Lua Programming Help Thread

[Ben93]

Do I have to use Intra.Font, cuz i got this error:

script.lua:3: bad argument #4 to 'new' (number expected, got no value

line 3 is

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

[dan369]

Color.new() now has 4 values, r,g,b,a. A = alpha, its the transparency value.

[Xperience007]

hi, I'm learning Lua and I need.

its same as an RPG, you click in something and your player moves to the place you clicked.

In this example, the whitebox is your mice arrow and the greenbox is your player. I want to make the green player go to the place where the whitebox pressed X button.

greenn=Color.new(0,255,0)
whitee = Color.new(255,255,255) 


whitebo = Image.createEmpty(20,20)
whitebo:clear(whitee)

greenbo = Image.createEmpty(10,10)
greenbo:clear(greenn)




--Boxposition
White = {}
White[1] = { x = 200, y = 100 }
Green = {}
Green[1] = { x = 100, y = 150 }


------WhiteBox
function whitebox()
pad = Controls.read()
screen:blit(White[1].x, White[1].y, whitebo)
if pad:up() then
White[1].y = White[1].y - 4
end
if pad:down() then
White[1].y = White[1].y + 4
end
if pad:left() then
White[1].x = White[1].x - 4
end
if pad:right() then
White[1].x = White[1].x + 4
end
end

--------GreenBox--followwhite-
function greenbox()
screen:blit(Green[1].x, Green[1].y, greenbo)

if pad:cross() and White[1].x > Green[1].x then
Green[1].x = Green[1].x + 2
end
if pad:cross() and White[1].x < Green[1].x then
Green[1].x = Green[1].x - 2
end
if pad:cross() and White[1].y > Green[1].y then
Green[1].y = Green[1].y + 2
end
if pad:cross() and White[1].y < Green[1].y then
Green[1].y = Green[1].y - 2
end
end
-----------------

while true do
screen:clear()

whitebox()
greenbox()

screen.waitVblankStart()
screen.flip()
end

in this code, the greenbox will follow the whitebox if Cross is pressed. I want to be like an RPG: if I click somewhere on the screen with the whitebox, the greenbox will follow the place where whitebox was when Cross was pressed.

I hope i get help, thank you

[TurtlesPwn]

Color.new() now has 4 values, r,g,b,a. A = alpha, its the transparency value.

The alpha value should be optional and default to 0. For simple purposes of declaring red, green, black, white, etc, it's not needed. I guess HMv2 is dumb in this sense.

@xperience: Follow this logic outline and turn it into code:
1. Let player move white box around. Do not move green box
2. If player presses x then
3. Save the coordinates of the white box
4. If the green box is not at that same saved position of the white box then
5. Move the green box a little bit closer
6. Repeat 4 and 5 until the green box is where the white box used to be

If you are not yet able to turn that into code then I suggest you read some more general game concept or basic tutorial type documents.

[Xperience007]

The alpha value should be optional and default to 0. For simple purposes of declaring red, green, black, white, etc, it's not needed. I guess HMv2 is dumb in this sense.

@xperience: Follow this logic outline and turn it into code:
1. Let player move white box around. Do not move green box
2. If player presses x then
3. Save the coordinates of the white box
4. If the green box is not at that same saved position of the white box then
5. Move the green box a little bit closer
6. Repeat 4 and 5 until the green box is where the white box used to be

If you are not yet able to turn that into code then I suggest you read some more general game concept or basic tutorial type documents.

the only thing i dont know yet is
3. Save the coordinates of the white box

[TurtlesPwn]

someothervariablex = whiteboxx
someothervariabley = whiteboxy

[dan369]

If the alpha value was defaulted to 0 we wouldn't see or image. Yeah it is stupid that it isn't optional.

[TurtlesPwn]

If the alpha value was defaulted to 0 we wouldn't see or image. Yeah it is stupid that it isn't optional.

Yea it defaults to 255, either way it should default to something in HM, most people don't care about transparency for simple colors.

[Ben93]

just using hmv2 and it kinda sucks is you where used to hm8
It just got harder instead of easier, now transforming my script to work with hmv2

[slicer4ever]

why not give pge a chance than?

[Ben93]

pge?

EDIT: screen.waitVblankStart(50 0) worked with hm8 so the psp would wait for 500msecs, but i seems that it doesn't work with hm v2
should i use System.sleep(500) ?

another thing:

while true do
screen.clear(0 )
screen.startDraw()
Image.blit(0,0,background)
screen.endDraw()
screen.flipscreen()
screen.waitVblankStart()

is "while true do" necessary?

[dan369]

Do but it in simple terms: PGE is da ****!
Visit Phoenix Game Engine - Home

[Digikid13]

It would be easier if you used System.sleep(500)

It is only necessary if you want it to loop forever.

while true do
screen.clear(0)
screen.startDraw()
Image.blit(0,0,background)
screen.endDraw()
screen.flipscreen()
end --Missed this.

[Xperience007]

@xperience: Follow this logic outline and turn it into code:
1. Let player move white box around. Do not move green box
2. If player presses x then
3. Save the coordinates of the white box
4. If the green box is not at that same saved position of the white box then
5. Move the green box a little bit closer
6. Repeat 4 and 5 until the green box is where the white box used to be

If you are not yet able to turn that into code then I suggest you read some more general game concept or basic tutorial type documents.

Thanks, I got what I wanted. I only need 1 more help.

how can I make the green box do a 360 degrees turn instead of
y = y + 2
y = y - 2
x = x + 2
x = x - 2 ?

here is the code:

greenn=Color.new(0,255,0)
whitee = Color.new(255,255,255) 


whitebo = Image.createEmpty(20,20)
whitebo:clear(whitee)

greenbo = Image.createEmpty(10,10)
greenbo:clear(greenn)




--Boxposition
White = {}
White[1] = { x = 200, y = 100 }
Green = {}
Green[1] = { x = 100, y = 150 }


------WhiteBox
function whitebox()
pad = Controls.read()
screen:blit(White[1].x, White[1].y, whitebo)
if pad:up() then
White[1].y = White[1].y - 4
end
if pad:down() then
White[1].y = White[1].y + 4
end
if pad:left() then
White[1].x = White[1].x - 4
end
if pad:right() then
White[1].x = White[1].x + 4
end
end

--------GreenBox--followwhite-
function greenbox()
screen:blit(Green[1].x, Green[1].y, greenbo)

if pad:cross() and White[1].x > Green[1].x then
Green[1].x = Green[1].x + 2
end
if pad:cross() and White[1].x < Green[1].x then
Green[1].x = Green[1].x - 2
end
if pad:cross() and White[1].y > Green[1].y then
Green[1].y = Green[1].y + 2
end
if pad:cross() and White[1].y < Green[1].y then
Green[1].y = Green[1].y - 2
end
end
-----------------

while true do
screen:clear()

whitebox()
greenbox()

screen.waitVblankStart()
screen.flip()
end

can you edit the code and make it 360 degres turn?

Thanks

[TurtlesPwn]

You mean so that it gradually moves the distance to the destination so that it goes in one straight line? Use sin and cos to calculate the correct distances.

[Xperience007]

You mean so that it gradually moves the distance to the destination so that it goes in one straight line? Use sin and cos to calculate the correct distances.

yes, a straight line.

thx

[Ben93]

It would be easier if you used System.sleep(500)

It is only necessary if you want it to loop forever.

while true do
screen.clear(0)
screen.startDraw()
Image.blit(0,0,splash)
screen.endDraw()
screen.flipscreen()
System.sleep(3000)
end --Missed this.

I was already using system.sleep by now
Yeah, looping forever, but i doesn't work whitout while true do

After the splash i have to put this:

while true do
pad = Controls.read()
if pad:start() then
	break
end

if pad:up() and done == false then

System.unassign("flash0:")
System.assign("flash0:", "lflash0:0,0", "flashfat0:")
System.copyFile("ms0:/PSP/GAME/Recovery_prx_flasher/recovery1/recovery.prx","flash0:/vsh/module/recovery.prx",0) 
System.shutdown()
done = true end
if done == false then

screen.clear(0)
screen.startDraw()
Image.blit(0,0,background)
screen.endDraw()
screen.flipscreen()
screen.waitVblankStart()

screen.print(10, 10, "Press up to flash recovery menu 1 and shut down",0.5,red,0) 
screen.flipscreen()
screen.waitVblankStart()
end

I just won't work, whatever i try, it only shows the splash/ shows alternating splash and background/shows only last tekst of loading screen etc etc

Who helps me?

[Digikid13]

You were just missing While ... Do Statment.

while true do
pad = Controls.read()
if pad:start() then
	break
end

while not done --This should work
if pad:up() and done == false then

System.unassign("flash0:")
System.assign("flash0:", "lflash0:0,0", "flashfat0:")
System.copyFile("ms0:/PSP/GAME/Recovery_prx_flasher/recovery1/recovery.prx","flash0:/vsh/module/recovery.prx",0) 
System.shutdown()
done = true end
if done == false then

screen.clear(0)
screen.startDraw()
Image.blit(0,0,background)
screen.endDraw()
screen.flipscreen()
screen.waitVblankStart()

screen.print(10, 10, "Press up to flash recovery menu 1 and shut down",0.6,red,0) 
screen.flipscreen()
screen.waitVblankStart()
end
end --and this
System.quit()

[dan369]

Why have two loops? You have an clause & infinite loop. You really only need one.

while not done do
      --insert ifs, functions etc.

      --put if start then break in here as well. 
screen.waitVblankStart()
end

Also, i don't know why your messing around wuth flash0 in the first place.

[Xperience007]

You mean so that it gradually moves the distance to the destination so that it goes in one straight line? Use sin and cos to calculate the correct distances.

can you help me? I tryed but fail

[TurtlesPwn]

can you help me? I tryed but fail

Please refer to my signature.

[Ben93]

Hi it's me again.

Has somebody an idea how i could disable a button?

tnx

EDIT: System.homePopup(0)

so nvm

[dan369]

Hi it's me again.

Has somebody an idea how i could disable a button?

tnx

Just don't use it.

[SafariAl]

Just don't use it.

He wanted to disable the possible use of the button in his program, if I'm not mistaken.

[corytheidiot1]

Can anyone tell me why I can't write to flash0 with LPHMv2? I don't get any error or anything. I have assigned the flash like I need to, but it doesn't do anything when I use the System.copyFile() function. I REALLY need to get this to work. I need to overwrite a file in flash0. Any help is greatly appreciated.

[dan369]

He wanted to disable the possible use of the button in his program, if I'm not mistaken.

I don't know any way...I presume he wants to disable a button because he doesn't want to use it, then don't.

[jumper6]

can you help me? I tryed but fail

just try it again,, it works for me

[LXD]

can you help me? I tryed but fail

to get the right x and y position you have to use sin and cos like this

x = (math.sin ( angle *(math.pi/180))* radius )
y = (math.cos( angle *(math.pi/180))* radius )

Regards
LXD
-=Double Post Merge =-

Hi it's me again.

Has somebody an idea how i could disable a button?

tnx

do you mean something like disabling the note or the screen buttons ?
i dont think that there is a way to do that in lua

the only thing you could try is to do the contrary effect of the button

e.g.
if pad:screen() then
System.setBrightness(brig htness)
else
brightness = System.getBrightness()
end


Regards
LXD

[wethegreenpeople]

I figured out my other two problems all by myself but now i have another problem, i can't get the sound(s) to work this is the code im using boltsnd = Sound.load("pictures/circle.wav") pictures is my folder and circle is the name of my file, but it won't load i want to do either one of these things


1. Be able to press a button and hear a sound

2. Hear music in the background without pressing a button



So if any one could please give me the code for either one of those things and tell me if there is anything i need to do that would be great thanks!

[yaustar]

i can't get the sound(s) to work this is the code im using boltsnd = Sound.load("pictures/circle.wav") pictures is my folder and circle is the name of my file, but it won't load

How do you know it hasn't been loaded?