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Programming language: Crystal
Tags: Compression    
Latest version: v0.2.0

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README

Crystal Lang Polylines

Release Build Status Docs

A Crystal implementation of the Google polyline algorithm.

Greatly inspired by the Ruby implementation fast-polylines, it is mostly existing for performance comparison between Ruby C extensions and Crystal!

If you are curious: encoding is roughly the same, decoding is way faster in Crystal. If you are even more curious, make benchmark here and in fast-polylines ๐Ÿ˜‰. With a MacBook pro 1,4 GHz i5, here's the result:

โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€” ENCODING โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”

CrystalPolylines 706.82k (  1.41ยตs) (ยฑ 4.42%)  466B/op  fastest

โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”  DECODING โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”

CrystalPolylines   1.43M (699.73ns) (ยฑ 3.21%)  1.62kB/op  fastest

Installation

Add the dependency to your shard.yml:

dependencies:
  polylines:
    github: BuonOmo/polylines.cr

Run shards install

Usage

require "polylines"

Polylines.encode([{lat: 38.5, lng: -120.2}, {lat: 40.7, lng: -120.95}])
Polylines.encode([[38.5, -120.2], [40.7, -120.95]])
Polylines.encode([{38.5, -120.2}, {40.7, -120.95}])
# => "_p~iF~ps|U_ulLnnqC"

Polylines.decode("_p~iF~ps|U_ulLnnqC")
# => [{lat: 38.5, lng: -120.2}, {lat: 40.7, lng: -120.95}]

Polylines.encode([{lat: 12.1232493, lng: 2.9481493}, {lat: 13.8474392, lng: 16.8373924}], 7)
# => "yemffFi`lfw@uqj{_@}gi|gG"

Polylines.decode("yemffFi`lfw@uqj{_@}gi|gG", 7)
# => [{lat: 12.1232493, lng: 2.9481493}, {lat: 13.8474392, lng: 16.8373924}]

Contributing

  1. Fork it (BuonOmo/polylines.cr/fork)
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create a new Pull Request