Lua Programming Help Thread

Zitat:

---

Zitat von Urameshi

no wonder the game im tryin to use keeps crashing, cause of the .gif

---

...

Luaplayer presumes PNG if the JPEG header is not found.

crud, sorry line 33 is:

Zitat:

---

function ANIM:blit(x, y, delay)

---

-= Double Post =-
just, wut do i need to change or put in animlib for it to work?
-= Double Post =-
cricket cricket, i think i made a noobish mistake
-= Double Post =-
ok, was my coding mistake THAT RETARDED?

Put all of the function

-- BLIT ANIMATION --

function ANIM:blit(x, y, delay)



self.interval = delay
self.timer:start()

if self.timer:time() >= self.interval then
self.currentFrame = self.currentFrame + 1
self.timer:reset()
end

if self.currentFrame > self.maxFrame then
self.currentFrame = 1
end

screen:blit(x, y, self.frame[self.currentFrame])

end
-= Double Post =-
ok, i fixed that, now, how would i state:
if pad:"nothing pressed"() then
...
end:Argh:

Zitat:

---

Zitat von youresam

or bmplib I made.

---

i tried bmplib, but when i start my app, it takes about 5 secs, while its doing dofile("bmplib.lua") ....

Zitat:

---

Zitat von moncristo_da_dev

-- BLIT ANIMATION --

function ANIM:blit(x, y, delay)



self.interval = delay
self.timer:start()

if self.timer:time() >= self.interval then
self.currentFrame = self.currentFrame + 1
self.timer:reset()
end

if self.currentFrame > self.maxFrame then
self.currentFrame = 1
end

screen:blit(x, y, self.frame[self.currentFrame])

end
-= Double Post =-
ok, i fixed that, now, how would i state:
if pad:"nothing pressed"() then
...
end:Argh:

---

try:

if ~pad then
...code...
end

otherwise, you will have to do something like this:

if ~pad:cross() and ~pad:circle() and ~pad:square() and ~pad:triangle()...etc. then
...code...
end

Or you can create a AnyKey() function.

Pretty sure it's pad:buttons()==0, so ~pad:buttons() or (as Grimfate said) just ~pad should work.

Zitat:

---

Zitat von LMelior

Pretty sure it's pad:buttons()==0, so ~pad:buttons() or (as Grimfate said) just ~pad should work.

---

0 is not false in lua. Any value other than false or nil is "true". And ~pad? Im pretty sure that wouldnt work, pad is a controls object, you cannot handlt it like you can in C.

for lua, what image type files does it support?
and also, if there are any exceptions for the windows version, plz tell me

PNG and JPG, this info is available on lua players website

You can always edit the luaplayer source and add more libs for more image support. Isn't hard, just go to ps2dev.org and download their libs from svn in cygwin if you have it.

Zitat:

---

Zitat von HaxxBlaster

Or you can create a AnyKey() function.

---

wut would be the code for the anykey function?

if pad:buttons() > 0 then

is that the same as saying "if not pad:whatever then"

no.
It translates to "if there is more than 0 buttons being pressed then.."

awesome thinking yoursam, you really think outside the box
-= Double Post =-
is there an if statement that checks to see what the last pressed button was?

if oldpad:button() then

so that's wut oldpad stands for lol do you guys ever wonder wtf im making to be asking all these questions?


EDIT:if this is correct: pad = Controls.read()

would this be correct: oldpad = oldControls.read()

oldpad is set to pad at the begining of every loop so it holds the old value. you could name it fish for all it matters.

Something interesting

Zitat:

---

Zitat von xpack

Something interesting

---

lol

like i said
if this is correct: pad = Controls.read()
would this be correct: oldpad = oldControls.read()
cause i keep getting the error: attempt to index global 'oldpad' <a nil value>

no.
oldpad = pad
pad = Controls.read()

..you could make it
fish = pad
pad = Controls.read()

In other words, the "old" means nothing. Its just a variable.

so how would i make it read the wut the last button pressed was?

oldpad:button()
IE: oldpad:cross() checks to see if cross was pressed

ok thanx, i keep getting the message:error: attempt to index global 'oldpad' <a nil value>

Before the main loop put oldpad = Controls.read() and in the main loop put pad = Controls.read() oldpad = pad

ok, i got that to work, what i wanted to do is if left was pressed to load an image of the player facing left after the animation of it walking left was done and if right was pressed an image of the player facing right after the animation of the player walking right was done, but now when i press left or right, it doesn't show the animation of the player walking left or right now it just shows the image of the players facing whatever key you press and moving the same direction it's facing
-= Double Post =-
...:Argh: :confused:

Figure it out.

u know wut, im actually happy that someone is finally pushing me to actually do my own code thank you yorsam for pushing me to do it my self :spsp:

Em...yeah. Lua scripters not writing their own code is what is hurting the scene.

ok, i made my own code, but it just keeps play the animation for what ever button you press here is my code:

Code:

---

dofile("animLib.lua")
standright = SS.new("jackstandright", "png", 24, 50, "images/jack/")
standleft = SS.new("jackstandleft", "png", 24, 50, "images/jack/")
runright = SS.new("jackrunright", "png", 64, 48, "images/jack/")
runleft = SS.new("jackrunleft", "png", 64, 48, "images/jack/")

oldpad = Controls.read()

player = {}
player.x = 20
player.y = 210
player.img = standright

while true do

screen:clear()

pad = Controls.read()

oldpad = pad

if pad:right() then
player.img = runright
player.x = player.x + 7
end

if pad:left() then
player.img = runleft
player.x = player.x - 7
end 

if pad:buttons() < 1 and oldpad:left() then
player.img = standleft
end

player.img:blit(player.x, player.y, 50)

screen.waitVblankStart()
screen.flip()
end

---

eww anim lib, cant help you there

...



...

*sigh*

Code:

---

player.img = standright

while true do

---

Flip those. Youre also gonna have to mod it a bit for standleft.

just look at the main loop

p.s. i made a sprite of the player image standing left or right with the same frame so it repeats and gives the illusion of an image

...........

it's not clearing the screen making player.img stand left if no buttons are pressed and if left was pressed

Code:

---

dofile("animLib.lua")
standright = SS.new("jackstandright", "png", 24, 50, "images/jack/")
standleft = SS.new("jackstandleft", "png", 24, 50, "images/jack/")
runright = SS.new("jackrunright", "png", 64, 48, "images/jack/")
runleft = SS.new("jackrunleft", "png", 64, 48, "images/jack/")

oldpad = Controls.read()

player = {}
player.x = 20
player.y = 210

while true do

player.img = standright

screen:clear()

pad = Controls.read()

oldpad = pad

if pad:right() then
player.img = runright
player.x = player.x + 7
end

if pad:left() then
player.img = runleft
player.x = player.x - 7
end 

if pad:buttons() < 1 and oldpad:left() then
screen:clear()
player.img = standleft
end


player.img:blit(player.x, player.y, 50)

screen.waitVblankStart()
screen.flip()
end

---

that's why i dont use animLib, too confusing

Why don't you just make a function to flip the image in lua and only need 1 image?

Code:

---

function flip(img)
for i = 0, img:width() do
for j = 0, img:height() do
img:pixel(i,j,img:pixel(img:width()-i,img:height()-j))
end
end
return img
end

---

That would (if i didnt mess anything up) flip the image horizontally and be used like this:

Code:

---

someimage = Image.load("image.png")
someflippedimage = flip(someimage)

---

ya, but how would i get it to load a certain image after an animation is done, like if i press left, load playerleft or if i press right load imageright after an animation

if oldpad:right() and not pad:right() then
player.img = facingright

aka if right was pressed last loop but isnt this loop then make the playerimg facing right