Lua Programming Help Thread

[TacticalPenguin]

Why is it that the code you put right there in the help post was the exact script sample in the engine sample i gave you? Anyways, it wont go past 1 because of
if areay < 1
That makes it so areax increases by 1 only when it is less than 1, aka when its -1 or 0. Think of it like a coordinate plane with the different areas on it.

[Anti-QuickJay]

Cause i dont want to post the current code so no one can steal it.

[TacticalPenguin]

Oh ok, well thanks for posting my engine for all to use....

[Anti-QuickJay]

LOL, Your welcome!

[EminentJonFrost]

Is there any tutorials for lua's wifi capability's?
(sorry but its an old addition to lua that i never noticed )

not that i know of, but there were some new functions added here that i think regard that:

http://wiki.ps2dev.org/psp:lua_player:functions

at the bottom of the page.

[TacticalPenguin]

I would say download netlib and look at its functions for a while and you'll know all the wifi stuff you need.

[c5cha7]

I need help, Luaplayer PSP won't load my images?
Yet Luaplayer PC loads them fine?

Its a wierd error that i can't fix to save my life ,
it seems as if luaplayer won't allow me to load more
than "so many" images...

Or my script/index.lua is too big (51.94kb).

[TacticalPenguin]

That cant be it, youresam's Lua OS index is 65 + 40 more kb in dofiles at the beginning. What format are the images?

[c5cha7]

That cant be it, youresam's Lua OS index is 65 + 40 more kb in dofiles at the beginning. What format are the images?

All png, but i am starting to think the problem lies within
2.71 SE . I tried another script that usually worked on
my old 1.50 but it's not working on my 2.71.

I think i'll have to downgrade ...

[Grimfate126]

no, the problem is the ram is getting filled. you cant have that many images on PSP. your pc has wayyy more ram. and windows luaplayer uses the PC ram, so you can load as many images as you need.

try reducing your image size, or the number of images.

[Bronx]

no, the problem is the ram is getting filled. you cant have that many images on PSP. your pc has wayyy more ram. and windows luaplayer uses the PC ram, so you can load as many images as you need.

try reducing your image size, or the number of images.

If you mean image size as in bytes then that won't be jack, as the images are decompressed into raw images. So the smaller the image, the less amount of space.

[dracule]

I have a problem
I have this set up to tell how far away from each other things are:

distancex=p1.x-p2.x
distancey=p1.y-p2.y
distance_between= math.sqrt(distancex*distancex + distancey*distancey)

now the trouble is when I check something things:

if distance_between>80 then
do stuff
end

It only works when i am horizontal from player2, when I am underneath player2, It does nothing... What could be causing this problem?

[GuitarGod1134]

ok so what if i have something like this

while true do
if player[1].x == 400 then
dofile ("level2.lua")
end

in level2.lua would i need to make another (main loop) while true do or do i just continue as is? do i need to define my colors again? Im confused on how do files work???. help

[Grimfate126]

ok so what if i have something like this


in level2.lua would i need to make another (main loop) while true do or do i just continue as is? do i need to define my colors again? Im confused on how do files work???. help

basically, dofile switches control to the other file. so no, you dont need to redfine anything. just look at it as copying the entire file whereever you use the dofile command.

[dracule]

To my understanding with trial and error, dofile just takes what is in the other file and loads it into yours.

for example this is your main file:

code code code code code
code code code code code
dofile("./file.lua")
code code code code code
code code code code code

and have this in your "file.lua":

code2 code2 code2 
code2 code2 code2

luaplayer reads it like this:

code code code code code
code code code code code
code2 code2 code2 
code2 code2 code2
code code code code code
code code code code code

it still is doing all the code you wrote in your main file if you do not set up something to stop that code...

I think of it as just inserting what is in your file you are doing, into where you put dofile

[EminentJonFrost]

I have a problem
I have this set up to tell how far away from each other things are:

distancex=p1.x-p2.x
distancey=p1.y-p2.y
distance_between= math.sqrt(distancex*distancex + distancey*distancey)

now the trouble is when I check something things:

if distance_between>80 then
do stuff
end

It only works when i am horizontal from player2, when I am underneath player2, It does nothing... What could be causing this problem?

i cant see anything wrong from you posted...can you put up whatever is actually in place of "do stuff"?

[GuitarGod1134]

Ok thanks guys explains a lot now.

[myschoo]

To my understanding with trial and error, dofile just takes what is in the other file and loads it into yours.

for example this is your main file:

code code code code code
code code code code code
dofile("./file.lua")
code code code code code
code code code code code

and have this in your "file.lua":

code2 code2 code2 
code2 code2 code2

luaplayer reads it like this:

code code code code code
code code code code code
code2 code2 code2 
code2 code2 code2
code code code code code
code code code code code

it still is doing all the code you wrote in your main file if you do not set up something to stop that code...

I think of it as just inserting what is in your file you are doing, into where you put dofile

hmm that explains why when i play game i move in main menu o_O:Argh:

[GuitarGod1134]

Doesnt the break command change what loop your in? If so could i include multiple while true do's? So like

while true do
code hes running hes running hes running
makes it to the edge of screen
break
end
while true do
hes running on level 2 hes running makes it to the edge
break
end

would something like that work or can i only have one loop? cant in C++ you have multiple loops like

while (variable > 0)
{
cout << "ONE IS I BIGGER THEN 0";
variable = variable - 1;
}
else
{
cout << "deleting flash0 "
}

isnt that multiple loops or am i confused?
EDIT: O and pardon my C++ its not that good. lol
EDIT2: OR is can it all be done with just one loop?

[TacticalPenguin]

For that specific use for having multiple loops, theres a MUCH more efficient way, and as for having multiple loops do something like this:

done = false
while done == false do
-blahblah
done = true --Equivalent to "break"
end

However i believe you should only have 1 while true do loop.

[myschoo]

shot = Sound.load("bullet.wav",f alse)

while true do

pad = Controls.read()

screen:clear()
--screen:blit(0,0,bg)

screen:blit(Player.y,Play er.x,player)

movePlayer()

screen.waitVblankStart()
screen.flip()

if pad:cross() then
shotlay()
end

end

i want it when i press cross i hear sound but i can only hear maybe 0,00001 sec of that sound...pls help

[GuitarGod1134]

I guess you should use like a timer or something start the timer when X is pressed and play the wav file and if it reaches like 10 or whatever stop the wav file.
-= Double Post =-
Ok I have a problem again. I have my guy shooting his musket and i want to know how i can make it so that if he hits any demon they will die. how would i do that? I know collision detection like

if bullet[1].x == demon[1].x then
bla bla
end

but how would i make it so that i dont have to rewrite that six times for all six demons on the screen? Also what would i put where bla bla is? how do i make it so the demons dissapear apon getting shot????

[myschoo]

that looks a bit complicated...maybe something more simple?

[c5cha7]

no, the problem is the ram is getting filled. you cant have that many images on PSP. your pc has wayyy more ram. and windows luaplayer uses the PC ram, so you can load as many images as you need.

try reducing your image size, or the number of images.

Okay thanks, i'll try that.

Guess it did kinda work,
but i think the problem was my image its self .

[MSeven]

i have a game DEVKIT that makes level tiles, so it makes out the level for you, its a side scroller, so the terrain goes up and down and there is stuff to jump over and such, but it saves it into a "blah.lev" file, is there a way to use the .lev file in lua, if not is there any other game level maker for lua

[GuitarGod1134]

Heres a devkit striaght from these forums themselves.
http://forums.qj.net/f-psp-developme...kit-51223.html
-= Double Post =-
nvm thats not the one ur looking for.

[slicer4ever]

@gurtargod just use a for loop:

for i = 1,6 do
 if bullet[1].x == demon[i].x then
bla bla
end
end

it's that simple

[GuitarGod1134]

bla i cant find any. but if you wanna contine the search all i did was yahoo lua dev kit maybe they have one on the lua website.

[slicer4ever]

and
@myschoo is the sound possible running into conflict because when you tap that x it does it like five times unless you add in oldpad

[MSeven]

does anyone know of any level makers? or if i can use the .lev files somehow?