Lua Programming Help Thread

edit:nvm i figure out a diffrent way
-= Double Post =-
ok here you go access all 4 directions:

Code:

---

blue = Color.new(0,0,255)
black = Color.new(0,0,0)
player = Image.createEmpty(15,15) -- i know it's sometin like that
player:clear(blue)

button = "no"
time_held = 0
x = 240
y = 0
oldpad = pad

while true do
screen:fillRect(0,0,480,272,black)
pad = Controls.read()
if pad:left() then
if time_held < 60 then
time_held = time_held + 1
if pad:left() and oldpad:left() ~= pad:left() then
x = x - 1
end
end
if time_held > 59 then
x = x - 1
end
end
if pad:right() then
if time_held < 60 then
time_held = time_held + 1
if pad:right() and oldpad:right() ~= pad:right() then
x = x + 1
end
end
if time_held > 59 then
x = x + 1
end
end
if pad:up() then
if time_held < 60 then
time_held = time_held + 1
if pad:up() and oldpad:up() ~= pad:up() then
y = y - 1
end
end
if time_held > 59 then
y = y - 1
end
end
if pad:down() then
if time_held < 60 then
time_held = time_held + 1
if pad:down() and oldpad:down() ~= pad:down() then
y = y + 1
end
end
if time_held > 59 then
y = y + 1
end
end
if pad:left() and oldpad:left() ~= pad:left() then
time_held = 0
end
if pad:right() and oldpad:right() ~= pad:right() then
time_held = 0
end
if pad:up() and oldpad:up() ~= pad:up() then
time_held = 0
end
if pad:down() and oldpad:down() ~= pad:down() then
time_held = 0
end
screen:blit(x,y,player)
screen.flip()
screen.waitVblankStart()
oldpad = pad
end

---

tested to work

Zitat:

---

Zitat von slicer4ever

edit:nvm i figure out a diffrent way
-= Double Post =-
ok here you go access all 4 directions:

Code:

---

blue = Color.new(0,0,255)
black = Color.new(0,0,0)
player = Image.createEmpty(15,15) -- i know it's sometin like that
player:clear(blue)

button = "no"
time_held = 0
x = 240
y = 0
oldpad = pad

while true do
screen:fillRect(0,0,480,272,black)
pad = Controls.read()
if pad:left() then
if time_held < 60 then
time_held = time_held + 1
if pad:left() and oldpad:left() ~= pad:left() then
x = x - 1
end
end
if time_held > 59 then
x = x - 1
end
end
if pad:right() then
if time_held < 60 then
time_held = time_held + 1
if pad:right() and oldpad:right() ~= pad:right() then
x = x + 1
end
end
if time_held > 59 then
x = x + 1
end
end
if pad:up() then
if time_held < 60 then
time_held = time_held + 1
if pad:up() and oldpad:up() ~= pad:up() then
y = y - 1
end
end
if time_held > 59 then
y = y - 1
end
end
if pad:down() then
if time_held < 60 then
time_held = time_held + 1
if pad:down() and oldpad:down() ~= pad:down() then
y = y + 1
end
end
if time_held > 59 then
y = y + 1
end
end
if pad:left() and oldpad:left() ~= pad:left() then
time_held = 0
end
if pad:right() and oldpad:right() ~= pad:right() then
time_held = 0
end
if pad:up() and oldpad:up() ~= pad:up() then
time_held = 0
end
if pad:down() and oldpad:down() ~= pad:down() then
time_held = 0
end
screen:blit(x,y,player)
screen.flip()
screen.waitVblankStart()
oldpad = pad
end

---

tested to work

---

thats wayy too long/complicated. my way works better (it not exactly accurate, but right like 99 percent of the time.)

the hard/complicated way may be long but usually it ensures less bugs=-)

Zitat:

---

Zitat von slicer4ever

i'm testing the code i wrote i just can't remeber the image.createnew command i know it's sometin like that

edit: @ralan try it and see what happens or post your code is it working like you want or not?

---

Its way to fast... brb while i find my script

ok well when you do be sure to include what you want it to do

ok guys new problem. :(

here is my code: ( i have loaded all the images already)

Code:

---

test = {}
frames = 1

test[frames+1] = Timer.new()
test[frames+2] = 1
test[frames+3] = 1

x = 5
y = 5

screen:blit(x, y, test[test[frames+2]])
test[frames+1]:start()

for test[frames+3] = 1, frames do -- THIS IS THE LINE OF THE ERROR--
if test[frames+1]:time() >= ((test[frames+3] -1) * interval) and test[frames+1]:time() <= (test[frames+3] * interval) then
test[frames+3] = test[frames+2]
end
end

---

the error says: (in windows lua)

Code:

---

ERROR: '=' or 'in' expected near '[''

---

thx for help!

I don't think you can use an array there in the for loop.
Use a temp variable, something like

Code:

---

for x = 1, frames do

---

hey im working on my new game and ive got the animation done but what i want to know is how do i get my game to know when the button is not pressed and what direction the sprite should be facing. And also is there a way to check how long a button has been pressed for

For direction:
if pad:left() then
player.direction= "left"
player.x = player.x - 1
end

For the button, do you mean something like this?(from Snake):

while not Controls.read():start() do

I haven't tested it, but I think that would also work as:
if not Controls.read():start()
--or--
and not Controls.read():start()

and any other command.

... To everyone ...

Please run tests and small example programs, made by you, to learn the basic concept of programming... Once that is understood, the syntax of any language is the real challenge...

So in your case, mark.sparky, there's multiple ways to determine what direction, even with your vague question... As for when a button isnt pressed, Im using the basic concept of the 'not' operator with-in an argument/function returning 1 on pressed, 'not-1' when not pressed... So you do the basic puesdo code for this...

Code:

---

-- I dont know all the syntax of LUA, so w/e the 'not' operator is, use it... Im
-- guessing it's the ~ thing... in C its the !

while true do
    sg57 = Controls.read()
   
    -- Ex:  Pause
    if ~sg57:start() then
            --While not paused, have movement calls here
    else -- if start is pressed
          -- app now paused...
    end
end

---

I dont even know probably 1/2 of the LUA syntax as an average LUA coder does, yet i understand the concept/routines to use in accomplishing what you want... It comes in very handy... Anyway, good luck with your new game mark.sparky!