Lua Programming Help Thread

[scryerth]

how do you get in to use the code?

[SG57]

omegaridley - You clearly didnt read my post correctly lol. I said nothing about moving things around or even to load after the code executes. i'm saying that in order for Ogg.EndOfStream() to return anything but nil, an Ogg must be loaded. That's all i'm saying for the second time. You should be able to figure out how to make sure an Ogg is loaded before executing code that contains Ogg.EndOfStream(), if not and even still please start with very early basics and fundamentals, learning by trial and error isn't a very good path to go.

scryerth - what...?

[Nielkie]

how do you get in to use the code?

It sounds like you have a problem with your PSP, not LUA. LUA is just a scripting language for creating basic applications and games. Go post in the PSP General Help forum.

[omegaridley]

omegaridley - You clearly didnt read my post correctly lol. I said nothing about moving things around or even to load after the code executes. i'm saying that in order for Ogg.EndOfStream() to return anything but nil, an Ogg must be loaded. That's all i'm saying for the second time. You should be able to figure out how to make sure an Ogg is loaded before executing code that contains Ogg.EndOfStream(), if not and even still please start with very early basics and fundamentals, learning by trial and error isn't a very good path to go.

scryerth - what...?

i DO have an OGG loaded before the Ogg.EndOfStream(), look at my code:

white = Color.new(255, 255, 255)
green = Color.new(0, 255, 0)
background = Image.load("SYSTEM/images/background.png")
Ogg.load("SYSTEM/music/system.ogg")
while true do
done = false
pad = Controls.read()
if pad:cross() and done == false then

System.message("UMD ISO will be dumped in name 9660.ISO, if u have a UMD dumped by this app, rename the ISO in the memory stick. Are you ready to dump the UMD?",1)
button = System.buttonPressed(1) if button == "yes" then UMD.ripISO("ms0:/ISO/9660.ISO") end
button = System.buttonPressed(1) if button == "no" then end
done = true end
if done == false then

if Ogg.EndOfStream() == "true" then
Ogg.play()
end

screen:blit(0, 0, background, false)
screen:print(1, 1, "Press X to Dump UMD Game", white)
end

but it STILL returns nil...
i have tried Ogg.eos() and the error goes away, but doesnt loop the song...?

[FaT3oYCG]

white = Color.new(255, 255, 255)
green = Color.new(0, 255, 0)
background = Image.load("SYSTEM/images/background.png")
Ogg.load("SYSTEM/music/system.ogg")
Ogg.play()
while true do
done = false
pad = Controls.read()
if pad:cross() and done == false then

System.message("UMD ISO will be dumped in name 9660.ISO, if u have a UMD dumped by this app, rename the ISO in the memory stick. Are you ready to dump the UMD?",1)
button = System.buttonPressed(1) if button == "yes" then UMD.ripISO("ms0:/ISO/9660.ISO") end
button = System.buttonPressed(1) if button == "no" then end
done = true end
if done == false then

if Ogg.EndOfStream() == "true" then
Ogg.play()
end

screen:blit(0, 0, background, false)
screen:print(1, 1, "Press X to Dump UMD Game", white)
end

[dan369]

I need help. Not with scripting but generally, i dont understand wifi much and 3d and would like to know if there are any gd snippets/examples etc. Also with wifi you connect to an server? ( i think) could you possible connect to an web pg OR would you have 2 have your own server, if So how would you make an server?

[FaT3oYCG]

http://tacticalpenguin.com/index.php?page=snippets

[jaki54321]

I still cant get the Ogg to work...
-= Double Post =-

I still cant get the Ogg to work...

oops ignore my post, wrong forum...

[drag_93]

So far i've created a basic menu for a game but i can't go into a sub-menu. When i go into the sub-menu it will execute the file once then go back to the main menu so i'm wondering what the best way to fix this is (i'm guessing some kind of loop)

EDIT: The sub-menu is a separate .lua file loaded into the main script through dofile

[dan369]

Could you post the code up? by sub-menu do u mean options, credits etc.

[FaT3oYCG]

EDIT: The sub-menu is a separate .lua file

there is your problem

[Nielkie]

No, the problem is that he does not have a main loop in his sub-menu. My guess is that he copied the menu code from somewhere and has no idea how games and applications usually run.

[Xarro]

how i can go to next line (with one string?) i used '\n' but it din't work (i see the square)

[dan369]

 
file:write("Player.x = 165 "...\n)

This would be an better example were u would use \n :)

[Xarro]

i will try thank you

[FaT3oYCG]

you can only use the \n statement when saving to a file, you cant for examplr do this

screenrint(10, 10, "hello\n hi")

as it will be on one line, if you load it from a file then you can use

for line in file:lines() do

end

to display then sequentially on the screen

[SuperBatXS]

Wow...i haven't coded lua in a while. Do you guys recommend that i go back to it?

[FaT3oYCG]

not if you know c no

[SuperBatXS]

Why not? Lua is like a sexy blonde chick. They are really hot and juicy, but they are very simple and ignorant to be enticed into your malicious intentions.

[FaT3oYCG]

lol fine but there isnt much left to make, it mainly just for the fun of it that people make stuff in lua anymore

[dan369]

lol fine but there isnt much left to make, it mainly just for the fun of it that people make stuff in lua anymore

so true :)

[ifiwere1337]

lol fine but there isnt much left to make, it mainly just for the fun of it that people make stuff in lua anymore

actually, there havent been many fun card games in lua that i know of, i am making one based of uno, when it is at least playable i am gonna release it

[xpack]

Not True ifiwere1337: PSPMillionaire BEST Lua Game Ever

[ifiwere1337]

Not True ifiwere1337: PSPMillionaire BEST Lua Game Ever

thats not a card game, is it?

[dan369]

Not True ifiwere1337: PSPMillionaire BEST Lua Game Ever

I wouldn't call PSPMillionaire an Card game more like an question game.

[Nielkie]

Just wondering, is there a known limitation in LuaPlayer 0.16 in that it doesn't support semi-transparency when blitting to an image?

[TurtlesPwn]

I don't know for SURE but I almost always run stuff on 0.16 modded with a couple extra functions and I've never had any issues. Details about what you might be referring to and I'll try to recreate it

[Nielkie]

Well, I've got a image buffer, on which I blit unanimated objects at the start of a level and whenever something changes. I just noticed when I transfered one of my more complex objects (rather than just the little sprites I've only been using previously) from my blit-every-frame table to my blit-to-the-buffer table, that it was blocky and aliased. This seams to be because all semi-transparent pixels are being made fully-transparent. Here is the basic scenario:

object = {}
object.pics = {side = Image.load("side.png")}

object[1] = {type = "hexagonthing",x = 0, y = 0, width = 30,height = 30} --This would be created by an object.new function

object.intFunction = {
	["hexagonthing"] = function(aObject)
		object.buffer:blit(aObject.x,aObject.y,object.pics.side)
	end
}

object.intDraw = function()
	object.buffer = Image.createEmpty(480,272)
	object.buffer:clear(Color.new(0,0,0))
	for i,aObject in ipairs(object) do
		object.intFunction[aObject.type](aObject)
	end
end

object.intDraw()

while true do
	screen:blit(0,0,object.buffer)
	screen.waitVblankStart()
	screen.flip()
end

The example image is attached, you will notice is looks a lot better when blitted directly.

P.S. Yeah, 0.16 is great apart from the few annoying things that are broken(SIO,Font:getTextSi ze, etc.)

[dan369]

OK, How would you make an object move without an if statement, AI? I want to move sumthing left and right without any IF statement.
Also How would you do it that so when the object is going back and forth and you hit into this object that you would DIE?

Note: Not good with collisions or Ai, thats why i'm asking 4 help :)

[Khatharr]

If you're going to make an AI it's probably going to have at least one if statement in it. If you want it to walk three spaces left then three spaces right and then loop you'd have to make a loop that checked its position or a counter and caused it to step left until its position was as far left as you wanted and then step right until its position was as far right as you wanted.

step = 0
while 1 do
if step < 3 then
stepleft()
else
stepright()
end
step = (step + 1) % 6
end

As for collision detection you'll just need to compare your x,y with the object's x,y and if they're equal then trigger your 'die' event or whatever. Sorry, this question is really too vague to give more of an answer.

There are tutorials available on AI and collision around the scene. Poke around a bit and see what you can find. These things are not as mysterious or difficult as they may sound.