Scene Manager question

Gabriel_Mercês

I'm trying to learn how to use the SceneManager, so I made this:

main.lua:

sceneManager = SceneManager.new({   ["menu"] = Menu,   })   stage:addChild(sceneManager) sceneManager:changeScene("menu")

menu.lua:

Menu = Core.class(Sprite)   function Menu:init() local botao = Bitmap.new(Texture.new("button.jpg")) stage:addChild(botao) end

The button itself doesn't matter. I just putted something on the screen to try the scene management.
The real problem is this:

Uploading finished. main.lua:1: attempt to index nil with 'new' stack traceback: main.lua:1: in function

Am I doing this right? The tutorial i'm following is 5 years old, so if i'm doing something wrong please tell me!
Thanks in advance!!!

MoKaLux

Since it is a plugin I think you need to initialize it:

require "scenemanager"

Other than that, your code looks good.

Let me share how I do it

init.lua:

-- plugins require "scenemanager" require "easing" -- globals screenwidth, screenheight = application:get("screenSize") -- the actual user's screen size, yes! myappleft, myapptop, myappright, myappbot = application:getLogicalBounds() myappwidth, myappheight = myappright - myappleft, myappbot - myapptop ...

main.lua:

-- scene manager scenemanager = SceneManager.new( { ["menu"] = Menu, ["levelX"] = LevelX, -- maker ["levelY"] = LevelY, -- viewer } ) stage:addChild(scenemanager) scenemanager:changeScene("menu") -- tables transitions = { SceneManager.moveFromRight, -- 1 SceneManager.moveFromLeft, -- 2 SceneManager.moveFromBottom, -- 3 SceneManager.moveFromTop, -- 4 SceneManager.moveFromRightWithFade, -- 5 SceneManager.moveFromLeftWithFade, -- 6 SceneManager.moveFromBottomWithFade, -- 7 SceneManager.moveFromTopWithFade, -- 8 SceneManager.overFromRight, -- 9 SceneManager.overFromLeft, -- 10 SceneManager.overFromBottom, -- 11 SceneManager.overFromTop, -- 12 SceneManager.overFromRightWithFade, -- 13 SceneManager.overFromLeftWithFade, -- 14 SceneManager.overFromBottomWithFade, -- 15 SceneManager.overFromTopWithFade, -- 16 SceneManager.fade, -- 17 SceneManager.crossFade, -- 18 SceneManager.flip, -- 19 SceneManager.flipWithFade, -- 20 SceneManager.flipWithShade, -- 21 } easings = { easing.inBack, -- 1 easing.outBack, -- 2 easing.inOutBack, -- 3 easing.inBounce, -- 4 easing.outBounce, -- 5 easing.inOutBounce, -- 6 easing.inCircular, -- 7 easing.outCircular, -- 8 easing.inOutCircular, -- 9 easing.inCubic, -- 10 easing.outCubic, -- 11 easing.inOutCubic, -- 12 easing.inElastic, -- 13 easing.outElastic, -- 14 easing.inOutElastic, -- 15 easing.inExponential, -- 16 easing.outExponential, -- 17 easing.inOutExponential, -- 18 easing.linear, -- 19 easing.inQuadratic, -- 20 easing.outQuadratic, -- 21 easing.inOutQuadratic, -- 22 easing.inQuartic, -- 23 easing.outQuartic, -- 24 easing.inOutQuartic, -- 25 easing.inQuintic, -- 26 easing.outQuintic, -- 27 easing.inOutQuintic, -- 28 easing.inSine, -- 29 easing.outSine, -- 30 easing.inOutSine, -- 31 }

menu.lua:

Menu = Core.class(Sprite)   function Menu:init() -- BG application:setBackgroundColor(0x227178) -- btns -- btnMaker = Button.new(...) -- btns listeners btnMaker:addEventListener("clicked", function() self:gotoScene("levelX") end) -- LISTENERS self:addEventListener("enterBegin", self.onTransitionInBegin, self) self:addEventListener("enterEnd", self.onTransitionInEnd, self) self:addEventListener("exitBegin", self.onTransitionOutBegin, self) self:addEventListener("exitEnd", self.onTransitionOutEnd, self) end   -- GAME LOOP function Menu:onEnterFrame(e) end   -- EVENT LISTENERS function Menu:onTransitionInBegin() end function Menu:onTransitionInEnd() self:addEventListener(Event.ENTER_FRAME, self.onEnterFrame, self) end function Menu:onTransitionOutBegin() self:removeAllListeners() end function Menu:onTransitionOutEnd() end   -- change scene function Menu:gotoScene(xscene) scenemanager:changeScene( xscene, 1, transitions[math.random(1, #transitions)], easings[math.random(1, #easings)] ) end

Hope this helps
https://wiki.gideros.rocks/index.php/SceneManager

Gabriel_Mercês

Thank you veeeery much @MoKaLux !!!
You're making it true for me that Gideros Mobile community is the best!

MoKaLux

Here is a project that uses scenemanager, you may have a look? (just download the zip and open the gideros project):
https://github.com/mokalux/GIDEROS_PLATFORMER_CBUMP_GCAM_TECS

MoKaLux

EDIT: I tested your code and it works fine but you need:
- add scenemanager to gideros plugins (right click Plugins) -> add plugin


- require "scenemanager"

Gabriel_Mercês

Talking about your repository, I just tried now, but seems like there's something wrong. The menu scene appears with just a blue screen. But it's useful anyway. Thank you for sharing!

MoKaLux

the blue screen is maybe this application:setBackgroundColor(0x227178)

PS: don't add your button to the stage but add it to your scene (here the menu scene represented by self)

function Menu:init() local botao = Bitmap.new(Texture.new("button.jpg")) -- stage:addChild(botao) -- not so good self:addChild(botao) -- prefered way, self is your menu sprite defined in Menu = Core.class(Sprite) end

MoKaLux

Gabriel_Mercês said:

Talking about your repository, I just tried now, but seems like there's something wrong. The menu scene appears with just a blue screen. But it's useful anyway. Thank you for sharing!

Ah I see, in the repository the menu scene is empty, just blue background, I was focusing on cbump plugin example. All happen in the LevelX scene

This example is more complete https://github.com/mokalux/PLATFORMER_CBUMP_TECS_20221101_wodt