Swiftpack.co - Package - malcommac/SwiftSimplify


Build Status License

SwiftSimplify is a tiny high-performance Swift polyline simplification library ported from Javascript's Simplify.js. Original work come from Leaflet, a JS interactive maps library by Vladimir Agafonkin.

It uses a combination of Douglas-Peucker and Radial Distance algorithms. Works both on browser and server platforms.

★★ Star our github repository to help us! ★★


Polyline simplification dramatically reduces the number of points in a polyline while retaining its shape, giving a huge performance boost when processing it and also reducing visual noise. For example, it's essential when rendering a 70k-points line chart or a map route in the browser using MapKit.



  • iOS 8.0, watchOS 2.0, tvOS 9.0
  • Swift 5.x+


  • If you found a bug, open an issue.
  • If you have a feature request, open an issue.
  • If you want to contribute, submit a pull request.


SwiftSimplify is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod "SwiftSimplify"


Usage is pretty straightforward: in fact you need just call the SwiftSimplify's class method simplify by passing your configuration:

let allPoints: [Point2DRepresentable] = ...
let simplifiedPoints = SwiftSimplify.simplify(allPoints, tolerance: tolerance)

Allowed parameters are:

  • points: An array of points. SwiftSimplify supports Swift's generic so you can pass an array of objects which are conforms to Point2DRepresentable protocol (both CGPoint and CLLocationCoordinate2D objects supports it).
  • tolerance: (1 by default) Affects the amount of simplification (in the same metric as the point coordinates)
  • highQuality: (false by default) Excludes distance-based preprocessing step which leads to highest quality simplification but runs ~10-20 times slower.


Daniele Margutti, me@danielemargutti.com

You can reach me on twitter @danielemargutti.

My web site is danielemargutti.com


SwiftSimplify is available under the MIT license. See the LICENSE file for more info.


Stars: 241


Used By

Total: 0


SwiftSimplify 1.1.0 - Swift 5.1+ - 2020-10-05 19:15:13

Released on 2019-09-14


  • #17 [NEW] Added support for Swift 5.1+

SwiftSimplify 1.1.1 - Swift 5.3+ - 2020-10-05 19:13:43

Released on 2020-10-05


  • #20 [NEW] Added support for Swift 5.3

SwiftSimplify 0.2.0 - Swift 3 - 2019-06-28 16:54:55

SwiftSimplify 1.0.0 - Swift 5.0+ - 2019-06-28 16:54:41

RELEASED ON: 2019-06-28


  • Swift 5 compatibility
  • Added UIBezierPath smooth drawing method