Changing some code

tytadas · December 2016

Hello everyone. I have small question to ask, nothing special just about implementing another project to my main game project. I'm using ar2rsawseen's Multi Slider code and I found out it works with scene manager. I implemented it into my project and the multi slider code works great, but.. I imported the slider code into my onEnterEnd function and other buttons lost the functionality with the error:

classes/scenemanager.lua:287: attempt to index field '?' (a nil value)
stack traceback:
	classes/scenemanager.lua:287: in function 'changeScene'
	scenes/gamesc.lua:41: in function <scenes/gamesc.lua:37>

I can see that slider uses sceneManager and a Sprite and I do believe I have to change the sceneManager code to something else so the other buttons could work. I tried addEventListener but none of my codes worked well.

I don't need full code or such, I'm here to ask some tips about what should I use to manage the slider and other buttons to work in the same time.

Thanks

pie · December 2016

Hi, please assume that who reads here doesn't know your project, every detail you can provide could be useful.
I think that the issue is in your code: you should not change scenemanager unless you know why

output says that everything started at
scenes/gamesc.lua:41

What do you have here? You need to trackback from there, until you find the wrong parameter sent to scenemanager:changescene (...).

tytadas · December 2016

Ty pie for the answer!

This is the gamesc.lua file. The line 41 is: "sceneManager:changeScene("storesc", conf.transitionTime, conf.transition, conf.easing)" .

gamesc = Core.class(Sprite)
 
function gamesc:init()
 
 
local background = Bitmap.new(Texture.new("images/background.png", true))
	background:setAnchorPoint(0.5,0.5)
	self:addChild(background)
	background:setPosition(conf.width/2, conf.height/2)
	self:addEventListener("enterEnd", self.onEnterEnd, self)
 
end
 
function gamesc:onEnterEnd()
 
	local backbutton = Bitmap.new(Texture.new("images/backbutton.png", true))
	backbutton:setAnchorPoint(0.5,0.5)
	backbutton:setPosition((conf.height - backbutton:getHeight())/2 - 290, conf.width - 410)
	self:addChild(backbutton)
 
		backbutton:addEventListener(Event.MOUSE_DOWN, function(e)
			if backbutton:hitTestPoint(e.x,e.y,true) then
			gamesc = nil 
			collectgarbage()
			sceneManager:changeScene("mainsc", conf.transitionTime, conf.transition, conf.easing)
			end
			end)
 
 
 
	local storebutton = Bitmap.new(Texture.new("images/storebutton.png", true))
	storebutton:setAnchorPoint(0.5,0.5)
	storebutton:setPosition((conf.height - backbutton:getHeight())/2 - 270, conf.width - 280)
	self:addChild(storebutton)
 
		storebutton:addEventListener(Event.MOUSE_DOWN, function(e)
		if storebutton:hitTestPoint(e.x,e.y,true) then
		gamesc = nil
		collectgarbage()
		sceneManager:changeScene("storesc", conf.transitionTime, conf.transition, conf.easing)
		end
		end)
 
 
	local boostButton = Bitmap.new(Texture.new("images/boostbutton.png", true))
	boostButton:setAnchorPoint(0.5,0.5)
	boostButton:setPosition((conf.height - boostButton:getHeight())/2 - 100, conf.width - 280)
	self:addChild(boostButton)
 
		boostButton:addEventListener(Event.MOUSE_DOWN, function(e)
		if boostButton:hitTestPoint(e.x,e.y,true) then
		gamesc = nil
		collectgarbage()
		sceneManager:changeScene("storesc", conf.transitionTime, conf.transition, conf.easing)
		end
		end)
 
	local profilebutton = Bitmap.new(Texture.new("images/profilebutton.png", true))
	profilebutton:setAnchorPoint(0.5,0.5)
	profilebutton:setPosition((conf.height - profilebutton:getHeight())/2 + 50, conf.width - 280)
	self:addChild(profilebutton)
 
		profilebutton:addEventListener(Event.MOUSE_DOWN, function(e)
		if profilebutton:hitTestPoint(e.x,e.y,true) then
		gamesc = nil
		collectgarbage()
		sceneManager:changeScene("storesc", conf.transitionTime, conf.transition, conf.easing)
		end
		end)
 
 
	--[[local earthselect = Bitmap.new(Texture.new("planetsm/earthplanet.png", true))
	earthselect:setPosition((conf.height - earthselect:getHeight())/2 - 50, conf.width - 35)
	earthselect:setAnchorPoint(0.5,0.5)
	self:addChild(earthselect)
 
	earthselect:addEventListener(Event.MOUSE_DOWN, function(e)
		if earthselect:hitTestPoint(e.x,e.y,true) then
		gamesc = nil 
		collectgarbage() 
		sceneManager:changeScene("gamesc", conf.transitionTime, conf.transition, conf.easing)
		end
		end)
		--]]
		local crates = {
	{"planetsm/mercuryplanet.png", "planetsm/marsplanet.png", "planetsm/earthplanet.png", "planetsm/saturnplanet.png", "planetsm/uranusplanet.png", "planetsm/sunplanet.png"},
}
 
local scenes = {}
 
currentScene = 1
 
for i in pairs(crates) do
	local scene = Core.class(Sprite)
	function scene:init()
		AceSlide.init({parent = self})
		for j in pairs(crates[i]) do
			AceSlide.add(Bitmap.new(Texture.new(crates[i][j], true)))
		end
		AceSlide.show()
 
 
		local leftButton = Button.new(Bitmap.new(Texture.new("images/arrowleft.png")), Bitmap.new(Texture.new("images/arrowleft.png")))
		leftButton:setPosition((application:getContentWidth()-leftButton:getWidth())/5, (application:getContentHeight()/2)-(leftButton:getHeight()/2))
		self:addChild(leftButton)
		leftButton:addEventListener("click", 
			function()	
				AceSlide.prevItem()
			end
		)
 
		local rightButton = Button.new(Bitmap.new(Texture.new("images/arrowright.png")), Bitmap.new(Texture.new("images/arrowright.png")))
		rightButton:setPosition(((application:getContentWidth()-rightButton:getWidth())/5)*4, (application:getContentHeight()/2)-(rightButton:getHeight()/2))
		self:addChild(rightButton)
		rightButton:addEventListener("click", 
			function()	
				AceSlide.nextItem()
			end
		)
 
 
 
		local function onMouseDown(self, event)
			if self:hitTestPoint(event.x, event.y) then
				self.isFocus = true
				self.startY = event.y
				self.initY = self:getY()
				self.y0 = event.y
 
				event:stopPropagation()
			end
		end
 
		local function onMouseMove(self, event)
			if self.isFocus then
				local dy = event.y - self.y0
 
				self:setY(self:getY() + dy)
 
				self.y0 = event.y
 
				event:stopPropagation()
			end
		end
 
		local function onMouseUp(self, event)
			if self.isFocus then
				local back = false
				if self.startY < self.y0 - 10 then
					if currentScene > 1 then
						currentScene = currentScene - 1
						sceneManager:changeScene("scene"..currentScene, 1, SceneManager.moveFromTop, easing.outBack)
					else
						back = true
					end
				elseif self.startY > self.y0 + 10 then
					if currentScene < #crates then
						currentScene = currentScene + 1
						sceneManager:changeScene("scene"..currentScene, 1, SceneManager.moveFromBottom, easing.outBack)
					else
						back = true
					end
				else
					back = true
				end
				if back then
					GTween.new(self, 1, {y = self.initY})
				end
				self.isFocus = false
				event:stopPropagation()
			end
		end
 
		self:addEventListener(Event.MOUSE_DOWN, onMouseDown, self)
		self:addEventListener(Event.MOUSE_MOVE, onMouseMove, self)
		self:addEventListener(Event.MOUSE_UP, onMouseUp, self)
	end
	scenes["scene"..i] = scene
end
 
 
sceneManager = SceneManager.new(scenes)
 
self:addChild(sceneManager)
 
sceneManager:changeScene("scene"..currentScene, 1, SceneManager.flipWithFade, easing.outBack)
 
 
 
 
end

pie · December 2016

Are you defining "storesc" in scenes? can you read conf table?
without the full project is hard for me to debug.

how many SceneManager.new(scenes) do you have in your project?
I see you are creating one global sceneManager object at the end of gamesc.lua, but from your object name gamesc I suppose you already created one, in which you loaded this scene. Am I right?
Maybe you are overwriting the "old" sceneManager, and you're missing the previously defined scenes (where you should have defined "storesc")

tytadas · December 2016

Thanks haha! Your clearly explanation at first was confusing me, but haha I made it out!

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