https://github.com/marchdev-tk/google_polyline_algorithm

Dart implementation of Googles Polyline Encoding lossy compression Algorithm.
https://github.com/marchdev-tk/google_polyline_algorithm

dart dart-library dart-package dart2 dartlang google-maps polyline polyline-algorithm polyline-decoder polyline-encoder

Last synced: 3 months ago
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Dart implementation of Googles Polyline Encoding lossy compression Algorithm.

• Host: GitHub
• URL: https://github.com/marchdev-tk/google_polyline_algorithm
• Owner: marchdev-tk
• License: bsd-3-clause
• Created: 2020-02-28T21:54:14.000Z (almost 5 years ago)
• Default Branch: master
• Last Pushed: 2022-02-21T14:44:20.000Z (almost 3 years ago)
• Last Synced: 2024-09-29T16:05:20.946Z (4 months ago)
• Topics: dart, dart-library, dart-package, dart2, dartlang, google-maps, polyline, polyline-algorithm, polyline-decoder, polyline-encoder
• Language: Dart
• Homepage:
• Size: 24.4 KB
• Stars: 12
• Watchers: 1
• Forks: 1
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • Contributing: CONTRIBUTING.md
  • License: LICENSE
  • Code of conduct: CODE_OF_CONDUCT.md

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README

        
# google_polyline_algorithm

![Build](https://github.com/marchdev-tk/google_polyline_algorithm/workflows/build/badge.svg)

[![codecov](https://codecov.io/gh/marchdev-tk/google_polyline_algorithm/branch/master/graph/badge.svg)](https://codecov.io/gh/marchdev-tk/google_polyline_algorithm)

[![Pub](https://img.shields.io/pub/v/google_polyline_algorithm.svg)](https://pub.dartlang.org/packages/google_polyline_algorithm)

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Dart implementation of Googles Polyline Encoding lossy compression Algorithm.

## Getting Started

This package adds following methods to work with Googles Polyline Encoding Algorithm:

* `encodePoint(num current, {num previous = 0, int accuracyExponent = 5})` encodes a single coordinate

* `encodePolyline(List> coordinates, {int accuracyExponent = 5})` encodes a list of coordinates into an encoded polyline stirng

* `decodePolyline(String polyline, {int accuracyExponent = 5})` decodes an encoded polyline string into a list of coordinates

## Examples

```dart

import 'package:google_polyline_algorithm/google_polyline_algorithm.dart';

final coord = encodePoint(-179.9832104);

print(coord);

// output is `~oia@'

final coords = encodePolyline([

  [38.5, -120.2],

  [40.7, -120.95],

  [43.252, -126.453],

]);

print(coords);

// output is `_p~iF~ps|U_ulLnnqC_mqNvxq`@'

final polyline = decodePolyline('_p~iF~ps|U_ulLnnqC_mqNvxq`@');

print(polyline);

// output is [[38.5, -120.2],[40.7, -120.95],[43.252, -126.453],]

```