Function initViewport

src/OpenLoco/src/Ui/Windows/TownWindow.cpp:264–325

0x00499A87

        // 0x00499A87
        static void initViewport(Window& self)
        {
            if (self.currentTab != 0)
            {
                return;
            }

            self.callPrepareDraw();

            // Figure out the town's position on the map.
            auto town = TownManager::get(TownId(self.number));
            int16_t tileZ = World::TileManager::getHeight({ town->x, town->y }).landHeight;

            // Compute views.
            SavedView view = {
                town->x,
                town->y,
                ZoomLevel::quarter,
                static_cast<int8_t>(self.viewports[0]->getRotation()),
                tileZ,
            };

            ViewportFlags flags = ViewportFlags::none;
            if (self.viewports[0] != nullptr)
            {
                if (self.savedView == view)
                {
                    return;
                }

                flags = self.viewports[0]->flags;
                self.viewportRemove(0);
            }
            else
            {
                if (Config::get().gridlinesOnLandscape)
                {
                    flags |= ViewportFlags::gridlines_on_landscape;
                }
            }

            self.savedView = view;

            // 0x00499B39 start
            if (self.viewports[0] == nullptr)
            {
                auto widget = &self.widgets[widx::viewport];
                auto tile = World::Pos3({ town->x, town->y, tileZ });
                auto origin = Ui::Point(widget->left + self.x + 1, widget->top + self.y + 1);
                auto size = Ui::Size(widget->width() - 2, widget->height() - 2);
                ViewportManager::create(&self, 0, origin, size, self.savedView.zoomLevel, tile);
                self.invalidate();
                self.flags |= WindowFlags::viewportNoScrolling;
            }
            // 0x00499B39 end

            if (self.viewports[0] != nullptr)
            {