Implemented NPC special ability 40 'NPC_CHASE_DISTANCE'

Param 0: Sets max distance you need to be away from an npc for it to chase you.
Param 1: Sets min distance you need to be from npc for it to chase you.
Usage: Ideally used with ranged attack npcs / casters who you DO NOT WANT
to chase you unless you get too close or too far or out of sight.

zone/aggro.cpp

@@ -873,7 +873,30 @@ bool Mob::CombatRange(Mob* other)
 	if (size_mod > 10000)
 		size_mod = size_mod / 7;
 
-	if (DistNoRoot(*other) <= size_mod)
+	float _DistNoRoot = DistNoRoot(*other);
+
+	if (GetSpecialAbility(NPC_CHASE_DISTANCE)){
+		
+		float max_dist = static_cast<float>(GetSpecialAbilityParam(NPC_CHASE_DISTANCE, 0));
+		float min_dist = static_cast<float>(GetSpecialAbilityParam(NPC_CHASE_DISTANCE, 1));
+
+		if (max_dist == 1)
+			max_dist = 250.0f; //Default it to 250 if you forget to put a value
+
+		max_dist = max_dist * max_dist;
+
+		if (!min_dist)
+			min_dist = size_mod; //Default to melee range
+		else
+			min_dist = min_dist * min_dist;
+		
+		if (CheckLastLosState() && (_DistNoRoot >= min_dist && _DistNoRoot <= max_dist))
+			SetPseudoRoot(true); 
+		else 
+			SetPseudoRoot(false);
+	}
+
+	if (_DistNoRoot <= size_mod)
 	{
 		return true;
 	}
@@ -887,6 +910,8 @@ bool Mob::CheckLosFN(Mob* other) {
 	if(other)
 		Result = CheckLosFN(other->GetX(), other->GetY(), other->GetZ(), other->GetSize());
 
+	SetLastLosState(Result);
+	
 	return Result;
 }
 

zone/common.h

@@ -127,7 +127,8 @@ enum {
 	FLEE_PERCENT = 37,
 	ALLOW_BENEFICIAL = 38,
 	DISABLE_MELEE = 39,
-	MAX_SPECIAL_ATTACK = 40
+	NPC_CHASE_DISTANCE = 40,
+	MAX_SPECIAL_ATTACK = 41
 	
 };
 

zone/mob.cpp

@@ -183,6 +183,7 @@ Mob::Mob(const char* in_name,
 	has_MGB = false;
 	has_ProjectIllusion = false;
 	SpellPowerDistanceMod = 0;
+	last_los_check = false;
 
 	if(in_aa_title>0)
 		aa_title	= in_aa_title;
@@ -341,6 +342,7 @@ Mob::Mob(const char* in_name,
 		viral_spells[i] = 0;
 	}
 	pStandingPetOrder = SPO_Follow;
+	pseudo_rooted = false;
 
 	see_invis = in_see_invis;
 	see_invis_undead = in_see_invis_undead != 0;

zone/mob.h

@@ -464,6 +464,8 @@ public:
 	bool CheckLosFN(float posX, float posY, float posZ, float mobSize);
 	inline void SetChanged() { pLastChange = Timer::GetCurrentTime(); }
 	inline const uint32 LastChange() const { return pLastChange; }
+	inline void SetLastLosState(bool value) { last_los_check = value; }
+	inline bool CheckLastLosState() const { return last_los_check; }
 
 	//Quest
 	void QuestReward(Client *c = nullptr, uint32 silver = 0, uint32 gold = 0, uint32 platinum = 0);
@@ -752,7 +754,8 @@ public:
 	inline const bool IsRooted() const { return rooted || permarooted; }
 	inline const bool HasVirus() const { return has_virus; }
 	int GetSnaredAmount();
-
+	inline const bool IsPseudoRooted() const { return pseudo_rooted; }
+	inline void SetPseudoRoot(bool prState) { pseudo_rooted = prState; }
 
 	int GetCurWp() { return cur_wp; }
 
@@ -1119,6 +1122,8 @@ protected:
 	bool has_MGB;
 	bool has_ProjectIllusion;
 	int16 SpellPowerDistanceMod;
+	bool last_los_check;
+	bool pseudo_rooted;
 
 	// Bind wound
 	Timer bindwound_timer;

zone/special_attacks.cpp

@@ -965,6 +965,9 @@ void Mob::DoArcheryAttackDmg(Mob* other, const ItemInst* RangeWeapon, const Item
 
 void NPC::RangedAttack(Mob* other)
 {
+
+	if (!other)
+		return;
 	//make sure the attack and ranged timers are up
 	//if the ranged timer is disabled, then they have no ranged weapon and shouldent be attacking anyhow
 	if((attack_timer.Enabled() && !attack_timer.Check(false)) || (ranged_timer.Enabled() && !ranged_timer.Check()))
@@ -973,6 +976,9 @@ void NPC::RangedAttack(Mob* other)
 		return;
 	}
 
+	if(!CheckLosFN(other))
+		return;
+
 	int attacks = GetSpecialAbilityParam(SPECATK_RANGED_ATK, 0);
 	attacks = attacks > 0 ? attacks : 1;
 	for(int i = 0; i < attacks; ++i) {