Lua Programming Help Thread

Zitat:

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Zitat von EminentJonFrost

oh...i get it now.
i didnt know that worked with images too...
Does it pretty much work wherever qoutation marks are used?

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yep, exactly. But also if you want to put multiple vars after eachother.

Code:

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if pad:up() then
screen:blit(x0, y0, up2)
screen:flip()
screen.waitVblankStart(10  )
screen:clear(black)
screen:blit(x0, y0, up1)
screen:flip()
screen.waitVblankStart(10  )
screen:clear(black)
y0 = y0 - 5.1
end

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I posted 1 page bellow but i dont think someone will understand it.

The thing i want to do is:
make picture up1 and up2 to keep changing after like 1 second (nonstop) if i hold up pad and while i m holding up pad, both pictures move up with out messing up other pictures and the moves.

the thing i dint like the "screen.waitVblankStart(1 0)" is that it will also skip some areas when its going up and it effects other pictures that is placed in the screen.
can someone help?

Zitat:

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Zitat von MaSt3r_ShAk3

Okay this is getting on my last nerve.... ive tried a MILLION things and it wont do what i want it to do... i need to have it so when I press triangle it plays it back. But currently i have to hold it. also whenever i playback once it wont work again, ill have to restart the app to make it playback again... oh and it only plays 3 frames not 6

Code:

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System.usbDiskModeActivate()

oldpad = Controls.read()

red = Color.new(255,0,0)
black = Color.new(0,0,0)
white = Color.new(255,255,255)

f = {}
f[1] = Image.load("frame#1.png")
f[2] = Image.load("frame#2.png")
f[3] = Image.load("frame#3.png")
f[4] = Image.load("frame#4.png")
f[5] = Image.load("frame#5.png")
f[6] = Image.load("frame#6.png")

canvas = Image.createEmpty(480, 272)
canvas:clear(white)
 
x0 = 200
y0 = 200
x1 = 100
y1 = 100

frame = 0
speed = 1
counter = 0

function playback()
counter = counter + speed
 if counter == 1 then
  screen:blit(0,0, f[1])
  screen.flip()
  screen.waitVblankStart(5)
 elseif counter == 2 then
  screen:blit(0,0,f[2])
  screen.flip()
  screen.waitVblankStart(5)
 elseif counter == 3 then
  screen:blit(0,0, f[3])
  screen.flip()
  screen.waitVblankStart(5)
 elseif counter == 4 then
  screen:blit(0,0,f[4])
  screen.flip()
  screen.waitVblankStart(5)
 elseif counter == 5 then
  screen:blit(0,0, f[5])
  screen.flip()
  screen.waitVblankStart(5)
 elseif counter == 6 then
  screen:blit(0,0, f[6])
  screen.flip()
  screen.waitVblankStart(5)
 end
end

while true do  --MAIN LOOP

canvas:print(2, 20, "Frame: " .. frame, black)

pad = Controls.read()
dx = pad:analogX()

if math.abs(dx) > 32 then
  x0 = x0 + dx / 64
end

dy = pad:analogY()

if math.abs(dy) > 32 then
  y0 = y0 + dy / 64
end

if pad:cross() then
  canvas:drawLine(x0, y0, x1, y1, black)
end

if pad:r() and oldpad:r() ~= pad:r() then
  frame = frame + 1
  screen:save("frame#" .. frame.. ".png")
  canvas:clear(white)
end

play_back = false

if play_back == true then
playback()
end

if pad:triangle() then
  if play_back == false then
    play_back = true
  elseif play_back == true then
    play_back = false
  end
screen.waitVblankStart(10) -- this is so you wont accidently make it keep switching back between true and false just by holding the button down.
end

if pad:square() then
  canvas:clear(white)
end

if pad:start() then
  break
end
 
  x1 = x0
  y1 = y0
  screen:blit(0, 0, canvas, 0, 0, canvas:width(), canvas:height(), false)
  screen:drawLine(x1 - 5, y1, x1 + 5, y1, red)
  screen:drawLine(x1, y1 - 5, x1, y1 + 5, red)
  screen.waitVblankStart()
  screen.flip()
  oldpad = pad
end

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try that.

Code:

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if pad:up() then
screen:blit(x0, y0, up2)
screen:flip()
screen.waitVblankStart(10  )
screen:clear(up2)
screen:blit(x0, y0, up2)
screen:flip()
screen.waitVblankStart(10  )
screen:clear(up1)
y0 = y0 - 5.1
end

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I saw somewhere in an earlier post that that can make it clear just what is specified.

Zitat:

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Zitat von EminentJonFrost

try that.

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doesnt work... it plays a frame real quick n ya...

Zitat:

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Zitat von MaSt3r_ShAk3

doesnt work... it plays a frame real quick n ya...

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oh yea, make the "play_back = false" outside the "while true do" loop.
sorry about that. :p

it works! but playback only works once :Argh: :Argh: like i can still draw frames etc. but if i hit triangle after it plays back once it wont work! this is the main problem ive been having!

Zitat:

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Zitat von bronxbomber92

if you want to clear one imahe hen use this

if pad:cross() then
screen:clear(--your image--)
end

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Code:

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screen:blit(x0, y0, player1)
screen:blit(300, 100, player2)


if pad:up() then
screen:clear(player2)
end

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the clear gave me a red screen, and dint made the picture away :dry:

sry, then i dont know :(

Zitat:

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Zitat von bronxbomber92

sry, then i dont know :(

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i did something 2 times but forgot instant :icon_mad: :Cry: that false made the picture to dissapear.
when i try to put like
"player1 = false" , it gives me error :dry: