Lua Programming Help Thread

[youresam]

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

[moncristo_da_dev]

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

[youresam]

eww anim lib, cant help you there

...



...

*sigh*

player.img = standright

while true do

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

[moncristo_da_dev]

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

[youresam]

...........

[moncristo_da_dev]

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

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

[Urameshi]

that's why i dont use animLib, too confusing

[TacticalPenguin]

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

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:

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

[moncristo_da_dev]

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

[TacticalPenguin]

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

[moncristo_da_dev]

the problem im encountering is that it won't load the image i tell it to here is the 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 oldpad:left() and not pad:left() then
player.img = standleft
end

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

screen.waitVblankStart()
screen.flip()
end

[TacticalPenguin]

You need to put oldpad = pad before pad = Controls.read()

[moncristo_da_dev]

ok i did that:

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()

oldpad = pad

pad = Controls.read()

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 oldpad:left() and not pad:left() then
player.img = standleft
end

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

screen.waitVblankStart()
screen.flip()
end

now i get the error: lua:31:attempt to index globa 'oldpad' <a nil value>

[youresam]

Because on the first loop you assign it to pad, which is nil

[moncristo_da_dev]

but he said to put old = pad before pad = Controls.read

[youresam]

yes, but you need a first value.
do
pad = oldpad
right under oldpad = COntrols.read()

[moncristo_da_dev]

my 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()
pad = oldpad

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

while true do

player.img = standright

screen:clear()

oldpad = pad

pad = Controls.read()

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 oldpad:left() and not pad:left() then
player.img = standleft
end

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

screen.waitVblankStart()
screen.flip()
end

still doesn't make player.img standleft

[youresam]

blame animlib, it sux0rz

[moncristo_da_dev]

man, i think im cursed with noobness

[seenit]

if oldpad:left() and not pad:left() then
player.img = standleft
end

shouldn't it be

if oldpad:left() and ~pad:left() then
player.img = standleft
end
-= Double Post =-
i never seen not be called i don't even know if it can be called as not

[youresam]

Not checks if all the following code block is false. Ive never seen ~pad:left(), that works?

[seenit]

i know you can use oldpad:left ~= pad:left

idk it's been a long time since i programmed with lua

[moncristo_da_dev]

it doesn't work, i have tried a lot of things before asking you guys here

[seenit]

o ok

[Urameshi]

blame animlib, it sux0rz

i agree with that

that's why i use sprite sheets to do the animations

[Grimfate126]

i agree with that

that's why i use sprite sheets to do the animations

umm, animlib supports all sprite sheets. (v4)

:)

[moncristo_da_dev]

i agree with that

that's why i use sprite sheets to do the animations

i am using sprite sheets on animlib
-= Double Post =-
grim solve my problem please!!!!

[seenit]

@mon lose animlib make the images into their own images then just load them as there names and then it should work

[Grimfate126]

the problem im encountering is that it won't load the image i tell it to here is the 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 oldpad:left() and not pad:left() then
player.img = standleft
end

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

screen.waitVblankStart()
screen.flip()
end

try putting this line:

player.img = standright

before your main loop. also, your state system is faulty. gimme a min, ill show you how to improvise yours.

[moncristo_da_dev]

ok thanks a lot