Lua Programming Help Thread

[CtrlAltDeleteDie]

Wow. I messed up something. If all of the Enemies' states are equal to "dead", then I want it to print a message. How would I go about doing that. Look above for messed up code.

[SG57]

Please... Before making a game, understand the concept of programming and the routines used to do what you want.

zombies_dead = 0

for i=0,6 do
     if Enemy[i].state == "dead" then
          zombies_dead = zombies_dead + 1
     end
end

...

if zombies_dead == 6 then screen:print(0,0,"Zombies all dead...",color) end

This is the most efficient way I see fit.

[Branin]

I'm having a bit of a problem adding a start menu to a game that im helping to make. i get this error.

error: game.lua;246: attempt to compare nil with a number
Error: No script file found.

Any help would be great.

--Conker Mini
--Aug 26, 2006

black = Color.new(0, 0, 0)
white = Color.new(255,255,255)
green = Color.new(0,255,0)
red = Color.new(255,0,0)
textcolor = Color.new(0, 0, 0)
selecolor = Color.new(255, 255, 255)
editcolor = Color.new(0, 0, 0)
cursorcolor = Color.new(255, 250, 250)
scene = {}
healthbar = {}
healthbar.y = 10
background = Image.load("images/background.png")
background2 = Image.load("images/background.png")
start = Image.load("images/start.png")
conkerPoint = 0
Player1 = Image.load("images/conker/right/conker1.png")
Player2 = Image.load("images/conker/right/conker2.png")
Player3 = Image.load("images/conker/right/conker3.png")
Player1L = Image.load("images/conker/left/conker1.png")
Player2L = Image.load("images/conker/left/conker2.png")
Player3L = Image.load("images/conker/left/conker3.png")
Player = {}
Player.image = Player1
Playera = Image.load("images/conker/right/conkera.png")
Playera2 = Image.load("images/conker/left/conkera2.png")
Playerj = Image.load("images/conker/right/conkerj.png")
Playerj2 = Image.load("images/conker/left/conkerj2.png")
Playerp = {}
Playerc = {}
Player.y = 200
Player.x = 0
Player.lives = 4
Player.health = 200
Player.gravity = 200
Player.jumpspeed = 10
Player.jumpstate = "ground"
playerHeight = 66
playerWidth = 55
x = 0

counter = Timer.new()
counter:start()
oldTime = counter:time()

Timer = 0

pad = Controls.read

function moveRight()
Timer = Timer + 1

 if Timer>= 25 or Timer<=0  then
    Timer = 0
      end         
                             
        if Timer==5 then
        Player.image = Player1
        end
        
        if Timer==10 then
        Player.image = Player2
        end
        
        if Timer==15 then
        Player.image = Player3
        end
end        

function moveLeft()
Timer = Timer + 1

 if Timer>= 25 or Timer<=0  then
    Timer = 0
      end         
                             
        if Timer==5 then
        Player.image = Player1L
        end
        
        if Timer==10 then
        Player.image = Player2L
        end
        
        if Timer==15 then
        Player.image = Player3L
        end
end

--Conker Music
--Aug 26, 2006

Music.playFile("music/windy.it", false)        

while true do

pad = Controls.read()

--print background
--Aug 22, 2006

screen:clear()
screen:blit(0,0,background)

--print Conker
--Aug 23, 2006

screen:blit(Player.x,Player.y,Player.image,true)

--Conker walk right
--Aug 22, 2006

if pad:right() then
moveRight()
Player.x = Player.x+4
end


--Conker walk left
--Aug 23, 2006

if pad:left() then
moveLeft()
Player.x = Player.x-4
end

--Conker attack
--Aug 24, 2006

if pad:cross() and oldpad:cross()~=pad:cross() then
if Player.image == Player1 or Player.image == Player2 or Player.image == Player3 or Player.image == Playerj then
Player.image = Playera
end
if Player.image == Player1L or Player.image == Player2L or Player.image == Player3L or Player.image == Playerj2 then
Player.image = Playera2
end
end

if Player.image == Playera then
conkerPoint = conkerPoint + 1
end
if Player.image == Playera2 then
conkerPoint = conkerPoint + 1
end

if Player.image == Playera and conkerPoint == 14  then
Player.image = Player1
conkerPoint = 0
end
if Player.image == Playera2 and conkerPoint == 14  then
Player.image = Player1L
conkerPoint = 0
end


--Conker Jump
--Aug 24, 2006

if pad:up() and pad:up() ~= oldpad:up() and Player.jumpstate == "ground" and Player.image ~= Playerc and Player.image ~= Playerp and Player.image ~= Playerc2 and Player.image ~= Playerp2 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 < 200 and Player.jumpstate == "falling" then
Player.gravity = Player.gravity + (Player.jumpspeed + 3)
end

if Player.gravity == 200 then
Player.jumpspeed = 10
Player.jumpstate = "ground"
end

if Player.jumpstate == "jumping" and Player.image == Player1 then
Player.image = Playerj
end
if Player.jumpstate == "jumping" and Player.image == Player2 then
Player.image = Playerj
end
if Player.jumpstate == "jumping" and Player.image == Player3 then
Player.image = Playerj
end
if Player.jumpstate == "jumping" and Player.image == Player1L then
Player.image = Playerj2
end
if Player.jumpstate == "jumping" and Player.image == Player2L then
Player.image = Playerj2
end
if Player.jumpstate == "jumping" and Player.image == Player3L then
Player.image = Playerj2
end
if Player.jumpstate == "ground" and Player.image == Playerj then
Player.image = Player1
end
if Player.jumpstate == "ground" and Player.image == Playerj2 then
Player.image = Player1L
end

if Player.gravity > 200 then Player.gravity = 200
end

Player.y = Player.gravity

--Healthbar
--Aug 24, 2006

screen:fillRect(0,0,480,30,black)
screen:fillRect(29,9,202,12,white)
screen:fillRect(30,10,200,10,red)
screen:fillRect(30,10,Player.health, healthbar.y, green)
screen:print(30,0, "Health:" .. Player.health,green)
screen:print(260,0,"Lives left:",green)
screen:print(260,10,Player.lives,green)

if Player.health <= -1 then
Player.health = Player.health + 1
end

if Player.health <= 0 and Player.lives > 0  then
reSpawn()
end

if Player.lives == -1 then
Player.lives = Player.lives + 1
end

--Exit game
--Aug 22, 2006

if pad:start() and oldpad:start()~=pad:start() then
			screen.waitVblankStart(10)
			while true do
				screen:clear()
				screen:blit(0,0,start)
				pad=Controls.read()
				if pad:up() and oldpad:up()~=pad:up() then
					sel=sel-1
				elseif pad:down() and oldpad:down()~=pad:down() then
					sel=sel+1
				end
				if sel<1 then sel=3 end
				if sel>3 then sel=1 end
				local choice={"Save","Save & Quit","Quit"}
				local chcol={editcolor,editcolor,editcolor,editcolor}
				chcol[sel]=selecolor
				screen:blit(190,106,start)
				screen:print(224,117,choice[1],chcol[1])
				screen:print(196,127,choice[2],chcol[2])
				screen:print(224,137,choice[3],chcol[3])
				if pad:start() then break end
				if pad:cross() then
					if sel==1 or sel==2 then
					break	
					end
					if sel==2 or sel==3 then
					break	
					end
					break
				end
end
end

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

[CtrlAltDeleteDie]

Please... Before making a game, understand the concept of programming and the routines used to do what you want.

Sorry I don't understand all the concepts. I know that if you program in C then you must understand everything because its so much better than Lua.

But thanks for the help anyways.

[SG57]

come on... interpret the error....... Its saying that 'sel' isn't a variable. You haven't declared 'sel' anywhere.

Just add: sel = 1
To the top of your script somewhere as a global variable.

[Branin]

thanks sg57, now it dosent error.. but it displays and goes away real fast.

[Bronx]

add a extra screen.waitVblankStart(12 0) or w/e (thats for 2 seconds). That might help... which line is the error on, i dont want to count

btw, I recognize that animation ;)

[SG57]

That delay wont do anything to my understandings... Remove your screen:clear() statement when entering the loop. Place it outside the loop but still to be declared when START is pressed, that way it only clears the screen once, then starts to draw in the while loop.

[Branin]

if pad:select() then
break
end
if pad:start() then
screen:clear()
end
if pad:start() and oldpad:start()~=pad:start() then
			screen.waitVblankStart(10)
			while true do
				screen:blit(0,0,start)
				pad=Controls.read()
				if pad:up() and oldpad:up()~=pad:up() then
					sel=sel-1
				elseif pad:down() and oldpad:down()~=pad:down() then
					sel=sel+1
				end
                                if pad:start() and oldpad:start()~=pad:start() then 
                                break 
                                end
				if sel<1 then sel=3 end
				if sel>3 then sel=1 end
				local choice={"Save","Save & Quit","Quit"}
				local chcol={editcolor,editcolor,editcolor,editcolor}
				chcol[sel]=selecolor
				screen:blit(190,106,start)
				screen:print(224,117,choice[1],chcol[1])
				screen:print(196,127,choice[2],chcol[2])
				screen:print(224,137,choice[3],chcol[3])
				        if pad:cross() then
					if sel==1 or sel==2 then
					break	
					end
					if sel==2 or sel==3 then
					break	
					end
					break
				end
end
end

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

is this what you were trying to tell me to do? Probably not cause it dosent do right either.. and i added the break in there so i can restart the script. I'm using an EBOOT.

@bronx, i wonder why

[LMelior]

Another way to do it would be to put "oldpad=pad" right after you check for the button press. That would make it so you don't need the delay. Also, it will act funky because you forgot to put that same line at the end of the while loop. Alternatively, you could just put that line once at the very top of the while loop. As long as it is in there, it will stop the start menu from exiting.

[Branin]

Thanks LMelior. I should have asked you in the first place 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..

[Altair]

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?

[LMelior]

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

[HaxxBlaster]

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.

background = Image.createEmpty(480, 272)

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

[yaustar]

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

[Branin]

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.

[Mraellis]

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
screenrint(10,10,ourline,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

[Bronx]

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...)

[Hooger]

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

[PSPduh]

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

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

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

=p

[Hooger]

thanks mister leet guy

[SG57]

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...

[Bronx]

Im learning both ;)

[HaxxBlaster]

"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.

board:blit(0,0, example)

[Aphonia]

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.

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.

[LMelior]

"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.

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.

[HaxxBlaster]

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..

[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.

[Aphonia]

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().

[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