public void StandardShipEtasFromStLouisBay()
{
Position testPosition = ShipPositions.StLouisBay;
var ship = new ShipTest
{
Position = testPosition,
NavigationalStatus = NavigationalStatus.Underway,
CanalEntryTimestamp = DateTime.UtcNow.AddHours(-6),
Speed = 1
};
var directDistanceToDuluth = GeoHelper.DistanceBetweenCoord(Ports.Duluth, testPosition);
var shipSideDistance = directDistanceToDuluth * Math.Sin(60d.ToRadians());
var canalSideDistance = directDistanceToDuluth * Math.Cos(60d.ToRadians());
var totalDistance = shipSideDistance + canalSideDistance;
var expected = DateTime.UtcNow.AddHours(totalDistance / ship.Speed) + ShipTestProcessor.DataLag;
ship.Update();
// ReSharper disable once PossibleInvalidOperationException
Assert.IsTrue(expected > ship.DerivedEta.Value.AddSeconds(-1));
Assert.IsTrue(expected < ship.DerivedEta.Value.AddSeconds(1));
}
public void SuccessfulDistanceCalculationInNauticalMiles()
{
Assert.AreEqual(
GeoHelper.DistanceBetweenCoord(TestDestination, TestShipPosition, GeoHelper.Units.NauticalMiles),
ExpectedDistanceInNmi,
ExpectedDistanceInNmi * DeltaPercentage
);
}
public void SuccessfulDistanceCalculationInKilometers()
{
Assert.AreEqual(
GeoHelper.DistanceBetweenCoord(TestDestination, TestShipPosition, GeoHelper.Units.KiloMeter),
ExpectedDistanceInKm,
ExpectedDistanceInKm * DeltaPercentage
);
}
public void SuccessfulDistanceCalculationInMiles()
{
Assert.AreEqual(
GeoHelper.DistanceBetweenCoord(TestDestination, TestShipPosition),
ExpectedDistanceInMiles,
ExpectedDistanceInMiles * DeltaPercentage
);
}
/// <summary>
/// Ships in St. Louis bay have an Eta to Duluth calculated in a specific manner, based on triangulation from St. Louis Bay.
/// The method uses a 60/60/60 triangle between ship position and Duluth Canal position.
/// </summary>
/// <param name="shipPosition">The current coordinates of the ship.</param>
/// <param name="speed">The speed of the ship.</param>
/// <returns>The Eta of the ship to reach Duluth</returns>
private static DateTime CalculateEtaToDuluthFromStLouisBay(Position shipPosition, double speed)
{
//// first, calculate the direct distance to the canal and use it as the hypotenuse of a 30/60/90 triangle
var directLineDistance = GeoHelper.DistanceBetweenCoord(Ports.Duluth, shipPosition);
//// next, find lengths of the opposite and adjacent sides (convert angle to radians)
var shipSideDistance = directLineDistance * SinSixtyDegrees;
var canalSideDistance = directLineDistance * CosSixtyDegrees;
//// last, d=rt provides time to travel in hours
var totalDistance = shipSideDistance + canalSideDistance;
return(GetLagAdjustedDerivedEta(totalDistance, speed));
}
public void ShipEtasFromStandardLocations()
{
var testPosition = ShipPositions.DuluthSuperiorDeadZone;
var ship = new ShipTest
{
Position = testPosition,
NavigationalStatus = NavigationalStatus.Underway,
CanalEntryTimestamp = DateTime.UtcNow.AddHours(-6),
Speed = 1,
Heading = 280
};
var directDistanceToDuluth = GeoHelper.DistanceBetweenCoord(Ports.Duluth, testPosition);
var expected = DateTime.UtcNow.AddHours(directDistanceToDuluth / ship.Speed) + ShipTestProcessor.DataLag;
ship.Update();
// ReSharper disable once PossibleInvalidOperationException
Assert.IsTrue(expected > ship.DerivedEta.Value.AddSeconds(-1));
Assert.IsTrue(expected < ship.DerivedEta.Value.AddSeconds(1));
}
/// <summary>
/// This method calculates the Eta of a ship to Duluth.
/// </summary>
/// <param name="shipPosition">The current coordinates of the ship.</param>
/// <param name="speed">The speed of the ship.</param>
/// <returns>The Eta of the ship to reach Duluth</returns>
private static DateTime CalculateEtaToDuluth(Position shipPosition, double speed)
{
var directLineDistance = GeoHelper.DistanceBetweenCoord(Ports.Duluth, shipPosition);
return(GetLagAdjustedDerivedEta(directLineDistance, speed));
}
/// <summary>
/// Is a ship within 50 miles of the Duluth Canal?
/// </summary>
/// <param name="shipTest">shipTest object</param>
/// <returns>true or false</returns>
public static bool IsWithinFiftyMilesOfDuluth(this ShipTest shipTest)
{
return(GeoHelper.DistanceBetweenCoord(shipTest.Position, Ports.Duluth) <= 50);
}
