attempt to index global 'bird' (a nil value) message < -- nid help how to set bird to global inside the function

Solar2D Lua Language
#1

[code]
require “CiderDebugger”;local physics = require(“physics”)
local physics = require(“physics”)
physics.start()
display.setStatusBar(display.HiddenStatusBar)

_W = display.contentWidth
_H = display.contentHeight
_CW = display.contentWidth / 2
_CH = display.contentHeight / 2

local sounds = {
[1] = “introMusic.mp3”,
[2] = “gamePlayMusic.mp3”,
[3] = “birdWav.wav”,
[4] = “fireWav.mp3”
}
local sound = {}

for i = 1, 4 do
sound[i] = audio.loadSound(sounds[i])
end

audio.play(sound[1], { loops = -1})

bkg2 = display.newImage(“bkg2.png”, 0, 0)
bkg2.x, bkg2.y = _CW, _CH

local bkg = display.newImage(“bkg.jpg”, 0, 0)
bkg.x, bkg.y = _CW, _CH

local function loadGamePlay()
local bird
randomSpawn = math.random(0, 100)

birdsCollection = {
[1] = “angryBirdRed.png”,
[2] = “angryBirdWhite.png”,
[3] = “angryBirdYellow.png”
}

if randomSpawn <= 30 and randomSpawn >= 0 then
bird = display.newImage(birdsCollection[math.random(1, 3)], 0, 0)
bird.myName = “bird”
bird.x, bird.y = -25, math.random(-25, _CH + 240)
elseif randomSpawn <= 60 and randomSpawn >= 31 then
bird = display.newImage(birdsCollection[math.random(1, 3)], 0, 0)
bird.myName = “bird”
bird.x, bird.y = display.contentWidth + 25, math.random(-25, _CH + 240)
elseif randomSpawn <= 100 and randomSpawn >= 61 then
bird = display.newImage(birdsCollection[math.random(1, 3)], 0, 0)
bird.myName = “bird”
bird.x, bird.y = math.random(0, display.contentWidth), -25
end
physics.addBody(bird, {density = 1})

transition.to(bird, {time = 1500, x = _CW, y = _CH + 240 })
return bird
end
local tempBird = loadGamePlay()

function birdTrans()

timer.performWithDelay(800, loadGamePlay, 0)
end

function throwRock(e)
local rock
if e.phase == “began” then
rock = display.newImage(“rock.png”, 0, 0)
rock.myName = “rock”
rock.x, rock.y = _CW, _CH + 240

transition.to(rock,{
onStart = audio.play(sound[4]),
time = 600,
x = e.x,
y = e.y
})
transition.to(rock, {time = 10, delay = 600, alpha = 0 })
end
return rock
end

function closeIntro()
audio.pause(sound[1])
sound[1] = nil

audio.play(sound[2],{loops = -1})
loadGamePlay()
end

function onIntro(e)

if e.phase == “began” then
transition.to(bkg,{time = 100, alpha = 0, x = bkg.x - _W, onComplete = closeIntro})
birdTrans()
end

return true
end

local function onLocalCollision(self, e)

if e.phase == “began” then
if self.myName == “bird” then
print(“ouch”)
tempBird:removeSelf()
–rock:removeSelf()
bird = nil
rock = nil
end
end
end

bird.collision = onLocalCollision
bird:addEventListener(“collision”, bird)

bkg:addEventListener(“touch”, onIntro)
bkg2:addEventListener(“touch”, throwRock)

[/code] [import]uid: 197599 topic_id: 33407 reply_id: 333407[/import]

#2

can’t seem to use collide event because attempt to index global ‘bird’ (a nil value) message is occuring. =(… noob here [import]uid: 197599 topic_id: 33407 reply_id: 132727[/import]

#3

You’re creating the bird variable inside the loadGamePlay() function – which means it’s not available outside of that function.

When you do return bird at the end of that function you’re not really sending that variable out into the world where it can be used – just the “stuff” that’s inside that variable.

Declare bird outside of that function and then everyone can use it.

Jay
[import]uid: 9440 topic_id: 33407 reply_id: 132731[/import]

#4

can’t seem to use collide event because attempt to index global ‘bird’ (a nil value) message is occuring. =(… noob here [import]uid: 197599 topic_id: 33407 reply_id: 132727[/import]

#5

You’re creating the bird variable inside the loadGamePlay() function – which means it’s not available outside of that function.

When you do return bird at the end of that function you’re not really sending that variable out into the world where it can be used – just the “stuff” that’s inside that variable.

Declare bird outside of that function and then everyone can use it.

Jay
[import]uid: 9440 topic_id: 33407 reply_id: 132731[/import]