Lua Programming Help Thread

[Merick]

hii there people, im makings some test, and i im in a way to make more eficient process i have.... ok i have a value in a variable and i want another variable.. to be a poiter of the last one...soo..if:
var1 = 10
var2 = pointer of var1... then
when i do var1 = 20.. var2 automatically takes the var1 value... how can i do that ?
also i want to do this:
var1 ={x=1,y=1}
var2 ={x=2,y=2}
var3 = {{pointer of var1},{pointer of var2}}
soo when i change the values of var1.x the var3[1].x actomatically takes the value... how to do this in lua ? the point is that i wont redefine the var3 each time the others change his value.

at the beginning of the script, set var2 = to a function:

var2 = function() return var1 end

with this, var2 should always be the same as var1

you should also be able to use a variation of this for your var3

[youresam]

at the beginning of the script, set var2 = to a function:

var2 = function() return var1 end

with this, var2 should always be the same as var1

you should also be able to use a variation of this for your var3

No, var2() will return the value of var1.

And ahrimanes you should experiment with tables, as they are always pointers.
IE:
a = {5}
b = a
b[1] = 4

...now a[1] is 4.

[Merick]

yeah, sorry that's what I meant


Can someone give me, or point me to, and explanation of how "self" works?

[youresam]

yeah, sorry that's what I meant


Can someone give me, or point me to, and explanation of how "self" works?

Its used in OOP, it returns a pointer to the object before the colon.

[Merick]

Thanks, that helps a lot actually. Well, enough to know it's the OOP tuts I needed to look into. Got what I wanted to do figured out now.

[ahrimanes]

And ahrimanes you should experiment with tables, as they are always pointers.
IE:
a = {5}
b = a
b[1] = 4

...now a[1] is 4.

ok i have tested that ad works prety well but... what i need is:

white = Color.new(255,255,255)
a = {5,5}
b = {}
b[1] = {0,a[1],a[2],0}
a[1] = 0
while true do
	screen:clear()
	screen:print(0,0,b[1][2],white)
	screen.waitVblankStart()
	screen.flip()
end

soo when i change a[1] = 0 i want the b[1][2] to be 0... thats what i need. but this just take the value and not a pointer..... is there a way to do that ?

[youresam]

soo when i change a[1] = 0 then b[1][2] = 0... thats what i need. but this just take the value and not a pointer..... is there a way to do that ?

No. But I *think* that if you pass the table a as part of table b it will be a pointer. So..
a = {5}
b = {a}
b[1][1] = 4

..does a[1] now equal 4? I think so, not sure.
But just add another line of code to change it, its not worth all this pointer complicity.

[ahrimanes]

hooo noooooooooooooooooooooooo ooo... isnt there a wayy daaammm, i need to change soomuch values and if i change one per one that will bee a lot of time lose... im actually redefinig the b table each an a value changes.. and that took some time...

[psp phd]

A simple animation is the same regardless of the language that you use. You find a way to judge time and cycle through the images based on that. Also, none of us are being paid to do this, so given that its a hobby why would you want to cheat yourself of the learning process and ask for ready made code? I guarentee you that if you learned how to animate in lua, it would help you in C.

Fair enough. But can you at least tell me this?

How do I check flash0 space? I found how to do it on the ms, but nothing on the flash.

[SG57]

Well, how would you do it on the memory stick? A sneaky way to do it would be to unassign ms0:, unassign flash0:, reassign flash0: as ms0:, get file space using method, unassign ms0:, reassign flash0: to flash0:, reassign ms0: to ms0:

?

[youresam]

But...why?

[Urameshi]

ok im still stuck with this destroying stuff, cause even though the image doesnt show, when the 2 objects collide it still restarts the game, how do i stop this????????????????

[KleptoOne]

ok im still stuck with this destroying stuff, cause even though the image doesnt show, when the 2 objects collide it still restarts the game, how do i stop this????????????????

We would have to see your code to properly debug, also what error are you getting when luaplayer restarts?

[youresam]

ok im still stuck with this destroying stuff, cause even though the image doesnt show, when the 2 objects collide it still restarts the game, how do i stop this????????????????

lol

Learn how coding works first

[Urameshi]

i dont get an error at all, and dont laugh at my code, cause i know im killing memory:

white=Color.new(255,255,255)

ball=Image.load("./Images/ball.png")
Sball=Image.load("./Images/Spike Ball.png")
square=Image.load("./Images/10x10.jpg")
bigSquare=Image.load("./Images/30x30.jpg")
stick=Image.load("./Images/190x23.jpg")
lvl=Image.load("./Images/backgrounds/silkwave black.png")
menu=Image.load("./Images/menu.png")
next=Image.load("./Images/next level.png")
stick2=Image.load("./Images/23x190.png")

ball:width()
ball:height()

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

Player={x=40,y=25,w=40,h=40,img=ball}

Enemy={x=0,y=0,w=30,h=30,img=bigSquare,}
Square={x=0,y=0,w=10,h=10,img=square}
Stick={x=0,y=0,w=190,h=23,img=stick}
Stick2={x=0,y=0,w=23,h=190,img=stick2}
--------------------------------------------------------------------------functions
function menu1()
pad=Controls.read()	
screen:blit(0,0,menu)

if pad:cross() then
level1()
end
end
------------------------------------------------------lvl1
function level1()
	while true do
	screen:clear()
Enemy.x=100
Enemy.y=100

if collision(Player,Enemy) then
screen:blit(0,0,next)
screen.flip()
screen.waitVblankStart(90)
level2()
end

movePlayer()
screen:blit(0,0,lvl,true)
screen:blit(Player.x,Player.y,Player.img)
screen:blit(Enemy.x,Enemy.y,Enemy.img)

screen.waitVblankStart()
screen.flip()
end
end
---------------------------------------------------lvl2
function level2()
	while true do
	screen:clear()
Enemy.x=300
Enemy.y=50

if collision(Player,Enemy) then
screen:blit(0,0,next)
screen.flip()
screen.waitVblankStart(90)
level3()
end

movePlayer()
screen:blit(0,0,lvl,true)
screen:blit(Player.x,Player.y,Player.img)
screen:blit(Enemy.x,Enemy.y,Enemy.img)

screen.waitVblankStart()
screen.flip()
end
end
---------------------------------------------------lvl3
function level3()
nbc=0
ncc=2
	while true do
	screen:clear()
Enemy.x=400
Enemy.y=50
Stick.x=117
Stick.y=234
Stick2.x=230
Stick2.y=0

if collision(Player,Enemy) then
screen:blit(0,0,next)
screen.flip()
screen.waitVblankStart(90)
level4()
end

if collision(Player,Stick) then
nbc=nbc+1
end
if nbc>ncc then
dofile("br.lua")
end

if collision(Player,Stick2) then
nbc=nbc+1
end
if nbc>ncc then
dofile("br.lua")
end

movePlayer()
screen:blit(0,0,lvl,true)
screen:blit(Player.x,Player.y,Player.img)
screen:blit(Enemy.x,Enemy.y,Enemy.img)
screen:blit(Stick.x,Stick.y,Stick.img)
screen:blit(Stick2.x,Stick2.y,Stick2.img)
screen.waitVblankStart()
screen.flip()
end
end
-------------------------------------------------------------------------level4
function level4()
nbc=0
ncc=3
showblock=false
lol=true
	while true do
	screen:clear()
Enemy.x=40
Enemy.y=50
Stick.x=117
Stick.y=234
Stick2.x=230
Stick2.y=0
Square.x=480
Square.y=45


screen:blit(Stick2.x,Stick2.y,Stick2.img)

if collision(Player,Stick) then
nbc=nbc+1
end
if nbc>ncc then
dofile("br.lua")
end

if collision(Player,Square) then
Player.img=Sball
end

if collision(Player,Stick2) then
nbc=nbc+1
end
if nbc>ncc then
dofile("br.lua")
end

if Player.img == Sball and collision(Player,Stick2) then
*Im Stuck here*
end



movePlayer()
screen:blit(0,0,lvl,true)
screen:blit(Player.x,Player.y,Player.img)
screen:blit(Enemy.x,Enemy.y,Enemy.img)
screen:blit(Stick.x,Stick.y,Stick.img)
screen:blit(Square.x,Square.y,Square.img)
screen.waitVblankStart()
screen.flip()
end
end
--------------------------------------------------------------------------Other Function
function collision(ob1,ob2) 
     if (ob1.x + ob1.w > ob2.x) and (ob1.x < ob2.x + ob2.w) and (ob1.y + ob1.h > 

ob2.y) and (ob1.y < ob2.y + ob2.h) then 
          return true 
     else 
          return false 
     end 
end

function movePlayer()
pad=Controls.read()

if pad:right() then
Player.x=Player.x +4
end

if pad:left() then
Player.x=Player.x - 4
end

if pad:down() then
Player.y=Player.y + 4
end

if pad:up() then
Player.y=Player.y - 4 else if not pad:up() then
Player.y=Player.y + 7
end
end
end

falling=false

------------------------------------------------------------------------Main loop
while true do
screen:clear()

menu1()

screen.waitVblankStart()
screen.flip()
end

[youresam]

i dont get an error at all, and dont laugh at my code, cause i know im killing memory:

You're not killing memory, the code just doesnt flow in a very efficient way.

[Urameshi]

you posted to say that, and not even give a piece of advice or a step into the right direction!!!!!

[youresam]

you posted to say that, and not even give a piece of advice or a step into the right direction!!!!!

..rewrite your code, the way you have it set up is very bad.

[Urameshi]

but im still stuck with it making it restart when they collide, what part of that do you not understand

[psp phd]

Fajita - I wanted to check flash0 space, for a simple theme flasher I've wrote. A friend tried it, and he didn't have enough flash0 space. Nothing bad happened, but it stopped writing files when the flash0 space ran out. So parts of the theme didn't show up. (click sounds).

I just wanted to check flash space, so my app would dummy some unneeded font files at boot, if you didn't have say, at least 2mb free. But I have actually found a way to check flash0 space. so i'm all set now :)

[KleptoOne]

you posted to say that, and not even give a piece of advice or a step into the right direction!!!!!

what level is it reseting at?

[Urameshi]

in level 3 and 4 when Player collides with Stick and Stick2 than its supposed to reset, but in level 4 when Player.img=Sball i dont want it to reset when it collides with Stick and Stick2, i want it to make Stick and Stick2 disappear

[KleptoOne]

in level 3 and 4 when Player collides with Stick and Stick2 than its supposed to reset, but in level 4 when Player.img=Sball i dont want it to reset when it collides with Stick and Stick2, i want it to make Stick and Stick2 disappear

Ok, the problem is hardcoding. You are hardcoding your collision checks with both sticks. it would be better to place the sticks into a table ie

enemylist = {}
enemylist[1] = stick1
enemylist[2] = stick2

then when you check collision set a for loop to cycle through your enemy list ie

for i = 1,table.getn(enemylist) do -- 1 to the end of your table
    if collision(player, enemylist[i]) then
        if player == sball then
            table.remove(enemylist, i)
        else
            --your other code here
        end
    end
end

Then once table.getn(enemylist) == 0. you can have victory or whatever.

[Urameshi]

thanks for helpin, unlike youresam

[youresam]

the way you have it set up is very bad.

...

Ok, the problem is hardcoding. You are hardcoding your collision checks with both sticks.

...

thanks for helpin, unlike youresam

...*sigh*

[Urameshi]

so what if he said the same thing, i got more help from him than you

[youresam]

so what if he said the same thing, i got more help from him than you

Yes, but based on what you said, I didnt help at all, which wasnt totally the case ;)

Besides, reading through that code gave me a headache

[Urameshi]

you wanna know what would give you a headache, here's a question for ya:

how do you blit an image i tried everyting here's my code:

akl=Image.load("Images/akl.jpg")

while true do
--------------------------clear the screen:clear()

scree:blit(0,0,akl,true)

screenflip()
screenwaitVblankstart()
end
end

[xmex]

Why the two ends?

akl=Image.load("./Images/akl.jpg")

while true do
screen:clear
screen:blit(0,0,akl,true)
screen.flip()
screen.waitVblankstart()
end

[k0ud]

tuhm... Simply change all 'down()' to 'left()' and all 'up()' to 'right()'. If you structure each menu option from left to right, you wont need to redo the entire menu code.

Guy above me - its cause you continually load your Start-Over.png once on it. Simply move it out of the infinite loop, not in your if statement.

mm i use this

if pad:up() and oldpad:up() ~= pad:up() then
current = current-1
end

so does it mean i need to change all of it?