Lua Programming Help Thread

[Grimfate126]

ok im using the 5 bullet code from evil mana and i have it set up so that when the bullet enter a certain are (hits the target) the score goes up by one
i have it working but the score continues to go up repeatedly unless i fire 5 bullets out of the zone. here is my code


if Wario[1].y + 72 > BulletInfo[i].y and BulletInfo[i].x + 8 > Wario[1].x and BulletInfo[i].x < Wario[1].x + 107 then
BulletInfo[i].firing = false
score = score + 1
end

please tell me what to do to make the score go up by JUST one not one repeated

the problem is, even after uve declared bullet firing to false, the x and y valuse retain their valuse. you need a bool:

hit = false

if Wario[1].y + 72 > BulletInfo[i].y and BulletInfo[i].x + 8 > Wario[1].x and BulletInfo[i].x < Wario[1].x + 107 then
BulletInfo[i].firing = false
hit = true
end 

if hit == true then
score = score + 1
hit = false
end

try that

[Bronx]

Why does everyone use Charlie's method? Sure its greats for begginers, but not when you go on to greater tasks. I mean his tutorials are for getting people started in lua, and provide a foundation. NOT provide a way you will use your whole career of lua

[jamz1825]

ive already tried that the score just continues to rise

EDIT: i double checked and tried urs, still no luck
-= Double Post =-
and bronx... about the getting started part...this is my first lua

[Grimfate126]

Why does everyone use Charlie's method? Sure its greats for begginers, but not when you go on to greater tasks. I mean his tutorials are for getting people started in lua, and provide a foundation. NOT provide a way you will use your whole career of lua

whos charlie???

[jamz1825]

no worries i just got it, i had to move the coordinates of the bullet after it hit to a random spot that wouldnt make a difference

[Bronx]

Oh, sorry dude... Continue on learning then

Charlie is the owner of Evilmana >.> (AKA PSPMillionare)

[Grimfate126]

Oh, sorry dude... Continue on learning then

Charlie is the owner of Evilmana >.> (AKA PSPMillionare)

o his bullet code.. i see now.

[Mraellis]

thx aphonia, but the index.lua in snake goes on about strings and stuff i dont get in that bit >.<

i can wait till more program lua tuts come out as it might help me.

[LMelior]

no worries i just got it, i had to move the coordinates of the bullet after it hit to a random spot that wouldnt make a difference

That's an ugly fix... All you had to do was add an extra part to your if statement:

if (collision stuff) and BulletInfo[i].firing then
    BulletInfo[i].firing = false
    score = score + 1
end

Since the if statement will only trigger when firing == true and you immediately set it to false if it does trigger, than it will only run once.

[Grimfate126]

That's an ugly fix... All you had to do was add an extra part to your if statement:

if (collision stuff) and BulletInfo[i].firing then
    BulletInfo[i].firing = false
    score = score + 1
end

Since the if statement will only trigger when firing == true and you immediately set it to false if it does trigger, than it will only run once.

we all got pwnt.

[LMelior]

can someone plz say how i can get lua to read a random line from a txt file and print it to screen?

or show me how my code on the last page is wrong.

Check out the io.lines entry in the Lua Reference Manual. I've never had to do what you want before, but if I did then I would probably use that. I don't know if this will work or not, but I'd try this:

tableoflines={}
k=0
for line in io.lines("filename.txt") do
   k=k+1
   tableoflines[k]=line
end

randomline=tableoflines[math.random(k)]

No guarantees, of course. :)

[jamz1825]

ok, there could be a very simple answer to this but of coarse i dont know...i am jsut begining

andway
can you tell me how to make it so when i press start the game pauses and if i press it agin it resumes.

i know something exists like

system.sleep()

anyway could anyone help me out?

anyone?

i got it so i can pause but i haveto resume with another button
how could i do it with the smae button (start)

[JoeDaStudd]

did you use this for the pause code?

--This goes somewhere near the start--
function pause()
while true do
pad:Controls.read() 
screen:clear()
screen:print(200,200,"Game Paused",red)
if pad:start() and oldpad:start()~=pad:start() then
break
end
screen.waitVblankStart()
screen.flip()
end
end
--This goes in the main loop--
if pad:start() and oldpad:start()~=pad:start() then
pause()
end

[Mraellis]

thanks lmelior but that doesnt work
and that lua link is confusing.
i think i'll wait till a few more lua tuts for program luas out before i make something.

[%chrono trigger%]

ok heres my problem i got my code pretty much sorted out but when i olay it the loading screen stays on 0% and then turns off my psp whats wrong anybody know?

[Grimfate126]

ok heres my problem i got my code pretty much sorted out but when i olay it the loading screen stays on 0% and then turns off my psp whats wrong anybody know?

can we see your code?

its probably a loading problem.

[%chrono trigger%]

nope didnt find it here is my code:
pink = Color.new(255, 0 , 153)
GameStatus = "Loading"
LoadingTimer = Timer.new()

LoadingTimer:start()

if GameStatus == "Loading" and LoadingTimer:time() >= 1 and LoadingTimer:time() < 50 then
screen:clear()
screenrint(194, 136, "Loading: 0%", pink)
screen.flip()
gunscreen = Image.load("gunscreen.jpg ")
end
if GameStatus == "Loading" and LoadingTimer:time() >= 50 and LoadingTimer:time() > 100 then
screen:clear()
screenrint(194, 136, "Loading: 20%", pink)
screen.flip()
gunman = Image.load("gunman.jpg")
end
if GameStatus == "Loading" and LoadingTimer:time() >= 100 and LoadingTimer:time() > 150 then
screen:clear()
screenrint(194, 136, "Loading: 40%", pink)
screen.flip()
background = Image.load("background.jp g")
end
if GameStatus == "Loading" and LoadingTimer:time() >= 150 and LoadingTimer:time() > 200 then
screen:clear()
screenrint(194, 136, "Loading: 60%", pink)
screen.flip()
playera = Image.load("playera.png")
end
if GameStatus == "Loading" and LoadingTimer:time() >= 200 and LoadingTimer:time() > 250 then
screen:clear()
screenrint(194, 136, "Loading: 80%", pink)
screen.flip()
playerb = Image.load("playerb.png")
end
if GameStatus == "Loading" and LoadingTimer:time() >= 250 and LoadingTimer:time() > 300 then
screen:clear()
screenrint(194, 136, "Loading: 90%", pink)
screen.flip()
end
if GameStatus == "Loading" and LoadingTimer:time() >= 300 and LoadingTimer:time() > 350 then
screen:clear()
screenrint(194, 136, "Loading: 100%", pink)
screen.flip()
end
if GameStatus == "Loading" and LoadingTimer:time() > 351 then
LoadingTimer:stop()
LoadingTimer:reset()
GameStatus = "Menu"
end
screen:blit(0,0,gunman)
screen.waitVblankStart(60 )
screen:clear()
screen.waitVblankStart(60 )
screen:clear()
screen:blit(0,0,backgroun d)
playera = {}
player[a] = {x = 200, y = 50}
playerb = {}
player[b] = { x = 400, y = 100 }
screenwidth = 480 - player.width()
screenheight = 272 - player.width()
player[b] = { x = 400, y = 100 }
screen:blit(Player [a].x,Player [a].y,playera)
screen:blit(Player[b].x,Player.y,playerb)
screenwidth = 480 - player.width()
screenheight = 272 - player.width()
Playerb = { x = 400, y = 100 }
if pad:left() and Player[1].x > 0 then
Player[1].x = Player[1].x - 2
end
if pad:right() and Player[1].x < screenwidth then
Player[1].x = Player[1].x + 2
end
if pad:up() and Player[1].y > 0 then
Player[1].y = Player[1].y - 2
end
if pad:down() and Player[1].y < screenheight then
Player[1].y = Player[1].y + 2
end
screen.waitVblankStart()
screen.flip()

[Nutterbutter]

Why does everyone use Charlie's method? Sure its greats for begginers, but not when you go on to greater tasks. I mean his tutorials are for getting people started in lua, and provide a foundation. NOT provide a way you will use your whole career of lua

But why use Lua for "your whole career" when you have C++?


@ Chrono, i think that would load the image into memory over and over again realy quickly, crashing the PSP.

Use

if loading step = 1 

IF background (or whatever image) = null

//* Print text saying 20% done or whatever

//* Load Background image...

END

else

load = 2

END

END

That was terrible i dont even know if there is a ELSE function in Lua.

Wait, i dont know Lua at all! But anyway what you want done can be acomplished with Null.

So

IF Background = null

is

If the memory at the address background is empty then.

or

if background is empty then.

[%chrono trigger%]

where do i put the IF Background = null?
and what does the code do? (so im not just coping and pasting)

[Nutterbutter]

I explained it at the bottom. DONT copy that code, i dont know lua, it wont work. It was just theory code.

IF background = null will check to see if there is no image in background.

Soo take out the timer and put that there instead. The timer is what is crashing the PSP.

Ergh ive explained this terribly...

[%chrono trigger%]

yeah but im sort of getting the idea

[Nutterbutter]

Good, null is a useful part of programming.

[yaustar]

Use nil instead of NULL for Lua.

[goldensupersonic]

Hey can someone help me out with making this rpg work. I'm trying to make my sprites do a proper walk so if they press down it looks like it's going down like it is a real rpg.

grass = Image.load("grass.png") 
player = Image.load("player.png")
player1 = Image.load("player1.png") 
player2 = Image.load("player2.png") 
player3 = Image.load("player3.png") 
player4 = Image.load("player4.png") 
player5 = Image.load("player5.png")
player6 = Image.load("player6.png")

screenwidth = 480 - player:width() 
screenheight = 272 - player:width() 

Player = { } 
Player[1] = { x = 200, y = 50 } 

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

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

screen:blit(Player[1].x,Player[1].y,player) 

if Player[1].dir=="left" then 
screen:blit(Player[1].x,Player[1].y,player1) 
end 

if Player[1].dir=="right" then
screen:blit(Player[1].x,Player[1].y,player2) 
end 

if Player[1].dir=="up" then
screen:blit(Player[1].x,Player[1].y,player3) 
end 

if Player[1].dir=="down" then
screen:blit(Player[1].x,Player[1].y,player4) 
end 

if pad:left() and Player[1].x > 0 then 
Player[1].dir = "left" 
Player[1].x = Player[1].x - 4 
end 

if pad:right() and Player[1].x < screenwidth then 
Player[1].dir = "right" 
Player[1].x = Player[1].x + 4 
end 

if pad:up() and Player[1].y > 0 then 
Player[1].dir = "up" 
Player[1].y = Player[1].y - 4 
end 

if pad:down() and Player[1].y < screenheight then 
Player[1].dir = "down" 
Player[1].y = Player[1].y + 4 
end 

if pad:home() then break 
end 

screen.waitVblankStart() 
screen.flip() 
end

[mako]

hey can someone tell me:
A. what image files are supported with luaplayer
B. what image file can be over 480x272 while still being transparent
C. why a png can't be over 480x270

i need this for a boss in my game Orbz. the boss looks horrible because I used a jpeg for it cause the total strip image is 30XX by 163

also, coding help:
A. is there a function/code that will allow me to do something like:
move_towards(xvar_of_obje ct,yvar_of_object,x,y,spe ed)
or any form of a "move towards a point"? or even like move in a direction
move(xvar_of_object,yvar_ of_object,direction,speed ) ?

[Grimfate126]

hey can someone tell me:
A. what image files are supported with luaplayer
B. what image file can be over 480x272 while still being transparent
C. why a png can't be over 480x270

i need this for a boss in my game Orbz. the boss looks horrible because I used a jpeg for it cause the total strip image is 30XX by 163

also, coding help:
A. is there a function/code that will allow me to do something like:
move_towards(xvar_of_obje ct,yvar_of_object,x,y,spe ed)
or any form of a "move towards a point"? or even like move in a direction
move(xvar_of_object,yvar_ of_object,direction,speed ) ?

A. png and jpg, bmp if you use BMPlib be youresam.
B. none. if you have anything over 480x272, theres a 90% chance lua wont load it.
C.cause it takes wayyy too much ram. a 200x200 png image takes almost 1MB, and you only have like 10MB to work with.

CODING

A. youll have to do it yourself.

[mako]

A. png and jpg, bmp if you use BMPlib be youresam.
B. none. if you have anything over 480x272, theres a 90% chance lua wont load it.
C.cause it takes wayyy too much ram. a 200x200 png image takes almost 1MB, and you only have like 10MB to work with.

CODING

A. youll have to do it yourself.

B: I can load a 3000x163 jpg fine, just no transparency. and on the psp, it doesn't show up at all. just a big white block

so will splitting the images and loading them separately work? i reeli doubt it, but hey, its worth a shot. there would be about 40 163x163 pngs

[Grimfate126]

B: I can load a 3000x163 jpg fine, just no transparency. and on the psp, it doesn't show up at all. just a big white block

so will splitting the images and loading them separately work? i reeli doubt it, but hey, its worth a shot. there would be about 40 163x163 pngs

well, jpegs have a higher chance of loading, but they just become white blocks.

[mako]

so will splitting the images and loading them separately work? i reeli doubt it, but hey, its worth a shot. there would be about 40 163x163 pngs

[Grimfate126]

so will splitting the images and loading them separately work? i reeli doubt it, but hey, its worth a shot. there would be about 40 163x163 pngs

40?!?? i doubt it. but u might as well try. if that dont wrk. convert your code to C. it should work much better.