Quick questions about Gideros&Lua

Apollo14

In Google Play Dev Console there's message "To add in-app products, you need to add the BILLING permission to your APK".

There's no 'billing permission' in Gideros' 'Require' plugin.
It sets automatically when we include 'IAP' plugin?

SinisterSoft

Yes, then upload your apk as an alpha, beta or whatever and it should then be enabled, you add the IAP in the play console, then add it to your Lua code.

Apollo14

Guys, how can we make colored PNG picture black-and-white? (after adding it to stage)

pie

@Apollo14 I think a shader is the only option, I have not tested setColorTransform() but I suppose it would render the bitmap as a black square. Could be worth a try though

keszegh

maybe there is an appropriate blending mode to achieve this, but i don't know which if any.

oleg

keszegh said:

maybe there is an appropriate blending mode to achieve this, but i don't know which if any.

1-Sprite.ZERO,
2-Sprite.ONE,
3-Sprite.SRC_COLOR,
4-Sprite.ONE_MINUS_SRC_COLOR,
5-Sprite.DST_COLOR,
6-Sprite.ONE_MINUS_DST_COLOR,
7-Sprite.SRC_ALPHA,
8-Sprite.ONE_MINUS_SRC_ALPHA,
9-Sprite.DST_ALPHA,
10-Sprite.ONE_MINUS_DST_ALPHA,
11-Sprite.SRC_ALPHA_SATURATE

hgy29

Maybe you should read: http://giderosmobile.com/forum/discussion/6554/desaturate-sprite/p1

pie

great hgy29! I totally forgot about that
I feel there is a need to give an order to all these useful examples and snippets!

oleg

Apollo14 said:

Guys, how can we make colored PNG picture black-and-white? (after adding it to stage)

just make a black and white copy of png and upload it to the project,

Apollo14

oleg said:

Apollo14 said:

Guys, how can we make colored PNG picture black-and-white? (after adding it to stage)

just make a black and white copy of png and upload it to the project,

that's really good and simple way, I'm surprised I didn't think about this method
though in some cases just applying shader could be more convenient

oleg

@Apollo14
hgy29 answered while I was writing, and I did not see his answer

Apollo14

Why in the classic 'Button.lua' class it adds/removes bitmaps to stage every time?
Isn't it better to just use "setTexture"?
Original code inside Button.lua:

if state then if self:contains(self.upState) then self:removeChild(self.upState) end   if not self:contains(self.downState) then self:addChild(self.downState) end else--...

My guess:

local btnTextureNormal,btnTexturePushed=Texture.new("pics/btn_normal.png",true),Texture.new("pics/btn_pushed.png",true) local btn=Bitmap.new(btnTextureNormal) stage:addChild(btn)   stage:addEventListener(Event.TOUCHES_BEGIN, function() btn:setTexture(btnTexturePushed) end)   stage:addEventListener(Event.TOUCHES_END, function() btn:setTexture(btnTextureNormal) end)

keszegh

they could be of different size.

totebo

"Isn't it better to just use "setTexture"?"

I think the answer is yes, most of the time.

My custom Button class still uses sprites and setVisible() instead. This allows me to use movie clips, or custom classes, for each button state.

If that's not needed, bitmap:setTextureRegion() is probably the most efficient.

Apollo14

Guys, when we work with classes, we should avoid attaching objects to 'self'? (make them all local wherever we can?)

function StartScene:init() self.bg=Bitmap.new(Texture.new("pics/background.png",true)) self:addChild(self.bg)   self.iconCoin=Bitmap.new(Texture.new("pics/icon_coin.png",true)) self:addChild(self.iconCoin) end

OR:

function StartScene:init() local bg=Bitmap.new(Texture.new("pics/background.png",true)) self:addChild(bg)   local iconCoin=Bitmap.new(Texture.new("pics/icon_coin.png",true)) self:addChild(iconCoin) end

totebo

Yes, if possible, because local variables are a lot faster. A couple of things to note:

- You can make local variables scoped to the class if you declare them outside the functions. By doing this at the top of the document all methods can share the var.
- If you do use class scoped local vars, they will be shared by all instances. This might not be desirable, in which case you have to use self.var.

Apollo14

totebo said:

Yes, if possible, because local variables are a lot faster. A couple of things to note:

- You can make local variables scoped to the class if you declare them outside the functions. By doing this at the top of the document all methods can share the var.
- If you do use class scoped local vars, they will be shared by all instances. This might not be desirable, in which case you have to use self.var.

wow this is exactly what I wanted to know, many thanks!

Apollo14

Guys how to show numeric keyboard?
Either my syntax is incorrect, or there's a bug:

newInputDialog = TextInputDialog.new("my title", "my message", "some text", "Cancel", "OK")   newInputDialog:setInputType(NUMBER) --crashes app newInputDialog:setInputType(TextInputDialog.NUMBER) --doesn't show numeric keyboard when I call newInputDialog:setInputType:show()   newInputDialog:addEventListener(Event.COMPLETE, function() print "number was entered" end)   self:addEventListener(Event.TOUCHES_END, function(event) if userNumButton:hitTestPoint(event.touch.x,event.touch.y) then newInputDialog:show() end end)

pie

@Apollo14 try TextInputDialog.PHONE as a parameter to newInputDialog:setInputType()

Apollo14

I've created 'StartScene.lua', loaded it with SceneManager as usual.
I don't get why I can't access object 'StartScene.bg' from outside of StartScene:init() function?

StartScene = Core.class(Sprite)   function StartScene:init() self.bg=Bitmap.new(Texture.new("pics/background.png",true)) self:addChild(self.bg)   self.iconCoin=Bitmap.new(Texture.new("pics/icon_coin.png",true)) self:addChild(self.iconCoin) end   function StartScene:setObjectsVisible(param) if param==false then self.bg:setVisible(false) elseif param==true then self.bg:setVisible(true) self.iconCoin:setVisible(true) end end   --this function doesn't work when I call it later: StartScene:setObjectsVisible(false) --StartScene.lua:201: attempt to index field 'bg' (a nil value)

hgy29

You need to call the instance, not the class

Apollo14

hgy29 said:

You need to call the instance, not the class

Thx! Can you please share a code snippet? (I didn't get exactly how to do it)

something like that?

StartScene = Core.class(Sprite) local bg, iconCoin   function StartScene:init() bg=Bitmap.new(Texture.new("pics/background.png",true)) self:addChild(bg)   iconCoin=Bitmap.new(Texture.new("pics/icon_coin.png",true)) self:addChild(iconCoin) end   function StartScene:setObjectsVisible(param) if param==false then bg:setVisible(false) iconCoin:setVisible(false) elseif param==true then bg:setVisible(true) iconCoin:setVisible(true) end end

hgy29

scene=StartScene.new()
scene:setObjectsVisible(false)

Apollo14

Yes, but this is my scene class, I don't call directly 'StartScene.new()', it is used in Scene Manager

sceneManager = SceneManager.new({ ["StartScene"] = StartScene, })

Is it possible somehow to access 'StartScene.bg' object?
Or I should stick to the solution with local vars scoped to the class?

pie

If I recall correctly, I think that you can use sceneManager.scene1.bg

bg has to be a property of your scene class, and your scene has to be the current one (has to be loaded by sceneManager)

Apollo14

pie said:

If I recall correctly, I think that you can use sceneManager.scene1.bg

bg has to be a property of your scene class, and your scene has to be the current one (has to be loaded by sceneManager)

it doesn't work

StartScene.lua:201: attempt to index field 'startScene' (a nil value)

pie

@Apollo14 wait, don't be sad I feel there is something wrong in your implementation if you get the name of the scene in the error output. It may still work:

Assuming your sceneManager instance is called SM and you have opened your startScene there:

SM.scene1.bg should return something (still if I am not wrong, I can't check how I did it right now.. )

If the code you provided is your actual code, and you already loaded "startScene" there, it should be:

sceneManager.scene1:SetObjectsVisible (false)

And of course, to make it work you should have access to the sceneManager instance (which is the parent of your loaded scene): so it should be either a global object or if it's a local object you have to call it from within the same scope.

P.s. however you could also check sceneManager source to fix naming: it seems to me that it used self.scene1 and self.scene2 to store scenes and apply the transitions.

Apollo14

author of Zerobrane Studio mentioned that whole Zerobrane program was made using Lua
Do you know what IDE is used for developing and compiling windows software like that? (using Lua)

oleg

Apollo14 said:

Do you know what IDE is used for developing and compiling windows software like that? (using Lua)

для простих задач, я використовую AutoIt -це не Lua, але теж дуже простий скрипт

antix

Maybe @paulclinger could shed some light on this

Lua really needs a decent IDE like Visual Studio with drag and drop GUI creation.