Lua Programming Help Thread

[Altair]

Thats because it only goes through the function if you hold X. And the function distracts/adds from y only once and only if you hold X. If you want to make it do a full jump, then you can add a special variable, and if that var is say 1, then you let it do your functon. If its 0 then it wont. I hope its clear enough, im kinda drunk lol>

[lui2603]

Lol thanks, I put jump = false and in the jump function I put if jump==true then ... the rest of the function then jump = false so it stops jumping.... and if pad:cross() then jump = true .. works now thanks Alatair!

[soadnation]

of that was the solution to the problem. now i just have to do collision and what to do when the poles reach the endof the screen. ill probly need help somewhere in there

[Altair]

sure no prob. I'll try and help anybody who i can help!

[Glynnder]

What happened is I blitted the cursor at X, Y and it said that the value was nil

if i said X = 100, Y = 100, it didn't move even though the code said X = X+1, so... im confused

[Altair]

Heres what i used for my cursor:

mouse=Image.load('mouse.png')
x=240
y=136
while true do
screen:blit(x, y, mouse, 0, 0, mouse:width(), mouse:height())
pad = Controls.read()
		dx = pad:analogX()
	        if math.abs(dx) > 32 then
	                x = x + dx / 32
	        end

	        dy = pad:analogY()
	        if math.abs(dy) > 32 then
	                y = y + dy / 32
	        end
screen.waitVblankStart()
	screen:flip()
end

This works perfectly for me. Dont just copy it, but also see if you understand it.

[lui2603]

I need a little help getting my gun to work in lua

if pad:cross() then
shootright()
end

how would I make it so it does shootright() when I just tap X instead of while I hold it?
is it a different command to make it read the pad or something?
I already tried using variables like..

shootis = false

function shootright()
if shootis==true then
if shoottime>=1 then
bulletx = bulletx + 50
shoottime = 0
shoottime = shoottime + 1
end
end
end

if pad:cross() then
shootis = true
shootright()
end

But it still meant I had to hold in the cross button...
so does anyone know if there is a way to make it happen on 1 tap of the cross button??
thanks...

[c5cha7]

I need a little help getting my gun to work in lua

if pad:cross() then
shootright()
end

how would I make it so it does shootright() when I just tap X instead of while I hold it?
is it a different command to make it read the pad or something?
I already tried using variables like..

shootis = false

function shootright()
if shootis==true then
if shoottime>=1 then
bulletx = bulletx + 50
shoottime = 0
shoottime = shoottime + 1
end
end
end

if pad:cross() then
shootis = true
shootright()
end

But it still meant I had to hold in the cross button...
so does anyone know if there is a way to make it happen on 1 tap of the cross button??
thanks...

Thats pretty messed up lol...
I Will see what i can do for ya :mrgreen: .
This is pretty simple for what your asking
so if i cant do it today then someone else will
probally sort this out asap lol..

[lui2603]

Lol, thanks

[c5cha7]

if pad:cross() then
shootright=true
end

if shootright==true then
bulletx = bulletx + 50
end
if shootright==false then
end

Maybe that will work?
But i really need a more detailed
destriction/code for this to understand...
I Will make a better version soon, cause
thats just a small test lol. ;)

[lui2603]

Hm it won't work because the bullet will only go to bulletx + 50
that's why I had shoottime going in a loop so that bulletx will keep adding 50..
the thing is if I have it on a loop which is started by pressing x it wont keep going unless I hold in x all the time...

edit: also does anyone know how I make lua read from a tileset in a single .png file? like if each tile was 10 pixels wide and 10 pixels long?

[Altair]

Maybe this willl work (i did it really fast, maybe i need to adjust some things):

function shootright()

for shoottime=1,10 do
bulletx = bulletx + 50
shoottime = shoottime + 1
end

end

if pad:cross() then
shootright()
end

About the tiles:
Just load them all from that picture. You can see how at the basic LUA tutorial. Im sorry i forgot the site and im not at home. Its something like: add 10 pixels eachtime you load a part from that picture. Ill look up the site when im back home.

Altair

[Glynnder]

AltairHeres what i used for my cursor:
Code:

mouse=Image.load('mouse.p ng')x=240y=136while true doscreen:blit(x, y, mouse, 0, 0, mouse:width(), mouse:height())pad = Controls.read() dx = pad:analogX() if math.abs(dx) > 32 then x = x + dx / 32 end dy = pad:analogY() if math.abs(dy) > 32 then y = y + dy / 32 endscreen.waitVblankStart () screen:flip()end

This works perfectly for me. Dont just copy it, but also see if you understand it.

Cheers its quite similar to mine and i think i know where I'm going wrong!

thanks

[lui2603]

My game was working just fine but after I added this peice of code:

if pad:up() and spritenum = car[1] then
direction = "up"
spritey = spritey - 1
end
if pad:down() and spritenum = car[1] then
direction = "down"
spritey = spritey + 1
end
if pad:right() and spritenum = car[1] then
direction = "right"
spritex = spritex + 1
end
if pad:left() and spritenum = car[1] then
direction = "left"
spritex = spritex - 1
end



it gave me an error saying "'then' expected near '='"
anyone know what's wrong with it?

[Altair]

oo-oo, i know! To check if something is equal you have to use "==", not "=". So you have to change those.
For example: "if pad:up() and spritenum = car[1] then", becomes "if pad:up() and spritenum == car[1] then"

[lui2603]

Oh yeah, didn't see that... Cheers Altair!

[InhumanElmo]

How can I change the sensitivity of the buttons. Its going too much.

[soadnation]

ive started doing my collision(checking pixels) and i get this error

Index.lua:201: An argument was incorrect

these are the things that i added

TR = image:pixel(XAxis+48, YAxis)
TL = image:pixel(XAxis, YAxis)
BR = image:pixel(XAxis+48, YAxis+64)
BL = image:pixel(XAxis, YAxis+64)
TRcolor = TR:colors()
TLcolor = TL:colors()
BRcolor = BR:colors()
BLcolor = BL:colors()

im pretty sure im just doing it wrong because all i have to gooff of is that command. nothing else(like how it works)

[Altair]

@InhumanElmo
Do you mean for the Analogstick?

@Soadnation
What line is line 201? I think your code is correct, but i have never used it though.

[InhumanElmo]

No I mean for the actual dpad buttons. Is it possible? I need it for scrolling through numbers but it always goes too fast and skips numbers!

[Altair]

well you can say "if oldpad~=pad then" and then your code there. Where you add "oldpad=pad" at the end of your controlcheck part. What it does is check if your controls are the same as the last one and if so then it doesn't do anything. If they are different then it reads the controls. If it isnt clear i can post some code.

You can also put some WaitVBlank's after it. Then it has a pause and goes slower.

[InhumanElmo]

The Vblanks work. Thanks alot!

[soadnation]

line 201 is trhe first one

[Altair]

np!

@Soadnation
Where you have "image" you have to write the name of YOUR image. So if its background it becomes "backgroundixel(x,y,)". Or if you want it of the whole screen its "screenixel(x,y)".

[soadnation]

thanks that helped alot. now i got the collision working*when it collides it says somtyhing) just have to change that to do somthing when they colide

[lui2603]

How would I make it do a different thing if X is pressed if it already does something else?
at the moment I have X shooting

pad = Controls.read()

if pad:cross() then
shoot()
end

*some more code to make sprite change*

then after
newpad = Controls.read()
if newpad:cross() then
*something else*
end


but when I press cross through newpad it still shoots...
end

[Altair]

Hmm never tried that. Maybe you can just make a variable for that like:
pad = Controls.read()

if pad:cross() then
whatever=1
shoot()
end

*some more code to make sprite change*

then after

if pad:cross() and whatever==1 then
*something else*
end


The thing is you should have a puase in between i think, because otherwise it will do it immediately afterwards.

[lui2603]

Ok I done it now.

if pad:cross() and spritenum==sprites then
shoot()
end
if pad:cross() and spritenum==carnum and direction=="up" then
spritey = spritey - 5
end

[Altair]

and it works?

[lui2603]

Yeah... thanks for the help but just after posting I realised I could do it this way

Oh and if anyone knows how to do this, help would be really appreciated! I've been trying for so long to get it working...
I'm trying to get the lua script to read from a text file (map.txt) and have the numbers or letters which are in map.txt assigned to a table in my script.

So if i had

Tile = {}

Tile[1] = Image.load("grass.png")

and had "G" in the map.txt so that if I put

GGGGGG
GGGGGG

It would do 2 lines of the same image repeated...

thanks if anyone can help.

edit: Could somebody maybe upload an lua script which only has the code and map?