Lua Programming Help Thread

[Zeemon]

Hey-- I recently started learning lua...have never even worked with Luaplayer before though.. So I got a quick (idiotic) question..Which will soon be followed by more..

What is Lowser?

[Spirit]

Hold up, is the v in VarPlayerrage supposed to be in capital? beacuse the next one is not.

Wow. I am an idiot. Thanks for your help. :)

[Grimfate126]

Hey-- I recently started learning lua...have never even worked with Luaplayer before though.. So I got a quick (idiotic) question..Which will soon be followed by more..

What is Lowser?

lowser is like the XMB for lua. when you start up LUA, the list of games/folders you see as a whole is called lowser.

[Zeemon]

Ahh-- that's what I thought..But I wasn't sure, and somehow couldn't find much info.

Thank!

[ZereoX]

IS there a Again function like
Ex:
if pad:cross() then
screen:blit(0,0,Backgroun d)
if pad:cross again then
screen:blit(0,0,Backgroun dtwo)
is that possible and if yes do he have to make the function or it exist already?

[hb-man]

hey......i just started makeing my First game in LUA

I NEED HELP...

i need a tutorial or somthing to learn:

HOW TO MAKE A ramdom miser and MATCHER

EXAMPLE:
say i make a random dice roll and i get a 5 then i want to be able to click on the number 5 on a number chart and then if right it will keep going and if wronge it will start over and keep ur highscore..

HOW Could i DO this

P.S HELP PLEASE THANKS

[ZereoX]

For tutorial go to:
Evilmana.com
You mean a random function?

[Grimfate126]

IS there a Again function like
Ex:
if pad:cross() then
screen:blit(0,0,Backgroun d)
if pad:cross again then
screen:blit(0,0,Backgroun dtwo)
is that possible and if yes do he have to make the function or it exist already?

no, there isnt a again function, but you could do this:

1. add all your backgrounds to an array:

backgrounds = {}

backgrounds[1] = Image.load("background1.png")
backgrounds[2] = Image.load("background2.png")
... and so on for all backgrounds.

2. then add this:

currentbackground = 0

3. now, your code:

if pad:cross() then
currentbackground = currentbackground + 1
screen:blit(0,0,backgrounds[currentbackground])
end

try that.

[Zeemon]

I'm having some trouble installing lower v0.12 on Luaplayer v.16. Could someone tell me how?

Thanks

[ZereoX]

it whas an EXAMPLE my real problem is that i can't add a third card to my table
whitout making it it appear when i press hit first time making the second card appears the third one appers for 2 second andthen dissapear when i press hit agin it appear then dissapear i have to hold it down how can i do so that when i press hit only the second card appears and when i press hit again only the third card appears and stay.
here is a part of my code:

if pad:cross() and Command == 1 then
Select:play() Drawcard = 1
end

if Drawcard == 1 then
drawCard() Points = Points + Pointstwo
end

[qwerty]

ok guys im making my first game ever, and it will be released as a beta as soon as this bug is fixed. ok so in the game, when you start it theres a menu. it says press x to begin. but you need to hold x the whole time while playing then game. so thats the problem. also theres a shop that does the same thing, you have to hold square the whole time. and also when you go to begin level 1, it just flashes the screen for a split second and then goes away. plz help

[ZereoX]

Post your code il look at it.

[qwerty]

green = Color.new(0,255,0)
red = Color.new(255,0,0)
blue = Color.new(0,0,255)
white = Color.new(255,255,255)
inpaintshop = Image.load("inpaintshop.p ng")
player = Image.load("player.png")
menu = Image.load("menu.png")
inpaintshop = Image.load("inpaintshop.p ng")
playern2o = Image.load("playern2o.png ")
roadlevel1 = Image.load("roadlevel1.pn g")
road = Image.load("road.png")
upcurb = Image.load("uppercurb.png ")
inshop = Image.load("inshop.png")
lowcurb = Image.load("lowercurb.png ")
trash = Image.load("trash.png")
firstgas = Image.load("1stgasstation .png")
cash = {}
cash.money = 200
mid = Image.load("middle.png")
playerorange = Image.load("playerorange. png")
playerred = Image.load("playerred.png ")
playerredn2o = Image.load("playerredn2o. png")
playerorangen2o = Image.load("playerorangen 2o.png")
selectingdiff = { hl = Image.createEmpty(145,15) , x = 114,y = 33 }
selectingdiff.hl:clear(wh ite)
timer = Timer.new()
time = timer:time()
nitros = {}
nitros.y = 15
health = {}
health.y = 15
screenwidth = 480 - player:width()
screenheight = 272 - player:width()
Player = { }
Player[1] = { x = 216, y = 197 }
Player.nitros = 50
Player.health = 50
screen.flip()
gamestate = { w = "game"}


while true do
pad = Controls.read()
-- menu
gamestate.w = "menu"
screen:blit(0,0,menu,fals e)
screenrint(100,150,"Press 'X' to play",red)
screenrint(100,160,"Press 'O' to quit",red)
if pad:cross() and gamestate.w == "menu" then
gamestate.w = "game"

pad = Controls.read()
oldpad = Controls.read()
screen:clear()
screen:blit(0,0,firstgas, false)
screen:fillRect(15,15,Pla yer.nitros,nitros.y,blue)
screen:fillRect(72,15,Pla yer.health,health.y,red)
screen:blit(Player[1].x,Player[1].y,player)
screenrint(250,10,"Player.x: " .. Player[1].x,red)
screenrint(250,20,"Player.y: " .. Player[1].y,red)
screenrint(15,37,"n2o: " .. Player.nitros,blue)
screenrint(72,37,"HP: " .. Player.health,red)
screenrint(123,37,"Cash: " .. cash.money,green)

if pad:left() and Player[1].x > 0 then
Player[1].x = Player[1].x - 4
end

if pad:right() and Player[1].x < screenwidth then
Player[1].x = Player[1].x + 4
end

if pad:up() and Player[1].y > 0 then
Player[1].y = Player[1].y - 4
end

if pad:down() and Player[1].y < screenheight then
Player[1].y = Player[1].y + 4
end

if pad:r() then
screen:blit(Player[1].x,Player[1].y,playern2o)
end

if pad:r() and pad:right() and Player[1].x < screenwidth then
Player[1].x = Player[1].x + 10
end

if pad:r() and pad:left() and Player[1].x > 0 then
Player[1].x = Player[1].x - 10
end

if pad:r() and pad:up() and Player[1].y > 0 then
Player[1].y = Player[1].y - 10
end

if pad:r() and pad:down() and Player[1].y < screenheight then
Player[1].y = Player[1].y + 10
end

if pad:r() and Player.nitros > 0 then
Player.nitros = Player.nitros - 1
end

if Player.health == 0 then
screen:clear()
screenrint(25,200,"You ran out of Health, game over. Press Start to Exit", red)
end

if Player.health > 50 then
Player.health = 50
end

if Player[1].x <= 272 and Player[1].y <= 57 then
screenrint(100,200, "Press 'X' to fill up on HP and n2o.", red)
end

if pad:cross() and Player[1].x <= 472 and Player[1].y <= 41 then
Player.health = Player.health + 20
end

if pad:cross() and Player[1].x <= 472 and Player[1].y <= 41 then
Player.nitros = Player.nitros + 20
end

if Player.nitros > 50 then
Player.nitros = 50
end

if Player.health < 10 then
screenrint(240,265,"In risk losing your honor and dieing at the same time!",red)
end

if Player[1].x <= 44 and Player[1].y >= 141 then
screenrint(100,200,"Press 'O' to begin Level 1", red)
end

if Player[1].x >= 348 and Player[1].y <= 57 then
screenrint(100,200,"Press '[_]' to shop", red)
end
-- fix nitros bug
if Player.nitros == 0 and pad:r() and pad:left() and Player[1].x > 0 then
Player[1].x = Player[1].x + 6
screen:blit(Player[1].x,Player[1].y,player)
end

if Player.nitros == 0 and pad:r() and pad:right() and Player[1].x < screenwidth then
Player[1].x = Player[1].x - 6
screen:blit(Player[1].x,Player[1].y,player)
end

if Player.nitros == 0 and pad:down() and pad:r() and Player[1].y < screenheight then
Player[1].y = Player[1].y - 6
screen:blit(Player[1].x,Player[1].y,player)
end

if Player.nitros == 0 and pad:up() and pad:r() and Player[1].y > 0 then
Player[1].y = Player[1].y + 6
screen:blit(Player[1].x,Player[1].y,player)
end

if pad:square() and Player[1].x >= 348 and Player[1].y <= 57 then
gamestate.w = "inshop"
screen:clear()
screen:blit(0,0,inshop,fa lse)
screenrint(114,33,"How may I help you today?",red)
screenrint(114,53,"Press 'X' for Health Items",red)
screenrint(114,63,"Press 'O' for Nitros Items",blue)
screenrint(114,73,"Press '[]' for Car Paint and Tuning",green)
end
if pad:square() and gamestate.w == "inshop" then
gamestate.w = "inpaintshop"
screen:clear()
screen:blit(0,0,inpaintsh op,false)
end
if pad:square() and gamestate.w == "inpaintshop" and cash.money >= 100 then
gamestate.w = "playerred"
cash.money = cash.money - 100
screen:blit(Player[1].x,Player[1].y,playerred)
if pad:r() and pad:left() and gamestate.w == "playerred" and Player[1].x > 0 then
Player[1].x = Player[1].x - 10
end
if pad:r() and pad:right() and gamestate.w == "playerred" and Player[1].x < screenwidth then
Player[1].x = Player[1].x + 10
end
if pad:r() and pad:down() and gamestate.w == "playerred" and Player[1].y < screenheight then
Player[1].y = Player[1].y + 10
end
if pad:r() and pad:up() and gamestate.w == "playerred" and Player[1].y > 0 then
Player[1].y = Player[1].y - 10
end
else
if pad:square() and gamestate.w == "inpaintshop" and cash.money < 100 then
screen:clear(blue)
screenrint(100,150,"Not enough cash",red)
screen.waitVblankStart(12 0)
gamestate.w = "game"
end
end
if pad:circle() and Player[1].x <= 44 and Player[1].y >= 149 then
gamestate.w = "level1"
screen:clear(blue)
Player[1].x = 898 -- this is messed up
Player[1].y = 900 -- this to
screenrint(100,200,"Remember to drive safely, you don't want to die!! Press 'X' to begin",red)

end
end
if gamestate.w == "menu" and pad:circle() then
break end

screen.flip()
screen.waitVblankStart()
end

[ZereoX]

you have to do somthing like this

if pad:cross() and gamestate.w == "menu" then
gamestate.w = "game"
end

If gamestate.w == "game" then
EXstartgame)
end

other EX:

if pad:cross() anf Mainmenu == Menu then
Mainmenu = game
end

if Mainmenu == game the
(start the game)
end

[Wacko`]

I'm currently exploring the LUA world, and I was wondering if there is a command/a way to jump to certain bits of code in your program?

[qwerty]

that didnt work...

[ZereoX]

try removing your code from " like

gamestate.w = "game"

gamestate.w = game cause whn its in " its like typing a word

[qwerty]

that didnt work either... should i have the menu code outside the main loop, all by it self, or in another seperate loop then the game loop?

[ZereoX]

actualy in my game my menu is on a other .lua file i just youse the command:

if pad:cross() and menustatus == 0 then
Select: play() dofile("game.lua")
end

My menu code:

-- Colors
white = Color.new(255, 255, 255)
red = Color.new(255, 0, 0)
-- Image load
Title = Image.load("images/TitleScreen.png")
Selector = Image.load("images/Selector.png")
Select = Sound.load("sounds/Select.wav",false)

--Variable
menustatus = 0
Music.volume(128)
while true do

pad = Controls.read()

screen:blit(0,0,Title)

screen:print(225, 110, "START", white)
screen:print(225, 120, "CREDITS", white)
screen:print(225, 130, "EXIT", white)

if pad:up() and oldpad:up() ~= pad:up() then
menustatus = menustatus-1
end

if pad:down() and oldpad:down() ~= pad:down() then 
menustatus = menustatus+1
end

if menustatus > 2 then
menustatus = 0
end

if menustatus < 0 then
menustatus = 2
end

if menustatus == 0  then
screen:print(225, 110, "START", red) screen:blit(200,110,Selector)
else
if menustatus == 1  then
screen:print(225, 120, "CREDITS", red) screen:blit(200,120,Selector)
else
if menustatus == 2  then
screen:print(225, 130, "EXIT", red) screen:blit(200,130,Selector)
end
end
end

if pad:cross() and menustatus == 0 then
Select:play() dofile("game.lua")
end

if pad:cross() and menustatus == 1 then
Select:play() dofile("credits.lua")
end

if pad:cross() and menustatus == 2 then
Select:play() 
break
end
end

screen.waitVblankStart()
screen.flip()
oldpad = pad
end

IM not the best so you shounld aks Grimfate126 or Sousanator or somone else.

[EminentJonFrost]

I'm currently exploring the LUA world, and I was wondering if there is a command/a way to jump to certain bits of code in your program?

eh?
by the way you ask your question, i can tell you need to learn a little more..

jump to certain bits of your code..

well, there are these commands called "Functions". Functions are basically user-created codes.

Like say you want some photos to show in a slide show-esque manner when you press a button. You make a function that does that.

function slide_show() -- Note: there cannot be a space in the function name. hence, "slide_show" instead of "slide show".
screen:blit(x, y, photo1)
screen.flip() 
screen.waitVblankStart(10)
screen:blit(x, y, photo2)
screen.flip() 
screen.waitVblankStart(10)
screen:blit(x, y, photo3)
screen.flip() 
screen.waitVblankStart(10)
end

That answer your question?

[Altair]

I'm currently exploring the LUA world, and I was wondering if there is a command/a way to jump to certain bits of code in your program?

Nope there aren't any "label" and "goto" commands. I was looking for those too at first, but you'll have to do with functions. Works just as good.

[EminentJonFrost]

Nope there aren't any "label" and "goto" commands. I was looking for those too at first, but you'll have to do with functions. Works just as good.

hmm...I'm the one that needs to learn more.

[agashka]

ok, back from my lua coding, here a problem, ive been using io.open to wright settings, but the problem , is that it overwright all the file.So i added the rest of the code to the wright process , but there no Enters... only 1 line and another thing is on that setting file i got a line:
curentcar = "car/driver.txt"
well... guess what:

file:write("curcar = "car/driver.txt"")

i cant put that!

what shall i do?

[EminentJonFrost]

ok, back from my lua coding, here a problem, ive been using io.open to wright settings, but the problem , is that it overwright all the file.So i added the rest of the code to the wright process , but there no Enters... only 1 line and another thing is on that setting file i got a line:
curentcar = "car/driver.txt"
well... guess what:

file:write("curcar = "car/driver.txt"")

i cant put that!

what shall i do?

i cant help you there...your ahead of me now. Writing and reading files. I'm learning that myself.

[agashka]

thats what i tried but well... i thing im gonna see my bookmark and seach for something usefull

[montrob]

ok, back from my lua coding, here a problem, ive been using io.open to wright settings, but the problem , is that it overwright all the file.So i added the rest of the code to the wright process , but there no Enters... only 1 line and another thing is on that setting file i got a line:
curentcar = "car/driver.txt"
well... guess what:

file:write("curcar = "car/driver.txt"")

i cant put that!

what shall i do?

ok heres what you do

Pay attention to the bold print

//to overwrite the whole file//
file = io.open("yourfile.txt", "w")
file:write("yourtext")
file:close()

//to add to the file//
file = io.open("yourfile.txt", "a")
file:write("yourtext")
file:close()

// to read a file//
file = io.open("yourfile.txt", "r")
file:read()
file:close()

there are more functions like that.. visit www.evilmana.com for more tuts on that kind of stuff

[TheMarioKarters]

ok heres what you do

Pay attention to the bold print

//to overwrite the whole file//
file = io.open("yourfile.txt", "w")
file:write("yourtext")
file:close()

//to add to the file//
file = io.open("yourfile.txt", "a")
file:write("yourtext")
file:close()

// to read a file//
file = io.open("yourfile.txt", "r")
file:read()
file:close()

there are more functions like that.. visit www.evilmana.com for more tuts on that kind of stuff

Ahh, that's pretty neat. Thanks for that. :)

[montrob]

Ahh, that's pretty neat. Thanks for that. :)

welcome..

[PSPduh]

How would you print a variable to a file? Is it that you have to concentrate it with the ..? Because if i were ever to make a game and want to have highscore, I would write it to another file. Example, if i have a gmae and it has a highscore, I want to write that to another file. How would I do that? (I know i asked the same question 20 times....)

[montrob]

How would you print a variable to a file? Is it that you have to concentrate it with the ..? Because if i were ever to make a game and want to have highscore, I would write it to another file. Example, if i have a gmae and it has a highscore, I want to write that to another file. How would I do that? (I know i asked the same question 20 times....)

just a basic way of doing it

-- code here

file = io.open("yourfile.txt", "w")
if currentscore >= hiscore then
file:write("currentscore")
file:close()