Function ShiftMap

src/openrct2/world/Map.cpp:2192–2367

    }

    void ShiftMap(const TileCoordsXY& amount)
    {
        if (amount.x == 0 && amount.y == 0)
            return;

        auto amountToMove = amount.ToCoordsXY();
        auto& gameState = getGameState();

        // Tile elements
        auto newElements = std::vector<TileElement>();
        for (int32_t y = 0; y < kMaximumMapSizeTechnical; y++)
        {
            for (int32_t x = 0; x < kMaximumMapSizeTechnical; x++)
            {
                auto srcX = x - amount.x;
                auto srcY = y - amount.y;
                if (x > 0 && y > 0 && x < gameState.mapSize.x - 1 && y < gameState.mapSize.y - 1 && srcX > 0 && srcY > 0
                    && srcX < gameState.mapSize.x - 1 && srcY < gameState.mapSize.y - 1)
                {
                    auto srcTile = _tileIndex.GetFirstElementAt(TileCoordsXY(srcX, srcY));
                    do
                    {
                        newElements.push_back(*srcTile);
                    } while (!(srcTile++)->isLastForTile());
                }
                else if (x == 0 || y == 0 || x == gameState.mapSize.x - 1 || y == gameState.mapSize.y - 1)
                {
                    auto surface = GetDefaultSurfaceElement();
                    surface.setBaseZ(kMinimumLandZ);
                    surface.setClearanceZ(kMinimumLandZ);
                    surface.asSurface()->SetSlope(0);
                    surface.asSurface()->SetWaterHeight(0);
                    newElements.push_back(surface);
                }
                else
                {
                    newElements.push_back(GetDefaultSurfaceElement());
                }
            }
        }

        SetTileElements(gameState, std::move(newElements));
        MapRemoveOutOfRangeElements();

        MapExtendBoundarySurfaceShiftX(amount.x, gameState.mapSize.y);
        MapExtendBoundarySurfaceShiftY(amount.y, gameState.mapSize.x);

        for (auto& spawn : gameState.peepSpawns)
            shiftIfNotNull(spawn, amountToMove);

        for (auto& entrance : gameState.park.entrances)
            shiftIfNotNull(entrance, amountToMove);

        // Entities
        auto& entityTweener = EntityTweener::Get();
        for (auto i = 0; i < EnumValue(EntityType::count); i++)
        {
            auto entityType = static_cast<EntityType>(i);