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    Parallax in function

    JojojohnJojojohn Member
    edited August 2013 in General questions
    Everytime I put my function BackGround code in a function of a class the output was different. Can somebody help me? Please. Thank you!
    Here is my code:

    sample=gideros.class(Sprite)
    function sample:init()
    ...
    stage:addEventListener(Event.ENTER_FRAME, self.onEnterFrame, self)
    ...
    end

    local bg1 = Bitmap.new(Texture.new("background.jpg"),true)
    local bg2 = Bitmap.new(Texture.new("background.jpg"),true)
    local bgX=0

    function sample:onEnterFrame()
    if self.started then
    function BackGround()
    bgX = bgX - 1
    local newBgX = bg1:getWidth() -(-bgX)
    if newBgX <=0
    then
    bgX=0
    bg1:setX(bgX)
    else
    bg1:setX(bgX)
    bg2:setX(newBgX)
    end
    end
    self:addEventListener(Event.ENTER_FRAME, BackGround)
    self:addChild(bg1)
    self:addChild(bg2)
    end
    end


    *By the way the output here was about the background that goes to right then goes back to the left. Also the speed was increasing. Please I really need your help guys. Thank you!
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    Comments

    • ar2rsawseenar2rsawseen Maintainer
      Accepted Answer
      @Jojojohn most probably your problem is of mixing up scene events and stage events together. If you are using sceneManager you should only do everything for your current scene, without touching the stage.
      http://appcodingeasy.com/Gideros-Mobile
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    • JojojohnJojojohn Member
      edited August 2013
      @ar2rsawseen but I didn't used scenemanager, I only used addEventListener?
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    • ar2rsawseenar2rsawseen Maintainer
      edited August 2013 Accepted Answer
      @Jojojohn your problem is that inside one onEnterFrame event you on each frame add another enterframe event. Thus it inreases the speed because bgX = bgX - 1 is called more and more times on each enter frame as you multiply them on each enter frame
      You need something more like this:
      sample=gideros.class(Sprite)
 
local bg1 = Bitmap.new(Texture.new("background.jpg", true))
local bg2 = Bitmap.new(Texture.new("background.jpg", true))
local bgX=0
 
function sample:init()
    ...
    self:addEventListener(Event.ENTER_FRAME, self.onEnterFrame, self)
    ...
    self:addChild(bg1)
    self:addChild(bg2)
end
 
function sample:onEnterFrame()
    if self.started then
        bgX = bgX - 1
        local newBgX = bg1:getWidth() -(-bgX)
        if newBgX <=0 then
            bgX=0
            bg1:setX(bgX)
        else
            bg1:setX(bgX)
            bg2:setX(newBgX) 
        end
   end
end
      http://appcodingeasy.com/Gideros-Mobile
      +1 -1Share on Facebook
    • JojojohnJojojohn Member
      @ar2rsawseen thank you! :) I removed the function BackGround inside the function sample:onEnterFrame() and it works! :) Thank you so much. I realized my error. Thanks again.
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