public IEnumerable <ScooterLocation> GetBy(
int scootersNumber,
int searchingRadiusKilometer,
float landmarkLongitude,
float landmarkLatitude)
{
int earthRadiusKilometer = 6371;
var radiansLongitude = GeoLocationHelper.ConvertDegreesToRadians(landmarkLongitude);
var radiansLatitude = GeoLocationHelper.ConvertDegreesToRadians(landmarkLatitude);
// The great circle distance
// d = acos(sin(lat1)*sin(lat2)+cos(lat1)*cos(lat2)*cos(lon1-lon2))
return(_context.ScooterLocations
.Select(location => new
{
Location = location,
Distance = earthRadiusKilometer *
Math.Acos(
Math.Sin(radiansLatitude) * Math.Sin(location.RadiansLatitude)
+
(
Math.Cos(radiansLatitude) * Math.Cos(location.RadiansLatitude)
* Math.Cos(radiansLongitude - location.RadiansLongitude)
)
),
})
.Where(location => location.Distance < searchingRadiusKilometer)
.OrderBy(location => location.Distance)
.Take(scootersNumber)
.Select(s => s.Location));
}
public void Seed(IServiceProvider serviceProvider)
{
var polygonService = serviceProvider.GetService <PolygonService>();
var cityMapService = serviceProvider.GetService <ICityMapService>();
var context = serviceProvider.GetService <MobilityDbContext>();
var cityPolygons = cityMapService.GetPolygonPoints();
var points = polygonService.GetRandomPointsInsidePolygon(
cityPolygons,
_scooterNumbersToGenerate);
foreach (Point point in points)
{
context.ScooterLocations.Add(new ScooterLocation
{
Longitude = point.X,
Latitude = point.Y,
RadiansLongitude = (float)GeoLocationHelper.ConvertDegreesToRadians(point.X),
RadiansLatitude = (float)GeoLocationHelper.ConvertDegreesToRadians(point.Y)
});
}
context.SaveChanges();
}