/// <summary>
/// Computes the aspects object shown in rear of this one, assuming an unblocked straight route.
/// </summary>
/// <param name="divergenceLookahead">How far ahead to consider divergences.</param>
/// <returns>The aspects in rear of this one.</returns>
public Aspects NextInRear(EDivergenceLookahead divergenceLookahead)
{
switch (Type)
{
case EAspectsType.Red:
case EAspectsType.AllLunar:
case EAspectsType.OneLunar:
return(new Aspects(EAspectsType.Yellow, 0));
case EAspectsType.Yellow:
return(new Aspects(EAspectsType.FlashingYellow, 0));
case EAspectsType.FlashingYellow:
case EAspectsType.Green:
return(new Aspects(EAspectsType.Green, 0));
case EAspectsType.RedOverYellow:
return(new Aspects((divergenceLookahead != EDivergenceLookahead.Short) ? EAspectsType.YellowOverYellow : EAspectsType.FlashingYellow, IdentifiedHead));
case EAspectsType.RedOverFlashingYellow:
return(new Aspects((divergenceLookahead != EDivergenceLookahead.Short) ? EAspectsType.YellowOverYellow : EAspectsType.Green, IdentifiedHead));
case EAspectsType.RedOverGreen:
return(new Aspects((divergenceLookahead != EDivergenceLookahead.Short) ? EAspectsType.YellowOverGreen : EAspectsType.Green, IdentifiedHead));
case EAspectsType.YellowOverYellow:
case EAspectsType.YellowOverGreen:
return(new Aspects((divergenceLookahead == EDivergenceLookahead.Long) ? EAspectsType.FlashingYellow : EAspectsType.Green, 0));
}
return(new Aspects(EAspectsType.Red, 0));
}
/// <summary>
/// Constructs a new Signal.
/// </summary>
/// <param name="subArea">Which sub-area contains this signal.</param>
/// <param name="id">The ID number of the signal.</param>
/// <param name="heads">The number of heads (lamps) in this signal.</param>
protected Signal(ushort subArea, short id, byte heads, EDivergenceLookahead divergenceLookahead)
{
Debug.Assert(subArea >= 0);
SubArea = subArea;
ID = id;
Heads = heads;
DivergenceLookahead = divergenceLookahead;
}
