cpd_2022_energy/lib/main.dart

import 'package:flutter/material.dart';

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: 'Flutter Demo',
      theme: ThemeData(

        primarySwatch: Colors.blue,
      ),
      home:  MyHomePage(title: 'Energiebillanz Rechner'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});


  final String title;
  @override
  State<MyHomePage> createState() => _MyHomePageState();
  }


class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;
  double _joul=0;
  double _energieWasser=0;
  double _energieEisen=0;
  double _aHohe=0;
  double _eHohe=0;
  double _aGeschwindigkeit=0;
  double _eGeschwindigkeit=0;
  double _gewicht=0;
  final myController = TextEditingController();
  final controllerAnfangsgeschwindigkeit = TextEditingController();
  final controllerEndgeschwindigkeit = TextEditingController();
  final controllerAnfangshohe = TextEditingController();
  final controllerEndhohe = TextEditingController();
  final controllerGewicht = TextEditingController();
  @override
  void dispose() {
    // Clean up the controller when the widget is disposed.
    myController.dispose();
    super.dispose(); }
  void _incrementCounter() {
    setState(() {


      _counter++;
    });
  }
  void _getErgebnis() {
    setState(() {
       _aHohe=double.parse(controllerAnfangshohe.text);
       _eHohe=double.parse(controllerEndhohe.text);
       _aGeschwindigkeit=double.parse(controllerAnfangsgeschwindigkeit.text);
       _eGeschwindigkeit=double.parse(controllerEndgeschwindigkeit.text);
       _gewicht=double.parse(controllerGewicht.text);
      _joul= (((_gewicht * 9.8 * _aHohe) + ((_gewicht * (_aGeschwindigkeit * _aGeschwindigkeit)) / 2)) - ((_gewicht * 9.8 * _eHohe) + ((_gewicht * (_eGeschwindigkeit * _eGeschwindigkeit)) / 2)));
       _energieWasser = (_joul / (4186 * 80));
       _energieEisen = (_joul / (500 * 680));
    });
  }
  @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: Center(

        child: Column(

          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            TextField(
              controller: controllerAnfangsgeschwindigkeit,
             // int a= myController.Integer.parseInt(),
              decoration: InputDecoration(
                border: OutlineInputBorder(),
                hintText: 'Anfangsgeschwindigkeit',
              ),
            ),
          TextField(
            controller: controllerEndgeschwindigkeit,
            decoration: InputDecoration(
              border: OutlineInputBorder(),
              hintText: 'Endgeschwindigkeit',
            ),
          ),
            TextField(
              controller: controllerAnfangshohe,
              decoration: InputDecoration(
                border: OutlineInputBorder(),
                hintText: 'Anfangshöhe',
              ),
            ),
            TextField(
              controller: controllerEndhohe,
              decoration: InputDecoration(
                border: OutlineInputBorder(),
                hintText: 'Endhöhe',
              ),
            ),
            TextField(
              controller: controllerGewicht,
              decoration: InputDecoration(
                border: OutlineInputBorder(),
                hintText: 'Gewicht des Objekts',
              ),
            ),
            TextButton(
              style: ButtonStyle(
                foregroundColor: MaterialStateProperty.all<Color>(Colors.blue),
              ),
              onPressed: _getErgebnis,
              child: Text('berechnen'),
            ),
             Text(
              'Ergebnis in Joul $_joul',

            ),
            Text(
              'Ergebnis in Liter Wasser zum Kochen zubringen= $_energieWasser',

            ),
            Text(
              'Ergebnis in Kg Eisen zum Glühen zubringen= $_energieEisen',

            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}