calc_lat_long 1.0.0

A package to calculate distance between two cordinate points Latitude and Longitude.

example/lib/main.dart

import 'package:calc_lat_long/calc_lat_long.dart';
import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'Example calculate two points'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final TextEditingController latitude1 = TextEditingController();
  final TextEditingController latitude2 = TextEditingController();
  final TextEditingController longitude1 = TextEditingController();
  final TextEditingController longitude2 = TextEditingController();
  var distance = 0.0;
  var _unitLength = [UnitLength.km, UnitLength.mi, UnitLength.nm];
  UnitLength _selectedUnit = UnitLength.km;

  void _dropDownItemSelected(UnitLength novoItem) {
    setState(() {
      _selectedUnit = novoItem;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Padding(
        padding: EdgeInsets.all(16),
        child: ListView(
          keyboardDismissBehavior: ScrollViewKeyboardDismissBehavior.onDrag,
          children: <Widget>[
            TextField(
              controller: latitude1,
              decoration: InputDecoration(labelText: "Latitude 1"),
            ),
            TextField(
              controller: longitude1,
              decoration: InputDecoration(labelText: "Longitude 1"),
            ),
            TextField(
              controller: latitude2,
              decoration: InputDecoration(labelText: "Latitude 2"),
            ),
            TextField(
              controller: longitude2,
              decoration: InputDecoration(labelText: "Longitude 2"),
            ),
            DropdownButton<UnitLength>(
                items: _unitLength.map((UnitLength dropDownStringItem) {
                  return DropdownMenuItem<UnitLength>(
                    value: dropDownStringItem,
                    child: Text(dropDownStringItem.toString()),
                  );
                }).toList(),
                onChanged: (UnitLength newUnitSelected) {
                  _dropDownItemSelected(newUnitSelected);
                  setState(() {
                    _selectedUnit = newUnitSelected;
                  });
                },
                value: _selectedUnit),
            SizedBox(
              height: 15,
            ),
            ElevatedButton(
                onPressed: () {
                  var dist = CalcDistance.distance(
                      num.parse(latitude1.text),
                      num.parse(latitude2.text),
                      num.parse(longitude1.text),
                      num.parse(longitude2.text),
                      _selectedUnit);

                  setState(() {
                    distance = dist;
                  });
                },
                child: Text("Calculate")),
            SizedBox(
              height: 15,
            ),
            Text(distance == 0 ? "" : "Distance: $distance")
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: null,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ),
    );
  }
}