Lua Programming Help Thread

[Hedzx]

nvm ill post it sokmewhere else

[Virtue]

I answered it, but future lua help, please ask here.

[paulieweb]

Are double arrays possible in lua (ie count[i][j])? I thought I remembered reading they are and set mine up as follows:

marked = {}{} -- initialize

marked[i][j] = 3 --later

and when trying to run on luaplayer i get a general error message, "unexpected symbol near '{' "

[paulieweb]

found a way:

marked = {}
i = 0
while i < 16 do
marked[i] = {}
j = 0
while j < 16 do
marked[i][j] = 0
j = j + 1
end
i = i + 1
end

[SG57]

i cant acces the resizer page post the code here

[st.jimmy]

if pad:cross() then
	screen:print(50,60, "you pressed x, buddy")
	end
if pad:circle() then 
	screen:print(50,60, "that was a circle")
	end
if pad:triangle() then 
	screen:print(30,60, "my calculations say that you just pressed triangle")
	end
if pad:square() then
	screen:print(50,60, "you're a square")
	end
screen.waitVblankStart(0)  
screen.flip

whats the problem with this script?

[xigency]

i think it should just be screen:waitVblankStart( ) without the 0

[st.jimmy]

i think it should just be screen:waitVblankStart( ) without the 0

lemme try it....
hmm.. same error.
the exact error i am getting is:
'=' expected near '<eof>'
yes, its on line 14

[Lancer]

screen.flip()

Edit: If that doesn't work, then post the full code. If that is the full code, then you need to add a loop and screen:clear().

[st.jimmy]

screen.flip()

Edit: If that doesn't work, then post the full code. If that is the full code, then you need to add a loop and screen:clear().

thx, but now im getting a new error. That was the entire code, too. therror is on line one:
'attempt to index global 'pad' (a nil value)

please dont go hard on me, im only a newb at this.

[Lancer]

It's okay, we're all newbies when we start out.

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

while not pad:start() do
   pad = Controls.read()
   if pad:cross() then
      screen:print(50,60, "you pressed x, buddy", white)
   end
   if pad:circle() then 
      screen:print(50,60, "that was a circle", white)
   end
   if pad:triangle() then 
      screen:print(30,60, "my calculations say that you just pressed triangle", white)
   end
   if pad:square() then
      screen:print(50,60, "you're a square", white)
   end
   screen.waitVblankStart()    
   screen.flip()
   screen:clear()
end

Pad was a nil value because you didn't give it one. You have to do "pad = Controls.read()". You could also change pad to anything else, such as "input = Controls.read()", then you would check what button is being pressed with "input:circle()", for example.

If your code isn't in a loop, then LuaPlayer will go through the code once, then end the program. I set the loop to go until it detects that you are pressing the start button.

After "screen.flip()" you should put "screen:clear()" to clear the backbuffer, or else the backbuffer will have the image from the previous screen. It might help if I drew an example for you.

Tell me if you want me to explain something in more detail. It's always nice to know how things work, rather than just knowing that they do.

[youresam]

It's okay, we're all newbies when we start out.



Pad was a nil value because you didn't give it one. You have to do "pad = Controls.read()". You could also change pad to anything else, such as "input = Controls.read()", then you would check what button is being pressed with "input:circle()", for example.

If your code isn't in a loop, then LuaPlayer will go through the code once, then end the program. I set the loop to go until it detects that you are pressing the start button.

After "screen.flip()" you should put "screen.clear()" to clear the backbuffer, or else the backbuffer will have the image from the previous screen. It might help if I drew an example for you.

Tell me if you want me to explain something in more detail. It's always nice to know how things work, rather than just knowing that they do.

screen.clear()?
You mean screen:clear()

[Lancer]

Yes, screen:clear(). >_>

Instead of "screen.flip()", you can use "screen:flip()" if you want.

This brings me to a question that I need answered: what are the meanings of ":" and "."? The fact that both "screen.flip()" and "screen:flip()" work, yet "screen.clear()" doesn't confuses me. =P

[Master Inuyasha]

Okay, can someone help me with a startup menu. I have the background and all, but how do i make text appear, and you can select it. ALso, how can you order your script so you know what is what? Thanks, also anyone willing to teach me lua like alot of stuff, pm me! Thanks in advance!!!!

[Virtue]

Are you planning to use images or text on the menu? For like all the options, like start game, etc. Will it be images or text?

[Master Inuyasha]

It going to be text, kiind of like links, you know. Meaning, you go on link, start for this example, and it starts the game, etc.

[Master Inuyasha]

Im having a problem, the code ive scripted so far works perfectly in the lua player, but once i turn it in an eboot, doing what anotehr user said to do, it doesnt do all the code. What do you think is wrong?

[Virtue]

I can fix it, but you will have to wait until I get home. I'll fix it then. What exactly have you tried to do?

[Master Inuyasha]

dont know who said it, but a guy said, get an eboot that is used with a lua application. I did that. Then he said open it up, the put your own icon0 etc to make it your own. I did that. I included the pictures, but the tricked out loading screen i made skipps from 0% all the way to the menu! I wonder why. BTW, when do you get back from school? Im in Florida, so i dont have to go to school because of Hurricane Wilma.

[st.jimmy]

anybody know how i can create labels?

like:
lbl b
then later:
goto b

[Virtue]

No, you don't really need to use labels.

Cause you just do like, if whatever = true then

So, you don't really need any labels or goto's, but either way I don't know how.

Sorry

[st.jimmy]

No, you don't really need to use labels.

Cause you just do like, if whatever = true then

So, you don't really need any labels or goto's, but either way I don't know how.

Sorry

damn, on my opinion that's the most helpful part of coding....

[Master Inuyasha]

okay, im having trouble with this peice of code. Now, i want to do, is if usb mode is active, it shows a little picture, here is what i did, and it doesnt work

if System.usbDiskModeActivat e() true then screen.blit(460, 260, usb, false)
else
end

[MagicianFB]

okay, im having trouble with this peice of code. Now, i want to do, is if usb mode is active, it shows a little picture, here is what i did, and it doesnt work

if System.usbDiskModeActivat e() true then screen.blit(460, 260, usb, false)
else
end

That's because System.usbDiskModeActivat e() turn on the usb, it doesn't return a value. You also don't need else there. Also leave out the false, unless you don't want your picture to have transparency at the parts it had transparency in the .png.
Here, try this:

usbStatus;

function usbON()
	System.usbDiskModeActivate()
	usbStatus = true
end

function usbOFF()
	System.usbDiskModeDeactivate()
	usbStatus = false
end

if UsbStatus then
	screen.blit(460, 260, usb)
end

ignore the strange spaces in the middle of the usbDiskModeActivate and usbDiskModeDeactivate, it's just something the forum does.

[MagicianFB]

anybody know how i can create labels?

like:
lbl b
then later:
goto b

Labels are pointless since there are loops and functions.

[Virtue]

Exactly what I said ^ :)

[st.jimmy]

well then how do i make a loop?

[Virtue]

while true do

[st.jimmy]

while true do

ohkay?
i just dont see how that will make the program loop over and over again.
well i have a problem where the 'end' code is executed before i can press a button.... i know that you have seen the script.

[SG57]

wats the resizer function