private float getNewElo(List <Ranking> ownRankingHistory, int ownPosition, Ranking[] otherPlayerRankings, LeagueConfig cf, float ownScore = (float)0)
{
float oldRank = OldRank.HasValue ? cf.InitialElo : OldRank.Value;
int nbOpponents = otherPlayerRankings.Length;
int nbTotalGames = ownRankingHistory.Count;
float avgOpponentRk = (otherPlayerRankings.Sum(x => x.NewRank)) / nbOpponents;
float[] UMA = nbOpponents == 3
? new float[] { cf.Uma4p1, cf.Uma4p2, cf.Uma4p3, cf.Uma4p4 }
: new float[] { cf.Uma3p1, cf.Uma3p2, cf.Uma3p3 };
//Rank affected by score
float basePts =
UMA[ownPosition - 1] //UMA
+ (ownPosition == 1 ? cf.Oka * nbOpponents : -cf.Oka) //OKA
- (ownPosition == nbOpponents + 1 ? cf.PenaltyLast : 0); //PENALTY
basePts += cf.CountPoints ? (ownScore - cf.StartingPoints) : 0; //SCORE
float rankChange = basePts;
//ELO bonus/penalty depending on opponents average ELO
if (cf.UseEloSystem)
{
float baseEloChange = avgOpponentRk - oldRank;
float dampenedEloChange = (baseEloChange / cf.BaseEloChangeDampening); //Moderating the bonus
float finalEloChange = Math.Max(dampenedEloChange, -1 * (UMA[0] + 3 * cf.Oka)); //First player cannot lose more than his UMA+OK
finalEloChange = Math.Min(finalEloChange, -1 * (UMA[nbOpponents] - cf.PenaltyLast)); //Last player cannot win more than his UMA+PENALTY
rankChange += finalEloChange;
}
//Moderating the whole rank change
float currentDeltaRatio = cf.EloChangeStartRatio + (cf.EloChangeEndRatio - cf.EloChangeStartRatio) * (Math.Max(nbTotalGames, cf.TrialPeriodDuration) / cf.TrialPeriodDuration);
float finalRankChange = rankChange * currentDeltaRatio;
var newRank = oldRank + finalRankChange;
if (cf.UseEloSystem)
{
newRank = Math.Max(cf.MinElo, newRank);
}
return(newRank);
}
public Ranking(string userId, List <Ranking> userOldRks, Ranking oldRk2, Ranking oldRk3, Ranking oldRk4, int position, string gameId, string serverId, LeagueConfig config)
{
UserId = userId;
Position = position;
GameId = gameId;
ServerId = serverId;
OldRank = userOldRks.LastOrDefault().NewRank;
NewRank = getNewElo(userOldRks, position, new Ranking[] { oldRk2, oldRk3, oldRk4 }, config);
}