Lua Programming Help Thread

[Nielkie]

I'm not (Well, not in any recent programs), I've just seen it used in a few examples, and was curious is all. Thanks.

[dan369]

I just need an quick explaintion of what this does cause it don't have an clue

 
colour = col:pixel(mar.x + 2, mar.y + 15)

i don't understand this, and have never used this function

[TurtlesPwn]

someimagenameixel(x,y) returns the color of the pixel at the x,y coordinates in the image someimagename
someimagenameixel(x,y,color) sets the pixel in the image someimagename at coordinates x,y to the color color

[CoMbiNa]

What's wrong with my code?

--if currentlySelectedLineNumb er = 1 and pad:cross() then
--Code goes here
--end

--if currentlySelectedLineNumb er = 2 and pad:cross() then
--Code goes here
--end

if currentlySelectedLineNumb er = 3 and pad:cross() then
break
end

My menu works perfectly without this, so everything is configured alright.
This is the error I get:
'then' expected near '='

[TurtlesPwn]

when comparing one number to the other use ==
when setting one value equal to another use =
therefore in an if clause, you must use if somevariablename == somenumber, not =

also tonight ill be able to help you more on msn

[CoMbiNa]

when comparing one number to the other use ==
when setting one value equal to another use =
therefore in an if clause, you must use if somevariablename == somenumber, not =

also tonight ill be able to help you more on msn

Thanks it worked!
And I don't know when it's day or night in your country, so I'll just be online untill u get there

You're a great teacher btw

[dan369]

Would something like this world work?

 
colour = col:pixel(mar.x + 2, mar.y + 15) 

if colour = red then mario.x = oldx  
end
if colour = blue then mario.y = oldy 
end

Because i've used dofile ( experimenting ) with this but every time i use oldx, oldy it never works :?

[TurtlesPwn]

again, if colour ==, not =. Also, I assume you have red and blue declared as Color.new(255,0,0) and Color.new(0,0,255)

[CoMbiNa]

Aww me and my problems...

I try to use danzeff osk, and it either writes in black, or not at all.
This is my code:

screenrint(5,5,typingstring, white)

keyboard.process(2,105,pa d,oldpad)
typingstring = keyboard.typeToString(typ ingstring)

Of course I got the color white installed, and here are a few other lines:

dofile("keybd.lua")

typingstring = ""
displaykeyboard = true

I don't get any error, but when I use the OSK it doesn't write.
(which means all the variables are ok and the code is stable, which is why I didn't gave u the whole code).

I will soon check if it writes in black (screen:clear(white)).

Oh and penguin I haven't worked on it since we talked coz I ****ed up my leg... which is why I have to ask here

[FaT3oYCG]

make sure typingstring is above while true do

[CoMbiNa]

of course it's above.
but it's in the main loop, the loop of the menu.
Maybe I should put it in the loop of the certain part?
(above while true do)

[CoMbiNa]

No, I tried changing background color to white, and moving the variables to that certain loop.

[dan369]

again, if colour ==, not =. Also, I assume you have red and blue declared as Color.new(255,0,0) and Color.new(0,0,255)

Oh my Bad, i typed it out wrong. I do know it should be == just to stay:)
yes i do have the colours declared lol
= means declaring variables
== declares arguments against variables e.g

if whatever == 0 then
whatever = 1 
end

just to clarify

[Moose]

Oh my Bad, i typed it out wrong. I do know it should be == just to stay:)
yes i do have the colours declared lol
= means declaring variables
== declares arguments against variables e.g

if whatever == 0 then
whatever = 1 
end

just to clarify

Yeah, using a '==' verifies something (sees if it is true), whereas '=' changes the variable to, in this case, 1. I'm not sure if it works in Lua, but using '!==' checks to see if something is not true:

if whatever !== 0 then
whatever = 0
end

Or, you could do:

if whatever == 1 then
whatever = 0 
end

You see? :)

[SG57]

Moose_Island - your explanation is worded somewhat awkward, and wrong about the 'not equal' operator.

The '=' symbol alone is used to assign the preceding variable with the following value where the '==' symbol is used to compare the preceding and following variables if they are true (of the same data type), returning true or false respectively.

With C's syntax, the != operator is the same as saying 'not equal'. In Lua the ~= operator is the equivalent of != in C.

[CoMbiNa]

Hey I write this again, because it got lost in those 872 pages.

What's wrong with my code?

--if currentlySelectedLineNumb er = 1 and pad:cross() then
--Code goes here
--end

--if currentlySelectedLineNumb er = 2 and pad:cross() then
--Code goes here
--end

if currentlySelectedLineNumb er = 3 and pad:cross() then
break
end

My menu works perfectly without this, so everything is configured alright.
This is the error I get:
'then' expected near '='

[michaelp]

It's "==" instead of "=".

[dan369]

It's "==" instead of "=".

michaelp is right thats the promblem, basically what the first posts on this page is about lol
look at the other posts above yours.

Also does Mp3me.eos() work???
cause i try to say

 
if the end of song (Mp3me.eos() ) is true (it uses true/false to determine ) then
--whatever 
end

[SG57]

Still dan?

Make sure you are constantly polling, a song is loaded into mp3me and '--whatever' is actual code that will somehow signify the if clause is true.

[dan369]

Still dan?

Make sure you are constantly polling, a song is loaded into mp3me and '--whatever' is actual code that will somehow signify the if clause is true.

huh?? i dont get that but yess i have loaded the song, plays fine. All i want is just to screen print song is finished
currently what i have

 
if Mp3me.eos() then
screen:clear()
screen:print(10,10,"Song Finished",white)
end

[Nielkie]

LuaplayerHM is retarded and returns strings: "true" and "false"

[dan369]

so would i pu this instead

 
if Mp3me.eos() == true then
screen:clear() 
screen:print(10,10,"Song Finished",white) 
end

[CoMbiNa]

LuaplayerHM is retarded and returns strings: "true" and "false"

Who are u talkin to?

[FaT3oYCG]

so would i pu this instead

 
if Mp3me.eos() == true then
screen:clear() 
screen:print(10,10,"Song Finished",white) 
end

Mp3me.eos() returns its values as "true" and "false" with the quatoation marks, because they are strings, i dont know why they are returned like that because they should just be boolean values, which would make it easier because if we needed them as a string we could use tostring()

[SG57]

I've looked at the source and it's because he doesn't know how to return a boolean embarrassingly enough (for the record, with every 'me' release, that luaplayer is getting slower and bigger meaning slower and bigger games if any)

[homemister91]

I've looked at the source and it's because he doesn't know how to return a boolean embarrassingly enough (for the record, with every 'me' release, that luaplayer is getting slower and bigger meaning slower and bigger games if any)

I can return boolean's now. just remember guys i ave only been learning C++ for 5 months now. If you want them to return boolean values then i can do that.

BTW i am doing my best to keep the LuaPlayer size to a minimum. To try to keep it fast.

[CoMbiNa]

First of all thanks HomeMister for the quick help.

Now, I got this interesting issue:
[QUOTE]screenrint(5,20,"You should take in "..(typingstring*2.1) .." grams of protein each day", white)[/QUOTE
I got an osk installed and everything.
Now, the only way this line will work, is to configure typingstring as a number.
I did this:
typingstring = "0"
Now it works, but the users gotta delete the 0 before they start to write their own number.
(if I set typingstring = "" then the value wouldn't be a number).

Is there any way that the users can start writing from nothing?
instead of having to delete my number before?
(If I set the intial value of typingstring to nothing, then it's not a number and the luaplayer crashes).

[FaT3oYCG]

just put

typingstring = ""

and then to convert it to a number use

number_choice = tonumber(typingstring)

p.s. use code tags

[code]

 and then the second has a / before the word code [ /-Here code]

[CoMbiNa]

just put

typingstring = ""

and then to convert it to a number use

number_choice = tonumber(typingstring)

p.s. use code tags

[code]

 and then the second has a / before the word code [ /-Here code]

where to put

number_choice = tonumber(typingstring)

and what to do with it?

i'm using danzeff osk btw

[FaT3oYCG]

omg this thing is stupid it wont let you edit posts and it always posts the same thing twice meh arg grr

put it where you need the number, i take it that you want the user to enter a number well

number_choice = tonumber(typingstring)

is the number it will convert the data from the osk into a number