Formulas.h

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/*
 * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef TRINITY_FORMULAS_H
#define TRINITY_FORMULAS_H
 
#include "Creature.h"
#include "GameTables.h"
#include "Map.h"
#include "Player.h"
#include "ScriptMgr.h"
#include "SharedDefines.h"
#include "World.h"
 
namespace Trinity
{
 inline uint32 GetExpansionForLevel(uint32 level)
 {
 if (level < 60)
 return EXPANSION_CLASSIC;
 else if (level < 70)
 return EXPANSION_THE_BURNING_CRUSADE;
 else if (level < 80)
 return EXPANSION_WRATH_OF_THE_LICH_KING;
 else if (level < 85)
 return EXPANSION_CATACLYSM;
 else if (level < 90)
 return EXPANSION_MISTS_OF_PANDARIA;
 else if (level < 100)
 return EXPANSION_WARLORDS_OF_DRAENOR;
 else
 return CURRENT_EXPANSION;
 }
 
 namespace Honor
 {
 inline float hk_honor_at_level_f(uint8 level, float multiplier = 1.0f)
 {
 float honor = multiplier * level * 1.55f;
 sScriptMgr->OnHonorCalculation(honor, level, multiplier);
 return honor;
 }
 
 inline uint32 hk_honor_at_level(uint8 level, float multiplier = 1.0f)
 {
 return uint32(ceil(hk_honor_at_level_f(level, multiplier)));
 }
 } // namespace Trinity::Honor
 
 namespace XP
 {
 inline uint8 GetGrayLevel(uint8 pl_level)
 {
 uint8 level;
 
 if (pl_level < 7)
 level = 0;
 else if (pl_level < 35)
 {
 uint8 count = 0;
 for (int i = 15; i <= pl_level; ++i)
 if (i % 5 == 0) ++count;
 
 level = (pl_level - 7) - (count - 1);
 }
 else
 level = pl_level - 10;
 
 sScriptMgr->OnGrayLevelCalculation(level, pl_level);
 return level;
 }
 
 inline XPColorChar GetColorCode(uint8 pl_level, uint8 mob_level)
 {
 XPColorChar color;
 
 if (mob_level >= pl_level + 5)
 color = XP_RED;
 else if (mob_level >= pl_level + 3)
 color = XP_ORANGE;
 else if (mob_level >= pl_level - 2)
 color = XP_YELLOW;
 else if (mob_level > GetGrayLevel(pl_level))
 color = XP_GREEN;
 else
 color = XP_GRAY;
 
 sScriptMgr->OnColorCodeCalculation(color, pl_level, mob_level);
 return color;
 }
 
 inline uint8 GetZeroDifference(uint8 pl_level)
 {
 uint8 diff;
 
 if (pl_level < 4)
 diff = 5;
 else if (pl_level < 10)
 diff = 6;
 else if (pl_level < 12)
 diff = 7;
 else if (pl_level < 16)
 diff = 8;
 else if (pl_level < 20)
 diff = 9;
 else if (pl_level < 30)
 diff = 11;
 else if (pl_level < 40)
 diff = 12;
 else if (pl_level < 45)
 diff = 13;
 else if (pl_level < 50)
 diff = 14;
 else if (pl_level < 55)
 diff = 15;
 else if (pl_level < 60)
 diff = 16;
 else
 diff = 17;
 
 sScriptMgr->OnZeroDifferenceCalculation(diff, pl_level);
 return diff;
 }
 
 inline uint32 BaseGain(uint8 pl_level, uint8 mob_level)
 {
 uint32 baseGain;
 
 GtXpEntry const* xpPlayer = sXpGameTable.GetRow(pl_level);
 GtXpEntry const* xpMob = sXpGameTable.GetRow(mob_level);
 
 if (mob_level >= pl_level)
 {
 uint8 nLevelDiff = mob_level - pl_level;
 if (nLevelDiff > 4)
 nLevelDiff = 4;
 
 baseGain = uint32(round(xpPlayer->PerKill * (1 + 0.05f * nLevelDiff)));
 }
 else
 {
 uint8 gray_level = GetGrayLevel(pl_level);
 if (mob_level > gray_level)
 {
 uint8 ZD = GetZeroDifference(pl_level);
 baseGain = uint32(round(xpMob->PerKill * ((1 - ((pl_level - mob_level) / float(ZD))) * (xpMob->Divisor / xpPlayer->Divisor))));
 }
 else
 baseGain = 0;
 }
 
 if (sWorld->getIntConfig(CONFIG_MIN_CREATURE_SCALED_XP_RATIO) && pl_level != mob_level)
 {
 // Use mob level instead of player level to avoid overscaling on gain in a min is enforced
 uint32 baseGainMin = BaseGain(pl_level, pl_level) * sWorld->getIntConfig(CONFIG_MIN_CREATURE_SCALED_XP_RATIO) / 100;
 baseGain = std::max(baseGainMin, baseGain);
 }
 
 sScriptMgr->OnBaseGainCalculation(baseGain, pl_level, mob_level);
 return baseGain;
 }
 
 inline uint32 Gain(Player* player, Unit* u, bool isBattleGround = false)
 {
 Creature* creature = u->ToCreature();
 uint32 gain = 0;
 
 if (!creature || creature->CanGiveExperience())
 {
 float xpMod = 1.0f;
 
 gain = BaseGain(player->GetLevel(), u->GetLevelForTarget(player));
 
 if (gain && creature)
 {
 // Players get only 10% xp for killing creatures of lower expansion levels than himself
 if ((uint32(creature->GetCreatureDifficulty()->GetHealthScalingExpansion()) < GetExpansionForLevel(player->GetLevel())))
 gain = uint32(round(gain / 10.0f));
 
 if (creature->IsElite())
 {
 // Elites in instances have a 2.75x XP bonus instead of the regular 2x world bonus.
 if (u->GetMap()->IsDungeon())
 xpMod *= 2.75f;
 else
 xpMod *= 2.0f;
 }
 
 xpMod *= creature->GetCreatureTemplate()->ModExperience;
 }
 
 xpMod *= isBattleGround ? sWorld->getRate(RATE_XP_BG_KILL) : sWorld->getRate(RATE_XP_KILL);
 if (creature && creature->m_PlayerDamageReq) // if players dealt less than 50% of the damage and were credited anyway (due to CREATURE_FLAG_EXTRA_NO_PLAYER_DAMAGE_REQ), scale XP gained appropriately (linear scaling)
 xpMod *= 1.0f - 2.0f * creature->m_PlayerDamageReq / creature->GetMaxHealth();
 
 gain = uint32(gain * xpMod);
 }
 
 sScriptMgr->OnGainCalculation(gain, player, u);
 return gain;
 }
 
 inline float xp_in_group_rate(uint32 count, bool isRaid)
 {
 float rate;
 
 if (isRaid)
 {
 // FIXME: Must apply decrease modifiers depending on raid size.
 // set to < 1 to, so client will display raid related strings
 rate = 0.99f;
 }
 else
 {
 switch (count)
 {
 case 0:
 case 1:
 case 2:
 rate = 1.0f;
 break;
 case 3:
 rate = 1.166f;
 break;
 case 4:
 rate = 1.3f;
 break;
 case 5:
 default:
 rate = 1.4f;
 }
 }
 
 sScriptMgr->OnGroupRateCalculation(rate, count, isRaid);
 return rate;
 }
 } // namespace Trinity::XP
 
 namespace Currency
 {
 inline uint32 ConquestRatingCalculator(uint32 rate)
 {
 if (rate <= 1500)
 return 1350; // Default conquest points
 else if (rate > 3000)
 rate = 3000;
 
 // http://www.arenajunkies.com/topic/179536-conquest-point-cap-vs-personal-rating-chart/page__st__60#entry3085246
 return uint32(1.4326 * ((1511.26 / (1 + 1639.28 / exp(0.00412 * rate))) + 850.15));
 }
 
 inline uint32 BgConquestRatingCalculator(uint32 rate)
 {
 // WowWiki: Battleground ratings receive a bonus of 22.2% to the cap they generate
 return uint32((ConquestRatingCalculator(rate) * 1.222f) + 0.5f);
 }
 } // namespace Trinity::Currency
} // namespace Trinity
 
#endif