[core] Adjust draw-in behavior and add additional functionality

scripts/enum/mob_mod.lua

@@ -91,4 +91,7 @@ xi.mobMod =
     SKIP_ALLEGIANCE_CHECK  = 80, -- Skip the allegiance check for valid target (allows for example a mob to cast a TARGET_ENEMY spell on itself)
     ABILITY_RESPONSE       = 81, -- Mob can respond to player ability use with onPlayerAbilityUse()
     SPEED_BOOST_MULT       = 82, -- Multiplier for the base speed of a mob when the mob's target is out of range (range between 100 and 500, 250 means 2.5x, mechanism is from retail)
+    DRAW_IN_FRONT          = 83, -- Mob will draw in slightly in front of them instead of the center of their hitbox (HNMs such as Tiamat)
+    DRAW_IN_CUSTOM_RANGE   = 84, -- Override the default range of MeleeRange*2 of when players start to get drawn-in
+    DRAW_IN_BIND           = 85, -- Forces mob to draw in the moment you leave melee range (ex. Mimics)
 }

src/map/ai/controllers/mob_controller.cpp

@@ -708,9 +708,19 @@ void CMobController::Move()
         if (((currentDistance > closeDistance) || move) && PMob->PAI->CanFollowPath())
         {
             // TODO: can this be moved to scripts entirely?
-            if (PMob->getMobMod(MOBMOD_DRAW_IN) > 0)
+            if (PMob->getMobMod(MOBMOD_DRAW_IN))
             {
-                if (currentDistance >= PMob->GetMeleeRange() * 2 && battleutils::DrawIn(PTarget, PMob, PMob->GetMeleeRange() - 0.2f))
+                uint8 drawInRange = PMob->getMobMod(MOBMOD_DRAW_IN_CUSTOM_RANGE) > 0 ? PMob->getMobMod(MOBMOD_DRAW_IN_CUSTOM_RANGE) : PMob->GetMeleeRange() * 2;
+
+                // Draw in when target is farther than 2x melee range
+                if (currentDistance > drawInRange && battleutils::DrawIn(PTarget, PMob, PMob->GetMeleeRange() - 0.2f, drawInRange))
+                {
+                    FaceTarget();
+                    return;
+                }
+                // If i'm bound/can't move, draw in the moment they leave my melee range
+                else if (PMob->getMobMod(MOBMOD_DRAW_IN_BIND) && (PMob->speed == 0 || PMob->getMobMod(MOBMOD_NO_MOVE)) &&
+                    currentDistance > PMob->GetMeleeRange() && battleutils::DrawIn(PTarget, PMob, PMob->GetMeleeRange() - 1.2f, PMob->GetMeleeRange()))
                 {
                     FaceTarget();
                     return;

src/map/lua/lua_baseentity.cpp

@@ -17172,7 +17172,8 @@ void CLuaBaseEntity::drawIn(sol::variadic_args va)
         return;
     }
 
-    auto mobObj = dynamic_cast<CMobEntity*>(m_PBaseEntity);
+    auto   mobObj      = dynamic_cast<CMobEntity*>(m_PBaseEntity);
+    float  drawInRange = mobObj->GetMeleeRange() * 2;
 
     if (va.size() == 0)
     {
@@ -17182,7 +17183,7 @@ void CLuaBaseEntity::drawIn(sol::variadic_args va)
         {
             return;
         }
-        battleutils::DrawIn(defaultTarget, mobObj, mobObj->GetMeleeRange() - 0.2f);
+        battleutils::DrawIn(defaultTarget, mobObj, mobObj->GetMeleeRange() - 0.2f, drawInRange);
         return;
     }
 
@@ -17204,7 +17205,7 @@ void CLuaBaseEntity::drawIn(sol::variadic_args va)
 
     if (PTarget)
     {
-        battleutils::DrawIn(PTarget, mobObj, mobObj->GetMeleeRange() - 0.2f);
+        battleutils::DrawIn(PTarget, mobObj, mobObj->GetMeleeRange() - 0.2f, drawInRange);
     }
 
     return;

src/map/mob_modifier.h

@@ -111,6 +111,9 @@ enum MOBMODIFIER : int
     MOBMOD_SKIP_ALLEGIANCE_CHECK  = 80, // Skip the allegiance check for valid target (allows for example a mob to cast a TARGET_ENEMY spell on itself)
     MOBMOD_ABILITY_RESPONSE       = 81, // Mob can respond to player ability use with onPlayerAbilityUse()
     MOBMOD_SPEED_BOOST_MULT       = 82, // Multiplier for the base speed of a mob when the mob's target is out of range (range between 100 and 25500, 250 means 2.5x, mechanism is from retail)
+    MOBMOD_DRAW_IN_FRONT          = 83, // Mob will draw in slightly in front of them instead of the center of their hitbox (HNMs such as Tiamat)
+    MOBMOD_DRAW_IN_CUSTOM_RANGE   = 84, // Override the default range of MeleeRange*2 of when players start to get drawn-in
+    MOBMOD_DRAW_IN_BIND           = 85, // Forces mob to draw in the moment you leave melee range (ex. Mimics)
 };
 
 #endif

src/map/utils/battleutils.cpp

@@ -5595,8 +5595,16 @@ namespace battleutils
         }
     }
 
-    bool DrawIn(CBattleEntity* PTarget, CMobEntity* PMob, float offset)
+    bool DrawIn(CBattleEntity* PTarget, CMobEntity* PMob, float offset, float drawInRange)
     {
+        // Check if time to draw in again, if not then exit
+        uint64 timeStamp = std::chrono::time_point_cast<std::chrono::seconds>(server_clock::now()).time_since_epoch().count();
+
+        if (timeStamp - PMob->GetLocalVar("DrawInTime") < 2)
+        {
+            return false;
+        }
+
         position_t& pos        = PMob->loc.p;
         position_t  nearEntity = nearPosition(pos, offset, (float)0);
 
@@ -5622,19 +5630,13 @@ namespace battleutils
         // Move the target a little higher, just in case
         nearEntity.y -= 1.0f;
 
-        bool  success        = false;
-        float drawInDistance = (float)(PMob->getMobMod(MOBMOD_DRAW_IN) > 1 ? PMob->getMobMod(MOBMOD_DRAW_IN) : PMob->GetMeleeRange() * 2);
-
-        if (std::chrono::time_point_cast<std::chrono::seconds>(server_clock::now()).time_since_epoch().count() - PMob->GetLocalVar("DrawInTime") < 2)
-        {
-            return false;
-        }
+        bool success = false;
 
-        std::function<void(CBattleEntity*)> drawInFunc = [PMob, drawInDistance, &nearEntity, &success](CBattleEntity* PMember)
+        const auto drawInFunc = [PMob, drawInRange, &nearEntity, &success](CBattleEntity* PMember)
         {
             float pDistance = distance(PMob->loc.p, PMember->loc.p);
 
-            if (PMob->loc.zone == PMember->loc.zone && pDistance > drawInDistance && PMember->status != STATUS_TYPE::CUTSCENE_ONLY)
+            if (PMob->loc.zone == PMember->loc.zone && pDistance > drawInRange && PMember->status != STATUS_TYPE::CUTSCENE_ONLY)
             {
                 // don't draw in dead players for now!
                 // see tractor
@@ -5645,9 +5647,21 @@ namespace battleutils
                 else
                 {
                     // draw in!
-                    PMember->loc.p.x = nearEntity.x;
-                    PMember->loc.p.y = nearEntity.y;
-                    PMember->loc.p.z = nearEntity.z;
+                    // Certain families (such as Wyrms) draw in in front of where they are looking
+                    if (PMob->getMobMod(MOBMOD_DRAW_IN_FRONT))
+                    {
+                        PMember->loc.p.x = nearEntity.x;
+                        PMember->loc.p.y = nearEntity.y;
+                        PMember->loc.p.z = nearEntity.z;
+                    }
+                    // Default behavior is to draw in to middle of hit box.
+                    else
+                    {
+                        PMember->loc.p.x = PMob->loc.p.x;
+                        PMember->loc.p.y = nearEntity.y;
+                        PMember->loc.p.z = PMob->loc.p.z;
+                        PMember->loc.p.rotation = PMob->loc.p.rotation;
+                    }
 
                     if (PMember->objtype == TYPE_PC)
                     {

src/map/utils/battleutils.h

@@ -246,7 +246,7 @@ namespace battleutils
     WEATHER GetWeather(CBattleEntity* PEntity, bool ignoreScholar);
     WEATHER GetWeather(CBattleEntity* PEntity, bool ignoreScholar, uint16 zoneWeather);
     bool    WeatherMatchesElement(WEATHER weather, uint8 element);
-    bool    DrawIn(CBattleEntity* PEntity, CMobEntity* PMob, float offset);
+    bool    DrawIn(CBattleEntity* PEntity, CMobEntity* PMob, float offset, float drawInRange);
     void    DoWildCardToEntity(CCharEntity* PCaster, CCharEntity* PTarget, uint8 roll);
     bool    DoRandomDealToEntity(CCharEntity* PChar, CBattleEntity* PTarget);