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| // The fixed formula | |
| struct Global { | |
| static var schoolID: Int? // Work around for passing the selected location ID | |
| static var userCoord: CLLocationCoordinate2D? | |
| func computeDistance() -> Double { | |
| // User coordinate | |
| let uLat: Double = 35.6603676639829 | |
| let uLng: Double = -80.4443005566303 | |
| // School coordinate | |
| let sLat: Double = 35.523075 | |
| let sLon: Double = -80.54142 | |
| let radius: Double = 3959.0 // Miles | |
| let deltaP = (sLat.degreesToRadians - uLat.degreesToRadians) | |
| let deltaL = (sLon.degreesToRadians - uLng.degreesToRadians) | |
| let a = sin(deltaP/2) * sin(deltaP/2) cos(uLat.degreesToRadians) * cos(sLat.degreesToRadians) * sin(deltaL/2) * sin(deltaL/2) | |
| let c = 2 * atan2(sqrt(a), sqrt(1-a)) | |
| let d = radius * c | |
| return d.roundToPlaces(2) // distance in miles rounded to 2 decimal places | |
| } | |
| } |
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