Lua Programming Help Thread

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

Code:

---

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?

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.

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?

Code:

---

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

---

Zitat:

---

Zitat von 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?

Code:

---

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)

Zitat:

---

Zitat von ShockD

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

Zitat:

---

Zitat von Altair

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.

Zitat:

---

Zitat von emericaska8r

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

Code:

---

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 :D

no problem.

Zitat:

---

Zitat von Altair

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

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.

Zitat:

---

Zitat von 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.

---

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

Code:

---

damage = math.random(6)

---

2. put this:

Code:

---

math.randomseed(os.time())

---

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

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.

Zitat:

---

Zitat von Grimfate126

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.

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.

THat worked;, thanks GrimFate.

Zitat:

---

Zitat von 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.

---

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.

Zitat:

---

Zitat von SG57

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.

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.

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:

Code:

---

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

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
screen:print(10,10,"TEST TEST TEST", red)
screen.flip()
end

Zitat:

---

Zitat von Floppydrive

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
screen:print(10,10,"TEST TEST TEST", red)
screen.flip()
end

---

Close but no cigar yet...

Code:

---

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...

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. :(

Zitat:

---

Zitat von 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. :(

---

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.

Code:

---

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: :(

Code:

---

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?

Zitat:

---

Zitat von EminentJonFrost

Code:

---

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. :):):):):):):):):):):):): ):):):):):):):):):)

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

Zitat:

---

Zitat von 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

---

www.evilmana.com/tutorials

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

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

Yup, you do this:

In your while true do loop put this code just below:

Code:

---

pad = Controls.read()

---

Now, below that put this:

Code:

---

if pad:cross() and pad:square then
action here
end

---

you can of course change cross and square to what ever buttons you want.

Zitat:

---

Zitat von kozine

Yup, you do this:

In your while true do loop put this code just below:

Code:

---

pad = Controls.read()

---

Now, below that put this:

Code:

---

if pad:cross() and pad:square then
action here
end

---

you can of course change cross and square to what ever buttons you want.

---

Thank you :) but do i need a () at the end of the other pad:button

Yea you do sorry:

Code:

---

if pad:cross() and pad:square() then
action here
end

---

Zitat:

---

Zitat von kozine

Yea you do sorry:

Code:

---

if pad:cross() and pad:square() then
action here
end

---

---

Thank you :)
Last question, can i limit the amount of time
you can use this?

Probaly but I dont know how. Sorry!

Zitat:

---

Zitat von kozine

Probaly but I dont know how. Sorry!

---

Thabk you for your help, Ill leave that out for now :)

Zitat:

---

Zitat von Ralan

Thank you :)
Last question, can i limit the amount of time
you can use this?

---

Try

Code:

---

controltimer=0

if pad:cross() and pad:square() and controltimer <= 10 then
--\\action here\\--
controltimer=controltimer+1
end

---

That should count the control's until they are pressed 10 times.
You may also need to insert another function to stop the pad
from looping really fast ;).

Sorry i just woke up so i can't exactly give a you a 110% brilliant
padtacular code snippet :icon_razz .

I think u mean:

Code:

---

if pad:cross() and oldpad:cross() ~= pad:cross()

---

Add that to your if(the one c5cha7 showed),and make it suit your code(the button inputted may be different)to slow down the pad looping.

EDIT try this:

Code:

---

controltimer=0

if pad:cross() and pad:square() and oldpad:cross() ~= pad:cross() and oldpad:square() ~= pad:square and controltimer <= 10 then
--\\action here\\--
controltimer=controltimer  +1
end

---

I think thats right...
--Vaza

Code:

---

controltimer=0

if pad:cross() and pad:square() and oldpad:cross() ~= pad:cross() and oldpad:square() ~= pad:square and controltimer <= 10 then
--\\action here\\--
controltimer=controltimer    +1
end

---

I've been meaning to ask this a long time: Whats with the "oldpad" and "pad" people keep using? Whats the difference?

Zitat:

---

Zitat von EminentJonFrost

Code:

---

controltimer=0

if pad:cross() and pad:square() and oldpad:cross() ~= pad:cross() and oldpad:square() ~= pad:square and controltimer <= 10 then
--\\action here\\--
controltimer=controltimer    +1
end

---

I've been meaning to ask this a long time: Whats with the "oldpad" and "pad" people keep using? Whats the difference?

---

Well you put oldpad = Controls.read() at the beginning of the code. It makes it so you cant hold down the button to do the action, you have to hit it repeatedly.