arctano_eval/lib/main.dart

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'num_format.dart';
import 'dart:math';
import 'dart:async';

void main() {
  runApp(const MaterialApp(
    home: Home(),
    debugShowCheckedModeBanner: false,
  ));
}

double truncateToDecimalPlaces(num value, int fractionalDigits) => (value * pow(10,
    fractionalDigits)).truncate() / pow(10, fractionalDigits);

class Home extends StatefulWidget {
  const Home({Key? key}) : super(key: key);

  @override
  State<Home> createState() => _HomeState();
}

class _HomeState extends State<Home> {
  int _num = 94;
  String _status = "Not yet started";
  int _timer = 60;
  double _txt = 0.0;
  double rng1 = 0.0, rng2 = 0.0, res1 = 0.0, res2 = 0.0;
  bool match = false;
  var r1 = Random();
  var r2 = Random();

  Timer? t, t2, t3;

  void cancelTimers() {
    setState(() {
      t?.cancel();
      t2?.cancel();
      t3?.cancel();
    });
  }

  void btnPress() async {
    cancelTimers();
    setState(() {
      _timer = 60;
      rng1 = 0.0;
      res1 = 0.0;
      rng2 = 0.0;
      res2 = 0.0;
    });

    setState(() {
      process();
      t = Timer.periodic(const Duration(seconds: 1), (timer) {
        setState(() {
          _status = "Processing";
        });

        setState(() {
          res2 = _txt + _num;
        });


        if (match) {
          setState(() {
            _status = "Match found";
            rng1 = res1;
            cancelTimers();
          });
        }

        if (_timer <= 0) {
          if (!match) {
            setState(() {
              _status = "No match";
            });
          }
          cancelTimers();
        }
        setState(() {
          _timer -= 1;
        });
      });
    });
  }

  void process() async {
    t2 = Timer.periodic(const Duration(milliseconds: 100), (timer) {
      setState(() {
        rng1 = truncateToDecimalPlaces(r1.nextDouble(), 2);
        setState(() {
          res1 = rng1 + rng2;
        });
        if (res1 == res2) {
          setState(() {
            match = true;
            cancelTimers();
          });
        }
      });
    });

    if (_num == 94) {
      setState(() {
        rng2 = 80 + r2.nextInt((20)).toDouble();
      });
    } else {
      setState(() {
        rng2 = 100 + r2.nextInt((20)).toDouble();
      });
    }

    t3 = Timer.periodic(const Duration(seconds: 3), (timer) {
      if (_num == 94) {
        setState(() {
          rng2 = 80 + r2.nextInt((20)).toDouble();
        });
      } else {
        setState(() {
          rng2 = 100 + r2.nextInt((20)).toDouble();
        });
      }
    });

  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('ArcVal'),
        centerTitle: true,
      ),
      body: Container(
        padding: const EdgeInsets.symmetric(horizontal: 30.0, vertical: 20.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: <Widget>[
            Center(child:
            Text(
                'Status: $_status',
              style: const TextStyle(
                fontSize: 20.0,
                fontWeight: FontWeight.bold,
              ),
            )
            ),
            const SizedBox(height: 30),
            const Text(
              'Choose a number:',
              style: TextStyle(
                fontSize: 18.0,
              ),
            ),
            Row(
              mainAxisSize: MainAxisSize.min,
              children: <Widget>[
                Expanded(
                  child: RadioListTile<int>(
                    title: const Text('94'),
                    value: 94,
                    groupValue: _num,
                    onChanged: (v) {
                      setState(() {
                        _num = v!;
                      });
                    },
                  ),
                ),
                Expanded(
                  child: RadioListTile<int>(
                    title: const Text('114'),
                    value: 114,
                    groupValue: _num,
                    onChanged: (v) {
                      setState(() {
                        _num = v!;
                      });
                    },
                  ),
                ),
              ],
            ),
            const SizedBox(height: 20),
            const Text(
                'Enter a number between -5.0 and 5.0:',
                    style: TextStyle(
                      fontSize: 18.0,
                    ),
            ),
            const SizedBox(height: 10),
            TextFormField(
              initialValue: '0.0',
              decoration: const InputDecoration(
                border: OutlineInputBorder(),
                hintText: 'Enter your number'
              ),
              keyboardType: TextInputType.number,
              onChanged: (String v) {
                setState(() {
                  _txt = double.parse(v);
                });
              },
              inputFormatters: [
                FilteringTextInputFormatter.allow(RegExp(r'^-?\d{0,1}\.?\d{0,1}')),
                NumFormat(),
              ],
            ),
            const SizedBox(height: 30),
            const Center(
              child: Text(
                  'Result Display',
                style: TextStyle(
                  fontSize: 18.0,
                ),
              ),
            ),
            const SizedBox(height: 30),
            Row(
              children: <Widget>[
                Expanded(
                  child: Column(
                    children: <Widget>[
                      const Text('Result 1'),
                      Text(
                        truncateToDecimalPlaces(res1, 2).toString(),
                        style: const TextStyle(
                          fontSize: 18.0,
                        ),
                      ),
                    ],
                  ),
                ),
                Expanded(
                  child: Column(
                    children: <Widget>[
                      const Text('Result 2'),
                      Text(
                        res2.toString(),
                        style: const TextStyle(
                          fontSize: 18.0,
                        ),
                      ),
                    ],
                  ),
                ),
              ],
            ),
            const SizedBox(height: 30),
            Center(
              child: Text(
                  'Timer: $_timer',
                style: const TextStyle(
                  fontSize: 18.0,
                ),
              ),
            ),
            const SizedBox(height: 30),
            OutlinedButton(
                onPressed: btnPress,
                child: const Text('Start'),
                style: ButtonStyle(
                  foregroundColor: MaterialStateProperty.all<Color>(Colors.white),
                  backgroundColor: MaterialStateProperty.all<Color>(Colors.blueAccent),
                ),
            )
          ],
        ),
      ),
    );
  }
}