Need help with lua? - LunaLua General Help

[PixelPest]

You can call NPC:transform() with the new ID in the brackets

[Hoeloe]

Okay, so long ago autocode let you change all instances of an npc with another, which was good to make things like spiny eggs turning into blocks and other things like that.
Is there an equivalent to that?

Literally everything Autocode could do, Lua can do.

In this case, you want to use 3 things:

1) NPC.get() - This will get you a list of all the NPCs in the level. Feeding it an ID will get you all NPCs of a specific ID.
2) for k,v in ipairs(list) do - This will run some code once for each object in a list. When you do this, the value of v will be the object at that point in the list, while k will be the position of that object in the list. You don't really need to care about k in this instance.
3) npc:transform(newid) - There is an API called ClassExpander, which I believe is loaded by default (I'm not 100% sure if this is true in Beta 3 though). This API allows access to a transform function for NPCs, that will change the NPC in a clean and safe way.

[IttaBaby]

Literally everything Autocode could do, Lua can do.

In this case, you want to use 3 things: Helpful stuff

Can I have an example, maybe? I'm still not getting it...

[Emral]

For the third time,
Answer would be greatly appreciated.

Take a look at Hypnosis Redo's lunaworld, maybe. Looks like it's draining the coin reserves and storing them itself.

Is Hypnosis Redo in the 2k1x series? Thanks btw.

Yes and yes.
The default counter flows back to 0 after reaching 100 so I check when coins are in that pool and move them over to a custom one.
As for the red coin counter, I think adding to a counter when a red coin npc is collected should work? You can use onNPCKill and check for killreason 9 (despawn) which also is for collection of items. To make sure it doesn't count up when a coin naturally despawns, check if it is close to the player.

Literally everything Autocode could do, Lua can do.

In this case, you want to use 3 things: Helpful stuff

Can I have an example, maybe? I'm still not getting it...

Use combine the things he said:

Code: Select all

function onTick() --every frame
	for k,v in pairs(NPC.get(myID, sectionNumber)) do --loop over every npc of id "myID" (integer) in section sectionnumber (section 1 is 0, 2 is 1, etc)
		v:transform(newID) --transform each element into an npc with the id newID (within a k,v for loop, element v is the "k"th element in the table it loops over.
	end
end

[IttaBaby]

Literally everything Autocode could do, Lua can do.

In this case, you want to use 3 things: Helpful stuff

Can I have an example, maybe? I'm still not getting it...

Use combine the things he said:

Code: Select all

function onTick() --every frame
	for k,v in pairs(NPC.get(myID, sectionNumber)) do --loop over every npc of id "myID" (integer) in section sectionnumber (section 1 is 0, 2 is 1, etc)
		v:transform(newID) --transform each element into an npc with the id newID (within a k,v for loop, element v is the "k"th element in the table it loops over.
	end
end

Thank you all so much "orz

[IttaBaby]

I get the feeling I'm going to frequent this topic >w>;
So I'm trying to load up Textblox but I don't know how to use it. I've got it to replace messages, but I'm looking to customize the windows, and the instructions say to customize a table, but I'm not sure how...

While I'm here, is there a way to make a character zip forwards a bit when a button is pressed, like a dash/air dash?

[Gamma_Metroid]

I'm trying to have an event occur when five dragon coins are collected, but whenever I try to access the memory offset where that's stored, SMBX crashes. I commented out all other code besides this:

Code: Select all

function onStart()
tokens = mem(0x05844B7C, FIELD_WORD)
end

and it still happens. This is the stacktrace it shows me when it crashes:

Code: Select all

**** THE STACKTRACE ****
0: c:\_repos\lunalua\lunadll\misc\miscfuncs.cpp (391): GetMem
1: c:\_repos\lunalua\lunadll\luamain\luaproxycomponent\luaproxyglobalfunctions.cpp (237): LuaProxy::mem
2: c:\_repos\lunalua\lunadll\libs\luabind-include\luabind\detail\call.hpp (283): luabind::detail::invoke_normal<luabind::adl::object (__cdecl*)(int,enum LuaProxy::L_FIELDTYPE,lua_State *),boost::mpl::vector4<luabind::adl::object,int,enum LuaProxy::L_FIELDTYPE,lua_State *>,luabind::detail::null_type>
3: c:\_repos\lunalua\lunadll\libs\luabind-include\luabind\make_function.hpp (63): luabind::detail::function_object_impl<luabind::adl::object (__cdecl*)(int,enum LuaProxy::L_FIELDTYPE,lua_State *),boost::mpl::vector4<luabind::adl::object,int,enum LuaProxy::L_FIELDTYPE,lua_State *>,luabind::detail::null_type>::entry_point
4: 0F8127FA (LunaDll): (filename not available): lj_BC_FUNCC
5: 0F985EC6 (LunaDll): (filename not available): lua_pcall
6: 0F83EF20 (LunaDll): (filename not available): luabind::detail::pcall
7: c:\_repos\lunalua\lunadll\libs\luabind-include\luabind\detail\call_function.hpp (264): luabind::detail::proxy_function_void_caller<boost::tuples::tuple<std::shared_ptr<Event> const *,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type> >::~proxy_function_void_caller<boost::tuples::tuple<std::shared_ptr<Event> const *,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type> >
8: c:\_repos\lunalua\lunadll\luamain\lunaluamain.h (69): CLunaLua::callLuaFunction<lua_State *,char const *,std::shared_ptr<Event> >
9: c:\_repos\lunalua\lunadll\luamain\lunaluamain.cpp (1439): CLunaLua::doEvents
10: c:\_repos\lunalua\lunadll\main.cpp (206): TestFunc
11: 008CA240 (smbx): (filename not available): (function-name not available)
12: 008C224A (smbx): (filename not available): (function-name not available)
13: 6600A048 (MSVBVM60): (filename not available): EbLoadRunTime
14: 66007B3E (MSVBVM60): (filename not available): BASIC_CLASS_QueryInterface
15: 66003981 (MSVBVM60): (filename not available): ThunRTMain
16: 660036FA (MSVBVM60): (filename not available): ThunRTMain
17: 66003600 (MSVBVM60): (filename not available): ThunRTMain
18: 0040BDE2 (smbx): (filename not available): (function-name not available)
19: 77AD0FD9 (ntdll): (filename not available): RtlSubscribeWnfStateChangeNotification
20: 77AD0FA4 (ntdll): (filename not available): RtlSubscribeWnfStateChangeNotification

[The0x539]

I'm trying to have an event occur when five dragon coins are collected, but whenever I try to access the memory offset where that's stored, SMBX crashes. I commented out all other code besides this:

Code: Select all

function onStart()
tokens = mem(0x05844B7C, FIELD_WORD)
end

and it still happens.

I cannot reproduce this crash using an exact copy-paste of your code.

[Gamma_Metroid]

Huh. I'm using multipoints in this level as well, so I deleted the LuaData_Save0_Multipoints.txt file and it doesn't crash any more. Not sure what happened there.

Anyway, now I've run into another problem: The dragon coin value seems to be stuck at -1, or at least that's what's being displayed when I try to print it to the screen every tick.

[PixelPest]

Anyway, now I've run into another problem: The dragon coin value seems to be stuck at -1, or at least that's what's being displayed when I try to print it to the screen every tick.

That's because onStart() only runs once. Grab the value of the mem field in onTick() so that you get the updated values each frame

[Gamma_Metroid]

I am. This is all my relevant code:

Code: Select all

function onStart()
	tokens = mem(0x05844B7C, FIELD_WORD)
	tokenGoal = tokens + 5
end

function onTick()
	if (player:mem(0xF0,FIELD_WORD) == 1) then
		Text.print("TOKENS = " .. tokens,3,180,50)
	end
	if (player:mem(0xF0,FIELD_WORD) == 18) then
		Text.print("TOKENS = " .. tokens,3,5,80)
	end
	if not(tokens == mem(0x05844B7C, FIELD_WORD)) then
		if (tokens == tokenGoal) then
			triggerEvent("open tourian gate")
		end
	end
	tokens = mem(0x05844B7C, FIELD_WORD)
end

I did it this way so it only checks whether the goal is reached once, not repeatedly. I did it in another level with regular coins and it worked fine, so I'm not sure what's wrong here.

EDIT: The crashing has come back, and deleting that file doesn't seem to fix it this time. Also, I've confirmed that the game is keeping track of the dragon coins, because the event does occur when five have been collected, but it still shows -1 on the screen all the time.

EDIT2: It shows -1 when testing from PGE, and 0 when playing the whole episode normally

Just to be perfectly clear, I'm sure it's the dragon coin memory address that's doing this. If I switch all instances of that memory address with the one for the regular coin count, it works exactly as it should.

It occurred to me that maybe the address (which I got here) is incorrect... but I would think someone would have noticed that before now. Does anyone know if that's correct?

EDIT: I tried changing the calls to "global:mem(0x05844B7C, FIELD_WORD)" just to see what would happen, and it threw a lua error and just didn't load the lua file, so I played around a little bit before changing it back. Now it's displaying 7196 all the time.... It's like something is interfering with what that memory address is reading from. Sometimes it reads from one place, sometimes another place. But regardless of what is displayed, the code that triggers an event when all five are collected still works....

This is what I have currently:

Code: Select all

function onStart()
	tokens = mem(0x05844B7C, FIELD_WORD)
end

function onTick()
	if (player:mem(0xF0,FIELD_WORD) == 1) then
		Text.print("TOKENS = " .. tokens,3,180,50)
	end
	if (player:mem(0xF0,FIELD_WORD) == 18) then
		Text.print("TOKENS = " .. tokens,3,5,80)
	end
	if not(tokens == mem(0x05844B7C, FIELD_WORD)) then
		if (tokens == 5) then
			triggerEvent("open tourian gate")
		end
	end
	tokens = mem(0x05844B7C, FIELD_WORD)
end

EDIT2: Turns out the event is still being triggered by the layer of dragon coins being empty, which I had done before trying to get it with lua. So that's fine, but it doesn't solve the problem of the crashes or the displayed number.

[PixelPest]

That memory field is buggy iirc so it'd probably work to just increase a counter (that starts at 0) each time a Dragon Coin is collected (probably through the onNPCKill() event)

[PersonNamedUser]

Code: Select all

local lineguide = API.load("lineguide")
local hasGenerated = false;
local hasTransformed = false; --if we've transformed an egg or not
local ran;
local frameCount = 0;
local pnpc = API.load("pnpc"); --init pnpc.lua API

timerApi = loadAPI("leveltimer");
lineguide.lineNpcs = {155, 172, 26}

function OnStart()
lineguide.registerNpcs({155, 172, 26})
end

function onLoad()
     timerApi.setSecondsLeft(600);
     timerApi.setTimerState(true);
end

function onTick()
      for _, n in pairs(NPC.get(40, -1)) do
            n.id = 172
      end
end

function onTick() --run the code every tick (a unit of time); most logic for NPCs, etc. is performed in this event
   for _, v in pairs(NPC.get(39)) do
      local birdo = pnpc.wrap(v);
   
      for _, w in pairs(NPC.getIntersecting(v.x, v.y, v.x + v.width, v.y + v.height)) do --iterate over all NPCs that are intersecting with its hitbox
         if w.id == 40 then --if the NPC is an egg
            birdo.data.megg = pnpc.wrap(w).uid; --get the unique identifier of the hammer and save it to the Hammer Bro's data table
            w.friendly = true;
            w:transform(172);
         end
      end
   end
   
   for _, x in pairs(NPC.get(172)) do --iterate over all SMB1 green shells
      local shellID = pnpc.wrap(x).uid; --get the unique identifier of the shell
      local intersects = false; --a variable that will be set to true if the shell is still intersecting with the Hammer Bro that threw it
      
      for _, y in pairs(NPC.getIntersecting(x.x, x.y, x.x + x.width, x.y + x.height)) do --iterate over all NPCs that are intersecting with the shell
         if (y.id == 39) and (pnpc.wrap(y).data.megg == shellID) then --if the NPC is a Hammer Bro and its data table reference for "mHammer" is the shell's uid
            intersects = true; --the shell intersects still with the Hammer Bro that threw it, so this variable is set to true
         end
      end
      
      if not intersects then --if the variable intersects is false
         x.friendly = false; --make the shell not be friendly
      else --if the variable intersects is true
         x.friendly = true; --make the shell be friendly
      end
   end
end

function onNPCKill(eventObj, killedNPC, killReason) --an event run every time an NPC is killed; makes sure that if a Hammer Bro is killed before the shell it threw is set to not friendly (the shell was intersecting with the bro when it was killed still) that the shell is set to not friendly
   if killedNPC.id == 40 then --if the killed NPC is a Hammer Bro
      for _, v in pairs(NPC.get(172)) do --iterate over all shells
         if pnpc.wrap(killedNPC).data.megg == pnpc.wrap(v).uid then
            v.friendly = false;
         end
      end
   end
end

nigga what
basically, lineguide just stopped working one day for no reason

[The0x539]

Code: Select all

local lineguide = API.load("lineguide")
local hasGenerated = false;
local hasTransformed = false; --if we've transformed an egg or not
local ran;
local frameCount = 0;
local pnpc = API.load("pnpc"); --init pnpc.lua API

timerApi = loadAPI("leveltimer");
lineguide.lineNpcs = {155, 172, 26}

function OnStart()
lineguide.registerNpcs({155, 172, 26})
end

function onLoad()
     timerApi.setSecondsLeft(600);
     timerApi.setTimerState(true);
end

function onTick()
      for _, n in pairs(NPC.get(40, -1)) do
            n.id = 172
      end
end

function onTick() --run the code every tick (a unit of time); most logic for NPCs, etc. is performed in this event
   for _, v in pairs(NPC.get(39)) do
      local birdo = pnpc.wrap(v);
   
      for _, w in pairs(NPC.getIntersecting(v.x, v.y, v.x + v.width, v.y + v.height)) do --iterate over all NPCs that are intersecting with its hitbox
         if w.id == 40 then --if the NPC is an egg
            birdo.data.megg = pnpc.wrap(w).uid; --get the unique identifier of the hammer and save it to the Hammer Bro's data table
            w.friendly = true;
            w:transform(172);
         end
      end
   end
   
   for _, x in pairs(NPC.get(172)) do --iterate over all SMB1 green shells
      local shellID = pnpc.wrap(x).uid; --get the unique identifier of the shell
      local intersects = false; --a variable that will be set to true if the shell is still intersecting with the Hammer Bro that threw it
      
      for _, y in pairs(NPC.getIntersecting(x.x, x.y, x.x + x.width, x.y + x.height)) do --iterate over all NPCs that are intersecting with the shell
         if (y.id == 39) and (pnpc.wrap(y).data.megg == shellID) then --if the NPC is a Hammer Bro and its data table reference for "mHammer" is the shell's uid
            intersects = true; --the shell intersects still with the Hammer Bro that threw it, so this variable is set to true
         end
      end
      
      if not intersects then --if the variable intersects is false
         x.friendly = false; --make the shell not be friendly
      else --if the variable intersects is true
         x.friendly = true; --make the shell be friendly
      end
   end
end

function onNPCKill(eventObj, killedNPC, killReason) --an event run every time an NPC is killed; makes sure that if a Hammer Bro is killed before the shell it threw is set to not friendly (the shell was intersecting with the bro when it was killed still) that the shell is set to not friendly
   if killedNPC.id == 40 then --if the killed NPC is a Hammer Bro
      for _, v in pairs(NPC.get(172)) do --iterate over all shells
         if pnpc.wrap(killedNPC).data.megg == pnpc.wrap(v).uid then
            v.friendly = false;
         end
      end
   end
end

nigga what
basically, lineguide just stopped working one day for no reason

Two onTick functions and a capital O in what's supposed to be onStart???

[PersonNamedUser]

Are you able to make an item add seconds to the leveltimer, like the api i mean, upon collecting it?

[PixelPest]

Something along the lines of: leveltimer.setSecondsLeft(leveltimer.getSecondsLeft() + #);

(Those are the functions iirc)

[PersonNamedUser]

This is a pretty basic question, but how do you make projectiles that bounce off walls?

[PixelPest]

Check out the bouncing Podoboos in Beta 3

[IttaBaby]

In SMBX2, is there a way to force a costume?

[PixelPest]

In SMBX2, is there a way to force a costume?

Just copy the files into the level/episode folder