Pathfinding across rooms introduces some extra complications compared to pathfinding within a room.
Exit tiles, for example, have special “adjacency rules.” If you move DOWN from RoomPosition(25, 48, W1N2) you don’t end up at RoomPosition(25, 49, W1N2) - you’re at RoomPosition(25, 0, W1N1)! But if you move UP from RoomPosition(25, 49, W1N2), you arrive at RoomPosition(25, 48, W1N2).
Similarly, moving RIGHT from RoomPosition(25, 49, W1N2) takes you to RoomPosition(26, 49, W1N1).
If a creep remains on an exit tile without moving, it switches to the corresponding exit tile of the adjacent room. While pathing, this usually won’t be a problem, as there’s no fatigue cost to travel through exit tiles. But if the creep’s path is blocked, it might find itself “kicked off” its path when it rotates to the other room.
We’ll have to account for this when determining if a creep is “adjacent to the path” to find the next point on the path.