Lua Programming Help Thread

what type of code

are you sure you posted on the right thread lol
-= Double Post =-

Zitat:

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Zitat von omegaridley

Thx freeplay, it now works!!!

but I still have other problems...

this code is supposed to show how much space I have left on my memory stick:

Code:

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System.getDevSize("ms0:")

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but it doesnt show anything...

anyone know?

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some pointers:

1. use a menu
2. System.getDevSize() only returns the size, to show it e.g. System.message(System.get DevSize(),0)
3. that code is bad
4. i made one of these just to test all of the functions here is the code

Code:

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System.memclean()

System.usbDiskModeActivate()

white = Color.new(255, 255, 255)
red = Color.new(255,0,0)
green = Color.new(0,255,0)
blue = Color.new(0,0,255)

options = { "PSP Information", "Set Cpu Speed To 133", "Set Cpu Speed To 266", "Set Cpu Speed To 333", "Re-Load" }

current = 1

function printg(x, y, text, colour, display)
        if colour == nil then
                colour = Color.new(255, 255, 255)
        end
        if display == nil then
                display = screen
        end
        for xbg = -1, 1 do
                for ybg = -1, 1 do
                        display:print(x + xbg, y + ybg, text, Color.new(0, 0, 0))
                end
        end
        display:print(x, y, text, colour)
end

function printgc(y, text, colour, display)
        if colour == nil then
                colour = Color.new(255, 255, 255)
        end
        if display == nil then
                display = screen
        end
        x = 240 - ((string.len(text) * 8) / 2)
        for xbg = -1, 1 do
                for ybg = -1, 1 do
                        display:print(x + xbg, y + ybg, text, Color.new(0, 0, 0))
                end
        end
        display:print(x, y, text, colour)
end

function Display_Menu()
        for i = 1, table.getn(options) do
        printgc(30 + ((i - 1) *10), options[i], white)
        end
        printgc(30 + ((current - 1) * 10), options[current], green)
end

if System.powerGetBatteryChargingStatus() == 1 then
        bat_stat = "Charging"
else
        bat_stat = "In Use"
end

function Menu_Controls()
        if pad:up() and not oldpad:up() then
                if current > 1 then
                        current = current - 1
                else
                        current = table.getn(options)
                end
        elseif pad:down() and not oldpad:down() then
                if current < table.getn(options) then
                        current = current + 1
                else
                        current = 1
                end
        end

        if pad:cross() and not oldpad:cross() and current == 1 then
                System.message("PSP Version: " .. System.cfwVersion() .. "\nNick Name: " .. System.nickName() .. "\nBattery Status: " .. bat_stat .. "\nBattery Percentage: " .. System.powerGetBatteryLifePercent() .. "%" .. "\nTime Left: " .. System.powerGetBatteryLifeTime() .. "\nLua Player HM: V" .. System.playerVer(), 0)
        elseif pad:cross() and not oldpad:cross() and current == 2 then
                System.setLow()
        elseif pad:cross() and not oldpad:cross() and current == 3 then
                System.setReg()
        elseif pad:cross() and not oldpad:cross() and current == 4 then
                System.setHigh()
        elseif pad:cross() and not oldpad:cross() and current == 5 then
                dofile("./function_dump.lua")
        end
end

oldpad = Controls.read()

while true do

pad = Controls.read()

screen:clear(blue)

-- insert your main code here

printgc(10, "Lua Player HM Function Dump By [email protected]", green)

Display_Menu()
Menu_Controls()

printgc(260, "Hi " .. System.nickName(), green)

-- insert your main code here

if pad:start() then
        break
end

oldpad = pad

screen.waitVblankStart()
screen.flip()

end

---

thx [email protected], youve helped me yet again!


ur the best!!!

so now, what you told me should get the rest of my code to work.

this leaves me to 1 more question!

ok, on Ogg playback, the song I have only plays 1 time, How do I make it loop? here is the code I am using:

Code:

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Ogg.load("SYSTEM/music/system.ogg")
Ogg.play

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it works, the music plays, but it doesnt loop, so it only plays once

looking at the commands in luaplayer hm for ogg files i would say it is probably one of these

Code:

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Ogg.EndOfStream()
Ogg.songTime()
Ogg.mode()

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Yes, looking at the source Ogg.EndOfStream() returns a string "true" when an Ogg file has finished playing so just put in your main loop:

Code:

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

---

Zitat:

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Zitat von SG57

Yes, looking at the source Ogg.EndOfStream() returns a string "true" when an Ogg file has finished playing so just put in your main loop:

Code:

---

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

---

---

ok, i understand now, but after I put in that line of code, it game me this error:

:16: attempt to call field 'EndOfStream' (a nil value)

here is line 16:

Code:

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

---

it wont work, and the functions.txt even shows the function!!!

any ideas?

did you acctually put code after

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

??
or is that it?
cause if thats all you put, then you need to add
Ogg.play() end

Zitat:

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Zitat von PSProgramer

did you acctually put code after

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

??
or is that it?
cause if thats all you put, then you need to add
Ogg.play() end

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yes, i put code after

Code:

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

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and it still isnt working...

Do you have an Ogg loaded? Looking at the source code of LP, the eof integer is initialized to 0 when an Ogg is loaded so trying to access it before an Ogg is loaded will return nil..

Zitat:

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Zitat von SG57

Do you have an Ogg loaded? Looking at the source code of LP, the eof integer is initialized to 0 when an Ogg is loaded so trying to access it before an Ogg is loaded will return nil..

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so ur saying to load the Ogg AFTER this code is executed?:

Code:

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

---

cause, i can easily move the loading code below it
-= Double Post =-

Zitat:

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Zitat von omegaridley

so ur saying to load the Ogg AFTER this code is executed?:

Code:

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

---

cause, i can easily move the loading code below it

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no that didnt work either, i dont understand, is it a bug

i am using LuaPlayerHM v6.6, and the code u have me is in the functions list!

how do you get in to use the code?

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...?

Zitat:

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Zitat von scryerth

how do you get in to use the code?

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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.

Zitat:

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Zitat von 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...?

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

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...?

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")
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

---

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?

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

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

Zitat:

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Zitat von jaki54321

I still cant get the Ogg to work...

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oops ignore my post, wrong forum...

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

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

Zitat:

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Zitat von drag_93

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

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there is your problem

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.

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

Code:

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

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

i will try thank you

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

screen:print(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

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

not if you know c no

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.

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

Zitat:

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Zitat von 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

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so true :)

Zitat:

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Zitat von 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

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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

Not True ifiwere1337: PSPMillionaire BEST Lua Game Ever

Zitat:

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Zitat von xpack

Not True ifiwere1337: PSPMillionaire BEST Lua Game Ever

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thats not a card game, is it?

Zitat:

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Zitat von xpack

Not True ifiwere1337: PSPMillionaire BEST Lua Game Ever

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

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

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

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:

Code:

---

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.)

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 :)

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.