文件列表:

.metadata (309, 2023-12-01)
CHANGELOG.md (316, 2023-12-01)
LICENSE (11357, 2023-12-01)
example/ (0, 2023-12-01)
example/main.dart (931, 2023-12-01)
lib/ (0, 2023-12-01)
lib/geohash.dart (10850, 2023-12-01)
lib/proximity_hash.dart (4314, 2023-12-01)
pubspec.yaml (284, 2023-12-01)
test/ (0, 2023-12-01)
test/geohash_test.dart (2214, 2023-12-01)
test/proximity_hash_test.dart (1605, 2023-12-01)

# Dart Proximity Hash  **Proximity Hash** generates a set of geohashes that cover a circular area, given the center coordinates and the radius. Geohash is a public domain geocode system which encodes a geographic location into a short string of letters and digits and is used as unique identifies and to represent point data in databases. For example the point `25.6953° S, 54.4367° W` will covert to `6g3mc626`. ## Geohash Proximity hash also comes with a geohash library forked from [dart_geohash](https://github.com/nfrawley93/dart_geohash/pull/5) since it was not being actively maintained. ```dart import 'package:proximity_hash/geohash.dart'; ``` ## Install To get this plugin, add `proximity_hash` as a [dependency in your pubspec.yaml file](https://flutter.io/platform-plugins/). For example: ```yaml dependencies: proximity_hash: ^1.1.0 ``` ## Usage To get all the geohashes within a radius of `5000` meters from the point `25.6953° S, 54.4367° W` with precision `3` simply import the library and call `createGeohashes()`. The precision dictates how long and how many geohashes are returned. For example a precision of 3 returns geohahses of length 3. ``` dart import 'package:proximity_hash/proximity_hash.dart'; List proximityGeohashes = createGeohashes(48.864716, 2.349014, 5000, 3); // proximityGeohashes == ["u0d","u09"] ``` ## Performance Benchmark of `createGeohashes` for different precisions with radius `1000`. Performance can become limiting starting at precision 9. Note that a larger radius will also decrease performance. | Precicion | Time | | ----------- | ----------- | | 1 | .0068 sec | | 2 | .0068 sec | | 3 | .0070 sec | | 4 | .0070 sec | | 5 | .0070 sec | | 6 | .0079 sec | | 7 | .0232 sec | | 8 | .1664 sec | | 9 | 4.996 sec | | 10 | 153.5 sec | ## Issues Please file any issues, bugs or feature requests as an issue on our [GitHub](https://github.com/anovis/proximity_hash/issues) page. ## Want to Contribute If you would like to contribute to the plugin (e.g. by improving the documentation, solving a bug or adding a cool new feature) submit a [pull request](https://github.com/anovis/proximity_hash/pulls). ## Want to Support ___ Based on [proximityhash](https://github.com/ashwin711/proximityhash)

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