Something is wrong with my code

tytadas

I've been playing around with few projects, and I fixed a code in the way I do need it, but somehow it prints like a "lines" after the bottom or top or the picture is reached( I don't know, it's just the lines). What's the best way to remove the horizontal lines from moving background?

main.lua

sceneManager = SceneManager.new({ --start scene ["back"] = back, ["BGpara"] = BGpara,   }) --add manager to stage stage:addChild(sceneManager)   --start start scene sceneManager:changeScene("back", 1, SceneManager.moveFromBottom, easing.outBack)

BGpara.lua

BGpara = Core.class(Sprite)   function BGpara:init(bgs, bgspeed)   self.bg1 = Bitmap.new(Texture.new(bgs.bg1),true) self.bg2 = Bitmap.new(Texture.new(bgs.bg1),true)       self.bgFarY=0 self.bgNearY=0 self.bgspeed = bgspeed   self:addChild(self.bg1) self:addChild(self.bg2)         self:addEventListener(Event.ENTER_FRAME, self.BGparas, self) end     function BGpara:BGparas(event, container)   self.bgFarY = (self.bgFarY or 0) - ((self.bgspeed or 4.0) / 4) self.bgNearY = (self.bgNearY or 0) - ((self.bgspeed or 4.0))     self.newFarY = self.bg1:getWidth() -(-self.bgFarY) if self.newFarY <=0 then self.bgFarY = 0 self.bg1:setX(self.bgFarY) else self.bg1:setX(self.bgFarY) self.bg2:setX(self.newFarY) end       end     function BGpara:setSpeed(bgspeed) self.bgspeed = bgspeed end   function BGpara:getSpeed() return self.bgspeed end

back.lua

back = Core.class(Sprite) application:setKeepAwake(true) application:setOrientation("landscapeLeft")   local bgs = { bg1 = "bg1.png", }     local bg = BGpara.new(bgs, 15)     stage:addChild(bg)

pie

can you post a screenshot/video of the issue?

tytadas

https://i.imgsafe.org/b2a3f9ef68.png Can you see it?

pie

Yes, I see the line, but I am still not sure about what should happen and which shapes the png have

Please correct me if I am wrong:
you are doing a horizontal parallax scrolling background, with 2 layers (2 textures: one near moving quick, the other far which moves slow).

When and where does the white line appear? Does it happen when the textures overlap? Are you sure it's not a wrong "cut" of the "nearest" png?
I can't tell without seeing the images: could you post those too?

tytadas

I think it would be better if you take a look at my full project file.
https://uploadfiles.io/4d0a61

No, I want to make a vertical parallax scrolling background, for now just with 1 texture.

In my opinions the line appears after the image is scrolled down. Maybe that's the problem, I'm just trying to make it with one picture for now

pie

there are no images in your file
I assumed it was horizontal scrolling because X and width are processed in your code, even if you call your variables farY and nearY

If you don't have the white line in your png, it could happen due to some slowdown moving the two images together: try overlapping them by 4 pixels (which is your default scroll speed)

tytadas

I'm sorry, here now I added the image: https://ufile.io/b6d95

Okei, I'll try to overlap them by 4 pixels, one momento

pie

@tytadas don't bother, keep the code clean.
Your issue is in the png, you have 2 translucent lines of pixels on both sides.
try using the attached image, I just cut them out

[edit: P.S. this is horizontal scrolling to me ]

tytadas

Yea you were right But the image scrolls vertically ;p Really Big Thanks for the Help! ;;)