Lua Programming Help Thread

Thanks LMelior. I should have asked you in the first place :D seeing as its your code.
-= Double Post =-
well, no same problem.. it pauses the game, when X or start is pressed it unpauses and displays the screen for a split second..

What do you mean by: "when X or start is pressed it unpauses and displays the screen for a split second"? Do you mean it shows the game and exits immediatly, OR do you mean it pauses for a split second and immediatly goes back to the game?

Oh yeah, you also forgot to flip the screen in the while loop.

STRANGE ERROR!

As soon as a try to .filip() with another image then screen, i get the "Loop in gettable" error.

I get error fore this(Not the acutall code, just a example)
The <- represents what gives me the error.

Code:

---

background = Image.createEmpty(480, 272)

background:blit(0,0,example) <-
screen:blit(0,0,example)
background.flip() <-
screen.flip()

---

"example" has to be a valid image.
You only flip the screen, you don't flip any other images.

Well, the screen:flip() worked just fine.. this isnt a question but for some reason you can only have a fully transarent image or either a colored image.. say in photoshop i made the image of the start menu frame and added a fully black layer over it.. well when i changed the opacity level to make it like a greyish transparent level it made the image fully black.. but when i deleted that layer its fully transparent.. wierd.

I'm trying to make a simple program that each time u press cross it reads the next or prefferably a random line in a .txt this is the best i can come up with but it doesnt work,

red = Color.new(255, 0, 0)

file = io.open("something.txt", "r")
ourline = file:read()
file:close()

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

if pad:triangle() then
return
end

if pad:cross() then
screen:print(10,10,ourlin e,red)
screen.waitVblankStart()
screen.flip()
end


looking forward to any help.

p.s i'm very new to lua so dont be mean :P
-= Double Post =-
anyone?

not that i'm impatient.. its just been 1 and a half hours and i cant see whats wrong with it :P

Anyone know how to use the Lua GU commands for 3D? I would really like to learn for lua as I learn the actual GU (I know, sounds stupid...)

can someone point me in the direction of the windows lua files?

Zitat:

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Zitat von Hooger

can someone point me in the direction of the windows lua files?

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http://evilmana.com/tutorials/lua_tutorial_01.php

OT - ZOMG!!!!!!!!!!!!!!!!!!!!! ! 1337 POST!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!! !!!!!1111!!!!one!!!!eleve n!!!!!!!!!!!!

=p

thanks mister leet guy

PSPduh - ... just ... lol

Bronx - Check your other post... And why not learn C GU if your doing LUA GU. Its pretty much the same, just the syntax is completely off...

Im learning both ;)

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Zitat von head_54us

"example" has to be a valid image.
You only flip the screen, you don't flip any other images.

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Are you kidding me? I said that it wasen't the actuall code! It's a example!
It is inself the canvas that gives me error. And yes, here comes a example.

Code:

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board:blit(0,0, example)

---

Zitat:

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Zitat von Branin

this isnt a question but for some reason you can only have a fully transarent image or either a colored image.. say in photoshop i made the image of the start menu frame and added a fully black layer over it.. well when i changed the opacity level to make it like a greyish transparent level it made the image fully black.. but when i deleted that layer its fully transparent.. wierd.

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Pretty sure of this:
That's only in luaplayer for windows. Try it on the PSP and it will work fine, unless you aren't saving your transparency levels in Photoshop.

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Zitat von HaxxBlaster

Zitat:

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Zitat von head54_us

"example" has to be a valid image.
You only flip the screen, you don't flip any other images.

---

Are you kidding me? I said that it wasen't the actuall code! It's a example!
It is inself the canvas that gives me error. And yes, here comes a example.

Code:

---

board:blit(0,0, example)

---

---

I'm not sure what you mean this time (this code looks fine to me), but his second sentence was the important part.

I solved it, but it does not turn out the same way as the "screen.blit".
It can't display any transparency at all. It just skips the transparent pixels and show the solid ones, strange..

can someone plz say how i can get lua to read a random line from a txt file and print it to screen?

or show me how my code on the last page is wrong.

Mraellis, I can't tell you off the top of my head (I couldn't even write it out without a reference), but take a look at Snake (included in Luaplayer). It reads and writes from different lines of options.txt. I think the functions are called saveOptions() and loadOptions().

ok im using the 5 bullet code from evil mana and i have it set up so that when the bullet enter a certain are (hits the target) the score goes up by one
i have it working but the score continues to go up repeatedly unless i fire 5 bullets out of the zone. here is my code


if Wario[1].y + 72 > BulletInfo[i].y and BulletInfo[i].x + 8 > Wario[1].x and BulletInfo[i].x < Wario[1].x + 107 then
BulletInfo[i].firing = false
score = score + 1
end

please tell me what to do to make the score go up by JUST one not one repeated

Zitat:

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Zitat von jamz1825

ok im using the 5 bullet code from evil mana and i have it set up so that when the bullet enter a certain are (hits the target) the score goes up by one
i have it working but the score continues to go up repeatedly unless i fire 5 bullets out of the zone. here is my code


if Wario[1].y + 72 > BulletInfo[i].y and BulletInfo[i].x + 8 > Wario[1].x and BulletInfo[i].x < Wario[1].x + 107 then
BulletInfo[i].firing = false
score = score + 1
end

please tell me what to do to make the score go up by JUST one not one repeated

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the problem is, even after uve declared bullet firing to false, the x and y valuse retain their valuse. you need a bool:

Code:

---

hit = false

if Wario[1].y + 72 > BulletInfo[i].y and BulletInfo[i].x + 8 > Wario[1].x and BulletInfo[i].x < Wario[1].x + 107 then
BulletInfo[i].firing = false
hit = true
end

if hit == true then
score = score + 1
hit = false
end

---

try that

Why does everyone use Charlie's method? Sure its greats for begginers, but not when you go on to greater tasks. I mean his tutorials are for getting people started in lua, and provide a foundation. NOT provide a way you will use your whole career of lua

ive already tried that the score just continues to rise

EDIT: i double checked and tried urs, still no luck
-= Double Post =-
and bronx... about the getting started part...this is my first lua

Zitat:

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Zitat von Bronx

Why does everyone use Charlie's method? Sure its greats for begginers, but not when you go on to greater tasks. I mean his tutorials are for getting people started in lua, and provide a foundation. NOT provide a way you will use your whole career of lua

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whos charlie???

no worries i just got it, i had to move the coordinates of the bullet after it hit to a random spot that wouldnt make a difference

Oh, sorry dude... Continue on learning then :tup:

Charlie is the owner of Evilmana >.> (AKA PSPMillionare)

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Zitat von Bronx

Oh, sorry dude... Continue on learning then :tup:

Charlie is the owner of Evilmana >.> (AKA PSPMillionare)

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o his bullet code.. i see now. :tup:

thx aphonia, but the index.lua in snake goes on about strings and stuff i dont get in that bit >.<

i can wait till more program lua tuts come out as it might help me.

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Zitat von jamz1825

no worries i just got it, i had to move the coordinates of the bullet after it hit to a random spot that wouldnt make a difference

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That's an ugly fix... All you had to do was add an extra part to your if statement:

Code:

---

if (collision stuff) and BulletInfo[i].firing then
    BulletInfo[i].firing = false
    score = score + 1
end

---

Since the if statement will only trigger when firing == true and you immediately set it to false if it does trigger, than it will only run once.

Zitat:

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Zitat von LMelior

That's an ugly fix... All you had to do was add an extra part to your if statement:

Code:

---

if (collision stuff) and BulletInfo[i].firing then
    BulletInfo[i].firing = false
    score = score + 1
end

---

Since the if statement will only trigger when firing == true and you immediately set it to false if it does trigger, than it will only run once.

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we all got pwnt. :PC:

Zitat:

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Zitat von mraellis

can someone plz say how i can get lua to read a random line from a txt file and print it to screen?

or show me how my code on the last page is wrong.

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Check out the io.lines entry in the Lua Reference Manual. I've never had to do what you want before, but if I did then I would probably use that. I don't know if this will work or not, but I'd try this:

Code:

---

tableoflines={}
k=0
for line in io.lines("filename.txt") do
  k=k+1
  tableoflines[k]=line
end

randomline=tableoflines[math.random(k)]

---

No guarantees, of course. :)

ok, there could be a very simple answer to this but of coarse i dont know...i am jsut begining

andway
can you tell me how to make it so when i press start the game pauses and if i press it agin it resumes.

i know something exists like

system.sleep()

anyway could anyone help me out?

anyone?

i got it so i can pause but i haveto resume with another button
how could i do it with the smae button (start)

did you use this for the pause code?

Code:

---

--This goes somewhere near the start--
function pause()
while true do
pad:Controls.read()
screen:clear()
screen:print(200,200,"Game Paused",red)
if pad:start() and oldpad:start()~=pad:start() then
break
end
screen.waitVblankStart()
screen.flip()
end
end
--This goes in the main loop--
if pad:start() and oldpad:start()~=pad:start() then
pause()
end

---

thanks lmelior but that doesnt work :(
and that lua link is confusing.
i think i'll wait till a few more lua tuts for program luas out before i make something.

ok heres my problem i got my code pretty much sorted out but when i olay it the loading screen stays on 0% and then turns off my psp whats wrong anybody know?

Zitat:

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Zitat von %chrono trigger%

ok heres my problem i got my code pretty much sorted out but when i olay it the loading screen stays on 0% and then turns off my psp whats wrong anybody know?

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can we see your code?

its probably a loading problem.

nope didnt find it here is my code:
pink = Color.new(255, 0 , 153)
GameStatus = "Loading"
LoadingTimer = Timer.new()

LoadingTimer:start()

if GameStatus == "Loading" and LoadingTimer:time() >= 1 and LoadingTimer:time() < 50 then
screen:clear()
screen:print(194, 136, "Loading: 0%", pink)
screen.flip()
gunscreen = Image.load("gunscreen.jpg ")
end
if GameStatus == "Loading" and LoadingTimer:time() >= 50 and LoadingTimer:time() > 100 then
screen:clear()
screen:print(194, 136, "Loading: 20%", pink)
screen.flip()
gunman = Image.load("gunman.jpg")
end
if GameStatus == "Loading" and LoadingTimer:time() >= 100 and LoadingTimer:time() > 150 then
screen:clear()
screen:print(194, 136, "Loading: 40%", pink)
screen.flip()
background = Image.load("background.jp g")
end
if GameStatus == "Loading" and LoadingTimer:time() >= 150 and LoadingTimer:time() > 200 then
screen:clear()
screen:print(194, 136, "Loading: 60%", pink)
screen.flip()
playera = Image.load("playera.png")
end
if GameStatus == "Loading" and LoadingTimer:time() >= 200 and LoadingTimer:time() > 250 then
screen:clear()
screen:print(194, 136, "Loading: 80%", pink)
screen.flip()
playerb = Image.load("playerb.png")
end
if GameStatus == "Loading" and LoadingTimer:time() >= 250 and LoadingTimer:time() > 300 then
screen:clear()
screen:print(194, 136, "Loading: 90%", pink)
screen.flip()
end
if GameStatus == "Loading" and LoadingTimer:time() >= 300 and LoadingTimer:time() > 350 then
screen:clear()
screen:print(194, 136, "Loading: 100%", pink)
screen.flip()
end
if GameStatus == "Loading" and LoadingTimer:time() > 351 then
LoadingTimer:stop()
LoadingTimer:reset()
GameStatus = "Menu"
end
screen:blit(0,0,gunman)
screen.waitVblankStart(60 )
screen:clear()
screen.waitVblankStart(60 )
screen:clear()
screen:blit(0,0,backgroun d)
playera = {}
player[a] = {x = 200, y = 50}
playerb = {}
player[b] = { x = 400, y = 100 }
screenwidth = 480 - player.width()
screenheight = 272 - player.width()
player[b] = { x = 400, y = 100 }
screen:blit(Player [a].x,Player [a].y,playera)
screen:blit(Player[b].x,Player.y,playerb)
screenwidth = 480 - player.width()
screenheight = 272 - player.width()
Playerb = { x = 400, y = 100 }
if pad:left() and Player[1].x > 0 then
Player[1].x = Player[1].x - 2
end
if pad:right() and Player[1].x < screenwidth then
Player[1].x = Player[1].x + 2
end
if pad:up() and Player[1].y > 0 then
Player[1].y = Player[1].y - 2
end
if pad:down() and Player[1].y < screenheight then
Player[1].y = Player[1].y + 2
end
screen.waitVblankStart()
screen.flip()

Zitat:

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Zitat von Bronx

Why does everyone use Charlie's method? Sure its greats for begginers, but not when you go on to greater tasks. I mean his tutorials are for getting people started in lua, and provide a foundation. NOT provide a way you will use your whole career of lua

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But why use Lua for "your whole career" when you have C++?


@ Chrono, i think that would load the image into memory over and over again realy quickly, crashing the PSP.

Use

Code:

---

if loading step = 1

IF background (or whatever image) = null

//* Print text saying 20% done or whatever

//* Load Background image...

END

else

load = 2

END

END

---

That was terrible i dont even know if there is a ELSE function in Lua.

Wait, i dont know Lua at all! But anyway what you want done can be acomplished with Null.

So

Code:

---


IF Background = null

---

is

Code:

---


If the memory at the address background is empty then.

---

or

Code:

---


if background is empty then.

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where do i put the IF Background = null?
and what does the code do? (so im not just coping and pasting)

I explained it at the bottom. DONT copy that code, i dont know lua, it wont work. It was just theory code.

IF background = null will check to see if there is no image in background.

Soo take out the timer and put that there instead. The timer is what is crashing the PSP.

Ergh ive explained this terribly...