/// <summary>
/// Uses A*-algorithm to find the best route between two tiles.
/// </summary>
/// <param name="start">First tile to search from.</param>
/// <param name="goal">Goal to find.</param>
/// <param name="previous">Tile just before the first tile.</param>
/// <param name="forbidden">List of tiles that should be never used on route.</param>
/// <param name="sign">Optional function for building signs.</param>
/// <returns></returns>
internal static List <PathInfo> FindPath(TileIndex start, TileIndex goal, TileIndex previous, HashSet <TileIndex> forbidden = null, Action <TileIndex, string> sign = null)
{
// Nodes to evaluate
var tilesToProcess = new FibonacciHeap <TileIndex>();
tilesToProcess.Insert(start, 0);
// Nodes evaluated
var cameFrom = new Dictionary <TileIndex, PathInfo>();
cameFrom[start] = new PathInfo(start, 1, 0, BuildType.Basic, previous != null ? new PathInfo(previous, 1, 0, BuildType.Basic, null) : null);
while (tilesToProcess.Count() > 0)
{
var current = tilesToProcess.Pop();
//AILog.Info($"Processing: {Helper.FormatTile(current)}");
if (current == goal)
{
// We found the target.
return(RoadBuilder.BuildFinalPath(cameFrom[current]));
}
var neighbors = RoadBuilder.GetNeighbors(current, cameFrom[current]);
foreach (var neighborItem in neighbors)
{
var neighbor = neighborItem.Tile;
if ((neighbor == previous) || ((forbidden != null) && forbidden.Contains(neighbor)))
{
// We can't go here.
continue;
}
var neighborDist = neighborItem.Length;
if (!cameFrom.ContainsKey(neighbor))
{
tilesToProcess.Insert(neighbor, neighborItem.Cost);
}
else
{
if (neighborItem.Cost >= cameFrom[neighbor].Cost)
{
continue;
}
}
sign?.Invoke(neighbor, neighborItem.Cost.ToString());
cameFrom[neighbor] = neighborItem;
}
}
return(null);
}
protected override void Start()
{
AICompany.SetLoanAmount(0);
SignManager signManager = new SignManager();
TownNetwork tn = new TownNetwork();
try
{
AICompany.SetLoanAmount(AICompany.GetMaxLoanAmount());
AIRoad.SetCurrentRoadType(AIRoad.ROADTYPE_ROAD);
foreach (var edge in tn.Graph.Edges)
{
AILog.Info($"Build road from {edge.Node1.Name} to {edge.Node2.Name}.");
var stationInfo1 = tn.EnsureStation(edge.Node1);
var stationInfo2 = tn.EnsureStation(edge.Node2);
RoadBuilder.BuildRoad(
stationInfo1.tile,
stationInfo1.entryPoint,
stationInfo2.entryPoint,
stationInfo2.tile,
new HashSet <TileIndex>()
);
var depotInfo1 = tn.EnsureDepot(edge.Node1);
var depotInfo2 = tn.EnsureDepot(edge.Node2);
tn.MakeRoute(edge.Node1, edge.Node2);
tn.MakeRoute(edge.Node2, edge.Node1);
}
}
catch
{
}
Sleep(50);
signManager.ClearSigns();
var step = 0;
while (true)
{
// Main loop
//this.setMinLoan();
CsTestAi.SetMinimumLoanAmount();
tn.UpdateRoutes();
Sleep(100);
step++;
}
}
internal static bool BuildRoad(TileIndex previous, TileIndex from, TileIndex to, TileIndex next, HashSet <TileIndex> forbidden, Action <TileIndex, string> sign = null)
{
var path = RoadBuilder.FindPath(from, to, previous, forbidden);
if (path == null)
{
return(false);
}
for (var i = 0; i < path.Count - 1; i++)
{
var p = i == 0 ? next : path[i - 1].Tile;
var c = path[i].Tile;
var n = i == path.Count - 1 ? previous : path[i + 1].Tile;
var nt = i == 0 ? BuildType.Basic : path[i - 1].Type;
//sign(c, "[" + AIMap.GetTileX(c) + ", " + AIMap.GetTileY(c) + "] " + path[i].type);
bool good = false;
switch (path[i].Type)
{
case BuildType.Basic:
if (path[i].Length > 1)
{
AILog.Error($"Length is: {path[i].Length}. ([" + AIMap.GetTileX(p) + ", " + AIMap.GetTileY(p) + "] via [" + AIMap.GetTileX(c) + ", " + AIMap.GetTileY(c) + "] to [" + AIMap.GetTileX(n) + ", " + AIMap.GetTileY(n) + "])");
continue;
//throw new Exception("Should not be Road");
}
if (nt != BuildType.Basic)
{
continue;
}
//AILog.Info("Build a Road from [" + AIMap.GetTileX(p) + ", " + AIMap.GetTileY(p) + "] via [" + AIMap.GetTileX(c) + ", " + AIMap.GetTileY(c) + "] to [" + AIMap.GetTileX(n) + ", " + AIMap.GetTileY(n) + "].");
good = AIRoad.BuildRoad(p, c);
good = AIRoad.BuildRoad(c, n);
break;
case BuildType.Bridge:
var bridgeTypes = new AIBridgeList_Length(path[i].Length);
//AILog.Info("Build a bridge " + bridgeTypes.Begin() + " from [" + AIMap.GetTileX(c) + ", " + AIMap.GetTileY(c) + "] to [" + AIMap.GetTileX(n) + ", " + AIMap.GetTileY(n) + "].");
good = AIBridge.BuildBridge(AIVehicle.VT_ROAD, bridgeTypes.Begin(), c, n);
if ((!good) && (sign != null))
{
sign(p, "s");
sign(c, "e");
}
break;
case BuildType.Tunnel:
throw new Exception("Tunnels not supported");
}
if (!good)
{
var reason = AIError.GetLastErrorString();
if (reason != "ERR_ALREADY_BUILT")
{
AILog.Error("Failed to build on [" + AIMap.GetTileX(c) + ", " + AIMap.GetTileY(c) + "]. Reason: " + reason);
}
}
}
return(true);
}
