Lua Programming Help Thread

[emericaska8r]

bronxbomber, for your code, would you want this at the beginning:

while true do
screen:clear()
screen:blit(0, 0, menu)
screen.flip()

pad = Controls.read()
if pad:cross() then
screen:clear()
break
end
end
i=1
while i<=17 do
    screen:clear()
    counter:start()
    screen:blit(0, 0, background) .............

So that when you press x or 'c' the menu will be cleared, and go on to the rest of the code?

[emericaska8r]

Also, can someone explain using the analog stick in games. I'm not even as experienced as GrimFace when it comes to that. Any help would be appreciated.

[emericaska8r]

can someone explain how to draw a circle? i found this code, yet how do i make it work currectly? Can anyone explain this too?

function drawCirc(where, x, y, radius, color)

	theta = 0

	while theta<=360 do
		where:drawLine((math.sin(    theta)*radius)+x, (math.cos(theta)*radius)+    y, (math.sin(theta+1)*radius    )+x, (math.cos(theta+1)*radius    )+y, color)
		theta = theta+1
	end
end

[Altair]

can someone explain how to draw a circle? i found this code, yet how do i make it work currectly? Can anyone explain this too?

function drawCirc(where, x, y, radius, color)

	theta = 0

	while theta<=360 do
		where:drawLine((math.sin(    theta)*radius)+x, (math.cos(theta)*radius)+    y, (math.sin(theta+1)*radius    )+x, (math.cos(theta+1)*radius    )+y, color)
		theta = theta+1
	end
end

Say you want to draw a red circle on the screen at x=120 and y=100 with a radius of 20.
You would use: drawCirc(screen, 120, 100, 20, red)

[Altair]

It's not possible to load an image greater than 512x512. Yeah that's exactly what I did so thanks anyway.

ShockD

Nevermind what he said. People are to lazy to try stuff out for them selfs.
I used a 1000x1000 JPG so not a PNG. And my image was about 58Kb. You have to make sure it isn't too big. Im not sure where the limit is, so just keep it as low as possible. I didn't do anything special other then that. I just blit the part that is supposed to be seen on the screen.
BTW Shine himself said it was a bug, so people are right about what it should've been. You probably read that aswell at ps2dev.

Oh and Im using LUAplayer 0.16

[Grimfate126]

Nevermind what he said. People are to lazy to try stuff out for them selfs.
I used a 1000x1000 JPG so not a PNG. And my image was about 58Kb. You have to make sure it isn't too big. Im not sure where the limit is, so just keep it as low as possible. I didn't do anything special other then that. I just blit the part that is supposed to be seen on the screen.
BTW Shine himself said it was a bug, so people are right about what it should've been. You probably read that aswell at ps2dev.

Oh and Im using LUAplayer 0.16

are you serious?? it doesnt work for me. i DID try it out. both png and jpg, and my images size was 600x700 (it was a map). on luaplayer .16, it says error loading image. sry, i guess i kinda did give the impression that i hadnt tried it out.

[Bronx]

bronxbomber, for your code, would you want this at the beginning:

while true do
screen:clear()
screen:blit(0, 0, menu)
screen.flip()

pad = Controls.read()
if pad:cross() then
screen:clear()
break
end
end
i=1
while i<=17 do
    screen:clear()
    counter:start()
    screen:blit(0, 0, background) .............

So that when you press x or 'c' the menu will be cleared, and go on to the rest of the code?

thanks

[emericaska8r]

no problem.

[emericaska8r]

Say you want to draw a red circle on the screen at x=120 and y=100 with a radius of 20.
You would use: drawCirc(screen, 120, 100, 20, red)

Okay I get it now. Thanks

[emericaska8r]

Can anyone tell me whats wrong? In my game I have
damage = math.random(0,6)
this works fine, but everytime I play the numbers are always the same. Example: I play once, and the damages are 5 then 1 then 6. Then I play later, the damges are still 5 then 1 then 6.

[Grimfate126]

Can anyone tell me whats wrong? In my game I have
damage = math.random(0,6)
this works fine, but everytime I play the numbers are always the same. Example: I play once, and the damages are 5 then 1 then 6. Then I play later, the damges are still 5 then 1 then 6.

1. you dont need the "0" in the parenthesis. just put:

damage = math.random(6)

2. put this:

math.randomseed(os.time())

at the VERY top of you code. it will give you different numbers now.

[EminentJonFrost]

I had the same exact problem, emericaska8r.
Doing what Grimfate126 said (put: -math.randomseed(os:time() )- ) will fix that. I still dont know how it works though...but it does.

[Altair]

are you serious?? it doesnt work for me. i DID try it out. both png and jpg, and my images size was 600x700 (it was a map). on luaplayer .16, it says error loading image. sry, i guess i kinda did give the impression that i hadnt tried it out.

Yes im serious. Maybe your file was too big. Like I said, mine was pretty small. Its because its just repeating itself. So yeah i could just make it blit tiles, but when i started, this was the easiest and I just kept using it. But it is possible, my first release of REDaLUA can proof it.

[EminentJonFrost]

Does anyone know of any strategy (doesnt necessarily have to be Advance Wars.) game? I something to give me a nudge forward in the game I'm making.

[emericaska8r]

THat worked;, thanks GrimFate.

[SG57]

I had the same exact problem, emericaska8r.
Doing what Grimfate126 said (put: -math.randomseed(os:time() )- ) will fix that. I still dont know how it works though...but it does.

think about it... a tree grows from a seed no? So your random numbers shall grow from a seed too... If you dont put a puesdo seed in there then youll keep getting the same numbers since the seed is the same... but with this, your setting the seed to be the PSPs internal time/clock which is always changing, thus giving you a random number.

[EminentJonFrost]

think about it... a tree grows from a seed no? So your random numbers shall grow from a seed too... If you dont put a puesdo seed in there then youll keep getting the same numbers since the seed is the same... but with this, your setting the seed to be the PSPs internal time/clock which is always changing, thus giving you a random number.

oohhh.
now I feel stupid. lol
thanks for the good explanation, SG57.

[Grimfate126]

can someone PLEASE comipile a luaplayer script for me?? for some reason, it only works on luaplayer .17 dk2. PM me if you want to try compiling it. i cant do it, cause my comp cant handle cygwin, and im leaving for a month on vacation in about an hour.

[PSPduh]

How do you make text stay there if you press X, and you would need to hold it for teh text to stay there. I want it so the text appears and stays when I press X. I tried:

if pad:cross() then
screen:print(10,10,"TEST TEST TEST", red)
screen.flip() --I also tried screen.waitVblankStart()
end

I tried screen.flip OR screen.waitVblankStart(), neither worked. Help
Thank you :icon_smil :icon_smil :icon_smil :icon_smil :icon_smil :icon_smil
--PSPduh

[mannymix03]

you have to make it into a looping thing

(dont ask me about it though, i only program a little bit)

but here is the problem, your program runs, and doesnt check again, you have to get it to run and check

code: (im not sure if this is right)

while 1
if pad:cross() then
screenrint(10,10,"TEST TEST TEST", red)
screen.flip()
end

[SG57]

you have to make it into a looping thing

(dont ask me about it though, i only program a little bit)

but here is the problem, your program runs, and doesnt check again, you have to get it to run and check

code: (im not sure if this is right)

while 1
if pad:cross() then
screenrint(10,10,"TEST TEST TEST", red)
screen.flip()
end

Close but no cigar yet...

while true do
pad = Controls.read()
if pad:cross() then
screen:print(10,10,"TEST TEST TEST", Color.new(255,0,0))
screen.waitVblankStart()
screen.flip()
end

Give that a whirl...

[PSPduh]

If I do what you said SG57, with the screen.waitVblankStart() and screen.flip() under the pad:cross(), it flickers when I hold X, and doesn't stay there when I press it.

[PSPHax0r9]

If I do what you said SG57, with the screen.waitVblankStart() and screen.flip() under the pad:cross(), it flickers when I hold X, and doesn't stay there when I press it.

Then you probably have a screen.flip() somewhere in your code (probably near the end) and it's reflipping it. Try taking out the screen.flip() in SG57's code and see what happens.

[PSPduh]

black = Color.new(0, 0, 0)
white = Color.new(255, 255, 255)
grey = Color.new(127,127,127)
red = Color.new(255, 0, 0) 
green = Color.new(0, 255, 0)
blue = Color.new(0, 0, 255)
yellow = Color.new(255,255,0)
purple = Color.new(120,0,120)
pink = Color.new(255,0,255)
orange = Color.new(255,110,0)

ms = 0
x = 0

while true do
screen:clear(black)
pad = Controls.read()

if pad:up() then
ms = ms - 1
screen.waitVblankStart(4)
end

if pad:down() then
ms = ms + 1
screen.waitVblankStart(4)
end

if pad:cross() then
screen:print(10,10,"DUHDUHDUH", white)
screen.waitVblankStart()
end

screen.waitVblankStart()
screen.flip()
end

If i try the above code then it stays there when I HOLD X, and just appears then disappears if i press it. :Argh: :Argh: :Argh: :Argh:

[EminentJonFrost]

if pad:cross() then
if duh == false then
duh = true
elseif duh == true then
duh = false
end
end

if duh == true then
screen:print(10,10,"DUHDUHDUH", white)
end

that what you're looking for?

[PSPduh]

if pad:cross() then
if duh == false then
duh = true
elseif duh == true then
duh = false
end
end

if duh == true then
screen:print(10,10,"DUHDUHDUH", white)
end

that what you're looking for?

YEs that what I was looking for. Thanks. :):):):):):):):):):):):): ):):):):):):):):):)

[Goldrush]

im trying to get a wav to play with my menu and put it as a varible like all my other sounds and my other sounds work fine but this wav file wont work when i try to load my game on the windows LUA Player the dos box sais error loading sound and crashes so why is it having an error with this wav file but none of my other wav files? is it because the wav it too big of a size or what? the one im trying to play now is 30mb

[PSPHax0r9]

im trying to get a wav to play with my menu and put it as a varible like all my other sounds and my other sounds work fine but this wav file wont work when i try to load my game on the windows LUA Player the dos box sais error loading sound and crashes so why is it having an error with this wav file but none of my other wav files? is it because the wav it too big of a size or what? the one im trying to play now is 30mb

www.evilmana.com/tutorials

[ShockD]

Okay... I'm a little confused right now (I'm about to fall asleep on my keyboard). Well anyway, I have created an empty image that is 480x272. I want to store my two background images in there so it only blits what is shown on screen. Can anybody show me how to do this? I think I would get it if I had a good night's sleep.

Thanks,
ShockD

[Ralan]

Is there any way to make an action ocur only if a certian two buttons are pressed at the same time? Thank you for your time :icon_smil