Lua Programming Help Thread

[TPTaylor]

When you want the music to stop, put Music.Stop() . If you want it to stop in a different script, put it at the top outside the loop.
or at the top of your script you can change the:
music = Music.PlayFile("music.it" )
to:
music = Music.PlayFile("music.it" , false)

[madsoul]

ok, but now when i try to start the game it gives me this message:

error: SCRIPT.LUA:47: error loading sound
Error: No script found.

[TPTaylor]

Could you perhaps attatch the script file?

[madsoul]

yeas! it works now!! great! now i only need to make some images! im very soon finnished with my own lua game!!!!

[madsoul]

how do i make this image trasparent?



im mean so the black around it disepear when i play the game.

[TPTaylor]

Can't you photoshop the black bit out?
If you don't have photoshop i believe GIMP is a good program.

[Vaza]

how do i make this image trasparent?



im mean so the black around it disepear when i play the game.

how can you make all those fakes and not know how to make a image transparent!!!

[mark.sparky]

ok im a n00b at lua and when i play this it stops straight waway i know it is something to do with the loop but could someone tell me what it is because i have no clue

-- Green Color Object
green = Color.new(0, 255, 0)
-- Store birth year in varible myBirthYear
myBirthYear = 1986
-- Store current year in currentYear
currentYear = 2006
-- create an empty varible
myAge = nil
-- Store some text in a varible
someText = "My age is roughly "
-- Subtract myBirthYear from cureentYear and store inmyAge
myAge = currentYear - my BirthYear
-- Print my text varible to the screen
screen:print(10, 100, someText .. myAge,green)
-- Buffer offscreen to onscreen
screen.flip()
--Loop forever
while true do
screen.waitVblankStart()
end

the p is in bold becuase if it was not it would look like this

[Mast3r_Shak3]

How would I make something (a spike specifically) fall down the screen?

[kozine]

Try this:

pic= image.load('whatever')
picx=400
picy=0


while true do
screen.blit(picx,picy,pic  ,0,0,pic:width(),pic:heig  ht())

if picy+pic:height()<260 then      (if the ground starts at 260 that is)
picy=picy-10      
end

if picy+pic:height()>260 then
picy=260-pic:height()
end

if picy +pic:height()==260
picx=picx-5
end

end

[Mast3r_Shak3]

Hm, okay after changing filenams around and bliting a white background it loads but no spike...

[kozine]

hmm. Post your code plz.

[c5cha7]

ok im a n00b at lua and when i play this it stops straight waway i know it is something to do with the loop but could someone tell me what it is because i have no clue

the p is in bold becuase if it was not it would look like this

try this:
-- Green Color Object
green = Color.new(0, 255, 0)
-- Store birth year in varible myBirthYear
myBirthYear = 1986
-- Store current year in currentYear
currentYear = 2006
-- create an empty varible
myAge = nil
-- Store some text in a varible
someText = "My age is roughly "
-- Subtract myBirthYear from cureentYear and store inmyAge
myAge = currentYear - my BirthYear
-- Print my text varible to the screen
-- Buffer offscreen to onscreen
screen.flip()
--Loop forever
while true do
screen:print(10, 100, someText .. myAge,green)
screen.waitVblankStart()
screen:flip()
end

[Mast3r_Shak3]

K. All I changed was the "pic" text and added a white background. (if ur talking about the code to the game I dont have it because im totally rewriting the code)

spike = Image.load("spike.png")
background = Image.load("background.png")
spikex = 400
spikey = 0
 

while true do
screen:blit(0,0, background, false)
screen:blit(spikex, spikey, spike, 0, 0, spike:width(), spike:height())

if spikey + spike:height() < 260 then
spikey = spikey-10      
end

if spikey + spike:height() > 260 then
spikey = 260 - spike:height()
end

if spikey + spike:height() == 260 then
spikex = spikex-5
end

screen.flip()
screen.waitVblankStart()
end

[c5cha7]

K. All I changed was the "pic" text and added a white background. (if ur talking about the code to the game I dont have it because im totally rewriting the code)

spike = Image.load("spike.png")
background = Image.load("background.png")
spikex = 400
spikey = 0
 

while true do
screen:blit(0,0, background, false)
screen:blit(spikex, spikey, spike, 0, 0, spike:width(), spike:height())

if spikey + spike:height() < 260 then
spikey = spikey-10      
end

if spikey + spike:height() > 260 then
spikey = 260 - spike:height()
end

if spikey + spike:height() == 260 then
spikex = spikex-5
end

screen.flip()
screen.waitVblankStart()
end

Whats the problem/error you get?
and maybe i can help yas :icon_bigg .

[Rakath]

Okay, im attempting to make my first ever lua game. Ive been doing lua for roughly three days and ive grasped most of it. I wanted to do a shooter and gutya(great guy) has been aiding me. Fair enough, its an in depth first project, but i wanted to try.
So i used evil manas snippets and attempted to merge them together, to get a moving shooting character.
But at the moment ive fixed a few errors but then This comes up
" Error: index.lua:29: attempt to index field '?' <a nil value>
Id appreciate someone helping me out with this code, as i dont understand parts of it myself. After this error im sure there will be more.

--Activiate usb
System.usbDiskModeActivate()
--generating colours
red = Color.new(255,0,0)
black = Color.new(0,0,0)
green=Color.new(0,255,0)
white = Color.new(255,255,255)
--Create shapes
player1 = Image.createEmpty(32,32)
player1:clear(red)
ground = Image.createEmpty(480,10)
ground:clear(green)
bullet = Image.createEmpty(4,4)
bullet:clear(green)
--variables
oldpad = Controls.read()
currentBullet = 0
direction = "right"
--Arrays
player = {}
player.gravity = 230
player.y = 230
player.x = 50
player.jumpspeed = 10
player.jumpstate = "ground"
--bullet array
BulletInfo = {}
for a = 1,5 do
BulletInfo[a] = { pic = bullet , firing = false, direction = "right", x = player[1].x + 32, 
y = player[1].y + 16 }
end

--Functions

function bulletSetup()
--Increase the current bullet by one, or reset it to 1
if currentBullet < 5 then
currentBullet = currentBullet + 1
else
currentBullet = 1
end
if direction == "left" then 
BulletInfo[currentBullet].x = Player[1].x 
BulletInfo[currentBullet].y = Player[1].y + 16
end
if direction == "right" then 
BulletInfo[currentBullet].x = Player[1].x + 32 
BulletInfo[currentBullet].y = Player[1].y + 16 
end
if direction == "up" then 
BulletInfo[currentBullet].x = Player[1].x + 16 
BulletInfo[currentBullet].y = Player[1].y 
end
if direction == "down" then 
BulletInfo[currentBullet].x = Player[1].x + 16
BulletInfo[currentBullet].y = Player[1].y + 32 
end

BulletInfo[currentBullet].direction = direction
BulletInfo[currentBullet].firing = true
end
function bulletFire()
for i = 1,5 do
if BulletInfo[i].firing == true then
if BulletInfo[i].direction == "right" then BulletInfo[i].x = BulletInfo[i].x + 10 end
if BulletInfo[i].direction == "left" then BulletInfo[i].x = BulletInfo[i].x - 10 end
if BulletInfo[i].direction == "up" then BulletInfo[i].y = BulletInfo[i].y - 10 end
if BulletInfo[i].direction == "down" then BulletInfo[i].y = BulletInfo[i].y + 10 end
screen:blit(BulletInfo[i].x,BulletInfo[i].y,BulletInfo[i].pic)
end
if BulletInfo[i].x < 0 or BulletInfo[i].x > 480 or BulletInfo[i].y < 0 or BulletInfo[i].y > 272 then BulletInfo[i].firing = false end
end
end
--Print bullet info to screen.
screen:print(10,10,"Bullet 1: ".. tostring(BulletInfo[1].firing),green)
screen:print(10,20,"Bullet 2: "..tostring(BulletInfo[2].firing),green)
screen:print(10,30,"Bullet 3: "..tostring(BulletInfo[3].firing),green)
screen:print(10,40,"Bullet 4: "..tostring(BulletInfo[4].firing),green)
screen:print(10,50,"Bullet 5: "..tostring(BulletInfo[5].firing),green)
screen:print(10,60,"Direction: "..direction,green)

--mainloop
while true do
pad = Controls.read()
screen:clear()
if pad:start() then
break
end

if pad:left() then 
player.x = player.x - 2
end
if pad:right() then
player.x = player.x + 2
end
if pad:cross() and player.jumpstate == "ground" then player.jumpstate = "jumping" end 
if player.jumpstate == "jumping" then 
player.jumpspeed = player.jumpspeed - 0.5
player.gravity = player.gravity - player.jumpspeed 
end
if player.gravity < 0 then 
player.jumpstate = "falling"
end
if player.gravity < 230 and player.jumpstate == "falling" then 
player.gravity = player.gravity + (player.jumpspeed + 3) 
end
if player.gravity == 230 then 
player.jumpspeed = 10
player.jumpstate = "ground"
end

if player.gravity > 230 then player.gravity = 230 end
player.y = player.gravity
screen:blit(player.x,player.y,player1)
screen:blit(0,262,ground)

screen:print(10,10,"X: "..player.x.." Y: "..player.y,green)
screen:print(10,20,"Jumpstate: "..player.jumpstate,green)

screen.waitVblankStart()
screen.flip()
end 
if pad:cross() and oldpad:cross() ~= pad:cross() then
bulletSetup()
end
bulletFire()

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

[Mast3r_Shak3]

Whats the problem/error you get?
and maybe i can help yas :icon_bigg .

Thats just some test code to make an image fall down th screen. when i test. only the background is blited

[q_dmc12]

Hey, i hate to sound like a total n00b but how would i get lua player running on the gta eloader, for some reason it wont work (v0.14) - thx. :Argh: :o

[Greenskull]

I am very confused about this "oldpad" thing. How do you make it so when you press X it starts and when you press it again it stops etc.?

anyone?

[Greenskull]

I cant figure out how to loop an animation. help please!

[shadow-evillink]

Is there a gravity code for lua example:

a ball that goes up at 10 velocity and starts to slow down ,when it reaches zero it starts to go down and speeds up.

[califrag]

Is there a gravity code for lua example:

a ball that goes up at 10 velocity and starts to slow down ,when it reaches zero it starts to go down and speeds up.

you should just develop a code yourself so you can customize it the way you want...

http://www.google.com/search?hl=en&l...th%27s+gravity

http://www.evilmana.com/tutorials/lu...et_jumping.php

but that should get you started! ;D

[Mast3r_Shak3]

Gah, I still need help making objects fall down the screen

[califrag]

Gah, I still need help making objects fall down the screen

Download the attached file!

I used a 10x10 image which will fall from a random x location from the top of the screen to the bottom. Press X to pause the spike MID-AIR ;P


HTH

[Greenskull]

can someone give me an example animation? How do i make it so when you press X, it starts, looping forever, and when you press X it stops. Then when you press X again it starts again and so on.

[Mast3r_Shak3]

Download the attached file!

I used a 10x10 image which will fall from a random x location from the top of the screen to the bottom. Press X to pause the spike MID-AIR ;P


HTH

THANK YOU! *bows*

[Rixorster]

Humm, how can i make an scrolling screen? (like when you go forward it scrolls with you and if theres objects like then they move/appear too :P)
(making smw game :P )
And also, how can i create a menu with mouse arrow replaced with an hand icon thingy, and also, if i click x while the arrow/hand is over the button, it does some function and menu dissapears(and goes to game of course :P )?

[califrag]

can someone give me an example animation? How do i make it so when you press X, it starts, looping forever, and when you press X it stops. Then when you press X again it starts again and so on.

click "search this thread"

[Mast3r_Shak3]

How would I have a function loop forever?

[Mast3r_Shak3]

Okay this is pissing me off... I test the script in luaplayerwindows and nothing happens. It starts but its just a black screen...