simple_latlng.dart

/// The main point class
class LatLng {
  /// Main contructor, no validation
  const LatLng(this.latitude, this.longitude);

  /// Contructor with coordinates validation
  LatLng.validate(this.latitude, this.longitude) {
    if (latitude > 90.0) {
      throw WrongCoordinateException("The latitude can not exceed 90.0");
    }
    if (latitude < -90.0) {
      throw WrongCoordinateException(
          "The latitude can not be lower than -90.0");
    }
    if (longitude > 180.0) {
      throw WrongCoordinateException("The longitude can not exceed 180.0");
    }
    if (longitude < -180.0) {
      throw WrongCoordinateException(
          "The longitude can not be lower than -180.0");
    }
  }

  /// The latitude
  final double latitude;

  /// The longitude
  final double longitude;

  @override
  String toString() => "$latitude / $longitude";

  @override
  int get hashCode => latitude.hashCode + longitude.hashCode;

  @override
  bool operator ==(final Object other) =>
      other is LatLng &&
      latitude == other.latitude &&
      longitude == other.longitude;
}

/// An exception for an error on a coordinate
class WrongCoordinateException implements Exception {
  /// Provide a message
  WrongCoordinateException(this.message);

  /// The error message
  final String message;
}