Not a member of Pastebin yet?
Sign Up,
it unlocks many cool features!
- #region Camera focus method
- private static void OnCustomPinsPropertyChanged(BindableObject bindable, object oldValue, object newValue)
- {
- CustomMap customMap = ((CustomMap)bindable);
- if (customMap.CameraFocusParameter == CameraFocusReference.OnPins)
- {
- List<Position> PositionPins = new List<Position>();
- bool onlyOnePointPresent;
- foreach (CustomPin pin in (newValue as List<CustomPin>))
- {
- PositionPins.Add(pin.Position);
- }
- Position CentralPosition = GetCentralPosition(PositionPins);
- if (PositionPins.Count > 1)
- {
- Position[] FarestPoints = GetTwoFarestPointsOfCenterPointReference(PositionPins, CentralPosition);
- customMap.CameraFocus = GetPositionAndZoomLevelForCameraAboutPositions(FarestPoints);
- onlyOnePointPresent = false;
- }
- else
- {
- customMap.CameraFocus = new CameraFocusData() { Position = CentralPosition };
- onlyOnePointPresent = true;
- }
- customMap.MoveToRegion(MapSpan.FromCenterAndRadius(customMap.CameraFocus.Position,
- (!onlyOnePointPresent) ? (customMap.CameraFocus.Distance) : (new Distance(5))));
- }
- }
- public static Position GetCentralPosition(List<Position> positions)
- {
- if (positions.Count == 1)
- {
- foreach (Position pos in positions)
- {
- return (pos);
- }
- }
- double lat = 0;
- double lng = 0;
- foreach (var pos in positions)
- {
- lat += pos.Latitude;
- lng += pos.Longitude;
- }
- var total = positions.Count;
- lat = lat / total;
- lng = lng / total;
- return new Position(lat, lng);
- }
- public class DataCalc
- {
- public Position Pos { get; set; }
- public double Distance { get; set; }
- }
- public static Position[] GetTwoFarestPointsOfCenterPointReference(List<Position> farestPosition, Position centerPosition)
- {
- Position[] FarestPos = new Position[2];
- List<DataCalc> dataCalc = new List<DataCalc>();
- Debug.WriteLine("So the center is on [{0}]/[{1}]", centerPosition.Latitude, centerPosition.Longitude);
- foreach (Position pos in farestPosition)
- {
- dataCalc.Add(new DataCalc()
- {
- Pos = pos,
- Distance = Math.Sqrt(Math.Pow(pos.Latitude - centerPosition.Latitude, 2) + Math.Pow(pos.Longitude - centerPosition.Longitude, 2))
- });
- }
- DataCalc First = new DataCalc() { Distance = 0 };
- foreach (DataCalc dc in dataCalc)
- {
- if (dc.Distance > First.Distance)
- {
- First = dc;
- }
- }
- Debug.WriteLine("The farest one is on [{0}]/[{1}]", First.Pos.Latitude, First.Pos.Longitude);
- DataCalc Second = new DataCalc() { Distance = 0 };
- foreach (DataCalc dc in dataCalc)
- {
- if (dc.Distance > Second.Distance
- && (dc.Pos.Latitude != First.Pos.Latitude && dc.Pos.Longitude != First.Pos.Longitude))
- {
- Second = dc;
- }
- }
- Debug.WriteLine("the second is on [{0}]/[{1}]", Second.Pos.Latitude, Second.Pos.Longitude);
- FarestPos[0] = First.Pos;
- FarestPos[1] = Second.Pos;
- return (FarestPos);
- }
- public class CameraFocusData
- {
- public Position Position { get; set; }
- public Distance Distance { get; set; }
- }
- //HAVERSINE
- public static CameraFocusData GetPositionAndZoomLevelForCameraAboutPositions(Position[] FarestPoints)
- {
- double earthRadius = 6371000; //metros
- Position pos1 = FarestPoints[0];
- Position pos2 = FarestPoints[1];
- double latitud1Radianes = pos1.Latitude * (Math.PI / 180.0);
- double latitud2Radianes = pos2.Latitude * (Math.PI / 180.0);
- double longitud1Radianes = pos2.Longitude * (Math.PI / 180.0);
- double longitud2Radianes = pos2.Longitude * (Math.PI / 180.0);
- double deltaLatitud = (pos2.Latitude - pos1.Latitude) * (Math.PI / 180.0);
- double deltaLongitud = (pos2.Longitude - pos1.Longitude) * (Math.PI / 180.0);
- double sum1 = Math.Sin(deltaLatitud / 2) * Math.Sin(deltaLatitud / 2);
- double sum2 = Math.Cos(latitud1Radianes) * Math.Cos(latitud2Radianes) * Math.Sin(deltaLongitud / 2) * Math.Sin(deltaLongitud / 2);
- var a = sum1 + sum2;
- var c = 2 * Math.Atan2(Math.Sqrt(a), Math.Sqrt(1 - a));
- var distance = earthRadius * c;
- /* lt is deltaLatitud
- * lng is deltaLongitud*/
- var Bx = Math.Cos(latitud2Radianes) * Math.Cos(deltaLongitud);
- var By = Math.Cos(latitud2Radianes) * Math.Sin(deltaLongitud);
- var lt = Math.Atan2(Math.Sin(latitud1Radianes) + Math.Sin(latitud2Radianes),
- Math.Sqrt((Math.Cos(latitud1Radianes) + Bx) * (Math.Cos(latitud2Radianes) + Bx) + By * By));//Latitud del punto medio
- var lng = longitud1Radianes + Math.Atan2(By, Math.Cos(longitud1Radianes) + Bx);//Longitud del punto medio
- Debug.WriteLine("the final pos of the camera is on [{0}]/[{1}]", lt, lng);
- return (new CameraFocusData() { Position = new Position(lt, lng), Distance = new Distance(distance + 0.2) });
- }
- #endregion
- public static readonly BindableProperty CustomPinsProperty =
- BindableProperty.Create(nameof(CustomPins), typeof(IList<CustomPin>), typeof(CustomMap), null,
- propertyChanged: OnCustomPinsPropertyChanged);
- #region Camera focus definition
- public class CameraFocusData
- {
- public Position Position { get; set; }
- public Distance Distance { get; set; }
- }
- private static void OnCustomPinsPropertyChanged(BindableObject bindable, object oldValue, object newValue)
- {
- CustomMap customMap = ((CustomMap)bindable);
- if (customMap.CameraFocusParameter == CameraFocusReference.OnPins)
- {
- List<double> latitudes = new List<double>();
- List<double> longitudes = new List<double>();
- foreach (CustomPin pin in (newValue as List<CustomPin>))
- {
- latitudes.Add(pin.Position.Latitude);
- longitudes.Add(pin.Position.Longitude);
- }
- double lowestLat = latitudes.Min();
- double highestLat = latitudes.Max();
- double lowestLong = longitudes.Min();
- double highestLong = longitudes.Max();
- double finalLat = (lowestLat + highestLat) / 2;
- double finalLong = (lowestLong + highestLong) / 2;
- double distance = DistanceCalculation.GeoCodeCalc.CalcDistance(lowestLat, lowestLong, highestLat, highestLong, DistanceCalculation.GeoCodeCalcMeasurement.Kilometers);
- customMap.MoveToRegion(MapSpan.FromCenterAndRadius(new Position(finalLat, finalLong), Distance.FromKilometers(distance * 0.7)));
- }
- }
- private class DistanceCalculation
- {
- public static class GeoCodeCalc
- {
- public const double EarthRadiusInMiles = 3956.0;
- public const double EarthRadiusInKilometers = 6367.0;
- public static double ToRadian(double val) { return val * (Math.PI / 180); }
- public static double DiffRadian(double val1, double val2) { return ToRadian(val2) - ToRadian(val1); }
- public static double CalcDistance(double lat1, double lng1, double lat2, double lng2)
- {
- return CalcDistance(lat1, lng1, lat2, lng2, GeoCodeCalcMeasurement.Miles);
- }
- public static double CalcDistance(double lat1, double lng1, double lat2, double lng2, GeoCodeCalcMeasurement m)
- {
- double radius = GeoCodeCalc.EarthRadiusInMiles;
- if (m == GeoCodeCalcMeasurement.Kilometers) { radius = GeoCodeCalc.EarthRadiusInKilometers; }
- return radius * 2 * Math.Asin(Math.Min(1, Math.Sqrt((Math.Pow(Math.Sin((DiffRadian(lat1, lat2)) / 2.0), 2.0) + Math.Cos(ToRadian(lat1)) * Math.Cos(ToRadian(lat2)) * Math.Pow(Math.Sin((DiffRadian(lng1, lng2)) / 2.0), 2.0)))));
- }
- }
- public enum GeoCodeCalcMeasurement : int
- {
- Miles = 0,
- Kilometers = 1
- }
- }
- #endregion
Add Comment
Please, Sign In to add comment