Help In Lua

[Xodiac21]

ok. this has been holding off a few of my projects. can sumone write a simple tutorial/damn good explination of how to do sprites in lua.

for example. when i press right i want it to show the runnin animation without images screen bliting OVER each other.

[madsoul]

i also want more tutorials. (ops... request... :S )

[Macca]

http://www.lua.org/manual/5.0/ should be in there somewhere

Sprites? Like assign a sprite to a character? I could help...

[Xodiac21]

Originally Posted by TheMarioKarters

Sprites? Like assign a sprite to a character? I could help...

u know like in KONS game.....i went off a pre-done source for the sprites in sonic avol 3 but now i wanna get to understand it

[Macca]

Originally Posted by xodiac21

u know like in KONS game.....i went off a pre-done source for the sprites in sonic avol 3 but now i wanna get to understand it

if you really wanna understand it, look through the link i posted

[Soulphalanx]

Originally Posted by xodiac21

u know like in KONS game.....i went off a pre-done source for the sprites in sonic avol 3 but now i wanna get to understand it

hehe, KON just modified my game, so i coded most of it
its really not that hard, just putting an array of pointers,
and just changing the x value changes the frame

[youresam]

Here is how animations work...

Well, you use a timer object and say that if timer >= [time] then blit [sprite]
Then you say if timer > maxtime then timer:reset()

EXAMPLE:
sprite1 = Image.load("blah")
sprite2 = Image.load("blah")
sprite3 = Image.load("blah")
timer1 = Timer.new()
timer1:reset(0)

while true do
screen:clear()
if timer1:time() >= 3000 then
timer1:reset(0)
timer1:start()
end
if timer1:time() >= 2000 then
screen:blit(0,0,sprite3)
elseif timer1:time() >= 1000 then
screen:blit(0,0,sprite2)
else
screen:blit(0,0,sprite1)
end
screen.waitVblankStart()
screen.flip()
end


Note that I havent tested this, I just typed it up.

[youresam]

Originally Posted by macca-hacker

if you really wanna understand it, look through the link i posted

That will NOT help since images and timers are part of LUAPLAYER, not LUA.

[Soulphalanx]

he wants more like

sprite[1] = Image.load("blah")
sprite[2] = Image.load("blah")
sprite[3] = Image.load("blah")
x = 1

while true do
x = x + 1
screen:blit(0,0,sprite[x])
if x == 3 then
x = 1
end
screen.waitVblankStart(de lay between each frame)
screen.flip()
end

[Xodiac21]

Originally Posted by youresam

Here is how animations work...

Well, you use a timer object and say that if timer >= [time] then blit [sprite]
Then you say if timer > maxtime then timer:reset()

EXAMPLE:
sprite1 = Image.load("blah")
sprite2 = Image.load("blah")
sprite3 = Image.load("blah")
timer1 = Timer.new()
timer1:reset(0)

while true do
screen:clear()
if timer1:time() >= 3000 then
timer1:reset(0)
timer1:start()
end
if timer1:time() >= 2000 then
screen:blit(0,0,sprite3)
elseif timer1:time() >= 1000 then
screen:blit(0,0,sprite2)
else
screen:blit(0,0,sprite1)
end
screen.waitVblankStart()
screen.flip()
end


Note that I havent tested this, I just typed it up.

wow that jus confused me......

Originally Posted by Soulphalanx

he wants more like

sprite[1] = Image.load("blah")
sprite[2] = Image.load("blah")
sprite[3] = Image.load("blah")
x = 1

while true do
x = x + 1
screen:blit(0,0,sprite[x])
if x == 3 then
x = 1
end
screen.waitVblankStart(a number)
screen.flip()
end

ok this is alittle better
edit: AWW CRAP I THINK I GOT IT but now i g2 test

[Macca]

Originally Posted by youresam

That will NOT help since images and timers are part of LUAPLAYER, not LUA.

sorry my bad, is there any good documentation anywhere about this?

[youresam]

Originally Posted by macca-hacker

sorry my bad, is there any good documentation anywhere about this?

Yeah, the luaplayer wiki.

To about 3 or 4 posts up, using a variable is a BAD idea because if your program is taking its sweet time, it will make the delay between animations different. With timers running in the background, it is as accurate as possible.

[Soulphalanx]

i just wrote that up in a couple of seconds

[youresam]

Originally Posted by Soulphalanx

i just wrote that up in a couple of seconds

Thats not the point... the point is, that although it was simpler, it was a bad example to use because lets say that at certain parts of it the fps drops and the animation will be slower.

[Soulphalanx]

true, but i didnt want to think that much
but using the pointer array is probably what he wants

just change using a variable to using a timer and that should work better

[Xodiac21]

ok got a prob.

attempt to index global 'sprite' (a nil value)

heres the source

sprite[1] = Image.load("pics/sprite1.png")
sprite[2] = Image.load("pics/sprite2.png")
sprite[3] = Image.load("pics/sprite3.png")
x = 1

while true do

x = x + 1

screen:blit(0,0,sprite[x])

if x == 3 then
x = 1
end

screen.waitVblankStart(0)
screen.flip()
end

[Spirit]

Yeah, is there a tutorial on moving sprites, jumping, shooting, etc.? I really want to start working on a sidescrolling, platforming, shooting game? The tutorials I've read haven't given me much clue on this... so what are some good tutorials, or lua scripts to look at if I want to start learning this type of coding in Lua?

[Xodiac21]

Originally Posted by xodiac21

ok got a prob.

attempt to index global 'sprite' (a nil value)

heres the source

sprite[1] = Image.load("pics/sprite1.png")
sprite[2] = Image.load("pics/sprite2.png")
sprite[3] = Image.load("pics/sprite3.png")
x = 1

while true do

x = x + 1

screen:blit(0,0,sprite[x])

if x == 3 then
x = 1
end

screen.waitVblankStart(0)
screen.flip()
end

i hate being this close and not being able to figure it out!!

i think it has sumthing to do with

screen:blit(0,0,sprite[x])

the "x" is not being used as a variable maybe idk

Originally Posted by xodiac21

ok got a prob.

attempt to index global 'sprite' (a nil value)

heres the source

sprite[1] = Image.load("pics/sprite1.png")
sprite[2] = Image.load("pics/sprite2.png")
sprite[3] = Image.load("pics/sprite3.png")
x = 1

while true do

x = x + 1

screen:blit(0,0,sprite[x])

if x == 3 then
x = 1
end

screen.waitVblankStart(0)
screen.flip()
end

Change to screen:blit(0,0,sprite[1])

Not sure if you can use a variable...

[Xodiac21]

looks like u can't even use "[]" in the image load.!!!!1

guess someone else gotta show a sample

[youresam]

Dude

sprite = {}

you need to DEFINE it first!!

And, yeah, you CAN use a variable, but dont make it change the sprite EVERY frame. (The PSP gets 60 fps)

[Xodiac21]

ok my brain hurts lol. i need to sleep BYE

[Sturmeh]

Lol, can anyone help, i need to know how to rename a directory on the memory stick using lua code...

Like "ms0:/FIRST" renamed to "ms0:/SECOND" but retaining the files...

Is this possible?

[Gutya]

Originally Posted by LordSturm

Lol, can anyone help, i need to know how to rename a directory on the memory stick using lua code...

Like "ms0:/FIRST" renamed to "ms0:/SECOND" but retaining the files...

Is this possible?

We don't need two LUA help threads.

[madsoul]

help pleh phel leph!!

[Mast3r_Shak3]

Originally Posted by xodiac21

looks like u can't even use "[]" in the image load.!!!!1

guess someone else gotta show a sample

Either define it with sprites{} or change the names to something like sprites1 and sprites2

[youresam]

xigency, before you tell the program what sprite[1] and sprite[2] is, you first need to say what sprite is.

sprite = {}

that means that sprite is a table. now you may start loading the images into the table.

make sense?

[Xodiac21]

umm...can sumone jus write a sample code

[youresam]

I did....