C++ Kart::getInitialPosition方法代码示例

/** Find the position (rank) of every kart
  */
void LinearWorld::updateRacePosition()
{
    // Mostly for debugging:
    beginSetKartPositions();
    const unsigned int kart_amount = m_karts.size();

#ifdef DEBUG
    bool rank_changed = false;
#endif
    
    // NOTE: if you do any changes to this loop, the next loop (see
    // DEBUG_KART_RANK below) needs to have the same changes applied
    // so that debug output is still correct!!!!!!!!!!!
    for (unsigned int i=0; i<kart_amount; i++)
    {
        Kart* kart          = m_karts[i];
        // Karts that are either eliminated or have finished the
        // race already have their (final) position assigned. If
        // these karts would get their rank updated, it could happen
        // that a kart that finished first will be overtaken after
        // crossing the finishing line and become second!
        if(kart->isEliminated() || kart->hasFinishedRace())
        {
            // This is only necessary to support debugging inconsistencies
            // in kart position parameters.
            setKartPosition(i, kart->getPosition());
            continue;
        }
        KartInfo& kart_info = m_kart_info[i];
        
        int p = 1 ;

        const int my_id                = kart->getWorldKartId();
        const int my_laps              = getLapForKart(my_id);
        const float my_progression     = getDistanceDownTrackForKart(my_id);        
        // Count karts ahead of the current kart, i.e. kart that are already finished,
        // have done more laps, or the same number of laps, but a greater distance.
        for (unsigned int j = 0 ; j < kart_amount ; j++)
        {
            if(j == kart->getWorldKartId())  continue; // don't compare a kart with itself
            
            if(m_karts[j]->isEliminated())   continue; // dismiss eliminated karts

            if(!kart->hasFinishedRace() && m_karts[j]->hasFinishedRace())
            {
                p++;
                continue;
            }

            /* has done more or less lapses */
            assert(j==m_karts[j]->getWorldKartId());
            int other_laps = getLapForKart(j);
            if (other_laps !=  my_laps)
            {
                if(other_laps > my_laps)
                {
                    p++; // Other kart has more lapses
                }
                continue;
            }
            // Now both karts have the same number of lapses. Test progression.
            // A kart is ahead if it's driven further, or driven the same
            // distance, but started further to the back.
            float other_progression = getDistanceDownTrackForKart(j);
            if(other_progression > my_progression ||
                (other_progression == my_progression &&
                m_karts[j]->getInitialPosition() > kart->getInitialPosition()) )
            {
                p++;
#if _DEBUG_PRINTS_LIKE_MAD_
                std::cout << "    " << p << " : " << m_karts[j]->getIdent() <<
                        " because he has is further within the track (my progression is " <<
                        my_progression << ", his progression is " << other_progression << ")\n";
#endif
            }
        } //next kart

#ifndef DEBUG
        setKartPosition(i, p);
#else
        rank_changed |= kart->getPosition()!=p;
        if (!setKartPosition(i,p))
        {
            std::cerr << "ERROR, same rank used twice!!\n";

            std::cerr <<  "Info used to decide ranking :\n";
            for (unsigned int d=0; d<kart_amount; d++)
            {
                std::cerr << "   kart " << m_karts[d]->getIdent() << " has finished(" << m_karts[d]->hasFinishedRace()
                          << "), is at lap (" << getLapForKart(d) << "), is at distance("
                          << getDistanceDownTrackForKart(d) << "), is eliminated(" << m_karts[d]->isEliminated() << ")" << std::endl;
            }
                        
            std::cerr <<  "Who has each ranking so far :\n";
            for (unsigned int d=0; d<i; d++)
            {
                std::cerr << "    " << m_karts[d]->getIdent() << " has rank " << m_karts[d]->getPosition() << std::endl;
            }
//.........这里部分代码省略.........