Lua Programming Help Thread

[pspfreak9]

1) If i clear the screen and make it white, then blit a transperent image on it, and take a screen shot will the screen shot be transperent.

2) As for enycryption, could I do something like this:

if VAR == 4 then
VAR = "B"
end

3) How can I select characters from a txt file from a txt file like maybe the third letter in a txt file. So i want something like this:

if (i dont what goes here) == "3" then
whatever
end

The "i don't know what goes here" will be the third letter in the txt file.

[youresam]

1) If i clear the screen and make it white, then blit a transperent image on it, and take a screen shot will the screen shot be transperent.

No, the screen can never have a transparent value.

2) As for enycryption, could I do something like this:

if VAR == 4 then
VAR = "B"
end

Yes, but make sure you make the "B" a 4

3) How can I select characters from a txt file from a txt file like maybe the third letter in a txt file. So i want something like this:

if (i dont what goes here) == "3" then
whatever
end

The "i don't know what goes here" will be the third letter in the txt file.

whatever = string.sub(file:read(3),3 ,3)

[trex6662k5]

2)I had thought about using BASE64 or ROT13 as a method of obfuscation.
Though I have never attempted it as obfuscation. BASE64 is already being used

[pspfreak9]

No, the screen can never have a transparent value.


Yes, but make sure you make the "B" a 4


whatever = string.sub(file:read(3),3 ,3)

Ok thanks but can you explain the line of code i bolded, and underlined plz.

[youresam]

file:read(3) will return 3 characters from the text file
and Im telling it to take from character 3 to character 3 of that string.

you could also do:
file:seek("set",3)
whatever = file:read(1)

[pspfreak9]

Ok, I get it thanks youresam.
-= Double Post =-
Are there any tuts on LUA file io anywhere?
-= Double Post =-
any1...

[%chrono trigger%]

I really could use sme help getting this fixed dont have a clue how to fix it the error is at the bottom
heres the code:

System.usbDiskModeActivate() 

red = Color.new(225,0,0)
player = Image.load("player.png")
background = Image.load("background.png")
pic1 = Image.load("pic1.png")
pic2 = Image.load("pic2.png")
Pic = { }
Pic[1] = { x= 80, y = 95, h = pic1:height(), w = pic1:width() }
Player = { }
Player[1] = { x = 50, y = 107, h = player:height(), w = player:width() } 
screenwidth = 480 - player:width()
screenheight = 272 - player:width()
playerHeight = 90
playerWidth = 90
function movePlayer()
pad = Controls.read()
if pad:left() then 
Player[1].x = Player[1].x - 1 
end
if pad:right() then 
Player[1].x = Player[1].x + 1 
end
if pad:up() then 
Player[1].y = Player[1].y - 1 
end
if pad:down() then 
Player[1].y = Player[1].y + 1 
end
end

function collision(Pic,Player)
if (Pic[1].x+Pic[1].w > Player[1].x ) and (Pic[1].x < Player[1].x + Player[1].w) and (Pic[1].y + Pic[1].h > Player[1].y) and (Pic[1].y < Player[1].y + Player[1].h) then
	return true
	else
		return false
	end
end
Player[1].x = Player[1].oldx
Player[1].y = Player[1].oldy
while true do
pad = Controls.read()
screen:clear()
screen:blit(0,0,background)
screen:blit(Pic[1].x,Pic[1].y,pic1)
screen:blit(140,107,pic2)
screen:blit(Player[1].x,Player[1].y,player)
if pad:left() and Player[1].x > 0 then
Player[1].x = Player[1].x - 2
end

if pad:right() and Player[1].x < screenwidth then
Player[1].x = Player[1].x + 2
end

if pad:up() and Player[1].y > 0 then
Player[1].y = Player[1].y - 2
end

the exact error says: script.lua:47: calling 'blit' on bad self (number expected, got nil)
so your sam said i was calling a string and not a number, but i dont see where the error comes from.
can anyone fix it?

[youresam]

I really could use sme help getting this fixed dont have a clue how to fix it the error is at the bottom
heres the code:

the exact error says: script.lua:47: calling 'blit' on bad self (number expected, got nil)
so your sam said i was calling a string and not a number, but i dont see where the error comes from.
can anyone fix it?

Not sure, the code looks fine to me.
-= Double Post =-

Ok, I get it thanks youresam.
-= Double Post =-
Are there any tuts on LUA file io anywhere?
-= Double Post =-
any1...
-= Double Post =-
any1...
-= Double Post =-
any1...
-= Double Post =-
any1...
-= Double Post =-
any1...
-= Double Post =-
any1...
-= Double Post =-
any1...

Yeah there are. http://www.lua.org/pil/21.1.html

[%chrono trigger%]

exactly but thanks for trying
anybody else now?
could it be my images?
(im trying everything)

[youresam]

Player[1].x = Player[1].oldx
Player[1].y = Player[1].oldy

You never set a value for Player[1].oldx and Player[1].oldy, so the numbers become nil.

[%chrono trigger%]

that was the problem, so i added those variables into my table. it worked, but now my player wont move.

[emericaska8r]

i think you should do:

Player[1].oldx = Player[1].x
Player[1].oldy = Player[1].y

just switch them that way your player.x and player.y will not be the ones changed, allowing you to move

[%chrono trigger%]

nope didnt work any other suggestions
p.s. thanks for all the help everyone

[youresam]

His solution was for my bug report.

[%chrono trigger%]

ok sorry for bugging everyone, but ive got all errors fixed, but i just implemented jumping. now it says my guy is jumping, but he does not appear to be jumping how to i mkae it so he actually changes his "y" value and then comes back down?

[pspfreak9]

Quick Question:

return

What does that do, return to Lowser?

[pspaquaforce]

can someone please tell me where a simple enemy code is

[youresam]

Quick Question:

return

What does that do, return to Lowser?

Returns from the current function.
-= Double Post =-

can someone please tell me where a simple enemy code is

http://google.com

[Merick]

Ok, I need some help with a bit of code for printing text centered on the screen with truetype fonts.

Here's what I have so far:

blue = Color.new(0,0,255)
hyper = Font.load("fonts/hyperion.ttf")
hyper:setPixelSizes(10, 20)  

function printCentered(font, y, text, color)
     local length = string.len(text)
     local x = 240 - ((length*10)/2)
     screen:fontPrint(font, x, y, text, color)
end

screen:clear()

printCentered(hyper, 100, "This is a test", blue)
printCentered(hyper, 200, "This should be centered as well", blue)

screen.flip()

while true do
	pad = Controls.read()
	if pad:start() then break
	end
end

Since I've set the font width to 10, If I were using a fixed width font then 240 - ((length*10)/2) or (half of the screen width)-((number of characters in the text string * the pixel width of the font)/2) would center the line. But since I'm using a variable width true type font it's actually coming out to the left of center.

Can anyone tell if there is a function that can give me the actual pixel length of a string of text when using a variable width font?

*edit*

LOL, I post a question then find the answer myself a couple minutes later:

hyper:getTextSize(text)["width"]

[%chrono trigger%]

ok i added everything the only thing left is (dramatic silence) collision.
i added collision on another image and its right, however its giving me an error saying i need to add an end to close my 'while'.
i have an end at the end of the while true do loop that would end it so i dont understand whats wrong
any ideas?

[Access_Denied]

Check your entire code to make sure every IF and WHILE has an END.

[pspaquaforce]

:Jump:

[%chrono trigger%]

nevermind i fixed it

[Access_Denied]

Would you mind posting your code? Or PMing it?

[Anti-QuickJay]

Here is a simple enemy code

enemy1=Image.load(....)    --// enemy image

Enemy= {}
Enemy[1] = {x = ... , y = ...}     --//X and y Position of Enemy

function moveenemy() --dont forget to call the function
--your enemy movement function
if you move right then
   he moves to you
end                    

end

screen:blit(enemy[1].x, enemy[1].y, enemy1)

Just edit the code to fit your game, Very simple.

[pspaquaforce]

enemy1=Image.load(....) --// enemy image

Enemy= {}
Enemy[1] = {x = ... , y = ...} --//X and y Position of Enemy

function moveenemy() --dont forget to call the function
--your enemy movement function
if you move right then
he moves to you
end

end

screen:blit(enemy[1].x, enemy[1].y, enemy1)

the function part is what i am having trouble on

[youresam]

:Jump:

...

[pspaquaforce]

yes i thought the code you gave me would work so
-= Double Post =-
its really gay witout shake moving
shake should be kicking meatwads @$$ by now all he can do is give him that funny look

[youresam]

yes i thought the code you gave me would work so
-= Double Post =-
its really gay witout shake moving
shake should be kicking meatwads @$$ by now all he can do is give him that funny look

I KNOW ITS SO GAY WITHOUT SHAKE MOVING!


...





...






(man I need to stop going to this thread..)

[pspaquaforce]

HELP ME:Argh: didn't i send you the code but you didn't pm me back huh
youresam's thoughts " that retard pm again i thought i was done with him"
or did you think of that