Is it possible to assign a function to a table, as opposed to the function result?
Language: lualocal function foo() print("a") end local function cool() print("c") end local t = {foo, function() print("b") end} -- either use the function name, or define it in there table.insert(t,cool) -- or insert it later t["DoTheThing"] = function() print("d") end -- or just set it t[1]() -- prints a t[2]() -- prints b t[3]() -- prints c t["DoTheThing"]() -- prints d
Is there a method to change the orientation (i.e. rotate) lua's displayed output?
in the beginning of the code. After the manipulations, you could save the image and print it in the BizHawk screen, but this sounds laggy if you wanna update the image every frame. You'll have to experiment solutions.Language: luagd = require"gd"
A small explaination: First it reads from the RNG adress, then multiplies it by 0x41C64E6D, and keeps the last 32 significant bits. So if the value after multiplying was 0x273219DA6F3, then the value of r0 would be 0x219DA6F3. I tried to re-implement this in Lua, but my problem is that the numbers in Lua don't have enough precision to deal with such large values. And I don't need to be able to only get the result of the multiplication, but also to be able to get the last 32 bits. So I tried with a library Masterjun recommended me, BigNum, and it somewhat works but it's old (when I renamed some function which was needed for it to run, it gave me a wrong result for multiplication) Would there be any way to implement this?Language: asmROM:0800F908 LDR R3, =0x30016C0 ROM:0800F90A LDR R2, [R3] ROM:0800F90C LDR R0, =0x41C64E6D ROM:0800F90E MUL R0, R2
I tried to re-implement this in Lua, but my problem is that the numbers in Lua don't have enough precision to deal with such large values.
Would there be any way to implement this?
will work.Language: lualocal result = value % 0x100000000
They do, though. Numbers are in double-precision floating-point format, which can accurately represent integers up to 53 bits.
Arguments a and b are strings in base base. The base is optional and 10 if not given. The result is a string in base base. Example: mult("B65698F7","41C64E6D",16) gives "2ED93BAD0B84632B". The last 32 significant bits are just the last 8 characters, so result = mult("B65698F7","41C64E6D",16) print(result:sub(-8)) gives 0B84632B. (Additional symbols have to be added to chars for higher bases than 16).Language: lualocal chars = {"0","1","2","3","4","5","6","7","8","9","A","B","C","D","E","F"} function add(a,b,base) base = base or 10 local ret = "" while a:sub(1,1)==chars[1] and #a>1 do a=a:sub(2) end while b:sub(1,1)==chars[1] and #b>1 do b=b:sub(2) end while #a<#b do a=chars[1]..a end while #b<a>= base then cur = cur - base c = true end ret = chars[cur+1]..ret end if c then ret = chars[2]..ret end return ret end function mult(a,b,base) base = base or 10 local ret = "" while #a<#b do a=chars[1]..a end while #b<#a do b=chars[1]..b end for i = 1,#a do ret = ret..chars[1] for i=1,tonumber(a:sub(i,i),base) do ret = add(ret,b,base) end end return ret end
Which may not be enough when you're multiplying two 32-bit integers.
Language: luafunction mul(value) local high = (value * 0x41C6) % 0x10000 local low = (value * 0x4E6D) % 0x100000000 return (low + high * 0x10000) % 0x100000000 end
Then have npcs 1,2,3...N all refer to copies of that class. I realized I have no idea how to do this other than copypasting the above N amount of times. Searching for lua classes gave this, but I'm not exactly sure how to implement it. Any hints please?Language: lualocal Enemy_data = { Level, HP_Max, HP_Now, DP, Speed, Attack, Defence, Special, Nature, FD, Friend, Attack1, Attack2, Attack3, Attack4 }
Reading it wouldn't be too hard, either.Language: lualocal function GetStats(addr,o) o= o or {} --Construct a table if we didn't get one o.HP_Now= memory.read_u16_le(addr+0x00) --... And so on return o end local Enemy= {} for i= 1, 6 do Enemy[i]= GetStats(0x8000 + i*0x60) end
This is sort of what I'm thinking of. Is this the right sort of direction you want? Or would you prefer full-blown class style treating each table like a full object?Language: luafor i= 1, #Enemy do local Cur_Enemy= Enemy[i] if Cur_Enemy.HP_Now > 0 then SomeKindOfCode() end end
does it save the keys/values themselves or just a reference to the object Actor?Language: LuaroomData[currentRoom][2] = Actor
Oh, now that's an interesting page. What's this metatable thing? I'll admit there's a few things I still don't know.
Well, I get the impression you want to do something like this:
Enemy[1].HP_Now
Enemy[6].Attack
This would require another table. In this sense, you can do a for loop to create each thing.
This is sort of what I'm thinking of. Is this the right sort of direction you want? Or would you prefer full-blown class style treating each table like a full object?Creating a copy of a table, as opposed to simply assigning another reference, is a little more involved.
for key, val in pairs(Actor) do
roomData[currentRoom][2].key = val
end
for key, val in pairs(Actor) do
roomData[currentRoom][2].key = val
endNo need for a deep copy here. Just reassign the tables you get. Just make sure you assign the old table to the old variable before you get the new table. We don't need to properly copy every individual element, as input.get keeps spitting out a new table each time, and each table already holds all the information on the keys. However, I'm not entirely familiar with BizHawk's functions. Since I used emu.frameadvance(), the script isn't re-running the code while emulation is paused, so one might want to look over the function list for a better fit.Language: lualocal keys,lastkeys= {},{} local function UpdateKeys() lastkeys= keys keys= input.get() end local function Press(k) return keys[k] and not lastkeys[k] end while true do UpdateKeys() if Press("A") then --Triggered once whenever you press A --Insert generous amounts of code here --Wait, try to keep the code readable... end if keys["J"] then --Triggered repeatedly while holding J --Insert other sorts of code here end emu.frameadvance() end
I'm getting an error because of the line actorMove["Dies"](x). The damage function can't call the dies function. If it's outside of a table, it works fine. Is there a way to make it work in a table? I remember javascript can use expressions such as this.["Dies"]...Language: Lualocal actorMove = { (...) ["Dies"] = function(x) Actor[x].HP = -1 Actor[x].deathframes=100 end, ["Damage"] = function(x,damage,reason) if Actor[x].invulnTime<1 then Actor[x].HP = Actor[x].HP - damage end if Actor[x].HP<0 then actorMove["Dies"](x) Actor[x].deathReason = reason end end, (...) }
Doing it like this might work. Create the table first, then stuff it with the functions, rather than define the functions in the table constructor. As I understand lua variables, a variable defined on the spot can't refer to itself. Having local a= a, for example, will have the script look for a different variable a within scope to put into the local a you're defining right there. In your case, since the table isn't finished being constructed for the local variable you're making, any references to that name isn't looking for that local definition on that spot. It's looking for another actorMove that may have been defined earlier, or even a global one, anything within scope other than itself, essentially. Mostly going off of memory here, but just in case, create a function SelfAware() print(type(actorMove)) end and see what it gives you in your structure, and if you were to try my suggestion.Language: lualocal actorMove= {} actorMove["Dies"]= function(x) -- ... end actorMove["Damage"]= function(x,damage,reason) -- ... end
and it behaves perfectly now!Language: Luaevent.onframestart(function() if Displays[4][2] then -- "tilt" is active doTilt() end end)
