Function CmdBuildRailWagon

src/train_cmd.cpp:639–714

* Build a railroad wagon. * @param flags type of operation. * @param tile tile of the depot where rail-vehicle is built. * @param e the engine to build. * @param[out] ret the vehicle that has been built. * @return the cost of this operation or an error. */

 * @return the cost of this operation or an error.
 */
static CommandCost CmdBuildRailWagon(DoCommandFlags flags, TileIndex tile, const Engine *e, Vehicle **ret)
{
	const RailVehicleInfo *rvi = &e->VehInfo<RailVehicleInfo>();

	/* Check that the wagon can drive on the track in question */
	if (!IsCompatibleRail(rvi->railtypes, GetRailType(tile))) return CMD_ERROR;

	if (flags.Test(DoCommandFlag::Execute)) {
		Train *v = new Train();
		*ret = v;
		v->spritenum = rvi->image_index;

		v->engine_type = e->index;
		v->gcache.first_engine = EngineID::Invalid(); // needs to be set before first callback

		DiagDirection dir = GetRailDepotDirection(tile);

		v->direction = DiagDirToDir(dir);
		v->tile = tile;

		int x = TileX(tile) * TILE_SIZE | _vehicle_initial_x_fract[dir];
		int y = TileY(tile) * TILE_SIZE | _vehicle_initial_y_fract[dir];

		v->x_pos = x;
		v->y_pos = y;
		v->z_pos = GetSlopePixelZ(x, y, true);
		v->owner = _current_company;
		v->track = TRACK_BIT_DEPOT;
		v->vehstatus = {VehState::Hidden, VehState::DefaultPalette};

		v->SetWagon();

		v->SetFreeWagon();
		InvalidateWindowData(WC_VEHICLE_DEPOT, v->tile);

		v->cargo_type = e->GetDefaultCargoType();
		assert(IsValidCargoType(v->cargo_type));
		v->cargo_cap = rvi->capacity;
		v->refit_cap = 0;

		v->railtypes = rvi->railtypes;

		v->date_of_last_service = TimerGameEconomy::date;
		v->date_of_last_service_newgrf = TimerGameCalendar::date;
		v->build_year = TimerGameCalendar::year;
		v->sprite_cache.sprite_seq.Set(SPR_IMG_QUERY);
		v->random_bits = Random();

		v->group_id = DEFAULT_GROUP;

		auto prob = TestVehicleBuildProbability(v, v->engine_type, BuildProbabilityType::Reversed);
		if (prob.has_value()) v->flags.Set(VehicleRailFlag::Flipped, prob.value());
		AddArticulatedParts(v);

		v->UpdatePosition();
		v->First()->ConsistChanged(CCF_ARRANGE);
		UpdateTrainGroupID(v->First());