public TrainTrack Parse(XYCoord coord, char input)
{
TrainTrack trackNorth;
TrainTrack trackWest;
AllPositions.TryGetValue(new XYCoord(coord.X, coord.Y - 1), out trackNorth);
AllPositions.TryGetValue(new XYCoord(coord.X - 1, coord.Y), out trackWest);
TrainTrack newTrack = null;
switch (input)
{
case '|': newTrack = new NorthSouth(coord, trackNorth); break;
case '\\': newTrack = new Corner(coord, trackNorth, trackWest); break;
case '/': newTrack = new Corner(coord, trackNorth, trackWest); break;
case '-': newTrack = new EastWest(coord, trackWest); break;
case '+': newTrack = new Intersection(coord, trackNorth, trackWest); break;
}
AllPositions.Add(coord, newTrack);
return(newTrack);
}
private void Parse(TrackFactory factory, int x, int y, char input)
{
var coord = new XYCoord(x, y);
Cart cart = null;
TrainTrack track = null;
switch (input)
{
case '<': cart = new Cart(coord, Direction.West); input = '-'; break;
case '>': cart = new Cart(coord, Direction.East); input = '-'; break;
case '^': cart = new Cart(coord, Direction.North); input = '|'; break;
case 'v': cart = new Cart(coord, Direction.South); input = '|'; break;
}
if (input != ' ')
{
track = factory.Parse(coord, input);
}
if (cart != null)
{
Carts.Add(cart);
cart.track = track;
}
}
public void Link(TrainTrack track, Direction direction, bool backLink)
{
Neighbours[direction] = track;
if (backLink)
{
track.Link(this, direction.Opposite(), false);
}
}
public Corner(XYCoord coord, TrainTrack north, TrainTrack west) : base(coord, north, west)
{
if (west is EastWest || west is Intersection)
{
Link(west, Direction.West, true); HasWest = true;
}
if (north is NorthSouth || north is Intersection)
{
Link(north, Direction.North, true); HasNorth = true;
}
}
public TrainTrack(XYCoord coord, TrainTrack north, TrainTrack west)
{
this.coord = coord;
Neighbours = new Dictionary <Direction, TrainTrack>();
if (north != null)
{
Link(north, Direction.North, true);
}
if (west != null)
{
Link(west, Direction.West, true);
}
}
public Intersection(XYCoord coord, TrainTrack north, TrainTrack west) : base(coord, north, west)
{
}
public EastWest(XYCoord coord, TrainTrack west) : base(coord, null, west)
{
}
public NorthSouth(XYCoord coord, TrainTrack north) : base(coord, north, null)
{
}