# SwifterSwift/SwifterSwift

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b24e70f Sep 20, 2018
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 // // CLLocationExtensions.swift // SwifterSwift // // Created by Luciano Almeida on 21/04/17. // Copyright © 2017 SwifterSwift // #if canImport(CoreLocation) import CoreLocation // MARK: - Methods public extension CLLocation { /// SwifterSwift: Calculate the half-way point along a great circle path between the two points. /// /// - Parameters: /// - start: Start location. /// - end: End location. /// - Returns: Location that represents the half-way point. public static func midLocation(start: CLLocation, end: CLLocation) -> CLLocation { let lat1 = Double.pi * start.coordinate.latitude / 180.0 let long1 = Double.pi * start.coordinate.longitude / 180.0 let lat2 = Double.pi * end.coordinate.latitude / 180.0 let long2 = Double.pi * end.coordinate.longitude / 180.0 // Formula // Bx = cos φ2 ⋅ cos Δλ // By = cos φ2 ⋅ sin Δλ // φm = atan2( sin φ1 + sin φ2, √(cos φ1 + Bx)² + By² ) // λm = λ1 + atan2(By, cos(φ1)+Bx) // Source: http://www.movable-type.co.uk/scripts/latlong.html let bxLoc = cos(lat2) * cos(long2 - long1) let byLoc = cos(lat2) * sin(long2 - long1) let mlat = atan2(sin(lat1) + sin(lat2), sqrt((cos(lat1) + bxLoc) * (cos(lat1) + bxLoc) + (byLoc * byLoc))) let mlong = (long1) + atan2(byLoc, cos(lat1) + bxLoc) return CLLocation(latitude: (mlat * 180 / Double.pi), longitude: (mlong * 180 / Double.pi)) } /// SwifterSwift: Calculate the half-way point along a great circle path between self and another points. /// /// - Parameter point: End location. /// - Returns: Location that represents the half-way point. public func midLocation(to point: CLLocation) -> CLLocation { return CLLocation.midLocation(start: self, end: point) } /// SwifterSwift: Calculates the bearing to another CLLocation. /// /// - Parameters: /// - destination: Location to calculate bearing. /// - Returns: Calculated bearing degrees in the range 0° ... 360° public func bearing(to destination: CLLocation) -> Double { // http://stackoverflow.com/questions/3925942/cllocation-category-for-calculating-bearing-w-haversine-function let lat1 = Double.pi * coordinate.latitude / 180.0 let long1 = Double.pi * coordinate.longitude / 180.0 let lat2 = Double.pi * destination.coordinate.latitude / 180.0 let long2 = Double.pi * destination.coordinate.longitude / 180.0 // Formula: θ = atan2( sin Δλ ⋅ cos φ2 , cos φ1 ⋅ sin φ2 − sin φ1 ⋅ cos φ2 ⋅ cos Δλ ) // Source: http://www.movable-type.co.uk/scripts/latlong.html let rads = atan2( sin(long2 - long1) * cos(lat2), cos(lat1) * sin(lat2) - sin(lat1) * cos(lat2) * cos(long2 - long1)) let degrees = rads * 180 / Double.pi return (degrees+360).truncatingRemainder(dividingBy: 360) } } #endif