| public BoundingCoordinates ( double distance ) : LonelySharp.GeoLocation[] | ||
| distance | double | The distance from the point represented by this /// GeoLocation instance. Must me measured in the same unit as the radius argument. /// |
| return | LonelySharp.GeoLocation[] | |
public GeoLocation[] BoundingCoordinates(double distance)
{
if (distance < 0d)
throw new Exception("Distance cannot be less than 0");
// angular distance in radians on a great circle
double radDist = distance / earthRadius;
double minLat = radLat - radDist;
double maxLat = radLat + radDist;
double minLon, maxLon;
if (minLat > MIN_LAT && maxLat < MAX_LAT)
{
double deltaLon = Math.Asin(Math.Sin(radDist) /
Math.Cos(radLat));
minLon = radLon - deltaLon;
if (minLon < MIN_LON) minLon += 2d * Math.PI;
maxLon = radLon + deltaLon;
if (maxLon > MAX_LON) maxLon -= 2d * Math.PI;
}
else
{
// a pole is within the distance
minLat = Math.Max(minLat, MIN_LAT);
maxLat = Math.Min(maxLat, MAX_LAT);
minLon = MIN_LON;
maxLon = MAX_LON;
}
return new GeoLocation[]
{
FromRadians(minLat, minLon),
FromRadians(maxLat, maxLon)
};
}
public POICollection GetPOIList(double latitude, double longitude, int distance, DistanceType distanceType)
{
double calculatedDistance;
//convert it back to kilometers
switch (distanceType)
{
case DistanceType.Meters:
calculatedDistance = Convert.ToDouble((double)distance / 1000);
break;
case DistanceType.Miles:
calculatedDistance = distance / 0.621371192;
break;
default:
calculatedDistance = distance;
break;
}
GeoLocation myLocation = GeoLocation.FromDegrees(latitude, longitude);
GeoLocation[] coordinates = myLocation.BoundingCoordinates(calculatedDistance);
double north = coordinates[1].getLatitudeInDegrees();
double south = coordinates[0].getLatitudeInDegrees();
double east = coordinates[1].getLongitudeInDegrees();
double west = coordinates[0].getLongitudeInDegrees();
return(GetPOIList(north, south, east, west));
}