如何快速将图像旋转到特定的纬度和经度？

Posted 2023-02-23

【中文标题】如何快速将图像旋转到特定的纬度和经度？

【英文标题】：how to rotate image to a particular latitude and longitude in swift?

【发布时间】：2016-08-03 07:12:13

【问题描述】：

我正在尝试将图像从地球的任何地方旋转到特定方向，例如指向埃菲尔铁塔的箭头标志。我编写了一个用作指南针的程序。它表示东西南北方向。如何更新我的代码以找到埃菲尔铁塔（或任何其他固定地点）的方向。这是代码。

class ViewController: UIViewController,CLLocationManagerDelegate 

  var location: CLLocation!
  var imgArrow: UIImageView!
  var locationManager: CLLocationManager!

  override func viewDidLoad() 
      super.viewDidLoad()

      imgArrow = UIImageView(image: UIImage(named: "arrow.png"))
      self.view.addSubview(imgArrow)

      if(!CLLocationManager.locationServicesEnabled())
         return
      
      locationManager = CLLocationManager()
      locationManager.delegate = self

     if(CLLocationManager.headingAvailable())
        locationManager.startUpdatingHeading()
    
  

 override func viewDidAppear(animated: Bool) 
     imgArrow.center = CGPointMake(CGRectGetMidX(self.view.bounds),    CGRectGetMidY(self.view.bounds))
  
 func locationManagerShouldDisplayHeadingCalibration(manager: CLLocationManager) -> Bool 
    return true
 
 func locationManager(manager: CLLocationManager, didUpdateHeading newHeading: CLHeading) 
    let heading:CGFloat = CGFloat(-M_PI * (newHeading.magneticHeading + 90) / 180.0)


    imgArrow.transform = CGAffineTransformMakeRotation(heading)
    print(heading)
 

【问题讨论】：

Check this question

【参考方案1】：

#define degreesToRadians(x) (M_PI * x / 180.0)
#define radiandsToDegrees(x) (x * 180.0 / M_PI)
- (float)getHeadingForDirectionFromCoordinate:(CLLocationCoordinate2D)fromLoc toCoordinate:(CLLocationCoordinate2D)toLoc
    float fLat = degreesToRadians(fromLoc.latitude);
    float fLng = degreesToRadians(fromLoc.longitude);
    float tLat = degreesToRadians(toLoc.latitude);
    float tLng = degreesToRadians(toLoc.longitude);

    float degree = atan2(sin(tLng-fLng)*cos(tLat), cos(fLat)*sin(tLat)-sin(fLat)*cos(tLat)*cos(tLng-fLng));

    float deg  = radiandsToDegrees(degree);
    NSLog(@"%f",deg);

    return degreesToRadians(deg);

-(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation 
    MKAnnotationView *annotationView = [[MKAnnotationView alloc]init];
        annotationView.image = [UIImage imageNamed:@"ainted_sportscar___top_view_by_balagehun1991.png"];
        annotationView.bounds = CGRectMake(0, 0, 10, 22.5);
        annotationView.transform = CGAffineTransformRotate(mapView.transform, return angle of function);
    return annotatio.View;

也许对你有帮助