Lua Programming Help Thread

[thatoneguy559]

does anyone know how to use the System.irda() functions?
i'm trying to use it in my app but whenever i press on the function nothing happens. can someone help me?

[Nielkie]

ty again

Post count whoring much?

[yaustar]

Well I'm completely stumped by this. How do I make music loop in the latest Luaplayer HM. I tired all sorts of techniques but nothing is working.Let me give you situation.

Not 100% sure how Ogg.eos() actually works especially if the music hasn't been played yet but you get the gist of what I am trying to do here:

BG1 = Ogg.load("Music.ogg");

while true do	
	if Ogg.eos() == 1 then
		Ogg.play(BG1);
	end
end

[dan369]

As a little note, from what the docs said, you can't play multiple .ogg files at one time. I think your using it just as a backing track but just incase. Your better opinion would be .wav for sound effects e.g attacks, damage noise etc.
Also would it be possible to use .ogv? .OGV is the ogg video format, the files are very small & would be great for HM. I don't know what lib HM uses, i think its libvorbis? Has that got the support (i know this is C related more than Lua but it crosses over ;) )

[Predricted]

Is there amount of max images you can load cause i get error when I load more then ?? amount of images then it gives
Image.load:error loading image

[xXChromeXx]

I haven't coded in a while. How would I check collision based on color?

pixel:color = black ?

[Xteaph-N]

Is there amount of max images you can load cause i get error when I load more then ?? amount of images then it gives
Image.load:error loading image

Depending on the player your using you can have up to 10MB of space for images. Other then the memory limit I don't believe there are others.

Not 100% sure how Ogg.eos() actually works especially if the music hasn't been played yet but you get the gist of what I am trying to do here:

BG1 = Ogg.load("Music.ogg");

while true do	
	if Ogg.eos() == 1 then
		Ogg.play(BG1);
	end
end

Yes your calling out Ogg.eos() properly, and no I tried that method before; it didn't work.

[dan369]

Is there amount of max images you can load cause i get error when I load more then ?? amount of images then it gives
Image.load:error loading image

OR could be an invalid filepath.

[FaT3oYCG]

or the psp ran out of ram to store x ammount of images.

anyway onto my question anyone got a link to the latest release of pge luaplayer plz.

[dan369]

http://dl.qj.net/Phoenix-Game-Engine...3510/catid/204

[Predricted]

OR could be an invalid filepath.

Nope damn sure it isn't cause when i use the same file path but then with less lines with image.load then there is no error loading image.

[FaT3oYCG]

so you just skipped over my post then, why are you loading so many images, what for as there may be a solution to reduce the ammount of images that need to be loaded or displayed.

p.s. thanks dan

[Predricted]

so you just skipped over my post then, why are you loading so many images, what for as there may be a solution to reduce the ammount of images that need to be loaded or displayed.

p.s. thanks dan

All those images got a size of 480*272 and they are a part of a map that I made with a program where you can make a map and then it saves automaticly your map in a few images with the width and height you want.. all those images together are 1 big map

[Nielkie]

You don't have to load them all at the same time.

[Predricted]

You don't have to load them all at the same time.

What do you mean?
I load all images at begin of script

[Xteaph-N]

Nope damn sure it isn't cause when i use the same file path but then with less lines with image.load then there is no error loading image.

Nah, i think dan hit the nail on the head. Check that it's path is being declared in quotation marks et cetra.

Example Model:

Something = Image.load("Image/Some_Image.png")

[Nielkie]

I load all images at begin of script

Don't.

[Predricted]

Nah, i think dan hit the nail on the head. Check that it's path is being declared in quotation marks et cetra.

Example Model:

Something = Image.load("Image/Some_Image.png")

I even double checked dude,
I did this:
Removed the Image.load("Image/Some_Image.png") With error
and added a Image.load("Image/Some_Image.png") which had no error on the same line and i had still a image load blabla error
-=Double Post Merge =-

Don't.

Well how then?? Like loading them in a while loop?
I tried and still the error at one line

[Nielkie]

Well how then?? Like loading them in a while loop?

Dynamically load and unload them as needed.

[Xteaph-N]

Dynamically load and unload them as needed.

That causes slow down.

[Nielkie]

That causes slow down.

What, so he shouldn't make the game at all?

He shouldn't be composing his map as 480x272 images, but dynamically loading resources /is/ how one overcomes memory constraints...

[FaT3oYCG]

That causes slow down.

In which way do you mean it causes slow down, if you unload an image and load another in its place im pretty sure that the psp would not have a noticable swap time if any at all

What, so he shouldn't make the game at all?

He shouldn't be composing his map as 480x272 images, but dynamically loading resources /is/ how one overcomes memory constraints...

true true, why do people even argue with others that they know are better at coding than them and usually have more experience, atleast it seems like Xteaph-N doesnt know that much about this subject but is arguing just for the sake of it o_O.

p.s. it is because he is loading too many images and the psp runs out of ram, i have experienced the same problem a long time ago when i began coding in lua so you might aswel stop arguing now but thats up to you.

[qwikrazor87]

Yes your calling out Ogg.eos() properly, and no I tried that method before; it didn't work.

Okay, the way your calling it to check if it's the end of the song is wrong. i figured it out myself on why that doesn't work.
the way that you call it is like,

if Ogg.eos() then
Ogg.play(your song)
end

it is not
if Ogg.eos() == 1 then

that will not work
-=Double Post Merge =-

Well I'm completely stumped by this. How do I make music loop in the latest Luaplayer HM. I tired all sorts of techniques but nothing is working.Let me give you situation.

I load an Ogg then I play it in my main loop. Then I try to stop the music near the end and re-play the music. This is pretty much the gist of how I'm trying to do it:

BG1 = Ogg.load("Music.ogg")

music = true

while true do
pad = Controls.read()

if music == true then
Ogg.play(BG1)
end
if music == false then
Ogg.stop(BG1)
end

if pad:circle() then
music = true
end

if pad:cross() then
music = false
end
end

the reason why your music can't be played again after you stop it is because you have to reload the file to be played again. and if you want the ogg file to loop try this

for example:

BG1 = Ogg.load("Music.ogg")
music="true"

while true do
pad=Controls.read()

if pad:circle() or Ogg.eos() then
   music="true"
end

if pad:cross() then
   music="false"
end

if music=="true" then
   Ogg.stop()
   BG1 = Ogg.load("Music.ogg")
   music="play"
end

if music=="play" then
   Ogg.play()
end

if music=="false" then
   Ogg.stop()
end

end

I've tested that out myself and when you press Circle or when the song ends it restarts the song, and when you press Cross it stops the song

[yaustar]

Okay, the way your calling it to check if it's the end of the song is wrong. i figured it out myself on why that doesn't work.
the way that you call it is like,

if Ogg.eos() then
Ogg.play(your song)
end

it is not
if Ogg.eos() == 1 then

that will not work

Directly from the readme:

Ogg.eos() Returns 1 for EndOfSong and 0 for still playing.

If the readme is wrong then someone needs to update it.
-=Double Post Merge =-

the reason why your music can't be played again after you stop it is because you have to reload the file to be played again. and if you want the ogg file to loop try this

for example:

BG1 = Ogg.load("Music.ogg")
music="true"

while true do
pad=Controls.read()

if pad:circle() or Ogg.eos() then
   music="true"
end

if pad:cross() then
   music="false"
end

if music=="true" then
   Ogg.stop()
   BG1 = Ogg.load("Music.ogg")
   music="play"
end

if music=="play" then
   Ogg.play()
end

if music=="false" then
   Ogg.stop()
end

end

I've tested that out myself and when you press Circle or when the song ends it restarts the song, and when you press Cross it stops the song

The code doesn't continuously loop the music which is what the OP asked for:

Well I'm completely stumped by this. How do I make music loop in the latest Luaplayer HM. I tired all sorts of techniques but nothing is working.Let me give you situation.

[FaT3oYCG]

in some coding routines true is sometimes a substitute for the value of 1, therefore is ogg.eos() returns 1 then both the if ogg.eos() and ogg.eos() == 1 then methods will work.

[Xteaph-N]

in some coding routines true is sometimes a substitute for the value of 1, therefore is ogg.eos() returns 1 then both the if ogg.eos() and ogg.eos() == 1 then methods will work.

Um guys, the following all mean the same in lua:

--True Statments
if ogg.eos() then
Ogg.play()
end

if ogg.eos() == true then
Ogg.play()
end

if ogg.eos() == 1 then
Ogg.play()
end


--False Statments
if not ogg.eos() then
Ogg.play()
end

if ogg.eos() == false then
Ogg.play()
end

if ogg.eos() == 0 then
Ogg.play()
end

ogg.eos() returns boolean. You can handle it like any other function that returns boolean.

[Predricted]

What, so he shouldn't make the game at all?

He shouldn't be composing his map as 480x272 images, but dynamically loading resources /is/ how one overcomes memory constraints...

I know what X-teaph means I tried Dynamicly but really amateur way I did this:

while gamemod=="playing" do
if player.x < 480 and player.x > -480 and player.y < 272 and player.y > -272 then
bg1=Image.load(images/background/1.png)
bg2=Image.load(images/background/2.png)
bg3=Image.load(images/background/3.png)
bg4=Image.load(images/background/4.png)
end
and so go on for the rest of the map
end

But it didn't help it slowed the game and showed errors, but I composed the 480*272 cause I thought I would save hell of time with it but damn no...
Well then I'll make it tile based no problem

[FaT3oYCG]

Um guys, the following all mean the same in lua:

--True Statments
if ogg.eos() then
Ogg.play()
end

if ogg.eos() == true then
Ogg.play()
end

if ogg.eos() == 1 then
Ogg.play()
end


--False Statments
if not ogg.eos() then
Ogg.play()
end

if ogg.eos() == false then
Ogg.play()
end

if ogg.eos() == 0 then
Ogg.play()
end

ogg.eos() returns boolean. You can handle it like any other function that returns boolean.

do you want a medal

I know what X-teaph means I tried Dynamicly but really amateur way I did this:

while gamemod=="playing" do
if player.x < 480 and player.x > -480 and player.y < 272 and player.y > -272 then
bg1=Image.load(images/background/1.png)
bg2=Image.load(images/background/2.png)
bg3=Image.load(images/background/3.png)
bg4=Image.load(images/background/4.png)
end
and so go on for the rest of the map
end

But it didn't help it slowed the game and showed errors, but I composed the 480*272 cause I thought I would save hell of time with it but damn no...
Well then I'll make it tile based no problem

yeah a tile engine / method is the best route to take, usually 16x16 pixel or 32x32 pixel images work best.

[yaustar]

ogg.eos() returns boolean. You can handle it like any other function that returns boolean.

Is the readme wrong then? It explicitly says it returns 1 or 0 which implies an integer, not a boolean which is an important distinction because 'notting' a 0 does not return true (tested on Lua 5.1.2).

foo = 0
if not foo then
    print("blah")
end

Nothing is printed.

As a side note, any non-zero integer in a expression is true but is not equal to the 'value' of true.

foo = -1;
if foo then
    print( "Blah")
end

Output is "Blah".

foo = -1;
if foo == true then
    print( "Blah")
end

Nothing is printed.

As I implied earlier, I wasn't sure how the function eos works under the hood in LuaPlayer and whether it only works if the music has been played at all. (HM really needs a IsPlaying function).

Try the following:

BG1 = Ogg.load("Music.ogg");
Ogg.play(BG1);

while true do	
	if Ogg.eos() == 1 then
		Ogg.play(BG1);
	end
end

[FaT3oYCG]

or switch to pge which is built for making games and just use a wav or mp3 as it directly has a function to loop a sound