Monster AI Scripting
A Monster AI script can execute as a server script when in the project folder/ServerScripts with the file name Hello.lua.
enemy: Represents the unit (ScriptUnit) of the monster.
ai: Represents the action(ScriptEnemyUnitAI) to be performed.
event: Identifies the logic to be executed.
AI_INIT(-1) : Runs when monster AI submitted for the first time, AI_UPDATE (0): Continues every 2 seconds, AI_ATTACKED (1): Runs once on attack, AI_DEAD (2): Runs once when dead
data: Only available on attack (event == 1)
Information such as damage, skill ID, and critical (true/false) can be can be checked on attack.
Example) Server script - Setting Monster AI
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Server.SetMonsterAI(
22, --the index of the monster
function(enemy,ai,event,data)
if (event == 0) then
--returns the unit in the field which fullfills the condition of AI
--E.g, returns units which have hp lower than 100
--ai.SetTargetUnit(
-- enemy.field.FindUnit(enemy.x, enemy.y, 200,
-- function(u)
-- return u.hp <= 100
-- end
--, 0,enemy))
--return unit in the field with minimum value of type passed
--ex) return unit which have minimum hp value
--ai.SetTargetUnit(
-- enemy.field.FindMinimumUnit(enemy.x, enemy.y, 200,
-- function(u)
-- return u.hp
-- end
--, 0,enemy))
--return unit in the field with maximum value of type passed
--ex) return unit which have maximum hp value
--ai.SetTargetUnit(
-- enemy.field.FindMaximumUnit(enemy.x, enemy.y, 200,
-- function(u)
-- return u.hp
-- end
--, 0,enemy))
--Decide a target as the closest player when there is no target chosen
if( ai.GetTargetUnit() == nil) then
ai.SetNearTarget(0,200)
end
--Set the target as null if there are no players on map
if( enemy.field.playerCount <=0) then
ai.SetTargetUnit(nil)
--Decide new target when the target player leaves the map
elseif(enemy.field.GetUnit(ai.GetTargetUnitID()) == nil) then
ai.SetNearTarget(0,200)
end
--Attack to the direction if there is target
ai.UseSkill(22);
--Attack Left side
ai.UseSkill(22,Point(-1,0))
--Attack Right side
ai.UseSkill(22,Point(1,0))
--Attack upwards
ai.UseSkill(22,Point(0,1))
--Attack downwards
ai.UseSkill(22,Point(0,-1))
--Attack to the selected point
ai.UseSkillToPosition(24,Point(150,-150))
--Handle exception if there is no target
if(ai.GetTargetUnit() == nil) then
return
end
--Activate/Deactivate following the target by her HP
if(ai.GetTargetUnit().hp <=150) then
ai.SetFollowTarget(false)
else
ai.SetFollowTarget(true)
end
end
if (event == 1) then
enemy.Say('Attakced!. \nDamage : ' .. data.damage
.. '\nSkillID: '..data.skillDataID
.. '\nIf it was critical shot: '..(data.critical and 'true' or 'false'))
--Handle exception when there is no attacked unit
if(ai.GetAttackedUnit() == nil) then
return
end
--Check the attacker's HP and change the target to him if his HP is lower than 100
if(ai.GetAttackedUnit().hp <= 100) then
ai.SetTargetUnit(ai.GetAttackedUnit())
end
end
if (event == 2) then
Server.SendSay('Dead')
--Respawn at the position after being killed
enemy.RespawnAt(150,-150)
end
end)Example: Server Script - Monster AI for a first-attack monster
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function firstAttack (enemy, ai, event, data)
if (event == 0) then - an event that executes every 2 seconds
- null if no player is on the map
if enemy.field.playerCount <= 0 then
ai.SetTargetUnit (nil)
- If there is no target, or if the existing target unit exits the map, or if the x or y value difference exceeds 300
- initializes target to nil and sets target within range of 200
elseif (ai.GetTargetUnit () == nil)
or (enemy.field.GetUnit (ai.GetTargetUnitID ()) == nil)
or (math.abs (enemy.x-enemy.field.GetUnit (ai.GetTargetUnitID ()). x) & gt; = 300)
or (math.abs (enemy.y-enemy.field.GetUnit (ai.GetTargetUnitID ()). y) & gt; = 300) then
if ai.GetTargetUnit () ~ = nil then
enemy.say ('Target has disappeared ..')
end
ai.SetFollowTarget (false) - disable tracing if target disappears
ai.SetTargetUnit (nil)
ai.SetNearTarget (0,200)
- If you have found the target after looking around (not nil), enables tracing (true), and prints the message
if ai.GetTargetUnit () ~ = nil then
ai.SetFollowTarget (true)
enemy.say ('Target found! \ n Tracking started!')
end
end
- If there is a target, fires 10 skills toward the target direction.
if ai.GetTargetUnit () ~ = nil then
ai.UseSkill (10)
end
- Handles exception when there is no target
if ai.GetTargetUnit () == nil then
return
end
end
if (event == 1) then - the event that is fired each time the monster is attacked
- Exception handling when there is no attacked unit
if ai.GetAttackedUnit () == nil then
return
else
- When the existing target unit and the attacking unit are not the same, the attacking unit is targeted or changed to and then tracked
if ai.GetTargetUnit () ~ = ai.GetAttackedUnit () then
ai.SetTargetUnit (ai.GetAttackedUnit ())
ai.SetFollowTarget (true)
enemy.say ('Tracking new attackers ..')
end
- When a monster is attacked, it has 5% chance of attacking with a 10% probability, and sends message to the entire server.
if math.random (0,99) <= 9 then
ai.UseSkill (5)
Server.SendCenterLabel ('<color = # FF0000> growl !! </ color> \ nYour stupid boss is crying!')
end
end
end
end
Server.SetMonsterAI (1, firstAttack) - apply firstAttack to monster number 1