Lua Programming Help Thread

[scionsamurai]

noob question: i want to make part of an image transparent. and i am using gimp image editor (works alright) and i want to make a middle part of the image transparent (or just gone completly) any tips?

[dan369]

Well in paint.net you just have to select the area you want transparent, & cut it. If you want it partiallh transparent then you simply change the alpha value in the paint window (the window were you click to chose your colours & theres the colour circle.)
Don't know about gimp though, to save time install paint.net, once you've finished unistall it

[thecraziness1]

the default password is ur psp s system nickname but i wanted 2 make an option 2 change the password from within the program so people w/out knowledge of lua wont have 2 manually open the lua file 2 change the password . ive tried both though w/file:read("*a") and file:read(*n) but it just seems 2 be having problems comparing the osk input with reading the file

[scionsamurai]

k. thanks for the help dan369

[Xteaph-N]

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

[dan369]

it'll only play if your holding circle add this:

oldpad = Controls.read()

--in main loop
if pad:circle() and not oldpad:circle() then
         --do stuff
end

--near the end of your script
oldpad = pad

[Xteaph-N]

it'll only play if your holding circle add this:

oldpad = Controls.read()

--in main loop
if pad:circle() and not oldpad:circle() then
         --do stuff
end

--near the end of your script
oldpad = pad

No the way I mentioned above would not, as it is state based. Also this really has nothing to do with the problem.

[dan369]

Yes it does, when you press circle the state would be true, when you let go it'll go to false. I've been doing this for about 2 and a half years now, i think i can tell you the problem (sarcasm).
Use tostring to print 'music' to the screen, that'll show you that i'm correct.

[scionsamurai]

i have a question about zoom. i have tried adding to size by just pressing the button (wich i didnt get to work :P)but i was wondering if their was a code i could implement to make it steadily zoom.
heres the code if it helps (i was just messing around with code to make this box move around screen)

blue=Color.new(0,0,255)
i = 32
box=Image.createEmpty(i,i)
box:clear(blue)
Box={x = 30, y = 100}
screenwidth = 480 - box:width()
screenheight = 272 - box:width()
function move()
  if Box then
  Box.x = Box.x - 1
  end
end
function moveUp()
  if Box then
  Box.y = Box.y - 1
  end
end 
function collide()
   if Box.x < 0 then
   Box.x = Box.x + 480
   end
end   
function collideUp()
  if Box.y < 0 then
  Box.y = Box.y + 272
  end
end 
while true do
   pad = Controls.read()
   screen:clear()
   screen:blit(Box.x,Box.y,box)
   if pad:start() then
      break
   end
   if pad:r() then
   i = i + 50
   end
   collide()
   collideUp()
   move()
   moveUp()
screen.waitVblankStart()
screen.flip()
end

[Xteaph-N]

Yes it does, when you press circle the state would be true, when you let go it'll go to false. I've been doing this for about 2 and a half years now, i think i can tell you the problem (sarcasm).
Use tostring to print 'music' to the screen, that'll show you that i'm correct.

That's completely false. I think you should review my code.

It doesn't just magically become false for no reason. The only way that would happen is if I put the music variable in my loop which I obviously didn't do.


Now onto the problem I am having. Whenever I use Ogg.stop() I can't use Ogg.play(). So I see no way of making a loop. I've tried making another while loop. I've tried loading dummy music file in addition to my other music file. I've tried checking to see when the music stops then using a Ogg.play(). and a whole lot more.

i have a question about zoom. i have tried adding to size by just pressing the button (wich i didnt get to work :P)but i was wondering if their was a code i could implement to make it steadily zoom.
heres the code if it helps (i was just messing around with code to make this box move around screen)

blue=Color.new(0,0,255)
counter = 0
i = 32
box=Image.createEmpty(i,i)
box:clear(blue)
Box={x = 30, y = 100}
screenwidth = 480 - box:width()
screenheight = 272 - box:width()
function move()
  if Box then
  Box.x = Box.x - 1
  end
end
function moveUp()
  if Box then
  Box.y = Box.y - 1
  end
end 
function collide()
   if Box.x < 0 then
   Box.x = Box.x + 480
   end
end   
function collideUp()
  if Box.y < 0 then
  Box.y = Box.y + 272
  end
end 
while true do
   pad = Controls.read()
   screen:clear()
   screen:blit(Box.x,Box.y,box)
   if pad:start() then
      break
   end
   if pad:r() then
   i = i + 50
   end
   collide()
   collideUp()
   move()
   moveUp()
screen.waitVblankStart()
screen.flip()
end

This looks fine if you want it to "steadily" zoom. (I assume you want to control the rate) Just edit your i = i + 50. 50 seems a bit much though I'd try 4 or something like that.

But if you want maximum control over the rate at which it zooms try:

counter = 0

function BoxZoom()
counter = counter + 1

 if counter == 5 then
 i = 2
 end
 if counter == 10 then
 i = 3
 counter = 0
 end
end

The way above would give absolute control over the rate at which your box zooms. You could have it zoom fast then slow.

[yaustar]

Yes it does, when you press circle the state would be true, when you let go it'll go to false. I've been doing this for about 2 and a half years now, i think i can tell you the problem (sarcasm).
Use tostring to print 'music' to the screen, that'll show you that i'm correct.

Sorry dan, but you are wrong in this case. The flag music ONLY gets assigned false when cross is pressed.

However Xteaph-N, you do realise that play or stop is getting called EVERY frame depending on the state of the flag which isn't recommended and to be honest, I am surprised it even works as it is now.

Add another flag that represents if the music is playing or not so you can correctly decide when to call play and stop.

[dan369]

Yeah my bad, just realised what he has done. He shouldn't use stop, he should be using pause that is un-less you want it to start from the beginning.
I got it muddled up, i thought he set music to false but he set it to true at the beginning, but like yaustar said the 'state' only changes whilst your pressing cross.

[Xteaph-N]

Sorry dan, but you are wrong in this case. The flag music ONLY gets assigned false when cross is pressed.

However Xteaph-N, you do realise that play or stop is getting called EVERY frame depending on the state of the flag which isn't recommended and to be honest, I am surprised it even works as it is now.

Add another flag that represents if the music is playing or not so you can correctly decide when to call play and stop.

I could call it out differently like so:

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

music = true

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

while true do
pad = Controls.read()

if pad:circle() then
music = true
end

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

However this doesn't help. Whenever I use Ogg.stop() function I can no longer use Ogg.play(). I am completely stumped as how I could make a loop; being this as the case.

I've already tried multiple things in and out of my loop and none seem to work.

Yeah my bad, just realised what he has done. He shouldn't use stop, he should be using pause that is un-less you want it to start from the beginning.
I got it muddled up, i thought he set music to false but he set it to true at the beginning, but like yaustar said the 'state' only changes whilst your pressing cross.

Ok, this is really upsetting me now. Go back and read the last 3 posts I've made in this thread. If you've done that you will see I've been repeating myself exclusively to you. In all 3 posts they've been about a "music loop". I don't see how you could not have gotten this. It was quite plan. There is no point in trying to help someone if you don't pay attention to what they are saying.

[scionsamurai]

thanks for the response Xteaph-N. but for some reason it still doesnt zoom at all. it stays at one size. here is the code now

blue=Color.new(0,0,255)
i = 32
box=Image.createEmpty(i,i)
box:clear(blue)
Box={x = 30, y = 100}
screenwidth = 480 - box:width()
screenheight = 272 - box:width()
counter=0
function BoxZoom()
counter=counter+1
   if counter == 5 then
   i = 2
   end
   if counter == 10 then
   i = 3
   counter = 0
   end
end
function move()
  if Box then
  Box.x = Box.x - 1
  end
end
function moveUp()
  if Box then
  Box.y = Box.y - 1
  end
end 
function collide()
   if Box.x < 0 then
   Box.x = Box.x + 480
   end
end   
function collideUp()
  if Box.y < 0 then
  Box.y = Box.y + 272
  end
end 
while true do
   pad = Controls.read()
   screen:clear()
   screen:blit(Box.x,Box.y,box)
   if pad:start() then
      break
   end
   if pad:r() then
   i = i + 5
   end
   BoxZoom()
   collide()
   collideUp()
   move()
   moveUp()
screen.waitVblankStart()
screen.flip()
end

[dan369]

I help loads of people, i made one mistake & you come down on me. I'm not going to even bother now.

[Xteaph-N]

thanks for the response Xteaph-N. but for some reason it still doesnt zoom at all. it stays at one size. here is the code now

blue=Color.new(0,0,255)
i = 32
box=Image.createEmpty(i,i)
box:clear(blue)
Box={x = 30, y = 100}
screenwidth = 480 - box:width()
screenheight = 272 - box:width()
counter=0
function BoxZoom()
counter=counter+1
   if counter == 5 then
   i = 2
   end
   if counter == 10 then
   i = 3
   counter = 0
   end
end
function move()
  if Box then
  Box.x = Box.x - 1
  end
end
function moveUp()
  if Box then
  Box.y = Box.y - 1
  end
end 
function collide()
   if Box.x < 0 then
   Box.x = Box.x + 480
   end
end   
function collideUp()
  if Box.y < 0 then
  Box.y = Box.y + 272
  end
end 
while true do
   pad = Controls.read()
   screen:clear()
   screen:blit(Box.x,Box.y,box)
   if pad:start() then
      break
   end
   if pad:r() then
   i = i + 5
   end
   BoxZoom()
   collide()
   collideUp()
   move()
   moveUp()
screen.waitVblankStart()
screen.flip()
end

Oh, your not calling my function right. This is a way you can call it:

blue=Color.new(0,0,255)
i = 32
box=Image.createEmpty(i,i)
box:clear(blue)
Box={x = 30, y = 100}
screenwidth = 480 - box:width()
screenheight = 272 - box:width()
counter=0
function BoxZoom()
counter=counter+1
   if counter == 5 then

--This is why it wasn't zooming -- Also causes slow increase
   i = i + 2 -- Rate of zoom variable
   end
   if counter == 10 then

--This will be a faster zoom
   i = i + 5 -- Rate of zoom variable
   counter = 0
   end
end
function move()
  if Box then
  Box.x = Box.x - 1
  end
end
function moveUp()
  if Box then
  Box.y = Box.y - 1
  end
end 
function collide()
   if Box.x < 0 then
   Box.x = Box.x + 480
   end
end   
function collideUp()
  if Box.y < 0 then
  Box.y = Box.y + 272
  end
end 
while true do
   pad = Controls.read()
   screen:clear()
   screen:blit(Box.x,Box.y,box)
   if pad:start() then
      break
   end

--Pressing R activates the function 
   if pad:r() then
   BoxZoom()
   end
   
collide()
   collideUp()
   move()
   moveUp()
screen.waitVblankStart()
screen.flip()
end

Also I realized I made a simple mistake with the BoxZoom() function which is also fixed here. I've also added comment where I changed things.

I also want you to know the way in which it grows will be slow then fast, slow then fast et cetera. But you can easilly change that to what ever you want.

I help loads of people, i made one mistake & you come down on me. I'm not going to even bother now.

*faceplam* Uhg, read my last post. You made 5 mistakes.(not including this one)

1. Ignoring my question
2. Your answer was wrong
3. Ignoring my question again
4. Your rebuttal was wrong
5. Ignoring my question again

Also I'm only upset because you had no idea(it seemed) what the problem was. I'm sure you help a lot of people, I've also helped lots of people too in hardware. However I was only pointing out something as a matter of fact. I wasn't "coming down" on you.

Here is what I said:

Ok, this is really upsetting me now. Go back and read the last 3 posts I've made in this thread. If you've done that you will see I've been repeating myself exclusively to you. In all 3 posts they've been about a "music loop". I don't see how you could not have gotten this. It was quite plan. There is no point in trying to help someone if you don't pay attention to what they are saying.

All of this is fact, there was no mean intention in it.

Too further prove my point; I could have said all kinds of mean factual statements like "You are just being plain incompetent". But I chose instead to not use that version. Your just acting childish right now. I could continue to explain but I think this is enough.

[dan369]

Look now i'm going to ignore that post, seeing as if i wanted to i could point out loads of mistakes with the things you have coded but i'll leave it at that.
Now if you actually used the simplest of debugging, just simply printing 'music' to the screen then you'd see that there is a problem with Hmv2. I tried my own program, similar to yours. When i press circle, using your script, music got set to 'true' so it should play. But it didn't, this isn't a code problem but i think it's a HM problem. Also i tried to just pause the music for a moment but neither did that work, it plays tiny parts of the song instead of just pausing & re-playing when i feel like it.

Note: music was set to false when i tried to set music back to true. Just to say

Now let me point out the mistakes seeing as you do it with me:
if statements are always:

   if somethingIsTrue then
         do stuff
   end

There's no need for the == true part. For false you'd do this

if not something then
     do something
end

'Music' is a bad variable name, it doesn't tell me anything about what it is used for only that it is used in connection with 'music'. Something like 'musicIsPlaying'. Also indent and use spaces because your code is all together and looks rather ugly.

Edit: Though there is a possibility that the code is wrong, i don't use Hmv2 mostly so my code my not be 100% correct but, with what i have it seemed that it was a Hm problem.

[scionsamurai]

k. i tried making the changes and it didnt work. then i tried copying ur code and it still didnt work. so im thinking it is the way im "blit"ing the box to the screen or my version of lua player. i have luaplayer 0.20. any more suggestions would be appreciated. btw thanks for the responses Xteaph-N, :)

[Xteaph-N]

Look now i'm going to ignore that post, seeing as if i wanted to i could point out loads of mistakes with the things you have coded but i'll leave it at that.
Now if you actually used the simplest of debugging, just simply printing 'music' to the screen then you'd see that there is a problem with Hmv2. I tried my own program, similar to yours. When i press circle, using your script, music got set to 'true' so it should play. But it didn't, this isn't a code problem but i think it's a HM problem. Also i tried to just pause the music for a moment but neither did that work, it plays tiny parts of the song instead of just pausing & re-playing when i feel like it.

Note: music was set to false when i tried to set music back to true. Just to say

Now let me point out the mistakes seeing as you do it with me:
if statements are always:

   if somethingIsTrue then
         do stuff
   end

There's no need for the == true part. For false you'd do this

if not something then
     do something
end

'Music' is a bad variable name, it doesn't tell me anything about what it is used for only that it is used in connection with 'music'. Something like 'musicIsPlaying'. Also indent and use spaces because your code is all together and looks rather ugly.

Edit: Though there is a possibility that the code is wrong, i don't use Hmv2 mostly so my code my not be 100% correct but, with what i have it seemed that it was a Hm problem.

I already know I don't organize my code very well. But this is only superficial both ways work the same. The reason you see me doing it like:

"Music == true"

is because I'm not always using a boolean statement sometimes I have things like:

"Music == BGM1"
"Music == BGM2"

I have these statements which aren't boolean, and so it wouldn't make sense to put Music_Is_Playing. Besides I like to read spaghetti code. Though your correct if we where only doing boolean, which as I stated will not be the case. As for indentation, I simply hate them. I like them in C/C++, but in lua I it's hard for my eyes to look at it.


I always thought this was a problem with the player itself. I tried asking the dev of the player and got no reply as of this post.

k. i tried making the changes and it didnt work. then i tried copying ur code and it still didnt work. so im thinking it is the way im "blit"ing the box to the screen or my version of lua player. i have luaplayer 0.20. any more suggestions would be appreciated. btw thanks for the responses Xteaph-N, :)

I see I just tried to make it in luaplayer 0.20, and you are right. The problem is in the way it blits. The variable i is increasing but the box is not for some reason. I guess that part is not looping, just how it was made I guess.

Luaplayer HM has a resize function. Image.resize() example:

Image.resize(100,100,box)

Also this works on PNG image files too!

[Nielkie]

@dan No need to get defensive. You're not exactly the best coder yourself.

You too, Xteaph-N.

Anyways,

As for indentation, I simply hate them. I like them in C/C++, but in lua I it's hard for my eyes to look at it.

Indent. Seriously.

[scionsamurai]

darn i was hoping my guess was wrong. is coding for hm much different than coding for just regular? and if i was gonna go off what i know, should i learn hm or pge? suggestions?

[Xteaph-N]

darn i was hoping my guess was wrong. is coding for hm much different than coding for just regular? and if i was gonna go off what i know, should i learn hm or pge? suggestions?

HM is going to be most similar to what your using now. PGE is much different then HM. But PGE is going to be your best bet. It's a bit more complex but the trade of is certainly worth it. But for what your doing PGE might not have the resize function.

But I think this is a good solution to your problem in luaplayer 0.20.

Also I was thinking this might also be a solution:

blue=Color.new(0,0,255)

box1=Image.createEmpty(32,32)
box1:clear(blue)

box2=Image.createEmpty(47,47)
box2:clear(blue)

box3=Image.createEmpty(62,62)
box3:clear(blue)

box4=Image.createEmpty(77,77)
box4:clear(blue)


box5=Image.createEmpty(92,92)
box5:clear(blue)

Box={x = 30, y = 100}

Image_Change = box1
screenwidth = 480
screenheight = 272
counter=0

function BoxZoom()
counter=counter+1
if counter == 5 then
Image_Change = box2
end
if counter == 10 then
Image_Change = box3
end
if counter == 15 then
Image_Change = box4
end
if counter == 20 then
Image_Change = box5
counter = 0
end
end

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

if pad:r() then
BoxZoom()
end

screen:blit(Box.x,Box.y,Image_Change)

if pad:start() then
break
end
screen.waitVblankStart()
screen.flip()
end

Tell me what you think?

Anyways,

Indent. Seriously.

I'm not going to do it. It really disorients me. Besides I bet none will try to learn from my lua script anyway.

[scionsamurai]

YES. This will work. all i need to do is switch image back and forth. while holding r. thanks for the help. :)

[Xteaph-N]

YES. This will work. all i need to do is switch image back and forth. while holding r. thanks for the help. :)

Great! If you need any extra help feel free to PM me.

[dan369]

@dan No need to get defensive. You're not exactly the best coder yourself.

You too, Xteaph-N.

Anyways,

Indent. Seriously.

No but i'm not the worst either. Anyway lets leave it at that.

@Xteaph-N - Did you even get it working in the end? Though like with most HM things, it's hard to give a good explaination as the docs themselves aren't that good.

[scionsamurai]

sorry double post. please delete this one

[Xteaph-N]

No but i'm not the worst either. Anyway lets leave it at that.

@Xteaph-N - Did you even get it working in the end? Though like with most HM things, it's hard to give a good explaination as the docs themselves aren't that good.

Well, no there is a glitch in HM. You can't call out Ogg.stop() unless you plan on stopping forever. But I found a pretty good way around this. I'll just compose the music myself in lua.

Let me demonstrate an example:

Piano_A = Sound.load("A.wav")
Piano_B = Sound.load("B.wav")
Piano_C = Sound.load("C.wav")
Piano_D = Sound.load("D.wav")
Piano_E = Sound.load("E.wav")
Piano_F = Sound.load("F.wav")
Piano_G = Sound.load("G.wav")

Piano_AS = Sound.load("A#.wav")
Piano_BS = Sound.load("B#.wav")
Piano_CS = Sound.load("C#.wav")
Piano_DS = Sound.load("D#.wav")
Piano_ES = Sound.load("E#.wav")
Piano_FS = Sound.load("F#.wav")
Piano_GS = Sound.load("G#.wav")

Tempo = 1
Counter = 0

function BGM1()
Counter = Counter + Tempo

if Counter >= 100 and Counter <= 199 then
Piano_A:play()
end
if Counter == 200 and Counter <= 299 then
Piano_A:play()
end
if Counter == 300 and Counter <= 399 then
Piano_A:play()
end
if Counter == 400 and Counter <= 499 then
Piano_A:play()
end
--Et Cetera.....
end

while true do
pad = Controls.read
BGM1()

-- This increases the tempo of the song, I.E. Speed
if pad:right() then
Tempo = Tempo + .1
end

if pad:left() then
Tempo = Tempo - .1
end

screen.waitVblankStart()
end

This is just my concept I haven't actually done it yet, nor do I know the code above will work. Though this should work in theory. Even if this doesn't work it is obviously possible so I will do it.

[Nielkie]

That's a crappy way to do it.

noteNames = {'A', 'A#' 'B', 'C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#'}
pianoSounds = {}


for i, noteName in ipairs(noteNames) do
	pianoSounds[noteName] = Sound.load(noteName .. '.wav')
end


song = {
	{length = 1, name = 'E'},
	{length = 1, name = 'D'},
	{length = 1, name = 'C'},
	{length = 1, name = 'D'},
	{length = 1, name = 'E'},
	{length = 1, name = 'E'},
	{length = 2, name = 'E'}
}

for i, note in iparis(song) do
	pianoSounds[note.name]:play()
	wait(note.length)
end

[Xteaph-N]

That's a crappy way to do it.

noteNames = {'A', 'A#' 'B', 'C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#'}
pianoSounds = {}


for i, noteName in ipairs(noteNames) do
	pianoSounds[noteName] = Sound.load(noteName .. '.wav')
end


song = {
	{length = 1, name = 'E'},
	{length = 1, name = 'D'},
	{length = 1, name = 'C'},
	{length = 1, name = 'D'},
	{length = 1, name = 'E'},
	{length = 1, name = 'E'},
	{length = 2, name = 'E'}
}

for i, note in iparis(song) do
	pianoSounds[note.name]:play()
	wait(note.length)
end

Not long enough! Also I just simply hate the method in which you are doing this.

BTW this doesn't look legal in lua.

[Nielkie]

Huh?