/// <summary>
/// Prompts the user for a QP.
/// </summary>
/// <param name="qp">Output parameter for the QP.</param>
/// <param name="periods">Output parameter for the periods of the QP.</param>
/// <param name="fixedPoint">Output parameter for the fixed-point of the QP (or
/// <see langword="null"/> if there is none).</param>
/// <returns><see langword="true"/> if the user specified a QP;
/// <see langword="false"/> otherwise.</returns>
private bool TryGetQP(
out QuiverWithPotential <int> qp,
out IEnumerable <IEnumerable <int> > periods,
out int?fixedPoint)
{
if (!TryGetQPType(out var qpType) || !TryGetNumPeriods(qpType, out int numPeriods))
{
qp = null;
periods = null;
fixedPoint = null;
return(false);
}
switch (qpType)
{
case QPType.OddFlower:
qp = UsefulQPs.GetOddFlowerQP(numPeriods, DefaultFirstVertex);
periods = UsefulQPs.GetPeriodsOfOddFlowerQP(numPeriods, DefaultFirstVertex);
fixedPoint = null;
break;
case QPType.EvenFlowerType1:
qp = UsefulQPs.GetEvenFlowerType1QP(numPeriods, DefaultFirstVertex);
periods = UsefulQPs.GetPeriodsOfEvenFlowerType1QP(numPeriods, DefaultFirstVertex);
fixedPoint = null;
break;
case QPType.EvenFlowerType2:
qp = UsefulQPs.GetEvenFlowerType2QP(numPeriods, DefaultFirstVertex);
periods = UsefulQPs.GetPeriodsOfEvenFlowerType2QP(numPeriods, DefaultFirstVertex);
fixedPoint = null;
break;
case QPType.PointedFlower:
qp = UsefulQPs.GetPointedFlowerQP(numPeriods, DefaultFirstVertex);
periods = UsefulQPs.GetPeriodsOfPointedFlowerQPWithoutFixedPoint(numPeriods, DefaultFirstVertex);
throw new NotImplementedException();
break;
default:
Debug.Fail($"Invalid QP type ({qpType}) specified.");
qp = null;
periods = null;
fixedPoint = null;
return(false);
}
return(true);
}
public void GetPeriodsOfEvenFlowerType2QP_Works(int numVerticesInCenterPolygon, int firstVertex, IEnumerable <IEnumerable <int> > expectedPeriods)
{
var actualPeriods = UsefulQPs.GetPeriodsOfEvenFlowerType2QP(numVerticesInCenterPolygon, firstVertex);
Assert.That(actualPeriods, Is.EqualTo(expectedPeriods));
}
public void GetPeriodsOfEvenFlowerType2QP_ThrowsArgumentOutOfRangeException_OnBadNumberOfVerticesInCenterPolygon(int numVerticesInCenterPolygon, int firstVertex)
{
Assert.That(() => UsefulQPs.GetPeriodsOfEvenFlowerType2QP(numVerticesInCenterPolygon, firstVertex), Throws.InstanceOf <ArgumentOutOfRangeException>());
}