Lua Function Monster onSelectTarget(self, target)

Marcelo Druida · Jul 26, 2015

Hello!

This code makes it possible to include some script when the monster sets a target.

monster.cpp

find:
bool Monster::selectTarget(Creature* creature)

replace:

Code:

bool Monster::selectTarget(Creature* creature)
{
    if (!isTarget(creature)) {
        return false;
    }

    auto it = std::find(targetList.begin(), targetList.end(), creature);
    if (it == targetList.end()) {
        //Target not found in our target list.
        return false;
    }

    if (isHostile() || isSummon()) {
        if (executeOnSelectTarget(creature) == 1){
            if (setAttackedCreature(creature) && !isSummon()) {
                    g_dispatcher.addTask(createTask(std::bind(&Game::checkCreatureAttack, &g_game, getID())));
            }
        }
        else
            return false;
    }
    return setFollowCreature(creature);
}

bool Monster::executeOnSelectTarget(Creature* creature){

    // onSelectTarget(self, target)
    if (mType->targetEvent != -1) {
        LuaScriptInterface* scriptInterface = mType->scriptInterface;

        if (!scriptInterface->reserveScriptEnv()) {
            std::cout << "[Error - Monster::onSelectTarget] Call stack overflow" << std::endl;
            return true;
        }

        ScriptEnvironment* env = scriptInterface->getScriptEnv();
        env->setScriptId(mType->targetEvent, scriptInterface);

        lua_State* L = scriptInterface->getLuaState();
        scriptInterface->pushFunction(mType->targetEvent);

        LuaScriptInterface::pushUserdata<Monster>(L, this);
        LuaScriptInterface::setMetatable(L, -1, "Monster");

        LuaScriptInterface::pushUserdata(L, creature);
        LuaScriptInterface::setCreatureMetatable(L, -1, creature);

        return (scriptInterface->callFunction(2));
    }
    return true;
}

monster.h
find:
bool selectTarget(Creature* creature);
add:
bool executeOnSelectTarget(Creature* creature);

monsters.cpp:
find:

Code:

    scriptInterface = nullptr;
    creatureAppearEvent = -1;
    creatureDisappearEvent = -1;
    creatureMoveEvent = -1;
    creatureSayEvent = -1;
    thinkEvent = -1;

add:
targetEvent = -1;

find:
mType->thinkEvent = scriptInterface->getEvent("onThink");
add:
mType->targetEvent = scriptInterface->getEvent("onSelectTarget");

monsters.h:

find:
int32_t thinkEvent;
add:
int32_t targetEvent;

Improvement:
If you want to set a global target event (all monsters will follow the rule):

monsters.cpp:

find:
Monsters::loadMonster

add:
before return true

Code:

  if (!scriptInterface) {
     scriptInterface.reset(new LuaScriptInterface("Monster Interface"));
     scriptInterface->initState();
   }

   if (scriptInterface->loadFile("data/monster/scripts/global.lua") == 0) {
     mType->scriptInterface = scriptInterface.get();
     mType->globalTargetEvent = scriptInterface->getEvent("onSelectTarget");
   }

find:

Code:

scriptInterface = nullptr;
creatureAppearEvent = -1;
creatureDisappearEvent = -1;
creatureMoveEvent = -1;
creatureSayEvent = -1;
thinkEvent = -1;
targetEvent = -1;

add:
globalTargetEvent = -1;

monsters.h

find:
int32_t thinkEvent;
add:
int32_t globalTargetEvent;

create monster/scripts/global.lua:
function onSelectTarget(self, target)
print(self:getName())
return true
end

Marcelo Druida · Jul 27, 2015

TFS 1.2

little example:

Code:

function onSelectTarget(self, target)

-- race VENOM only attack players of lvl 100+
if self:getRace() == RACE_VENOM and target:getLevel() >= 100 then
      return true
end

return false
end

Tip: monster:getTargetList() may be useful

Rebine · Jul 27, 2015

Thanks!

Codinablack · Jul 27, 2015

Hells yeah! Great for lua AI system, thanks man!

Mokerhamer · Sep 12, 2015

monster.h

find
int32_t thinkEvent;

add:
int32_t targetEvent;

Love it thank you!

Marcelo Druida · Sep 14, 2015

Code improved.

Thanks for feedback!!

ShadowZim · Sep 28, 2015

can addapt this code for tsf 0.3.6 pl1??? its a very good code, thanks very, very much

Marcelo Druida · Sep 29, 2015

sorry, there isnt monster scripting at 0.3.6

Nazubal27 · Dec 28, 2015

Hey, on TFS 1.2 (I think), int32_t thinkEvent; is in monsters.h not monster.h

Idk if this is a typo or different on your version.

Marcelo Druida · Dec 28, 2015

thanks!

grafit · Jan 2, 2016

can i use with NPC's?

Marcelo Druida · Jan 2, 2016

as default, TFS 1.x's npcs dont attack creatures, so no you cant
if you make NPCs attacking creatures and include LUA scripting onSelectTarget, then yes you can

StreamSide · Jul 12, 2016

global.lua isnt working

kito2 · Oct 1, 2016

Seems smart to configure AI of some bosses, good job.

LaloHao · Nov 5, 2016

Marcelo Druida said:
TFS 1.2

little example:

Code:

function onSelectTarget(self, target) -- race VENOM only attack players of lvl 100+ if self:getRace() == RACE_VENOM and target:getLevel() >= 100 then return true end return false end

Tip: monster:getTargetList() may be useful

Wouldnt that allow the player to kill those monsters without being attacked?

Danger II · Nov 5, 2016

LaloHao said:
Wouldnt that allow the player to kill those monsters without being attacked?

Good question!

I think this is more like a example script, but yeah. The player could kill these monsters without getting attack.

Marcelo Druida · Nov 5, 2016

LaloHao said:
Wouldnt that allow the player to kill those monsters without being attacked?

You got the point.
Tbh I did not take advantage of this function. On the release I've just wrote some stupid code.
Would make sense if it only attacks <= 100

If any of you can suggest a better example I'd alter

LaloHao · Nov 5, 2016

Marcelo Druida said:
You got the point.
Tbh I did not take advantage of this function. On the release I've just wrote some stupid code.
Would make sense if it only attacks <= 100

If any of you can suggest a better example I'd alter

I actually wanted to ask for a use case too

Marcelo Druida · Nov 7, 2016

using a script you can set in the monster' behaviour to not target a Elite Knight but a mage
or the weaker player in the screen

jmarkos · Nov 18, 2016

Thanks for the contribuition bro.

Lua Function Monster onSelectTarget(self, target)

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