Quick questions about Gideros&Lua

Apollo14 · August 2018

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 · August 2018

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 · August 2018

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

pie · August 2018

@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 · August 2018

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

oleg · August 2018

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 · August 2018

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

pie · August 2018

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 · August 2018

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 · August 2018

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 · August 2018

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

Apollo14 · September 2018

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 · September 2018

they could be of different size.

totebo · September 2018

"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 · September 2018

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 · September 2018

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 · September 2018

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 · September 2018

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 · September 2018

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

Apollo14 · September 2018

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 · September 2018

You need to call the instance, not the class

Apollo14 · September 2018

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 · September 2018


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

Apollo14 · September 2018

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 · September 2018

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 · September 2018

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 · September 2018

@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 · September 2018

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 · September 2018

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 · September 2018

Maybe @paulclinger could shed some light on this

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

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