call function that removes an instance indexed in an array in main

oldschool

Hello,

I want to access a function removeBlock() of an instance of block.lua indexed in my array b[1] from main.lua. *I don't want to remove b[1] i want to removechild the instance at the index in b array.* The long story is I want to load my instances in an array and destroy them in loops in main, like I could in as3.
--main.lua

require("block") main = Core.class(Sprite) a = {} b= {} Yprevious=1; start=0 updown=0 tick=0 -- load background image and add it to the stage local background = Bitmap.new(Texture.new("field.png")) stage:addChild(background)   -- create ball sprites local ball1 = Ball.new("ball1.png") -- create building blocks sprites local block1 = Block.new("block.png")   -- and add ball sprites to the stage stage:addChild(ball1) stage:addChild(block1) -- add block to stage for i=0,4 do   b[1]=block1 end a[1]=ball1;     function onEnterFrame(event)   for i=1,1 do local x, y = a[i]:getPosition();   x = x+1;   if (start==0) or (updown==1) then y=y-1; start=1; end   if updown==0 then y=y+1 end   if (tick>=100) and (updown==1) then updown=0;tick=0 end if (tick>=100) and (updown==0) then   end   if x > 350 then x= 1; end   a[i]:setPosition(x, y); Yprevious=y;   end   tick=tick+1;   end   function mouseD(event) updown=1; d=collCheck_Box2B ( a[1], b[1]) if d==true then print("collide"); b[1] --!!!!! what do I add here to call the RemoveBlock function of the instance of block.lua at b[1]   end end   stage:addEventListener(Event.ENTER_FRAME, onEnterFrame); stage:addEventListener(Event.MOUSE_DOWN, mouseD);   --MikeHart's code from codesnippets function collCheck_Box2B ( source, target ) local rw = source:getWidth()/2.0 + target:getWidth()/2.0 local rh = source:getHeight()/2.0 + target:getHeight()/2.0 if math.abs(source:getY() - target:getY()) < rh then if math.abs(source:getX() - target:getX() ) < rw then   return true end end return false end

--block.lua

Block = Core.class(Sprite)   function Block:init(texture) local bitmap = Bitmap.new(Texture.new(texture)) self:addChild(bitmap)     self:setX(math.random(0, 270)) self:setY(math.random(0, 430))     end   function RemoveBlock() print("remove") --How do I remove this instance end

ar2rsawseen

Honestly, I don't understand a lot of stuff you do there, but
if you want to remove block from stage then, definition of function:

function Block:RemoveBlock() print("remove") --remove from parent self:removeFromParent() end

And then call it like this:

b[1]:RemoveBlock()

oldschool

Worked Perfectly thank you very much!

But why did you add the Block: before the function, Why don't I need the require? I've read stack overflow questions about modules and require, etc and it was this simple. Can you explain this, and where did you learn lua?

PSS. This code is a modified version of jumpballs. I'm bending it into a blitz bomber game. What you don't get is probably my attempts to bend lua to my as3 codebase. I'm used to having an entity framework for all my projects but lua really throws me. Thanks again!

ar2rsawseen

I don't under stand, why for example, you put block instance inside same array element 5 times?

for i=0,4 do b[1]=block1 end

But ok, so by default all files you attach to Gideros project are executed automatically, thus you don't need to call require. Gideros has it's own implementation of Objects as classes, not like default modules in lua.

In your case Block is a classname, you can define class properties
Block.someproperty = 1
and methods function Block:somemethod() end

Of course you can define method with dot:

Block.somemethod = function() --do something end

but it means that self variable will not reference class, but it's own context, meaning:

function Block:init() self.someproperty = "somevalue" end   function Block:methodOne() -- you can access someproperty, because it is the same context --self references to same instance of class Block print(self.someproperty) -- will print out somevalue end   --assigning function to property, call it static method Block.methodTwo = function() --this function has it's own context and is not related to class Block print(self.someproperty) -- will print out nil end --it's the same as simply defining function --completely unrelated to class Block local function methodTwo() end

I've simply learned so much different languages, starting from "low-level" up to weakly typed ones, that I almost don't need to learn new languages anymore, can grasp everything from examples. The power of concept learning, not language learning.

oldschool

Thank you for the explanation. I'm glad your here, have a great day!

I'm a concept learner too(microbiology) but in programming I'm a language learner.

Just leftover junk from a previous iteration. I rarely start from scratch.

for i=0,4 do b[1]=block1 end