jeodezi 1.0.3

Jeodezi is Dart version of Jeodezi Kotlin which is based of Chris Veness's amazing work Geodesy Functions. Geodesy Functions is written in JavaScript and contains dozens of functions to make calculati [...]

example/lib/main.dart

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

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: 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: const ExampleHomeScreen(),
    );
  }
}

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

  @override
  State<ExampleHomeScreen> createState() => _ExampleHomeScreenState();
}

class _ExampleHomeScreenState extends State<ExampleHomeScreen> {
  final greatCircle = GreatCircle();
  final istCoordinates = Coordinate(
      41.28111111, 28.75333333); // The coordinates of Istanbul Airport
  final jfkCoordinates = Coordinate(
      40.63980103, -73.77890015); // The coordinates of New York JFK Airport
  final fcoCoordinates = Coordinate(
      41.8002778, 12.2388889); // The coordinates of Roma Fiumicino Airport
  final sfoCoordinates = Coordinate(
      37.615223, -122.389977); // The coordinates of San Francisco SFO Airport
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: SafeArea(
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.center,
          mainAxisAlignment: MainAxisAlignment.spaceEvenly,
          children: [
            const Center(
              child: Text(
                "Jeodezi Functions",
                style: TextStyle(fontSize: 40),
              ),
            ),
            ElevatedButton(
                onPressed: () {
                  final distance =
                      greatCircle.distance(istCoordinates, jfkCoordinates);
                  ScaffoldMessenger.of(context).showSnackBar(SnackBar(
                    content: Text(
                        "Great Circle distance between Istanbul Airport and JFK Airport is ${distance.toStringAsFixed(2)} km"),
                  ));
                },
                child: const Text("Calculate Distance")),
            ElevatedButton(
                onPressed: () {
                  final distance =
                      greatCircle.distanceInNm(istCoordinates, jfkCoordinates);
                  ScaffoldMessenger.of(context).showSnackBar(SnackBar(
                    content: Text(
                        "Great Circle distance between Istanbul Airport and JFK Airport is ${distance.toStringAsFixed(2)} nm"),
                  ));
                },
                child: const Text("Calculate Distance (Nm)")),
            ElevatedButton(
                onPressed: () {
                  final bearing =
                      greatCircle.bearing(istCoordinates, jfkCoordinates);
                  ScaffoldMessenger.of(context).showSnackBar(SnackBar(
                    content: Text(
                        "Initial bearing for great circle between Istanbul Airport and JFK Airport is ${bearing.toStringAsFixed(2)} degrees"),
                  ));
                },
                child: const Text("Bearing")),
            ElevatedButton(
                onPressed: () {
                  final bearing =
                      greatCircle.finalBearing(istCoordinates, jfkCoordinates);
                  ScaffoldMessenger.of(context).showSnackBar(SnackBar(
                    content: Text(
                        "Final bearing for great circle between Istanbul Airport and JFK Airport is ${bearing.toStringAsFixed(2)} degrees"),
                  ));
                },
                child: const Text("Final Bearing")),
            ElevatedButton(
                onPressed: () {
                  final midpoint =
                      greatCircle.midpoint(istCoordinates, jfkCoordinates);
                  ScaffoldMessenger.of(context).showSnackBar(SnackBar(
                    content: Text(
                        "Midpoint's coordinates of great circle between Istanbul Airport and JFK Airport are $midpoint "),
                  ));
                },
                child: const Text("Midpoint")),
            ElevatedButton(
                onPressed: () {
                  const fraction = 1.0;
                  final intermediate = greatCircle.intermediate(
                      startPoint: istCoordinates,
                      endPoint: jfkCoordinates,
                      fraction: fraction);

                  ScaffoldMessenger.of(context).showSnackBar(SnackBar(
                    content: Text(
                        "For $fraction fraction, intermediate point's coordinates of great circle between Istanbul Airport and JFK Airport are $intermediate "),
                  ));
                },
                child: const Text("Intermediate")),
            ElevatedButton(
                onPressed: () {
                  const bearingFromIstanbulToWest = 270.0;
                  const bearingFromRomeToNorthEast = 45.0;
                  final intersection = greatCircle.intersection(
                      firstPoint: istCoordinates,
                      firstBearing: bearingFromIstanbulToWest,
                      secondPoint: fcoCoordinates,
                      secondBearing: bearingFromRomeToNorthEast);

                  ScaffoldMessenger.of(context).showSnackBar(SnackBar(
                    content: Text(
                        "Intersection coordinates of from Istanbul Airport with bearing $bearingFromIstanbulToWest and from Roma Fiumicino Airport with bearing $bearingFromRomeToNorthEast is $intersection "),
                  ));
                },
                child: const Text("Intersection")),
            ElevatedButton(
                onPressed: () {
                  const bearingFromIstanbulToWest = 270.0;
                  const distanceInKm = 168.0; //apprx 100 nm
                  final destination = greatCircle.destination(
                    startPoint: istCoordinates,
                    bearing: bearingFromIstanbulToWest,
                    distance: distanceInKm,
                  );

                  ScaffoldMessenger.of(context).showSnackBar(SnackBar(
                    content: Text(
                        "The destination coordinates of $distanceInKm km away from Istanbul Airport on bearing $bearingFromIstanbulToWest is $destination"),
                  ));
                },
                child: const Text("Destination")),
            ElevatedButton(
                onPressed: () {
                  final crossTrackDistance = greatCircle.crossTrackDistance(
                    currentPoint: fcoCoordinates,
                    startPoint: istCoordinates,
                    endPoint: jfkCoordinates,
                  );

                  ScaffoldMessenger.of(context).showSnackBar(SnackBar(
                    content: Text(
                        "Distance from Rome Fiumicino Airport to great circle between Istanbul Airport and JFK Airport is ${crossTrackDistance.toStringAsFixed(2)} km "),
                  ));
                },
                child: const Text("Cross Track")),
            ElevatedButton(
                onPressed: () {
                  final alongTrackDistanceTo = greatCircle.alongTrackDistanceTo(
                    currentPoint: fcoCoordinates,
                    startPoint: istCoordinates,
                    endPoint: jfkCoordinates,
                  );

                  ScaffoldMessenger.of(context).showSnackBar(SnackBar(
                    content: Text(
                        "Distance from Istanbul Airport to the point where Roma Fiumicino Airport crosses great circle between Istanbul Airport and JFK Airport is ${alongTrackDistanceTo.toStringAsFixed(2)} km "),
                  ));
                },
                child: const Text("Along Track")),
            ElevatedButton(
                onPressed: () {
                  const bearingFromIstanbulToWest = 270.0;
                  final maxLatitude = greatCircle.maxLatitude(
                    startPoint: istCoordinates,
                    bearing: bearingFromIstanbulToWest,
                  );

                  ScaffoldMessenger.of(context).showSnackBar(SnackBar(
                    content: Text(
                        "The maximum latitude of the path from Istanbul Airport on bearing $bearingFromIstanbulToWest is $maxLatitude degrees"),
                  ));
                },
                child: const Text("Max Latitudes")),
            ElevatedButton(
                onPressed: () {
                  const latitude = 70.0; // means 70 degrees north
                  final crossingParallels = greatCircle.crossingParallels(
                    startPoint: istCoordinates,
                    endPoint: sfoCoordinates,
                    latitude: latitude,
                  );
                  if (crossingParallels.isEmpty) {
                    ScaffoldMessenger.of(context).showSnackBar(const SnackBar(
                      content: Text(
                          "The great circle between Istanbul Airport and SFO Airport does not cross latitude $latitude"),
                    ));
                  } else {
                    ScaffoldMessenger.of(context).showSnackBar(SnackBar(
                      content: Text(
                          "The great circle between Istanbul Airport and SFO Airport crosses latitude $latitude at longitudes ${crossingParallels[0]} and ${crossingParallels[1]}"),
                    ));
                  }
                },
                child: const Text("Crossing Parallels")),
          ],
        ),
      ),
    );
  }
}