Function getTrackProgressAtCursor

src/OpenLoco/src/Ui/Windows/Vehicle.cpp:4576–4606

0x004A43E4

        // 0x004A43E4
        static uint16_t getTrackProgressAtCursor(const Point& cursorLoc, Ui::Viewport& viewport, const TrackElement& trackElement, const World::Pos3& loc)
        {
            // Get the coordinates of the first tile of the possibly multi-tile track
            const auto& trackDataArr = World::TrackData::getTrackPiece(trackElement.trackId());
            const auto& trackData = trackDataArr[trackElement.sequenceIndex()];
            auto trackOffset2 = Math::Vector::rotate(World::Pos2(trackData.x, trackData.y), trackElement.rotation());
            auto trackOffset = World::Pos3(trackOffset2.x, trackOffset2.y, trackData.z);
            auto trackFirstTile = loc - trackOffset;

            // Get the movement info for this specific track id
            uint16_t trackAndDirection = trackElement.rotation() | (trackElement.trackId() << 3);
            const auto moveInfoArr = World::TrackData::getTrackSubPositon(trackAndDirection);

            // This iterates the movement info trying to find the distance along the track that is as close as possible
            // to the cursors location.
            int32_t bestDistance = std::numeric_limits<int32_t>::max();
            uint16_t bestProgress = 0;
            for (const auto& moveInfo : moveInfoArr)
            {
                auto potentialLoc = trackFirstTile + moveInfo.loc;
                auto viewPos = World::gameToScreen(potentialLoc, viewport.getRotation());
                auto uiPos = viewport.viewportToScreen(viewPos);
                auto distance = Math::Vector::manhattanDistance2D(uiPos, cursorLoc);
                if (distance < bestDistance)
                {
                    bestDistance = distance;
                    bestProgress = std::distance(&*moveInfoArr.begin(), &moveInfo);
                }
            }
            return bestProgress;
        }

        // 0x004A40C5
        static std::optional<GameCommands::VehiclePlacementArgs> getTrackAtCursor(const int16_t x, const int16_t y)