SimplifySwift 1.2.2

SimplifySwift 1.2.2

Maintained by Tomislav Filipcic.


Version License Platform

Simplify-Swift is a high-performance Swift polyline simplification library ported from Simplify.js. The original Javascript library was extracted from Leaflet, a JS interactive maps library by Vladimir Agafonkin. It uses a combination of Douglas-Peucker and Radial Distance algorithms.

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 large polyline in MapKit.

Simplify-Swift screenshot


To run the example project, clone the repo, and run pod install from the Example directory first.



To integrate Simplify-Swift into your Xcode project using CocoaPods, specify it in your Podfile:

pod 'Simplify-Swift'

Swift Package Manager (SPM)

To integrate using Apple's Swift package manager, add the following as a dependency to your Package.swift:

.package(url: "", .upToNextMajor(from: "1.0.0"))


class func simplify<T:SimplifyValue>(_ points: [T], tolerance: Float?, highQuality: Bool = false) -> [T]

Returns an array of simplified points

  • parameter points: An array of points of SimplifyValue {x: Double, y: Double} format. Generics are supported so you can pass in an array of [CGPoint] or [CLLocationCoordinate2D].
  • parameter tolerance: Affects the amount of simplification (in the same metric as the point coordinates). Default: 1.
  • parameter highQuality: Excludes distance-based preprocessing step which leads to highest quality simplification but runs ~10-20 times slower. Default: false.


Tomislav Filipcic, [email protected], @tomislav


Simplify-Swift is available under the MIT license. See the LICENSE file for more info.