Function GetTownRadiusGroup

src/town_cmd.cpp:2516–2528

* Returns the bit corresponding to the town zone of the specified tile. * @param t Town on which town zone is to be found. * @param tile TileIndex where town zone needs to be found. * @return the bit position of the given zone, as defined in HouseZones. */

 * @return the bit position of the given zone, as defined in HouseZones.
 */
HouseZone GetTownRadiusGroup(const Town *t, TileIndex tile)
{
	uint dist = DistanceSquare(tile, t->xy);

	if (t->fund_buildings_months != 0 && dist <= 25) return HouseZone::TownCentre;

	HouseZone smallest = HouseZone::TownEdge;
	for (HouseZone i : HZ_ZONE_ALL) {
		if (dist < t->cache.squared_town_zone_radius[to_underlying(i)]) smallest = i;
	}

	return smallest;
}

/**
 * Clears tile and builds a house or house part.