Function AnimateTile_Town

src/town_cmd.cpp:339–382

* Animate a tile for a town. * Only certain houses can be animated. * The newhouses animation supersedes regular ones. * @param tile TileIndex of the house to animate. */

 * @param tile TileIndex of the house to animate.
 */
static void AnimateTile_Town(TileIndex tile)
{
	if (GetHouseType(tile) >= NEW_HOUSE_OFFSET) {
		AnimateNewHouseTile(tile);
		return;
	}

	if (TimerGameTick::counter & 3) return;

	/* If the house is not one with a lift anymore, then stop this animating.
	 * Not exactly sure when this happens, but probably when a house changes.
	 * Before this was just a return...so it'd leak animated tiles..
	 * That bug seems to have been here since day 1?? */
	if (!HouseSpec::Get(GetHouseType(tile))->building_flags.Test(BuildingFlag::IsAnimated)) {
		DeleteAnimatedTile(tile);
		return;
	}

	if (!LiftHasDestination(tile)) {
		uint i;

		/* Building has 6 floors, number 0 .. 6, where 1 is illegal.
		 * This is due to the fact that the first floor is, in the graphics,
		 *  the height of 2 'normal' floors.
		 * Furthermore, there are 6 lift positions from floor N (incl) to floor N + 1 (excl) */
		do {
			i = RandomRange(7);
		} while (i == 1 || i * 6 == GetLiftPosition(tile));

		SetLiftDestination(tile, i);
	}

	int pos = GetLiftPosition(tile);
	int dest = GetLiftDestination(tile) * 6;
	pos += (pos < dest) ? 1 : -1;
	SetLiftPosition(tile, pos);

	if (pos == dest) {
		HaltLift(tile);
		DeleteAnimatedTile(tile);
	}

	MarkTileDirtyByTile(tile);
}

/**
 * Determines if a town is close to a tile.