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Add a function to calculate the ratin gain/loss, instead of calculating it seperately 5 times.

Browse Source 
Thanks to proof1337 for the patch.
Closes issue #3686

--HG--
branch : trunk
This commit is contained in:
Liberate
2010-08-29 23:36:55 +02:00
parent d952c90754
commit 1f9936399c
2 changed files with 43 additions and 43 deletions
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85
src/server/game/Battlegrounds/ArenaTeam.cpp
View File

@@ -627,6 +627,34 @@ float ArenaTeam::GetChanceAgainst(uint32 own_rating, uint32 enemy_rating)
return 1.0f/(1.0f+exp(log(10.0f)*(float)((float)enemy_rating - (float)own_rating)/400.0f));
}
int32 ArenaTeam::GetRatingMod(uint32 own_rating, uint32 enemy_rating, bool won, bool calculating_mmr)
{
// 'chance' calculation - to beat the opponent
float chance = GetChanceAgainst(own_rating, enemy_rating);
float won_mod = (won) ? 1.0f : 0.0f;
// calculate the rating modification
// simulation on how it works. Not much info on how it really works
float mod;
if (won && !calculating_mmr)
{
if (own_rating < 1000)
mod = 48.0f * (won_mod - chance);
else if (own_rating < 1300)
mod = (24.0f + (24.0f * (1300.0f - int32(own_rating)) / 300.0f)) * (won_mod - chance);
else
mod = 24.0f * (won_mod - chance);
}
else
mod = 24.0f * (won_mod - chance);
if (won)
return (int32)ceil(mod);
else
return (int32)floor(mod);
}
void ArenaTeam::FinishGame(int32 mod)
{
if (int32(m_stats.rating) + mod < 0)
@@ -649,17 +677,7 @@ void ArenaTeam::FinishGame(int32 mod)
int32 ArenaTeam::WonAgainst(uint32 againstRating)
{
// called when the team has won
// 'chance' calculation - to beat the opponent
float chance = GetChanceAgainst(m_stats.rating, againstRating);
// calculate the rating modification
// simulation on how it works. Not much info on how it really works
int32 mod;
if (m_stats.rating < 1000)
mod = (int32)ceil(48.0f * (1.0f - chance));
else if (m_stats.rating < 1300)
mod = (int32)ceil((24.0f + (24.0f * (1300.0f - int32(m_stats.rating)) / 300.0f)) * (1.0f - chance));
else
mod = (int32)ceil(24.0f * (1.0f - chance));
int32 mod = GetRatingMod(m_stats.rating, againstRating, true);
// modify the team stats accordingly
FinishGame(mod);
@@ -673,12 +691,7 @@ int32 ArenaTeam::WonAgainst(uint32 againstRating)
int32 ArenaTeam::LostAgainst(uint32 againstRating)
{
// called when the team has lost
//'chance' calculation - to loose to the opponent
float chance = GetChanceAgainst(m_stats.rating, againstRating);
// calculate the rating lost
// there is not much info on the formula, but this is a very good simulation
int32 mod = (int32)floor(24.0f * (0.0f - chance));
int32 mod = GetRatingMod(m_stats.rating, againstRating, false);
// modify the team stats accordingly
FinishGame(mod);
@@ -695,15 +708,13 @@ void ArenaTeam::MemberLost(Player * plr, uint32 againstMatchmakerRating)
if (itr->guid == plr->GetGUID())
{
// update personal rating
float chance = GetChanceAgainst(itr->personal_rating, m_stats.rating);
// calculate the rating modification
int32 mod = (int32)floor(24.0f * (0.0f - chance));
int32 mod = GetRatingMod(itr->personal_rating, m_stats.rating, false);
itr->ModifyPersonalRating(plr, mod, GetSlot());
// update matchmaker rating
chance = GetChanceAgainst(itr->matchmaker_rating, againstMatchmakerRating);
// calculate the rating modification
mod = (int32)floor(24.0f * (0.0f - chance));
mod = GetRatingMod(itr->matchmaker_rating, againstMatchmakerRating, false, true);
itr->ModifyMatchmakerRating(mod, GetSlot());
// update personal played stats
itr->games_week +=1;
itr->games_season +=1;
@@ -723,15 +734,13 @@ void ArenaTeam::OfflineMemberLost(uint64 guid, uint32 againstMatchmakerRating)
if (itr->guid == guid)
{
// update personal rating
float chance = GetChanceAgainst(itr->personal_rating, m_stats.rating);
// calculate the rating modification
int32 mod = (int32)floor(24.0f * (0.0f - chance));
int32 mod = GetRatingMod(itr->personal_rating, m_stats.rating, false);
itr->ModifyPersonalRating(NULL, mod, GetSlot());
// update matchmaker rating
chance = GetChanceAgainst(itr->matchmaker_rating, againstMatchmakerRating);
// calculate the rating modification
mod = (int32)ceil(24.0f * (0.0f - chance));
mod = GetRatingMod(itr->matchmaker_rating, againstMatchmakerRating, false, true);
itr->ModifyMatchmakerRating(mod, GetSlot());
// update personal played stats
itr->games_week +=1;
itr->games_season +=1;
@@ -747,22 +756,12 @@ void ArenaTeam::MemberWon(Player * plr, uint32 againstMatchmakerRating)
{
if (itr->guid == plr->GetGUID())
{
uint32 matchmakerrating = itr->matchmaker_rating;
// update personal rating
float chance = GetChanceAgainst(itr->personal_rating, m_stats.rating);
// calculate the rating modification
int32 mod;
if (itr->personal_rating < 1000)
mod = (int32)ceil(48.0f * (1.0f - chance));
else if (itr->personal_rating < 1300)
mod = (int32)ceil((24.0f + (24.0f * (1300.0f - int32(itr->personal_rating)) / 300.0f)) * (1.0f - chance));
else
mod = (int32)ceil(24.0f * (1.0f - chance));
itr->ModifyPersonalRating(plr, mod, GetSlot());
int32 mod = GetRatingMod(itr->personal_rating, m_stats.rating, true);
itr->ModifyPersonalRating(NULL, mod, GetSlot());
// update matchmaker rating
chance = GetChanceAgainst(matchmakerrating, againstMatchmakerRating);
// calculate the rating modification
mod = (int32)ceil(24.0f * (1.0f - chance));
mod = GetRatingMod(itr->matchmaker_rating, againstMatchmakerRating, true, true);
itr->ModifyMatchmakerRating(mod, GetSlot());
// update personal stats

1
src/server/game/Battlegrounds/ArenaTeam.h
View File

@@ -197,6 +197,7 @@ class ArenaTeam
void InspectStats(WorldSession *session, uint64 guid);
uint32 GetPoints(uint32 MemberRating);
int32 GetRatingMod(uint32 own_rating, uint32 enemy_rating, bool won, bool calculating_mmr = false);
float GetChanceAgainst(uint32 own_rating, uint32 enemy_rating);
int32 WonAgainst(uint32 againstRating);
void MemberWon(Player * plr, uint32 againstMatchmakerRating);