Lua Programming Help Thread

[MagicianFB]

Originally Posted by Twenty 2

Ok i fixed the == part and I forgot to put a % in front of d. No when I test the program and when i press up it goes straight to 2 and wont go higher. When i press down it goes straight to zero.

m = 1
ran = math.random(100)
blue = Color.new(0, 0, 225)

while true do

pad = Controls.read()

if pad:up() then
screen:clear()
screen:print(230, 136, string.format("%d", m + 1), blue)
screen:flip() end

if pad:down() then
screen:clear()
screen:print(230, 136, string.format("%d", m - 1), blue)
screen:flip() end

if pad:cross() and m == ran then
screen:clear()
screen:print(230, 136, string.format("%d", m), blue)
screen:print(230, 136, "You guessed correctly!", blue)
screen:flip() end

if pad:start() then
break end

end

That's because it's going to fast.

while true do
	screen.waitVblankStart(5) -- add this

[Twenty 2]

It still has the same problem and it shouldnt stop at 2.

[MagicianFB]

Originally Posted by Twenty 2

It still has the same problem and it shouldnt stop at 2.

Oh, I see, m stays as one, you never redefined it. It shoul be this:

m = 1
ran = math.random(100)
blue = Color.new(0, 0, 225)

while true do

pad = Controls.read()

if pad:up() then
m = m+1
screen:clear()
screen:print(230, 136, string.format("%d", m), blue)
screen:flip() end

if pad:down() then
m = m-1
screen:clear()
screen:print(230, 136, string.format("%d", m), blue)
screen:flip() end

if pad:cross() and m == ran then
screen:clear()
screen:print(230, 136, string.format("%d", m), blue)
screen:print(230, 136, "You guessed correctly!", blue)
screen:flip() end

if pad:start() then
break end

end

[Twenty 2]

Ok thnx it works now, but it goes to fast. Is there anyway to slow it down? Also how would you set limits to the number so its 0-100,like "if m<100 then
m=m+1?

[MagicianFB]

Originally Posted by Twenty 2

Ok thnx it works now, but it goes to fast. Is there anyway to slow it down? Also how would you set limits to the number so its 0-100,like "if m<100 then
m=m+1?

the screen.waitVblanKStark() makes it wait a certain amount of time before reading the next line of code.
Example: screen.waitVblanKStark(8) make it wait 8/60 of a second.
Use this at the beginning of the while loop to slow it down.

[tupac12]

hi am on the 2nd Tutorials in Lua and i get

error: script:127: \end/ expected (to close \while/ at line 65) near \<eof>/

here is the code

http://www.filefactory.com/get/f2.ph...3dda454f100e57

[MagicianFB]

As the error suggest, you left out an

end

somewhere in that code.

[tupac12]

Originally Posted by MagicianFB

As the error suggest, you left out an

end

somewhere in that code.

in line 65?

because its

while true do

there

[MagicianFB]

Originally Posted by tupac12

in line 65?

because its

while true do

there

So that means you never closed that loop with an end statement.

[sofa king dumb]

just a quick question, what does the "==" do

[MagicianFB]

Originally Posted by sofa king dumb

just a quick question, what does the "==" do

It ask if the two values are equal

[lingon]

This is supposed to be a timer program but I cant really get it to work. I suspect it has something to do with the tostring because I dont know much about these kinda things.

--Ett tidtagningsprogram

--Definiera färger
svart = Color.new(0, 0, 0)
vit = Color.new(255, 255, 255)

Timer = Timer.new(0)

--Definiera bilder 
lua = Image.load("lua.png")
luasplash = Image.load("luasplash.png")
klocka = Image.load("klocka.png")

function menu()
	screen:blit(0, 0, lua, false)
		screen:print(220, 170, "Carls tidtagningsprogramm", svart)
		screen:print(220, 190, "X:Info", svart)
		screen:print(220, 200, "O:Gå vidare till tidtagningen", svart)
		screen:print(220, 210, "Select: Avsluta", svart)
		screen.flip()
	
	while true do
		
		pad = Controls.read()
		
		if pad:cross() then
			screen:blit(0, 0,lua, false)
			screen:print(50, 200, "Detta program tillåter dig att ta tid.", svart)
			screen:print(50, 210, "Det skapades av Carl den 8 Okt 2005", svart)
			screen:print(220, 170, "Triangel:Tillbaka", svart)
			screen:print(220, 180, "Select: Avsluta", svart)
			screen.flip()
		end	

		if pad:triangle() then
			menu()
			screen.waitVblankStart()
			screen.flip()	
		end	

		if pad:circle() then
			menua()
		end
	end
end

function menua()
	screen:blit(0, 0, klocka, false)	
	screen:print(150, 180, "tryck R för att starta, L för att Stoppa och R+L för att återställa", svart)	

	while true do
		
		pad = Controls.read()
			
			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)), svart)
			screen.flip()		
		
			if pad:r() then
				Timer:start()
				Timer:reset(0)
			end		
	
			if pad:l() then
				Timer:stop()
				break
			end

			if pad:triangle() then
				menu()			
			end	
	end
end

screen:blit(0, 0, luasplash, false)
screen.waitVblankStart()
screen.flip()
screen.waitVblankStart(180)
menu()

It just flips around, maybe too many screen.flip()?
I think I'm gonna start making my programs in english from now on =)

[SodR]

Too bad there aren't so many swedish programers here to enjoy your app.

Lol ja heter också Karl...

[lingon]

Haha, hur stor är chansen för det? Det är inte så många som heter Carl/Karl nuförtiden.
Hursomhelst, Lua fixar ju inte å, ä, ö men jag funderar på om man skulle ta och göra två versioner utav ens programm, dom som blir bra asså. En svensk och en engelsk, om man orkar. Förresten, hur funkade det där med wait.VblankStart som jag Pm:ade om?

[lingon]

come on guys...hlp plz

[pspmachine]

Hey!

Does anybody know how to make text scroll upwards, say like film credits?

Thanks in advance...


--pspmachine :icon_smil

[Twenty 2]

Originally Posted by lingon

come on guys...hlp plz

I dont have time to look at whats wrong but here is an example of MagicianFB's timer

-- 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

[pspmachine]

And my question?

--pspmachine

[Twenty 2]

Theres a credit scroller at http://lumo.at.tt/ but it goes from right to left.

[sofa king dumb]

how would i make it display for example a score, would this be right?
screenrint(55, 55, "your score is"x, black) --with x being the score
screen.flip()

[MagicianFB]

Originally Posted by sofa king dumb

how would i make it display for example a score, would this be right?
screenrint(55, 55, "your score is"x, black) --with x being the score
screen.flip()

"your score is" .. x
This is how you put things together:

 ..

[goldnetx]

edit: *already covered*

[pspmachine]

Originally Posted by Twenty 2

Theres a credit scroller at http://lumo.at.tt/ but it goes from right to left.

Thanks alot buddy!

--pspmachine

[lingon]

Thx, twenty 2. I'll see what I can make out of it =)

[sofa king dumb]

how do you do colissions in lua?

[Twenty 2]

How do you make a sprite repeat when i button is pressed?

[tenksnit]

ok, im not sure if im talking rubbish here but how do u create an eboot from a lua script? 0_o ive seen some programs on the files list "created in lua" but how do they become eboots? all so confusing...

Thanks

[Twenty 2]

It doesnt have an eboot, you download Luaplayer 11 which does. It just uses script.lua which is put in the aplications.

[tenksnit]

ok, sorry ill re-phrase my queston:

i have seen programs availabe for download in the file section, they say they have been written in lua, but open using an eboot file, is there a way to somehow convert the lua script to be run by an eboot

e.g, run straight from the game menu, and not going through the lua player...

thanks

[Lancer]

Originally Posted by sofa king dumb

how do you do colissions in lua?

I wrote a function to detect collisions a couple of days ago. I'm not sure what the method is called (bounding box?), but the function returns true if the boxes are colliding.

function squarecollision(sq1xpos, sq1xsize, sq1ypos, sq1ysize, sq2xpos, sq2xsize, sq2ypos, sq2ysize)
   if sq1xpos <= (sq2xpos + sq2xsize) and (sq1xpos + sq1xsize) >= sq2xpos then
      if sq1ypos <= (sq2ypos + sq2ysize) and (sq1ypos + sq1ysize) >= sq2ypos then
         return true
      else
         return false
      end
   end
end

Just in case you don't understand the variables:

sq = square
1/2 = box 1 or 2
x/y = x or y axis
pos = position
size = size