Question

Swift 4 iOS 11.x

运行此代码...以获取GPS方位并希望将其与指南针设置相结合。

func getBearing(toPoint point: CLLocationCoordinate2D, longitude:Double, latitude: Double) -> Double {
    func degreesToRadians(degrees: Double) -> Double { return degrees * Double.pi / 180.0 }
    func radiansToDegrees(radians: Double) -> Double { return radians * 180.0 / Double.pi }

    let lat1 = degreesToRadians(degrees: latitude)
    let lon1 = degreesToRadians(degrees: longitude)

    let lat2 = degreesToRadians(degrees: point.latitude);
    let lon2 = degreesToRadians(degrees: point.longitude);

    let dLon = lon2 - lon1;

    let y = sin(dLon) * cos(lat2);
    let x = cos(lat1) * sin(lat2) - sin(lat1) * cos(lat2) * cos(dLon);
    let radiansBearing = atan2(y, x);

    return radiansBearing
}

要获得弧度值，我需要前往..

angle2U = self.getBearing(toPoint: goFigure, longitude:  (self.locationManager.location?.coordinate.longitude)!, latitude:  (self.locationManager.location?.coordinate.latitude)!)

然后这段代码用它来转换图像并给我一个相对于我指向的方向。我在这次调用中使用了从这个angle2U得到的值...

func locationManager(_ manager: CLLocationManager, didUpdateHeading heading: CLHeading) {

direction2G = CGFloat(heading.magneticHeading * Double.pi/180)

DispatchQueue.main.async {
  let direction2GN = CGFloat(self.angle2U) - direction2G
  let tr2 = CGAffineTransform.identity.rotated(by: direction2GN)
  self.degreeAngle.text = String(describing: direction2GN)
  self.directionImage.transform = tr2
}

我认为哪些是有效的，但我想与那些知道他/她正在做什么的人核实，因为我至少部分地从试错中获得了这个，我不确定数学。

快速将GPS轴承与指南针方向相结合

0 个答案: