Lua Programming Help Thread

[icemasta]

thx anyways, ya was playing around with some of the code and it worked. now just have a diff question.
|
|
|
\/


does anyone know how to extract a number from a string?

[%chrono trigger%]

im no expert, but if you typed the code like you did above then your problem is that you have your function inside a table. the format should be:

function functionName()

so you would make it:

function collision(obj1,obj2)

if thats what you want your function named. hope tht helps
Lol you fixed it just as i posted sucks

[slicer4ever]

edit: oops thought this was c/c++ help thread, none of my answers would help

[TurtlesPwn]

thx anyways, ya was playing around with some of the code and it worked. now just have a diff question.
|
|
|
\/


does anyone know how to extract a number from a string?

use string.find and string.sub

read this and don't post until you have read it and learned how the functions worked and tried to figure it out

[FaT3oYCG]

also seen as you are extracting a number from a string you may want to take a look at the tonumber() function, as it would be held as a string because that is what you are extracting it from.

[TurtlesPwn]

if he uses the string as if it were a number, lua will generally autoconvert it - generally tostring is the only casting function ever needed in lua.

[FaT3oYCG]

didnt know that, do now thanks for lettin me know i have never come across that situation, but yeah i was just using logic but if its not needed then what the hey.

[%chrono trigger%]

nvm found one

[SectionEight]

i have a couple questions..

i have this code setup inside of the while loop to exit the game when i want by simply changing the variable Quit to true. It doesnt seem to work. It just freezes the psp.

if Quit == true then
os.exit()
end

also, when i am writing a game and a map editor, and it seems when i go back and forth between the 2 i sometimes get errors like not enough memory or something along those lines. My question is.. Is there a way to clear all the memory from the last .lua you were running so you can start fresh with the new file. Im really new to programming in general and im not sure how im supposed to do everything. learning by trial and error. so i appreciate the help.
thnx in advance.

[TurtlesPwn]

1. os.exit doesn't and never really has worked
2. just manage your memory carefully, use tables and local vars, etc - you really shouldn't ever be running out of memory unless there's something drastic that is being overlooked

[Digikid13]

I need some tuts for PgeLua if anyone can post some links I would be greatful. ^^

[TurtlesPwn]

read my signature

[Digikid13]

read my signature

Didn't tell me anything new.......... =.=
What is the diference between pge.texture.load() and pge.texture.swizzle()???

[slicer4ever]

umm...alot,

swizzle an image allows for the image to be drawn faster, however it does make it harder to modify the image data.
where's loading an image is simple that, loading an image into ram.

[Digikid13]

OK that is good for when I don't need to change an image, but how do I use the image.

mypicture = pge.texture.load("test.png") --This returns a pointer to the image data.
swpicture = pge.texture.swizzle("test.png") --This just returns true or false (maybe 0 or 1).

[chrisp6825]

When you load an image, it automatically swizzles it...
You usually don't need to unless you un-swizzled it, to change the alpha, color, or some pixels.

object = pge.texture.load(filename , [memorylocation], [swizzle])

Parameters:
filename - The name of the PNG image to load.
memorylocation - Optional argument. Either PGE_RAM to load to RAM or PGE_VRAM to load to VRAM. Defaults to PGE_RAM if omitted.
swizzle - Optional argument. A boolean representing whether to swizzle the texture or not. Defaults to true if omitted.

To use the image, depends on how you want to use it.
To print it onto the screen :
pge.texture.draweasy(text ure, x, y, [rotation], [alpha])
or
pge.texture.draw(texture, x, y, [width], [height], [texstartx], [texstarty], [texendx], [texendy], [rotation], [alpha])


http://lmgtfy.com/?q=pge+lua+documentation

[SectionEight]

is there a way to encrypt lua or whatever it is called to hide your source code?
i want to

PGE how much better then regular lua player for psp? i think they are on .20.

would it be worth me moving from lua.20 to using pge?

ill release something for you guys to play as soon as i can find a way to hide the code. I will probably go open source later, but for now its our baby(working with another) and id like to see it through first.

so far we have some basic physics done like Mario(im using those gfx for now)
Sidescroller.

Mario physics include.
run/jump/crouch/climb

theres some makeshift monster code in with a lil ai.

i also have a map editor made with some basic features.
add/delete tile
change tile attributes (visible/collision/kill/rope/warp)
you can save to a user specified name.

anyway..... all of this done using lua player 0.20. is PGE worth moving ny project? Ive been using lplayer and have been running into issues with the psp slowing down. Im sure its my sloppy code but to an extent. Is there any significant speed boost that i can get from pge?

anywho thnx in advance, ill try and release some beta version soon.

[TurtlesPwn]

Didn't tell me anything new.......... =.=
What is the diference between pge.texture.load() and pge.texture.swizzle()???

Did you actually attempt to apply it by reading documentation, searching google, and reading forums? I seriously doubt this.

[Digikid13]

@TurtlesPwn
Hmmm what can I say.....

@SectionEight
Ya it should give you a great boost, PGELUA is made from scrap so everything is made for speed, everything is alot faster.
Here is the Benchmark.
I think it is very well worth it, and as far as I know you can't encrypt lua code.......although if you find anything out plz PM me.

[chrisp6825]

Protecting or Encrypting Lua/PGE code : http://luaplayer.org/forums/index.php?topic=471.0

[TurtlesPwn]

@TurtlesPwn
Hmmm what can I say.....

@SectionEight
Ya it should give you a great boost, PGELUA is made from scrap so everything is made for speed, everything is alot faster.
Here is the Benchmark.
I think it is very well worth it, and as far as I know you can't encrypt lua code.......although if you find anything out plz PM me.

Your perceived knowledge makes me seriously doubt you're using the resources available to find answers. You need to start.

[Digikid13]

Your perceived knowledge makes me seriously doubt you're using the resources available to find answers. You need to start.

Maybe......I'll think about it. I did look for a lua encryptor and I didn't find one =.=

[TurtlesPwn]

Did you look on lua.org?

[Digikid13]

Did you look on lua.org?

No, because I didn't think any tools for PC lua would not work on any PSP lua programs.

[SectionEight]

Im not familiar with pgelua, can someone who has worked with regular luaplayer and pge know if it may be possible to write out a script to maybe convert luaplayer files to pge compatible files.

Im aware that pge will have more functions, but id much rather look through an already converted lua file looking for ways to optimize my code, then it would be for me to totally rewrite the program.

I always seem to have trouble describing what i mean, please lemme know if i made my self clear hehe.

[TurtlesPwn]

No, because I didn't think any tools for PC lua would not work on any PSP lua programs.

You have a terrible misconception on the difference between Lua and Luaplayer etc. Read more, it helps. And did you even click on my link?

sectioneight - while it would be possible, it would not be practical or take advantage of PGE's capabilities. I would recommend looking at PGE's samples and programs written with it and just relearning rather than trying to base off LP's API.

[SectionEight]

yeh ive read over the documentation that they have up and it seems like it would help me out alot, just on the gfx rendering stuff alone. the problem is i am far along in my project and it would sux majorly if i were to have to rewrite everything all over again. I guess im looking for an easy answer where there is none. The advantage would be a speed boost but in order to do that i am going to have to completely rewrite the code. There's no windows pge luaplayer and that would mean i lose my partner. I think ill just wait till they release a windows player .

[chrisp6825]

It's not too hard to switch over to PGE. I did it while in mid project in about 3 hours.
Basically, you only need to rewrite the drawing functions, and texture handling.
Everything else is pretty much fine. PGE has it's own math functions, but Lua's are still there if you don't want to bother.

All I did was look at what the PGE's functions were for drawing and setting up the screen, "find and replace"'d the code, and a bit more tweaking, and I had it done.

Once you get used to, and learn OOP then it's all basically the same.

[Ben93]

Hi guys

I bet this is asked so many times before, but how do you get flash0 access with lua?
This is a small piece of a simple menu with different options, including copying files to flash1.

if pad:cross() and not oldpad:cross() and ms == 1 then
System.removeFile("flash1:/new/test.txt")
end

if pad:cross() and not oldpad:cross() and ms == 2 then
afbeelding1 = Image.load("vc.png")
screen:blit(0, 0, afbeelding1, false)
screen.flip()
screen.waitVblankStart(300)
end

if pad:cross() and not oldpad:cross() and ms == 3 then

direxsist = System.doesDirExist("flash1:/new")
if direxsist == 1 then
else
System.createDirectory("flash1:/new")
screen.flip()
end

curdir = System.currentDirectory()

filexist = System.doesFileExist("flash1:/new/test.txt")
if filexist == 1 then
System.removeFile("flash1:/new/test.txt")
screen.flip()
end
System.copyFile(curdir.."/test1.txt","flash1:/new/test1.txt",0)
screen.flip()
end

What do i have to change to make this work with flash0???

tnx

[Anti-QuickJay]

SG57 made a LuaPlayer with flash write access.
You have to search for it. I remember you had to assign something to something then write a file to flash0.