Arena rating system old

gistfile1.diff

--- a/src/server/game/Battlegrounds/ArenaTeam.cpp
+++ b/src/server/game/Battlegrounds/ArenaTeam.cpp
@@ -575,29 +599,25 @@
uint32 ArenaTeam::GetAverageMMR(Group* group) const
{
   if (!group)
        return 0;

   uint32 matchMakerRating = 0;
   uint32 playerDivider = 0;
   for (MemberList::const_iterator itr = Members.begin(); itr != Members.end(); ++itr)          
   {
        // Skip if player is not online
        if (!ObjectAccessor::FindPlayer(itr->Guid))
                continue;
                                
        // Skip if player is not member of group
        if (!group->IsMember(itr->Guid))                                 
                continue;

-        matchMakerRating += itr->MatchMakerRating;
-        ++playerDivider;
                                
    }
        
    // x/0 = crash
    if (playerDivider == 0)
        playerDivider = 1;

-    matchMakerRating /= playerDivider;
-
-    return matchMakerRating;
+    return Stats.Rating;
}
@@ -613,19 +621,16 @@
 
     // Calculate the rating modification
     // Simulation on how it works. Not much info on how it really works
-    float mod;
-
-    if (won && !calculateMatchMakerRating)
-    {
-        if (ownRating < 1000)
-            mod = 48.0f * (won_mod - chance);
-        else if (ownRating < 1300)
-            mod = (24.0f + (24.0f * (1300.0f - int32(ownRating)) / 300.0f)) * (won_mod - chance);
-        else
-            mod = 24.0f * (won_mod - chance);
+    float mod = 32.0f * (won_mod - chance); // correct value of K is 32 says wowwiki
+    
+    // if it's loss and it's not calculation of MMR
+    if(!won && !calculateMatchMakerRating){
+        if(ownRating < 1000){ // team rating shouldn't decrease if it's already bellow 1000
+            mod = 0;    
+        }else if(ownRating <= 1300){
+            mod /= 2;
+        }
     }
-    else
-        mod = 24.0f * (won_mod - chance);
 
     return (int32)ceil(mod);
 }
@@ -675,7 +680,7 @@
 {
     // Called when the team has won
     // Own team rating versus opponents matchmaker rating
-    int32 mod = GetRatingMod(Stats.Rating, againstRating, true);
+    int32 mod = GetRatingMod(Stats.Rating, againstRating, true, false);
 
     // Modify the team stats accordingly
     FinishGame(mod);
@@ -692,7 +697,7 @@
 {
     // Called when the team has lost
     // Own team rating versus opponents matchmaker rating
-    int32 mod = GetRatingMod(Stats.Rating, againstRating, false);
+    int32 mod = GetRatingMod(Stats.Rating, againstRating, false, false);
 
     // Modify the team stats accordingly
     FinishGame(mod);

--- a/src/server/game/Battlegrounds/Battleground.cpp
+++ b/src/server/game/Battlegrounds/Battleground.cpp
@@ -700,8 +700,8 @@
                 loser_matchmaker_rating = GetArenaMatchmakerRating(GetOtherTeam(winner));
                 winner_team_rating = winner_arena_team->GetRating();
                 winner_matchmaker_rating = GetArenaMatchmakerRating(winner);
-                winner_change = winner_arena_team->WonAgainst(loser_matchmaker_rating);
-                loser_change = loser_arena_team->LostAgainst(winner_matchmaker_rating);
+                winner_change = winner_arena_team->WonAgainst(loser_team_rating);
+                loser_change = loser_arena_team->LostAgainst(winner_team_rating);
                 sLog->outArena("--- Winner rating: %u, Loser rating: %u, Winner MMR: %u, Loser MMR: %u, Winner change: %d, Loser change: %d ---", winner_team_rating, loser_team_rating,
                     winner_matchmaker_rating, loser_matchmaker_rating, winner_change, loser_change);
                 SetArenaTeamRatingChangeForTeam(winner, winner_change);