Function DrawStationCoverageAreaText

src/station_gui.cpp:77–101

* Calculates and draws the accepted or supplied cargo around the selected tile(s) * @param r Rect where the string is to be drawn. * @param sct which type of cargo is to be displayed (passengers/non-passengers) * @param rad radius around selected tile(s) to be searched * @param supplies if supplied cargoes should be drawn, else accepted cargoes * @return Returns the y value below the string t

 * @return Returns the y value below the string that was drawn
 */
int DrawStationCoverageAreaText(const Rect &r, StationCoverageType sct, int rad, bool supplies)
{
	TileIndex tile = TileVirtXY(_thd.pos.x, _thd.pos.y);
	CargoTypes cargo_mask = 0;
	if (_thd.drawstyle == HT_RECT && tile < Map::Size()) {
		CargoArray cargoes;
		if (supplies) {
			cargoes = GetProductionAroundTiles(tile, _thd.size.x / TILE_SIZE, _thd.size.y / TILE_SIZE, rad);
		} else {
			cargoes = GetAcceptanceAroundTiles(tile, _thd.size.x / TILE_SIZE, _thd.size.y / TILE_SIZE, rad);
		}

		/* Convert cargo counts to a set of cargo bits, and draw the result. */
		for (CargoType cargo = 0; cargo < NUM_CARGO; ++cargo) {
			switch (sct) {
				case SCT_PASSENGERS_ONLY: if (!IsCargoInClass(cargo, CargoClass::Passengers)) continue; break;
				case SCT_NON_PASSENGERS_ONLY: if (IsCargoInClass(cargo, CargoClass::Passengers)) continue; break;
				case SCT_ALL: break;
				default: NOT_REACHED();
			}
			if (cargoes[cargo] >= (supplies ? 1U : 8U)) SetBit(cargo_mask, cargo);
		}
	}
	return DrawStringMultiLine(r, GetString(supplies ? STR_STATION_BUILD_SUPPLIES_CARGO : STR_STATION_BUILD_ACCEPTS_CARGO, cargo_mask));
}

/**
 * Find stations adjacent to the current tile highlight area, so that existing coverage