Lua Programming Help Thread

[kozine]

Yup, you do this:

In your while true do loop put this code just below:

pad = Controls.read()

Now, below that put this:

if pad:cross() and pad:square then
action here
end

you can of course change cross and square to what ever buttons you want.

[Ralan]

Yup, you do this:

In your while true do loop put this code just below:

pad = Controls.read()

Now, below that put this:

if pad:cross() and pad:square then
action here
end

you can of course change cross and square to what ever buttons you want.

Thank you :) but do i need a () at the end of the other pad:button

[kozine]

Yea you do sorry:

if pad:cross() and pad:square() then
action here
end

[Ralan]

Yea you do sorry:

if pad:cross() and pad:square() then
action here
end

Thank you :)
Last question, can i limit the amount of time
you can use this?

[kozine]

Probaly but I dont know how. Sorry!

[Ralan]

Probaly but I dont know how. Sorry!

Thabk you for your help, Ill leave that out for now :)

[c5cha7]

Thank you :)
Last question, can i limit the amount of time
you can use this?

Try

controltimer=0

if pad:cross() and pad:square() and controltimer <= 10 then
--\\action here\\--
controltimer=controltimer+1
end

That should count the control's until they are pressed 10 times.
You may also need to insert another function to stop the pad
from looping really fast ;).

Sorry i just woke up so i can't exactly give a you a 110% brilliant
padtacular code snippet :icon_razz .

[Vaza]

I think u mean:

if pad:cross() and oldpad:cross() ~= pad:cross()

Add that to your if(the one c5cha7 showed),and make it suit your code(the button inputted may be different)to slow down the pad looping.

EDIT try this:

controltimer=0

if pad:cross() and pad:square() and oldpad:cross() ~= pad:cross() and oldpad:square() ~= pad:square and controltimer <= 10 then
--\\action here\\--
controltimer=controltimer  +1
end

I think thats right...
--Vaza

[EminentJonFrost]

controltimer=0

if pad:cross() and pad:square() and oldpad:cross() ~= pad:cross() and oldpad:square() ~= pad:square and controltimer <= 10 then
--\\action here\\--
controltimer=controltimer    +1
end

I've been meaning to ask this a long time: Whats with the "oldpad" and "pad" people keep using? Whats the difference?

[montrob]

controltimer=0

if pad:cross() and pad:square() and oldpad:cross() ~= pad:cross() and oldpad:square() ~= pad:square and controltimer <= 10 then
--\\action here\\--
controltimer=controltimer    +1
end

I've been meaning to ask this a long time: Whats with the "oldpad" and "pad" people keep using? Whats the difference?

Well you put oldpad = Controls.read() at the beginning of the code. It makes it so you cant hold down the button to do the action, you have to hit it repeatedly.

[Mr.Game]

quick question. Would this be the way to make the bullet stop after it hits a wall?

for e = 1,5 do
if (paintballInfo[e].x + bulletwidth > wall.x) and (paintballInfo[e].x < wall.x + wallwidth) and (paintballInfo[e].y + bulletheight > wall.y) and (paintballInfo[e].y < wall.y + wallheight) then
paintballInfo[e].firing = false
end

[soadnation]

does anyone know how to edit strings?

the value of somthing in my array is
"2DU"
when i hit left(i can do that) i want it to get rid of(subtract) the U and when i hit right i want it to put(add) the U back into the string.

[EminentJonFrost]

does anyone know how to edit strings?

the value of somthing in my array is
"2DU"
when i hit left(i can do that) i want it to get rid of(subtract) the U and when i hit right i want it to put(add) the U back into the string.

http://lua-users.org/wiki/StringLibraryTutorial
:)

That should help.

[EminentJonFrost]

quick question. Would this be the way to make the bullet stop after it hits a wall?

for e = 1,5 do
if (paintballInfo[e].x + bulletwidth > wall.x) and (paintballInfo[e].x < wall.x + wallwidth) and (paintballInfo[e].y + bulletheight > wall.y) and (paintballInfo[e].y < wall.y + wallheight) then
paintballInfo[e].firing = false
end

looks like it.
i gotta see the values for all those variables to be sure though.

[Grimfate126]

hi, im posting from india. (that was random)

quik question:

i cant download windows lua here for a personal reason, so here is my question:

is it possible to put timers in an array?? ex:

dude = {}

for dudet = 1, 50 do
dude[dudet] = Timer.new()
end

can someone test it out pls? thx.

[SG57]

yes, you can put anything into an array, as long as you define it before hand. In LUA you have nothing to worry about really, C theres syntax that you must get right before you do anything.

oh and a quick reality check thing, a flashing on and off screen means too many flippings of the draw to display buffer, correct?

[SG57]

quick question. Would this be the way to make the bullet stop after it hits a wall?

for e = 1,5 do
if (paintballInfo[e].x + bulletwidth > wall.x) and (paintballInfo[e].x < wall.x + wallwidth) and (paintballInfo[e].y + bulletheight > wall.y) and (paintballInfo[e].y < wall.y + wallheight) then
paintballInfo[e].firing = false
end

I cant tell exactly but Im sure that you have a variable for the speed of the paintball? Just make an array of speeds for each individual paintball, that way you can make a simpel if statemnet saying if speed[x] hits wall/collision, then that speed = 0, then time it for like 2 seconds to make it disappear, x++.

hope you understand it somewhat?

[EminentJonFrost]

yes, you can put anything into an array, as long as you define it before hand. In LUA you have nothing to worry about really, C theres syntax that you must get right before you do anything.

oh and a quick reality check thing, a flashing on and off screen means too many flippings of the draw to display buffer, correct?

Correct SG57, if the screen flashes too much, it means you have extra "screen.flip()"s around your script somewhere.

[soadnation]

has anyone had experience in string manipulation?

[HaxxBlaster]

has anyone had experience in string manipulation?

Manipulation how?

[soadnation]

this is what i have

"2DU"

what i want to do is have it replace the 3rd charecter in it. but instead of supplying the text i want tell it to look at a certain part of the array

[fraseyboy]

I'm making my first game in Lua, a Tag clone called TagX, which is basicly two player tag (on one psp) with fun maps, powerups stuff like that. Trust me, its fun. But it won't be fun unless I complete it, so please help me!

I need to find out a way to get collision detection (tagging) working. There are 4 sprites for each player, one for each direction.

Eg.

Player1n
Player1e
Player1s
Player1w

Player2n
Player2e
Player2s
Player2w

What I want to do, is make it so that when a player goes over another player, they swap sprites so that the player1 is now player2 and the player2 is player1 for every angle. If I didnt make it so they change directions it would be easy, but it has to swap for EVERY sprite in every direction.

Can anyone help me? :mrgreen:

[EminentJonFrost]

how about this:

Player = { Player1 = { n = Image.load("image"), e = Image.load("image"), s = Image.load("image"), w = Image.load("image") }, Player2 = { n2 = Image.load("image"), e2 = Image.load("image"), s2 = Image.load("image"), w2 = Image.load("image") } }

x = 1

if [player1 and 2 meet] then
if x == 1 then
x = 2
elseif x == 2 then
x = 1
end
end

screen:blit(player_x, player_y, Player[x].n) -- when the 'x' changes, the sprites used will change.

Do you understand that?

[fraseyboy]

Sort of...

How would I do 'the IF Player1 and player2 meet' thing?

[EminentJonFrost]

Um... Not really....

How would I do the IF Player1 and player2 meet?

dont get it? you may need to learn a bit more then.

as for the two players meeting:

if player1_x == player2_x and player1_y == player2_y then

in words, that 'if' statement is:
If player1 is on the same 'x' point and the same 'y' point as player2 then...
[the code i showed before]

[fraseyboy]

dont get it? you may need to learn a bit more then.

as for the two players meeting:

if player1_x == player2_x and player1_y == player2_y then

in words, that 'if' statement is:
If player1 is on the same 'x' point and the same 'y' point as player2 then...
[the code i showed before]

Ohhh i think i get it now... I'll try it and see.

[fraseyboy]

Hmm. It says 'attempt to index global ?, a nil value'.

Its on line 157 and that appears to be the...

screen:blit(player_x, player_y, Player[x].n) bit....


Where does Player_x and Player_y come from?


Heres my code BTW: http://pastebin.com/754753

[SG57]

<LI class=li2>-- Player Coordinates

<LI class=li1>x1 = 45
<LI class=li2>y1 = 34
<LI class=li1>x2 = 415
<LI class=li2>y2 = 240
 

I found this in your code, looks to me like the co-ordinates for the player, and there not in use because?

[fraseyboy]

<LI class=li2>-- Player Coordinates

<LI class=li1>x1 = 45
<LI class=li2>y1 = 34
<LI class=li1>x2 = 415
<LI class=li2>y2 = 240
 

I found this in your code, looks to me like the co-ordinates for the player, and there not in use because?

where'd you get them from? I can't see them anywhere in my code...

[SG57]

Well i got it from that luabin crud, i coopied and pasted, but look past the HTML junk to see it, imtoo lazy to do it myself ;-)