Lua Programming Help Thread

[ZeroMega]

Btw I had a question that never got answered. Can someone tell me what I'm doing wrong? I'm an idiot when it comes to raw scripting. :ROFL:

Lua Programming Help Thread
^ It's here ^

[PSPhakkor]

Btw I had a question that never got answered. Can someone tell me what I'm doing wrong? I'm an idiot when it comes to raw scripting. :ROFL:

Lua Programming Help Thread
^ It's here ^

You could do it right before you blit flower to the screen, or anywhere in the while true loop. Just make the x coordinate for "flower" a variable, and increase or decrease it depending on how you want to move it. You can do the same for the y coordinate

[BlackShark]

does any body have a bullet or "projectile" system that i can use thats simpler than the evilmana one? Because i can't seem to get that one to work with collision, its giving me a headache Thanks for your help

[SG57]

Hey - Does anyone know how to clear an image of all drawings, but keep the image? Ive tried re-loading it via:

clean_guy = Image.load("guy.png")

guy = clean_guy

...

-- draw some stuff on guy.. like a line or if i clear it
guy:clear()

-- now i want to get it back to clean image... ive tried:
guy = clean_guy

-- but it doesnt work...

[eyece]

Hey - Does anyone know how to clear an image of all drawings, but keep the image?

... eh?

guy = Image.createEmpty(clean_guy:width(), clean_guy:height())

???

[SG57]

BlackShark - Make your own. I did for my Call of Duty 2 game - it's not as hard as you think... Just sit down and thik rationally about what you want to do, and think of methods to make it work... If all else fails, take someone elses projectile system, but i hope you realize most bullet systems are game specific... If you arent making a side scrolling shooter, then dont use a side scrollers bullet system. IF you arent making a game with a fake Z buffer, dont use a bullet system from such a game...

[BlackShark]

Ill give it a try, thanks (its a 2d space shooter, shouldn't be too hard)

[EminentJonFrost]

Hey - Does anyone know how to clear an image of all drawings, but keep the image? Ive tried re-loading it via:

clean_guy = Image.load("guy.png")

guy = clean_guy

...

-- draw some stuff on guy.. like a line or if i clear it
guy:clear()

-- now i want to get it back to clean image... ive tried:
guy = clean_guy

-- but it doesnt work...

how about loading the same image under two variables? one to mess around with and another to switch back to normal with.

clean_guy = Image.load("guy.png")
other_guy = Image.load("guy.png")

i know its not the most creative way to do it, but it is A way. (i have no doubt you'll come up with something inventive soon though )

[Deanaw22]

Hi guys, just wondering if anyone could point me in the right direction to learn wifi/netlib for the psp, i already know LUA and im in the process of planning an online community chat game/world for the psp but im having trouble with the wifi side of things

Help is really appreciated

-- Thanx, Dean

[HeaD_ShOt]

Ill give it a try, thanks (its a 2d space shooter, shouldn't be too hard)

thats what im working on...

[EminentJonFrost]

Hi guys, just wondering if anyone could point me in the right direction to learn wifi/netlib for the psp, i already know LUA and im in the process of planning an online community chat game/world for the psp but im having trouble with the wifi side of things

Help is really appreciated

-- Thanx, Dean

http://wiki.ps2dev.org/psp:lua_player

go to special functions of luaplayer, and at the bottom theres wifi functions. i dont know any netlib, sorry.

[PSPhakkor]

how about loading the same image under two variables? one to mess around with and another to switch back to normal with.

clean_guy = Image.load("guy.png")
other_guy = Image.load("guy.png")

i know its not the most creative way to do it, but it is A way. (i have no doubt you'll come up with something inventive soon though )

another way is to store the image labels in a table so that they can be accessed with a variable. what I mean is

guy[1]=Image.load(img)
guy[2]=Image.load(same img)

then you can change a variable "x" between 1 and 2 and then blit the image with "screen:blit(0, 0, guy[x])

[GuitarGod1134]

Ok guys need some help, Im making a lil game here to test my collision skills and i get this error

error: script.lua:18: loop in gettable

I think it might be because I have a lot of random calculating going on help plz

Spoiler for Fish Dish:

--Fish Dish
--by GuitarGod1134     
--colors
red = Color.new(255,0,0)
black = Color.new(0,0,0)
--load the images
fish1 = Image.load("pics/fish1.png")
fish2 = Image.load("pics/fish2.png")
playerf = Image.load("pics/playerf.png")
shark = Image.load("pics/shark.png")
--variables for coordinates
playerc = {}
playerc = {x = 26, y = 145}
fish1c =  {x = math.random(480,500), y = math.random(0,272), height = fish1:height(), width = fish1:width()}
fish2c =  {x = math.random(480,500), y = math.random(0,272), height = fish1:height(), width = fish1:width()}
sharkc =  {x = math.random(480,500), y = math.random(0,272), height = shark:height(), width = shark:width()}
fish3c =  {x = math.random(480,500), y = math.random(0,272), height = fish2:height(), width = fish2:width()}
fish4c =  {x = math.random(480,500), y = math.random(0,272), height = fish2:height(), width = fish2:widht()}
--var for moving fish
movf = 0
--lives and score
plives = 5
pscore = 0
--players widht and height for collision
playerWidth = 41
playerHeight = 41
--collision function delcaration
function collisionCheck(object)
if (playerc.x + playerWidth > object.x) and
(playerc.x < object.x + object.width) and
(playerc.y + playerHeight > object.y) and
(playerc.y < object.y + object.height) then
pscore = pscore + 1
end
end
-----------------
-----------------
--END FUNCTION---
-----------------
function collisionCheckfs()
if (playerc.x + playerWidth > sharkc.x) and
(playerc.x < sharkc.x + sharkc.width) and
(playerc.y + playerHeight > sharkc.y) and
(playerc.y < sharkc.y + sharkc.height) then
plives = plives - 1
end
end
-----------------
-----------------
--END FUNCTION---
-----------------
while true do
screen:clear()
                 --blit the fish
                 screen:blit(playerc.x,playerc.y,playerf)
                 screen:blit(fish1c.x,fish1c.y,fish1)
                 screen:blit(fish2c.x,fish2c.y,fish1)
                 screen:blit(fish3c.x,fish3c.y,fish2)
                 screen:blit(fish4c.x,fish4c.y,fish2)
                 screen:blit(sharkc.x,sharkc.y,shark)

      --call functions for collision
       collisionCheck(fish1c)
       collisionCheck(fish2c)
       collisionCheck(fish3c)
       collisionCheck(fish4c)
       collisionCheckfs()
--controls
pad = Controls.read()
    if pad:up() then
       playerc.y = playerc.y - 1
                 end
    if pad:down() then
       playerc.y = playerc.y + 1
                 end
                 --move the fish
       if movf == 0 then
       --sub the x coordinate
          fish1c.x = fish1c.x - 4
          fish2c.x = fish2c.x - 4
          fish3c.x = fish3c.x - 4
          fish4c.x = fish4c.x - 4
          sharkc.x = sharkc.x - 7
       end
--now set them back
      if fish1c.x <= 0 then
         fish1c.x = math.random(480,500)
                  end
      if fish2c.x <= 0 then
         fish2c.x = math.random(480,500)
                  end
      if fish3c.x <= 0 then
         fish3c.x = math.random(480,500)
                  end
      if fish4c.x <= 0 then
         fish4c.x = math.random(480,500)
                  end
      if sharkc.x <= 0 then
         sharkc.x = math.random(480,500)
         end

         --print the lives and so on
screen:print(0,0,"Player lives ="..plives,red)
screen:print(0,10,"Player score ="..pscore,black)

--END it
screen.waitVblankStart()
screen.flip()
end

[Deanaw22]

http://wiki.ps2dev.org/psp:lua_player

go to special functions of luaplayer, and at the bottom theres wifi functions. i dont know any netlib, sorry.

Thanx alot pal! :)

[myschoo]

pls can anyone tell whats the function to copy file from one location to other location???

like from ms0:/folder1 to ms0:/folder2

[andyauff]

Can anyone tell me how to make a block of text that can be scrolled down to show more? I hope that makes sense....

[eyece]

fish4c = {x = math.random(480,500), y = math.random(0,272), height = fish2:height(), width = fish2:widht()}

Can anyone tell me how to make a block of text that can be scrolled down to show more? I hope that makes sense....

blit your text to a an image and have that image blit cliped, then just move the x of the clip up and down to "scroll".

[GuitarGod1134]

Lol wow simple spelling error lol thanks.

[andyauff]

Yeah, that's the one way I had thought of, thanks. I guess I'll go ahead and do that.
-= Double Post =-
Oh and how would I clip the image?

[GuitarGod1134]

ok one more thing how do i use transparency when blitting. its something like
screen:blit(0,0,bla,true) or something right?

[eyece]

clip and image:

nil image:blit(x, y, Image source, [sourcex, sourcey, width, height], [alpha = true])

ok one more thing how do i use transparency when blitting. its something like
screen:blit(0,0,bla,true) or something right?

look at the above quote from the ps2dev wiki, [alpha = true].

pls can anyone tell whats the function to copy file from one location to other location???

System.rename("ms0:/folder0/file.file", ms0:/folder1/file.file")
.... may work, but i don't think it will.

[andyauff]

That will clip it, but how will I be able to show the rest if it's clipped off? Thanks for all the help, by the way.

[GuitarGod1134]

I already looked at wiki and it didnt really explain how to use it. doesn anyone know an example?

[EminentJonFrost]

That will clip it, but how will I be able to show the rest if it's clipped off? Thanks for all the help, by the way.

image:blit(x, y, imagesource)

to blit the whole image same function, less input.

and the function eyece put doesnt 'clip' it off, rather copies a portion of an image.

[myschoo]

its strange but somehow it works in PC but not very well in PSP, but sill, that renaming, i needd copy from --> to

[EminentJonFrost]

I already looked at wiki and it didnt really explain how to use it. doesn anyone know an example?

transparency when blitting...i dont know how to do that. but whats wrong with giving the image a transparency yourself so you wont have to worry about it?

[GuitarGod1134]

I know how to blit images. I need to know how to blit them with transparent backgrounds

[EminentJonFrost]

its strange but somehow it works in PC but not very well in PSP, but sill, that renaming, i needd copy from --> to

what do you mean by 'but not very well in PSP'?

[andyauff]

Okay, I'll try it, thanks.

[EminentJonFrost]

I know how to blit images. I need to know how to blit them with transparent backgrounds

use an image editing program. i use The GIMP. :)
its like Photoshop for the poor!