Lua Programming Help Thread

[Grimfate126]

Ok im assuming you understand SG57's explanation of why it moves to the right and then stops at 450.
About the boolean thing: a boolean is a variable that can either be "true" or "false".
So lets say you have a variable called "moveleft". While you move to the right, its false. When you are at 450 you set it to true. So you say:

if x == 450 then
moveleft=true
end

Then when its true you say:

if moveleft==true then
x=x-2
end

EDIT: Damn you Grimfate, grrrr!

lol, ive been damned many times before

[pspsalv2]

yeah i understand that i have it in a loop and a bool is very simple so thanks for your help Grimfate126, SG57, Access_Denied and Altair all of your help is greatly appreciated!

[Grimfate126]

yeah i understand that i have it in a loop and a bool is very simple so thanks for your help Grimfate126, SG57, Access_Denied and Altair all of your help is greatly appreciated!

no prob. im bored anyway so ask if u have any more!

[Access_Denied]

I see now! I misread the code. At first I thought that you were doing this so that if you press left or right it moves left or right. But now I see you just want the image to move back and forth across the screen. I had problems with this before. What I did was make it so that if the images collided with a side, it would start moving. Something like:

function Bounce()
if image.x == 450 then
image.x = image.x - 2
end
if image.x == 0 then
image.x = image.x + 2
end

while true do
screen:blit(image you want to blit)
if image.x >0 and image.x < 450 then
image.x = image.x + 2
end
if image.x == 450 then
Bounce()
end
screen.waitVblankStart()
screen.flip()
end

This would make it so as soon as the loop start it start moving right. But when it hit the 450 mark it starts moving left. Then when it hits 0 it moves right again. It will keep moving until you put in a line that stops it.

I think I'm on the right track, but if I'm not, disregard everything I say. :)

EDIT: I spent so much time typing the code I didn't realize that someone already answered your question. Oh well.

[mark.sparky]

hey here is the very basiz starting code for the startmenu of my game:

white = Color.new(255,255,255)
black = Color.new(0,0,0)
orange = Color.new(255,102,0)
menu = Image.load("startmenu.png")

screenwidth = 480
screenheight = 272

while true do
screen:clear()
screen:blit( 0, 0, menu, false)
screen:print(170,70,"Start",white)
screen.waitVblankStart()
screen.flip()
end

the main thing is when i run it in lua player for windows all i see is a blank screen. Can you see any reason for this

[Grimfate126]

hey here is the very basiz starting code for the startmenu of my game:

white = Color.new(255,255,255)
black = Color.new(0,0,0)
orange = Color.new(255,102,0)
menu = Image.load("startmenu.png")

screenwidth = 480
screenheight = 272

while true do
screen:clear()
screen:blit( 0, 0, menu, false)
screen:print(170,70,"Start",white)
screen.waitVblankStart()
screen.flip()
end

the main thing is when i run it in lua player for windows all i see is a blank screen. Can you see any reason for this

when u bilt the menu, dont put "false". try this:

white = Color.new(255,255,255)
black = Color.new(0,0,0)
orange = Color.new(255,102,0)
menu = Image.load("startmenu.png")

screenwidth = 480
screenheight = 272

while true do
screen:clear()
screen:blit( 0, 0, menu)
screen:print(170,70,"Start",white)
screen.waitVblankStart()
screen.flip()
end

[mark.sparky]

no it didnt work it is still blank and the cmd now says:
Luaplayer's Mikmod has a critical error:
_mm_critical 1
_mm_ errno 15
None of the supported the sound-devices were detected

[Grimfate126]

no it didnt work it is still blank and the cmd now says:
Luaplayer's Mikmod has a critical error:
_mm_critical 1
_mm_ errno 15
None of the supported the sound-devices were detected

post your menu pic. what fromat is it?

[mark.sparky]

here is my menu (please dont use it anyone). . it is png

[Grimfate126]

here is my menu (please dont use it anyone). . it is png

hmm, try it on your psp. it doesnt work for me either.

[mark.sparky]

k did you mean it doesnt work on luaplayer windows

[Grimfate126]

k did you mean it doesnt work on luaplayer windows

i guess. does it work on ur psp tho?

[mark.sparky]

nope it doesnt work on my psp but my psp is fw 2.6 (coz no-one i know has fw1.5 )

[mark.sparky]

hey is there anything wrong with this code because when i run it it just freezes but everything shows.
code:

white = Color.new(255,255,255)
red = Color.new(255,0,0)
menu  = Image.load("images/menu.png")
menuselect = 0

while true do
screen:clear()

pad = Controls.read()

screen:blit(0,0,menu)

if pad:up() then
menuselect = menuselect - 1
end
if pad:down() then
menuselect = menuselect + 1
end
if menuselect == -1 then
menuselect = 1
end
if menuselect == 2 then
menuslect = 0
end

if menuslect == 0 then
screen:print(240,120,"Start",red)
screen:print(240,150,"Quit",white)
end
if menuselect == 1 then
screen:print(240,120,"Start",white)
screen:print(240,150,"Quit",red)
end

screen.waitVblankStart()
screen.flip()
end

[Bronx]

I don't thikn anything is wrong, it seems like the psp ran out of memory if it froze, but that wouldn't make sense.

[mark.sparky]

no i used it on lua player windows and when i ran it it just wouldnt move and let me change the color of the text (i.e. the selector)

[Altair]

Try this:

white = Color.new(255,255,255)
red = Color.new(255,0,0)
menu  = Image.load("images/menu.png")
menuselect = 0

while true do
screen:clear()

pad = Controls.read()

screen:blit(0,0,menu)

if pad:up() then
menuselect = menuselect - 1
end
if pad:down() then
menuselect = menuselect + 1
end
if menuselect < 0 then
menuselect = 1
end
if menuselect > 1 then
menuselect = 0        --you forgot an "e" here
end

if menuselect == 0 then        -- here aswell
screen:print(240,120,"Start",red)
screen:print(240,150,"Quit",white)
end
if menuselect == 1 then
screen:print(240,120,"Start",white)
screen:print(240,150,"Quit",red)
end

screen.waitVblankStart()
screen.flip()
end

[mark.sparky]

thnx its works (mostly) lol

[cwirsing]

http://www.sendspace.com/file/4jg6xl
Can someone take a look at my code. There is a problem with putting the animation on the screen.

[mark.sparky]

Hey does anyone know how to do animation. Like when you are using a sprite sheet

[Bob Hoil]

someone told me to use this code to make a player controlled player pop up but not sure if i can get it too work

player{}
player.x
player = image.load("player.png")
controls.red()

If pad:right then
player.x = player.x + 5
end

if pad:left then
player.x = player.x -5
end

[Access_Denied]

That isn't the entire code, he's just showing you an example. A complete code would be:

blue = Color.new(0,0,255)
player = Image.createEmpty(20,20) --creates a block 20 pixels by 20 pixels
player:clear(blue) -- colors the block blue
Player = {}
Player = {x = 460, y = 252} -- x and y coordinates of block
while true do
pad = Controls.read()
screen:clear()
screen:blit(Player.x,Player.y,player) --blits block to the screen
if pad:left() then
Player.x = Player.x - 2
end
if pad:right() then
Player.x = Player.x + 2
end
screen.waitVblankStart()
screen.flip()
end

You can copy and paste this code it works. But you have to take out the spaces it puts in at line 9.

[Bob Hoil]

Ok thanks a lot this wil really helpo me out a lot!

Double Post Merge

what about up and down/

Double Post Merge

i want a specified picture as the blue block also

[Access_Denied]

Ok thanks a lot this wil really helpo me out a lot!

Double Post Merge

what about up and down/

Double Post Merge

i want a specified picture as the blue block also

Ffor up and down add this under right and left:

if pad:up() then
Player.y = Player.y - 2 
end
if pad:down() then
Player.y = Player.y + 2
end

For a picture, just delete these line:

player = Image.createEmpty(20,20) --creates a block 20 pixels by 20 pixels
player:clear(blue) -- colors the block blue

and add this line

player = Image.load("YourImage.PNG")

[Bob Hoil]

now i need too now how to set boundries and add enemy's the tutorials don't explain very well

[Access_Denied]

To ad boundries just put these lines in:

if Player.x > 460 then -- this number will change if your character size is larger                  
Player.x = 460           --or smaller than 20
end
if Player.x < 0 then
Player.x = 0
end
if Player.y > 252 then -- again this number will change
Player.y = 252
end
if Player.y < 0 then
Player.y = 0
end

To add enemies you need to know some Artificial Intelligence, which I don't think you're that far yet. But if you want to know PM me and I can try to help you.
BTW- Use Evilmana.com for tutorials, they're really easy.

[Bronx]

adding enemy (that can control them selves a.k.a AI) is very difficult.

[Access_Denied]

Depending on how intelligent the enimies are, it can be simple. Like I said you can PM me for help, or just post here and we'll try to help as much as possible.

[Bronx]

yeah could be as simple as this.

if player.x < enemy.x then
enemy.x = enemy.x -5
end

if player.x > enemy.x then
enemy.x = enemy.x +5
end

that way the enemy just follows the character

[Access_Denied]

That's how most games do it. Then soon as the enemy touches the character the health drops by 5. But it could be VERY complicated.