Lua Programming Help Thread

[EminentJonFrost]

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.

[Access_Denied]

Maybe it should be:

while first == "true" do

Try adding the quotes.

[EminentJonFrost]

didnt work either...

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

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

[Access_Denied]

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

[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 -

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 -

"true" -- player's first time playing

[Access_Denied]

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 -

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 -

"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.

[EminentJonFrost]

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

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

[slicer4ever]

did you try adding

first = "true"

to the savefile?

[EminentJonFrost]

this, translated, pretty much means that.

first = profile:read()

[slicer4ever]

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

[EminentJonFrost]

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

[Grimfate126]

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

taht wont work.
-= Double Post =-

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 -

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 -

"true" -- player's first time playing

try this:

main script -

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

-- skipping some code

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

[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:

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:

[emericaska8r]

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:

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!!!

[gameo]

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

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 )

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

screenrint(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.

[TacticalPenguin]

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

[gameo]

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

[Savagefreak]

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

When I run this code:

Spoiler for 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......

[GuitarGod1134]

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

[Grimfate126]

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:

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

then..

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

[slicer4ever]

@frost np anytime
@game you need to set up a direction system where it well move the ball based on it's current direction just make a simple variable called direction then based on the way the ball hits adjust the direction and so on and so forth

[TacticalPenguin]

"@game you need to set up a direction system where it well move the ball based on it's current direction just make a simple variable called direction then based on the way the ball hits adjust the direction and so on and so forth
"

Issn't that exactly what I said? Anyways, by direction system I mean this:

Add a variable called "d"or "direction" to the table for the ball. However, since the ball will be moving diagonally, you need to use two variables. For this ill use d1 and d2. The number on the endof the direction indicates how fast the ball should go when it is going that direction.
Then to make the ball move do something like:
if ball.d == u1 and ball.y > 0 then
ball.y = ball.y - 1
elseif ball.d == u2 and ball.y > 0 then
ball.y = ball.y - 2
end

And then do that for however many you want each direction. The ball will move differently depending on what and how high its two directions are. Then for changing the ball's directions, make some formulas and then do something like
if collision then ball.d1 = something ball.d2 = something end

The something in there can be determined by a ricochet formula which I'll leave youto figure out.

[EminentJonFrost]

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

When I run this code:

Spoiler for 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......

whats the name of the file of that script. it should be "index.lua". if thats not the problem then come back.

oh, to have luaplayer for windows display the error you have to do this:

right-click the "test" file. its a "Windows NT Command Script". (hover the mouse over the file to see it)

Edit it.

it should open and say "luaplayer index.lua"

just go down one line (hit enter) and type "pause". then save. done!

[Grimfate126]

"@game you need to set up a direction system where it well move the ball based on it's current direction just make a simple variable called direction then based on the way the ball hits adjust the direction and so on and so forth
"

Issn't that exactly what I said? Anyways, by direction system I mean this:

Add a variable called "d"or "direction" to the table for the ball. However, since the ball will be moving diagonally, you need to use two variables. For this ill use d1 and d2. The number on the endof the direction indicates how fast the ball should go when it is going that direction.
Then to make the ball move do something like:
if ball.d == u1 and ball.y > 0 then
ball.y = ball.y - 1
elseif ball.d == u2 and ball.y > 0 then
ball.y = ball.y - 2
end

And then do that for however many you want each direction. The ball will move differently depending on what and how high its two directions are. Then for changing the ball's directions, make some formulas and then do something like
if collision then ball.d1 = something ball.d2 = something end

The something in there can be determined by a ricochet formula which I'll leave youto figure out.

its not called that but here is the basic formula:

when you have a rounded object, that hits against a flat surface, your incoming angle is that angle between an imaginary perpendicular (which is drawn straight up from the point of collision), and the path of the object. your path of "reflection" (im using wave terminology) is equal to the incoming angle. a picture to help:




so basically, you will have to use trig (sin and cos) to have a perfectly simulated game. but, no one cares that much, thankfully.

[emericaska8r]

i made my own simple pong game, and i just had two variables for the x and y values of the ball's slope, and another variable for the speed.

when the ball collides, just think about where it is going next, and it is easy to figure out what the new slope must be

[Yongobongo]

Anyone know whats wrong with this?

if (housex + house:width() > packx) and (housex < packx + pack:width()) and (housey + house:height() > packy) and (housey < packy + pack:width()) then
score = score + 1
end

[Access_Denied]

Anyone know whats wrong with this?

I don't see anything wrong, but sometimes I miss things. If I were you, I would use the evilmana tutorilas. It teaches you how to make a function, so you don't need to write dozens of if statements.

[TacticalPenguin]

Its probably because hes using housex when it should be house.x and house.img:width()

[GuitarGod1134]

how would u make a racing game in lua? im confused on how.... want to make one after playing some racing games i was inspired lol. you would need like speed variable and acceleration but im not quite sure how to make it can someone give a quick example.

[myschoo]

u mean 3d racing game like wedge racer??