SmoothedLocationPlayground2.swift

import CoreLocation

extension CLLocation {
    public static func +(lhs: CLLocation, rhs: CLLocation) -> CLLocation {
        let summedLat  = lhs.coordinate.latitude  + rhs.coordinate.latitude
        let summedLong = lhs.coordinate.longitude + rhs.coordinate.longitude
        return CLLocation(latitude: summedLat, longitude: summedLong)
    }
    
    public static func /(lhs: CLLocation, rhs: Double) -> CLLocation {
        let dividedLat  = lhs.coordinate.latitude  / rhs
        let dividedLong = lhs.coordinate.longitude / rhs
        return CLLocation(latitude: dividedLat, longitude: dividedLong)
    }
    
    public static func +=(left: inout CLLocation, right: CLLocation) {
        left = left + right
    }
}

class LocationSmoother {
    
    private(set) var lastLocation: CLLocation?
    
    func smooth(_ loc: CLLocation) -> CLLocation {
        if let last = lastLocation {
            lastLocation = (last + loc) / 2
        }
        else {
            lastLocation = loc
        }
        return lastLocation!
    }
}

let loc1 = CLLocation(latitude: 438, longitude: 236)
let loc2 = CLLocation(latitude: 439, longitude: 237)
let loc3 = CLLocation(latitude: 440, longitude: 238)
let loc4 = CLLocation(latitude: 450, longitude: 250)
let loc5 = CLLocation(latitude: 442, longitude: 240)
let loc6 = CLLocation(latitude: 444, longitude: 242)

let smoother = LocationSmoother()

print("Actual location: \(loc1.coordinate) \nSmoothed location: \(smoother.smooth(loc1).coordinate)\n")
print("Actual location: \(loc2.coordinate) \nSmoothed location: \(smoother.smooth(loc2).coordinate)\n")
print("Actual location: \(loc3.coordinate) \nSmoothed location: \(smoother.smooth(loc3).coordinate)\n")
print("Actual location: \(loc4.coordinate) \nSmoothed location: \(smoother.smooth(loc4).coordinate)\n")
print("Actual location: \(loc5.coordinate) \nSmoothed location: \(smoother.smooth(loc5).coordinate)\n")
print("Actual location: \(loc6.coordinate) \nSmoothed location: \(smoother.smooth(loc6).coordinate)\n")