我不知道如何在MKMapView上计算面积。有没有解决这个问题的人?
这是我的代码,但它返回的结果太多了:
func ringArea() -> Double{
var area: Double = 0
if templocations.count > 2 {
var p1,p2:CLLocationCoordinate2D
for var i = 0; i < templocations.count - 1; i++ {
var loc = templocations[i] as CLLocation
p1 = CLLocationCoordinate2D(latitude: loc.coordinate.latitude, longitude: loc.coordinate.longitude)
loc = templocations[i+1] as CLLocation
p2 = CLLocationCoordinate2D(latitude: loc.coordinate.latitude, longitude: loc.coordinate.longitude)
var sinfunc: Float = (2 + sinf(Float(degreeToRadiant(p1.latitude))) + sinf(Float(degreeToRadiant(p2.latitude))))
area += degreeToRadiant(p2.longitude - p1.longitude) * Double(sinfunc)
}
area = area * kEarthRadius * kEarthRadius / 2;
}
return area
}