private Location GetLocation(List <Satellite> satellites)
{
Point p1 = new Point(satellites[0].Location.X, satellites[0].Location.Y, satellites[0].ReceivedMessage.Distance);
Point p2 = new Point(satellites[1].Location.X, satellites[1].Location.Y, satellites[1].ReceivedMessage.Distance);
Point p3 = new Point(satellites[2].Location.X, satellites[2].Location.Y, satellites[2].ReceivedMessage.Distance);
Point a = Trilateration.Compute(p1, p2, p3);
return(new Location(a.X, a.Y));
}
public void TestTrilaterationCompute()
{
Point p1 = new Point(0, 3, 4);
Point p2 = new Point(0, 0, 5);
Point p3 = new Point(4, 0, 3);
Point expected = new Point(4, 3);
Point actual = Trilateration.Compute(p1, p2, p3);
Assert.AreEqual(expected.X, actual.X);
Assert.AreEqual(expected.Y, actual.Y);
}
public Position GetLocation(List <AddSatelliteObject> satelliteList)
{
foreach (var satellite in satelliteList)
{
var satInfo = satellitesInformation.FirstOrDefault(x => x.Name == satellite.Name);
if (satInfo != null)
{
pointList.Add(new Point(satInfo.PositionX, satInfo.PositionY, satellite.Distance));
}
}
var position =
Trilateration.Compute(pointList.ElementAt(0), pointList.ElementAt(1), pointList.ElementAt(2));
if (position != null)
{
return(new Position(position[0], position[1]));
}
return(null);
}
public async Task <Result <ShipResponse> > Handle(Command request, CancellationToken cancellationToken)
{
List <string> messageItems = new List <string>();
//Iterate for each satellite in order to update data and process the message to decode
foreach (var satellite in request.Satellites)
{
var satelliteFromDb = await context.Satellites.Where(x => x.Name == satellite.Name).FirstOrDefaultAsync(cancellationToken: cancellationToken);
if (satelliteFromDb == null)
{
return(Result <ShipResponse> .Failure(string.Format("Failed to find a satellite named '{0}'", satellite.Name)));
}
satelliteFromDb.Distance = satellite.Distance;
satelliteFromDb.LastUpdatedDate = DateTime.Now;
if (satellite.Message != null && satellite.Message.Count > 0)
{
satelliteFromDb.Message = satellite.Message;
if (messageItems.Count == 0)
{
for (int c = 0; c < satellite.Message.Count; c++)
{
messageItems.Add("");
}
}
for (int c = 0; c < satellite.Message.Count; c++)
{
if (satellite.Message[c] != string.Empty)
{
var itemFound = messageItems.IndexOf(satellite.Message[c]);
if (itemFound == -1)
{
messageItems[c] = satellite.Message[c];
}
}
}
}
}
messageItems.RemoveAll(x => string.IsNullOrWhiteSpace(x));
//Save changes
await context.SaveChangesAsync(cancellationToken);
var satellites = await context.Satellites.ToListAsync(cancellationToken : cancellationToken);
//Process the response
var shipResponse = new ShipResponse();
//Calculate Ship Position by Trilateration
double[] position = Trilateration.Compute(new Point(satellites[0].Y, satellites[0].X, satellites[0].Distance),
new Point(satellites[1].Y, satellites[1].X, satellites[1].Distance),
new Point(satellites[2].Y, satellites[2].X, satellites[2].Distance));
if (position == null || messageItems.Count == 0)
{
return(Result <ShipResponse> .Success(null));
}
shipResponse.Position = new Position {
Y = Math.Round(position[0], 2), X = Math.Round(position[1], 2)
};
shipResponse.Message = string.Join(" ", messageItems);
return(Result <ShipResponse> .Success(shipResponse));
}
