Lua Programming Help Thread

[Grimfate126]

LOL, today seems to be "hate animlib day" heh.

BAN ON ANIMLIB!! (JK!!)

[moncristo_da_dev]

i actually like it because i can do an animation in two lines which kicks a$$

[Urameshi]

actually i dont like animLib on like walking animations, but on other animation animLib saves the day

[romulator]

Which string function counts how many times a letter occurs in that string (if such a function exists). For example: string.getnum(mystring,"\ n") would count how many newlines in a string.

[youresam]

You gotta write it yourself.

[seenit]

in c/c++ there is a command in the string.h library(don't remeber it off hand)

[Urameshi]

but this is lua

[Grimfate126]

almost done...

[romulator]

Any idea on how I could do this youresam? You've probably done something like this before I suppose?
EDIT: Nevermind, I know how.

[youresam]

bleh?
total = 0
for a=1,string.len(str) do
if string.sub(str,a,a) == char then total = total + 1 end
end

[romulator]

bleh?
total = 0
for a=1,string.len(str) do
if string.sub(str,a,a) == char then total = total + 1 end
end

Mine was:
lastenter = string.find(currenttext," \n",0)
numenter = 0
function NumEnters( )
lastenter = string.find(currenttext," \n",lastenter)
if lastenter ~= nil then
numenter = numenter + 1
end
end

[Grimfate126]

dofile("animLib.lua")

standright = SS.new("jackstandright", "png", 24, 50, "images/jack/")
standleft = SS.new("jackstandleft", "png", 24, 50, "images/jack/")
runright = SS.new("jackrunright", "png", 64, 48, "images/jack/")
runleft = SS.new("jackrunleft", "png", 64, 48, "images/jack/")

pad = Controls.read()

player = {}
player.x = 20
player.y = 210
player.state = "standRight" -- ditch the img, use states --

-- NOTE: oldpad isnt necessary. --

while true do

screen:clear()

-- NOW, the part you're having trouble with --

if pad:right() then -- if RIGHT is pressed --
	player.state = "runRight"
	player.x = player.x + 7
elseif pad:left() then -- if LEFT is pressed --
	player.state = "runLeft"
	player.x = player.x - 7
else -- meaning NEITHER IS PRESSED --
	if  player.state == "runRight" then -- if he was running right before --
		player.state = "standRight" -- then he is standing right --
	elseif player.state == "runLeft" then -- same as above --
		player.state = "standLeft"
	end
end

-- draw animation --
if player.state == "runRight" then
     runright:blit(player.x, player.y, 50)
elseif player.state == "standRight" then
     standright:blit(player.x, player.y, 50)
elseif player.state == "runLeft" then
     runleft:blit(player.x, player.y, 50)
elseif player.state == "standLeft" then
     standleft:blit(player.x, player.y, 50)
end

screen.waitVblankStart()
screen.flip()
end

[romulator]

I haven't checked it but should work (I hope).

[youresam]

Mine was:
lastenter = string.find(currenttext," \n",0)
numenter = 0
function NumEnters( )
lastenter = string.find(currenttext," \n",lastenter)
if lastenter ~= nil then
numenter = numenter + 1
end
end

That would be the proper way to do it. Except you forgot to loop it
-= Double Post =-
Grim you know you could replace the states with the images, would make it a lot easier to blit.

[emericaska8r]

Grim you know you could replace the states with the images, would make it a lot easier to blit.

yea, why did you switch to states? You said it was easier in that code but i don't see how.

[romulator]

Oh yeah woops. Well its good to know I was on the right track.

[emericaska8r]

if pad:buttons() > 0 then

lol, i just made a script of:

while true do
	screen:clear()
	pad = Controls.read()
	screen:print(100,100,pad:buttons(),Color.new(255,255,255))
	screen.flip()
	screen.waitVblankStart()
end

and it turns out pressing cross == 16384

[Grimfate126]

yea, why did you switch to states? You said it was easier in that code but i don't see how.

im simply thinking for a long term solution. suppose you had a player image (which is treated like a state) and you didnt have an animation for it. (believe me, it does happen. such as: player.img = dead) if you did that, you would need an animation for every single state. on the other hand, using states seperately gives you the freedom to not have to use animations for everything. sure, the blitting is a bit tedious, but its ultimately the better choice.

[youresam]

lol, i just made a script of:

while true do
	screen:clear()
	pad = Controls.read()
	screen:print(100,100,pad:buttons(),Color.new(255,255,255))
	screen.flip()
	screen.waitVblankStart()
end

and it turns out pressing cross == 16384

Wait a minute, Controls:buttons() returns the C variable of the pad?
I shoulda guessed that, since there is no "total buttons" variable. So yeah, I guess you can use bitmasks in lua for buttons

[xpack]

Does anybody know where to get an lrx or something w/ zip compress and uncompress abilities

[youresam]

someone wrote a lib in lua that does it btw

[moncristo_da_dev]

my god, animlib is getting complicated with my demands

[Urameshi]

how come this doesnt work:

if collision(Player,Enemy) then
screen.waitVblankStart(300)
screen:blit(0,0,next)
level2()
end

when Player collides with Enemy i want it to wait 5 seconds and blit the image next then go to level2() but it just pauses then goes to level2 without blitting the image:Argh: :Argh:

[Merick]

Oh god, that's so easy.

Just take a look at your code again and really think about what you've written, if you still can't figure it out...

[myschoo]

if collision(Player,Enemy) then
screen:blit(0,0,next)
screen.flip()
screen.waitVblankStart(30 0)
level2()
end

[Urameshi]

if collision(Player,Enemy) then
screen:blit(0,0,next)
screen.flip()
screen.waitVblankStart(30 0)
level2()
end

thanks dude, i dont know why, but when i tried that earlier it didnt work

[moncristo_da_dev]

r u done grim?

[Grimfate126]

r u done grim?

i posted it yesterday... here:

dofile("animLib.lua")

standright = SS.new("jackstandright", "png", 24, 50, "images/jack/")
standleft = SS.new("jackstandleft", "png", 24, 50, "images/jack/")
runright = SS.new("jackrunright", "png", 64, 48, "images/jack/")
runleft = SS.new("jackrunleft", "png", 64, 48, "images/jack/")

pad = Controls.read()

player = {}
player.x = 20
player.y = 210
player.state = "standRight" -- ditch the img, use states --

-- NOTE: oldpad isnt necessary. --

while true do

screen:clear()

-- NOW, the part you're having trouble with --

if pad:right() then -- if RIGHT is pressed --
	player.state = "runRight"
	player.x = player.x + 7
elseif pad:left() then -- if LEFT is pressed --
	player.state = "runLeft"
	player.x = player.x - 7
else -- meaning NEITHER IS PRESSED --
	if  player.state == "runRight" then -- if he was running right before --
		player.state = "standRight" -- then he is standing right --
	elseif player.state == "runLeft" then -- same as above --
		player.state = "standLeft"
	end
end

-- draw animation --
if player.state == "runRight" then
     runright:blit(player.x, player.y, 50)
elseif player.state == "standRight" then
     standright:blit(player.x, player.y, 50)
elseif player.state == "runLeft" then
     runleft:blit(player.x, player.y, 50)
elseif player.state == "standLeft" then
     standleft:blit(player.x, player.y, 50)
end

screen.waitVblankStart()
screen.flip()
end

[moncristo_da_dev]

now it doesn't move but i get the idea thanks

[emericaska8r]

Wait a minute, Controls:buttons() returns the C variable of the pad?
I shoulda guessed that, since there is no "total buttons" variable. So yeah, I guess you can use bitmasks in lua for buttons

whats a bitmask?