cannot transition frome game.lua to restart.lua

Getting Started Newbie Questions
#1

my game is supposed to restart once a collision happens with my penguin and the ice,  but once the collision it happens the game just stops and the replay screen is not shown and nothing from the game.lua goes away

if i click where the play button is supposed to be in the restart.lua it’ll start the game but the game just restart and the ice blocks are invisible

this is my code for the game 

–

– main.lua

– 

display.setStatusBar(display.HiddenStatusBar)

local _W = display.contentWidth

local _H = display.contentHeight

local scrollSpeed = 3

local physics = require “physics”

physics.start()

local composer = require( “composer” )

local scene = composer.newScene()

–21 here you declare all your local variables:

local score = 0

–24 here you declare all your local functions:  – whatever your code requires…

local function doSomething()

    score = score + 1

end

local function move(event)

bg2.x = bg2.x - scrollSpeed/2

bg3.x = bg3.x - scrollSpeed/2

bg4.x = bg4.x - scrollSpeed/2

bg5.x = bg5.x - scrollSpeed/2

bg6.x = bg6.x - scrollSpeed/2

bg7.x = bg7.x - scrollSpeed

bg8.x = bg8.x - scrollSpeed

bg9.x = bg9.x - scrollSpeed

bg10.x = bg10.x - scrollSpeed

bg11.x = bg11.x - scrollSpeed

if(-bg2.x + bg2.contentWidth) > 1080 then

bg2:translate(2000,0)

end

if(-bg3.x + bg3.contentWidth) > 1080 then

bg3:translate(2000,0)

end

if(-bg4.x + bg4.contentWidth) > 1080 then

bg4:translate(2000,0)

end

if(-bg5.x + bg5.contentWidth) > 1080 then

bg5:translate(2000,0)

end

if(-bg6.x + bg6.contentWidth) > 1080 then

bg6:translate(2000,0)

end

if(-bg7.x + bg7.contentWidth) > 1080 then

bg7:translate(2000,0)

end

if(-bg8.x + bg8.contentWidth) > 1080 then

bg8:translate(2000,0)

end

if(-bg9.x + bg9.contentWidth) > 1080 then

bg9:translate(2000,0)

end

if(-bg10.x + bg10.contentWidth) > 1080 then

bg10:translate(2000,0)

end

if(-bg11.x + bg11.contentWidth) > 1080 then

bg11:translate(2000,0)

end

end

local function activatePengs(self,event)

self:applyForce(0, -45, self.x, self.y)

end

local function touchScreen(event)

– print(“touch”)

if event.phase == “began” then

peng.enterFrame = activatePengs

Runtime:addEventListener(“enterFrame”, peng)

end

if event.phase == “ended” then

Runtime:removeEventListener(“enterFrame”, peng)

end

end

– local function endGame()

    – composer.gotoScene( “restart”, { time=800, effect=“crossFade” } )

– end

local function onCollision(event)

if event.phase == “began” then

print “collide”

composer.gotoScene( “restart” )

end

end

– now comes four required functions for Composer:

function scene:create( event )

    local sceneGroup = self.view

    – put any thing you need to create here

local bg1 = display.newImageRect(“bg.png”, 800, 1000)

bg1.x = _W*1/2; bg1.y = _H/2;

bg2 = display.newImage(“ice2.png”,140,210)

bg3 = display.newImage(“ice2.png”,540,210)

bg4 = display.newImage(“ice2.png”,940,210)

bg5 = display.newImage(“ice2.png”,1340,210)

bg6 = display.newImage(“ice2.png”,1740,210)

bg7 = display.newImage(“ice1.png”,140,420)

bg8 = display.newImage(“ice1.png”,540,420)

bg9 = display.newImage(“ice1.png”,940,420)

bg10 = display.newImage(“ice1.png”,1340,420)

bg11 = display.newImage(“ice1.png”,1740,420)

peng = display.newImage(“peng.png”, 80, 201)

physics.addBody(peng, “dynamic”, {density=.18, bounce=0.1, friction=.5, radius=55})

icebok = display.newImage(“icebok.png”, 480, 201)

physics.addBody(icebok, “static”, {density=.1, bounce=0.1, friction=.5, radius=1})

icebok.speed = 4

icebok.initY = icebok.y + math.random(0,500)

– icebok.amp = math.random(10,50)

– icebok.angle = math.random(1,720)

icebok1 = display.newImage(“icebok.png”, 680, 301)

physics.addBody(icebok1, “static”, {density=.1, bounce=0.1, friction=.5, radius=1})

icebok1.speed = 4

icebok1.initY = icebok1.y + math.random(0,500)

– icebok1.amp = math.random(10,50)

– icebok1.angle = math.random(1,720)

icebok2 = display.newImage(“icebok.png”, 880, 401)

physics.addBody(icebok2, “static”, {density=.1, bounce=0.1, friction=.5, radius=1})

icebok2.speed = 4

icebok2.initY = icebok2.y + math.random(0,500)

– icebok2.amp = math.random(10,50)

– icebok2.angle = math.random(1,720)

icebok3 = display.newImage(“icebok.png”, 1080, 451)

physics.addBody(icebok3, “static”, {density=.1, bounce=0.1, friction=.5, radius=1})

icebok3.speed = 4

icebok3.initY = icebok3.y + math.random(0,500)

– icebok2.amp = math.random(10,50)

– icebok2.angle = math.random(1,720)

function moveiceboks(self,event)

if self.x < -10 then

self.x = math.random (480,1080)

self.y = math.random(0,500)

self.speed = 4

– self.amp = math.random(10,50)

– self.angle = math.random(1,720)

else

self.x = self.x - self.speed

– self.angle = self.angle + .1

– self.y = self.amp * math.tan(self.angle) + self.initY

– self.y = math.random(0,500)

end

end

    – sceneGroup:insert ( background )

    – the rest of your creations go here

end

function scene:show( event )

     local sceneGroup = self.view

if event.phase == “will” then

         – put code here you want to happen just before the scene comes on the screen

– physics.start()

Runtime:addEventListener(“enterFrame”, move)

Runtime:addEventListener(“touch”, touchScreen)

icebok.enterFrame = moveiceboks

Runtime:addEventListener(“enterFrame”,icebok)

icebok1.enterFrame = moveiceboks

Runtime:addEventListener(“enterFrame”,icebok1)

icebok2.enterFrame = moveiceboks

Runtime:addEventListener(“enterFrame”,icebok2)

icebok3.enterFrame = moveiceboks

Runtime:addEventListener(“enterFrame”,icebok3)

Runtime:addEventListener(“collision”, onCollision)

      else

         – put code here you want to happen after the scene comes on the screen

– physics.start()

– Runtime:addEventListener(“enterFrame”, move)

Runtime:addEventListener(“touch”, touchScreen)

– icebok.enterFrame = moveiceboks

– Runtime:addEventListener(“enterFrame”,icebok)

– icebok1.enterFrame = moveiceboks

– Runtime:addEventListener(“enterFrame”,icebok1)

– icebok2.enterFrame = moveiceboks

– Runtime:addEventListener(“enterFrame”,icebok2)

– icebok3.enterFrame = moveiceboks

– Runtime:addEventListener(“enterFrame”,icebok3)

Runtime:addEventListener(“collision”, onCollision)

    end

end

function scene:hide( event )

    local sceneGroup = self.view

if event.phase == “will” then

         – put code here you want to happen just before the scene leaves the screen

Runtime:removeEventListener(“enterFrame”, move)

Runtime:removeEventListener(“touch”, touchScreen)

– icebok.enterFrame = moveiceboks

Runtime:removeEventListener(“enterFrame”,icebok)

– icebok1.enterFrame = moveiceboks

Runtime:removeEventListener(“enterFrame”,icebok1)

– icebok2.enterFrame = moveiceboks

Runtime:removeEventListener(“enterFrame”,icebok2)

– icebok3.enterFrame = moveiceboks

Runtime:removeEventListener(“enterFrame”,icebok3)

Runtime:removeEventListener(“collision”, onCollision)

else

         – put code here you want to happen after the scene has left the screen

– Runtime:removeEventListener(“enterFrame”, move)

Runtime:removeEventListener(“touch”, touchScreen)

Runtime:removeEventListener(“enterFrame”,icebok)

Runtime:removeEventListener(“enterFrame”,icebok1)

Runtime:removeEventListener(“enterFrame”,icebok2)

Runtime:removeEventListener(“enterFrame”,icebok3)

Runtime:removeEventListener(“collision”, onCollision)

end

end

function scene:destroy( event )

     local sceneGroup = self.view

     – put code here if you have things you need to remove that you created in create scene that does NOT go into the sceneGroup)

end

– these must be the last 5 lines in the file

scene:addEventListener( “create”, scene )

scene:addEventListener( “show”, scene )

scene:addEventListener( “hide”, scene )

scene:addEventListener( “destroy”, scene )

return scene

and the restart 

–

– main.lua

–

display.setStatusBar(display.HiddenStatusBar)

local _W = display.contentWidth

local _H = display.contentHeight

local scrollSpeed = 3

local composer = require( “composer” )

local scene = composer.newScene()

local function gotoGame()

    composer.gotoScene(“game”, { time=800, effect=“crossFade” } )

print “game”

end

– local function gotoHighScores()

    – composer.gotoScene( “highscores” )

– end

function scene:create( event )

    local sceneGroup = self.view

local bg1 = display.newImageRect( sceneGroup,“bg.png”, 800, 1000)

bg1.x = _W*1/2; bg1.y = _H/2;

bg2 = display.newImage( sceneGroup, “ice2.png”,140,210)

bg7 = display.newImage( sceneGroup, “ice1.png”,140,420)

– title = display.newImage( sceneGroup, “title.png”, 160, 90)

local playButton = display.newText( sceneGroup, “Play”, 160, 250, native.systemFont, 40 )

playButton:setFillColor( 0.23, 0.60, 1 )

– local highScoresButton = display.newText( sceneGroup, “High Score”, 160, 350, native.systemFont, 40 )

– highScoresButton:setFillColor( 0.23, 0.60, 1 )

playButton:addEventListener(“tap”, gotoGame)

– highScoresButton:addEventListener(“tap”, gotoHighScores)

composer.removeScene( “game” )   

end

function scene:show( event )

composer.removeScene( “game” )

– local sceneGroup = self.view

– local phase = event.phase

– if ( phase == “will” ) then

– Code here runs when the scene is still off screen (but is about to come on screen)

– elseif ( phase == “did” ) then

– Code here runs when the scene is entirely on screen

– end

end

function scene:hide( event )

end

function scene:destroy( event )

  

end

– these must be the last 5 lines in the file

scene:addEventListener( “create”, scene )

scene:addEventListener( “show”, scene )

scene:addEventListener( “hide”, scene )

scene:addEventListener( “destroy”, scene )

return scene

sorry if i posted this wrong 

#2

You aren’t inserting any of your objects into sceneGroup, therefore they will not be automatically removed by Composer.

#3

May i ask where? I attempted to  put everything in the scene group at the start of each function but that didnt change anything

EDIT: nevermind i got what you meant after staring at the fact that i did it in the restart but not the game, thx for your help youre a lifesaver

EDIT AGAIN: Now I’m getting another problem lol, im getting an error game.lua:74: attempt to call method ‘applyForce’ (a nil value) stack traceback: game.lua:74: in function ‘?’ 

?: in function <?:190>

#4

Self is not passed to enterFrame. You’ll need to specifically reference the object ‘peng’. Be careful, though - if the player touches the screen before peng is created, you’ll get a nil exception, so check it is not nil before accessing it.

I’d also recommend looking into lua scope. You are doing ‘local bg1’ and then everything after that appears to be global. You could run into problems with memory leaks (memory increasing and increasing when moving back and forth between scenes).

#5

well i added self to enter frame but it gives me the error before restarting

#6

No, I mean ‘event’ is the only parameter ever passed to an enterFrame listener. You can’t use self, you must reference the object directly.

#7

well i changed all the selfs to peng and then i changed local function touchScreen(event) to local function touchScreen(peng,event) and now I get an error for the event (game.lua:77:attempt to index local ‘event’ (a nil value) stack traceback: game.lua:77: in function ‘?’   ?:in function <?:190>) 

do i need to change the event.phase to peng.phase in the ‘if event.phase == “began” then’

also i appreciate you taking the time to respond, this is my first game so im probably making rookie mistakes :stuck_out_tongue:

#8

You cannot pass anything but event to touchScreen because it is an enterFrame listener.

Because you made ‘peng’ a global variable (bad practise but we’ll gloss over that for now), you can just reference ‘peng’ in touchScreen. This is assuming ‘touchScreen’ is always fired AFTER peng has been created.

I think the problem is you haven’t worked through the basic tutorials and samples (and understood them…) to get a handle on the API, so these mistakes are inevitable.

#9

i attempted to reference peng in function but i just get the same error for peng that i got for event

local function activatePengs(peng,event)

   peng:applyForce(0, -45, peng.x, peng.y)

end

local function touchScreen(event)

    peng = event.target

– print(“touch”)

    if event.phase == “began” then

        peng.enterFrame = activatePengs

        Runtime:addEventListener(“enterFrame”, peng)

    end

    if event.phase == “ended” then

        Runtime:removeEventListener(“enterFrame”, peng)

    end

end

#10

Change this:

[lua]

local function activatePengs (event)

[/lua]

You were still trying to pass peng to the listener. The first (only) parameter on an enterFrame listener is always event. If you call it peng, then now peng isn’t your object anymore within that function, peng is event and doesn’t have a function called applyForce.

Try this example:

[lua]
local dogfood = “Winalot”
local catfood = “Whiskers”

local buyCatfood = function (catfood)

print ("In function: "…catfood)
end

buyCatfood(dogfood)
print ("Outside function: "…catfood)

[/lua]

The above example shows you passing dogfood to the catfood function. Even if you call the parameter catfood in the function, it will still actually be acting on dogfood. You could call it geoff, it will still be dogfood.

Outside of the function, catfood will refer to catfood again.

This is the same as calling event ‘peng’ in the listener parameter list.

#11

You also need to remove peng = event.target from touchScreen.

Doing this overwrites peng with event.target.

#12

And the biggest piece of advice is still to slow down and work through tutorials. The error messages are there for a reason, they tell you exactly went wrong and where, but you need to know what is right before that makes any sense…

#13

the confusing part is when i go from start.lua to game.lua, everything is fine but going from restart.lua to game.lua is what causes the error

and if i click play fast enough after the collision happens it works aagain

is it possible there’s a problem in my restart.lua?

#14

You aren’t inserting any of your objects into sceneGroup, therefore they will not be automatically removed by Composer.

#15

May i ask where? I attempted to  put everything in the scene group at the start of each function but that didnt change anything

EDIT: nevermind i got what you meant after staring at the fact that i did it in the restart but not the game, thx for your help youre a lifesaver

EDIT AGAIN: Now I’m getting another problem lol, im getting an error game.lua:74: attempt to call method ‘applyForce’ (a nil value) stack traceback: game.lua:74: in function ‘?’ 

?: in function <?:190>

#16

Self is not passed to enterFrame. You’ll need to specifically reference the object ‘peng’. Be careful, though - if the player touches the screen before peng is created, you’ll get a nil exception, so check it is not nil before accessing it.

I’d also recommend looking into lua scope. You are doing ‘local bg1’ and then everything after that appears to be global. You could run into problems with memory leaks (memory increasing and increasing when moving back and forth between scenes).

#17

well i added self to enter frame but it gives me the error before restarting

#18

No, I mean ‘event’ is the only parameter ever passed to an enterFrame listener. You can’t use self, you must reference the object directly.

#19

well i changed all the selfs to peng and then i changed local function touchScreen(event) to local function touchScreen(peng,event) and now I get an error for the event (game.lua:77:attempt to index local ‘event’ (a nil value) stack traceback: game.lua:77: in function ‘?’   ?:in function <?:190>) 

do i need to change the event.phase to peng.phase in the ‘if event.phase == “began” then’

also i appreciate you taking the time to respond, this is my first game so im probably making rookie mistakes :stuck_out_tongue:

#20

You cannot pass anything but event to touchScreen because it is an enterFrame listener.

Because you made ‘peng’ a global variable (bad practise but we’ll gloss over that for now), you can just reference ‘peng’ in touchScreen. This is assuming ‘touchScreen’ is always fired AFTER peng has been created.

I think the problem is you haven’t worked through the basic tutorials and samples (and understood them…) to get a handle on the API, so these mistakes are inevitable.