Lua Programming Help Thread

thats a cool game..
but i dont know collision sryy...

Does anyone know how i can return a table of the RGBA values of a color?

a = color:colors()
then you have a.r a.g a.b and a.a (red, greeb, blue, alpha)

Zitat:

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Zitat von Yongobongo

Does anyone know how i can return a table of the RGBA values of a color?

---

i dont know if there are bit operations in lua. if there are, then icould write a function for you. its not hard with bits shifting.
-= Double Post =-

Zitat:

---

Zitat von youresam

a = color:colors()
then you have a.r a.g a.b and a.a (red, greeb, blue, alpha)

---

heh, that was easier ;)

for instance:

blah = Color.new(37,198,255,100)
blahcolors = blah:colors()
blahcolors.r returns 198
blahcolors.a returns 100
etc

Thanks, can i use these values to tell one of the values?
Say

Code:

---

fff = Color.new(111,234,983,255)
colorz = fff:colors()
colorz.a = alphavalue

---

Yep, colorz.a right there would be the alpha value, 255.

Alright thanks :tup: now to go try it out

Sorry for asking this, but how do you display an image for only a few seconds in C (not in lua)? None of the C developers were online, so i thought maybe both in lua and C, the function was the same.

Make a timer and blit it while the timer is under 3000 or however long you want it there
-= Double Post =-
Why isn't this working?? :(

Code:

---

color2= Color.new(110,132,255,100);

if menuOnFocus == 3 then
if pad:left() then
if sliderLocation2 > 1 then
sliderLocation2 = sliderLocation2 - 1
end
end

if pad:right() then
if sliderLocation2 < 99 then
sliderLocation2 = sliderLocation2 + 1
end

colorz = color2:colors()
color2 = Color.new(colorz.r, colorz.g, colorz.b, sliderLocation2*2.55

---

You didn't close the parenthesis on the last color.new and you didnt close all your ifthens.

Zitat:

---

Zitat von Yongobongo

Make a timer and blit it while the timer is under 3000 or however long you want it there
-= Double Post =-
Why isn't this working?? :(

Code:

---

color2= Color.new(110,132,255,100);

if menuOnFocus == 3 then
if pad:left() then
if sliderLocation2 > 1 then
sliderLocation2 = sliderLocation2 - 1
end
end

if pad:right() then
if sliderLocation2 < 99 then
sliderLocation2 = sliderLocation2 + 1
end

colorz = color2:colors()
color2 = Color.new(colorz.r, colorz.g, colorz.b, sliderLocation2*2.55

---

---

you have a semicolon beside your first color.

wow, come on. those are the easiest things to spot. cant miss stuff like that. and also, you need to start indenting. a somple tab is all it takes, and it makes the code SO much easier to read. for example, ill indent your code:

Code:

---

color2= Color.new(110,132,255,100)

if menuOnFocus == 3 then
        if pad:left() then
                if sliderLocation2 > 1 then
                        sliderLocation2 = sliderLocation2 - 1
                end
        end
end

if pad:right() then
        if sliderLocation2 < 99 then
                sliderLocation2 = sliderLocation2 + 1
        end
end

colorz = color2:colors()
color2 = Color.new(colorz.r, colorz.g, colorz.b, sliderLocation2*2.55)

---

Yeah you really shouldn't post especially even after luaplayer tells you what and where the error is...

Luaplayer didn't give an error :|
It just doesnt seem to change the Alpha Value

Yeah but someone with your history of releases I'd of thought things like this would come easy to you.

I've just posted the snippet, the actual script runs fine and i've checked over it numerous times and there doesn't seem to be an error :( oh well forget alpha

Zitat:

---

Zitat von Grimfate126

you have a semicolon beside your first color.

---

Lua supports semicolons.

Code:

---

a = 5
b = 6

---

is the same as

Code:

---

a = 5;
b = 6;

---

I have a question. For shooting i tryed using the example at Evilmana( i changed some things but still didn't like it i am still learnig lua jsut started up again) But when you shoot you can only shoot five on the screen at a time. I was wondereing how you do shooting bullets like in ATOM. My game is kind of like it but it will end up being a lot different.

Thanks Bob Hoil:)

Use a table.

And table.getn. And table.insert. And that's all anybody will probably tell you because they want you to figure it out.

Is there a way to us c/c++ code in a lua script? For instance would it be possible to modify some of the functions from Zettablade's vlib to to let them be used with the lua player, or would they have to compiled into the player itself?

You either have to compile it into luaplayer or load it as an lrx

Sorry, but I'm still a newbie, what's an lrx?

It's an extra library that lets you add more functions to your script
Ive used sysext lrx, for example that adds the ability to play .ogg, overclock the cpu, exit the application, launch static elf's etc.

Is an lrx a pre-compiled library, or is it like a script that can be edited?

Zitat:

---

Zitat von Merick

Is an lrx a pre-compiled library, or is it like a script that can be edited?

---

It's a pre-compiled library. It's basically a .prx, with the L from LuaPlayer. :|

hey can i just have a menu coded in lua so i can learn from it and study cause i am learning lua now and want a menu thank you

Look in the code snippets thread, Its sticked in this forum.

ok but is there one that will help me with this type of menu
where there are 3 menu bgs with 3 options in them start credits and quit this is designed in

and the three images are
the first one is with the arrow pionting to start second one to credits and 3rd one to quit designed in not coded is there a menu in the snippets like that

So when you highlight an option, It will display the arrow picture next to it?

kinda if you want i can post the pics

Guess what i found in the snippets thread?
Just with some minor indention ;)

Spoiler for Keep guessing...:

Code:

---

-- Menu code
-- Lua Snippets thread @ QJ

black = Color.new(0, 0, 0)
white = Color.new(255, 255, 255)
index = 1
xIcon = 0
yIcon = 0
offscreen = Image.createEmpty(480, 272)
offscreen:clear(black)
function menuCode()
screen:clear(white)

if index == 1 then
        screen:print(0, 0, "You have chosen 'Play'.", black)
                elseif index == 2 then
                        screen:print(0, 0, "You have chosen 'Options'.", black)
                                elseif index == 3 then
                                        screen:print(0, 0, "You have chosen 'Exit'.", black)
end
                end
                                        end
screen.flip()
end

function printMenu ()
        for i = 0, table.getn(menu)-1 do
        offscreen:print(10, i*15, menu[i+1], white)
        end
end

function moveIcon (direction)
screen:clear(black) -- reset/clear the screen every time the icon moves
screen:blit(0, 0, offscreen, false)
        if direction == 1 and index > 1 and index <= table.getn(menu) then
                index = index - 1
                yIcon = yIcon - 15
                else if direction == 2 and index >= 1 and index < table.getn(menu) then
                        index = index + 1
                        yIcon = yIcon + 15
                end
end

screen:fillRect (xIcon, yIcon, 5, 5, white)
screen.waitVblankStart(4)
screen.flip()
end

menu = {}
menu[1] = "Play"
menu[2] = "Options"
menu[3] = "Exit"

printMenu()

screen:blit(0, 0, offscreen, false)
screen:fillRect(xIcon, yIcon, 5, 5, white)
screen.flip()

while true do
pad = Controls.read()
if pad:start() then
        System.Quit()
        end
        elseif pad:down() then
                moveIcon(2)
                end
                elseif pad:up() then
                        moveIcon(1)
                        end
                        elseif pad:cross() then
                                menuCode()
                                end

screen.waitVblankStart()
end

---

A basic menu is not hard to make, just simply declare the amount of menu items and make something like this:

Code:

---

if pad:up() then
menu = menu - 1
end

if pad:down() then
menu = menu + 1
end

if menu > 5 then -- if menu is over the maximum amount
menu = 1
end

if menu == 1 then -- if the menu is number 1
screen:blit(0,0,arrow)
end

if menu == 2 then -- if menu is number 2
screen:blit(0,10,arrow)
end

---

and so on.

ok these are the images please no one copy these
menu1
http://i152.photobucket.com/albums/s...10594/WoC1.png

menu2
http://i152.photobucket.com/albums/s...10594/WoC2.png

menu3
http://i152.photobucket.com/albums/s...10594/WoC3.png

Zitat:

---

Zitat von Yongobongo

A basic menu is not hard to make, just simply declare the amount of menu items and make something like this:

Code:

---

if pad:up() then
menu = menu - 1
end

if pad:down() then
menu = menu + 1
end

if menu > 5 then -- if menu is over the maximum amount
menu = 1
end

if menu == 1 then -- if the menu is number 1
screen:blit(0,0,arrow)
end

if menu == 2 then -- if menu is number 2
screen:blit(0,10,arrow)
end

---

and so on.

---

I think that could should be:

Code:

---

if pad:up() then
menu = menu - 1
end

if pad:down() then
menu = menu + 1
end

if menu > 5 then -- if menu is over the maximum amount
menu = 5
end

if menu < 1 then -- if menu is below the minimum amount
menu = 1
end

if menu == 1 then -- if the menu is number 1
screen:blit(0,0,arrow)
end

if menu == 2 then -- if menu is number 2
screen:blit(0,10,arrow)
end

---

I just changed some things in it. In your code, if you go above of the 5th option in the menu, the code resets to the 1st option. It should be 5th option if the menu goes above the 5th option. Vice versa for the minimum option.

Just edit the code I posted to display your arrow instead of the arrow it makes.
Also edit it to blit the arrow on both sides.
Should be very simple, I just don't want to give you the code cause i would rather have you learn something ;)

ok thanks
-= Double Post =-
would it look something like this

code-
blue = Color.new(0, 153, 255)
orange = Color.new(155, 102, 0)
gray = Color.new(153, 153, 153)
black = Color.new(0 , 0, 0)

---Variables---

Select = 1

MaxSelect = 3

WOC1 = Image.load("images/WoC1.jpg")
WOC2 = Image.load("images/WoC2.png")
WOC3 = Image.load("images/WoC3.png")

---Loop----
while true do
pad = Controls.read()
screen:clear()

--Player decision---
if pad:down()
Select = Select + 1
end

if pad:up() then
Select = Select - 1
end

--Menu Options---

if Select == 1 then
screen:blit(0,0,WOC1)
screen:flip()
end
if Select == 2 then
screen:blit(0,0,WOC2)
screen:flip()
end
if Select == 3 then
screen:blit(0,0,WOC3)
screen:flip()
end
if Select < 1 then
screen:blit(0,0,WOC3)
screen:flip()
end
if Select > 3 then
screen:blit(0,0,WOC1)
end
screen:flip()
screen.waitVblankStart()
end

Zitat:

---

Zitat von superbatxs

I think that could should be:

Code:

---

if pad:up() then
menu = menu - 1
end

if pad:down() then
menu = menu + 1
end

if menu > 5 then -- if menu is over the maximum amount
menu = 5
end

if menu < 1 then -- if menu is below the minimum amount
menu = 1
end

if menu == 1 then -- if the menu is number 1
screen:blit(0,0,arrow)
end

if menu == 2 then -- if menu is number 2
screen:blit(0,10,arrow)
end

---

---

I think it should be:

Code:

---

if pad:up() then
menu = menu - 1
end
elseif pad:down() then
menu = menu + 1
end
elseif menu => 4 then
menu = 1
end
elseif menu <= 0 then
menu = 3
end
elseif menu == 1 then
screen:blit(0,0,arrow)
end
elseif menu == 2 then
screen:blit(0,10,arrow)
end
elseif menu == 3 then
screen:blit(0,20,arrow)
end

---

Zitat:

---

Zitat von pspdude10594

ok thanks
-= Double Post =-
would it look something like this

code-
blue = Color.new(0, 153, 255)
orange = Color.new(155, 102, 0)
gray = Color.new(153, 153, 153)
black = Color.new(0 , 0, 0)

---Variables---

Select = 1

MaxSelect = 3

WOC1 = Image.load("images/WoC1.png")
WOC2 = Image.load("images/WoC2.png")
WOC3 = Image.load("images/WoC3.png")

---Loop----
while true do
pad = Controls.read()
screen:clear()

--Player decision---
if pad:down()
Select = Select + 1
end

if pad:up() then
Select = Select - 1
end

--Menu Options---

if Select == 1 then
screen:blit(0,0,WOC1)
screen:flip()
end
if Select == 2 then
screen:blit(0,0,WOC2)
screen:flip()
end
if Select == 3 then
screen:blit(0,0,WOC3)
screen:flip()
end
if Select < 1 then
screen:blit(0,0,WOC3)
screen:flip()
end
if Select > 3 then
screen:blit(0,0,WOC1)
end
screen:flip()
screen.waitVblankStart()
end

---

does that look ok or needs work

Zitat:

---

Zitat von Anti-QJ

I think it should be:

Code:

---

elseif menu =>4 then
menu = 1
end

---

---

So if a menu option is more than 4, make the menu option 1? Or if a menu option is equal to 4, make the menu option 1? It depends on the user. You can have a menu either way. Btw, I was talking about 5 menu options. Also, you don't have to have that. Instead of

Code:

---

elseif menu =>4 then
menu = 1
end

---

you can put

Code:

---

if menu > 3 then
menu = 1
end

---

Btw, i am not sure if it needs an else if....you can just if alone.

--Double post--

Code:

---

--Variables

Select = 1
MaxSelect = 3
WOC1 = Image.load("images/WoC1.png")
WOC2 = Image.load("images/WoC2.png")
WOC3 = Image.load("images/WoC3.png")

---Loop----
while true do
pad = Controls.read()

--Player decision---
if pad:down()
Select = Select + 1
end

if pad:up() then
Select = Select - 1
end

--Menu Options---

if Select == 1 then
screen:blit(0,0,WOC1)
screen:flip()
end
if Select == 2 then
screen:blit(0,0,WOC2)
screen:flip()
end
if Select == 3 then
screen:blit(0,0,WOC3)
screen:flip()
end
if Select > 3 then
Select == 1
end
if Select < 1 then
Select == 3
end
screen.waitVblankStart()
end

---

Just a simple code cleanup. Yea, that could work. Btw, you don't need the colors, unless you use them later.