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    Variable Scope

    ArtLeeAppsArtLeeApps Member
    edited June 2013 in General questions
    Hi all,

    You really need a Category called "Regular Newbie Questions" :)

    Knowing that "local" is best as its memory friendly.....

    Question 1)

    If you declare a variable in the main file using "local"
    eg.
    local gameHeight = application:getContentHeight()

    Can scenes or Classes access the variable ?
    * In some languages, the scope of the variable is known by called procedures.. etc.

    Question 2)

    If i were to use global variables for the application height and width. Given in this case i fix the orientation of the game to portrait. Can i get the size once in main and use it throughout the game... eg.

    gameHeight = application:getContentHeight()


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    Comments

    • sslivkasslivka Member
      edited June 2013 Accepted Answer
      @ArtLeeApps
      -Can scenes or Classes access the variable ?
      No
      -- myclass.lua
MyClass = Core.class()
function MyClass:init()
	print(myLocalVar)
end
 
-- main.lua
local myLocalVar = "Hello, World!"
local myClass = MyClass.new()
print(myLocalVar)
 
--[[ return
main.lua is uploading.
myclass.lua is uploading.
Uploading finished.
nil
Hello, World!
]]
      -Can i get the size once in main and use it throughout the game...
      Yes, and you can:
      application.H = application:getContentHeight()
print(application.H)
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    • ArtLeeAppsArtLeeApps Member
      @sslivka thank you, you've made that very clear.
      Likes: Gideros Mobile, Maltesers, Portal Devices
      http://artleeapps.com/
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    • gmarinovgmarinov Member
      strictly speaking that's a Lua question, not a Gideros question...............
      http://esem.name/sound ♫ sound and music at ShadyLabs (Clouds of Steel, Aftermath Alvin)
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    • ArtLeeAppsArtLeeApps Member
      @gmarinov I'm sure your absolutely correct.

      But then i would have to find a Lua forum, and i don't think i would find people more helpful and knowledgeable about Lua and Gideros in one place than here :-)

      Plus, I'm still green and the distinction between the two is like flour and icing sugar, you can't really tell until you taste it....... :)

      Likes: Platypus

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    • gmarinovgmarinov Member
      @ArtLeeApps, I can't recommend Roberto Ierusalimchy's "Programming in Lua" enough. Read and practice for a weekend, it's like magic.
      http://esem.name/sound ♫ sound and music at ShadyLabs (Clouds of Steel, Aftermath Alvin)
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    • ArtLeeAppsArtLeeApps Member
      @gmarinov thank you, i just downloaded it for reading on the train. i spend about 1.5hours everyday to work/back.
      Likes: Gideros Mobile, Maltesers, Portal Devices
      http://artleeapps.com/
      Bubble Adventure - Colors
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