Core/Mechanic: Implement Diminishing Returns for miss\parry\dodge. Original author for parry\dodge case Lynx3d.

fixes: #2339, #2536, #887, #687 etc.

src/server/game/Entities/Player/Player.cpp

@@ -5754,35 +5754,37 @@ float Player::GetMeleeCritFromAgility()
     return crit*100.0f;
 }
 
-float Player::GetDodgeFromAgility()
+void Player::GetDodgeFromAgility(float &diminishing, float &nondiminishing)
 {
     // Table for base dodge values
-    float dodge_base[MAX_CLASSES] = {
-         0.0075f,   // Warrior
-         0.00652f,  // Paladin
-        -0.0545f,   // Hunter
-        -0.0059f,   // Rogue
-         0.03183f,  // Priest
-         0.0114f,   // DK
-         0.0167f,   // Shaman
-         0.034575f, // Mage
-         0.02011f,  // Warlock
+    const float dodge_base[MAX_CLASSES] =
+    {
+         0.036640f, // Warrior
+         0.034943f, // Paladi
+        -0.040873f, // Hunter
+         0.020957f, // Rogue
+         0.034178f, // Priest
+         0.036640f, // DK
+         0.021080f, // Shaman
+         0.036587f, // Mage
+         0.024211f, // Warlock
          0.0f,      // ??
-        -0.0187f    // Druid
+         0.056097f  // Druid
     };
-    // Crit/agility to dodge/agility coefficient multipliers
-    float crit_to_dodge[MAX_CLASSES] = {
-         1.1f,      // Warrior
-         1.0f,      // Paladin
-         1.6f,      // Hunter
-         2.0f,      // Rogue
-         1.0f,      // Priest
-         1.0f,      // DK?
-         1.0f,      // Shaman
-         1.0f,      // Mage
-         1.0f,      // Warlock
-         0.0f,      // ??
-         1.7f       // Druid
+    // Crit/agility to dodge/agility coefficient multipliers; 3.2.0 increased required agility by 15%
+    const float crit_to_dodge[MAX_CLASSES] =
+    {
+         0.85f/1.15f,    // Warrior
+         1.00f/1.15f,    // Paladin
+         1.11f/1.15f,    // Hunter
+         2.00f/1.15f,    // Rogue
+         1.00f/1.15f,    // Priest
+         0.85f/1.15f,    // DK
+         1.60f/1.15f,    // Shaman
+         1.00f/1.15f,    // Mage
+         0.97f/1.15f,    // Warlock (?)
+         0.0f,           // ??
+         2.00f/1.15f     // Druid
     };
 
     uint8 level = getLevel();
@@ -5791,13 +5793,18 @@ float Player::GetDodgeFromAgility()
     if (level > GT_MAX_LEVEL)
         level = GT_MAX_LEVEL;
 
-    // Dodge per agility for most classes equal crit per agility (but for some classes need apply some multiplier)
+    // Dodge per agility is proportional to crit per agility, which is available from DBC files
     GtChanceToMeleeCritEntry  const *dodgeRatio = sGtChanceToMeleeCritStore.LookupEntry((pclass-1)*GT_MAX_LEVEL + level-1);
     if (dodgeRatio == NULL || pclass > MAX_CLASSES)
-        return 0.0f;
+        return;
 
-    float dodge=dodge_base[pclass-1] + GetStat(STAT_AGILITY) * dodgeRatio->ratio * crit_to_dodge[pclass-1];
-    return dodge*100.0f;
+    // TODO: research if talents/effects that increase total agility by x% should increase non-diminishing part
+    float base_agility = GetCreateStat(STAT_AGILITY) * m_auraModifiersGroup[UNIT_MOD_STAT_START + STAT_AGILITY][BASE_PCT];
+    float bonus_agility = GetStat(STAT_AGILITY) - base_agility;
+
+    // calculate diminishing (green in char screen) and non-diminishing (white) contribution
+    diminishing = 100.0f * bonus_agility * dodgeRatio->ratio * crit_to_dodge[pclass-1];
+    nondiminishing = 100.0f * (dodge_base[pclass-1] + base_agility * dodgeRatio->ratio * crit_to_dodge[pclass-1]);
 }
 
 float Player::GetSpellCritFromIntellect()

src/server/game/Entities/Player/Player.h

@@ -1875,7 +1875,8 @@ class Player : public Unit, public GridObject<Player>
         void UpdateDefenseBonusesMod();
         inline void RecalculateRating(CombatRating cr) { ApplyRatingMod(cr, 0, true);}
         float GetMeleeCritFromAgility();
-        float GetDodgeFromAgility();
+        void GetDodgeFromAgility(float &diminishing, float &nondiminishing);
+        float GetMissPercentageFromDefence(WeaponAttackType attType) const;
         float GetSpellCritFromIntellect();
         float OCTRegenHPPerSpirit();
         float OCTRegenMPPerSpirit();