Lua Programming Help Thread

[Bilo]

..............

[cools]

I am sorry to say that this one doent even display the text... i have noticed in whitehawks tutorial that he did it, so i am going to try and recreate that effect.

[Bilo]

board = Image.load("boardnew.png")
screen:blit(0, 0, board, false)
black = Color.new(0, 0, 0)
screen:print(200, 130, "Board", black)
screen.flip()
while true do
screen.waitVblankStart()

end

Sorry, I hadnt even tried what I told you to do. The above WILL work. I tested it


My excuse is that I'm not well. And so thats why what I told you to do was wrong

[cools]

Thanks! It works perfectly! :icon_smil

[Jenay]

I've commeted your program to help you find out why it was doing what it was doing..

Originally Posted by cools

well more troubles sadly

Lua will only load the first part of my script, which displays text... It wont load any thing after that.

black = Color.new(0, 0, 0)
screen:print(200, 130, "Board", black)
screen.flip()
while true do              -- your program hangs here
screen.waitVblankStart()  -- because this is going to loop
end                      -- forever since true is always true

board = Image.load("boardnew.png")
screen:blit(0, 0, board, false) -- putting the picture over your text is going to erase the text. Maybe print the board first, then the text
screen:flip()
while true do
screen:waitVblankStart()
end

[cools]

Thanks Jenay. Hopefully this will not happen again!

[Bilo]

Originally Posted by cools

Thanks! It works perfectly! :icon_smil

No problem

[MagicianFB]

Originally Posted by Dremth

How can I make something where the user enters text? Like on the PSP when you click on a text box the dialog comes up that has the letters and numbers like on a cell phone. Is there a way to get that?

PLEASE PLEASE PLEASE EMAIL ME!!!!!!
Dremth@austin.rr.com

Wow that took me a while...
Ok put keyboard.lua (rename it to that) in the same file as your main code.
Then put this in your main code:

dofile("keyboard.lua")

When you want define a variable or print something you can define the variable or what it's printing as keyboard()

-- Examples
print(keyboard())
thetext = keyboard()

This will allow you to input what it is going to register the value as.

=================
Start - Enter Value
D-pad - select key
R - Space
L - Delete
Select - Like holding down shift
Control pad - Press the button corresponding with the character on the selected key
================

I've tested it and it seems to work on luaplayer v9 but not v11

[goldnetx]

I'm having a bit of trouble with the Timer function.

Using this as code:

Timer = Timer.new(0)

I get:

error: DEFUSE.LUA:27: attempt to index global 'Timer' (a nil value)
Error: No script file found.

Press start to restart

Thanks in advance for any help.

[MagicianFB]

Originally Posted by goldnetx

I'm having a bit of trouble with the Timer function.

Using this as code:

Timer = Timer.new(0)

I get:

error: DEFUSE.LUA:27: attempt to index global 'Timer' (a nil value)
Error: No script file found.

Press start to restart

Thanks in advance for any help.

It's Timer:new(0)
You have to use a colon.

[goldnetx]

Hm...I've got the timer now working, but I'm having another problem with it.

If I run the program once it works fine, but once I try and run it a second time I get this error:

error: DEFUSE.LUA:152: loop in gettable
Error: No script file found.

Press start to restart

The code I have at Line 152 is this:

Timer:start()

[Snaku]

MagicianFB, can you tell a little about your rpg? Are you just using screen sized backgrounds or can you do the scrolling bg most rpgs have?
I'm interested in doing an rpg myself, and since there seems to be no rpg maker in site for psp, I'm learning lua now. It'd be nice to hear a little about your project so I have a general idea of how to get started.
Also, this may be a little advanced, but would there be a way to display some sort of fmv? I'm not expecting to be able to do a Final Fantasy or something as my very first project, but it seems like with the psp's power it shouldn't be a problem to have decent looking backgrounds and even a movie or two, right? Is there maybe a way for your lua script to make calls to the psp firmware functions? Like to use the psp's built in mp4 or mp3 playback? Or is that something that would need to be built into the actual lua player?

[lingon]

Can u make lua loop this kind of code?

pad = Controls.read()

	if pad:circle() then
		screen:blit(0, 0, lua, false)
		screen:print(220, 170, "Fel", svart)
		screen:print(220, 190, "Triangel: Tillbaka", svart)
		screen:print(220, 210, "[]: Avsluta", svart)
		screen.flip()
	
		while true do
		
		jag = Controls.read()
		
		if jag:triangle() then
			screen:blit(0, 0, lua, false)
			screen:print(220, 170, "Hejsan", svart)
			screen:print(220, 190, "O: Nåt trevligt", svart)
			screen:print(220, 200, "X: Info", svart)
			screen:print(220, 210, "[]: Avsluta", svart)
			screen.flip()
		end
		end

[MagicianFB]

Just put a while true loop around the entire thing, too

Originally Posted by lingon

Can u make lua loop this kind of code?.

pad = Controls.read()

	if pad:circle() then
		screen:blit(0, 0, lua, false)
		screen:print(220, 170, "Fel", svart)
		screen:print(220, 190, "Triangel: Tillbaka", svart)
		screen:print(220, 210, "[]: Avsluta", svart)
		screen.flip()
	
		while true do
		
		jag = Controls.read()
		
		if jag:triangle() then
			screen:blit(0, 0, lua, false)
			screen:print(220, 170, "Hejsan", svart)
			screen:print(220, 190, "O: Nåt trevligt", svart)
			screen:print(220, 200, "X: Info", svart)
			screen:print(220, 210, "[]: Avsluta", svart)
			screen.flip()
		end
		end

I'm posting from school

[lingon]

Okay, thanks alot.

[SodR]

Does anyone know how I can change a number to the numer-1 or +1 with the triggers (or any button) like in PSP Soduko?? So if I program a button to insert a 5 or any numer in 1, 1, then how can i change the 5 to go +1 each time I press the right trigger?

[Jenay]

if pad:r() then
   if var >= 5 then
      var = var + 1
   else
      var = 5
   end -- if
end -- if

something like this?

[SodR]

Originally Posted by Jenay

if pad:r() then
   if var >= 5 then
      var = var + 1
   else
      var = 5
   end -- if
end -- if

something like this?

I only get this error when I use your code: "attempt to comprare number with nil"

[tenksnit]

hi im new to the whole modding a psp thing... im from england and just downgraded my firmware and started to learna bit of lua

heres the code of my first program (after that tutorial):

System.usbDiskModeActivat e()

cursor = Image.load("cursor.png")

x = 200
y = 140

screen.waitVblankStart()

while true do

pad = Controls.read()


if pad:analogX() < -30
then x = x - 1 end

if pad:analogx() > 30
then x = x + 1 end

if pad:analogy() < -30
then y = y - 1 end

if pad:analogy() > 30
then y = y + 1 end

if pad:start()
then break end

screen:blit(x, y, cursor)
screen.flip()


end

im not sure if its going the right way to making a cursor move on the screen, ive had experience with java and things but all i get is an error that reads:

error: SCRIPT2.LUA18 loop in gettable

help will be appreciated

[lingon]

Maybe it has something to do with this

if pad:analogy() < -30 --I think you should have a big Y here instead of  a small one
then y = y - 1 end

if pad:analogy() > 30
then y = y + 1 end

I'm not sure though. Try it out and see what happens =)

[MagicianFB]

Originally Posted by lingon

Maybe it has something to do with this

if pad:analogy() < -30 --I think you should have a big Y here instead of  a small one
then y = y - 1 end

if pad:analogy() > 30
then y = y + 1 end

I'm not sure though. Try it out and see what happens =)

Yeah, I've never programmed using the analog stick, but I think you're right. It has to be analogX and analogY rather that analogx and analogy.

Edit: It make me sorta happy that this thread has lasted so long without being stickied.

[tenksnit]

ah... you were both right... lol capitilization errors.... always the way

thanks

[cools]

Im having some trouble creating dice. I just want to show the random number in a spot, then get rid of it, but i keep getting an error.

while true do
pad  = Controls.read()
dice2 = math.random(6)
if pad:cross() then
if dice2==1
then screen:print(90, 50, "1", black)
screen.flip()
if dice2==2
then screen:print(90, 50, "2", black)
screen.flip()
if dice2==3
then screen:print(90, 50, "3", black)
screen.flip()
if dice2==4
then screen:print(90, 50, "4", black)
screen.flip()
if dice2==5
then screen:print(90, 50, "5", black)
screen.flip()
if dice2==6
then screen:print(90, 50, "6", black)
screen.flip()
screen.waitVblankStart()
end
end

[Twenty 2]

Originally Posted by cools

Im having some trouble creating dice. I just want to show the random number in a spot, then get rid of it, but i keep getting an error.

while true do
pad  = Controls.read()
dice2 = math.random(6)
if pad:cross() then
if dice2==1
then screen:print(90, 50, "1", black)
screen.flip()
if dice2==2
then screen:print(90, 50, "2", black)
screen.flip()
if dice2==3
then screen:print(90, 50, "3", black)
screen.flip()
if dice2==4
then screen:print(90, 50, "4", black)
screen.flip()
if dice2==5
then screen:print(90, 50, "5", black)
screen.flip()
if dice2==6
then screen:print(90, 50, "6", black)
screen.flip()
screen.waitVblankStart()
end
end

Use elseif statements.

[tenksnit]

can anybody tell me how to set transparency colour for the pngs, e.g i want to make the edges of a cursor transparent

thanks

[Twenty 2]

If you use fireworks then you set the canvas to transparent and draw on to it.

[Jenay]

Originally Posted by SodR

I only get this error when I use your code: "attempt to comprare number with nil"

put:
var = 0

at the begining of your code.

[Jenay]

Originally Posted by cools

Im having some trouble creating dice. I just want to show the random number in a spot, then get rid of it, but i keep getting an error.

while true do
pad  = Controls.read()
dice2 = math.random(6)
if pad:cross() then
screen:print(90, 50,string.format("%d", dice2), black)
screen.flip()
screen.waitVblankStart()
end
end

try something like this.

[Twenty 2]

You might actually want to try

blue = Color.new(0, 0, 225)
while true do
pad  = Controls.read()
dice2 = math.random(6)
if pad:cross() then
screen:clear()
screen:print(90, 50,string.format("%d", dice2), blue)
screen.flip()
screen.waitVblankStart()
end
end

I changed the color so you could actualy see the number and I added a screen clear so that it doesnt print over it self so you cant read it.

[Faint]

Can lua load .mp3 files?