Lua Programming Help Thread

[TacticalPenguin]

System.usbDiskModeActivat e() -- You should make this activated by a button

usb = 0 
if Controls.read():l() and usb == 0 then
System.USBDiskModeActivate()
usb = 1
end
if Controls.read():l() and usb == 1 then
System.USBDiskModeDeactivate()
usb = 0
end

white = Color.new(255, 255, 255) --You never even use this, so get rid of it

background = Image.load("images/menu.png")
November = Image.load("images/nov.png")
December = Image.load("images/dec.png")
January = Image.load("images/jan.png")
Febuary = Image.load("images/feb.png")
March = Image.load("images/mar.png")
April = Image.load("images/apr.png")
May = Image.load("images/may.png")
June = Image.load("images/june.png")
July = Image.load("images/july.png")
August = Image.load("images/aug.png")
September = Image.load("images/sept.png")-- I assume you'll use these later

--You need to make your code into a main loop

while true do
screen:blit(0, 0, background)--You dont need to put false, only true if you want it true
screen.waitVblankStart()
screen.flip()
end -- You need to end it

That code will make it blit the background and make l toggle USB. To disply the month images:
screen:blit(x,y,nameofamo nth) -- Place that in your main loop AFTER you blit the background

[MSeven]

i need help with my new program
it isnt loading the images it keeps coming up with an eror what am i doing wrong

for one thing, there is a space at the end of the ACTIVAT_E take it out, second put the images in the same folder as the index.lua and take out the "images/" from code and
while true do
screen:blit(0, 0, background)
screen.waitVblankStart()
screen.flip()
end
you need to add that

[TacticalPenguin]

Images dont need to be in the same directory. Putting them in direcxtories organizes them.

[SG57]

Says you ;)

[Anti-QuickJay]

It really doesent matter where you put the images, AAs long as they load.

[GuitarGod1134]

You have to use the oldpad method.

if pad:r() and oldpad:r() ~= pad:r() then
computer = math.random(3,5)
end

Where would i put oldpad = pad or whatever. would i put that next under

pad = Controls.read()

or after

if pad:r() and oldpad:r() ~= pad:r() then
computer = math.random(3,5)

???

OK getting really mad over here REALLY MAD.
ok first i still have the question above my really mad sentence and i have another problem.
in lua player my menu is named index.lua and the other things are the pics and multiplayer.lua and singleplayer.lua now it clearly says index.lua and lua player is supposed to run that but it goes straight to my multiplayer.lua file instead WTF. ive tried changing directories and everything but its being a little B*** is there a function or something im missing?

EDIT: still not working i delclared oldpad = Controls.read() outside of the main loop and it still didnt work.

[MSeven]

i made a bullet collision so when my plane shoots the enemy plane, the enemy plane turns into a fireball untill it goes off the screen and turns back to a plane again so i did this

if spot1.x>=470 then
obst1 = Image.load("enemy1.png")
end

if spot2.x>=470 then
obst2 = Image.load("enemy2.png")
end

if spot3.x>=470 then
obst3 = Image.load("enemy3.png")
end

if spot4.x>=470 then
obst4 = Image.load("enemy4.png")
end

but the problem is when it loads the image again, the game lags, but it loads every like second or so, so the game is becoming lag fiesta
-= Double Post =-
nevermind problem solved

[HeaD_ShOt]

how do u make a program a loop

System.usbDiskModeActivat e()

white = Color.new(255, 255, 255)
black = Color.new(0, 0, 0)

screenrint(194, 136, ".......LOADING, PLEASE WAIT.......", black)
screen.flip()

background = Image.load("menu.png")
November = Image.load("nov.png")
December = Image.load("dec.png")
January = Image.load("jan.png")
Febuary = Image.load("feb.png")
March = Image.load("mar.png")
April = Image.load("apr.png")
May = Image.load("may.png")
June = Image.load("june.png")
July = Image.load("july.png")
August = Image.load("aug.png")
September = Image.load("sept.png")
screen:clear()

while true do
screen:blit(0, 0, background)
screen.waitVblankStart()
screen.flip()
end

pad = Controls.read()

screenrint(5, 261, "controls", white)
screenrint(5, 251, "press left arrow for november", white)
screenrint(5, 241, "press right arrow for december", white)
screenrint(5, 231, "press up arrow for january", white)
screenrint(5, 221, "press down arrow for febuary", white)
screenrint(5, 211, "press x for march", white)
screenrint(5, 201, "press 0 for april", white)
screenrint(5, 191, "press [] for may", white)
screenrint(5, 181, "press ^ for june", white)
screenrint(5, 171, "press R for july", white)
screenrint(5, 161, "press L for august", white)
screenrint(5, 151, "press 'select' to take a screenshot", white)
screenrint(5, 141, "press 'start' to restart", white)
screen.flip()

if pad:left() then
screen:blit(0, 0, November, false)
screen.flip()
end

if pad:right() then
screen:blit(0, 0, December, false)
screen.flip()
end

if pad:up() then
screen:blit(0, 0, January, false)
screen.flip()
end

if pad:down() then
screen:blit(0, 0, Febuary, false)
screen.flip()
end

if pad:cross() then
screen:blit(0, 0, March, false)
screen.flip()
end

if pad:circle() then
screen:blit(0, 0, April, false)
screen:flip()
end

if pad:square() then
scree:blit(0, 0, May, false)
screen:flip()
end

if pad:triangle() then
screen:blit(0, 0, June, false)
screen:flip()
end

if pad:r() then
screen:blit(0, 0, July, false)
screen:flip()
end

if pad:l() then
screen:blit(0, 0, August, false)
screen:flip()
end

if pad:select() then screen:save("screenshot.t ga") end

if pad:start() then
break
end

all those happy faces were supposed to be "p"s

[PSPgamer512]

What exactly are you making? An image loader that shows the background that your PSP has each month?

Anyway...


while true do
screen:blit(0, 0, background)
screen.waitVblankStart()
screen.flip()
end

pad = Controls.read()

That, in bold, is not needed(to my knowledge)
Try this:

while true do
screen:blit(0, 0, background)
pad = Controls.read()


Oh, and at the end:

if pad:start() then
break
end

You need to add another end at the end so it should look like this:

if pad:start() then
break
end

end

[Grimfate126]

It really doesent matter where you put the images, AAs long as they load.

actually, when you load an image, luaplayer (or C/C++) searches for the image in the directory specified, so having a lot of images could slow the loading time. not too significant though

[Access_Denied]

Where would i put oldpad = pad or whatever. would i put that next under

pad = Controls.read()

or after

if pad:r() and oldpad:r() ~= pad:r() then
computer = math.random(3,5)

???

OK getting really mad over here REALLY MAD.
ok first i still have the question above my really mad sentence and i have another problem.
in lua player my menu is named index.lua and the other things are the pics and multiplayer.lua and singleplayer.lua now it clearly says index.lua and lua player is supposed to run that but it goes straight to my multiplayer.lua file instead WTF. ive tried changing directories and everything but its being a little B*** is there a function or something im missing?

EDIT: still not working i delclared oldpad = Controls.read() outside of the main loop and it still didnt work.

First of all, for the LuaPlayer things. It doesn't run what the program is named. So if it's named index.lua, it could still run script.lua. You have to edit the .bat file to your script name. And second, here's how the oldpad thing goes:

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

code
code
screen.waitVblankStart()
screen.flip()
oldpad = pad
end

[PSPgamer512]

Alright, I need help on getting my bomb to drop. I've searched for answers but have received nothing. So I need to know how to make my bomb move from the top of the screen to the spot where i want it to move. Its been bugging me b/c i cannot figure out how to do it....Help please.

[SG57]

Uh, blit it where you want on the screen *rolls eyes*

[PSPgamer512]

No, I want animation of the bomb droping

[Access_Denied]

while true do
screen:clear()
screen:blit(bomb.x,bomb.y ,bomb)
bomb.y = bomb.y -2

[PSPgamer512]

Its not working

[emericaska8r]

I was looking before, and i dunno if you got it already, but to load an image you need the .\ thingy. ex.

July = Image.load("./Images/July.png")

[Access_Denied]

I was looking before, and i dunno if you got it already, but to load an image you need the .\ thingy. ex.

July = Image.load("./Images/July.png")

No you don't this will do fine:

July = Image.load("Images/July.png")

[HeaD_ShOt]

Is there any way to make it load alot of photos?
because i have like 12 photos loading and it always comes up with an error
but when i limit the number of photos it works fine

[Grimfate126]

Is there any way to make it load alot of photos?
because i have like 12 photos loading and it always comes up with an error
but when i limit the number of photos it works fine

luaplayer only has like 3mb of ram, and each picture takes up like 500k (some less, some more). so yeah, if you want more, C/C++ will work.

[Access_Denied]

Is there any way to make it load alot of photos?
because i have like 12 photos loading and it always comes up with an error
but when i limit the number of photos it works fine

Here's a small example, but you must name them like this:

photo = {}
photo[1] = "Images/Janruary.png"
photo[2] = "Images/February.png"
etc.
etc.

//insert your image table from above here//
current = 1
image = nil
while true do
screen:clear()
image = Image.load(photo[current])
screen:blit(0,0,image)
screen.waitVblankStart()
screen.flip()
end

In this code, if you change the value of 'current', it will load the image in the table with that number.

[HeaD_ShOt]

i used 30 kb images though...
the entire program is 500kb

[Access_Denied]

i used 30 kb images though...
the entire program is 500kb

It doesn't matter. The PSP loads them in RAW format. A 1kb picture will take up the same amount of RAM as a 1MB picture.

[GuitarGod1134]

First of all, for the LuaPlayer things. It doesn't run what the program is named. So if it's named index.lua, it could still run script.lua. You have to edit the .bat file to your script name. And second, here's how the oldpad thing goes:

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

code
code
screen.waitVblankStart()
screen.flip()
oldpad = pad
end

Thanks man Im gonna try that.
Well my parents just took away my psp so i cant work out the bugs or anything on my game so if someone could pm me or something and beta it ill send u the source and the pics and if u get an error keep telling me what error u get. if anyone could do that that would be a big help and i would put u in the heylookatme.txt file in the credits. u need a yahoo messanger mine is
[email protected]
and the yahoo screen name is
douchberry

[Blackbelttcon]

hey when i run my game it comes up loop is gettable what is that and how do i fix it.

[GuitarGod1134]

Loop is gettable? that doesnt even make sence

[Blackbelttcon]

thats wut comes up
index.lua:3: loop in gettable
press start to restart

[Grimfate126]

thats wut comes up
index.lua:3: loop in gettable
press start to restart

loop in gettable is kinda like a free card. it can be a wide wariety of things. we'll need to see your code.

[Blackbelttcon]

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

player = Image.c13(32,32)
player.clear(blue)
Player = { x = 30, y = 100 }


dofile("./police circle.lua")

function movePlayer()
pad = Controls.read()
if pad:right() then
Player.y = Player.y + 5
end
if pad:left() then
Player.y = Player.y - 5
end
if pad:down() then
Player.x = Player.x + 5
end
if pad:up() then
Player.x = Player.x - 5
end
end


while true do

screen:clear()

movePlayer()


screen:blit(Player.y,Play er.x,player)

screen.waitVblankStart()
screen.flip()
end
-= Double Post =-
then the cop circle is

green = Color.new(0, 200, 0)
blockImage = Image.cop(64,39)

blockImage:clear(green)

block = { x = 10, y = 100 }

radius = 100
speed = 5

xcenter = 240

ycenter = 135

degree = 0
radian = 0

while true do
screen:clear()

degree = degree + speed
radian = (degree/180)*math.pi
block.x = xcenter+math.cos(radian)* radius
block.y = ycenter-math.sin(radian)*radius

screen:blit(block.x,block .y,blockImage)

screen.waitVblankStart()
screen.flip()
end
end

[Access_Denied]

I'm assuming this:

player = Image.c13(32,32)
player.clear(blue)

should be this:

player = Image.createEmpty(32,32)
player:clear(blue)