Function ViewportUpdatePosition

src/openrct2/interface/Viewport.cpp:507–608

* * rct2: 0x006E7A3A */

     *  rct2: 0x006E7A3A
     */
    void ViewportUpdatePosition(WindowBase* window)
    {
        // Guard against any code attempting to call this at the wrong time.
        Guard::Assert(
            GetContext()->GetDrawingEngine()->GetDrawingContext() != nullptr, "We must be in a valid drawing context.");

        Viewport* viewport = window->viewport;
        if (viewport == nullptr)
            return;

        if (!window->viewportSmartFollowSprite.IsNull())
        {
            ViewportUpdateSmartFollowEntity(window);
        }

        if (!window->viewportTargetSprite.IsNull())
        {
            ViewportUpdateFollowSprite(window);
            return;
        }

        ViewportSetUndergroundFlag(0, window, viewport);

        auto viewportMidPoint = ScreenCoordsXY{ window->savedViewPos.x + viewport->ViewWidth() / 2,
                                                window->savedViewPos.y + viewport->ViewHeight() / 2 };

        auto mapCoord = ViewportPosToMapPos(viewportMidPoint, 0, viewport->rotation);

        // Clamp to the map minimum value
        int32_t at_map_edge = 0;
        if (mapCoord.x < kMapMinimumXY)
        {
            mapCoord.x = kMapMinimumXY;
            at_map_edge = 1;
        }
        if (mapCoord.y < kMapMinimumXY)
        {
            mapCoord.y = kMapMinimumXY;
            at_map_edge = 1;
        }

        // Clamp to the map maximum value (scenario specific)
        auto mapSizeMinus2 = GetMapSizeMinus2();
        if (mapCoord.x > mapSizeMinus2.x)
        {
            mapCoord.x = mapSizeMinus2.x;
            at_map_edge = 1;
        }
        if (mapCoord.y > mapSizeMinus2.y)
        {
            mapCoord.y = mapSizeMinus2.y;
            at_map_edge = 1;
        }

        if (at_map_edge)
        {
            auto centreLoc = centre2dCoordinates({ mapCoord, 0 }, viewport);
            if (centreLoc.has_value())