Lua Programming Help Thread

[SG57]

ummm... still dont get it but i see you do need some if statements to trigger moving1-4 to be true or not... Not if pad:left() and moving3==true.... youd need if pad:left() then moving3=true...then go and say if moving3==true then screen:blit and junk... much easier and understandable...and since i cnat see your whole code.. i dunno whats going on lol

[natan333]

ok, tomorrow i put the whole code in a zip, now i m going to bed

[Tiboric]

This is a copy and paste from the "rotate" example in the new Luaplayer. (which is version 0.19)

I'm learning this myself so I cant explain it to you, but I thought it'd be helpful to you (and others learning the same thing) if I posted it.

function rotate(image)
	local w = image:width()
	local h = image:height()
	local result = Image.createEmpty(h, w)
	for x=0,w-1 do
		for y=0,h-1 do
			result:pixel(h-y-1, x, image:pixel(x, y))
		end
	end
	return result
end

function printRotated(x, y, text, color, image, rotateIndex)
	rotateIndex = math.mod(rotateIndex, 4)
	local w = string.len(text)
	local result = Image.createEmpty(w * 8, 8)
	result:print(0, 0, text, color)
	if rotateIndex > 0 then
		rotateIndex = rotateIndex - 1
		for i=0,rotateIndex do
			result = rotate(result)
		end
	end
	image:blit(x, y, result)
end

cadetBlue = Color.new(95, 158, 160)

printRotated(132, 0, "Don't ask what Lua Player", cadetBlue, screen, 0)
printRotated(472, 76, "can do for you,", cadetBlue, screen, 1)
printRotated(160, 264, "ask what you can do", cadetBlue, screen, 2)
printRotated(0, 76, "for Lua Player!", cadetBlue, screen, 3)
screen.flip()
while true do
	screen.waitVblankStart()
end

Cheers JonFrost, i think i understand it. thats the last piece in my code i'll need, i'll have a beta soon. btw this Thead is great, about 3 weeks ago i was stuck in a rutt with my learning of lua, so i started to read this, i've only got to page 70. but i'll carry on reading once i finish this dam simple game.

hoping some people will give it a try before i release and give me some comments/advice.

Tiboric

[montrob]

Cheers JonFrost, i think i understand it. thats the last piece in my code i'll need, i'll have a beta soon. btw this Thead is great, about 3 weeks ago i was stuck in a rutt with my learning of lua, so i started to read this, i've only got to page 70. but i'll carry on reading once i finish this dam simple game.

hoping some people will give it a try before i release and give me some comments/advice.

Tiboric

I wouldn't use that rotating code.. I used it and it made my game lag like crazy.

[Tiboric]

I wouldn't use that rotating code.. I used it and it made my game lag like crazy.

got any sugestions then?

but lag doesn't really matter that much in my game.

thanks for the heads up though

[montrob]

I got no suggestions.. I just had to leave the text unrotated.. and well, if lag doesnt matter then use it.

[Altair]

Why dont you just use a prerotated image? Or is the text different each time?

[natan333]

Here is the whole code that the moving picture only stop working for only 1 blocking picture and not the others.

search for Buggykiller and above that is the code to make the moving picture stopworking when it tryes to go inside block

[natan333]

so anyone knows whats the problem ?

~edit . ah never mind, one of the codes in buggy that was making only 1 block work

[montrob]

Why dont you just use a prerotated image? Or is the text different each time?

well its printing the score that you have for the game.. so ya its different every time

[Tiboric]

Why dont you just use a prerotated image? Or is the text different each time?

its two countdown timers!

so i could use pics, but its not something i favour.

i've got some work to do on my bonus features.
but its something im considering.

[Altair]

One thing you could do is, you have all the numbers saved as a seperate image. Then you blit the right one at the right places. Hope thats clear enough.

[Tiboric]

One thing you could do is, you have all the numbers saved as a seperate image. Then you blit the right one at the right places. Hope thats clear enough.

yeah thats what I was just talking about. :)

[Altair]

yeah i see now, sorry. I read montrobs reaction after yours and he doesn't use this, i think. I should have added "@Montrob" before my post.

[Tiboric]

LOL, no worries,
thanks for the help, i'll be needing lots more later on Im sure. :)

[natan333]

guys i m stuck in something

look at the picture

I made the square boxes to make the player picture moves to be false if it tries to get through the boxes and i made player moves to be true if its at the left side and bellow of the boxs.

if moving1 == false and x0 <= block[c].x-14 and x0 >= block[c].x-16 and y0 >= block[c].y+16 then
moving1 = true
end

The code above will make player picture to go up if its bellow the box and to the left side of the boxes as its showing at the picture above.

At the picture above, player picture moves is true becuase its left side and bellow the box.

The problem is:
If there is another box at the left side of the 3 boxes so its above the player picture, player picture will try to get through the box but it stops when it pass 1-2 pixels.

my question is? Is there a code that i can add in the code above to make the moving1 = true if it reads the color of the background to the left side of any box ?
so if it dosent match the background color to the left side of a box, the player1 will not move up


~Edit like this code bellow for an example, i added "white == screenixel(block[c].x-14, block[c].y)" but it dosent work

if moving1 == false and x0 <= block[c].x-14 and x0 >= block[c].x-16 and y0 >= block[c].y+16 and white == screen:pixel(block[c].x-14, block[c].y) then
moving1 = true
end

[EminentJonFrost]

The problem is:
If there is another box at the left side of the 3 boxes so its above the player picture, player picture will try to get through the box but it stops when it pass 1-2 pixels.

my question is? Is there a code that i can add in the code above to make the moving1 = true if it reads the color of the background to the left side of any box ?
so if it dosent match the background color to the left side of a box, the player1 will not move up


~Edit like this code bellow for an example, i added "white == screenixel(block[c].x-14, block[c].y)" but it dosent work

if moving1 == false and x0 <= block[c].x-14 and x0 >= block[c].x-16 and y0 >= block[c].y+16 and white == screen:pixel(block[c].x-14, block[c].y) then
moving1 = true
end

Could it be this part:

x0 <= block[c].x-14 and x0 >= block[c].x-16

Are you sure you meant for "x0" to be specifically in between those two #s?
That means "x0" can only equal one number at all for "moving1" to be true.

[natan333]

Could it be this part:

x0 <= block[c].x-14 and x0 >= block[c].x-16

Are you sure you meant for "x0" to be specifically in between those two #s?
That means "x0" can only equal one number at all for "moving1" to be true.

if it dosent have "y0 >= block[c].y+16" picture player that have x0 and y0 axis will bypass any box and not bypass the corners bellow. and if it dosent have "x0 <= block[c].x-14 and x0 >= block[c].x-16 " it will just go through the box.
the code i put works great but my question is what code i put to read the white background color to the left side so the white background will also be needed to make moving up true

[EminentJonFrost]

if it dosent have "y0 >= block[c].y+16" picture player that have x0 and y0 axis will bypass any box and bot bypass the corners bellow. and if it dosent have "x0 <= block[c].x-14 and x0 >= block[c].x-16 " it will just go through the box

no no, look, I'm saying you limited that "moving1" to be true ONLY if

"x0" is 14 < x > 16

see?
the chances are very narrow.
at least I'm guessing, i dont what "x0" would equal otherwise.
as for the "y0", I said nothing of it.

[PSPduh]

if it dosent have "y0 >= block[c].y+16" picture player that have x0 and y0 axis will bypass any box and not bypass the corners bellow. and if it dosent have "x0 <= block[c].x-14 and x0 >= block[c].x-16 " it will just go through the box.
the code i put works great but my question is what code i put to read the white background color to the left side so it becames true

If you are saying you want moving1 to be true if the background is white, then can't you do:

if screen:blit(480,272,white) == true then
moving1 = true
end

I think that is what you meant, but I kept getting more as I kept re-reading it.

[natan333]

no no, look, I'm saying you limited that "moving1" to be true ONLY if

"x0" is 14 < x > 16

see?
the chances are very narrow.
at least I'm guessing, i dont what "x0" would equal otherwise.
as for the "y0", I said nothing of it.

from what it shows in my psp, the "x0" is 14 < x > 16 is telling to be true outside of the box to the left and right but it makes bug if there is more then 2 boxes close together so y0 >= block[c].y+16 makes to be left only to be true

[natan333]

If you are saying you want moving1 to be true if the background is white, then can't you do:

if screen:blit(480,272,white) == true then
moving1 = true
end

I think that is what you meant, but I kept getting more as I kept re-reading it.

like that is for the whole background. i want to make like a 16x , 16y invisible square to the left of all box so if its white in that invisible square, it becomes true for moving1 and if there is another color, it dosent do nothing

[emericaska8r]

does anyone know why my scripts keep getting an error because 'there is no loop to break'? The thing I have (by help of Jon Frost) is that at the beginning of a function it says :
if quit == true then
break
end
What is wrong with it, and why can't it break the function loop?
Also, I just took that part out of my code, saved and retried the program, yet it had the same error? I am so confused.

[SG57]

Think my friend...... think... break = break a loop = has to be in a loop... Not neccessarly a function...

Basically, just put the 'if' statment for breaking the loop in the/a loop

[natan333]

hmm

how can i make the opposite of

if moving1 == false and x0 >= block[c].x+16 and y0 >= block[c].y+16 then
moving1 = true
end

[EminentJonFrost]

hmm

how can i make the opposite of

if moving1 == false and x0 >= block[c].x+16 and y0 >= block[c].y+16 then
moving1 = true
end

The opposite of that?
(This is assuming you want "moving1" to be false again.)

if moving1 ~= false and x0 >= block[c].x+16 and y0 >= block[c].y+16 then
moving1 = false
end

That what you mean?

does anyone know why my scripts keep getting an error because 'there is no loop to break'? The thing I have (by help of Jon Frost) is that at the beginning of a function it says :
if quit == true then
break
end
What is wrong with it, and why can't it break the function loop?
Also, I just took that part out of my code, saved and retried the program, yet it had the same error? I am so confused.

I'll take another look at it.

EDIT - emericaska8r, check your PM or email.

[Glynnder]

i think that that is what he means...

[EminentJonFrost]

i think that that is what he means...

I think so too, but I've been wrong before.

[natan333]

if moving1 == false and x0 >= block[c].x+16 and y0 >= block[c].y+16 then
moving1 = true
end

This code makes the player moving1 (up) to be true if its at the right side of the block and bellow it

i want to change the right to left.

[EminentJonFrost]

if moving1 == false and x0 >= block[c].x+16 and y0 >= block[c].y+16 then
moving1 = true
end

This code makes the player moving1 (up) to be true if its at the right side of the block and bellow it

i want to change the right to left.

How is it stuck if the player it isnt touching and is not going to touch a block?
I'm gonna go back read over everything again. This is confusing me. Plus, the way you explain it (no offense) is not helping.

EDIT - OOOOOOHHHHH!! Ok. I get it now.

All right, you want it luaplayer to check if theres a block in the way of the player, and if there is, the player cannot go through it. Makes sense. It was harder to understand that since some parts of your post were repetitive.

Ok, umm...all right, heres an example:

-- box is 20x20 pixels
box_x = 100
box_y = 100
box2_x = 120
box2_y = 120

--[[this means the box will cover from:

 (100, 100)____________(120, 100)
|
|
|
|
|
(100, 120)_____________(120, 120) <bottom right of pic

]]

if player_x > box2_x or player_x < box_x and player_y > box2_y or player_y < box_y then 
can_move = true
end

if player_x >= box_x and player_x <= box2_x then
can_move = false
end

if player_y >= box_y and player_y <= box2_y then
can_move = false
end

does that help you?