Lua Programming Help Thread

[GuitarGod1134]

okay grimfate after that huge long collision detection are u saying i do

--long collisin thing here then
hit = "true"
end

if hit = "true" then
--now would i do what slice4ever said and just blit the demon somewhere really far off the screen like 800, 900 or something? if so i have it so that the demon is chasing something wouldnt it eventually work its way back on to the screen? isnt there someway i can unload it or something or once its blit off the screen can i stop it from following if u need it i can post my source.

[TacticalPenguin]

how about do
if dead == false then screen:blit(demon.x,demon .y,demon.img) end
Then make dead become true when collision happens:
if hit == true then dead == true end

Thatll make it stop blitting when it gets hit.

[yaustar]

Have the demon keep track of its own health in the table. Check the health before updating, if it is lower then 0, then don't update the AI.

[myschoo]

bgmenu = Image.load("bg_menu.png")
shot = Sound.load("bullet.wav",false)
while true do
  screen:blit(0,0,bgmenu)
  screen.waitVblankStart()
  screen.flip()
  pad = Controls.read()
  if pad:cross() then
  shot:play()
  screen.waitVblankStart(100)
  dofile("game.lua")
  break
 end
end

everytime i press X its just crappy sound and not my full wav. i can hear maybe 0.001 sec from it...whats the prob?

[TacticalPenguin]

bgmenu = Image.load("bg_menu.png")
shot = Sound.load("bullet.wav",false)
while true do
  screen:blit(0,0,bgmenu)
  screen.waitVblankStart()
  screen.flip()
  pad = Controls.read()
  if pad:cross() and play == false then
  play = true
  end
  if pad:cross() and play then
  play = false
  end
  if play then
  shot:play()
  end
  screen.waitVblankStart(100)
  dofile("game.lua")
  break
 end
end

Thatll make X toggle it on and off.

[myschoo]

well i found that problem is that my sound is 20kbps ... 64kbps plays ok

edit. yeh problem solved, it must be *.wav file with bitrate 64kbps

[MSeven]

whats the code for 'if no arrow keys are press then'
-= Double Post =-
i mean, "if the last keypressed was (lastkeypressed) then"

[TacticalPenguin]

if pad == nil then blah end

I THINK thats it, try it.

[MSeven]

no i figured it out, its if not pad:right() and not pad:left() then

[TacticalPenguin]

But to indicate absolutely NO buttons are being pressed, its if pad == nil

[myschoo]

i want to do, when i touch the object and press X,it will disappear...
i thought about something like this:

function touchFunction()
pad = Controls.read()
if object1.y = object2.y and object1.x = object2.x and pad:cross() then
object2 == nil
end

then just

while true do

functionTouch()

this doesnt work, could anyone help?

[TacticalPenguin]

function touchFunction()
pad = Controls.read()
touch = 1
if object1.y = object2.y and object1.x = object2.x and pad:cross() then
touch = 2
end

while true do

functionTouch
if touch == 1 then screen:blit(object2.x,object2.y,object2.img) end

[MSeven]

But to indicate absolutely NO buttons are being pressed, its if pad == nil

actually my way worked...

[myschoo]

error: "then" expected near "=" :/

[TacticalPenguin]

function touchFunction()
pad = Controls.read()
touch = 1
if object1.y == object2.y and object1.x == object2.x and pad:cross() then
touch = 2
end

while true do

functionTouch
if touch == 1 then screen:blit(object2.x,object2.y,object2.img) end

You forgot to use double == signs. When you compare two things, its ==. When you make something equal to something else, its =. And yes yoyomacy your way works fine, but you originally asked how to tell if no buttons were being pressed.

[myschoo]

error: calling "blit" on bad self <number expected got nil>

[GuitarGod1134]

Have the demon keep track of its own health in the table. Check the health before updating, if it is lower then 0, then don't update the AI.

i was considering tactial's idea but then i saw ur post. yes i have the demon's health set to a variable. and my musket does 5-10 damage so i set it to math.random(5,10)

so i would have to combine tacticals post along with yours ok i see i got it now. thanks guys

[CtrlAltDeleteDie]

I need to blit the same picture in different spots simultaneously. I have the x/y positions set up in a table. I really am stumped...

Here is an example of what I have.

--Dot positions
pos = {}
pos[1] = {x=s1,y=f1}
pos[2] = {x=s2,y=f1}

--Chords
maj = {}
maj[1] = {name = "C Major", pos = {5,9,14}}

I need it to blit a picture at pos 5,9, and 14. Can you help me?

ps. s1/f2 indicate coordinates.

[Grimfate126]

Heres a simulator i am doing, When i run it, It has 2 white pixels on the left side of the screen, But they arent moving, They just stay still, I tried to run this in both the PSP and the PC and still, Theirs 2 white pixels on the left side, Anyone know why?

size = 200
zMax = 5
speed = 0.050

width = 480
height = 272

background = Image.load("background.png")

starfield = {}
math.randomseed(os.time())

function createStar(i)
  starfield[i] = {}
  starfield[i].x = math.random(2*width) - width
  starfield[i].y = math.random(2*height) - height
  starfield[i].z = zMax
end

for i = 1, size do
  createStar(i)
  starfield[i].z = math.random(zMax)
end

white = Color.new(255, 255, 255)
black = Color.new(0, 0, 0)

while true do
  screen:clear(black)
  screen:blit(0, 0, background)
  for i = 1, size do
    starfield[i].z = starfield[i].z - speed
    if starfield[i].z < speed then createStar(i) end
    x = width / 2 + starfield[i].x / starfield[i].z
    y = height / 2 + starfield[i].y / starfield[i].z
    if x < 0 or y < 0 or x >= width or y >= height then
      createStar(i)
    else
      screen:pixel(x, y, white)
    end
  end
  screen.waitVblankStart()
  screen.flip()
  if Controls.read():start() then 
break 
end
end

wow. you ripped that entire code from shines example. and didnt even give credit. (in your "demo" that you released as well). and, you claealt state that its made by you.and you cant even get it to work. sad... if anyone doesnt believe me, download luaplayer, go to the applications folder, and look at the "Starfield" folder. its the exact same thing. he just added in a speed var. and its unefficient too. 3 different files. lol.


you sicken me.

[CtrlAltDeleteDie]

^^ I thought the same thing, but didn't bother to check it out. tisktisktisk

[slicer4ever]

it is i never bothered to delete the example off i thought so to

[Anti-QuickJay]

Is ther a working return to XMB function, But for 2.71 SE-C?
Or if thier is a working one, What firmwares does it work on?
All i know of is

if pad:start() then
os.exit()
end

But it doesnt work...

[slicer4ever]

unless you compile the luaplayer it well bring you back to the luaplayer menu but it is break

[Anti-QuickJay]

So i should just use this:

if pad:start() then
break
end

[Access_Denied]

So i should just use this:

if pad:start() then
break
end

Sigh. break does NOT exit back to the XMB. It transfers from one loop to another. The only ways to go the XMB are the HOME button, os.exit() and System.Quit().

[Anti-QuickJay]

Ok, I havent used System.Quit()
I better try it, Thanks!

[Access_Denied]

Ok, I havent used System.Quit()
I better try it, Thanks!

It only works with the Lua Player mod by Cools.

[Anti-QuickJay]

Thats the one im using.

[slicer4ever]

o well then now i know

[GuitarGod1134]

It only works with the Lua Player mod by Cools.

Was the function System.Quit() added in the Lua Player mod? Meaning if i put it on a regular Lua player would it say it is an error?