/// <summary>
/// Select one of the given possible routes.
/// Returns null if no route should be taken.
/// </summary>
/// <param name="possibleRoutes">A list of routes to choose from</param>
/// <param name="loc">The loc to choose for</param>
/// <param name="fromBlock">The block from which the next route will leave</param>
/// <param name="locDirection">The direction the loc is facing in the <see cref="fromBlock"/>.</param>
public IRouteState SelectRoute(IList <IRouteState> possibleRoutes, ILocState loc, IBlockState fromBlock, BlockSide locDirection)
{
// Look for a direct match
var directRoutes = possibleRoutes.Where(x => x.To == targetBlock).ToList();
if (directRoutes.Any())
{
return(new DefaultRouteSelector().SelectRoute(directRoutes, loc, fromBlock, locDirection));
}
// Look for routes that get us closer to the target block.
var sequences = FindRouteSequences(fromBlock, locDirection.Invert(), targetBlock).ToList();
// Filter sequences to start with possible routes
var possibleSequences = sequences.Where(x => possibleRoutes.Contains(x.First)).OrderBy(x => x.Length).ToList();
// Any sequences left?
if (possibleSequences.Count == 0)
{
return(null);
}
// Take the first possible sequence.
return(possibleSequences[0].First);
}
/// <summary>
/// Find all route sequences that lead from the given side of the given "from" block to the given "to" block.
/// </summary>
public static IEnumerable <IRouteSequence> FindRouteSequences(IBlockState fromBlock, BlockSide fromBlockEnterSide, IBlockState toBlock)
{
var railway = fromBlock.RailwayState;
var fromBlockLeaveSide = fromBlockEnterSide.Invert();
var startRoutes = railway.RouteStates.Where(x => (x.From == fromBlock) && (x.FromBlockSide == fromBlockLeaveSide)).ToList();
var initialSequences = startRoutes.Select(x => new RouteSequence(x));
return(FindRouteSequences(initialSequences, railway, toBlock, railway.RouteStates.Count));
}
/// <summary>
/// Default ctor
/// </summary>
public Item(ILocState loc, IBlockState block, BlockSide currentBlockEnterSide, LocDirection direction)
{
this.loc = loc;
this.block = block;
this.currentBlockEnterSide = currentBlockEnterSide;
this.direction = direction;
Checked = true;
Text = loc.Description;
var facingText = (currentBlockEnterSide.Invert() == BlockSide.Front) ? Strings.FacingFrontOfBlock : Strings.FacingBackOfBlock;
SubItems.Add(string.Format(Strings.XFacingY, block.Description, facingText));
SubItems.Add(direction == LocDirection.Forward ? "Forward" : "Reverse");
}
/// <summary>
/// Assign the current loc to the selected block facing the given side.
/// </summary>
private void Assign(BlockSide side)
{
var block = SelectedBlock;
if ((loc != null) && (block != null))
{
var task = Task <bool> .Factory.StartNew(() => loc.AssignTo(block, side.Invert()));
task.ContinueWith(t => {
if (t.Result)
{
UpdateBlocks();
UpdateControls();
}
else
{
var msg = string.Format("Cannot lock block '{0}'", block);
MessageBox.Show(msg, Strings.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}, TaskScheduler.FromCurrentSynchronizationContext());
}
}