// -----------------------------------------------------------------------------------------------
int CvDistanceMap::GetClosestFeatureOwner(const CvPlot& plot)
{
if (m_bDirty)
Update();
if (m_bArrayAllocated)
return UNPACK_OWNER( m_vClosestFeature[ GC.getMap().plotNum( plot.getX(), plot.getY() ) ] );
return -1;
}
/// Updates the lookup table
void CvDistanceMapTurns::Update()
{
//performance optimization, reduce pathfinding range
int iMaxTurns = GC.getGame().getElapsedGameTurns() == 0 ? 7 : 12;
int iVeryFar = iMaxTurns * 6;
const CvMap& map = GC.getMap();
int nPlots = map.numPlots();
m_vDistance = std::vector<int>(nPlots, iVeryFar);
m_vClosestFeature = std::vector<int>(nPlots,0);
m_bArrayAllocated = true;
for (int i = 0; i < MAX_PLAYERS; i++)
{
//if we have a set player, ignore all others
if (m_ePlayer!=NO_PLAYER && m_ePlayer!=i)
continue;
// for each city
CvPlayer& thisPlayer = GET_PLAYER((PlayerTypes)i);
int iCityIndex = 0;
for(CvCity* pLoopCity = thisPlayer.firstCity(&iCityIndex); pLoopCity != NULL; pLoopCity = thisPlayer.nextCity(&iCityIndex))
{
//slow update only for plots close to the city
ReachablePlots turnsFromCity;
SPathFinderUserData data(m_ePlayer, PT_GENERIC_REACHABLE_PLOTS, -1, iMaxTurns);
turnsFromCity = GC.GetStepFinder().GetPlotsInReach(pLoopCity->plot(), data);
for (ReachablePlots::iterator it = turnsFromCity.begin(); it != turnsFromCity.end(); ++it)
{
int iTurns = it->iTurns;
bool bUpdate = (iTurns < m_vDistance[it->iPlotIndex]);
//in case of equal distance, take care not to prefer the player with the lower ID
if (iTurns == m_vDistance[it->iPlotIndex])
{
PlayerTypes currentOwner = (PlayerTypes)UNPACK_OWNER(m_vClosestFeature[it->iPlotIndex]);
CvCity* pCurrentCity = GET_PLAYER(currentOwner).getCity(UNPACK_ID(m_vClosestFeature[it->iPlotIndex]));
//it can happen that there is no current city if the plot has never been updated because it's very remote
bUpdate = (pCurrentCity==NULL) || (pCurrentCity->getGameTurnFounded() > pLoopCity->getGameTurnFounded());
}
if (bUpdate)
{
m_vDistance[it->iPlotIndex] = iTurns;
m_vClosestFeature[it->iPlotIndex] = PACK(pLoopCity->getOwner(), pLoopCity->GetID());
}
}
}
}
m_bDirty = false;
}
/// Updates the danger plots values to reflect threats across the map
void CvDistanceMap::Update()
{
const CvMap& map = GC.getMap();
int nPlots = map.numPlots();
m_vDistance = std::vector<int>(nPlots,INT_MAX);
m_vClosestFeature = std::vector<int>(nPlots,0);
m_bArrayAllocated = true;
// since we know there are very few cities compared to the number of plots,
// we don't need to do the full distance transform
for (int i = 0; i < MAX_PLAYERS; i++)
{
if (m_ePlayer!=NO_PLAYER && m_ePlayer!=i)
continue;
// for each city
CvPlayer& thisPlayer = GET_PLAYER((PlayerTypes)i);
int iCityIndex = 0;
for(CvCity* pLoopCity = thisPlayer.firstCity(&iCityIndex); pLoopCity != NULL; pLoopCity = thisPlayer.nextCity(&iCityIndex))
{
CvPlot* pCityPlot = pLoopCity->plot();
for (int iPlotIndex=0; iPlotIndex<nPlots; iPlotIndex++)
{
CvPlot* pPlot = map.plotByIndexUnchecked(iPlotIndex);
if (pPlot)
{
int iDistance = plotDistance( pCityPlot->getX(),pCityPlot->getY(),pPlot->getX(),pPlot->getY() );
bool bUpdate = (iDistance < m_vDistance[iPlotIndex]);
//in case of equal distance, take care not to prefer the player with the lower ID
if (iDistance == m_vDistance[iPlotIndex])
{
PlayerTypes currentOwner = (PlayerTypes) UNPACK_OWNER(m_vClosestFeature[iPlotIndex]);
CvCity* pCurrentCity = GET_PLAYER(currentOwner).getCity( UNPACK_ID(m_vClosestFeature[iPlotIndex]) );
bUpdate = (pCurrentCity->getGameTurnFounded() > pLoopCity->getGameTurnFounded());
}
if (bUpdate)
{
m_vDistance[iPlotIndex] = iDistance;
m_vClosestFeature[iPlotIndex] = PACK(pLoopCity->getOwner(), pLoopCity->GetID());
}
}
}
}
}
m_bDirty = false;
}
