Lua Programming Help Thread

[Altair]

I tried using functions. Thats when it isn't working. Hmm I'll just go over the code again. Thx though!

[HaxxBlaster]

if pad:cross() then
if menustatus == 0 then
dofile("./data/game.lua")
end

I guess that this part should be more like this.

if pad:cross() and menustatus == 0 then
		dofile("./data/game.lua")
	end

[Altair]

That wasn't my code but soadnation's, but thx anyway =). BTW idon't really understand your piece of code, atleast i don't see how it would make your character jump. Im guessing yP is the jumpt variable. But i don't get the time thingies. So sorry can't help ya there.

And i still don't get my code to run. Since i put those functions in it doesnt work. I don't get it. According to me theres nothing wrond, but yeah ofcourse there is. Is this a correct usage of the function command:

function game()
while true do
...... -- code here
end
end

And can i go back to it like this:

if pad:cross() then
game()
end


Its a bit long sorry bout that.
Altair

EDIT: Ok got it to work but only because i changed the code to using while commands instead of function. I would still like to know if i use the function command correct though and what i coould have done wrong. Thx!

[c5cha7]

ok i pinpoted the problem down to exit funtion(if pad.start() break). when i delete4 it it lodss. kindof. when it loads it just freezes right away this i have no idea what could be causeing it.

This is a fixed version of your code.

green = Color.new(0, 255, 0)
color = Color.new(255, 255, 255)
menustatus=0

while true do
--set menu option
--Select Options
pad = Controls.read()
if pad:down() then
	menustatus = menustatus + 1
screen.waitVblankStart(10)
end
if pad:up() then
	menustatus = menustatus - 1
screen.waitVblankStart(10)
end

if pad:cross() and
	menustatus == 0 then
		dofile("./index.lua")
	end
	if menustatus == 2 and pad:cross() then
		break
	end
--Make Menu
if menustatus == 0 then
	screen:print(160, 100, "Play", color)
	screen:print(160, 120, "Info", green)
	screen:print(160, 140, "Exit", green)
	screen.flip()
end

if menustatus == 1 then
	screen:print(160, 100, "Play", green)
	screen:print(160, 120, "Info", color)
	screen:print(160, 140, "Exit", green)
	screen.flip()
end

if menustatus == 2 then
	screen:print(160, 100, "Play", green)
	screen:print(160, 120, "Info", green)
	screen:print(160, 140, "Exit", color)
	screen.flip()
end
if menustatus == -1 then
menustatus = menustatus +3
end
if menustatus == 3 then
menustatus = menustatus -3
end
end

I Deleted everything that wasnt needed
Because you had alot of stuff that wasnt needed at all lol.
Anyway i hope you like it and i made it possible
to select "EXIT" and then press cross to exit lol.

EDIT:
I Added the bit where you are at "Play" and then
press up and you select EXIT...
Anyway please say thanks when you drop by :icon_bigg

[soadnation]

sweet thanks alot. i was starting to think i should just ask someoene if i could use there menu. anyways now i just need to get started on the game part. it should be pretty easy exept for one part but ill ask for help when i get to it.

quick question. ive been looking at some other apps and they use dofile to load stuff like all the colors, in game menu's, or like in acno's energizer he loads the dig funtion.do i have to do anything special for that or can i just load then in the begining of the script?

[c5cha7]

sweet thanks alot. i was starting to think i should just ask someoene if i could use there menu. anyways now i just need to get started on the game part. it should be pretty easy exept for one part but ill ask for help when i get to it.

quick question. ive been looking at some other apps and they use dofile to load stuff like all the colors, in game menu's, or like in acno's energizer he loads the dig funtion.do i have to do anything special for that or can i just load then in the begining of the script?

You do know that you dont need to load a new script
from the menu?? You can just add your script to the menu
along with options etc..
I Could probally show you an example but i aint
so good at menu's yet (even though i fixed yours??? lol).

Anyway i think "dofile" is mainly for loading a new lua script.
Or you could probally use it to load addons etc..
I hope that clear's something on your todo list lol...

Good Luck :icon_smil

[Altair]

Well i have some sort of a basic menu, but it's in the main code. So if that's your question then no you don't have to use dofile. The only use i can think of it's easy to keep track of the different parts of code. Also its easy to change between different pieces of code: you can just rename the files.
Anyway i dont need it yet.

[Altair]

@HaxxBlaster:
I don't know how you want to code the jump, but i was thinking:

Just have a variable say z. Where z is the jump height. And if z increase you just make some anymation of a jump that plays at the same time. Increasing the z and then decreasing it when it reaches a certain value shouldn't be that hard. I don't really know how to make an animation of different images, but it shows you how to here (its at the last part) .
You probably have something like this, i guess. But if not then maybe this is a solution?

Altair


EDIT:
I see you did what i said sort of. But you can also do it like this, without the time variable, so its shorter:

if pad:cross() then

while i < 140 do -- or you can use "for ...." etc.

if i<71 then -- so till 70
yP = yP - 1
end
if i > 70 then -- so from 71
yP = yP +1
end

i=i+1

end -- end while
end -- end if pad:cross()

[Altair]

c5cha7, does the 10 in "screen.waitVblankStart(1 0 )" mean it waits 10 times the whole cycle or 10 seconds or something completly different?

[sofa king dumb]

c5cha7, does the 10 in "screen.waitVblankStart(1 0 )" mean it waits 10 times the whole cycle or 10 seconds or something completly different?

60=one second so that makes it wait about a 6th of a second

[sofa king dumb]

how would you make it so if x=5 then score+1 when x is pushed? i tried this but it didnt work
if pad:cross() then
screen:blit(184, 213, mallet)
screen.flip()
if count = 6 then
score = score + 1
end

[EminentJonFrost]

how would you make it so if x=5 then score+1 when x is pushed? i tried this but it didnt work
if pad:cross() then
screen:blit(184, 213, mallet)
screen.flip()
if count = 6 then
score = score + 1
end

first off, i'm not an experienced coder. (see my sig?) so if someone else comes with a possible solution, ignore me and listen to them, but i'll still try to help.

from what i see, the problem is what i dont see. your code doesnt mention 5 anywhere. i assume what you want is for the "count" to reach 6.

so this what i think you should do:

if pad:cross() then
screen:blit(184, 213, mallet)
screen.flip()
if count = 5 then --simply change 6 to 5.
score = score + 1
end

[c5cha7]

c5cha7, does the 10 in "screen.waitVblankStart(1 0 )" mean it waits 10 times the whole cycle or 10 seconds or something completly different?

60 = 1 second so 10 equal's 10 Mini sec's or whatever lol...
I just did that because it flicks past the menu too fast so you
wouldnt off been able to select anything ;) .

[PSPMillionaire]

how would you make it so if x=5 then score+1 when x is pushed? i tried this but it didnt work
if pad:cross() then
screen:blit(184, 213, mallet)
screen.flip()
if count = 6 then
score = score + 1
end

Explain more about what you are doing... also show more of your code.
and to compare you use ==
= is an assignment operator
if count == 6 is how you would check for that.

You said earlier you wanted to know how would you make it so if x=5 then score+1 when x is pushed

if pad:cross() and x == 5 then
  screen:blit(184, 213, mallet)
  score = score + 1
end

If you have a main loop the screen.flip() should be at the bottom of your main loop.

[soadnation]

@HaxxBlaster:
I don't know how you want to code the jump, but i was thinking:

Just have a variable say z. Where z is the jump height. And if z increase you just make some anymation of a jump that plays at the same time. Increasing the z and then decreasing it when it reaches a certain value shouldn't be that hard. I don't really know how to make an animation of different images, but it shows you how to here (its at the last part) .
You probably have something like this, i guess. But if not then maybe this is a solution?

Altair


EDIT:
I see you did what i said sort of. But you can also do it like this, without the time variable, so its shorter:

if pad:cross() then

while i < 140 do -- or you can use "for ...." etc.

if i<71 then -- so till 70
yP = yP - 1
end
if i > 70 then -- so from 71
yP = yP +1
end

i=i+1

end -- end while
end -- end if pad:cross()

i just want to do a dofile because it makes things seem more organized to me. in my vb programing class once im done with the basics i spend mroe time making it look nicer and more organized then i do on fixing it up.

now for the reason why i quoted. i was wondering if this would work(the part about juust having a Z variable for jumping)

[Altair]

well it works (i think, i haven't tried it yet), but it wont change the position of the character. By z i meant another variable than x and y, which i, and i think most people, use for the x and y coordinates. The z variable is just there so you can compare the z of the character and the z of the thing you are jumping over (if you have assigned it a specific z value). If you just want the jump animation, then just use the animation.

[Altair]

Thx both sofa king dumb and c5cha7, for explaining!

[TheM1ghtyTh0r]

Im trying to create a stopwatch for my psp but I've run into a few problems maybe some of you guys could help me out. I've been using MagicianFB's timer example that was posted earlier in this thread but I've run into a few problems. Most importantly is that after 15min or so it 'breaks', it displays 63 minutes and every minute after that it goes it subtracts a minute instead of adding one (62, 61, 60, 59 and so on) Anyone know a way to fix it or have an example of another timer? Here is the example I've been using:

-- Define Colors
white = Color.new(255, 255, 255)
yellow = Color.new(255, 255, 0)

-- Print Instructions
screen:print(5, 5, "Press L to begin and R to stop.", yellow)
screen:flip()

-- Create Timer
Timer = Timer.new(0)

-- Start Main Program
while true do
	screen.waitVblankStart(5)  
	pad = Controls.read()
	if pad:l() then
		Timer:reset()
		Timer:start()
		while true do
			pad = Controls.read()
			screen:clear()
			screen:print(5, 5, "Press L to begin and R to stop.", yellow)
			screen:print(220, 133, tostring(math.floor(Timer  :time()/1000/60) .. ":" .. math.floor((Timer:time()/1000/60-math.floor(Timer:time()/1000/60))*60) .. ":" .. string.sub(tostring(math.  floor(Timer:time()/10)), -2)), white)
			screen:flip()
			if pad:r() then
				Timer:stop()
				break
			end
		end
	elseif pad:start() then
		break
	elseif pad:select() then
		screen:save("screenshot.png")
	end
end

[Altair]

Which example is that? Can you post a link? Oh and there is a stopwatch example in the sample applications that come whith LUA.

EDIT:
Ok i think i have something here:

screen:print(220, 133, tostring(math.floor(Timer    :time()/1000/60) .. ":" .. math.floor((Timer:time()/1000/60-math.floor(Timer:time()/1000/60))*60) .. ":" .. string.sub(tostring(math.    floor(Timer:time()/10)), -2)), white)

should be:

screen:print(220, 133, tostring(math.floor(Timer:time()/1000/60) .. ":" .. math.floor((Timer:time()/100)/10) .. ":" .. math.floor(Timer:time()/10)), white)

Idon't think you need the "tostring" part aswell. I just don't know if it's possible to display multiple variables then, but probably you can.

[Altair]

Could someone explain what the command "local" means? I sometimes see it in front of some variables i think.

[Altair]

W00t!!! I finished my little test game! Its for some reason really addictive, eventhough it's a really stupid game. Its sort of an analog-skillz-trainer. You have to move a really small cursor over a really small target :) .

[TheM1ghtyTh0r]

Which example is that? Can you post a link? Oh and there is a stopwatch example in the sample applications that come whith LUA.

EDIT:
Ok i think i have something here:

screen:print(220, 133, tostring(math.floor(Timer    :time()/1000/60) .. ":" .. math.floor((Timer:time()/1000/60-math.floor(Timer:time()/1000/60))*60) .. ":" .. string.sub(tostring(math.    floor(Timer:time()/10)), -2)), white)

should be:

screen:print(220, 133, tostring(math.floor(Timer:time()/1000/60) .. ":" .. math.floor((Timer:time()/100)/10) .. ":" .. math.floor(Timer:time()/10)), white)

Idon't think you need the "tostring" part aswell. I just don't know if it's possible to display multiple variables then, but probably you can.

I used the code you gave me but it still breaks.... around 8 minutes

[SG57]

c5cha7, does the 10 in "screen.waitVblankStart(1 0 )" mean it waits 10 times the whole cycle or 10 seconds or something completly different?

technically, it waits 10 vertical blanks, which are how many times the processor refreshes the screen with what you said, so if you wanted some image to display for 5 seconds, than blit the image or w/e and put Screen.waitVblankStart(60 * 5)

its much easier just to have the psp do the math then have u, look in my other tread about me doing my homewokr in C/C++, youll see in my code (if u understand C/c++ that all i had to know was the procedure inwhich to do the problem, so if it was -x^2 (-x squared), you would do

x = pi;
x * x * -1 = y;
return y;

thats c/c++ simple functions on a graph, meaning the function is x squared then to its opposite, when x = pi, and earlier, pi was defined

you also could do it this way

x = pi;
x^2 = y;
return y;

[shadow-evillink]

The damn thing does not work.I'm using lua player 1.15. I'm just playing around with it. I just want to show a pic and display a some words.Lession one basics, but it doesn't work.Is it ok?This is my code:

testing---------------

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

background=Image.load("ba ckground.png")


screen:blit(0,0,backgroun d,false)
screen.waitVblankStart()
screen.flip()
end

screenrint(200,130,"It worked Finally",black)
screen:flip()
while true do
screen.waitVblankStart()
end
end

[KKDDKK]

Hi everyone I'm new here and i need a little help.Does someone know how can i create a slideshow with sound and can you upload me the index.lua(1.jpg, 2.jpg, 3.jpg, 4.jpg, 5.jpg and sound.wav)Please help

[nathan42100]

black=Color.new(0,0,0)
background1=Image.load("1.jpg")
 background2=Image.load("2.jpg")
 background3=Image.load("3.jpg")
 background4=Image.load("4.jpg")
 background5=Image.load("5.jpg")
 sound=Sound.load("sound.wav")
while true do
screen:clear(black)
sound:play()
if stage==1 then
screen:blit(backround1)
stage=2
elseif stage==2
screen:blit(backround2)
stage=3
elseif stage==3
screen:blit(backround3)
 stage=4
elseif stage==4
screen:blit(backround4)
 stage=5
elseif stage==5
screen:blit(backround5)
 stage=6
elseif stage==6
screen:blit(backround2)
 stage=1
end
screen.waitVblankStart(90)
screen.flip()
end

that might work.....

[KKDDKK]

I doesnt work but thanks anyway,does anyone else know?

[shadow-evillink]

Is my code able to work of not? If not why?

[Altair]

@ KKDDKK:
Nathan's code is almost right he just forgot to state that "stage =1" at the beginning. That's why it doesn't work because stage is never equal to 1, so it never starts (duh). So just add stage=1 at the beginning.
EDIT: Also change the "backround"'s to "background"'s hehe that might help hehe :P

@shadow-evillink:
Is this your complete code?

testing---------------
 
 black=Color.new(0,0,0)
 
 background=Image.load("background.png")
 
 
 screen:blit(0,0,backgroun d,false)
 screen.waitVblankStart()
 screen.flip()
 end
 
 screenrint(200,130,"It worked Finally",black)
 screen:flip()
 while true do
 screen.waitVblankStart()
 end
 end

if so then it should be:

 black=Color.new(0,0,0)
 background=Image.load("background.png")
 screen:blit(0,0,background,false)
 screenrint(200,130,"It worked Finally",black)

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

The thing you did wrong was that you put in an "end" while there wasn't any if/while/for/etc. command in fornt of it. Also you have a lot of waitVblankstart's and screenflips, but that should still work, i think.

[KKDDKK]

stage =1
black=Color.new(0,0,0)
background1=Image.load("1.jpg")
 background2=Image.load("2.jpg")
 background3=Image.load("3.jpg")
 background4=Image.load("4.jpg")
 background5=Image.load("5.jpg")
 sound=Sound.load("sound.wav")
while true do
screen:clear(black)
sound:play()
if stage==1 then
screen:blit(background1)
stage=2
elseif stage==2
screen:blit(background2)
stage=3
elseif stage==3
screen:blit(background3)
 stage=4
elseif stage==4
screen:blit(background4)
 stage=5
elseif stage==5
screen:blit(background5)
 stage=6
elseif stage==6
screen:blit(background2)
 stage=1
end
screen.waitVblankStart(90  )
screen.flip()
end

I edited it like this but it shows Error: index.lua:16: 'then' expect near 'screen'
Error: No script file found
Can someone please upload the whole document but the working one