Changing Scenes causes trouble - GameCreators Forum

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Wizard Ranch

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Posted: 3rd Jan 2022 01:52 Edited at: 3rd Jan 2022 13:29

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Hi there again!

I am currently adding a menu scene to my test game and I'm having already trouble, even though I want to add even two more scenes on top of that.

I have the problem that the sprites of the one scene remain in the other scene and are still being depicted.
Calling "Scene_cleanup()" doesn't do anything. Even when I set every sprite of the scene to invisible, they are still being depicted.

So I'm having my "game scene" and my "menu scene". When I changed the scene from "game" to "menu" it actually worked fine. I just had to call GameScene_cleanup() to clear the sprites. But now that I start the game with the menu scene first, the sprites are overlapping when changing back to the "game scene".

The entire script is quite long and probably hard to read, so I tried to include only the parts that I think could be relevant to this problem. And hoping that it's enough to detect the problem:

//Inluding SCENES:

#include "Menuscene.scene"
#include "Pond.scene"
#include "DeadScene.scene"

//loading menu scene and it's elements in the beginning:
Menuscene_setup()
backanimation=LoadAnimation(MenuScene_back,"Menu/back/back0",29)
anemone=LoadAnimation(MenuScene_anemone,"Menu/anemone/anemone0",19)
coral=LoadAnimation(MenuScene_coral,"Menu/coral/coral0",19)
musicmenu=LoadSound("Audio/musicmenu.wav")
PlaySound(musicmenu,100,1)
Play(backanimation,10)
Play(coral,10)
Play(anemone,15)

//DEFINING WHICH SCENE IS RUNNING:
//Menu Variables:
global MENUDEAD=0
global GAME=0
global MENuSTART=0
global MENuWIN=0

MENU=1

//MAIN GAME LOOP:

do
	print("is menu on?"+STR(MENU))
	if MENU
		if GetVirtualButtonPressed(MenuScene_Play)
			MENU=0
			GAME=1
			StopSound(MusicMenu)
			SetSpriteVisible(MenuScene_back,0)
			SetSpriteVisible(MenuScene_anemone,0)
			SetSpriteVisible(MenuScene_coral,0)
			Pond_setup()
			LoadPond()//loadpond function loads animations and sounds for the game scene
			MenuScene_cleanup()
                        Break()
		endif
		MenuScene_sync()
	    Sync()
	
    elseif GAME
	    print(FoodCount)
	    print(SizeLevel)
	    
	    //all the main game function etc. are here

Pond_sync()
        Sync()
		
    endif
	
	
loop

+ Code Snippet

//Inluding SCENES:

#include "Menuscene.scene"
#include "Pond.scene"
#include "DeadScene.scene"


//loading menu scene and it's elements in the beginning:
Menuscene_setup()
backanimation=LoadAnimation(MenuScene_back,"Menu/back/back0",29)
anemone=LoadAnimation(MenuScene_anemone,"Menu/anemone/anemone0",19)
coral=LoadAnimation(MenuScene_coral,"Menu/coral/coral0",19)
musicmenu=LoadSound("Audio/musicmenu.wav")
PlaySound(musicmenu,100,1)
Play(backanimation,10)
Play(coral,10)
Play(anemone,15)


//DEFINING WHICH SCENE IS RUNNING:
//Menu Variables:
global MENUDEAD=0
global GAME=0
global MENuSTART=0
global MENuWIN=0

MENU=1



//MAIN GAME LOOP:

do
	print("is menu on?"+STR(MENU))
	if MENU
		if GetVirtualButtonPressed(MenuScene_Play)
			MENU=0
			GAME=1
			StopSound(MusicMenu)
			SetSpriteVisible(MenuScene_back,0)
			SetSpriteVisible(MenuScene_anemone,0)
			SetSpriteVisible(MenuScene_coral,0)
			Pond_setup()
			LoadPond()//loadpond function loads animations and sounds for the game scene
			MenuScene_cleanup()
                        Break()
		endif
		MenuScene_sync()
	    Sync()
	
    elseif GAME
	    print(FoodCount)
	    print(SizeLevel)
	    
	    //all the main game function etc. are here

        Pond_sync()
        Sync()
		
    endif
	
	
loop

When I press the virtual "Play" button, the game scene (pond.scene) starts running, but the old sprites remain for some reason.
Thanks for any tips in advance.

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jd_zoo

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Joined: 12th May 2018

Location: Nova Scotia

Posted: 3rd Jan 2022 15:36

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Here is basic example of the way I use to get a multiple scenes. Essentially to load a scene use sceneName_setup(). To unload a scene use sceneName_cleanup(). While in said scene you need to call sceneName_sync() in the main loop.

// Project: scene_test 
// Created: 21-04-29

// show all errors

SetErrorMode(2)

// set window properties
SetWindowTitle( "scene_test" )
SetWindowSize( 1024, 768, 0 )
SetWindowAllowResize( 1 ) // allow the user to resize the window

// set display properties
SetVirtualResolution( 1024, 768 ) // doesn't have to match the window
SetOrientationAllowed( 1, 1, 1, 1 ) // allow both portrait and landscape on mobile devices
SetSyncRate( 30, 0 ) // 30fps instead of 60 to save battery
SetScissor( 0,0,0,0 ) // use the maximum available screen space, no black borders
SetPrintSize(18)
UseNewDefaultFonts( 1 )

#include "home.scene"											//There is 1 scene file that contains 2 different scenes

screenNum as integer = 0											//0 is the home screen
screenChange as integer = 0										//Variable to watch for screen change request

home_setup()														//Setup the first screen to view (this function is auto generated by scene)

do
    if (screenNum = 0)											 //Things to do when at the home screen
    	 home_sync()												//Called every time while in this scene
    	 if (GetSpriteHitTest(home_arrow1, GetPointerX(), GetPointerY()))  and  GetPointerPressed()	//Sprite name is the 'Unique Variable' in the scene editor
	    	screenChange = screenNum + 1							//Increment the screen number
	    	if (screenChange > 1)  then  screenChange = 0		//Reset back to first scene    	
	    endif
    
    elseif (screenNum = 1)										//Things to do when at the second scene
		screen2_sync()
		if (GetSpriteHitTest(screen2_arrow1, GetPointerX(), GetPointerY()))  and  GetPointerPressed()
	    	screenChange = screenNum + 1
	    	if (screenChange > 1)  then  screenChange = 0
	    endif
     endif
    
    
    if (screenChange <> screenNum)								//Screen number change request
    
    	if (screenNum = 0)										//Delete the current scene
    		home_cleanup()										//The delete all text, images and sprite function is auto generated by scene
    	elseif (screenNum = 1)
    		screen2_cleanup()
    	endif
    	
    	if (screenChange = 0)									//Setup the new scene
    		home_setup()											//Setup functions auto geneterated by scene
    	elseif (screenChange = 1)
    		screen2_setup()
    	endif
    	
    	screenNum = screenChange									//Update current scene number
    	
    endif
    
    Print("click arrow to change scenes")
    Print("screenNum = " + str(screenNum))
    Print("screenChange = " + str(screenChange))
    Sync()
loop

+ Code Snippet


// Project: scene_test 
// Created: 21-04-29

// show all errors

SetErrorMode(2)

// set window properties
SetWindowTitle( "scene_test" )
SetWindowSize( 1024, 768, 0 )
SetWindowAllowResize( 1 ) // allow the user to resize the window

// set display properties
SetVirtualResolution( 1024, 768 ) // doesn't have to match the window
SetOrientationAllowed( 1, 1, 1, 1 ) // allow both portrait and landscape on mobile devices
SetSyncRate( 30, 0 ) // 30fps instead of 60 to save battery
SetScissor( 0,0,0,0 ) // use the maximum available screen space, no black borders
SetPrintSize(18)
UseNewDefaultFonts( 1 )


#include "home.scene"											//There is 1 scene file that contains 2 different scenes

screenNum as integer = 0											//0 is the home screen
screenChange as integer = 0										//Variable to watch for screen change request

home_setup()														//Setup the first screen to view (this function is auto generated by scene)

do
    if (screenNum = 0)											 //Things to do when at the home screen
    	 home_sync()												//Called every time while in this scene
    	 if (GetSpriteHitTest(home_arrow1, GetPointerX(), GetPointerY()))  and  GetPointerPressed()	//Sprite name is the 'Unique Variable' in the scene editor
	    	screenChange = screenNum + 1							//Increment the screen number
	    	if (screenChange > 1)  then  screenChange = 0		//Reset back to first scene    	
	    endif
    
    elseif (screenNum = 1)										//Things to do when at the second scene
		screen2_sync()
		if (GetSpriteHitTest(screen2_arrow1, GetPointerX(), GetPointerY()))  and  GetPointerPressed()
	    	screenChange = screenNum + 1
	    	if (screenChange > 1)  then  screenChange = 0
	    endif
     endif
    
    
    if (screenChange <> screenNum)								//Screen number change request
    
    	if (screenNum = 0)										//Delete the current scene
    		home_cleanup()										//The delete all text, images and sprite function is auto generated by scene
    	elseif (screenNum = 1)
    		screen2_cleanup()
    	endif
    	
    	if (screenChange = 0)									//Setup the new scene
    		home_setup()											//Setup functions auto geneterated by scene
    	elseif (screenChange = 1)
    		screen2_setup()
    	endif
    	
    	screenNum = screenChange									//Update current scene number
    	
    endif
    
    Print("click arrow to change scenes")
    Print("screenNum = " + str(screenNum))
    Print("screenChange = " + str(screenChange))
    Sync()
loop

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Wizard Ranch

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Joined: 24th Dec 2021

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Posted: 3rd Jan 2022 16:36 Edited at: 3rd Jan 2022 16:37

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Hey jd_zoo!

Thanks for the code sample!

Quote: "
Essentially to load a scene use sceneName_setup(). To unload a scene use sceneName_cleanup(). While in said scene you need to call sceneName_sync() in the main loop.
"

The thing is that's exactly what I did!
Just that I structured my script differently than yours.

I suppose I will isolate the relevant parts of my code to find out why it's not working, and possibly compare it with your code.

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Wizard Ranch

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Posted: 3rd Jan 2022 16:48 Edited at: 4th Jan 2022 02:17

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This post has been marked by the post author as the answer.

Oh I got it!

My basic menu structure is like this (simplified):

+ Code Snippet

do
	if MENU
		if GetVirtualButtonReleased(MenuScene_Play)
			MENU=0
			GAME=1
			StopSound(MusicMenu)
			Pond_setup()
			MenuScene_cleanup()
			Break()
		endif
		MenuScene_sync()
	
    elseif GAME
	    etc.

I thought if I call the function "Break()", it would break out of the if statements completely, but it doesn't. So after I called "MenuScene_cleanup()", it still called "MenuScene_sync()" one last time before switching to the game scene loop. That's why it still got drawn unto the screen "after" I called "MEnuScene_cleanup()".

Interesting side note: It still got depicted after I set all the sprites to invisible, so that would mean that scene_cleanup() doesn't only remove all drawings unto the screen, but also resets all sprites to visible, right?

Anyways, the solution is to simply call Scene_sync() before the condition that changes the scene, so you don't draw the scene one last time after cleaning it:

+ Code Snippet

do
	if MENU
		MenuScene_sync()
		if GetVirtualButtonReleased(MenuScene_Play)
			MENU=0
			GAME=1
			StopSound(MusicMenu)
			Pond_setup()
			MenuScene_cleanup()
			Break()
		endif
	
    elseif GAME

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jd_zoo

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Posted: 4th Jan 2022 00:02

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Yeah ok so Break() is for the debugger, no? Its not going to stop your game loop (someone correct me if I'm wrong) so yes you would need to make sure the sceneA_sync() doesn't get called after sceneA_cleanup().

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Wizard Ranch

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Posted: 4th Jan 2022 02:12

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Ah ok, I didn't know that! I just assumed it works like python where "break" gets you out of a loop/statement.

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AppGameKit Studio Chat / [SOLVED] Changing Scenes causes trouble

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