Lua Programming Help Thread

[yumCOOKIEZZ]

netlib isnt running right now though...want me to turn it on..?

And SG57- lua is different from C in that it doesnt support define's, so what is received will probably be best to just compare to a string.

Eh. I'm not going to create a networked game yet. If I did it would me some massive game and I just started LUA so I should probably try and understand the language first.

[Bob Hoil]

thanks.you put a r in there by the way:)

[youresam]

Are there any tutorials on how to use fonts? I have never used them and i am going to use a new font instead of the default one in lua player. I know how to load them(very easy) i just don't know how to make my text use the font.

Ever thought of looking at luaplayer.org where it fully documents every Lua Player function?

[yumCOOKIEZZ]

Random question: In the future if I ever become as '1337' as some of the people around here and decided to make something online on my own server, what would I need, and is it possible to get a free server. I am an incredible cheap person. I don't like to use money, mainly because I don't have a job and paying for a server would be hard for me.

Offtopic: Wow, my username sucks.

[youresam]

Um... http://youresam.com/netlib

Thats all you need to easily make an online game. And I am hosting the netlib server, so its all set up.

[yumCOOKIEZZ]

Kay. I'll try and set it up and see if I can...not fail at this ^_^

Thanks for the help.

(woo. Last time you will hear from me for another 16 hours =D)

[youresam]

Theres literally nothing to set up.. just incluide the file and put dofile("netlib.lua") and youre done.

But the server I have is still offline so it wont work.

[yumCOOKIEZZ]

I'll work on a server later. If I actually make this game well then I might put some online into it and try and get a small server for it. Something within my price range....5 dollars to free. (Any idea on where I can find a cheap server? If not then I'll just actually work this summer and get money.)

[PSPJunkie_]

Random question: In the future if I ever become as '1337' as some of the people around here and decided to make something online on my own server, what would I need, and is it possible to get a free server. I am an incredible cheap person. I don't like to use money, mainly because I don't have a job and paying for a server would be hard for me.

Offtopic: Wow, my username sucks.

1337? That was a joke right?

[yumCOOKIEZZ]

Yes.

[youresam]

I'll work on a server later. If I actually make this game well then I might put some online into it and try and get a small server for it. Something within my price range....5 dollars to free. (Any idea on where I can find a cheap server? If not then I'll just actually work this summer and get money.)

I'm sitting here telling you that I HAVE CREATED A SERVER and anyone is FREE TO USE IT and it has a FULLY FEATURED API...and you keep ignoring me.

[yumCOOKIEZZ]

Yes I understand but all the cool kids host their own servers.


New question: How do I make the pictures animate, so when I am moving left a new picture will come up. The person just kinda sliding around to move is lame.

Annnd now I really leave for 16 hours.

[youresam]

Yes I understand but all the cool kids host their own servers.

:Argh:

[Urameshi]

youresam, just take it easy

[Merick]

lolz... :) cool kids.. own severs...:ROFL:

[myschoo]

Yes I understand but all the cool kids host their own servers.


New question: How do I make the pictures animate, so when I am moving left a new picture will come up. The person just kinda sliding around to move is lame.

Annnd now I really leave for 16 hours.

client != server

[hallo007]

lol cool kidzz ,
better thank youresame and use it

[Grimfate126]

Yes I understand but all the cool kids host their own servers.


New question: How do I make the pictures animate, so when I am moving left a new picture will come up. The person just kinda sliding around to move is lame.

Annnd now I really leave for 16 hours.

you have trouble spelling cookie. i doubt you'll be able to make/host a server. listen to what youresam says.

[yumCOOKIEZZ]

>.< I was kidding about the cool kids. And how do I have spelling issues o.O. I checked and...nothing seems to be spelled wrong there.

So...Anyone wanna info me up on the animation thing.

>.> Didn't mean to cause head banging against a brick wall. I just kinda ask questions. Thank you youresam.

[ahrimanes]

hi there people... im having some trubles whit table.remove()... somthing weird hapen... letme explain: im working whit oop, and in this case the objects are bulets, soo i have this code:

bullets = {}
bullet = {}
metabullet = {}
function bullet:New(x1,y1,speed1,angle1,box) 
  x = x1
  y = y1
  angle = angle1
  speed = speed1
  life = 1
  radius = -1*box[3][4]
  return(setmetatable({X = x, Y = y, Radius = radius, Angle = angle, Speed = speed,Life = life}, metabullet))
end 
function bullet:updt(Index) 
	died = false
	if self.Life > 0 then
		oldx = self.X
		oldy = self.Y
		if self.Y < self.Radius or self.Y > 272 - self.Radius or self.X < self.Radius or self.X > 480 - self.Radius then
			self.Life = 0
			Angle = self.Angle *200
			Angle = math.random(Angle-100,Angle+100)
			Angle = Angle /200
			for i = 1, 2 do
			particles[table.getn(particles)+1] = particle:New(self.X,self.Y,math.random(4,self.Speed),Angle,Plane4x4,255,220,0,1)
			end
			table.remove(bullets,Index)
	              end
		self.X = self.X-math.sin(self.Angle)*self.Speed
		self.Y = self.Y-math.cos(self.Angle)*self.Speed
		screen:fillRect(self.X-self.Radius,self.Y-self.Radius,self.Radius*2,self.Radius*2,blue)
	else
		table.remove(bullets,Index)
	end
end
metabullet.__index = bullet

soo to create a new bullet and put it on a array i use:

bullets[table.getn(bullets)+1] = bullet:New(hero.X,hero.Y,20,hero.bulletangle+.02,Plane10x20)

soo each time i do this a new item in bullets is creates and it holds a bullet object.
soo to update the bullets i do:

		---------------
		-- bullets --
		---------------
		x = 1
		while x <= table.getn(bullets) do
			bullets[x]:updt(x)
			x = x + 1
		end

where x is the index bullet to update, and if the bullet die then use the same x to remove....whit this line table.remove(bullets,Inde x) in the bullets:updt function...
the thing is that when i shut some bullets.. tey work good, but when all of them die, i cant shot one more time... this is when im roning the code directli on psp.... when i run it on lua windows, it letme create asmany bullets as i want but when i shut left... and the bullet die in the wall, i got a nil index value.... wyyyy ???... is there somthing im missing on the table.remove thing... i read that this function remove an array item and corp the other one.. so if i remove index 1 the one that uses tu be 2 is now 1 and soo whit the others... im veryy worried about this,, coss is the way i wanted to optimise som code... but got this trouble.... pleaseeee some bodyy help...

[Merick]

I had a similar problem, it's caused by a bug in the table.remove function. This was fixed in the latest lua source, however some versions of the Lua Player that are floating around still used the older version of the lua sources.

[youresam]

>.> Didn't mean to cause head banging against a brick wall. I just kinda ask questions. Thank you youresam.

Yeah sorry... I was gonna change it after I posted it because it seemed a bit rude...but I couldnt see my post so I thought it didnt post...bleh?
-= Double Post =-

I had a similar problem, it's caused by a bug in the table.remove function. This was fixed in the latest lua source, however some versions of the Lua Player that are floating around still used the older version of the lua sources.

You mean lua 5.0.2?...everything below Lua Player .19?

[Bob Hoil]

green = Color.new(0,255,0)
white = Color.new(255,255,255)
grass = Image.load("grass.png")
tree = Image.load("tree.png")
no = Image.load("no.png")

collision=false

bgimg = Image.createEmpty(480,272)

for a = 0, 14 do
	for b = 0,8 do
		bgimg:blit(a*32, b*32, grass)
	end
end

bgimg:blit(312,228,tree)
bgimg:blit(400,200,tree)
bgimg:blit(150,150,no)
bgimg:blit(300,28,tree)
bgimg:blit(30,80,no)
bgimg:blit(255,100,no)

bulletimg = Image.createEmpty(4,4)
bulletimg:clear(Color.new(0,255,0))
bulletimgwidth = bulletimg:width()
bulletimgheight = bulletimg:height()

blockimg = Image.load("deer.png")
blocks = {}
blocks[1] = {x = 10, y = 100, height = blockimg:height(), width = blockimg:width()}

player = {x = 200, y = 50, w = 32, h = 32, oldx = 200, oldy = 50, img = Image.load("player.png"), health 

= 100, s = 4}

playerHeight = 32
playerWidth = 32

score = 0

radius = 25
speed = 5
degree = 0

bullet = {}

function runbullets()
	numbullets = table.getn(bullet)
	for i = 1,numbullets do
		bullet[i].x = bullet[i].x + bullet[i].xs
		bullet[i].y = bullet[i].y + bullet[i].ys
		screen:blit(bullet[i].x,bullet[i].y,bulletimg)
		if bullet[1].x > 480 or bullet[1].x < 0 or bullet[1].y > 272 or bullet[1].y < 0 then
			table.remove(bullet,1)
			break
		end
	end
end

function firebullet(_xs,_ys)
	table.insert(bullet, {x = player.x, y = player.y, w = bulletimgwidth, h = bulletimgheight, xs = 

_xs, ys = _ys})
end

function collisionCheck(object)
if (player.x + playerWidth > object.x) and (player.x < object.x + object.width) and (player.y + 

playerHeight > object.y) and (player.y < object.y + object.height) then
return true
end
end

function runblocks()
	degree = degree + speed
	radian = (degree/180)*math.pi
	for i = 1, table.getn(blocks) do
		blocks[i].x = 240+math.cos(radian)*radius
		blocks[i].y = 136-math.sin(radian)*radius
		screen:blit(blocks[i].x,blocks[i].y,blockimg)
		if collisionCheck(blocks[1]) then
			player.health = player.health - 5
		if collisionCheck(bullet[1]) then
			blocks[1]=false
		end
	end
end
end

function newblock(x,y)
	table.insert(blocks,{x = _x, y = _y, w = blockimgwidth, h = blockimgheight})
end

while true do
	pad = Controls.read()
	player.oldx = player.x
	player.oldy = player.y
	screen:clear()
	screen:blit(0,0,bgimg)

	screen:print(150,10, "Score:" .. score,white)
	screen:print(10,10, "Health:" .. player.health,white)

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

	runbullets()

	collisionCheck(bullet[1])

	collisionCheck(blocks[1])

	runblocks()

	if pad:left() then
		player.x = player.x - player.s
		if player.x < 0 then player.x = 0 end
	elseif pad:right() then
		player.x = player.x + player.s
		if player.x > 480 - player.w then player.x = 480 - player.w end
	elseif pad:up() then
		player.y = player.y - player.s
		if player.y < 0 then player.y = 0 end
	elseif pad:down() then
		player.y = player.y + player.s
		if player.y > 272 - player.h then player.y = 272 - player.h end
	end

	if pad:cross() and not oldpad:cross() then
		firebullet(0,10)
	elseif pad:triangle() and not oldpad:triangle() then
		firebullet(0,-10)
	elseif pad:circle() and not oldpad:circle() then
		firebullet(10,0)
	elseif pad:square() and not oldpad:square() then
		firebullet(-10,0)
	end

	screen.waitVblankStart()
	screen.flip()
	oldpad = pad
	if pad:start() then break end
end

I get the following error: Error: game.lua:64: attempt to index local 'object' (a nil value)

I have changed a few things but i still get the error. This is the first time i have gotten this error.

[ahrimanes]

I had a similar problem, it's caused by a bug in the table.remove function. This was fixed in the latest lua source, however some versions of the Lua Player that are floating around still used the older version of the lua sources.

hooo my... soo in new vercion of lua. its fiexd... but is there a new lua vercion that uses gu.lookat funcion?--- cince im using this in my code.. please,, if someone know about one tellme.. or... can some one make a mod.. that holds the bug fix and gu.lookat ?... :Cry: pleaaseeee..

[youresam]

theres lots

[TacticalPenguin]

Bob-You're trying to do a collision with something that doesn't exist.

[Batman-Beyond]

how can i get lua games if i have 3.11????

[youresam]

how can i get lua games if i have 3.11????

Ask Robin-Beyond

[Batman-Beyond]

im serious i dont no nothin about nothin i never even got an homebrew game on my psp in my life!!!!!!!!!

[Bob Hoil]

OK thanks tactical i will fix it.
-= Double Post =-
Ok if i changed bullet[1] to bullet(that is the table name) i get attempt to compare nil with number. I am not sure how to do the collision for the bullet. I got everything else like the health and everything. This one is giving me problems though.