Function getHeight

src/OpenLoco/src/Map/TileManager.cpp:509–576

* Return the absolute height of an element, given its (x, y) coordinates * remember to & with 0xFFFF if you don't want water affecting results * * @param x @ * @param y @ * @return height @ * * 0x00467297 rct2: 0x00662783 (numbers different) */

     * 0x00467297 rct2: 0x00662783 (numbers different)
     */
    TileHeight getHeight(const Pos2& pos)
    {
        TileHeight height{ 16, 0 };
        // Off the map
        if ((unsigned)pos.x >= (World::kMapWidth - 1) || (unsigned)pos.y >= (World::kMapHeight - 1))
        {
            return height;
        }

        auto tile = TileManager::get(pos);
        // Get the surface element for the tile
        auto surfaceEl = tile.surface();

        if (surfaceEl == nullptr)
        {
            return height;
        }

        height.waterHeight = surfaceEl->waterHeight();
        height.landHeight = surfaceEl->baseHeight();

        const auto slope = surfaceEl->slopeCorners();

        // Sub-tile coords
        const auto xl = pos.x & 0x1f;
        const auto yl = pos.y & 0x1f;

        // Slope logic:
        // Each of the four bits in slope represents that corner being raised
        // slope == 15 (all four bits) is not used and slope == 0 is flat
        // If the extra_height bit is set, then the slope goes up two z-levels (this happens with one corner down with opposite corner up)

        // We arbitrarily take the SW corner to be closest to the viewer

        switch (slope)
        {
            case SurfaceSlope::flat:
                // Flat surface requires no further calculations.
                break;

            case SurfaceSlope::CornerUp::north:
            case SurfaceSlope::CornerUp::east:
            case SurfaceSlope::CornerUp::south:
            case SurfaceSlope::CornerUp::west:
                height.landHeight += getOneCornerUpLandHeight(xl, yl, slope);
                break;

            case SurfaceSlope::SideUp::northeast:
            case SurfaceSlope::SideUp::southeast:
            case SurfaceSlope::SideUp::northwest:
            case SurfaceSlope::SideUp::southwest:
                height.landHeight += getOneSideUpLandHeight(xl, yl, slope);
                break;

            case SurfaceSlope::CornerDown::north:
            case SurfaceSlope::CornerDown::east:
            case SurfaceSlope::CornerDown::south:
            case SurfaceSlope::CornerDown::west: