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-/* $Id$ */
-
-/**
- * A Rail Pathfinder.
- */
-class Rail
-{
- _aystar_class = import("graph.aystar", "", 4);
- _max_cost = null; ///< The maximum cost for a route.
- _cost_tile = null; ///< The cost for a single tile.
- _cost_diagonal_tile = null; ///< The cost for a diagonal tile.
- _cost_turn = null; ///< The cost that is added to _cost_tile if the direction changes.
- _cost_slope = null; ///< The extra cost if a rail tile is sloped.
- _cost_bridge_per_tile = null; ///< The cost per tile of a new bridge, this is added to _cost_tile.
- _cost_tunnel_per_tile = null; ///< The cost per tile of a new tunnel, this is added to _cost_tile.
- _cost_coast = null; ///< The extra cost for a coast tile.
- _pathfinder = null; ///< A reference to the used AyStar object.
- _max_bridge_length = null; ///< The maximum length of a bridge that will be build.
- _max_tunnel_length = null; ///< The maximum length of a tunnel that will be build.
-
- cost = null; ///< Used to change the costs.
- _running = null;
- _goals = null;
-
- constructor()
- {
- this._max_cost = 10000000;
- this._cost_tile = 100;
- this._cost_diagonal_tile = 70;
- this._cost_turn = 50;
- this._cost_slope = 100;
- this._cost_bridge_per_tile = 150;
- this._cost_tunnel_per_tile = 120;
- this._cost_coast = 20;
- this._max_bridge_length = 6;
- this._max_tunnel_length = 6;
- this._pathfinder = this._aystar_class(this._Cost, this._Estimate, this._Neighbours, this._CheckDirection, this, this, this, this);
-
- this.cost = this.Cost(this);
- this._running = false;
- }
-
- /**
- * Initialize a path search between sources and goals.
- * @param sources The source tiles.
- * @param goals The target tiles.
- * @param ignored_tiles An array of tiles that cannot occur in the final path.
- * @see AyStar::InitializePath()
- */
- function InitializePath(sources, goals, ignored_tiles = []) {
- local nsources = [];
-
- foreach (node in sources) {
- local path = this._pathfinder.Path(null, node[1], 0xFF, this._Cost, this);
- path = this._pathfinder.Path(path, node[0], 0xFF, this._Cost, this);
- nsources.push(path);
- }
- this._goals = goals;
- this._pathfinder.InitializePath(nsources, goals, ignored_tiles);
- }
-
- /**
- * Try to find the path as indicated with InitializePath with the lowest cost.
- * @param iterations After how many iterations it should abort for a moment.
- * This value should either be -1 for infinite, or > 0. Any other value
- * aborts immediatly and will never find a path.
- * @return A route if one was found, or false if the amount of iterations was
- * reached, or null if no path was found.
- * You can call this function over and over as long as it returns false,
- * which is an indication it is not yet done looking for a route.
- * @see AyStar::FindPath()
- */
- function FindPath(iterations);
-};
-
-class Rail.Cost
-{
- _main = null;
-
- function _set(idx, val)
- {
- if (this._main._running) throw("You are not allowed to change parameters of a running pathfinder.");
-
- switch (idx) {
- case "max_cost": this._main._max_cost = val; break;
- case "tile": this._main._cost_tile = val; break;
- case "diagonal_tile": this._cost_diagonal_tile = val; break;
- case "turn": this._main._cost_turn = val; break;
- case "slope": this._main._cost_slope = val; break;
- case "bridge_per_tile": this._main._cost_bridge_per_tile = val; break;
- case "tunnel_per_tile": this._main._cost_tunnel_per_tile = val; break;
- case "coast": this._main._cost_coast = val; break;
- case "max_bridge_length": this._main._max_bridge_length = val; break;
- case "max_tunnel_length": this._main._max_tunnel_length = val; break;
- default: throw("the index '" + idx + "' does not exist");
- }
-
- return val;
- }
-
- function _get(idx)
- {
- switch (idx) {
- case "max_cost": return this._main._max_cost;
- case "tile": return this._main._cost_tile;
- case "diagonal_tile": return this._cost_diagonal_tile;
- case "turn": return this._main._cost_turn;
- case "slope": return this._main._cost_slope;
- case "bridge_per_tile": return this._main._cost_bridge_per_tile;
- case "tunnel_per_tile": return this._main._cost_tunnel_per_tile;
- case "coast": return this._main._cost_coast;
- case "max_bridge_length": return this._main._max_bridge_length;
- case "max_tunnel_length": return this._main._max_tunnel_length;
- default: throw("the index '" + idx + "' does not exist");
- }
- }
-
- constructor(main)
- {
- this._main = main;
- }
-};
-
-function Rail::FindPath(iterations)
-{
- local test_mode = AITestMode();
- local ret = this._pathfinder.FindPath(iterations);
- this._running = (ret == false) ? true : false;
- if (!this._running && ret != null) {
- foreach (goal in this._goals) {
- if (goal[0] == ret.GetTile()) {
- return this._pathfinder.Path(ret, goal[1], 0, this._Cost, this);
- }
- }
- }
- return ret;
-}
-
-function Rail::_GetBridgeNumSlopes(end_a, end_b)
-{
- local slopes = 0;
- local direction = (end_b - end_a) / AIMap.DistanceManhattan(end_a, end_b);
- local slope = AITile.GetSlope(end_a);
- if (!((slope == AITile.SLOPE_NE && direction == 1) || (slope == AITile.SLOPE_SE && direction == -AIMap.GetMapSizeX()) ||
- (slope == AITile.SLOPE_SW && direction == -1) || (slope == AITile.SLOPE_NW && direction == AIMap.GetMapSizeX()) ||
- slope == AITile.SLOPE_N || slope == AITile.SLOPE_E || slope == AITile.SLOPE_S || slope == AITile.SLOPE_W)) {
- slopes++;
- }
-
- local slope = AITile.GetSlope(end_b);
- direction = -direction;
- if (!((slope == AITile.SLOPE_NE && direction == 1) || (slope == AITile.SLOPE_SE && direction == -AIMap.GetMapSizeX()) ||
- (slope == AITile.SLOPE_SW && direction == -1) || (slope == AITile.SLOPE_NW && direction == AIMap.GetMapSizeX()) ||
- slope == AITile.SLOPE_N || slope == AITile.SLOPE_E || slope == AITile.SLOPE_S || slope == AITile.SLOPE_W)) {
- slopes++;
- }
- return slopes;
-}
-
-function Rail::_nonzero(a, b)
-{
- return a != 0 ? a : b;
-}
-
-function Rail::_Cost(path, new_tile, new_direction, self)
-{
- /* path == null means this is the first node of a path, so the cost is 0. */
- if (path == null) return 0;
-
- local prev_tile = path.GetTile();
-
- /* If the new tile is a bridge / tunnel tile, check whether we came from the other
- * end of the bridge / tunnel or if we just entered the bridge / tunnel. */
- if (AIBridge.IsBridgeTile(new_tile)) {
- if (AIBridge.GetOtherBridgeEnd(new_tile) != prev_tile) {
- local cost = path.GetCost() + self._cost_tile;
- if (path.GetParent() != null && path.GetParent().GetTile() - prev_tile != prev_tile - new_tile) cost += self._cost_turn;
- return cost;
- }
- return path.GetCost() + AIMap.DistanceManhattan(new_tile, prev_tile) * self._cost_tile + self._GetBridgeNumSlopes(new_tile, prev_tile) * self._cost_slope;
- }
- if (AITunnel.IsTunnelTile(new_tile)) {
- if (AITunnel.GetOtherTunnelEnd(new_tile) != prev_tile) {
- local cost = path.GetCost() + self._cost_tile;
- if (path.GetParent() != null && path.GetParent().GetTile() - prev_tile != prev_tile - new_tile) cost += self._cost_turn;
- return cost;
- }
- return path.GetCost() + AIMap.DistanceManhattan(new_tile, prev_tile) * self._cost_tile;
- }
-
- /* If the two tiles are more then 1 tile apart, the pathfinder wants a bridge or tunnel
- * to be build. It isn't an existing bridge / tunnel, as that case is already handled. */
- if (AIMap.DistanceManhattan(new_tile, prev_tile) > 1) {
- /* Check if we should build a bridge or a tunnel. */
- local cost = path.GetCost();
- if (AITunnel.GetOtherTunnelEnd(new_tile) == prev_tile) {
- cost += AIMap.DistanceManhattan(new_tile, prev_tile) * (self._cost_tile + self._cost_tunnel_per_tile);
- } else {
- cost += AIMap.DistanceManhattan(new_tile, prev_tile) * (self._cost_tile + self._cost_bridge_per_tile) + self._GetBridgeNumSlopes(new_tile, prev_tile) * self._cost_slope;
- }
- if (path.GetParent() != null && path.GetParent().GetParent() != null &&
- path.GetParent().GetParent().GetTile() - path.GetParent().GetTile() != max(AIMap.GetTileX(prev_tile) - AIMap.GetTileX(new_tile), AIMap.GetTileY(prev_tile) - AIMap.GetTileY(new_tile)) / AIMap.DistanceManhattan(new_tile, prev_tile)) {
- cost += self._cost_turn;
- }
- return cost;
- }
-
- /* Check for a turn. We do this by substracting the TileID of the current
- * node from the TileID of the previous node and comparing that to the
- * difference between the tile before the previous node and the node before
- * that. */
- local cost = self._cost_tile;
- if (path.GetParent() != null && AIMap.DistanceManhattan(path.GetParent().GetTile(), prev_tile) == 1 && path.GetParent().GetTile() - prev_tile != prev_tile - new_tile) cost = self._cost_diagonal_tile;
- if (path.GetParent() != null && path.GetParent().GetParent() != null &&
- AIMap.DistanceManhattan(new_tile, path.GetParent().GetParent().GetTile()) == 3 &&
- path.GetParent().GetParent().GetTile() - path.GetParent().GetTile() != prev_tile - new_tile) {
- cost += self._cost_turn;
- }
-
- /* Check if the new tile is a coast tile. */
- if (AITile.IsCoastTile(new_tile)) {
- cost += self._cost_coast;
- }
-
- /* Check if the last tile was sloped. */
- if (path.GetParent() != null && !AIBridge.IsBridgeTile(prev_tile) && !AITunnel.IsTunnelTile(prev_tile) &&
- self._IsSlopedRail(path.GetParent().GetTile(), prev_tile, new_tile)) {
- cost += self._cost_slope;
- }
-
- /* We don't use already existing rail, so the following code is unused. It
- * assigns if no rail exists along the route. */
- /*
- if (path.GetParent() != null && !AIRail.AreTilesConnected(path.GetParent().GetTile(), prev_tile, new_tile)) {
- cost += self._cost_no_existing_rail;
- }
- */
-
- return path.GetCost() + cost;
-}
-
-function Rail::_Estimate(cur_tile, cur_direction, goal_tiles, self)
-{
- local min_cost = self._max_cost;
- /* As estimate we multiply the lowest possible cost for a single tile with
- * with the minimum number of tiles we need to traverse. */
- foreach (tile in goal_tiles) {
- local dx = abs(AIMap.GetTileX(cur_tile) - AIMap.GetTileX(tile[0]));
- local dy = abs(AIMap.GetTileY(cur_tile) - AIMap.GetTileY(tile[0]));
- min_cost = min(min_cost, min(dx, dy) * self._cost_diagonal_tile * 2 + (max(dx, dy) - min(dx, dy)) * self._cost_tile);
- }
- return min_cost;
-}
-
-function Rail::_Neighbours(path, cur_node, self)
-{
- if (AITile.HasTransportType(cur_node, AITile.TRANSPORT_RAIL)) return [];
- /* self._max_cost is the maximum path cost, if we go over it, the path isn't valid. */
- if (path.GetCost() >= self._max_cost) return [];
- local tiles = [];
- local offsets = [AIMap.GetTileIndex(0, 1), AIMap.GetTileIndex(0, -1),
- AIMap.GetTileIndex(1, 0), AIMap.GetTileIndex(-1, 0)];
-
- /* Check if the current tile is part of a bridge or tunnel. */
- if (AIBridge.IsBridgeTile(cur_node) || AITunnel.IsTunnelTile(cur_node)) {
- /* We don't use existing rails, so neither existing bridges / tunnels. */
- } else if (path.GetParent() != null && AIMap.DistanceManhattan(cur_node, path.GetParent().GetTile()) > 1) {
- local other_end = path.GetParent().GetTile();
- local next_tile = cur_node + (cur_node - other_end) / AIMap.DistanceManhattan(cur_node, other_end);
- foreach (offset in offsets) {
- if (AIRail.BuildRail(cur_node, next_tile, next_tile + offset)) {
- tiles.push([next_tile, self._GetDirection(other_end, cur_node, next_tile, true)]);
- }
- }
- } else {
- /* Check all tiles adjacent to the current tile. */
- foreach (offset in offsets) {
- local next_tile = cur_node + offset;
- /* Don't turn back */
- if (path.GetParent() != null && next_tile == path.GetParent().GetTile()) continue;
- /* Disallow 90 degree turns */
- if (path.GetParent() != null && path.GetParent().GetParent() != null &&
- next_tile - cur_node == path.GetParent().GetParent().GetTile() - path.GetParent().GetTile()) continue;
- /* We add them to the to the neighbours-list if we can build a rail to
- * them and no rail exists there. */
- if ((path.GetParent() == null || AIRail.BuildRail(path.GetParent().GetTile(), cur_node, next_tile))) {
- if (path.GetParent() != null) {
- tiles.push([next_tile, self._GetDirection(path.GetParent().GetTile(), cur_node, next_tile, false)]);
- } else {
- tiles.push([next_tile, self._GetDirection(null, cur_node, next_tile, false)]);
- }
- }
- }
- if (path.GetParent() != null && path.GetParent().GetParent() != null) {
- local bridges = self._GetTunnelsBridges(path.GetParent().GetTile(), cur_node, self._GetDirection(path.GetParent().GetParent().GetTile(), path.GetParent().GetTile(), cur_node, true));
- foreach (tile in bridges) {
- tiles.push(tile);
- }
- }
- }
- return tiles;
-}
-
-function Rail::_CheckDirection(tile, existing_direction, new_direction, self)
-{
- return false;
-}
-
-function Rail::_dir(from, to)
-{
- if (from - to == 1) return 0;
- if (from - to == -1) return 1;
- if (from - to == AIMap.GetMapSizeX()) return 2;
- if (from - to == -AIMap.GetMapSizeX()) return 3;
- throw("Shouldn't come here in _dir");
-}
-
-function Rail::_GetDirection(pre_from, from, to, is_bridge)
-{
- if (is_bridge) {
- if (from - to == 1) return 1;
- if (from - to == -1) return 2;
- if (from - to == AIMap.GetMapSizeX()) return 4;
- if (from - to == -AIMap.GetMapSizeX()) return 8;
- }
- return 1 << (4 + (pre_from == null ? 0 : 4 * this._dir(pre_from, from)) + this._dir(from, to));
-}
-
-/**
- * Get a list of all bridges and tunnels that can be build from the
- * current tile. Bridges will only be build starting on non-flat tiles
- * for performance reasons. Tunnels will only be build if no terraforming
- * is needed on both ends.
- */
-function Rail::_GetTunnelsBridges(last_node, cur_node, bridge_dir)
-{
- local slope = AITile.GetSlope(cur_node);
- if (slope == AITile.SLOPE_FLAT && AITile.IsBuildable(cur_node + (cur_node - last_node))) return [];
- local tiles = [];
-
- for (local i = 2; i < this._max_bridge_length; i++) {
- local bridge_list = AIBridgeList_Length(i + 1);
- local target = cur_node + i * (cur_node - last_node);
- if (!bridge_list.IsEmpty() && AIBridge.BuildBridge(AIVehicle.VT_RAIL, bridge_list.Begin(), cur_node, target)) {
- tiles.push([target, bridge_dir]);
- }
- }
-
- if (slope != AITile.SLOPE_SW && slope != AITile.SLOPE_NW && slope != AITile.SLOPE_SE && slope != AITile.SLOPE_NE) return tiles;
- local other_tunnel_end = AITunnel.GetOtherTunnelEnd(cur_node);
- if (!AIMap.IsValidTile(other_tunnel_end)) return tiles;
-
- local tunnel_length = AIMap.DistanceManhattan(cur_node, other_tunnel_end);
- local prev_tile = cur_node + (cur_node - other_tunnel_end) / tunnel_length;
- if (AITunnel.GetOtherTunnelEnd(other_tunnel_end) == cur_node && tunnel_length >= 2 &&
- prev_tile == last_node && tunnel_length < _max_tunnel_length && AITunnel.BuildTunnel(AIVehicle.VT_RAIL, cur_node)) {
- tiles.push([other_tunnel_end, bridge_dir]);
- }
- return tiles;
-}
-
-function Rail::_IsSlopedRail(start, middle, end)
-{
- local NW = 0; // Set to true if we want to build a rail to / from the north-west
- local NE = 0; // Set to true if we want to build a rail to / from the north-east
- local SW = 0; // Set to true if we want to build a rail to / from the south-west
- local SE = 0; // Set to true if we want to build a rail to / from the south-east
-
- if (middle - AIMap.GetMapSizeX() == start || middle - AIMap.GetMapSizeX() == end) NW = 1;
- if (middle - 1 == start || middle - 1 == end) NE = 1;
- if (middle + AIMap.GetMapSizeX() == start || middle + AIMap.GetMapSizeX() == end) SE = 1;
- if (middle + 1 == start || middle + 1 == end) SW = 1;
-
- /* If there is a turn in the current tile, it can't be sloped. */
- if ((NW || SE) && (NE || SW)) return false;
-
- local slope = AITile.GetSlope(middle);
- /* A rail on a steep slope is always sloped. */
- if (AITile.IsSteepSlope(slope)) return true;
-
- /* If only one corner is raised, the rail is sloped. */
- if (slope == AITile.SLOPE_N || slope == AITile.SLOPE_W) return true;
- if (slope == AITile.SLOPE_S || slope == AITile.SLOPE_E) return true;
-
- if (NW && (slope == AITile.SLOPE_NW || slope == AITile.SLOPE_SE)) return true;
- if (NE && (slope == AITile.SLOPE_NE || slope == AITile.SLOPE_SW)) return true;
-
- return false;
-}
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