Function TileLoop_Road

src/road_cmd.cpp:2005–2107

static void TileLoop_Road(TileIndex tile)
{
	switch (_settings_game.game_creation.landscape) {
		case LandscapeType::Arctic: {
			/* Roads on flat foundations use the snow level of the height they are elevated to. All others use the snow level of their minimum height. */
			int tile_z = (std::get<Slope>(GetFoundationSlope(tile)) == SLOPE_FLAT) ? GetTileMaxZ(tile) : GetTileZ(tile);
			if (IsOnSnowOrDesert(tile) != (tile_z > GetSnowLine())) {
				ToggleSnowOrDesert(tile);
				MarkTileDirtyByTile(tile);
			}
			break;
		}

		case LandscapeType::Tropic:
			if (GetTropicZone(tile) == TROPICZONE_DESERT && !IsOnSnowOrDesert(tile)) {
				ToggleSnowOrDesert(tile);
				MarkTileDirtyByTile(tile);
			}
			break;

		default:
			break;
	}

	if (IsRoadDepot(tile)) return;

	const Town *t = ClosestTownFromTile(tile, UINT_MAX);
	if (!HasRoadWorks(tile)) {
		HouseZone grp = HouseZone::TownEdge;

		if (t != nullptr) {
			grp = GetTownRadiusGroup(t, tile);

			/* Show an animation to indicate road work */
			if (t->road_build_months != 0 &&
					(DistanceManhattan(t->xy, tile) < 8 || grp != HouseZone::TownEdge) &&
					IsNormalRoad(tile) && !HasAtMostOneBit(GetAllRoadBits(tile))) {
				if (std::get<0>(GetFoundationSlope(tile)) == SLOPE_FLAT && EnsureNoVehicleOnGround(tile).Succeeded() && Chance16(1, 40)) {
					StartRoadWorks(tile);

					if (_settings_client.sound.ambient) SndPlayTileFx(SND_21_ROAD_WORKS, tile);
					CreateEffectVehicleAbove(
						TileX(tile) * TILE_SIZE + 7,
						TileY(tile) * TILE_SIZE + 7,
						0,
						EV_BULLDOZER);
					MarkTileDirtyByTile(tile);
					return;
				}
			}
		}

		{
			/* Adjust road ground type depending on 'grp' (grp is the distance to the center) */
			const Roadside *new_rs = (_settings_game.game_creation.landscape == LandscapeType::Toyland) ? _town_road_types_2[to_underlying(grp)] : _town_road_types[to_underlying(grp)];
			Roadside cur_rs = GetRoadside(tile);

			/* We have our desired type, do nothing */