Lua Programming Help Thread

Ok well you use (16*64) then because the x is read according to lua player as a letter the multiplication operator is *.
And do you know what to put where bounce away is? could help u if u dont.

allright.

my last post should help...

Im really gettin angry i'm making my game and there must be such a simple error but i just cant see it. line 12 loop in gettable. Whats wrong ?
white = Color.new(255,255,255)
kitchen = Image.load("kitchen.png")
Player = Image.load("mouse.png")
while true do
pad = Controls.read()
if pad:up() then
Player.y = Player.y + 1
end
if pad:down() then
Player.y = Player.y - 1
end
if pad:right() then
Player.x = Player.x + 1
end
if pad:left() then
Player.x = Player.x - 2
end
screen:clear()
screen:blit(0,0,kitchen)
screen:blit(240,130,Playe r)
screen.waitVblankStart()
screen.flip()
end

Zitat:

---

Zitat von eldiablov

Im really gettin angry i'm making my game and there must be such a simple error but i just cant see it. line 12 loop in gettable. Whats wrong ?
white = Color.new(255,255,255)
kitchen = Image.load("kitchen.png")
Player = Image.load("mouse.png")
while true do
pad = Controls.read()
if pad:up() then
Player.y = Player.y + 1
end
if pad:down() then
Player.y = Player.y - 1
end
if pad:right() then
Player.x = Player.x + 1
end
if pad:left() then
Player.x = Player.x - 2
end
screen:clear()
screen:blit(0,0,kitchen)
screen:blit(240,130,Playe r)
screen.waitVblankStart()
screen.flip()
end

---

you havent defined anything called "Player.x" or "Player.y"

Erm i just thought that it'd know that it's the players co-ordinates ?

you gotta give player.x and player.y values.
edit - nope. you gotta spell it out for luaplayer.

Luaplayer doesn't know ANYTHING except for what to do when you give it a command. You can't go off using undefined variables.

Ive added this in
Player = {}
Player.x = 230
Player.y = 135

then carry on as normal but it still doesnt work. Someone give me some sort of direction

"but it doesn't work"

What error does it give?

I know what's wrong, but you DO need to be more specific in "it doesn't work"

Anyways, you need to define the player's image with a different variable than the x-y table. Also you need to put player.x and player.y inside the table, like this:
Player = { x = blah, y = blah }

Ok thank you ill try it

Zitat:

---

Zitat von eldiablov

It says image expected got table and i define the players image on Player = Image.load("mouse.png") dont i ?

---

after you do player = {}
do: Player.img = Image.load("mouse.png")

then change all the times you use Player to Player.img
--Vaza
-= Double Post =-

Zitat:

---

Zitat von -TacticalPaper-

"but it doesn't work"

What error does it give?

I know what's wrong, but you DO need to be more specific in "it doesn't work"

Anyways, you need to define the player's image with a different variable than the x-y table. Also you need to put player.x and player.y inside the table, like this:
Player = { x = blah, y = blah }

---

you don't HAVE to do that.
you can define like player.x, but its cleaner this way^^
--Vaza

white = Color.new(255,255,255)
kitchen = Image.load("kitchen.png")
Player.img = {x = 240, y = 130}
Player.img = Image.load("mouse.png")
while true do
pad = Controls.read()
if pad:up() then
Player.img.y = Player.y + 1
end
if pad:down() then
Player.img.y = Player.img.y - 1
end
if pad:right() then
Player.img.x = Player.img.x + 1
end
if pad:left() then
Player.img.x = Player.img.x - 2
end
screen:blit(240,130,Playe r.img)
screen:clear()
screen:blit(0,0,kitchen)
screen.waitVblankStart()
screen.flip()
end

ATtempt to index Player a nil value ?

You defined player as a table then you defined it as an image.

Luaplayer thinks player is an image.

You need to use different variables when defining them.

Sorry to go on but could you go further into what you're saying i'm quite new to this

white = Color.new(255,255,255)
kitchen = Image.load("kitchen.png")
Player = {x = 240, y = 130, img = Image.load("mouse.png") }
while true do
pad = Controls.read()
if pad:up() then
Player.y = Player.y - 1
end
if pad:down() then
Player.y = Player.y + 1 -- You had the +/- backwards
end
if pad:right() then
Player.x = Player.x + 1
end
if pad:left() then
Player.x = Player.x - 2
end
screen:clear()
screen:blit(0,0,kitchen)
screen:blit(Player.x,Play er.y,Player.img)
screen.waitVblankStart()
screen.flip()
end
You needed to fix a few different things. There's a script that SHOULD do as intended.

You don't know how much i appreciate that. Thanks very much to all three of you

Okay, I just started LUA yesterday... I made a little sample of an RPG I'm trying to make... I can't seem to get it to work... I attached the file here so you can download it and see it... Also, I need help with adding images underneath the text of the player/enemy. I know how to load/display images, I just can't get them to display properly in the game, it gives me an error when I try... Please try out the sample/demo I made... And please, don't flame me. I'm just looking for help

pspillows, heed my advice, it will help indefinitely. you say you got started with lua yesterday? if thats the extent of your programming history its best not to aim high and try to make an RPG. not gonna happen. sorry, way of the virtual world my friend. see how long i've been a member here? i still dont get alot of the things people do on here, even in lua, my most experienced field. heck, in a second i'm about to post about my problem. i cant say what you should do to further yourself in this, but i can tell you what NOT to do. dont aim high with a crossbow when you need a sniper. look at what other devs do and ask a question here and there after honestly putting effort into it and, before you know it, you'll be doing fine.

EDIT - i need help with reading and writing other files. i'm making a save file, if you will, that tracks progress so the player cant do some of the things that are possible in the beginning. in my game, players will first have to customize their..er..characters (cant really call them characters really, but thats another story) then they set off to play the rest of the game. i'm making a save file so that the result would be something like:

Code:

---

while (player hasnt played before, variable from save file) do
customize character
else
while (player has played before, same variable with different value) do
whatever comes next
end

---

-= Double Post =-
my menu leaves to another script which starts here:

Code:

---

screen:clear(black)
screen.flip()
screen:clear(black)

bg = Image.load("project pics/statsbg.png")

size = 2
speed = 2
recovery = 2

selectstat = 3

save = io.open("save.lua", "r") -- \
first = save:read() ------------- heres whats giving me trouble
save:close() -------------------/

while first== true do

---

the script automatically goes back to the menu after it flickers.

Zitat:

---

Zitat von EminentJonFrost

pspillows, heed my advice, it will help indefinitely. you say you got started with lua yesterday? if thats the extent of your programming history its best not to aim high and try to make an RPG. not gonna happen. sorry, way of the virtual world my friend. see how long i've been a member here? i still dont get alot of the things people do on here, even in lua, my most experienced field. heck, in a second i'm about to post about my problem. i cant say what you should do to further yourself in this, but i can tell you what NOT to do. dont aim high with a crossbow when you need a sniper. look at what other devs do and ask a question here and there after honestly putting effort into it and, before you know it, you'll be doing fine.

EDIT - i need help with reading and writing other files. i'm making a save file, if you will, that tracks progress so the player cant do some of the things that are possible in the beginning. in my game, players will first have to customize their..er..characters (cant really call them characters really, but thats another story) then they set off to play the rest of the game. i'm making a save file so that the result would be something like:

Code:

---

while (player hasnt played before, variable from save file) do
customize character
else
while (player has played before, same variable with different value) do
whatever comes next
end

---

-= Double Post =-
my menu leaves to another script which starts here:

Code:

---

screen:clear(black)
screen.flip()
screen:clear(black)

bg = Image.load("project pics/statsbg.png")

size = 2
speed = 2
recovery = 2

selectstat = 3

save = io.open("save.lua", "r") -- \
first = save:read() ------------- heres whats giving me trouble
save:close() -------------------/

while first== true do

---

the script automatically goes back to the menu after it flickers.

---

Use a different file name, not save. There's probably a function that starts with 'save:'

nope..that didnt do anything...i changed every "save" to "profile". oh, if you were wondering, 'save.lua' file only has the word 'true' in it. thats it.

Maybe it should be:

while first == "true" do

Try adding the quotes.

didnt work either...:(

i even added these: "" to the save file text...still nothing.

could it be luaplayer? i have cool's mod.

I don't think so. Cools mod is the same thing, only with a few more functions. Could you post your whole code?

this is all the code that has anything to do with the problem. without these codes, it runs fine, but not how i want it to.

main script -

Code:

---

profile = io.open("save.lua", "r")
first = profile:read()
profile:close()

-- skipping some code

while first == "true" do
-- skipping alot of code
end

---

Save File -

Code:

---

"true" -- player's first time playing

---

Zitat:

---

Zitat von EminentJonFrost

this is all the code that has anything to do with the problem. without these codes, it runs fine, but not how i want it to.

main script -

Code:

---

profile = io.open("save.lua", "r")
first = profile:read()
profile:close()

-- skipping some code

while first == "true" do
-- skipping alot of code
end

---

Save File -

Code:

---

"true" -- player's first time playing

---

---

Maybe instead of writing true, write 0 for false and 1 for true. Numbers might be easier to work with.

nope. :(...
i'm gonna have to find some way around this then...

if anyone thinks they know whats wrong though, please tell me.

did you try adding

Code:

---

first = "true"

---

to the savefile?

this, translated, pretty much means that.

Code:

---

first = profile:read()

---

i know but you may have to define it in the savefile then just us do:file(filename)

hmm...i'll try that :)
so simple, it just might work.

Zitat:

---

Zitat von slicer4ever

i know but you may have to define it in the savefile then just us do:file(filename)

---

taht wont work.
-= Double Post =-

Zitat:

---

Zitat von EminentJonFrost

this is all the code that has anything to do with the problem. without these codes, it runs fine, but not how i want it to.

main script -

Code:

---

profile = io.open("save.lua", "r")
first = profile:read()
profile:close()

-- skipping some code

while first == "true" do
-- skipping alot of code
end

---

Save File -

Code:

---

"true" -- player's first time playing

---

---

try this:

main script -

Code:

---

profile = io.open("save.lua", "r")
first = profile:read()
profile:close()

-- skipping some code

if first == "true" then
-- skipping alot of code
end

---

Grimfate - that didnt work...errors started coming up about how many 'ends' there were

slicer4ever - i did that, sorta. and it worked!

i did this:

Code:

---

dofile("./save file.lua")

while first == true do

...
if button pressed
save = io.open("save file.lua", "w")
save:write("first = false")
save:close()
end
...
end

---

worked like a charm! :)
successful bypass gentlemen! lol
thanks Access_Denied, Grimfate, and slicer4ever! :Punk:

Zitat:

---

Zitat von EminentJonFrost

Grimfate - that didnt work...errors started coming up about how many 'ends' there were

slicer4ever - i did that, sorta. and it worked!

i did this:

Code:

---

dofile("./save file.lua")

while first == true do

...
if button pressed
save = io.open("save file.lua", "w")
save:write("first = false")
save:close()
end
...
end

---

worked like a charm! :)
successful bypass gentlemen! lol
thanks Access_Denied, Grimfate, and slicer4ever! :Punk:

---

tight, i don't know why nobody could get it to work, but this is a great bypass! nice ideas!!!

I need help with my ping pong game, once more...

Zitat:

---

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

screen:print(136, 136, "Loading LUA Pong...", white)
screen.flip()

background = Image.load("Background.pn g")

bat11 = Image.load("Bat1.png")

bat21 = Image.load("Bat2.png")

bat1 = { x = 20, y = 100 }
bat2 = { x = 460, y = 100 }

ball = { x = 240, y = 146, image = Image.load("Ball.png") }

screen.waitVblankStart(60 )

while true do

screen:clear()
screen:blit(bat1.x, bat1.y, bat11, true)
screen:blit(bat2.x, bat2.y, bat21, true)

pad = Controls.read()

if ball.x == bat.x and ball.y >= bat.y and ball.x < (16*64) then
bounce away
end

if pad:down() then
bat1.y = bat1.y +2
end

if pad:up() then
bat1.y = bat1.y -2
end

if pad:cross() then
bat2.y = bat2.y +2
end

if pad:triangle() then
bat2.y = bat2.y -2
end

if pad:start() then
break
end

screen:print(136, 136, "Welcome to the world of PPP.", white)
screen.waitVblankStart()
screen.flip()
end

---

What i need is, the variable for "bounce away" because i dont know what to write there.

Setup a direction system for the ball and make collisions change its directio. then do if direction == blah then ballx = ballx-1 or whatever

Sry Tactical, to be honest, i didn't understand a (beep) of what you said.
Im a total n00b to lua...

Allright I hava a problem,
1st time in this thread so don't pLh4M3 me :tup:

When I run this code:

Spoiler for Code:

Code:

---

--Load's
menu = Image.load("data/menu.png")
credits = Image.load("data/credits.png")
load = Image.load("data/loading_screen.png")

--Colors
purple = Color.new(255,255,255)
red = Color.new(255,0,0)

current = 1 --this is our current menu selection
oldpad = Controls.read()
while true do
pad = Controls.read()
screen:clear()
-- Prints our 5 menu options
screen:print(23,62,"Start Sword Fight",purple)
screen:print(23,86,"Go to options",purple)
screen:print(23,110,"High Scores",purple)
screen:print(23,134,"Cheats (not implented)",purple)
screen:print(23,156,"Exit to XMB",purple)
-- These make it so when the variable "current" changes
-- so does the current menu selection

screen:blit(0,0,menu)

if current == 1 then
screen:print(28,67,"Start Sword Fight",red)
end
if current == 2 then
screen:print(28,91,"Go to options",red)
end
if current == 3 then
screen:print(28,116,"High Scores",red)
end
if current == 4 then
screen:print(28,139,"Show credits screen",red)

screen:blit(0,0,credits)
screen.waitVblankStart()
if pad:down() then
dofile("./index.lua")
end
if current == 5 then
screen:print(28,163,"Exit to XMB",red)
end
-- Makes it so when UP/DOWN is pressed, the variable
-- "current" changes making the selection change
if pad:up() and oldpad:up() ~= pad:up() then
current = current - 1
end
if pad:down() and oldpad:down() ~= pad:down() then
current = current + 1
end
--Makes it so the selection goes from the bottom to top
if current == 6 then
current = 1
end
if current == 0 then
current = 5
end
screen.waitVblankStart()
screen.flip()
oldpad = pad
end

---

Lowser will just do nothing,
It loads something for about 2 seconds,
and then it doesn't do anything!
I can still use home and such...

Can someone help me?!?




btw: does anyone know where to download that luaplayer for windows that displays the error code, instead of just shutting off?
I know it exists......

:tup:

Zitat:

---

Zitat von gameo

I need help with my ping pong game, once more...



What i need is, the variable for "bounce away" because i dont know what to write there.

---

on bounce away this is what i would do. I would assign a variable at the beginning of ur code outside of the main loop.... u know what let me just rewrite your code

Spoiler for Your code:

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

screenrint(136, 136, "Loading LUA Pong...", white)
screen.flip()

background = Image.load("Background.pn g")

bat11 = Image.load("Bat1.png")

bat21 = Image.load("Bat2.png")

bat1 = { x = 20, y = 100 }
bat2 = { x = 460, y = 100 }

ball = { x = 240, y = 146, image = Image.load("Ball.png") }

screen.waitVblankStart(60 )

--assigning this to make ur ball move HAHAHAHA that was funny anyways
ballmoving = nil

while true do

screen:clear()
screen:blit(bat1.x, bat1.y, bat11, true)
screen:blit(bat2.x, bat2.y, bat21, true)

pad = Controls.read()

--theres collision for bat1 now for bat 2
if ball.x == bat1.x and ball.y >= bat1.y and ball.x < (16*64) then
ballmoving = "true"
end

--theres paddle 2's collision
if ball.x == bat2.x and ball.y >= bat2.y and ball.x < (16*64) then
ballmoving = "false"
end

--now what happens if ballmoving = true????
--what operater do i use??? = or ===?? o well ill use ==
if ballmoving == "true" then
ball.x = ball.x + 2
end

--now if its going the other way
if ballmoving == "false" then
ball.x = ball.x - 2
end

if pad:down() then
bat1.y = bat1.y +2
end

if pad:up() then
bat1.y = bat1.y -2
end

if pad:cross() then
bat2.y = bat2.y +2
end

if pad:triangle() then
bat2.y = bat2.y -2
end

if pad:start() then
break
end

screenrint(136, 136, "Welcome to the world of PPP.", white)
screen.waitVblankStart()
screen.flip()
end

Right off the top if any other coders find problems tell me. or just fix it

Zitat:

---

Zitat von gameo

I need help with my ping pong game, once more...



What i need is, the variable for "bounce away" because i dont know what to write there.

---

well, you cant just magically call a function called "bounceBall". set-up a physics system. ill get you started:

Code:

---

ball = {x = 50, y = 50, img = Image.load("ball.png"), xMove = 3, yMove = 3 }

---

then..

Code:

---

ball.x = ball.x + ball.xMove
ball.y = ball.y + ball.yMove

if (ball hits paddle) then
ball.xMove = (something else)
ball.yMove = (something else)
end

---