Lua Programming Help Thread

[mark.sparky]

ive edited my post to include the lua files
-= Double Post =-
hey ive just edited my code and now when you go outside no matter where you start you end up in the middle of the screen but when you go inside you start at the entrance instead of the center. Can someone please help me because this is confusing

[GuitarGod1134]

okay im getting an error when i run this something like
index.lua 16 expected near ')' the usual well heres the code

--//maze of doom
--loads the map
grass = Image.load("grass.png")
--loads the player and enemies
player = Image.load("player.png")
enemy1 = Image.load("enemy1.png")
enemy2 = Image.load("enemy2.png")
--screen width and height
screenwidth = 480 - player:width()
screenheight = 272 - player:width()
--player table
Player = {}
Player[1]= {x=0, y=0}
-- enemy table
enemy = {}
enemy[1]= {x=10, y=10)
--first loop
while true do
pad = Controls.read()
for a = 0, 14 do
for b = 0, 8 do
screen:blit (32*a, 32*b, grass)
end
end
-- print the player to the screen
screen:blit(Player[1].x,Player[1].y,player)
-- now lets make him move
if pad:left() and Player[1].x > 0 then
Player[1].x = Player[1].x - 3
end
if pad:right() and Player[1].x < screenwidth then
Player[1].x = Player[1].x + 3
end

if pad:up() and Player[1].y > 0 then
Player[1].y = Player[1].y - 3
end

if pad:down() and Player[1].y < screenheight then
Player[1].y = Player[1].y + 3
end
--x=width and y= height
-- this prints the enemy1 to screen
screen:blit(enemy[1].x,enemy[1].y,enemy1)
-- now lets try to get him patrolling
Direction = { x = 0, y = 0 }
Direction.x = 1
enemy[1].x = 10
enemy[1].y = 10

Speed = 3

while true do
if enemy[1].x < 10 then
Direction.x = 1
end

if enemy[1].x > 200 then
Direction.x = -1
end

enemy[1].x = enemy[1].x + ( Speed * Direction.x )
enemy[1].y = enemy[1].y + ( Speed * Direction.y )

end

screen.waitVblankStart()
screen.flip()
end

Also my patrolling code im still having trouble understanding it but if it looks right then can i just get an ok on it. thanks.

[mark.sparky]

on line sixteen in the array( i think that is what it is called ) you have a { and finish with a )

[GuitarGod1134]

alright i was really bored today as i was waiting for the feedback on my maze thing so i coded a simple rock paper scissors game. i havent tested it yet so can someone just proof read my source really fast and i would appreciate you not taking it because after working on this for a couple more days i may release it.

--removed the code because of the problem being fixed.

Smileyface with tongue sticking out == : p (take away the spaces)
EDIT: O didnt even see your posts mark.sparky thanks for the correction. once im done with rock paper and scissors ill test it again.
EDIT AGAIN: i tried this game and im getting an error 28 or something like that. it says i have like an unknown symbol or something cant really figure it out help plz.

[myschoo]

error:28: unexpected symbol near "and"

[GuitarGod1134]

yah thats the error but whats the fix?

[Access_Denied]

In this line:

if pad:circle() then
screen:blit(390, 20, rock) and player2 = player2 + 3
end

You don't put and, you do this:

if pad:circle() then
screen:blit(390, 20, rock)
player2 = player2 + 3
end

[Nicko01]

lol, I made rock paper scissors for my old calculator, a casio fx 9750g plus.
I had to type all the things in on the stupid calculator and it made me so mad...
it was text only too...
much better with lua.

[GuitarGod1134]

thanks access denied. i think im gonna actually go really far with this game thing. at first i was just coding it for fun but its a really fun idea and there is one other game but its not being updated.

EDIT: ok how do i make it so that when i press start it exits the game isnt it like
if pad:start() then
os.exit
or something like that.

[TacticalPenguin]

if pad:start() then
break
end

[Access_Denied]

if pad:start() then
break
end

That doesn't exit the game. It switches from one loop to another. os.exit() or System.Quit() exits to the XMB. It's most likely os.exit() but System.Quit() might work too.

[GuitarGod1134]

i tried os.exit() and it just turns the screen black for a second and it starts my game again. one time it even turned the psp off. lol so in that case should i use system.quit()?

[Anti-QuickJay]

does
os.exit()
work on 2.71 SE-B"?
I try it and it never works for me, It just freezes...

[Access_Denied]

i tried os.exit() and it just turns the screen black for a second and it starts my game again. one time it even turned the psp off. lol so in that case should i use system.quit()?

That's the problem with os.exit() it sometimes doesn't work. So if you download LuaPlayer .20 mod by Cools, you can use System.Quit(). It only works with the .20 mod though, not the normal version.

[Anti-QuickJay]

That's the problem with os.exit() it sometimes doesn't work. So if you download LuaPlayer .20 mod by Cools, you can use System.Quit(). It only works with the .20 mod though, not the normal version.

Where can i download the mod?

[GuitarGod1134]

o ok well at the moment im running .20 so i guess ill download the mod thanks. and one more thing to generate a random number isnt it like math.random or something like that but how would you generate a random number between 3-5. like the psp chooses its self either 3, 4 or 5 but random. ?? im looking on evilmana right now cant find anything.
EDIT: I think i found it
http://evilmana.com/tutorials/codeba...om_numbers.php
is that it? pretty sure thats right.

[TacticalPenguin]

math.random(3,5)

[MSeven]

i have a scrolling background. it repeats it self as it scrools from right to left. but my problem is after it repeats itself twice, it doesnt repeat itsself again leving me with a black background

bg=background

bgy = 482

bgy = bgy - 5

if bgy<= 482 then
bgy = 0
end

if bgy>1 then
bgy = bgy - 481
end

screen:blit(bgy,0,bg)
screen:blit(bgy+bg:width(),0,bg)

-= Double Post =-
nevermidn i got it

[GuitarGod1134]

math.random(3,5)

would i do something like this
if pad:r() then
computer = math.random(3,5)
and ya computer is a variable name

[trex6662k5]

Can someone give me an example of how to write text thats right justified? I had attempted once but the amount of padding would change depending on the letters and the writing isnt going to be always the same...

[Anti-QuickJay]

Just use screenprint but make the pixels on the right part of the screen.

[GuitarGod1134]

Ok heres part of my code here

if pad:r() then
computer = math.random(3,5)
end

but the problem is as soon as i press r my pic goes away and the variable returns to its orginal state. how can i make it so that one press of r and boom the pic stays blitted and the variable stays at the random selection. also i tried holding r and since its random it doesnt work it just keeps changing.
-- Also with the progress im making we may see Lua RPS v0.02 by tomorrow or maybe even today lol.

[TacticalPenguin]

Something like

computer = math.random(3,5)
if computer == 3 then
blah
end
if computer == 4 then
blah
end
if computer == 5 then
blah
end

[GuitarGod1134]

Well I have it like

if pad:r() then
computer = math.random(3,5)
end
--// then further down i have the
if computer == bla bla statements

I thought i would have to do something like oldpad=pad or something so that one i press it i dont have to hold it down.

[Access_Denied]

If you're going to be using math.random, put this line at the beginning of your code:

math.randomseed(os.time() )

[GuitarGod1134]

If you're going to be using math.random, put this line at the beginning of your code:

math.randomseed(os.time() )

i saw that line on evilmana but shouldnt it be my variable in there too. my variable is computer so shouldnt it be

math.computer(os.time())) ?

EDIT

still need this quesiton

Well I have it like

Quote:
if pad:r() then
computer = math.random(3,5)
end
--// then further down i have the
if computer == bla bla statements

I thought i would have to do something like oldpad=pad or something so that one i press it i dont have to hold it down.

Also is there any definite way to exit the lua script. i see u guys saying that os exit doesnt work and that other function only works on that lua player mod but i want this game to run on all lua players so the common homebrewer will be able to play it.

[TacticalPenguin]

Ok then maybe something like

variable = 0
if pad:r() then
variable = variable + 1
end
if variable > 0 then
computer = math.random(3,5)
end

[GuitarGod1134]

Ill try.

[MSeven]

is it possible to do a collision with dofile, i have my bullet settings in one file and my game in another lua file. i want bullets to do collision with oobjects in my game file. how do i do that

[Grimfate126]

i saw that line on evilmana but shouldnt it be my variable in there too. my variable is computer so shouldnt it be

math.computer(os.time())) ?

ROFL! HAHHAHAHAHAHAHAHAHAHAHA :ROFL: :ROFL: :ROFL: :ROFL: HAHAHAHA..

lol, sorry, couldnt hold myself there. NO, you keep it

math.randomseed(os.time())

random.randomseed is a function, you cant change it.