Lua Programming Help Thread

[GuitarGod1134]

Ok im trying to get my tab reader working and im trying to print all the lines of a tab to the screen from a text file named tab.txt and its not working. So far here is my code

--declare some colors and whatnot
blue = Color.new(0,0,255)
red = Color.new(255,0,0)
background = Image.createEmpty(480,272)
background:clear(blue)
--main loop
while true do
screen:blit(0,0,background)
--now lets read the tab
y = 5
file = io.open("tab.txt","r")
for line in file:lines() do
y = y + 5
screen:print(0,y,line,white)
end
file:close
screen.waitVblankStart()
screen.flip()
end

And here is whats inside my text file
named tab.txt

-3---3--------------2-0-------|
-3-----3---3------3-----3---3-|
-0-------0------2---------2---|
-0------------0---------------|
------------------------------|
-3----------------------------|

Im trying to get scrollign to work also if someone could help me there too. and one more thing this line

file = io.open("tab.txt","r")

What is my tab is in a certain directory wouldnt it be

file = io.open("./tab/tab.txt","r")

right?

Could use some help.
O yah adn the error im getting is like something wrong with the argument screen on line 20 or somethign
-= Double Post =-
Anyone?

[SG57]

For one, your asking sooo much of other people. Please - you don't learn anything asking people to write your code for you. You should simply say your error you recieved, what your trying to do and the code on that line.

I say this because you dont even have 20 lines of code in that thing you posted.. Want help - ask appropriately. And for scrolling, move the X coordinate of the text your printing to the left. Oh and one more thing, default text height in lua is 10 pixels, so y = y + 5 will have every letter cut off from the top by the other...

[GuitarGod1134]

Ok I run it, I changed the y coordinate and I still get an error.

It thinks or from what I can tell, there is something wrong with screen.waitVblankStart()
It says
error :snake.lua:17: function arguments expected near 'screen'
-= Double Post =-
O and the 20 lines, I took some notes there for coordinates and stuff but now I removed it and it says the error is on 17. and I dont see anything wrong with screen.waitVblankStart()

[pspfreak9]

Didn't you have this question before?? And you got a answer. Plus what is line 20??

[GuitarGod1134]

No, and its the 20th line of code , but its really the 17th line.

[pspfreak9]

you should read some tuts. I'm no sure how to do it but i Think this is how:

tab = "./tab/tab.txt"
file = io.open(tab, "r")
print(file)

[Anti-QuickJay]

Sticky.
:)

[pspfreak9]

Sticky.
:)

What do you mean by sticky the Lua Help Thread??

[Anti-QuickJay]

You see, When its sticky, It stays at the top of the forum, So its easier to find, So i have to pay like 700 points a week to do so, I don't know why a moderator just doesn't do it but it doesn't matter, Cause i got the points to do so.

[ZeroMega]

How can I make an image move on it's own without any key commands?

[emericaska8r]

How can I make an image move on it's own without any key commands?

well if you did have it controlled with key commands you would do:

if pad:left() then
image.x = image.x - 2
end

so if you want to make it go on it's own, then in your main loop simply put the

image.x = image.x - 2

[ZeroMega]

so if you want to make it go on it's own, then in your main loop simply put the

image.x = image.x - 2

It keeps saying loop ingettable when I try running it

Here's the code (I'm using Evil Mana's tute)

--Test

grass = Image.load("grass.png")
player = Image.load("player.png")
flower = Image.load("flower.png")

screenwidth = 480 - player:width()
screenheight = 272 - player:width()

Player = { }
Player[1] = { x = 200, y = 50 }

-- Function to check player movements
function playerMovement()
pad = Controls.read()
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

if pad:down() and Player[1].y < screenheight then
Player[1].y = Player[1].y + 2
end
end

-- Function to paste images to screen
function pasteImages()
for a = 0, 14 do
for b = 0,8 do
screen:blit(32 * a, 32 * b, grass)
end
end

screen:blit(100,100,flower)
screen:blit(300,220,flower)

screen:blit(Player[1].x,Player[1].y,player)
end

-- Main Loop
while true do

screen:clear()

pasteImages()

playerMovement()

screen.waitVblankStart()
screen.flip()
end

Where would I put the script so flower can move?

[pspfreak9]

Do it like this:

while true do
image = Image.load("image.png")
image.x = image.x-2
screen:blit(image.x,0,image,false)
end

-= Double Post =-
ITS THE SAME THING I DID!!??

[ZeroMega]

ITS THE SAME THING I DID!!??

I'm using this tutorial as my main example
http://evilmana.com/tutorials/lua_tutorial_08.php

btw i dont know where to put the code

[Cheez Pirate]

Ok. I gotta loading bar that displays a red line. If it were 50% loaded it would be halfway filled up and if it were at 100% it would be filled completely up. Now I wanna know how I can make to where I can change the percentage each time something is loaded.

Like:

if Image.load("something.png") then
data.loaded = 50
end

But that doesn't seem to bring it to being halfway filled up. Actually it displays an error message. Is there a way where if I load something it will raise the loading bar by however much?

[pspfreak9]

IS data.loaded a real function??

[Cheez Pirate]

No i made it before the loop. It looks like this.

data {}
data.loaded = 0
while true do

[pspfreak9]

ok do this:

if data.loaded = 50 then
Image.load("50.png")
end

You know most people just make a loading bar animation when nothing is being loaded. But if you wanna do that add a random feature that changes the thime of loading each time. ;)

[Cheez Pirate]

that would take a lot of different image files. :X

EDIT: and even if I decided to do that it still goes back to my question. how would I raise data.loaded everytime I loaded something.

[pspfreak9]

I told you just make a load bar that doesnt have to do with the data. And add different ones that take different time. Then make them random thats should make it seem like it's real.

[Cheez Pirate]

I don't want it to seem real.. I want it to be real.. O_o

[pspfreak9]

Whats loading in your game??

[Cheez Pirate]

Just like the maps, menus, extra data, libraries.. That stuff. But I only want it on a loading menu to look cool. ;)

[pspfreak9]

While can I see part of your code then??

[SG57]

Cheez_Pirate. Add to a variable after each image is loaded. Print out that variable in a percent form. Or if you want a loading bar, do the same but apply it to the sourcex/sourcey of an image when blitting.

[Cheez Pirate]

I'm having a hard time understanding that SG57. I'm trying to do something like.. A GTA loading screen. It's the very first thing that comes up on GTA except the rockstar logo. It pretty much loads the bigger parts in the game such as the maps weapons and characters. And everytime something is loaded the bar will go farther.

EDIT: 300th post.

[TacticalPenguin]

screen:fillRect(x,y,varua ble,h,color)

Make a variable and as you load the stuff make the variable go up.

IE Image.load("img.png") loadingvariable = loadingvariable + 1

Then with screen:fillRect fill in the rectangle and where i put variable in it thats the width of the bar, the higher the number gets the wider the bar gets.

[yotop456]

just a quick question about sprite sheets

if your using a sprite sheet with animlibv.4 does the sprite sheet have to be 272 in hight and 480 in diamiter to work?

I am using my own sprite sheet which is about 500 by 600, though the individual images on the sprite sheet are 240 by 200. when i load the program, it gives me a cannot load image error.

If this isnt possible , is there a way to shrink my sprite sheet, then use a code to magnify each frame to the size it was intended to be?


does anyone no how to solve this ?

Thanks

[Cheez Pirate]

screen:fillRect(x,y,varua ble,h,color)

Make a variable and as you load the stuff make the variable go up.

IE Image.load("img.png") loadingvariable = loadingvariable + 1

Then with screen:fillRect fill in the rectangle and where i put variable in it thats the width of the bar, the higher the number gets the wider the bar gets.

It works. But it will reload the image everytime it loops. :o Like the orange light will blink non-stop.

[Grimfate126]

just a quick question about sprite sheets

if your using a sprite sheet with animlibv.4 does the sprite sheet have to be 272 in hight and 480 in diamiter to work?

I am using my own sprite sheet which is about 500 by 600, though the individual images on the sprite sheet are 240 by 200. when i load the program, it gives me a cannot load image error.

If this isnt possible , is there a way to shrink my sprite sheet, then use a code to magnify each frame to the size it was intended to be?


does anyone no how to solve this ?

Thanks

animation lib supports all sizes that are compatible with lua. you CANNOT load ANY image greater than 512x512 in lua, which you are attempting to do.