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[8776] proper arena rating calculation

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the elo-formula has K=48 for rating<1000
an K=32 for rating>1000

also set the rating of new members to 0 if they
join a team with rating <1000
This commit is contained in:
danielich 2009-11-05 10:59:32 +01:00 • committed by balrok
parent c50df41b3c
commit 63951591fd
2 changed files with 19 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

28
src/game/ArenaTeam.cpp
View file

@ -136,7 +136,7 @@ bool ArenaTeam::AddMember(const uint64& PlayerGuid)
if (sWorld.getConfig(CONFIG_ARENA_SEASON_ID) >= 6) if (sWorld.getConfig(CONFIG_ARENA_SEASON_ID) >= 6)
{ {
if (m_stats.rating < 1000) if (m_stats.rating < 1000)
newmember.personal_rating = m_stats.rating; newmember.personal_rating = 0;
else else
newmember.personal_rating = 1000; newmember.personal_rating = 1000;
} }
@ -513,8 +513,8 @@ float ArenaTeam::GetChanceAgainst(uint32 own_rating, uint32 enemy_rating)
// ELO system // ELO system
if (sWorld.getConfig(CONFIG_ARENA_SEASON_ID) >= 6) if (sWorld.getConfig(CONFIG_ARENA_SEASON_ID) >= 6)
if (enemy_rating < 1500) if (enemy_rating < 1000)
enemy_rating = 1500; enemy_rating = 1000;
return 1.0f/(1.0f+exp(log(10.0f)*(float)((float)enemy_rating - (float)own_rating)/400.0f)); return 1.0f/(1.0f+exp(log(10.0f)*(float)((float)enemy_rating - (float)own_rating)/400.0f));
} }
@ -542,8 +542,9 @@ int32 ArenaTeam::WonAgainst(uint32 againstRating)
// called when the team has won // called when the team has won
// 'chance' calculation - to beat the opponent // 'chance' calculation - to beat the opponent
float chance = GetChanceAgainst(m_stats.rating, againstRating); float chance = GetChanceAgainst(m_stats.rating, againstRating);
// calculate the rating modification (ELO system with k=32) float K = (m_stats.rating < 1000) ? 48.0f : 32.0f;
int32 mod = (int32)floor(32.0f * (1.0f - chance)); // calculate the rating modification (ELO system with k=32 or k=48 if rating<1000)
int32 mod = (int32)floor(K* (1.0f - chance));
// modify the team stats accordingly // modify the team stats accordingly
FinishGame(mod); FinishGame(mod);
m_stats.wins_week += 1; m_stats.wins_week += 1;
@ -558,8 +559,9 @@ int32 ArenaTeam::LostAgainst(uint32 againstRating)
// called when the team has lost // called when the team has lost
//'chance' calculation - to loose to the opponent //'chance' calculation - to loose to the opponent
float chance = GetChanceAgainst(m_stats.rating, againstRating); float chance = GetChanceAgainst(m_stats.rating, againstRating);
// calculate the rating modification (ELO system with k=32) float K = (m_stats.rating < 1000) ? 48.0f : 32.0f;
int32 mod = (int32)ceil(32.0f * (0.0f - chance)); // calculate the rating modification (ELO system with k=32 or k=48 if rating<1000)
int32 mod = (int32)floor(K* (1.0f - chance));
// modify the team stats accordingly // modify the team stats accordingly
FinishGame(mod); FinishGame(mod);
@ -576,7 +578,9 @@ void ArenaTeam::MemberLost(Player * plr, uint32 againstRating)
{ {
// update personal rating // update personal rating
float chance = GetChanceAgainst(itr->personal_rating, againstRating); float chance = GetChanceAgainst(itr->personal_rating, againstRating);
int32 mod = (int32)ceil(32.0f * (0.0f - chance)); float K = (m_stats.rating < 1000) ? 48.0f : 32.0f;
// calculate the rating modification (ELO system with k=32 or k=48 if rating<1000)
int32 mod = (int32)floor(K* (1.0f - chance));
itr->ModifyPersonalRating(plr, mod, GetSlot()); itr->ModifyPersonalRating(plr, mod, GetSlot());
// update personal played stats // update personal played stats
itr->games_week += 1; itr->games_week += 1;
@ -598,7 +602,9 @@ void ArenaTeam::OfflineMemberLost(uint64 guid, uint32 againstRating)
{ {
// update personal rating // update personal rating
float chance = GetChanceAgainst(itr->personal_rating, againstRating); float chance = GetChanceAgainst(itr->personal_rating, againstRating);
int32 mod = (int32)ceil(32.0f * (0.0f - chance)); float K = (m_stats.rating < 1000) ? 48.0f : 32.0f;
// calculate the rating modification (ELO system with k=32 or k=48 if rating<1000)
int32 mod = (int32)floor(K* (1.0f - chance));
if (int32(itr->personal_rating) + mod < 0) if (int32(itr->personal_rating) + mod < 0)
itr->personal_rating = 0; itr->personal_rating = 0;
else else
@ -620,7 +626,9 @@ void ArenaTeam::MemberWon(Player * plr, uint32 againstRating)
{ {
// update personal rating // update personal rating
float chance = GetChanceAgainst(itr->personal_rating, againstRating); float chance = GetChanceAgainst(itr->personal_rating, againstRating);
int32 mod = (int32)floor(32.0f * (1.0f - chance)); float K = (m_stats.rating < 1000) ? 48.0f : 32.0f;
// calculate the rating modification (ELO system with k=32 or k=48 if rating<1000)
int32 mod = (int32)floor(K* (1.0f - chance));
itr->ModifyPersonalRating(plr, mod, GetSlot()); itr->ModifyPersonalRating(plr, mod, GetSlot());
// update personal stats // update personal stats
itr->games_week += 1; itr->games_week += 1;

2
src/shared/revision_nr.h
View file

@ -1,4 +1,4 @@
#ifndef __REVISION_NR_H__ #ifndef __REVISION_NR_H__
#define __REVISION_NR_H__ #define __REVISION_NR_H__
#define REVISION_NR "8775" #define REVISION_NR "8776"
#endif // __REVISION_NR_H__ #endif // __REVISION_NR_H__