google-polyline

Encodes and decodes Google's polyline format

Install via npm

$ npm install --save google-polyline

Usage

import polyline from 'google-polyline' // OR
const polyline = require( 'google-polyline' )

polyline.encode([
  [ 38.5, -120.2 ],
  [ 40.7, -120.95 ],
  [ 43.252, -126.453 ]
])

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

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

> [
  [ 38.5, -120.2 ],
  [ 40.7, -120.95 ],
  [ 43.252, -126.453 ]
]

Benchmarks

$ npm run benchmark

# decode: 3 points ⨉ 100000
ok ~14 ms (0 s + 14424306 ns)

# decode: ~350 points ⨉ 100000
ok ~573 ms (0 s + 573276343 ns)

# encode: 3 points ⨉ 100000
ok ~34 ms (0 s + 33761842 ns)

# encode: ~350 points ⨉ 100000
ok ~1.24 s (1 s + 244708525 ns)