Lua Programming Help Thread

[EminentJonFrost]

want me to send it to you.

sure

sorry madsoul, nope. (dont know any)

[madsoul]

sure

sorry madsoul, nope. (dont know any)

damn... i need it for my breakout game.. thanks anyway

[PSPduh]

damn... i need it for my breakout game.. thanks anyway

I found a collosion tutorial: GUIDE: Collisions
Cant wait for the breakout game! :Punk:

[madsoul]

I found a collosion tutorial: GUIDE: Collisions
Cant wait for the breakout game! :Punk:

thx man! :) il put you somewhere in the credits as a helper... ;)

[PSPduh]

Thank you. And to tell you the truth, I just put in "collision" in search, and thats what it came up with.

[ZereoX]

I have a little probleme making my guy move left and right

function playerright()
screen:blit(player.x,player.y,walkingright1)
screen:blit(player.x,player.y,walkingright2)
screen:blit(player.x,player.y,walkingright3)
end

but the problem is that all the image stack is there a way to do

screen:clear(player.x,pla yer.y,walkingright1)
EX:

function playerright()
screen:blit(player.x,player.y,walkingright1)
screen:clear(player.x,player.y,walkingright1)
screen:blit(player.x,player.y,walkingright2)
screen:clear(player.x,player.y,walkingright2)
screen:blit(player.x,player.y,walkingright3)
screen:clear(player.x,player.y,walkingright3)
end

[natan333]

i have a question

x0 = math.sin(1 / 100 * time) * 190 + 195

what does / mean?

[SG57]

The '/' means division.

* = multiply, + = add, - = subtract and / = divison

^ = exponent

[Bronx]

hello, could anyone please help me with a simple tic tac toe AI? i would really, really appreciate it :) thanks

[Deanaw22]

Have you read vaza's tutorial, if not heres a link http://forums.qj.net/psp-development-forum/50267-ai-tutorials-vaza-post628359.html#post628359

[Bronx]

yeah, i was the one who rewuested them ;) i guess i'll just be patience

[ZereoX]

How can i do a leveling collision what i mean by that is this Ex: like when i touch the floor the gravity changes.!?

[natan333]

How can i do a leveling collision what i mean by that is this Ex: like when i touch the floor the gravity changes.!?

if you know how to set up gravity and stuff,
i think to make that place to change it
you'll have to do something like

if true then 
if x0 >= 100 and x0 <= 200 and y0 >= 90 and y0 <= 100 then
(change gravity)
end
end

the 1st x0 and y0 is the object positions. the 2nd x0 and y0 is the ending of that object.
but hey, i dont know if this is what you need

[slicer4ever]

i personally believe that the people who made lua in there next update should add a hittest and rotation command into lua i mean i know it wouldn't be easy(or at least i don't think it would) but it would end so many problems that people are asking

[SG57]

...your joking right? I could easily add collision to the LuaPlayer... Its jsut i have a C collision detection function/prototype setup... So id have to convert to C++... So if anyone couyld do that theres collision for you... or i could just convert my Collision detection into a brand new 'lib' for LUA, kind of like netlib, but full of math commands if you will... Likely to be added next would be rotation via angles, but not radians, which i may just add a few lines to convert that way...

If anyone would like to help with such a thing, just PM, and i may think about doing such a thing. Itll be like netlib...but instead of WLAN functionality, itll be math and such...

[slicer4ever]

i said it would end many people probs and no i'm not jokeing trying to get collision to work properly isn't that easy to the noobies so thus a hittest command would make it really easy for them and i would enjoy a rotation feature(sorry if mispelled)

[montrob]

Is there any word or notepad like program that can do something like this?

See i have a long function.. but i have about 10 different ways to do that function.. and i need to edit about 50 variables like "[1]" to "[2]"... Is there any program that will let me copy and paste and change all the text i choose into something else? Cuz just editing functions from [1] to [2] gets boring fast.

[PSPduh]

I am really sorry for a double post, but now I have a problem. I want it so that a variable increases by 1 everytime my timer increases by 1. my code so far:

red = Color.new(255,0,0)
yellow = Color.new(255, 255, 0)
blue = Color.new(0, 0, 255)
orange = Color.new(223, 88, 6)
grey = Color.new(94, 97, 111)
black = Color.new(0, 0, 0)
white = Color.new(255, 255, 255)
green = Color.new(0,255,0)

duh = Timer.new()
duh2 = duh:time()
x = 470
y = 0

while true do
screen:clear()
duh:start()

if duh2 >= 470 then
screen:blit(470,0,man)
end

screen:blit(x,y,man)

I know that I haven't loaded the man image yet, but I think that you can use a for loop, but I have no idea how that works. Again, everytime the timer increases by 1 I want the x to increase by 1. Help?

Can someone help me with this a few pages back? :icon_sad:

[Grimfate126]

Can someone help me with this a few pages back? :icon_sad:

you could just put:

x = duh2

that should work.

[SG57]

yes, what ever you declared as increasing by 1 second, just have the second variable you want to also = w/e the other cariable ='d or just have it = the other cariab le tat already has the time thing... confusing a little....

anyway, im planning on making a simple lib... but only having collision may not be called a lib... os any more ideas would be great.... as for rotation... im not sure if the PSP's GUM libs have been converted, if not, then it shall be simple trig for rotation... which may be a slow processing time... so.... Oh and maybe an animation prototype as wel, aka function.... Unless youresam is alreay doing so?

[EminentJonFrost]

Is there any word or notepad like program that can do something like this?

See i have a long function.. but i have about 10 different ways to do that function.. and i need to edit about 50 variables like "[1]" to "[2]"... Is there any program that will let me copy and paste and change all the text i choose into something else? Cuz just editing functions from [1] to [2] gets boring fast.

If your using notepad, press the CTRL and H buttons at once.

It'll ask what to find, and what to replace what it finds with.

PSPduh showed me that. VERY handy little feature of Notepad.

[JoeDaStudd]

soz i all ready worked out how to do this my self :Jump:
lua rocks

[montrob]

If your using notepad, press the CTRL and H buttons at once.

It'll ask what to find, and what to replace what it finds with.

PSPduh showed me that. VERY handy little feature of Notepad.

OMG! That feature is AWSM! :Jump: :Jump:


And I need help somewhere else..

My game is going to be played with the psp held vertical.. Is there a way that you can print text to the screen vertical?

[EminentJonFrost]

OMG! That feature is AWSM! :Jump: :Jump:


And I need help somewhere else..

My game is going to be played with the psp held vertical.. Is there a way that you can print text to the screen vertical?

um...the only way i can think of is making a pic with the text you want shown printed sideways.

you mean vertical as in
|
|<shoulder button
|


< top PSP logo bottom >


|
|<shoulder button
|

right?

[montrob]

um...the only way i can think of is making a pic with the text you want shown printed sideways.

you mean vertical as in
|
|<shoulder button
|


< top PSP logo bottom >


|
|<shoulder button
|

right?

ya thats right

[Altair]

Is there any word or notepad like program that can do something like this?

See i have a long function.. but i have about 10 different ways to do that function.. and i need to edit about 50 variables like "[1]" to "[2]"... Is there any program that will let me copy and paste and change all the text i choose into something else? Cuz just editing functions from [1] to [2] gets boring fast.

I know EminentJonFrost already helped with this, but I just wanted to say that Word has a function and you can say what to replace with what and it replaces all of those.

Hmmm also with my notepad of Win98SE its just the same as backspace...

[EminentJonFrost]

maybe this might be of interest to you montrob:

Luaplayer v0.19
==========
- directory detection bugfix [moonlight]
- Changed System.loadModule to loadlib to work. [Oobles
the same as the traditional lua loadlib function
- Made loadlib check if a module is already loaded before trying
to load. [Oobles]
- Removed getLuaState export. No longer required. [Oobles]
- Made debugOutput work in the same way as printf in bootstrap. [Oobles]
- Added loadlib.prx kernel module. required for module loading. [Oobles]
- Added a module sample for manipulating images [Shine]

I havent checked it out yet, but it sounds like what you may be looking for. I'm gonna look into it now.

Edit - I found in the new Luaplayer (version 19) in the Samples folder, this script:

function rotate(image)
	local w = image:width()
	local h = image:height()
	local result = Image.createEmpty(h, w)
	for x=0,w-1 do
		for y=0,h-1 do
			result:pixel(h-y-1, x, image:pixel(x, y))
		end
	end
	return result
end

function printRotated(x, y, text, color, image, rotateIndex)
	rotateIndex = math.mod(rotateIndex, 4)
	local w = string.len(text)
	local result = Image.createEmpty(w * 8, 8)
	result:print(0, 0, text, color)
	if rotateIndex > 0 then
		rotateIndex = rotateIndex - 1
		for i=0,rotateIndex do
			result = rotate(result)
		end
	end
	image:blit(x, y, result)
end

cadetBlue = Color.new(95, 158, 160)

printRotated(132, 0, "Don't ask what Lua Player", cadetBlue, screen, 0)
printRotated(472, 76, "can do for you,", cadetBlue, screen, 1)
printRotated(160, 264, "ask what you can do", cadetBlue, screen, 2)
printRotated(0, 76, "for Lua Player!", cadetBlue, screen, 3)
screen.flip()
while true do
	screen.waitVblankStart()
end

:)

[TheMarioKarters]

If your using notepad, press the CTRL and H buttons at once.

It'll ask what to find, and what to replace what it finds with.

PSPduh showed me that. VERY handy little feature of Notepad.

Wow, that's awesome.
Cheers.

[Bronx]

can any help me with making text return once is hit the edge off the screen? so it doesnt run if the end of the screen? thanks

[slicer4ever]

just set x to 450 so like:
if x > 480 then x = 450 end

very simple