Lua Programming Help Thread

[tre_flip]

yea i would have done that anyways

[dan369]

though u can re-use them thats wat i meant. 4 better Anim use animLib

[tre_flip]

just for now im gonna stick with animation without libraries, better for me to learn

[Nielkie]

timer = 0

function moveL()
timer = timer + 1

if timer == 2 then
change img
elseif timer == 4 then 
change img
      end
end

That is absolutely horrible code. Do not try help people untill you have a better grasp of the language yourself.
Ever heard of tables and math?

Forgot That. Have a drifferent timer 4 each animation, e.g timer2 = 0, timer3 = 0 etc

Why? You should only need one timer for all animations.

4 better Anim use animLib

You should be able to make something as good as animLib yourself. Animation, as well as sprite sheets are not difficult. Pay more attention in Maths, and read up on data structures (Such as Lua's tables.)

[tre_flip]

in no way were his intention for me to copy and paste that code or even copy and paste and modify slightly but give me a hint on a way to do sprite animation via a counter

[Nielkie]

in no way were his intention for me to copy and paste that code or even copy and paste and modify slightly but give me a hint on a way to do sprite animation via a counter

He has shown you the worst possible way to do it (which happens to be the way he does it in his shoddily coded RPG)

[tre_flip]

why so negative? technically the worst is a way not working at all.
so if your so smart then what is the best/way you recommend

[TurtlesPwn]

A method similar to what I recommended or one you make on your own, but that would require too much comprehension and understanding on your part and thus is fairly pointless until you actually learn to do things on your own in the world of programming.

[dan369]

He has shown you the worst possible way to do it (which happens to be the way he does it in his shoddily coded RPG)

I know that its the worst, most inefficient way of doing animation.
It's just a simple, easy way.
You most probably could make a better animation urself. I was just suggesting POSSIBLE ways of doing it.

[yaustar]

Look at the animation snippet I did here: Lua Code Snippets I did a while back...

[dan369]

Look at the animation snippet I did here: Lua Code Snippets I did a while back...

Yaustar: Nice i'll take a look at those.
One question: Are u using Spirte sheets for it??? (I'm not near a computer right now so i cant see) i'm on my ps3:Jump:

[yaustar]

Yes I am.

[dan369]

Hummmhh....... SpirteSheets. After looking through yaustars example. I got confused.
So could someone explain???

[eldiablov]

If I remember correctly it is very well commented ...

[dan369]

After looking through yaustars example i got pretty confused.
Not with the animation but with the first function.
it said sumthing like setmetatable???
what is that?????

[eldiablov]

http://www.lua.org/manual/5.1/manual.html#2.8

[dan369]

Thanks, it was thinking y the 2 __?? but now i know.
And why there's index, it refers it to a table.
Thanks

[TurtlesPwn]

You CANNOT halfass your way around with metatables - you HAVE to learn them. Lua-users.org has some very good articles on how metatables (or even normal ones) can be used to trick your way into OOP in lua, and that's exactly what most people use them for.

[dan369]

Ok another question. I have 4 drifferent tiles in one img.
How would i code it so that it will take each img (32x32) and but it simply into a number on a map so that 1 would represent the first img etc.
???

[eldiablov]

Why dont you make your life easier and just use four seperate images ?

[_df_]

you could setup an SDL_Rect for each tile in the image. I dont know what luaplayer functions there are for this sort of thing. just calculate tile_index * width_of_tile to get the start offset for that tile. just remember youd need to blit 32 pixels then add tile_sheet_image_width - 32 to get to the next row in the tile. But if luaplayer gives you access to SDL_Rect's then that woud be a lot easier.

[dan369]

thanks i understand.
calculate the img width and height of each tile which is 32x32
Then put into a seperate array??

[PSProgramer]

ok, I have a question, I'm working on a battle system demo, and I am working on Ai for it, I have a function that takes away 5 health when the AI attacks, but it continues to take 5 health continuosly, how do I make it only take away 5 points per turn (I'm doing turn based battlesystem) I am thinking something like monster.attack and oldmonster.attack, but I'm not sure.

[yaustar]

ok, I have a question, I'm working on a battle system demo, and I am working on Ai for it, I have a function that takes away 5 health when the AI attacks, but it continues to take 5 health continuosly, how do I make it only take away 5 points per turn (I'm doing turn based battlesystem) I am thinking something like monster.attack and oldmonster.attack, but I'm not sure.

If the game is turn based and this is happening, then there is something wrong with the turn based system. I would take a deeper look at the logic.

[_df_]

sure, you can precalc your offsets, its really only handy when you have a sprite sheet that is more than 1 line of sprites deep, since if its just 1 row, its just an index * 32 calculation.

but you could if you wanted to precalc you could do something like

sprites = {}

function CalcSprites(sprite_sheet, sheet_width, sheet_height, sprite_height, sprite_width)
    local row
    local col
    
    for row = 0, sheet_height / sprite_height do
        for col = 0 .. sheet_width / sprite_width do
            sprites[#sprites] = { width = sprite_width, 
                height = sprite_height,
                sheet = sprite_sheet,
                offset = (row * sprite_height) + (col * sprite_width) }
        end
    end
end

putting the sprite sheet in there, you can load mutliple sprites into the one table, or extra things like a transparency colour, etc

[PSProgramer]

@yuastar: should I have 2 different loops, for each turn?? one for characters, and one for enemies??

[dan369]

Sorry, i should of said its 4 a tilemap. I've dun it know. Anyway.

function getTileWidth()
Width = tiles:Width
tileWidth = {}

if Width then
   Width = Width / 2
    table.insert(tileWidth, width)
end

Then should I do sumthing like this‚

 
tiledata = {
tileWidth[1],
tileWidth[2]
}

Would That work....?????

[PSProgramer]

BTW: @yuastar: I figured it out thank you

[pspprelgnd]

i have a question. how do you make 3d lua applications?

[TurtlesPwn]

For a very basic screw understanding it but know how to do it kind of tutorial, check here:
http://tacticalpenguin.com/snippets/3d.txt