The following stealth changes are implemented.

 - Combat no longer removes stealth, only damage does
 - Creatures will pursue a stealthed unit they cannot see if they're already in combat with them
 - When a player is ~~3 yards~~ 8% + 1.5 yards away from the usual stealth detection distance, the creature will perform the "alerted" effect.
 - When sitting/sleeping creatures are distracted or alerted, they will stand up
 - Idle movement creatures will return to their original (spawn) orientation after distract/alert
 - When entering combat with a distracted/alerted creature, distract state is removed
 - NPC no longer have a limit to stealth visibility (granted by stealth modifier spells/buffs)
 - If alert visibility is greater than aggro range, no alert sent

1 files changed, 24 insertions, 0 deletions

diff --git a/src/server/game/AI/CreatureAI.cpp b/src/server/game/AI/CreatureAI.cpp
index 96a25588120..d76d106e81a 100644
--- a/src/server/game/AI/CreatureAI.cpp
+++ b/src/server/game/AI/CreatureAI.cpp
@@ -140,6 +140,30 @@ void CreatureAI::MoveInLineOfSight(Unit* who)
     //    me->GetMotionMaster()->MoveChase(who->GetVictim());
 }
 
+// Distract creature, if player gets too close while stealthed/prowling
+void CreatureAI::TriggerAlert(Unit const* who) const
+{
+    // If there's no target, or target isn't a player do nothing
+    if (!who || who->GetTypeId() != TYPEID_PLAYER)
+        return;
+
+    // If this unit isn't an NPC, is already distracted, is in combat, is confused, stunned or fleeing, do nothing
+    if (me->GetTypeId() != TYPEID_UNIT || me->IsInCombat() || me->HasUnitState(UNIT_STATE_CONFUSED | UNIT_STATE_STUNNED | UNIT_STATE_FLEEING | UNIT_STATE_DISTRACTED))
+        return;
+
+    // Only alert for hostiles!
+    if (me->IsCivilian() || me->HasReactState(REACT_PASSIVE) || !me->IsHostileTo(who) || !me->_IsTargetAcceptable(who))
+        return;
+
+    // Send alert sound (if any) for this creature
+    me->SendAIReaction(AI_REACTION_ALERT);
+
+    // Face the unit (stealthed player) and set distracted state for 5 seconds
+    me->SetFacingTo(me->GetAngle(who->GetPositionX(), who->GetPositionY()));
+    me->StopMoving();
+    me->GetMotionMaster()->MoveDistract(5 * IN_MILLISECONDS);
+}
+
 void CreatureAI::EnterEvadeMode()
 {
     if (!_EnterEvadeMode())