Lua Programming Help Thread

[TeamOverload]

Why are you having the vertical value increase when you press right? You should be increasing the x value

[Glynnder]

yea - but you can still use the letter y althugh it gets confusign, you just have to say (y, 100, ....)
but i would use X

TO - I really think people should use the devs one more, then we will be asking harder q's eh?

[TeamOverload]

Ya, but Im just saying its just easier to put (x, 25, ...) and then have x = x +5 when you press right

[Glynnder]

ya I know, hey TO, what are you currently working on?

[TeamOverload]

Check the sig....im about to get back to work on Tux Rampage, as I have a backup of that project, so I can continue where I left off

[ct-boy]

could someone help me every time I load my lua thingy it gets to loading 90% but then my psp takes me back to eloader screen someone help me heres my code:

pink = Color.new(255, 0 , 153)
blue = Color.new(0 , 153, 255)
orange = Color.new(255, 102, 0)
gray = Color.new(153, 153, 153)
black = Color.new(0 , 0 , 0) 

screen:print(194, 136, "Loading: 0%", pink)
screen.flip()

background = Image.load("images/background.jpg")

screen:clear()
screen:print(194, 136, "Loading: 20%", pink)
screen.flip()

circle = Image.load("images/buttons/circle_button.png")
down = Image.load("images/buttons/down_arrow.png")

screen:clear()
screen:print(194, 136, "Loading: 40%", pink)
screen.flip()

l = Image.load("images/buttons/left_trigger.png")
left = Image.load("images/buttons/left_arrow.png")

screen:clear()
screen:print(194, 136, "Loading: 60%", pink)
screen.flip()

r = Image.load("images/buttons/right_trigger.png")
right = Image.load("images/buttons/right_arrow.png")
boltsnd = Sound.load("music/comp.wav")

screen:clear()
screen:print(194, 136, "Loading: 80%", pink)
screen.flip()

square = Image.load("images/buttons/square_button.png")
triangle = Image.load("images/buttons/triangle_button.png")

screen:clear()
screen:print(194, 136, "Loading: 90%", pink)
screen.flip()

up = Image.load("images/buttons/up_arrow.png")
x = Image.load("images/buttons/cross_button.png")
splash = Image.load("images/lua.gif")

screen:clear()
screen:print(194, 136, "Loading: 100%", pink)
screen.flip()
screen.waitVblankStart(60)

screen:blit(0, 0, splash, false)
screen.waitVblankStart()
screen.flip() 

boltsnd:play()
screen.waitVblankStart(240)
Music.volume(128)

while true do
          screen:blit(0, 0, background, false)

pad = Controls.read()

          screen:print(135, 251, "Press 'Start' to restart", blue)
          screen:print(110, 261, "Press 'Select' for a screenshot", blue)
          screen:print(383, 35, "Support:", black)
          screen:print(365, 45, "PS3Lounge.net", orange)
          screen:print(365, 55, "scriptscribbler.com/psp", gray)
          screen.flip()

if pad:cross() then
                    screen:blit(50, 228, x)
                    screen.flip()
          end 

if pad:circle() then
                    screen:blit(90, 195, circle)
                    screen.flip()
          end

          if pad:triangle() then
                    screen:blit(45, 165, triangle)
                    screen.flip()
          end

          if pad:square() then
                    screen:blit(15, 195, square)
                    screen.flip()
          end

          if pad:up() then
                    screen:blit(60, 40, up)
                    screen.flip()
          end

          if pad:right() then
                    screen:blit(90, 65, right)
                    screen.flip()
          end

          if pad:down() then
                    screen:blit(60, 80, down)
                    screen.flip()
          end

          if pad:left() then
                    screen:blit(30, 65, left)
                    screen.flip()
          end

          if pad:l() then
                    screen:blit(4, 6, l)
                    screen.flip()
          end

          if pad:r() then
                    screen:blit(403, 4, r)
                    screen.flip()
          end 

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

         if pad:start() then
                    break
          end

end

[kozine]

Try this:

pink = Color.new(255, 0 , 153)
blue = Color.new(0 , 153, 255)
orange = Color.new(255, 102, 0)
gray = Color.new(153, 153, 153)
black = Color.new(0 , 0 , 0) 

background = Image.load("images/background.jpg")
circle = Image.load("images/buttons/circle_button.png")
down = Image.load("images/buttons/down_arrow.png")
l = Image.load("images/buttons/left_trigger.png")
left = Image.load("images/buttons/left_arrow.png")
r = Image.load("images/buttons/right_trigger.png")
right = Image.load("images/buttons/right_arrow.png")
square = Image.load("images/buttons/square_button.png")
triangle = Image.load("images/buttons/triangle_button.png")
up = Image.load("images/buttons/up_arrow.png")
x = Image.load("images/buttons/cross_button.png")
splash = Image.load("images/lua.gif")

boltsnd = Sound.load("music/comp.wav")


screen:print(194, 136, "Loading: 0%", pink)
screen.flip()



screen:clear()
screen:print(194, 136, "Loading: 20%", pink)
screen.flip()


screen:clear()
screen:print(194, 136, "Loading: 40%", pink)
screen.flip()


screen:clear()
screen:print(194, 136, "Loading: 60%", pink)
screen.flip()



screen:clear()
screen:print(194, 136, "Loading: 80%", pink)
screen.flip()

screen:clear()
screen:print(194, 136, "Loading: 90%", pink)
screen.flip()


screen:clear()
screen:print(194, 136, "Loading: 100%", pink)
screen.flip()
screen.waitVblankStart(60  )

screen:blit(0, 0, splash, false)
screen.waitVblankStart()
screen.flip() 

boltsnd:play()
screen.waitVblankStart(24  0)
Music.volume(128)

while true do
          screen:blit(0, 0, background, false)

pad = Controls.read()

          screen:print(135, 251, "Press 'Start' to restart", blue)
          screen:print(110, 261, "Press 'Select' for a screenshot", blue)
          screen:print(383, 35, "Support:", black)
          screen:print(365, 45, "PS3Lounge.net", orange)
          screen:print(365, 55, "scriptscribbler.com/psp", gray)
          screen.flip()

if pad:cross() then
                    screen:blit(50, 228, x)
                    screen.flip()
          end 

if pad:circle() then
                    screen:blit(90, 195, circle)
                    screen.flip()
          end

          if pad:triangle() then
                    screen:blit(45, 165, triangle)
                    screen.flip()
          end

          if pad:square() then
                    screen:blit(15, 195, square)
                    screen.flip()
          end

          if pad:up() then
                    screen:blit(60, 40, up)
                    screen.flip()
          end

          if pad:right() then
                    screen:blit(90, 65, right)
                    screen.flip()
          end

          if pad:down() then
                    screen:blit(60, 80, down)
                    screen.flip()
          end

          if pad:left() then
                    screen:blit(30, 65, left)
                    screen.flip()
          end

          if pad:l() then
                    screen:blit(4, 6, l)
                    screen.flip()
          end

          if pad:r() then
                    screen:blit(403, 4, r)
                    screen.flip()
          end 

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

         if pad:start() then
                    break
          end

end

[PopcOrn DeVil]

How big can your .wav files be? Because I'm trying to use some for music but just by going songlay() (song is my song variable).

[FLai]

i think they can be as big as you want them to be. try it. i am not too sure. if not, edit it down a bit

[kozine]

I am so stuck on these tile backgrounds. Its really annoying me also.

--Load images
tiles = Image.load("images/specialtiles.png")

-- the map
map1 = {
	"dkkkkkkkkfaaaaaaaaaaaaaaa",
	"ibgbgbbgbjaaaaaaaaaaaaaaa",
	"ibgbgbbgbjaaaaaaaaaaaaaaa",
	"ibgbgbbgbjaaaaaaaaaaaaaaa",
	"ibgbgbbgbjaaaaaaaaaaaaaaa",
	"ibgbgbbgbjaaaaaaaaaaaaaaa",
	"hlllllllleaaaaaaaacpaaaaa",
	"aaaaaaaaaaaaaaaaaanoaaaaa",
	"aaaaaaaaaaaaaaaaaaaaaaaaa",
	"aaaaaaaaaaaaaaaaaaaaaaaaa",
	"aaaaaaaaaaaaaaaaaaaaaaaaa",
	"aaaaaaaaaaaaaaaaaaaaaaaaa",
	"aaaaaaaaaaaaaaaaaaaaaaaaa",
	"aaaaaaaaaaaaaaaaaaaaaaaaa",
	"aaaaaaaaaaaaaaaaaaaaaaaaa",
	"aaaaaaaaaaaaaaaaaaaaaaaaa",
	"aaaaaaaaaaaaaaaaaaaaaaaaa"
}

function drawTile(tile, x, y)
	local tileX = math.mod(tile, 4)
	local tileY = math.floor(tile / 4)
	screen:blit(16 * x, 16 * y, tiles, 17 * tileX + 1, 17 * tileY + 1, 16, 16, false)
end

while true do

for y = 1, 17 do
		line = map1[y]
		for x = 1, 30 do
			tile = string.byte(line, x) - string.byte("a")
			drawTile(tile, x - 1, y - 1)
		end
	end

screen.flip()
end

Error:

error: game.lua:40: attempt to perform arithmetic on a nil value

Please help!

[TPTaylor]

Music files like wav's can't be that big. It is better to use MOD format or IT, or anything which uses modules, rather than a waveform. Also, loading times are affected if you try and load like 5 5mb song wavs.
I would have thought though if you have to do it, maybe 2mb each. no longer than 30 seconds.

[Andrey]

Why are you having the vertical value increase when you press right? You should be increasing the x value

Allright, changed it, but that didn't really change anything, the char image still does not move.


white = Color.new(255, 255, 255)
char = Image.load("char.png")
x = 150

screenrint(100, 100, "loading finished", white)
screen.flip()
screen.waitVblankStart(24 0)
screen:clear()

screen:blit(x, 50, char)
screen.flip()

pad = Controls.read()

if pad:right() then
x = x + 5
end

while true do
screen.waitVblankStart()
screen.flip()

end

[kozine]

white = Color.new(255, 255, 255)
char = Image.load("char.png")
x = 150

screenrint(100, 100, "loading finished", white)
screen.flip()
screen.waitVblankStart(24 0)
screen:clear()

screen:blit(x, 50, char)
screen.flip()

pad = Controls.read()

if pad:right() then
x = x + 5
end

while true do

pad = Controls.read()
screen:blit(x, 50, char)
screen.flip()

pad = Controls.read()

if pad:right() then
x = x + 5
end
screen.waitVblankStart()
screen.flip()

end

Try that m8!

[Andrey]

Ha, it works, thanks a ton!

[Altair]

@ct-boy

If it stops at 90% it means there is something wrong between 90% and 100%. Just so you know for the future. I think people forget that, maybe im wrong. So anyway, Lua cant handle GIF's (yet), so change that in your code.

[Altair]

I am so stuck on these tile backgrounds. Its really annoying me also.

--Load images
tiles = Image.load("images/specialtiles.png")

-- the map
map1 = {
	"dkkkkkkkkfaaaaaaaaaaaaaaa",
	"ibgbgbbgbjaaaaaaaaaaaaaaa",
	"ibgbgbbgbjaaaaaaaaaaaaaaa",
	"ibgbgbbgbjaaaaaaaaaaaaaaa",
	"ibgbgbbgbjaaaaaaaaaaaaaaa",
	"ibgbgbbgbjaaaaaaaaaaaaaaa",
	"hlllllllleaaaaaaaacpaaaaa",
	"aaaaaaaaaaaaaaaaaanoaaaaa",
	"aaaaaaaaaaaaaaaaaaaaaaaaa",
	"aaaaaaaaaaaaaaaaaaaaaaaaa",
	"aaaaaaaaaaaaaaaaaaaaaaaaa",
	"aaaaaaaaaaaaaaaaaaaaaaaaa",
	"aaaaaaaaaaaaaaaaaaaaaaaaa",
	"aaaaaaaaaaaaaaaaaaaaaaaaa",
	"aaaaaaaaaaaaaaaaaaaaaaaaa",
	"aaaaaaaaaaaaaaaaaaaaaaaaa",
	"aaaaaaaaaaaaaaaaaaaaaaaaa"
}

function drawTile(tile, x, y)
	local tileX = math.mod(tile, 4)
	local tileY = math.floor(tile / 4)
	screen:blit(16 * x, 16 * y, tiles, 17 * tileX + 1, 17 * tileY + 1, 16, 16, false)
end

while true do

for y = 1, 17 do
		line = map1[y]
		for x = 1, 30 do
			tile = string.byte(line, x) - string.byte("a")
			drawTile(tile, x - 1, y - 1)
		end
	end

screen.flip()
end

Error:

error: game.lua:40: attempt to perform arithmetic on a nil value

Please help!

Cant help you if you dont tell me/us what line line 40 is :P . But anyway, the error means that something gets compared to something that hasnt got any value, so just check all the previous statements where that variable is involved in. Hope that its clear, otherwise you need to tell which line it is.

[kozine]

NVM it fixed. I had less tiles.

[shadow-evillink]

Ok try this:

--Load images
pica = Image.load("Path to image")
picb = Image.load("Path to image")

--Begin the main loop
while true do
pad = Controls.read()

screen:blit(0, 0, pica)

if pad:cross() then
screen:blit(0, 0, picb)
end

screen.flip()
end

That works for me!

It didn't work the way I wanted it too. I'm tring to make a pinball game and I want the flappers to move



With the code you gave me it overlaps on one another. Give it a try. I need that when one pic appears another disappears and viceversa. I would like the help. Thanks.

[kozine]

I dont think u replaces the 0's with the place u wanted it?

[shadow-evillink]

Yes I've changed the 0's but that does not change the overlapping.

[kozine]

--Load images
pica = Image.load("Path to image")
picb = Image.load("Path to image")

--Begin the main loop
while true do
pad = Controls.read()

screen:blit(0, 0, pica)

if pad:cross() then
screen:clear()
screen:blit(0, 0, picb)
end

screen.flip()
end

[c5cha7]

This works:

--Load images
bg = Image.load("bg.png")
pic = {}
pic[1] = Image.load("flapperleft1.png")
pic[2] = Image.load("flapperleft2.png")
imgpic=pic[1]

--Begin the main loop
while true do
screen:blit(0, 0, bg)
pad = Controls.read()

if pad:cross() then
imgpic=pic[2]
else
imgpic=pic[1]
end

screen:blit(0, 0, imgpic)
screen.flip()
end

Try it !
Also BG is the background, as i thought it would look neat...

[Greenskull]

Is there ANYBODY on this site that can help me make a two picture animation? at all?

[Gutya]

Explain EXACTLY what you would like to do Greenskull.

[Greenskull]

when you press X, I want a dude to talk using two pictures, I want him to keep talking untill I press X again.

[Gutya]

Something like(untested, just typed it up here):

frame1 = Image.load("bla.png")
frame2 = Image.load("bla2.png")

Animation = 0

while true do

pad = Controls.read()

if Animation = 0 then
screen:blit(x,y,frame1)
screen.flip()
screen.waitVblankStart()
end

if Animation = 1 then
screen:blit(x,y,frame1)
screen.flip()
screen.waitVblankStart(change depending on the delay needed)
screen:clear()
screen:blit(x,y,frame2)
screen.flip()
screen.waitVblankStart(again change for delay)
screen:clear()
end

if pad:cross() and Animation == 0 then
Animation = 1
end

if pad:cross() and Animation == 1 then
Animation = 0
end
end

I dunno if this works, as i say i just typed it up, but it should be along the lines of what you need.

[Altair]

As others have explained to you how animation works im not explaining that. To make the animation go untill you press X again just use a variable:

if pressed==true
play animantion
end

if pad:cross() and pressed==true then
pressed=false
end

easy as that...

[ro0kie42]

I don't get why this doesn't work. I keep getting the "attempt to index field '?' ( a nil value)" error.

for i = 1,21 do
something[i] = {x = 25 + 10 * i, y = 480 - picture1:height(), pic = picture1}
end
while true do
screen:blit(something[i].x, something[i].y, something[i].pic)
end

please don't just tell me what's wrong, also tell me how to fix it. Thanks

[Kameku]

You have to initiate something:

something = {}
for i = 1,21 do
something[i] = {x = 25 + 10 * i, y = 480 - picture1:height(), pic = picture1}
end
while true do
screen:blit(something[i].x, something[i].y, something[i].pic)
end

[ro0kie42]

How do I make a function run only once? (while in the "While true do" loop)

Also, when I want make a function to print a random number between say, 1 and 30, it prints all of them! How do I make it print just one? ( or maybe, assign just one number between 1 and 30 to a variable...I have the problem that if a = math.random(1,30), a = 1 through 30)