Lua Programming Help Thread

[KKlicK]

i would try animation lib 3. but, you need a better understaanding of lua first..

I can personally vouch for ANIM Lib 3. It's a godsend because you don't can't load GIF's.

It's not at all hard to use, if all else fails, just overwrite Grimfate's test pictures and edit the number of frames in the Anilib.lua file.
-= Double Post =-
How can I keep the text from running of the side of the screen?

Also, I've been testing my code on Windows LUA Player, and now I want to try it on the PSP, but I have no clue as to how to incorporate ANIM Lib3 into it. Anyone want to help?

[Grimfate126]

I can personally vouch for ANIM Lib 3. It's a godsend because you don't can't load GIF's.

It's not at all hard to use, if all else fails, just overwrite Grimfate's test pictures and edit the number of frames in the Anilib.lua file.
-= Double Post =-
How can I keep the text from running of the side of the screen?

Also, I've been testing my code on Windows LUA Player, and now I want to try it on the PSP, but I have no clue as to how to incorporate ANIM Lib3 into it. Anyone want to help?

ANIM lib work fine for both windows lua and PSP. you shouldnt have to change anything.. just run it as usual and it should work fine.

if you have any problems, PM me.

[SG57]

Grimfate - Stop doubling your work. Get back to what you announced! ;)

[Grimfate126]

Grimfate - Stop doubling your work. Get back to what you announced! ;)

umm, last time i checked, i could do whatever i want. i dont need a 9th grader bossing me around. (NO, assault is not dead. i have a little.. surprise for you all. but ill show you later.)

[emericaska8r]

yes, i'm back into lua programming! :)

ok, here is my question, i am making a pong like game, yet there are four sides in play. I need to get my collisions correct so that when the ball bounces off any of the four bars it will change course. Here is my code, what is wrong with it?

function collision()
	collide = "false"
	if ballspot.x == 15 then
		for a = (barl.y), 50 do
			if ballspot.y == a then
				slope.x = slope.x * -1
				collide = "true"
			end
		end
		if collide == "false" then
			gameover()
		end
	end
	if ballspot.x == 465 then
		for a = (barr.y), 50 do
			if ballspot.y == a then
				slope.x = slope.x * -1
				collide = "true"
			end
		end
		if collide == "false" then
			gameover()
		end
	end
	if ballspot.y == 257 then
		for a = (bard.x), 50 do
			if ballspot.x == a then
				slope.y = slope.y * -1
				collide = "true"
			end
		end
		if collide == "false" then
			gameover()
		end
	end
	if ballspot.y == 15 then
		for a = (baru.x), 50 do
			if ballspot.x == a then
				slope.y = slope.y * -1
				collide = "true"
			end
		end
		if collide == "false" then
			gameover()   --you missed the ball
		end
	end
end

here barl is the left bar
barr is right, baru is upper, and bard is the lower bar.
The images for the bars are (10x50) and (50x10)

they are each located 5 pixels from the outer edge.
-= Double Post =-
also, if anyone wants to help me but doesn't understand all that, you can pm me and i will give you my entire code to look at. I trust nobody will steal it because the game is too simple, yet i think will be somewhat fun at the end...
-= Double Post =-
grrrr. sorry, i just don't really like the double post merge thing. i guess it helps the site, but still. anyway though, some1 please help

[FreePlay]

Well, I thought he had enough experience. After all, he made Text2Phone and fBrowser.

re: Text2Phone - the original program was written by someone named cools. According to the comments from the version of netlib that the Text2phone program uses, the actual netcall and sms stuff was written by PsPmad and youresam:

netlib v2.0
Copyright 2006 by youresam
Also thanks to PsPmad for help with netcall and netsms!

re: fBrowser

This is a file browser script made by fchaos and yoyomacy.

Guessing he made the images

[mark.sparky]

Hey when i run this script i get and error saying attempt to perform arithmetic on global 'player' ( a table value). This is near the start of the main loop where i say player.x = 48 and player.y = 186 . The error is on line 383 and the script is in the attachment

[AZeyC]

I need some help:

http://forums.qj.net/f-psp-developme...ion-77884.html

[mark.sparky]

why dont you try modifing this for your own use
http://evilmana.com/tutorials/codebase/name_entry.php
-= Double Post =-
now back on to my problem

-=Edit=-

Sorry i meant this site http://evilmana.com/tutorials/codeba...rd_program.php

[AZeyC]

I'd prefer to start from the base up any help?

[mark.sparky]

Any answers to my problem (post #4027)

[XteticX]

Lua is perty!

[mark.sparky]

what?

[eldiablov]

Lua is perty!

spam if i ever did see it:ROFL:

[xploren]

spam if i ever did see it:ROFL:

A reply to spam is just as bad as spamming itself. (Then why am I replying to a reply that replied to spam...?)

[eldiablov]

And i'm going to reply to your reply about my reply about XteticX's comment by singing "We love you southend we do !" But seriously i think you're an excellent dev so could you tell me whats wrong? I want my player to start at the bottom of the screen but he starts halfway on the screen. Here is my code :


blue = Color.new(0, 0, 255)
green=Color.new(0,255,0)
white = Color.new(255,255,255)
health = Image.load("images/Healthplayer1-1.png")
background = Image.load("images/background.png")
Player = Image.load("images/stick1.png")
Sprites = {}
Sprites[1] = Image.load("images/stick4.png")
Sprites[2] = Image.load("images/stick3.png")
Sprites[3] = Image.load("images/stick2.png")
Sprites[4] = Image.load("images/stick1.png")
Sprites[5] = Image.load("images/stick5.png")
Sprites[6] = Image.load("images/stick6.png")
Player = {}
Player.x = 7
Player.y = 230
Player.health = 100
Player.gravity = 185
Player.jumpspeed = 10
Player.jumpstate = "ground"
currentsprite = 4
while true do
pad = Controls.read()
screen:clear()
screen:blit(0, 0, background)
screen:blit(8, 18, health)
screenrint(15, 7, "1P Health", blue)
screen:blit(Player.x,Play er.y,Sprites[currentsprite])
-- Controls

if pad:right() and Player.x < 455 then
currentsprite = 4
Player.x = Player.x + 2
end
if pad:left() and Player.x > 7 then
currentsprite = 2
Player.x = Player.x - 2
end
if pad:up() and Player.y > 6 and Player.jumpstate == "ground" then Player.jumpstate = "jumping" and
currentsprite = 1
Player.y = Player.y - 2
end
if pad:down() and Player.y < 235 then
currentsprite = 3
Player.y = Player.y + 2
end
if pad:cross() then
currentsprite = 5
end
if pad:circle() and Player.jumpstate == "ground" then Player.jumpstate = "jumping" end
if pad:down() and pad:cross() and Player.y > 6 then
currentsprite = 6
end
if pad:start() then
os.exit()
end

-- Gravity function

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 < 230 and Player.jumpstate == "falling" then
Player.gravity = Player.gravity + (Player.jumpspeed + 3)
end

if Player.gravity == 230 then
Player.jumpspeed = 10
Player.jumpstate = "ground"
end

if Player.gravity > 230 then Player.gravity = 230 end

Player.y = Player.gravity

screen.waitVblankStart()
screen.flip()
end

[GuitarGod1134]

sry eldiablov but i cant really figure out the answer to ur q. But i have a question myself. Im making a maze game and I have a path my dude walks down and enemies patroling the path moving back and forth in the same direction. but im having a problem here. i figured out how to move my enemies back and forth and it involves using a variable and adding to it and they move and its really complicated it worked yes but im wondering if there is a easier way to make a enemy patrol and path. i saw on evilmana they could make an enemy move in a circle but not in a straight line help plz.

[yaustar]

Completely off the hip.

Direction = { x = 0, y = 0 }
Position = { x = 0, y = 0 }

Direction.x = 1
Position.x = 10
Position.y = 10

Speed = 3

while true do
	if Position.x < 10 then
		Direction.x = 1
	end
	
	if Position.x > 200 then
		Direction.x = -1
	end
	
	Position.x = Position.x + ( Speed * Direction.x )
	Position.y = Position.y + ( Speed * Direction.y )

end

Not brilliant but it works.

[GuitarGod1134]

^^^ thats the patrolling code?
EDIT: yah it is lol ok thanks.

[mark.sparky]

Is there a way to display the psp's current time and then use that so that if it is a certain time then the screen will be using a dark map and if it is before the time then it will use the light map

[Anti-QuickJay]

Why would you want to display the current time when you can just press the home button?

[mark.sparky]

because i am making a game and i want it so that when it is say 6 o'clock then a dark map will be displayed but before 6 o'clock a light map will be displayed.

[GuitarGod1134]

I dont know. I think you would need to access the flash though because of the time.

[mark.sparky]

well what about when you use random numbers you use os.time() which is where you use the current tmie to determine random numbers

[emericaska8r]

ok, here is my question, i am making a pong like game, yet there are four sides in play. I need to get my collisions correct so that when the ball bounces off any of the four bars it will change course. Here is my code, what is wrong with it?

function collision()
	collide = "false"
	if ballspot.x == 15 then
		for a = (barl.y), 50 do
			if ballspot.y == a then
				slope.x = slope.x * -1
				collide = "true"
			end
		end
		if collide == "false" then
			gameover()
		end
	end
	if ballspot.x == 465 then
		for a = (barr.y), 50 do
			if ballspot.y == a then
				slope.x = slope.x * -1
				collide = "true"
			end
		end
		if collide == "false" then
			gameover()
		end
	end
	if ballspot.y == 257 then
		for a = (bard.x), 50 do
			if ballspot.x == a then
				slope.y = slope.y * -1
				collide = "true"
			end
		end
		if collide == "false" then
			gameover()
		end
	end
	if ballspot.y == 15 then
		for a = (baru.x), 50 do
			if ballspot.x == a then
				slope.y = slope.y * -1
				collide = "true"
			end
		end
		if collide == "false" then
			gameover()   --you missed the ball
		end
	end
end

here barl is the left bar
barr is right, baru is upper, and bard is the lower bar.
The images for the bars are (10x50) and (50x10)

they are each located 5 pixels from the outer edge.

also, if anyone wants to help me but doesn't understand all that, you can pm me and i will give you my entire code to look at. I trust nobody will steal it because the game is too simple, yet i think will be somewhat fun at the end...
-= Double Post =-
ok nm guys, i worked it out. the problem was that when I had the for loop run, it would go from the bar's x value to 50, when i wanted it to go from the bar's x value to that number + 50.

i also fixed some other minor things to make the highscore work and so-on. Now the game will completely work :Jump:

[GuitarGod1134]

is this patrolling code valid? im basing it off head 54us's idea. But im not sure if it will work but it looks valid to me

if enemy[1].x > 20 then
enemy[1].y = enemy[1].y + 3
if enemy[1].x > 25 then
enemy[1].y = enemy[1].y + 3
if enemy[1].x > 29 then
enemy[1].y = enemy[1].y + 3
if enemy[1].x == 30 then
enemy[1].y = enemy[1].y + 3
if enemy[1].x < 40 then
enemy[1].y = enemy[1].y + 3
if enemy[1].x > 12 then
enemy[1].y = enemy[1].y + 3
if enemy[1].x == 30 then
enemy[1].y = enemy[1].y + 3
if enemy[1].x < 40 then
enemy[1].y = enemy[1].y + 3
if enemy[1].x > 12 then
enemy[1].y = enemy[1].y + 3
if enemy[1].x < 40 then
enemy[1].y = enemy[1].y + 3
if enemy[1].x > 12 then
enemy[1].y = enemy[1].y + 3
if enemy[1].x < 40 then
enemy[1].y = enemy[1].y + 3
if enemy[1].x > 12 then
enemy[1].y = enemy[1].y + 3
end

also to make my enemy move backwords i use exactly the same code but subtract from the y coordinate instead. do u guys think this will work?
EDIT: wow ok i lost track of myself. what are the x and y coordinates on the psp i know what they are but are they like backwords on the psp or something because on a real graph 0,0 is on the bottom left but on the psp 0,0 is on the top left corner. is x the width and y the height ? someone help im confused

[Yongobongo]

I dont know. I think you would need to access the flash though because of the time.

Na, you use os:time()

[emericaska8r]

On the PSP, x is width and y is height. I have no experience in patrolling or whatever, so i can't answer your other question.

[Glynnder]

its not just on the PSP, thats the same on a graph (co-ords) & in matrices its the same, but you use 2 x 4 or whatever (however it means x x y)

[AZeyC]

I am trying to make a five DIGIT password application that you can boot on startup:

http://forums.qj.net/f-psp-developme...ion-77884.html

I have finished the main part of the code which was edited from an example program:

http://evilmana.com/tutorials/codeba...rd_program.php

Spoiler for the edited code:

System.usbDiskModeActivat e()

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

p1file = io.open("p1.txt", "r")
p1f = p1file:read("*n")
p1file:close()

p2file = io.open("p2.txt", "r")
p2f = p2file:read("*n")
p2file:close()

p3file = io.open("p3.txt", "r")
p3f = p3file:read("*n")
p3file:close()

p4file = io.open("p4.txt", "r")
p4f = p4file:read("*n")
p4file:close()

p5file = io.open("p5.txt", "r")
p5f = p5file:read("*n")
p5file:close()

screen:clear(black)

p1 = 1
p2 = 2
p3 = 3
p4 = 4
p5 = 5
current = 1

function Something()
while true do
os.exit()
end
end

oldpad = Controls.read()
while true do
pad = Controls.read()
screenrint(164, 89, "Enter your password", white)
screenrint(194, 109, "p1", white)
screenrint(214, 109, "p2", white)
screenrint(234, 109, "p3", white)
screenrint(254, 109, "p4", white)
screenrint(274, 109, "p5", white)
if current == 1 then
screenrint(194, 109, "p1", blue)
end
if current == 2 then
screenrint(214, 109, "p2", blue)
end
if current == 3 then
screenrint(234, 109, "p3", blue)
end
if current == 4 then
screenrint(254, 109, "p4", blue)
end
if current == 5 then
screenrint(274, 109, "p5", blue)
end

if pad:right() and oldpad:right() ~= pad:right() and current < 5 then
current = current + 1
end
if pad:left() and oldpad:left() ~= pad:left() and current > 1 then
current = current - 1
end
if pad:up() and oldpad:up() ~= pad:up() and current == 1 and p1 < 9 then
p1 = p1 + 1
end
if pad:up() and oldpad:up() ~= pad:up() and current == 2 and p2 < 9 then
p2 = p2 + 1
end
if pad:up() and oldpad:up() ~= pad:up() and current == 3 and p3 < 9 then
p3 = p3 + 1
end
if pad:up() and oldpad:up() ~= pad:up() and current == 4 and p4 < 9 then
p4 = p4 + 1
end
if pad:up() and oldpad:up() ~= pad:up() and current == 5 and p5 < 9 then
p5 = p5 + 1
end
if pad:down() and oldpad:down() ~= pad:down() and current == 1 and p1 > 0 then
p1 = p1 - 1
end
if pad:down() and oldpad:down() ~= pad:down() and current == 2 and p2 > 0 then
p2 = p2 - 1
end
if pad:down() and oldpad:down() ~= pad:down() and current == 3 and p3 > 0 then
p3 = p3 - 1
end
if pad:down() and oldpad:down() ~= pad:down() and current == 4 and p4 > 0 then
p4 = p4 - 1
end
if pad:down() and oldpad:down() ~= pad:down() and current == 5 and p5 > 0 then
p5 = p5 - 1
end
if "p1" == "p1f" and "p2" == "p2f" and "p3" == "p3f" and "p4" == "p4f" and "p5" == "p5f" then
Something()
end
screen.waitVblankStart()
screen.flip()
oldpad = pad
end

This attempts to read the numbers from five text files. These numbers are then put into a variable, which is then referenced when the password is input. When the password is input correctly the application exits to the XMB.

At the moment, the app loadsup fine and displays the input screen:

Enter your password
p1 p2 p3 p4 p5

You can scroll over each "part" (p1, p2, p3, p4, p5) but when you attempt to change the digit by using up or down on the d-pad, the "part" stays the same, not allowing the exit unless you use HOME; which brings me onto another question. What is the code snippet which disables the use of the HOME button, so no exit from this app is allowed unless you input the password.