https://github.com/jhermsmeier/node-google-polyline

Encode / decode Google's polyline format
https://github.com/jhermsmeier/node-google-polyline

encoder geodata google-polyline maps parser polyline

Last synced: 2 months ago
JSON representation

Encode / decode Google's polyline format

• Host: GitHub
• URL: https://github.com/jhermsmeier/node-google-polyline
• Owner: jhermsmeier
• License: mit
• Created: 2016-10-11T13:50:09.000Z (about 8 years ago)
• Default Branch: master
• Last Pushed: 2020-08-31T18:52:35.000Z (over 4 years ago)
• Last Synced: 2024-10-11T07:34:14.473Z (3 months ago)
• Topics: encoder, geodata, google-polyline, maps, parser, polyline
• Language: JavaScript
• Size: 45.9 KB
• Stars: 38
• Watchers: 2
• Forks: 12
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.md

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README

        
# google-polyline

[![npm](https://img.shields.io/npm/v/google-polyline.svg?style=flat-square)](https://npmjs.com/package/google-polyline)

[![npm license](https://img.shields.io/npm/l/google-polyline.svg?style=flat-square)](https://npmjs.com/package/google-polyline)

[![npm downloads](https://img.shields.io/npm/dm/google-polyline.svg?style=flat-square)](https://npmjs.com/package/google-polyline)

[![build status](https://img.shields.io/travis/jhermsmeier/node-google-polyline.svg?style=flat-square)](https://travis-ci.org/jhermsmeier/node-google-polyline)

Encodes and decodes [Google's polyline format](https://developers.google.com/maps/documentation/utilities/polylinealgorithm)

## Install via [npm](https://npmjs.com)

```sh

$ npm install --save google-polyline

```

## Usage

```js

var polyline = require( 'google-polyline' )

```

```js

polyline.encode([

  [ 38.5, -120.2 ],

  [ 40.7, -120.95 ],

  [ 43.252, -126.453 ]

])

> '_p~iF~ps|U_ulLnnqC_mqNvxq`@'

```

```js

polyline.decode( '_p~iF~ps|U_ulLnnqC_mqNvxq`@' )

> [

  [ 38.5, -120.2 ],

  [ 40.7, -120.95 ],

  [ 43.252, -126.453 ]

]

```

## Benchmarks

```sh

$ npm run benchmark

```

```

# decode: 3 points ⨉ 100000

ok ~21 ms (0 s + 21199187 ns)

# decode: ~350 points ⨉ 100000

ok ~741 ms (0 s + 740819246 ns)

# encode: 3 points ⨉ 100000

ok ~221 ms (0 s + 221480259 ns)

# encode: ~350 points ⨉ 100000

ok ~2.4 s (2 s + 403294668 ns)

```