/// <summary>
/// Try to move the given loc to a new block.
/// </summary>
/// <returns>True if the loc has moved, false if there are no routes available.</returns>
private bool MoveLoc(FutureAlternativeSet genSet, ILocState loc)
{
// Get possible routes
var currentBlock = state.GetCurrentBlock(loc);
var currentBlockEnterSide = state.GetCurrentBlockEnterSide(loc);
var locDirection = currentBlockEnterSide.Invert();
var avoidDirectionChanges = (loc.ChangeDirection == ChangeDirection.Avoid);
var routeFromFromBlock = state.RailwayState.GetAllPossibleNonClosedRoutesFromBlock(currentBlock);
var routeOptions = routeFromFromBlock.Select(x => state.IsAvailableFor(x, loc, locDirection, avoidDirectionChanges, 0)).ToList();
var possibleRoutes = routeOptions.Where(x => x.IsPossible).Select(x => x.Route).ToList();
// If no routes, then return
if (!possibleRoutes.Any())
{
return(false);
}
if (possibleRoutes.Count > 1)
{
// Create alternate generations
foreach (var route in possibleRoutes.Skip(1))
{
var alternateState = new FutureRouteAvailabilityTester(state);
alternateState.TakeRoute(route, loc);
genSet.Add(new FutureAlternative(alternateState, generation));
}
}
// Take the first route
var firstRoute = possibleRoutes[0];
state.TakeRoute(firstRoute, loc);
return(true);
}