Function GetProductionAroundTiles

src/station_cmd.cpp:533–560

* Get the cargo types being produced around the tile (in a rectangle). * @param north_tile Northern most tile of area * @param w X extent of the area * @param h Y extent of the area * @param rad Search radius in addition to the given area */

 * @param rad Search radius in addition to the given area
 */
CargoArray GetProductionAroundTiles(TileIndex north_tile, int w, int h, int rad)
{
	CargoArray produced{};
	FlatSet<IndustryID> industries;
	TileArea ta = TileArea(north_tile, w, h).Expand(rad);

	/* Loop over all tiles to get the produced cargo of
	 * everything except industries */
	for (TileIndex tile : ta) {
		if (IsTileType(tile, MP_INDUSTRY)) industries.insert(GetIndustryIndex(tile));
		AddProducedCargo(tile, produced);
	}

	/* Loop over the seen industries. They produce cargo for
	 * anything that is within 'rad' of any one of their tiles.
	 */
	for (IndustryID industry : industries) {
		const Industry *i = Industry::Get(industry);
		/* Skip industry with neutral station */
		if (i->neutral_station != nullptr && !_settings_game.station.serve_neutral_industries) continue;

		for (const auto &p : i->produced) {
			if (IsValidCargoType(p.cargo)) produced[p.cargo]++;
		}
	}

	return produced;
}

/**
 * Get the acceptance of cargoes around the tile in 1/8.