Created
October 7, 2015 18:02
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| /** | |
| Calculate initial compass bearing between two locations | |
| - parameter fromLocation: Source Location | |
| - parameter toLocation: Destination Location | |
| - returns: bearing (CLLocationDirection) | |
| */ | |
| private func bearingFromLocation(fromLocation: CLLocation, toLocation: CLLocation) -> CLLocationDirection { | |
| var bearing: CLLocationDirection | |
| let fromLat = degreesToRadians(fromLocation.coordinate.latitude) | |
| let fromLon = degreesToRadians(fromLocation.coordinate.longitude) | |
| let toLat = degreesToRadians(toLocation.coordinate.latitude) | |
| let toLon = degreesToRadians(toLocation.coordinate.longitude) | |
| let y = sin(toLon - fromLon) * cos(toLat) | |
| let x = cos(fromLat) * sin(toLat) - sin(fromLat) * cos(toLat) * cos(toLon - fromLon) | |
| bearing = radiansToDegrees( atan2(y, x) ) as CLLocationDirection | |
| bearing = (bearing + 360.0) % 360.0 | |
| return bearing | |
| } | |
| /** | |
| Calculate final bearing between two locations | |
| - parameter fromLocation: Source Location | |
| - parameter toLocation: Destination Location | |
| - returns: bearing (CLLocationDirection) | |
| */ | |
| private func finalBearingFromLocation(fromLocation: CLLocation, toLocation: CLLocation) -> CLLocationDirection { | |
| var bearing: CLLocationDirection | |
| let fromLat = degreesToRadians(fromLocation.coordinate.latitude) | |
| let fromLon = degreesToRadians(fromLocation.coordinate.longitude) | |
| let toLat = degreesToRadians(toLocation.coordinate.latitude) | |
| let toLon = degreesToRadians(toLocation.coordinate.longitude) | |
| let y = sin(fromLon - toLon) * cos(fromLat) | |
| let x = cos(toLat) * sin(fromLat) - sin(toLat) * cos(fromLat) * cos(fromLon - toLon) | |
| bearing = radiansToDegrees( atan2(y, x) ) as CLLocationDirection | |
| bearing = (bearing + 180.0) % 360.0 | |
| return bearing | |
| } | |
| /** | |
| Calculate angle of elevation between two locations | |
| - parameter fromLocation: Source Location | |
| - parameter distance: Destination Distance | |
| - parameter altitude: Destination Altitude | |
| - returns: elevation (Double) | |
| */ | |
| private func elevationFromLocation(fromLocation: CLLocation, toLocation: CLLocation) -> Double { | |
| var elevation: Double | |
| let elevDiff = toLocation.altitude - fromLocation.altitude | |
| let distance = toLocation.distanceFromLocation(fromLocation) | |
| let elevAngle = atan2(elevDiff, distance) | |
| elevation = radiansToDegrees(elevAngle - distance / radiusCorrection) | |
| return elevation | |
| } | |
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value of radiusCorrection in line elevation = radiansToDegrees(elevAngle - distance / radiusCorrection)