Lua Programming Help Thread

[HaxxBlaster]

im just making a simple jump function

Ok, please say what the aim of your code is next time.
Here is a jump tutorial: http://www.evilmana.com/tutorials/lu...et_jumping.php

[moncristo_da_dev]

ya, but that one sucks, mine is simple and to the point

[myschoo]

i have a text file like this:

code1 = 0
code2 = 0
code3 = 0
code4 = 0
code5 = 0

and now i need with file io save new value to code3, how would i do that??

anyone??

[yaustar]

ya, but that one sucks, mine is simple and to the point

Problem. Goes up, doesn't come back down. Also, it is prone to double/triple/etc jumping.

[emericaska8r]

ya, but that one sucks, mine is simple and to the point

no, yours is unnecissary and flawed

[xpack]

i have a text file like this:

code1 = 0
code2 = 0
code3 = 0
code4 = 0
code5 = 0

and now i need with file io save new value to code3, how would i do that??

check this out here and see if it help would, write up the code but kind of busy

http://evilmana.com/tutorials/lua_tutorial_09.php

[Urameshi]

how come this doesnt work?

if collision(Player,Stick) then
menu1()
end

[KleptoOne]

how come this doesnt work?

if collision(Player,Stick) then
menu1()
end

as long as your collision function returns either true or false and menu1() is a valid function then it should. Have to see those 2 functions for better insight.

[Urameshi]

nvm i fixed it, but i still dont know why it wouldnt load the menu tho

[xpack]

It may be becuase you have menu1 as a function try changing it to
menu1 = Image.load("whatever")

or make sure you have something like

function menu1()
-- your code here
end

[Urameshi]

the code was right, but i dont know why that didnt work, but i found another way to start the script over

[moncristo_da_dev]

no, yours is unnecissary and flawed

ya, well if the jumping codes were actually interpretable, then i would use them in my code.

[yaustar]

ya, well if the jumping codes were actually interpretable, then i would use them in my code.

Done: http://forums.qj.net/f-psp-developme...ack-79712.html

Look at the last one in the list of four.

[eldiablov]

hi guys. Im back and think i have stumbled pon some very good advice. Would this work if i managed to incorporate it into my code


From El Xando :

What you need to do is tan-1 times (b/a). So a is how far he's gone along and b is how far he's gone up. you divide how far he's gone up by how far hes gone along, then times it by tan-1. So either tan-1 x (b/a) or b/a x tan-1, the second one is probably easiest because it doesnt use brackets, and if you are online now please come on MSN.

[LMelior]

From El Xando :

What you need to do is tan-1 times (b/a). So a is how far he's gone along and b is how far he's gone up. you divide how far he's gone up by how far hes gone along, then times it by tan-1. So either tan-1 x (b/a) or b/a x tan-1, the second one is probably easiest because it doesnt use brackets, and if you are online now please come on MSN.

Uh, this doesn't make sense at all. If I had to guess, I'd say it looks like he's trying to explain calculating the angle at which something is moving, but he doesn't understand it himself. Here's a simple explanation (scroll down to the second box):

http://hyperphysics.phy-astr.gsu.edu/hbase/ttrig.html

[Mr305]

Who actually ported LUA to Psp and When?

[youresam]

Who actually ported LUA to Psp and When?

Shine, 2005.

[eldiablov]

Uh, this doesn't make sense at all. If I had to guess, I'd say it looks like he's trying to explain calculating the angle at which something is moving, but he doesn't understand it himself. Here's a simple explanation (scroll down to the second box):

http://hyperphysics.phy-astr.gsu.edu/hbase/ttrig.html

our definitions of simple are quite different :)

[xpack]

Uh, this doesn't make sense at all. If I had to guess, I'd say it looks like he's trying to explain calculating the angle at which something is moving, but he doesn't understand it himself. Here's a simple explanation (scroll down to the second box):

http://hyperphysics.phy-astr.gsu.edu/hbase/ttrig.html

That's simple :Cry:

[ahrimanes]

hiii therreeee here i got some questions about gu gum... im having problems when tray to draw a 3d model... some faces that must be in bottom draw over the faces that must be in front, i have tested changing the place of the faces in the matrix but still having that problem,,, so that makes me think that my error is in the way i setup the:

Gum.matrixMode() can some body give an explanation of the parameters it got, how, when
to use and what they do
or mybe on the :

Gum.drawArray(Gu.TRIANGLE S, Gu.TEXTURE_32BITF+Gu.COLO R_8888+Gu.VERTEX_32BITF+G u.TRANSFORM_3D, yourtable)

im folowing the 3d basic tutorial from tactical penguin and got not problems drawingplanes and texturing them, but whit a more complex model.

.... sorry about my english, im from mexico.. and still ned some practice. lol... hope here not racist people. hehehe :P tnxs...

[KleptoOne]

Maybe your drawing your tri's incorrectly. Any facing you should have their coordinates plotted clockwise, and those facing opposite should be drawn counter-clockwise.

[ahrimanes]

Maybe your drawing your tri's incorrectly. Any facing you should have their coordinates plotted clockwise, and those facing opposite should be drawn counter-clockwise.

could you explain alitle more... i dont get it..:Cry:

i think my triangles are in good order cos i have no back facing,,, i just have some triangles drawing on top when they must be on bottom.... whyyyyyy ??? mybe i shoul post an screen shot.... i will do when be in home..

[LMelior]

our definitions of simple are quite different :)

That's simple :Cry:

Well it was the simplest one that I could find in my one minute of searching. I could have sent you to the Wolfram MathWorld page for inverse tangent instead, but I'm not that sadistic. Like I said, just look at the picture and the equation in the second box of that first page I linked to, don't even worry about the text.

Using the same variable names as that explanation, the function you're looking for is math.atan(b/a). If you'd like, though, the text describes the problems with using that function, which is the reason we also have math.atan2(b,a) - notice the number of arguments. Of course, all of this is assuming that you actually want the angle of something, which I haven't seen proof that you actually do in the first place.

[emericaska8r]

i understood it, it refreshed my memory on trigs

[Bob Hoil]

Hey guys i am making a game in lua to help me learn. I was wondereing if i could use a table for enmies then have a number of enemies then when they all are died it will go to the next level. I know you can make the table but i am not sure how to make it check how many enemies are left.

Sorry if this is a stupid question.

Thanks Bob Hoil

[Merick]

use a counter in your table, when an enemy dies -1 from the counter

[youresam]

Hey guys i am making a game in lua to help me learn. I was wondereing if i could use a table for enmies then have a number of enemies then when they all are died it will go to the next level. I know you can make the table but i am not sure how to make it check how many enemies are left.

Sorry if this is a stupid question.

Thanks Bob Hoil

Hey Bob,

table.getn(enemies)

Thanks, Sam

[TacticalPenguin]

Lol that's about all you need to figure the rest out. numberofenemies = table.getn(enemies)
if *enemy is killed* then table.remove(enemies,1) end

[Bob Hoil]

Thanks guys and by the way tactical i finally got the shooting to work i didn't use your shooting method though.
-= Double Post =-
One more question. Ok i have a collision code but want to know how to make it destroy and object when it hits it. Right now it just restarts the game.

Thanks Bob Hoil

[SG57]

Bob Hoil -

explosion_frame = 0
explosion = {}

for i=1,NUM_FRAMES_IN_EXPLOSION do
     explosion[i] = Image.load("explosion_frame" .. i .. ".png")
end

-- in infinite loop

if collision(bullet,object) then
     object.dead = true
end

if object.dead == true then
     explosion_frame=explosion_frame+1
     screen:blit(object.x,object.y,explosion[explosion_frame])
     if explosion_frame >= NUM_FRAMES_IN_EXPLOSION then
          explosion_frame = 0
          object.dead = false
          -- your 'restart' code or w/e you said...
     end
end

Thats very very very basic.... Youd have to incorporate a timer to increase the current frame in the explosion so its not every loop it increases, adapt it to your code, etc.