Lua Programming Help Thread

you should download Notepad++
itll connect everything so you know which end to take out, and its very handy

hi i have this error:

Zitat:

---

error: index.lua:30: Argument error: Image:clear([color]) zero or one argument.

---

heres the chunk of code.

Code:

---

if menunum == 1 then
screen.clear()
screen:blit(205, 147, StartOver)
screen:blit(229, 147, Quit)
end

if menunum == 2 then
screen.clear()
screen:blit(229, 147, QuitOver)
screen:blit(205, 147, Start)

---

Zitat:

---

Zitat von hooger

hi i have this error:



heres the chunk of code.

Code:

---

if menunum == 1 then
screen.clear()
screen:blit(205, 147, StartOver)
screen:blit(229, 147, Quit)
end

if menunum == 2 then
screen.clear()
screen:blit(229, 147, QuitOver)
screen:blit(205, 147, Start)

---

---

try "screen:clear()"

clear() is an image function, not a function of the screen (like screen.flip())

Guys please can I have some help?

Currently my chracter walks off the screen. Heres my code:

Code:

---

--Luigi Jump! Map 1
--Author: kozine

--Create colors
green=Color.new(0,255,0)
white = Color.new(255,255,255)

--Load image and draw map
floor = Image.load("images/floor.png")
background = Image.load("images/map1bg.png")
player1 = Image.load("images/luigistand.png")

Music.playFile("sounds/map1.it", true)

--Define Screen Width
screenwidth = 480 - player1:width()
screenheight = 272 - player1:height()

player = {}
player.gravity = 179
player.y = 179
player.x = 10
player.jumpspeed = 172
player.jumpstate = "ground"

--Begin Main Loop
while true do
pad = Controls.read()
screen:clear()


screen:blit(0, 0, background)

screen:blit(0, 208, floor)

if pad:left() then
player.x = player.x - 2
end
if pad:right() then
player.x = player.x + 2
end

if pad:cross() and player.jumpstate == "ground" then player.jumpstate = "jumping" end

if player.jumpstate == "jumping" then
player.jumpspeed = player.jumpspeed - 0.5
player.gravity = player.gravity - player.jumpspeed
end

if player.gravity < 0 then
player.jumpstate = "falling"
end

if player.gravity < 179 and player.jumpstate == "falling" then
player.gravity = player.gravity + (player.jumpspeed + 3)
end

if player.gravity == 179 then
player.jumpspeed = 10
player.jumpstate = "ground"
end

if player.gravity > 179 then player.gravity = 179 end

player.y = player.gravity

screen:blit(player.x, player.y, player1)

screen.flip()
end

---

Can someone edit that so it wont let the chracter off the screen? Cheers!

Zitat:

---

Zitat von c5cha7

???
Heh? It works?
If pad:cross()==false then
something=cool+1 or whatever
end

---

Ok my bad I tought it wouldn't work. I always use my version, besides it looks cleaner :razz: (trying to cover up my mistake :icon_wink )

@kozine:
add this somewhere before the screen.flip():

Code:

---

if player.x<0 then
player.x=0
end

if player.x>480-player1:width() then
player.x=480-player1:width()
end

---

I wrote my first program, it's real simple, but the screen flashes and some of the text doesn't display at all. I think it's got something to do with screen.waitVblankStart() but I'm not sure.

Code:

---

white = Color.new(255,255,255)
red = Color.new(255,0,0)
oldpad = Controls.read()

nickelsnd = Sound.load("game/nickel.wav")
dimesnd = Sound.load("game/dime.wav")
quartersnd = Sound.load("game/quarter.wav")
Music.volume(128)

screen:print(0,0,"Welcome to InvisibleSnake's RedBox",red)
--game loop
while true do
pad = Controls.read()

screen:print(100,100,"Press [] for a nickel",white)
screen.flip()
if pad:square() and oldpad:square() ~= pad:square() then
  nickelsnd:play()
oldpad = pad
end

screen:print(100,150,"Press X for a dime",white)
screen.flip()
if pad:cross() and oldpad:cross() ~= pad:cross() then
  dimesnd:play()
oldpad = pad
end

screen:print(100,200,"Press O for a quarter",white)
screen.flip()
if pad:circle() and oldpad:circle() ~= pad:circle() then
  quartersnd:play()
oldpad = pad
end

screen.waitVblankStart()
screen.flip()
end

---

Zitat:

---

Zitat von Altair

@kozine:
add this somewhere before the screen.flip():

Code:

---

if player.x<0 then
player.x=0
end

if player.x>480-player1:width() then
player.x=480-player1:width()
end

---

---

Thanks! It works :D

Zitat:

---

Zitat von invisiblesnake

I wrote my first program, it's real simple, but the screen flashes and some of the text doesn't display at all. I think it's got something to do with screen.waitVblankStart() but I'm not sure.

Code:

---

white = Color.new(255,255,255)
red = Color.new(255,0,0)
oldpad = Controls.read()

nickelsnd = Sound.load("game/nickel.wav")
dimesnd = Sound.load("game/dime.wav")
quartersnd = Sound.load("game/quarter.wav")
Music.volume(128)

screen:print(0,0,"Welcome to InvisibleSnake's RedBox",red)
--game loop
while true do
pad = Controls.read()

screen:print(100,100,"Press [] for a nickel",white)
screen.flip()
if pad:square() and oldpad:square() ~= pad:square() then
  nickelsnd:play()
oldpad = pad
end

screen:print(100,150,"Press X for a dime",white)
screen.flip()
if pad:cross() and oldpad:cross() ~= pad:cross() then
  dimesnd:play()
oldpad = pad
end

screen:print(100,200,"Press O for a quarter",white)
screen.flip()
if pad:circle() and oldpad:circle() ~= pad:circle() then
  quartersnd:play()
oldpad = pad
end

screen.waitVblankStart()
screen.flip()
end

---

---

try this:

Code:

---

white = Color.new(255,255,255)
red = Color.new(255,0,0)

nickelsnd = Sound.load("game/nickel.wav")
dimesnd = Sound.load("game/dime.wav")
quartersnd = Sound.load("game/quarter.wav")

Music.volume(128)

--game loop
while true do
        pad = Controls.read()
        screen:print(0,0,"Welcome to InvisibleSnake's RedBox",red)
        screen:print(100,100,"Press [] for a nickel",white)
        screen:print(100,150,"Press X for a dime",white)
        screen:print(100,200,"Press O for a quarter",white)

        if pad:square() and pad ~= oldpad then nickelsnd:play() end

        if pad:cross() and pad ~= oldpad then dimesnd:play() end

        if pad:circle() and pad ~= oldpad then quartersnd:play() end

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

---

let me know if it works the way you want it to :D HTH!

works like a charm, califrag, thank you
now it seems a little obvious i should've kept all the screen printing in the loop
thanks again!

Would it be hard to make an image fall from the top of the screen and then start walking around? Also can someone fix this code? Its beaten me. I get this error when trying to move backwards.

error: main.lua:91: bad argument #2 'blit' <Image expected, got nil>

Code:

---

--Luigi Jump! Map 1
--Author: kozine

--Create colors
green=Color.new(0,255,0)
white = Color.new(255,255,255)

x = 10
y = 179

--Load image and draw map
floor = Image.load("images/floor.png")
background = Image.load("images/map1bg.png")
enemy1 = Image.load("images/enemy1.png")
leftlimit = 1
rightlimit = 440
uplimit = 1
downlimit = 230

Music.playFile("sounds/map1.it", true)

player = {}
player[1] = Image.load("luigi/luigi1.png")
player[2] = Image.load("luigi/luigi2.png")
player[3] = Image.load("luigi/luigi3.png")
player[4] = Image.load("luigi/luigi4.png")
player[5] = Image.load("luigi/luigi5.png")
player[6] = Image.load("luigi/luigi6.png")
player[7] = Image.load("luigi/luigi7.png")
player[8] = Image.load("luigi/luigi8.png")
player[9] = Image.load("luigi/luigi9.png")
player[10] = Image.load("luigi/luigi10.png")
playerimg=player[1]

anim = 1
animTimer = 0
animJump = 0
LastDirection = player[1]
Jumping=0

function jump()
if LastDirection==player[1] then playerimg=player[9]
elseif LastDirection==player[5] then playerimg=player[10]
end
animJump=animJump+1
  if animJump>=1 and animJump<=4 then y=y-10
  elseif animJump>=5 and animJump<=8 then y=y+10 end
  if animJump>=9 then animJump=0 Jumping=0 end
end

function walkRight()
LastDirection=player[1]
animTimer=animTimer+1
  if animTimer>=1 and animTimer<=4 then playerimg=player[2]
  elseif animTimer>=5 and animTimer<=8 then playerimg=player[3]
  end
  if animTimer>=9 then animTimer=0 end
end

function walkLeft()
LastDirection=player[5]
animTimer=animTimer+1
  if animTimer>=1 and animTimer<=4 then playerimg=player[6]
  elseif animTimer>=5 and animTimer<=8 then playerimg=player[7]
  end
  if animTimer>=9 then animTimer=0 end
end

--Begin Main Loop
while true do
  pad = Controls.read()
  if pad:right() then walkRight() x=x+3 playerimg=playerimg
  elseif pad:left() then walkLeft() x=x-3 playerimg=player1img
  elseif pad:cross() then Jumping=1
  else playerimg=LastDirection
  end


  if x<=leftlimit then x=leftlimit
  elseif x>=rightlimit then x=rightlimit end
  if y<=uplimit then y=uplimit
  elseif y>=downlimit then y=downlimit end
  if Jumping==1 then jump() end

  if pad:start() then break end


screen:blit(0, 0, background)

screen:blit(0, 208, floor)
screen:blit(x, y, playerimg)

screen.flip()
end

---

Any help is appreaciated!

invisiblesnake, if you want the "welcome..." only in the beginning of the game then put it outside the loop like you had, but put right after it:

Code:

---

screen.waitVblankStart([amount of seconds times 60])

---

So if you want it to show for 3 seconds: screen.waitVblankStart(18 0)

@kozine:
You have this:

Code:

---

--Begin Main Loop
while true do
  pad = Controls.read()
  if pad:right() then walkRight() x=x+3 playerimg=playerimg
  elseif pad:left() then walkLeft() x=x-3 playerimg=player1img

etc.

---

So you are assigning playerimg to playerimg. This doesn't work. Also you already assigned the right pic in the function so you can just delete this.

Altair

So what should I put?

like i said; you can just delete it.
Ok you CAN leave it but its unnecesairy. Why it doesnt work is because the second is wrong. You have player1img instead of playerimg.

Cheers! It works now.

ofcourse :razz:

Ok well, it works on the windows lua player but not on the PSP :S It comes up with the file error!

What is the file error?

NVM. It was my own fault. Forget to include the main.lua file lol!

lol, i always do stuff like that kozine

I will need some help now but I'll post it on Youresam's bmplib post, so plz check that!

Thanks for all the help so far guys :D Next problem, I got the collision code snippet from the Developers Dungeon and have edited all the things that needed to be edited. Now the problem. There is no error or anything. Just that the to things font colide. Here is the code:

Code:

---

--Luigi Jump! Map 1
--Author: kozine

--Create colors
green=Color.new(0,255,0)
white = Color.new(255,255,255)

x = 10
y = 179

w2 = 100
h2 = 22
x2 = 275
y2 = 125
x1 = 10
y1 = 179
w1 = 16
h1 = 35

--Load image and draw map
platform = Image.load("images/platform.png")
floor = Image.load("images/floor.png")
background = Image.load("images/map1bg.png")
pic = Image.load("images/enemy1.png")
picx=400
picy=179
leftlimit = 1
rightlimit = 470
uplimit = 1
downlimit = 230

Music.playFile("sounds/map1.it", true)

player = {}
player[1] = Image.load("luigi/luigi1.png")
player[2] = Image.load("luigi/luigi2.png")
player[3] = Image.load("luigi/luigi3.png")
player[4] = Image.load("luigi/luigi4.png")
player[5] = Image.load("luigi/luigi5.png")
player[6] = Image.load("luigi/luigi6.png")
player[7] = Image.load("luigi/luigi7.png")
player[8] = Image.load("luigi/luigi8.png")
player[9] = Image.load("luigi/luigi9.png")
player[10] = Image.load("luigi/luigi10.png")
playerimg=player[1]

anim = 1
animTimer = 0
animJump = 0
LastDirection = player[1]
Jumping=0

function collision(x1, y1, w1, h1, x2, y2, w2, h2)
if (y2 >= y1 and y1 + h1 >= y2)
or (y2 + h2 >= y1 and y1 + h1 >= y2 + h2)
or (y1 >= y2 and y2 + h2 >= y1)
or (y1 + h1 >= y2 and y2 + h2 >= y1 + h1)
then if x2 >= x1 and x1 + w1 >= x2 then return true
elseif x2 + w2 >= x1 and x1 + w1 >= x2 + w2 then return true
elseif x1 >= x2 and x2 + w2 >= x1 then return true
elseif x1 + w1 >= x2 and x2 + w2 >= x1 + w1
then return true
end
end
return false
end


function jump()
if LastDirection==player[1] then playerimg=player[9]
elseif LastDirection==player[5] then playerimg=player[10]
end
animJump=animJump+1
  if animJump>=1 and animJump<=4 then y=y-30
  elseif animJump>=5 and animJump<=8 then y=y+30 end
  if animJump>=9 then animJump=0 Jumping=0 end
end

function walkRight()
LastDirection=player[1]
animTimer=animTimer+1
  if animTimer>=1 and animTimer<=4 then playerimg=player[2]
  elseif animTimer>=5 and animTimer<=8 then playerimg=player[3]
  end
  if animTimer>=9 then animTimer=0 end
end

function walkLeft()
LastDirection=player[5]
animTimer=animTimer+1
  if animTimer>=1 and animTimer<=4 then playerimg=player[6]
  elseif animTimer>=5 and animTimer<=8 then playerimg=player[7]
  end
  if animTimer>=9 then animTimer=0 end
end

--Begin Main Loop
while true do
  pad = Controls.read()
  if pad:right() then walkRight() x=x+3 playerimg=playerimg
  elseif pad:left() then walkLeft() x=x-3 playerimg=playerimg
  elseif pad:cross() then Jumping=1
  else playerimg=LastDirection
  end


  if x<=leftlimit then x=leftlimit
  elseif x>=rightlimit then x=rightlimit end
  if y<=uplimit then y=uplimit
  elseif y>=downlimit then y=downlimit end
  if Jumping==1 then jump() end

  if pad:start() then break end


screen:blit(0, 0, background)

screen:blit(0, 208, floor)
screen:blit(x, y, playerimg)

screen:blit(picx, picy, pic, 0, 0, pic:width(), pic:height())

if picy+pic:height()<208 then   
picy=picy+10     
end

if picy+pic:height()>208 then
picy=208-pic:height()
end

if picy +pic:height()==208 then
picx=picx-5
end

screen:blit(275, 125, platform)

screen.waitVblankStart()
screen.flip()
end

---

i can't help with that, I have a problem though. this is mainly for youresam to look at:

when i try and use bmp lib in my program it comes up with an error bmplib.lua: the file does not exist, and its in the same folder!!!!!!!!!!
Can anyone help, cheers, Glynnder

Post your code and if you and I are very lucky I may be able to help ;)

ok lol here it is:

Code:

---

-- Lua Picture Converter v 0.01
-- created and designed by Glynnder
-- Please read the readme
-- Copyright Alex Glynn - PSPro
-- This is the bmp to tga converter


dofile("bmplib.lua") --load bmplib

screen:clear()
bmp = Image.bmpload("bmptest.bmp") --return the bmp as an image

screen:clear()
screen:blit(0,0,bmp) --blit the image
screen.flip()

  pad = Controls.read()
               
                if pad:cross() then

                  screen:save("images/convertedimage.tga") 
          end
         
          if pad:start() then
         
        dofile("script.lua")
  end
  if pad:select() then
 
  break
  end

---

I know i need a while true do in there somewhere. also i call this by saying dofile bmptga.lua

I would say you need the dofile("bmplib.lua") in the main loop. Try that. With while true do

i tryed that, it didn't work

lemme try again

yep still goes "BMPLIB: No such file"

Its a pretty noobie question, but i forgot how to get a wav file to loop over and over, can anyone remind me plz?

EDIT: I didnt notice that i had 500 POSTS!!!

Zitat:

---

Zitat von Vaza

Its a pretty noobie question, but i forgot how to get a wav file to loop over and over, can anyone remind me plz?

EDIT: I didnt notice that i had 500 POSTS!!!

---

when you load it up write true in the parenthesis last, like sound=Sound.load("sound.w av", true) then it will keep looping when you play it.

Zitat:

---

Zitat von kozine

Thanks for all the help so far guys :D Next problem, I got the collision code snippet from the Developers Dungeon and have edited all the things that needed to be edited. Now the problem. There is no error or anything. Just that the to things font colide. Here is the code:

Code:

---

--Luigi Jump! Map 1
--Author: kozine

--Create colors
green=Color.new(0,255,0)
white = Color.new(255,255,255)

x = 10
y = 179

w2 = 100
h2 = 22
x2 = 275
y2 = 125
x1 = 10
y1 = 179
w1 = 16
h1 = 35

--Load image and draw map
platform = Image.load("images/platform.png")
floor = Image.load("images/floor.png")
background = Image.load("images/map1bg.png")
pic = Image.load("images/enemy1.png")
picx=400
picy=179
leftlimit = 1
rightlimit = 470
uplimit = 1
downlimit = 230

Music.playFile("sounds/map1.it", true)

player = {}
player[1] = Image.load("luigi/luigi1.png")
player[2] = Image.load("luigi/luigi2.png")
player[3] = Image.load("luigi/luigi3.png")
player[4] = Image.load("luigi/luigi4.png")
player[5] = Image.load("luigi/luigi5.png")
player[6] = Image.load("luigi/luigi6.png")
player[7] = Image.load("luigi/luigi7.png")
player[8] = Image.load("luigi/luigi8.png")
player[9] = Image.load("luigi/luigi9.png")
player[10] = Image.load("luigi/luigi10.png")
playerimg=player[1]

anim = 1
animTimer = 0
animJump = 0
LastDirection = player[1]
Jumping=0

function collision(x1, y1, w1, h1, x2, y2, w2, h2)
if (y2 >= y1 and y1 + h1 >= y2)
or (y2 + h2 >= y1 and y1 + h1 >= y2 + h2)
or (y1 >= y2 and y2 + h2 >= y1)
or (y1 + h1 >= y2 and y2 + h2 >= y1 + h1)
then if x2 >= x1 and x1 + w1 >= x2 then return true
elseif x2 + w2 >= x1 and x1 + w1 >= x2 + w2 then return true
elseif x1 >= x2 and x2 + w2 >= x1 then return true
elseif x1 + w1 >= x2 and x2 + w2 >= x1 + w1
then return true
end
end
return false
end


function jump()
if LastDirection==player[1] then playerimg=player[9]
elseif LastDirection==player[5] then playerimg=player[10]
end
animJump=animJump+1
  if animJump>=1 and animJump<=4 then y=y-30
  elseif animJump>=5 and animJump<=8 then y=y+30 end
  if animJump>=9 then animJump=0 Jumping=0 end
end

function walkRight()
LastDirection=player[1]
animTimer=animTimer+1
  if animTimer>=1 and animTimer<=4 then playerimg=player[2]
  elseif animTimer>=5 and animTimer<=8 then playerimg=player[3]
  end
  if animTimer>=9 then animTimer=0 end
end

function walkLeft()
LastDirection=player[5]
animTimer=animTimer+1
  if animTimer>=1 and animTimer<=4 then playerimg=player[6]
  elseif animTimer>=5 and animTimer<=8 then playerimg=player[7]
  end
  if animTimer>=9 then animTimer=0 end
end

--Begin Main Loop
while true do
  pad = Controls.read()
  if pad:right() then walkRight() x=x+3 playerimg=playerimg
  elseif pad:left() then walkLeft() x=x-3 playerimg=playerimg
  elseif pad:cross() then Jumping=1
  else playerimg=LastDirection
  end


  if x<=leftlimit then x=leftlimit
  elseif x>=rightlimit then x=rightlimit end
  if y<=uplimit then y=uplimit
  elseif y>=downlimit then y=downlimit end
  if Jumping==1 then jump() end

  if pad:start() then break end


screen:blit(0, 0, background)

screen:blit(0, 208, floor)
screen:blit(x, y, playerimg)

screen:blit(picx, picy, pic, 0, 0, pic:width(), pic:height())

if picy+pic:height()<208 then   
picy=picy+10     
end

if picy+pic:height()>208 then
picy=208-pic:height()
end

if picy +pic:height()==208 then
picx=picx-5
end

screen:blit(275, 125, platform)

screen.waitVblankStart()
screen.flip()
end

---

---

Bump :PC: :p

haxor, got any idea's on my problem?

Umm..try this. You don't have a loop, and I definitely think you need one.

Code:

---

-- Lua Picture Converter v 0.01
-- created and designed by Glynnder
-- Please read the readme
-- Copyright Alex Glynn - PSPro
-- This is the bmp to tga converter


dofile("bmplib.lua") --load bmplib

bmp = Image.bmpload("bmptest.bmp") --return the bmp as an image

while true do

screen:clear()
screen:blit(0,0,bmp) --blit the image
screen.flip()

  pad = Controls.read()
               
                if pad:cross() then

                  screen:save("images/convertedimage.tga") 
          end
         
          if pad:start() then
         
        dofile("script.lua")
  end
  if pad:select() then
 
  break
  end
end

---

That should work, all the loaded stuff needs to be before the loop, all the command things need to be inside. If not post the error you get in windows lua and I will be able to help. Cheers on your app. :razz:

Can I have some help on my problem plz!

ok it worked with your code, but obviously loaded the test image, so i switched it to mine and it said must be 24 bit so I'll try converting it, thhanks very much for your help!

Sorry double post, but:

Thanks I converted it and it worked, smhame i g2g to be like now and then im @ skl tomorrow so sadly you'll probably have to wait till either thursday or next week cos if i dont get it done by thursday then we're racing till sunday!
Thanks wvery much and what do u mean cheers on ur app, r u saying it gd if so then THANKS!!!!!!!!!!!
I'll start working now

Zitat:

---

Zitat von Glynnder- PSPro

Sorry double post, but:

Thanks I converted it and it worked, smhame i g2g to be like now and then im @ skl tomorrow so sadly you'll probably have to wait till either thursday or next week cos if i dont get it done by thursday then we're racing till sunday!
Thanks wvery much and what do u mean cheers on ur app, r u saying it gd if so then THANKS!!!!!!!!!!!
I'll start working now

---

Yea, it means good job on working on this app.

cool thanks, I know you will LOVE Codename: app 33, if you like this kind of stuff, it will take ages to release though. I might aim for it to be done on my bday (3rd Sept)

Zitat:

---

Zitat von Vaza

Its a pretty noobie question, but i forgot how to get a wav file to loop over and over, can anyone remind me plz?

EDIT: I didnt notice that i had 500 POSTS!!!

---

anyone?

Zitat:

---

Zitat von Vaza

anyone?

---

Hi Vaza, Friend 2 of 40,000 :D .
I Am here to save the day!

Code:

---

menu = Sound.load("Sounds/Menu.wav", true)
local sound=menu

voice = menu:play()

---

to stop the music it is>

Code:

---

voice:stop()

---

I hope that helps, and its better because
it can actually stop the music from looping when you want it to.