/**
* Check whether the given tile is suitable for a waypoint.
* @param tile the tile to check for suitability
* @param axis the axis of the waypoint
* @param waypoint Waypoint the waypoint to check for is already joined to. If we find another waypoint it can join to it will throw an error.
*/
static CommandCost IsValidTileForWaypoint(TileIndex tile, Axis axis, StationID *waypoint)
{
/* if waypoint is set, then we have special handling to allow building on top of already existing waypoints.
* so waypoint points to INVALID_STATION if we can build on any waypoint.
* Or it points to a waypoint if we're only allowed to build on exactly that waypoint. */
if (waypoint != NULL && IsTileType(tile, MP_STATION)) {
if (!IsRailWaypoint(tile)) {
return ClearTile_Station(tile, DC_AUTO); // get error message
} else {
StationID wp = GetStationIndex(tile);
if (*waypoint == INVALID_STATION) {
*waypoint = wp;
} else if (*waypoint != wp) {
return_cmd_error(STR_ERROR_WAYPOINT_ADJOINS_MORE_THAN_ONE_EXISTING);
}
}
}
if (GetAxisForNewWaypoint(tile) != axis) return_cmd_error(STR_ERROR_NO_SUITABLE_RAILROAD_TRACK);
Owner owner = GetTileOwner(tile);
CommandCost ret = CheckOwnership(owner);
if (ret.Succeeded()) ret = EnsureNoVehicleOnGround(tile);
if (ret.Failed()) return ret;
Slope tileh = GetTileSlope(tile);
if (tileh != SLOPE_FLAT &&
(!_settings_game.construction.build_on_slopes || IsSteepSlope(tileh) || !(tileh & (0x3 << axis)) || !(tileh & ~(0x3 << axis)))) {
return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
}
if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
return CommandCost();
}
/**
* Check whether the given tile is suitable for a waypoint.
* @param tile the tile to check for suitability
* @param axis the axis of the waypoint
* @param waypoint Waypoint the waypoint to check for is already joined to. If we find another waypoint it can join to it will throw an error.
* @param flags flags for the command
*/
static CommandCost IsValidTileForWaypoint(TileIndex tile, Axis axis, StationID *waypoint, DoCommandFlag flags)
{
/* if waypoint is set, then we have special handling to allow building on top of already existing waypoints.
* so waypoint points to INVALID_STATION if we can build on any waypoint.
* Or it points to a waypoint if we're only allowed to build on exactly that waypoint. */
if (waypoint != NULL && IsTileType(tile, MP_STATION)) {
if (!IsRailWaypoint(tile)) {
return ClearTile_Station(tile, DC_AUTO); // get error message
} else {
StationID wp = GetStationIndex(tile);
if (*waypoint == INVALID_STATION) {
*waypoint = wp;
} else if (*waypoint != wp) {
return_cmd_error(STR_ERROR_WAYPOINT_ADJOINS_MORE_THAN_ONE_EXISTING);
}
}
}
/* When pasting a waypoint, there may be no track yet (it will be placed when DC_EXEC'ing).
* Ignore that so we can calculate the cost more precisely. */
bool ignore_lack_of_tracks = (flags & DC_PASTE) && !(flags & DC_EXEC);
if (!ignore_lack_of_tracks || IsTileType(tile, MP_RAILWAY)) {
if (GetAxisForNewWaypoint(tile) != axis) return_cmd_error(STR_ERROR_NO_SUITABLE_RAILROAD_TRACK);
}
Owner owner = GetTileOwner(tile);
if (!ignore_lack_of_tracks || owner != OWNER_NONE) {
CommandCost ret = CheckOwnership(owner);
if (ret.Failed()) return ret;
}
CommandCost ret = EnsureNoVehicleOnGround(tile);
if (ret.Failed()) return ret;
Slope tileh = GetTileSlope(tile);
if (tileh != SLOPE_FLAT &&
(!_settings_game.construction.build_on_slopes || IsSteepSlope(tileh) || !(tileh & (0x3 << axis)) || !(tileh & ~(0x3 << axis)))) {
return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
}
if (IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
return CommandCost();
}
