p" in the console, choose the
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// "Toggle Debug Paint" action from the Flutter Inspector in Android
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// Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
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// to see the wireframe for each widget.
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//
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// Column has various properties to control how it sizes itself and
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// how it positions its children. Here we use mainAxisAlignment to
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// center the children vertically; the main axis here is the vertical
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// axis because Columns are vertical (the cross axis would be
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// horizontal).
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mainAxisAlignment: MainAxisAlignment.center,
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children: <Widget>[
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Title(
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color: Colors.black,
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title: "Test",
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child: Container(
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width: 1200,
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height: 200.0,
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decoration: BoxDecoration(
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border: Border.all(
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color: Colors.blue,
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),
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borderRadius: BorderRadius.all(
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Radius.circular(10.0),
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),
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),
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child: Center(
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child: Text(
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'Start und Ende von Höhe und/oder Geschwindigkeit angeben',
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style: TextStyle(fontSize: 28.0),
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),
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),
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)),
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TextField(
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decoration: InputDecoration(
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border: OutlineInputBorder(),
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labelText: "Gewicht",
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hintText: 'Gewicht in kg eingeben',
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),
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keyboardType: TextInputType.number,
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controller: weightController,
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),
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TextField(
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decoration: InputDecoration(
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border: OutlineInputBorder(),
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labelText: "Starthöhe",
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hintText: 'Starthöhe in m eingeben',
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),
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keyboardType: TextInputType.number,
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controller: startHController,
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),
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TextField(
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decoration: InputDecoration(
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border: OutlineInputBorder(),
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labelText: "Endhöhe",
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hintText: 'Endhöhe in m eingeben',
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),
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keyboardType: TextInputType.number,
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controller: endHController,
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),
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TextField(
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decoration: InputDecoration(
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border: OutlineInputBorder(),
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labelText: "Startgeschwindigkeit",
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hintText: 'Startgeschwindigkeit im m/s eingeben',
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),
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keyboardType: TextInputType.number,
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controller: startVController,
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),
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TextField(
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decoration: InputDecoration(
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border: OutlineInputBorder(),
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labelText: "Endgeschwindigkeit",
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hintText: 'Endgeschwindigkeit in m/s eingeben',
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),
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keyboardType: TextInputType.number,
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controller: endVController,
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),
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const SizedBox(height: 10),
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FloatingActionButton(
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onPressed: _calculate,
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tooltip: "Berechnen",
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child: const Icon(Icons.calculate)),
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TextField(
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showCursor: true,
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readOnly: true,
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controller: oCJoule,
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decoration: InputDecoration(
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labelText: "Gesamte Energie",
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),
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),
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TextField(
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showCursor: true,
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readOnly: true,
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controller: oCWater,
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decoration: InputDecoration(
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labelText: "Liter an Wasser zum Kochen",
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),
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),
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TextField(
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showCursor: true,
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readOnly: true,
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controller: oCIron,
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decoration: InputDecoration(
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labelText: "Kilogramm an Eisen zum Glühen",
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),
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),
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],
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),
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),
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);
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}
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}
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