Hi Victor,
Image sheets aren’t designed to be placed into groups. They’re just an internal source from which you pull frames. Those display objects go into the display group.
Brent
Thanks Brent,
But how do I solve the problem?
I was just trying things, How do I remove the images from a sprite?
Victor
Hi Victor,
You just remove sprite objects (not sheets) like any normal display object: “display.remove()” or “object:removeSelf()”, followed by “object = nil” to completely remove it from memory.
If you’re getting the error where it says “Attempt to index upvalue ‘dynamiteSprite’ (a nil value)”, that means you have probably created the sprite inside the wrong scope of Storyboard, and then in the exit scene block, you attempt to remove it (but Lua doesn’t know what that object is because you created it in another scope).
Brent
Hi Brent: Still not working.
–I change the name.
–I create the sprite object, outside all the scens (create,enter,exit,destroy), very first on top of the file.
local function buttonDynamiteHandler() audio.play(sfx1, { channel=2 } ) local dynimateSheet = graphics.newImageSheet("flames\_01.png", {width=128, height=128, numFrames=30}) dynamiteSprite = display.newSprite(dynimateSheet, { name="dynamite", start=1, count=30, time=1000, loopCount = 1 } ) dynamiteSprite.x = 512; dynamiteSprite.y = 200 dynamiteSprite.xScale = .9; dynamiteSprite.yScale = .9 dynamiteSprite:play() --dynamiteSprite:pause() return true end
Then on createScene, I have a button that “calls” the “function buttonDynamiteHandler()”
buttonGun = widget.newButton{ defaultFile="buttonGun.png", onRelease = buttonGunHandler } group:insert ( buttonGun ) buttonGun.x = 200; buttonGun.y = 550
And on the destroyScene I have the remove “if”
if dynamiteSprite then dynamiteSprite:removeSelf() dynamiteSprite = nil end
To me that makes logic, I got no errors, but the images from the sprite are still there when I go to another scene.
any idea?
Victor
Hi Victor,
Did you up-reference this as a local variable? Try declaring it above the “buttonDynamiteHandler” function, as in:
[lua]
local dynamiteSprite
[/lua]
Then, when you reach the exit scene (before you attempt to check the “if” it exists), try printing out the value and see what it shows:
[lua]
print( dynamiteSprite )
[/lua]
Hi Brent, It’s good that you mention the “Famous”
“print”
I see that, every half a second, in many places, and I still don’t really get it.
When I put “print” I see nothing in the simulator.
I read that you need the “terminal” or the “console” or something, I don’t really get. How to open it
how to use it, how to see it, what should I look for, nothing…
Could you help me get to understand this “print” and “terminal” command. once and for all
in a more than dummies way, I mean like really super step by step…please?
Hi Victor,
The “print()” function is very, very useful. Many developers use it as a quick-and-dirty “debugging” method, to check the value of some variables at different points in the code. This helps ensure that the variable values are what you expect them to be… and if they’re not, you can usually use more print() statements to figure out why not.
print() will never show anything in the Corona Simulator. It only displays the text (that you printed) in the Terminal/console. If you aren’t running the Terminal/console alongside the Simulator, please read the following guide about how to set it up:
http://docs.coronalabs.com/guide/start/helloWorld/index.html
Brent
I open the terminal first – Then the simulator, that was the key…
I type this in the exitScene as you told me
function scene:exitScene() audio.stop ( ) print( dynamiteSprite ) end
And the terminal has this
----------------------------------------terminal-------------
2013-07-02 10:43:50.490 Corona Simulator[8382:f03] nil
I hope this help you to help me solve this problem
Hello Victor,
I don’t know if this “solves” the problem, but the print() message you see means that “dynamiteSprite” is either:
-
undefined/undeclared in the scope
-
it has been declared but it has not been assigned any value
-
you already cleared it or set it to nil before this point
Please check your code flow carefully again, and see why this is occurring.
Take care,
Brent
Hi Brent:
I bought the Jay Videos, that Corona has in their web site. $37.00, I think they are good, and I’m learning a few things from there, but I still have many other simple questions.
How much do you think it will cost me, for somebody, to tell me the answer to this question? The sprites problem.
If you know somebody that will be willing to actually tell me how to do that?
I have the sprite and it works, only the first time. After that the image is there always when I go to another scene.
this is the complete code, there is nothing else
-- --==\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*++-- -- -- How to make an app -- By Victor M. Barba -- Copyright 2013 -- All Rights Reserved -- -- Version 1.0 -- --==\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*++-- -- ------------------------------------------------------------------------------------------ -- --==\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*[STORYBOARD REQUIRE]\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*++-- -- ------------------------------------------------------------------------------------------ local storyboard = require( "storyboard" ) local widget = require "widget" local scene = storyboard.newScene() ------------------------------------------------------------------------------------------ -- --==\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*[VARIABLES]\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*++-- -- ------------------------------------------------------------------------------------------ local buttonHome local buttonBack local buttonGun local buttonDynamite local fireSprite local fireSprite2 local dynamiteSprite local gunSheet local gunSprite local sfx1 = audio.loadSound( "sfxExplosion1.mp3") local sfx3 = audio.loadSound( "sfxFire1.mp3") local sfx4 = audio.loadSound( "sfxGunsShot1.mp3") ------------------------------------------------------------------------------------------ -- --==\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*[FUNCTIONS]\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*++-- -- ------------------------------------------------------------------------------------------ local function buttonHomeHandler() storyboard.gotoScene( "mainMenu", "zoomInOutFade", 200 ) return true end local function buttonBackHandler() storyboard.gotoScene( "animation", "fromLeft", 200 ) return true end local function buttonGunHandler() audio.play(sfx4, { channel=1 } ) gunSheet = graphics.newImageSheet("flames\_05.png", {width=128, height=128, numFrames=30}) gunSprite = display.newSprite(gunSheet, { name="sp", start=1, count=30, time=1000, loopCount = 1 } ) gunSprite.x = 322; gunSprite.y = 505 gunSprite.xScale = .9; gunSprite.yScale = .9 gunSprite:play() --gunSprite:pause() return true end local function buttonDynamiteHandler() audio.play(sfx1, { channel=2 } ) local dynimateSheet = graphics.newImageSheet("flames\_01.png", {width=128, height=128, numFrames=30}) dynamiteSprite = display.newSprite(dynimateSheet, { name="dynamite", start=1, count=30, time=1000, loopCount = 1 } ) dynamiteSprite.x = 512; dynamiteSprite.y = 200 dynamiteSprite.xScale = .9; dynamiteSprite.yScale = .9 dynamiteSprite:play() --dynamiteSprite:pause() return true end ------------------------------------------------------------------------------------------ -- --==\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*[CREATE SCENE]\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*++-- -- ------------------------------------------------------------------------------------------ function scene:createScene( event ) local group = self.view local background = display.newImage( "spritesSample.png" ) group:insert ( background ) buttonHome = widget.newButton{ defaultFile="buttonHome.png", onRelease = buttonHomeHandler } group:insert ( buttonHome ) buttonHome.x = 910 buttonHome.y = 710 buttonBack = widget.newButton{ defaultFile="buttonBack.png", onRelease = buttonBackHandler } group:insert ( buttonBack ) buttonBack.x = 100 buttonBack.y = 710 buttonGun = widget.newButton{ defaultFile="buttonGun.png", onRelease = buttonGunHandler } group:insert ( buttonGun ) buttonGun.x = 200; buttonGun.y = 550 buttonDynamite = widget.newButton{ defaultFile="buttonDynamite.png", onRelease = buttonDynamiteHandler } group:insert ( buttonDynamite ) buttonDynamite.x = 300; buttonDynamite.y = 200 end ------------------------------------------------------------------------------------------ -- --==\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*[ENETER SCENE]\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*++-- -- ------------------------------------------------------------------------------------------ function scene:enterScene( event ) local group = self.view audio.play(sfx3, { channel=3, loops=-1, fadein=1000 } ) fireSprite = graphics.newImageSheet("flames\_04.png", {width=128, height=128, numFrames=30}) fireSprite = display.newSprite(fireSprite, { name="fire", start=1, count=30, time=1000 } ) fireSprite.x = 880; fireSprite.y = 400 fireSprite.xScale = 1.5; fireSprite.yScale = 1.5 fireSprite:play() fireSprite2 = graphics.newImageSheet("flames\_04.png", {width=128, height=128, numFrames=30}) fireSprite2 = display.newSprite(fireSprite2, { name="fire2", start=1, count=30, time=1000 } ) fireSprite2.x = 840; fireSprite2.y = 445 fireSprite2.xScale = 1.3; fireSprite.yScale = 1.3 fireSprite2:play() end -------------------------------------------------------------------------------------- --------------------------------------------------------------EXIT SCENE---------- function scene:exitScene() audio.stop ( ) end -------------------------------------------------------------------------------------- -- --==\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*[DESTROY SCENE]\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*++-- -- function scene:destroyScene( event ) local group = self.view if buttonHome then buttonHome:removeSelf() buttonHome = nil end if buttonBack then buttonBack:removeSelf() buttonBack = nil end if buttonGun then buttonGun:removeSelf() buttonGun = nil end if buttonDynamite then buttonDynamite:removeSelf() buttonDynamite = nil end if fireSprite then fireSprite:removeSelf() fireSprite = nil end if fireSprite2 then fireSprite2:removeSelf() fireSprite2 = nil end if dynamiteSprite then dynamiteSprite:removeSelf() dynamiteSprite = nil end if gunSprite then gunSprite:removeSelf() gunSprite = nil end end ---------------------------------------------------------------------------------- scene:addEventListener( "createScene", scene ) scene:addEventListener( "enterScene", scene ) scene:addEventListener( "exitScene", scene ) scene:addEventListener( "destroyScene", scene ) return scene
If you know anyone that can actually tell me how? Please let me know…
and how much it will cost me.
Thank you Brent.
Hi Victor,
Do you wish to hire somebody to basically solve/write this entire scene and its functionality? If so, you may want to post the request in the Corona Marketplace forum:
http://forums.coronalabs.com/forum/586-corona-jobs/
Otherwise, this is a big amount of code for us to look through and determine where the problem is. Somebody may help you out, but typically requests with large blocks of code (especially an entire Storyboard scene module) will not get as much response. With Storyboard, there are a lot of events and functions being triggered at different times, so it probably requires the entire scene to be reverse-engineered.
Sincerely,
Brent Sorrentino
Hi Brent, Thanks…
I did not know about the Corona Marketplace…
I will take a look at that
Thank you.
Victor
@helloworld2013d looks like you have gone through several changes. if you want to email me the part of the code to my email address which is my name doubleslashdesign ( at ) gmail then I’ll check it out and see if I can lend a hand.
Larry