Function GetOrderDistance

src/order_cmd.cpp:589–609

* Get the distance between two orders of a vehicle. Conditional orders are resolved * and the bigger distance of the two order branches is returned. * @param prev Origin order. * @param cur Destination order. * @param v The vehicle to get the distance for. * @param conditional_depth Internal param for resolving conditional orders. * @return Maximum distance between the two orders. */

 * @return Maximum distance between the two orders.
 */
uint GetOrderDistance(VehicleOrderID prev, VehicleOrderID cur, const Vehicle *v, int conditional_depth)
{
	assert(v->orders != nullptr);
	const OrderList &orderlist = *v->orders;
	auto orders = orderlist.GetOrders();

	if (orders[cur].IsType(OT_CONDITIONAL)) {
		if (conditional_depth > v->GetNumOrders()) return 0;

		conditional_depth++;

		int dist1 = GetOrderDistance(prev, orders[cur].GetConditionSkipToOrder(), v, conditional_depth);
		int dist2 = GetOrderDistance(prev, orderlist.GetNext(cur), v, conditional_depth);
		return std::max(dist1, dist2);
	}

	TileIndex prev_tile = orders[prev].GetLocation(v, true);
	TileIndex cur_tile = orders[cur].GetLocation(v, true);
	if (prev_tile == INVALID_TILE || cur_tile == INVALID_TILE) return 0;
	return v->type == VEH_AIRCRAFT ? DistanceSquare(prev_tile, cur_tile) : DistanceManhattan(prev_tile, cur_tile);
}

/**
 * Add an order to the orderlist of a vehicle.