C++ Waypoint::IsInUse方法代码示例

/**
 * Convert existing rail to waypoint. Eg build a waypoint station over
 * piece of rail
 * @param start_tile northern most tile where waypoint will be built
 * @param flags type of operation
 * @param p1 various bitstuffed elements
 * - p1 = (bit  4)    - orientation (Axis)
 * - p1 = (bit  8-15) - width of waypoint
 * - p1 = (bit 16-23) - height of waypoint
 * - p1 = (bit 24)    - allow waypoints directly adjacent to other waypoints.
 * @param p2 various bitstuffed elements
 * - p2 = (bit  0- 7) - custom station class
 * - p2 = (bit  8-15) - custom station id
 * @param text unused
 * @return the cost of this operation or an error
 */
CommandCost CmdBuildRailWaypoint(TileIndex start_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
{
	/* Unpack parameters */
	Axis axis      = Extract<Axis, 4, 1>(p1);
	byte width     = GB(p1,  8, 8);
	byte height    = GB(p1, 16, 8);
	bool adjacent  = HasBit(p1, 24);

	StationClassID spec_class = Extract<StationClassID, 0, 8>(p2);
	byte spec_index           = GB(p2, 8, 8);
	StationID station_to_join = GB(p2, 16, 16);

	/* Check if the given station class is valid */
	if (spec_class != STAT_CLASS_WAYP) return CMD_ERROR;
	if (spec_index >= StationClass::Get(spec_class)->GetSpecCount()) return CMD_ERROR;

	/* The number of parts to build */
	byte count = axis == AXIS_X ? height : width;

	if ((axis == AXIS_X ? width : height) != 1) return CMD_ERROR;
	if (count == 0 || count > _settings_game.station.station_spread) return CMD_ERROR;

	bool reuse = (station_to_join != NEW_STATION);
	if (!reuse) station_to_join = INVALID_STATION;
	bool distant_join = (station_to_join != INVALID_STATION);

	if (distant_join && (!_settings_game.station.distant_join_stations || !Waypoint::IsValidID(station_to_join))) return CMD_ERROR;

	/* Make sure the area below consists of clear tiles. (OR tiles belonging to a certain rail station) */
	StationID est = INVALID_STATION;

	/* Check whether the tiles we're building on are valid rail or not. */
	TileIndexDiff offset = TileOffsByDiagDir(AxisToDiagDir(OtherAxis(axis)));
	for (int i = 0; i < count; i++) {
		TileIndex tile = start_tile + i * offset;
		CommandCost ret = IsValidTileForWaypoint(tile, axis, &est);
		if (ret.Failed()) return ret;
	}

	Waypoint *wp = NULL;
	TileArea new_location(TileArea(start_tile, width, height));
	CommandCost ret = FindJoiningWaypoint(est, station_to_join, adjacent, new_location, &wp);
	if (ret.Failed()) return ret;

	/* Check if there is an already existing, deleted, waypoint close to us that we can reuse. */
	TileIndex center_tile = start_tile + (count / 2) * offset;
	if (wp == NULL && reuse) wp = FindDeletedWaypointCloseTo(center_tile, STR_SV_STNAME_WAYPOINT, _current_company);

	if (wp != NULL) {
		/* Reuse an existing waypoint. */
		if (wp->owner != _current_company) return_cmd_error(STR_ERROR_TOO_CLOSE_TO_ANOTHER_WAYPOINT);

		/* check if we want to expand an already existing waypoint? */
		if (wp->train_station.tile != INVALID_TILE) {
			CommandCost ret = CanExpandRailStation(wp, new_location, axis);
			if (ret.Failed()) return ret;
		}

		CommandCost ret = wp->rect.BeforeAddRect(start_tile, width, height, StationRect::ADD_TEST);
		if (ret.Failed()) return ret;
	} else {
		/* allocate and initialize new waypoint */
		if (!Waypoint::CanAllocateItem()) return_cmd_error(STR_ERROR_TOO_MANY_STATIONS_LOADING);
	}

	if (flags & DC_EXEC) {
		if (wp == NULL) {
			wp = new Waypoint(start_tile);
		} else if (!wp->IsInUse()) {
			/* Move existing (recently deleted) waypoint to the new location */
			wp->xy = start_tile;
		}
		wp->owner = GetTileOwner(start_tile);

		wp->rect.BeforeAddRect(start_tile, width, height, StationRect::ADD_TRY);

		wp->delete_ctr = 0;
		wp->facilities |= FACIL_TRAIN;
		wp->build_date = _date;
		wp->string_id = STR_SV_STNAME_WAYPOINT;
		wp->train_station = new_location;

		if (wp->town == NULL) MakeDefaultName(wp);

//.........这里部分代码省略.........