https://github.com/festelo/h3_dart

The package provides Dart version of the H3 Core library, a hexagon-based geographic grid system
https://github.com/festelo/h3_dart

android dart flutter h3 ios linux macos web windows

Last synced: about 2 hours ago
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The package provides Dart version of the H3 Core library, a hexagon-based geographic grid system

• Host: GitHub
• URL: https://github.com/festelo/h3_dart
• Owner: festelo
• License: apache-2.0
• Created: 2022-01-24T14:43:42.000Z (over 2 years ago)
• Default Branch: master
• Last Pushed: 2023-07-10T19:17:42.000Z (about 1 year ago)
• Last Synced: 2024-09-19T08:43:25.683Z (5 days ago)
• Topics: android, dart, flutter, h3, ios, linux, macos, web, windows
• Language: C
• Homepage: https://pub.dev/packages/h3_flutter
• Size: 519 KB
• Stars: 18
• Watchers: 1
• Forks: 5
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        










## H3 Flutter

The package allows to use Uber's [H3 library](https://github.com/uber/h3) directly in your Dart application

The package uses [h3_ffi](https://pub.dev/packages/h3_ffi) and [h3_web](https://pub.dev/packages/h3_web) under the hood. 

```dart

final h3Factory = const H3Factory();

final h3 = h3Factory.load();

// Get hexagons in specified triangle.

final hexagons = h3.polyfill(

  resolution: 5,

  coordinates: [

    GeoCoord(20.4522, 54.7104),

    GeoCoord(37.6173, 55.7558),

    GeoCoord(39.7015, 47.2357),

  ],

);

```  

There are also few methods ported from JS library [Geojson2H3](https://github.com/uber/geojson2h3), to access them you should instantiate Geojson2H3 class using `const Geojson2H3(h3)`. It uses [package:geojson2h3](https://pub.dev/packages/geojson2h3) internally.

## Setup

### Mobile, Desktop

Add `h3_flutter` package to `pubspec.yaml`, import it and load, no further actions required.

```dart

import 'package:h3_flutter/h3_flutter.dart';

final h3 = const H3Factory().load();

final geojson2h3 = Geojson2H3(h3);

```

### Web

Web version is built on top of `h3-js` v3.7.2, you have to import it.  

Add next line to your `index.html`:

```html

    

```  

*Note, `main.dart.js` import should go after this line*