Function CanExpandRailStation

src/station_cmd.cpp:1192–1209

* Check whether we can expand the rail part of the given station. * @param st the station to expand * @param new_ta the current (and if all is fine new) tile area of the rail part of the station * @return Succeeded or failed command. */

 * @return Succeeded or failed command.
 */
CommandCost CanExpandRailStation(const BaseStation *st, TileArea &new_ta)
{
	TileArea cur_ta = st->train_station;

	/* determine new size of train station region.. */
	int x = std::min(TileX(cur_ta.tile), TileX(new_ta.tile));
	int y = std::min(TileY(cur_ta.tile), TileY(new_ta.tile));
	new_ta.w = std::max(TileX(cur_ta.tile) + cur_ta.w, TileX(new_ta.tile) + new_ta.w) - x;
	new_ta.h = std::max(TileY(cur_ta.tile) + cur_ta.h, TileY(new_ta.tile) + new_ta.h) - y;
	new_ta.tile = TileXY(x, y);

	/* make sure the final size is not too big. */
	if (new_ta.w > _settings_game.station.station_spread || new_ta.h > _settings_game.station.station_spread) {
		return CommandCost(STR_ERROR_STATION_TOO_SPREAD_OUT);
	}

	return CommandCost();
}

RailStationTileLayout::RailStationTileLayout(const StationSpec *spec, uint8_t platforms, uint8_t length) : platforms(platforms), length(length)
{