Lua Programming Help Thread

[SG57]

no, montrob... that will work, but kills anymore possibilities of higher platforms... if using that mehtod that is...

Just use collision, if it collides with platform, then player.y = platform.y - 2 ish

That will not have it in the platform if u have a semi off picture...

Im planning on making a new lib that is just for math functions to minimize the questions and trouble with collision and rotation

[Grimfate126]

if true then
screen:blit(x1, y1, player2)
x1 = x1 + 2 
end

if true and pause == true then

screen:blit(x0, y0, up2)
screen.flip()
screen.waitVblankStart(10  )

screen:blit(x0, y0, up1)
screen.flip()
screen.waitVblankStart(10  )

y0 = y0 - 2 
end


if pad:up() then
pause = true
end

noone yet helped me yet, (i think noone knows how to fix it).
anyways, is there a way to make the up1 and up2 change after each move?

try this:

move = Timer.new()
move:stop()
move:reset()

if true then
screen:blit(x1, y1, player2)
x1 = x1 + 2 
end

move:start()
if true and pause == true then

if move:time() <= 15 then
screen:blit(x0, y0, up2)
end

if move:time() > 15 and move:time() < 30 then
screen:blit(x0, y0, up1)
end

if move:time() >= 30 then
y0 = y0 - 2 
move:reset() 
end

if pad:up() then
pause = true
end

[Glynnder]

in terms of the gravity thing i'd say, if x > whetever and x < whatever then
if y >= the number (i think 183) then y = 183
end
end

[EminentJonFrost]

I'm qouting my own edit:

player = {}
player.gravity = 160
player.y = 230
player.x = 50
player.jumpspeed = 10
player.jumpstate = "ground"


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

screen:blit(0,0,Background1)

if pad:r() and oldpad:r() ~= pad:r() then
bulletSetup()
end


if pad:left() then
player.x = player.x - 2
end
if pad:right() then
player.x = player.x + 2
end

if pad:cross() and player.jumpstate == "ground" then player.jumpstate = "jumping" end

if player.jumpstate == "jumping" then
player.jumpspeed = player.jumpspeed - 0.5
player.gravity = player.gravity - player.jumpspeed
end

if player.gravity < 0 then
player.jumpstate = "falling"
end

if player.gravity < 160 and player.jumpstate == "falling" then
player.gravity = player.gravity + (player.jumpspeed + 3)
end

if player.gravity == 160 then
player.jumpspeed = 10
player.jumpstate = "ground"
end

if player.gravity > 160 then player.gravity = 160 end

player.y = player.gravity

screen:blit(player.x,player.y,player1)
screen:blit(0,0,ground)

second_floor = {}
second_floor.y = 220 -- made it lower, just in case the player cant reach.
second_floor.x1 = 100
second_floor.x2 = 200

if player.y <= second_floor.y and player.x >= second_floor.x1 and player.x <= second_floor.x2  then
player.y = second_floor.y -- I forgot the ".y" last time.
end

try it now.
i made two changes from the last time, one correcting a stupid mistake on my part.

[JoeDaStudd]

Whats the biggest file u can play in homebrew games?

[natan333]

try this:

move = Timer.new()
move:stop()
move:reset()

if true then
screen:blit(x1, y1, player2)
x1 = x1 + 2 
end

move:start()
if true and pause == true then

if move:time() <= 15 then
screen:blit(x0, y0, up2)
end

if move:time() > 15 and move:time() < 30 then
screen:blit(x0, y0, up1)
end

if move:time() >= 30 then
y0 = y0 - 2 
move:reset() 
end

if pad:up() then
pause = true
end

thx very much
my code now is

if pad:up() then
move:start()
y0 = y0 - 2
screen:blit(x0, y0, up1)
end


if pad:up() and move:time() > 0 then
screen:blit(x0, y0, up2)
end

if pad:up() and move:time() > 150 then
screen:blit(x0, y0, up1)
end

if pad:up() and move:time() > 300 then

move:reset()
end

and it works like a charm :Jump:


but ... the picture is buggy
it dosent move the same as if its stopped
like: There is a guy, if i move it up, some of his picture will mess up and goes down a little.
if i press down, his foot get messtup and it goes up inside his body (so it disapear)

is this is what supposed to happend or is there a code to fix it ?

[Altair]

depends on what language you're coding it in. If its in LUA it depends on what kind of file aswell. In C I dont know but i think as long as it doesn't exceed the PSP's memory it'll work, but I dont know that, its just a guess.

[natan333]

this is the code is to tell what i mean

black = Color.new(0,0,0)
up1 = Image.load("DotValley/up1.png")
player1 = Image.load("DotValley/player1.png")

x0 = 140
y0 = 150


while true do
screen:clear(black)
pad = Controls.read()
---
screen:blit(x0, y0, player1)

------------------
if pad:up() then
y0 = y0 - 2
screen:blit(x0, y0, up1)
end

---

if pad:down() then
y0 = y0 + 2
screen:blit(x0, y0, up1)
end
------------------

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

when up1 is going up, it will be different from going down.

or is there a code that i have to add to correct it ?

[PSPduh]

natan333, I am not sure if you should have screen:blit everytime you press up or down. I think because screen:blit(x0,y0,image) is under while true do, it will update the x0 and the y0. Just a guess. So it would be up and donw just without the screen:blit.

[natan333]

hmm well, i toke out both "screen:blit(x0, y0, up1)"
and left out with "screen:blit(x0, y0, player1)" only and it does the same thing

[Electro]

hmm well, i toke out both "screen:blit(x0, y0, up1)"
and left out with "screen:blit(x0, y0, player1)" only and it does the same thing

Try This

black = Color.new(0,0,0)
up1 = Image.load("DotValley/up1.png")
player1 = Image.load("DotValley/player1.png")

x0 = 140
y0 = 150


while true do
screen:clear(black)
pad = Controls.read()
---
screen:blit(x0, y0, player1)
screen:blit(x0, y0, up1)

------------------
if pad:up() then
y0 = y0 - 2
end

---

if pad:down() then
y0 = y0 + 2
end
------------------

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

[EminentJonFrost]

Try This

black = Color.new(0,0,0)
up1 = Image.load("DotValley/up1.png")
player1 = Image.load("DotValley/player1.png")

x0 = 140
y0 = 150


while true do
screen:clear(black)
pad = Controls.read()
---
screen:blit(x0, y0, player1)
screen:blit(x0, y0, up1)

------------------
if pad:up() then
y0 = y0 - 2
end

---

if pad:down() then
y0 = y0 + 2
end
------------------

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

??
Wont that just make the "up1" image blit right on the "player1" image and never leave?

[Electro]

oops,, i didnt read the problem right,,

what is up sopposed to be?
is it like him jumping?

[EminentJonFrost]

oops,, i didnt read the problem right,,

what is up sopposed to be?
is it like him jumping?

yep.
but other than that, I dont fully get what it is he's trying to do.
He said something about wanting it to appear different when going down then from when its jumping.
(I'm guess, he wants to make it look like the player is falling, in which case, all need do is make a new image that looks like its falling, and blit it when you press down.)

[Electro]

for that i would use a timer
(this is what I did in Serve N Go)
this is also a 2 animation job

if Animation:time() >= 200 then
Animation:reset(0)
Animation:stop()
end

if pad:up() then 
	Animation:start()
	Direction = 1
	playery = playery - 8 
end
	
if pad:down() then 
	Animation:start()
	Direction = 2
	playery = playery + 8 
end 

	if Animation:time() > 100 and Direction == 2 then
			screen:blit(x, y, up2)
		elseif Direction == 2 then
			screen:blit(x, y, up1)
	end

	if Animation:time() > 100 and Direction == 2 then
			screen:blit(x, y, down2)
		elseif Direction == 1 then
			screen:blit(x, y, down1)
	end

[natan333]

hmm, you guys dint get it

it must be my pc and psp then

this is the picture "player1"


i put this picture to make it go up or down if i press the button.
the picture colors dont move correctly (they kinda get blurr and mix a little while moving)
some of the color get darker while moving

also noticed that you can see the colors not right in black screen and in white screen a little

[JoeDaStudd]

What is the largest mp3/wav file the luaplayer can play in a game?

[EminentJonFrost]

hmm, you guys dint get it

it must be my pc and psp then

this is the picture "player1"


i put this picture to make it go up or down if i press the button.
the picture colors dont move correctly (they kinda get blurr and mix a little while moving)
some of the color get darker while moving

also noticed that you can see the colors not right in black screen and in white screen a little

dont know..cant help you, sorry.

[Vaza]

What is the largest mp3/wav file the luaplayer can play in a game?

MP3 isnt playable
i think a WAV of 30secs MAX

[JoeDaStudd]

k, thank i thought it might be something like that

[PSPduh]

I have a question: How would you do something every time a timer increases by 10? So when the timer is 10 or 20 or 30 or 40, and only THOSE numbers that are evenly divisble by 10, something happens. Thank you for the help :icon_smil and i hope I didn't make it too :icon_sad: complicated. Sometimes I tend to over explain things.

[slicer4ever]

a loop like so:
for i = 1,4 do
if timer == 10 * i then
code
end
end

[PSPduh]

a loop like so:
for i = 1,3
if timer == 10 * i then
code
end
end

THANK you so much. This will help me with a game that I am not making. :) I just wanted to know. Although, I might try to create a game with that.
EDIT: how many milliseconds are in one second? I'm pretty sure it's not a million.

[slicer4ever]

no prob loops can come in handy=-)

@ your edit 100

[emericaska8r]

THANK you so much. This will help me with a game that I am not making. :) I just wanted to know. Although, I might try to create a game with that.
EDIT: how many milliseconds are in one second? I'm pretty sure it's not a million.

Yea, the prefix milli - means times (10 ^ -3)
so there are 0.001 seconds in a millisecond i quess.

[emericaska8r]

Hey can anyone help me with clearing an image on the screen, yet not the whole screen? Here is my code:

person = Image.load("player.png")

while true do
screen:blit(10,10, person)
pad = Controls.read()
if pad:cross() then
screen:clear(person)
screen.flip()
break
end
screen.flip()
end
screen.waitVblankStart(10 0)

[slicer4ever]

what's wrong? what error are you getting?

[ZereoX]

can you read:

Hey can anyone help me with clearing an image on the screen, yet not the whole screen

[Grimfate126]

hi guys, i have a question. i am loading like 18 high detail images, form a standalone LUA eboot. when i run it on luaplayer WINDOWS, it work awesome, when i try it on the psp, it can load more than nine images.it gives me an error. i have luaplayer .18

pls help me..

[Grimfate126]

sorry for double post, but have a prob.

i tried to do this:

for c = 1, 18 do

desert..c = Image.load("sp/desert"..c..".png")

end

but it says this:

Error: "=" expedcted near ".."

i know its not the image loading part. so what is worng??