Lua Programming Help Thread

ALSO make sure that windows isnt hiding the .txt file...

go to control panel > folder options > look for the thing that says "hide extensions for known file types" then uncheck that....

if you look at your program after you do that it might say index.lua.txt (the .txt was hidden before) then just take off the .txt part and it should work

Hey i have a question. Is it possible to put a function inside a table and call for that function without the screen:print() option?

Well I have two questions.

First, I am trying to make an image go from the top to the bottom of the screen. That's all. I haven't been able to do it though because I haven't found a way yet. I tried

Code:

---

while image[1].y < 272
do image[1].y=image[1].y + 2
end

---

and

Code:

---

if image[1].y < 272
then image[1].y=image[1].y + 2

---

but neither of those really did anything. I tried a bunch of other ways, but they were pretty much duds too.
(image[1] is part of an array where i have x and y coordinates stored, and for this one I have y=10 so that the image starts at 10. That could be part of the problem but I just can't figure it out.)

Second, I cannot figure out for the life of me how to have a dynamically changing score. Everytime I try to get the new score, I have to clear the screen and display it, but I don't want to clear the screen of the other images on there. Could someone show me a way to do this?

Thanks in advance, you guys are great.

I would make a function and do something like


droptimer = 0
x = 10
y = 10

function movedown()

droptimer = droptimer + 1
if droptimer>=100 and droptimer<=200 then
y = y + 2
droptimer = 0
end
end

while true do
screen:clear()

movedown()


then do all the loading of images and stuff...
but it depends on how fast you want it to drop...
if you wanted it to drop really fast you would change the if droptimer>=100 and droptimer<=200 to lower numbers...

OK thanx I will try that.

Also, do you know anything about my second question? I want it to display the new number every time the score changes, but I don't want to clear the whole screen.

Thanx :icon_smil

Zitat:

---

Zitat von PSPHax0r9

OK thanx I will try that.

Also, do you know anything about my second question? I want it to display the new number every time the score changes, but I don't want to clear the whole screen.

Thanx :icon_smil

---

if you blit all the stuff on your screen in the main loop, why not clear the screen as the first command in the main loop and let it blit over again, each loop?, dunno if it will be a slowdown though.

Zitat:

---

Zitat von PSPHax0r9

OK thanx I will try that.

Also, do you know anything about my second question? I want it to display the new number every time the score changes, but I don't want to clear the whole screen.

Thanx :icon_smil

---

score = 0

if *something happens* then
score = score + 10 --or whatever...
end

screen:blit(0, 0, background)
screen:print(10, 10, string.format("Score: ".. score), white)
screen.flip()
screen.waitVblankStart()
end


I only used background as an example but that is the end of the code where you would blit every image..

@PSPHax0r9
Your own code SHOULD work, both. You do refresh the screen every loop?

For the timer, you dont have to clear the screen everytime. Just blitting over the old one should suffice. That is if you blit a background over everything. If you don't have something that blits over the entire screen, then i think you have to clear the screen before you blit/print something new, or you will see a "trail".

@InhumanElmo:
I dont know if you can put a function in a table, but why don't you just try and see for your self? I guess it should be able.

@Glynnder-PSPro
Do the other buttons work?

Also you dont need more then one screen.flip() in the while loop. The first one can go.

Zitat:

---

Zitat von Altair

@PSPHax0r9
Your own code SHOULD work, both. You do refresh the screen every loop?

For the timer, you dont have to clear the screen everytime. Just blitting over the old one should suffice. That is if you blit a background over everything. If you don't have something that blits over the entire screen, then i think you have to clear the screen before you blit/print something new, or you will see a "trail".

---

Well I don't have a background image yet, I was just trying to do this simple minigame, and I wanted to do all the hard stuff like image movement and everything first. Is it OK if I PM you my code so far? It's sort of messy and I was wondering if you could give me some tips on it or edit things to work better. Thank you.