C++ Vehicle::GetNextVehicle方法代码示例

/**
 * Clone a vehicle. If it is a train, it will clone all the cars too
 * @param tile tile of the depot where the cloned vehicle is build
 * @param flags type of operation
 * @param p1 the original vehicle's index
 * @param p2 1 = shared orders, else copied orders
 * @param text unused
 * @return the cost of this operation or an error
 */
CommandCost CmdCloneVehicle(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
{
	CommandCost total_cost(EXPENSES_NEW_VEHICLES);

	Vehicle *v = Vehicle::GetIfValid(p1);
	if (v == NULL || !v->IsPrimaryVehicle()) return CMD_ERROR;
	Vehicle *v_front = v;
	Vehicle *w = NULL;
	Vehicle *w_front = NULL;
	Vehicle *w_rear = NULL;

	/*
	 * v_front is the front engine in the original vehicle
	 * v is the car/vehicle of the original vehicle that is currently being copied
	 * w_front is the front engine of the cloned vehicle
	 * w is the car/vehicle currently being cloned
	 * w_rear is the rear end of the cloned train. It's used to add more cars and is only used by trains
	 */

	CommandCost ret = CheckOwnership(v->owner);
	if (ret.Failed()) return ret;

	if (v->type == VEH_TRAIN && (!v->IsFrontEngine() || Train::From(v)->crash_anim_pos >= 4400)) return CMD_ERROR;

	/* check that we can allocate enough vehicles */
	if (!(flags & DC_EXEC)) {
		int veh_counter = 0;
		do {
			veh_counter++;
		} while ((v = v->Next()) != NULL);

		if (!Vehicle::CanAllocateItem(veh_counter)) {
			return_cmd_error(STR_ERROR_TOO_MANY_VEHICLES_IN_GAME);
		}
	}

	v = v_front;

	do {
		if (v->type == VEH_TRAIN && Train::From(v)->IsRearDualheaded()) {
			/* we build the rear ends of multiheaded trains with the front ones */
			continue;
		}

		/* In case we're building a multi headed vehicle and the maximum number of
		 * vehicles is almost reached (e.g. max trains - 1) not all vehicles would
		 * be cloned. When the non-primary engines were build they were seen as
		 * 'new' vehicles whereas they would immediately be joined with a primary
		 * engine. This caused the vehicle to be not build as 'the limit' had been
		 * reached, resulting in partially build vehicles and such. */
		DoCommandFlag build_flags = flags;
		if ((flags & DC_EXEC) && !v->IsPrimaryVehicle()) build_flags |= DC_AUTOREPLACE;

		CommandCost cost = DoCommand(tile, v->engine_type | (1 << 16), 0, build_flags, GetCmdBuildVeh(v));

		if (cost.Failed()) {
			/* Can't build a part, then sell the stuff we already made; clear up the mess */
			if (w_front != NULL) DoCommand(w_front->tile, w_front->index | (1 << 20), 0, flags, GetCmdSellVeh(w_front));
			return cost;
		}

		total_cost.AddCost(cost);

		if (flags & DC_EXEC) {
			w = Vehicle::Get(_new_vehicle_id);

			if (v->type == VEH_TRAIN && HasBit(Train::From(v)->flags, VRF_REVERSE_DIRECTION)) {
				SetBit(Train::From(w)->flags, VRF_REVERSE_DIRECTION);
			}

			if (v->type == VEH_TRAIN && !v->IsFrontEngine()) {
				/* this s a train car
				 * add this unit to the end of the train */
				CommandCost result = DoCommand(0, w->index | 1 << 20, w_rear->index, flags, CMD_MOVE_RAIL_VEHICLE);
				if (result.Failed()) {
					/* The train can't be joined to make the same consist as the original.
					 * Sell what we already made (clean up) and return an error.           */
					DoCommand(w_front->tile, w_front->index | 1 << 20, 0, flags, GetCmdSellVeh(w_front));
					DoCommand(w_front->tile, w->index       | 1 << 20, 0, flags, GetCmdSellVeh(w));
					return result; // return error and the message returned from CMD_MOVE_RAIL_VEHICLE
				}
			} else {
				/* this is a front engine or not a train. */
				w_front = w;
				w->service_interval = v->service_interval;
				w->SetServiceIntervalIsCustom(v->ServiceIntervalIsCustom());
				w->SetServiceIntervalIsPercent(v->ServiceIntervalIsPercent());
			}
			w_rear = w; // trains needs to know the last car in the train, so they can add more in next loop
		}
	} while (v->type == VEH_TRAIN && (v = v->GetNextVehicle()) != NULL);
//.........这里部分代码省略.........