Function createWave

src/OpenLoco/src/Map/WaveManager.cpp:38–89

0x0046956E

    }
    // 0x0046956E
    void createWave(SurfaceElement& surface, const World::Pos2& pos)
    {
        const auto waveIndex = getWaveIndex(World::toTileSpace(pos));
        auto& wave = rawWaves()[waveIndex];
        if (!wave.empty())
        {
            return;
        }
        auto vpPoint = gameToScreen(Pos3(pos.x + 16, pos.y + 16, surface.waterHeight()), WindowManager::getCurrentRotation());
        auto w = WindowManager::findWindowShowing(vpPoint);
        if (w == nullptr)
        {
            return;
        }

        uint16_t dx2 = gPrng2().randNext() & 0xFFFF;
        if (dx2 > 0x1745)
        {
            return;
        }

        // Check whether surrounding tiles are water
        for (const auto& offset : _offsets)
        {
            auto searchLoc = pos + offset;
            if (!World::validCoords(searchLoc))
            {
                return;
            }

            const auto tile = TileManager::get(searchLoc);
            if (tile.isNull())
            {
                return;
            }
            const auto* nearbySurface = tile.surface();
            if (nearbySurface == nullptr)
            {
                return;
            }
            if (nearbySurface->water() == 0)
            {
                return;
            }
        }

        wave.loc = pos;
        wave.frame = 0;
        surface.setFlag6(true);

        ViewportManager::invalidate(pos, surface.waterHeight(), surface.waterHeight(), ZoomLevel::full);
    }

    const Wave& getWave(const uint8_t waveIndex)
    {