Function generateTrees

src/OpenLoco/src/Map/MapGenerator/MapGenerator.cpp:651–725

0x004BDA49

    // 0x004BDA49
    static void generateTrees()
    {
        const auto& options = Scenario::getOptions();

        // Place forests
        for (auto i = 0; i < options.numberOfForests; ++i)
        {
            const auto randRadius = ((gPrng1().randNext(255) * std::max(options.maxForestRadius - options.minForestRadius, 0)) / 255 + options.minForestRadius) * kTileSize;
            const auto randLoc = World::TilePos2(gPrng1().randNext(kMapRows), gPrng1().randNext(kMapColumns));
            const auto randDensity = (gPrng1().randNext(15) * std::max(options.maxForestDensity - options.minForestDensity, 0)) / 15 + options.minForestDensity;
            placeTreeCluster(randLoc, randRadius, randDensity, std::nullopt);

            if (TileManager::numFreeElements() < 0x1B000)
            {
                break;
            }
        }

        // Place a number of random trees
        for (auto i = 0; i < options.numberRandomTrees; ++i)
        {
            const auto randLoc = World::Pos2(gPrng1().randNext(kMapWidth), gPrng1().randNext(kMapHeight));
            placeRandomTree(randLoc, std::nullopt);
        }

        // Cull trees that are too high / low
        uint32_t randMask = gPrng1().randNext();
        uint32_t i = 0;
        std::vector<TileElement*> toBeRemoved;
        for (auto& loc : getWorldRange())
        {
            auto tile = TileManager::get(loc);
            for (auto& el : tile)
            {
                auto* elTree = el.as<TreeElement>();
                if (elTree == nullptr)
                {
                    continue;
                }

                if (elTree->baseHeight() / kMicroToSmallZStep <= options.minAltitudeForTrees)
                {
                    if (elTree->baseHeight() / kMicroToSmallZStep != options.minAltitudeForTrees
                        || (randMask & (1 << i)))
                    {
                        toBeRemoved.push_back(&el);
                        i++;
                        i %= 32;
                        break;
                    }
                }

                if (elTree->baseHeight() / kMicroToSmallZStep >= options.maxAltitudeForTrees)
                {
                    if (elTree->baseHeight() / kMicroToSmallZStep != options.maxAltitudeForTrees
                        || (randMask & (1 << i)))
                    {
                        toBeRemoved.push_back(&el);