Method updateLastJourneyAverageSpeed

src/OpenLoco/src/Vehicles/VehicleHead.cpp:2710–2783

0x004BACAF

    // 0x004BACAF
    void VehicleHead::updateLastJourneyAverageSpeed()
    {
        if (!hasBreakdownFlags(BreakdownFlags::journeyStarted))
        {
            return;
        }
        Vehicle train(*this);

        breakdownFlags &= ~BreakdownFlags::journeyStarted;
        const auto distanceTravelled = Math::Vector::distance2D(journeyStartPos, Pos2(train.veh2->position));

        const auto timeInTicks = ScenarioManager::getScenarioTicks() - journeyStartTicks;

        auto modeModifier = [](TransportMode m) {
            switch (m)
            {
                default:
                case TransportMode::rail:
                case TransportMode::road:
                    return 21;
                case TransportMode::air:
                    return 36;
                case TransportMode::water:
                    return 31;
            }
        }(mode);

        auto adjustedDistance = distanceTravelled * static_cast<int64_t>(modeModifier);
        auto adjustedTime = timeInTicks;
        // TODO: In the future (when we can diverge) we can just do a 64bit divide instead of
        // slowly bringing down the divisor and dividend by 2 until 32bit
        while (adjustedDistance > std::numeric_limits<uint32_t>::max())
        {
            adjustedDistance >>= 1;
            adjustedTime >>= 1;
        }
        if (adjustedTime == 0)
        {
            return;
        }
        const auto averageSpeed = std::min(train.veh2->maxSpeed, Speed16(adjustedDistance / adjustedTime));
        lastAverageSpeed = averageSpeed;

        Ui::WindowManager::invalidate(Ui::WindowType::vehicle, enumValue(head));

        const auto recordType = [](TransportMode m) {
            switch (m)
            {
                default:
                case TransportMode::rail:
                case TransportMode::road:
                    return 0;
                case TransportMode::air:
                    return 1;
                case TransportMode::water:
                    return 2;
            }
        }(mode);