latlong2

This is a fork of https://github.com/MikeMitterer/dart-latlong. The goal is to keep it up to date with Dart language changes.

LatLong provides a lightweight library for common latitude and longitude calculation.

This library supports both, the "Haversine" and the "Vincenty" algorithm.

"Haversine" is a bit faster but "Vincenty" is far more accurate!

Catmull-Rom algorithm is used for smoothing out the path.

Basic usage

Distance

    final Distance distance = new Distance();
                
                    // km = 423
                    final int km = distance.as(LengthUnit.Kilometer,
                     new LatLng(52.518611,13.408056),new LatLng(51.519475,7.46694444));
                
                    // meter = 422591.551
                    final int meter = distance(
                        new LatLng(52.518611,13.408056),
                        new LatLng(51.519475,7.46694444)
                        );
                
                

Offset

    final Distance distance = const Distance();
                    final num distanceInMeter = (earthRadius * math.pi / 4).round();
                
                    final p1 = new LatLng(0.0, 0.0);
                    final p2 = distance.offset(p1, distanceInMeter, 180);
                
                    // LatLng(latitude:-45.219848, longitude:0.0)
                    print(p2.round());
                
                    // 45° 13' 11.45" S, 0° 0' 0.00" O
                    print(p2.toSexagesimal());
                
                

Path smoothing

    // zigzag is a list of coordinates
                    final Path path = new Path.from(zigzag);
                
                    // Result is below
                    final Path steps = path.equalize(8,smoothPath: true);
                

Features and bugs

Please file feature requests and bugs at the issue tracker.

License

Copyright 2015 Michael Mitterer (office@mikemitterer.at),
                IT-Consulting and Development Limited, Austrian Branch
                
                Licensed under the Apache License, Version 2.0 (the "License");
                you may not use this file except in compliance with the License.
                You may obtain a copy of the License at
                
                   https://www.apache.org/licenses/LICENSE-2.0
                
                Unless required by applicable law or agreed to in writing,
                software distributed under the License is distributed on an
                "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
                either express or implied. See the License for the specific language
                governing permissions and limitations under the License.
                

If this plugin is helpful for you - please (Circle) me or star this repo here on GitHub

[0.9.1]

• Remove debug assertions on latitude and longitude boundaries.

[0.9.0]

• Change to const constructor for LatLng.
• remove setLatitude() and setLongitude().
• Bump minimum dart version to 3.0.

[0.8.2]

• Sexagesimal fixes and utils
• Upgrade dependencies

[0.8.1]

• Add GeoJSON compliant toJson() and fromJson().

[0.8.0]

• Use pedantic.
• camelCase constants.
• Add example.
• Other lint fixes.

[0.7.0]

• Support null safety, forked from the original repo, which is now archived.
• Address https://github.com/MikeMitterer/dart-latlong/issues/1 and issue 2.

For previous releases, see https://pub.dev/packages/latlong/changelog.