Hey people,

Im a relatively new scratcher, so please don't tear down my work! Today, I started work on a space shooter, and I wanted to make a scrolling backdrop, but I ran into a bug. Its fine for the first few seconds, but after that, there's always a HUGE gap flashing every now and then between the backdrop and its clone. Check out my code, hopefully you can tell me i did something wrong, and a possible way I can fix it!

when flag clicked

go to x: [0] y: [0]

create clone of [myself]

set [LIGHTSPEED] to [4]

forever
if <(x position) > (-465)>then
change x by ((LIGHTSPEED)*(-1))
else
go to x: [0] y: [0]
end
end

the second block of code is here:

when I start as a clone

go to x: [0] y:[0] 


forever
if <(x position) > (35)>then
change x by ((LIGHTSPEED)*(-1))
else
go to x: [350] y: [0]
end
end

Thanks,
Delta Dinosaur

Try not using a clone, and make the background scroll continuously. I’ll show the new script here:

when green flag clicked
forever
if <(x position) = [position right before white appears]> then
go to x: [starting position] y: [your choice]
else
move [speed and direction] steps
wait [optional] secs
end

Thanks, I'll give it a try!

AidyGamer60 wrote:

Try not using a clone, and make the background scroll continuously. I’ll show the new script here:

when green flag clicked
forever
if <(x position) = [position right before white appears]> then
go to x: [starting position] y: [your choice]
else
move [speed and direction] steps
wait [optional] secs
end

Thanks a lot for your response, but I still have a big white gap when its moving.

Any other ideas?

Hey people,

I have found a soloution, but I ran into another bug. There's a skip during the time it moves back. It kinda skips forward, but there isnt a gap. Do you think I should find another method? Here's my code:

when flag clicked
go to x: [-15] y: [0]
create clone of [myself]
set [LIGHTSPEED] to [4]
forever
if <(x position) > (-465)>then
change x by ((LIGHTSPEED)*(-1))
else
go to x: [-15] y: [0]
end
end

the second block of code is here:

when I start as a clone
go to x: [465] y:[0] 
forever
if <(x position) > (15)>then
change x by ((LIGHTSPEED)*(-1))
else
go to x: [465] y: [0]
end
end

Thanks,
Delta Dinosaur

That isn’t a bug The background might be uneven. Try making a pattern on the background! That might help it.

Hey people, here is what I was working on, so check out the code for yourself:

https://scratch.mit.edu/projects/402519204/

Hey people,

I've found a fix by adjusting the code even more, and adding a backdrop to cover the bugs. Check out my game on the link on the post above, so you can see my coding and stuff.

Thanks,
DeltaDinosaur

All you need to do to create a. scaling background is to mesh multiple sprites together, as they move across the screen

Maybe make humongous Sprite acting lick a background, and do this?:

Code for character:

when green flag clicked
go to x: (0) y: (0)
forever
if <key [right arrow] pressed?> then
change [backgroundx] by (10)
end
end

Code for sprite acting as background:

when green flag clicked
forever
set x to (backgroundx)
end

And just repeat all that code for every single arrow key. Also, you need to create a new variable called backgroundy, and use that for the up and down arrows.
Right arrow: Change backgroundx by 1.
Left arrow: Change backgroundx by -1
Up arrow: Change backgroundy by 1
Down arrow: Change backgroundy by -1

I haven't tested this method, and it might work… I dunno. Also this background doesn't last forever. Sorry if I'm necroposting. Maybe this will help the owner of this topic I dunno.

You can use frames instead, like you can have many backdrops that infinitely loop, and in each backdrop, the elements move forward a little, and after they run out of the screen, then let it go back to the top of the screen at the same position. If you don't quite get what I mean, you can have a look at my 1s1s1c platformer, it uses this method to do the snowing effect.

please help me

Make a variable called XPos. Then create two sprites that are acting as a backdrop, that are identical, then do this:

Code for 1st sprite acting as a backdrop:

when green flag clicked
forever
set x to (XPos)
end

Code for 2nd sprite acting as a backdrop:

when green flag clicked
forever
set x to ((XPos) + (480))
end

Now make a player or empty sprite, and do this.

Code if you have player:

when green flag clicked
set rotation style [left-right]
set [XPos] to [0]

when [right arrow] key pressed
point in direction (90)
change [XPos] by (-5)

when [left arrow] key pressed
point in direction (-90)
change [XPos] by (5)

Code if you have empty sprite:

when green flag clicked
set [XPos] to [0]

when [right arrow] key pressed
change [XPos] by (-5)

when [left arrow] key pressed
change [XPos] by (5)

That's it! I haven't tested it though.
If this doesn't work try this: https://coderdojoathenry.org/2016/03/01/beginners-scratch-challenge-12-scrolling-backgrounds/

I want to Code a scrolling backround on a backdrop not a sprite pls help

Kisaan10 wrote:

I want to Code a scrolling backround on a backdrop not a sprite pls help

Please make your own topic. As far as I know, there is no way to use a backdrop as a scrolling background. The only way theoretically to do this would be to have multiple stage costumes for each x position you can scroll so there would be 480 costumes minimum.

DeltaDinosaur wrote:

Hey people,

Im a relatively new scratcher, so please don't tear down my work! Today, I started work on a space shooter, and I wanted to make a scrolling backdrop, but I ran into a bug. Its fine for the first few seconds, but after that, there's always a HUGE gap flashing every now and then between the backdrop and its clone. Check out my code, hopefully you can tell me i did something wrong, and a possible way I can fix it!

when flag clicked

go to x: [0] y: [0]

create clone of [myself]

set [LIGHTSPEED] to [4]

forever
if <(x position) > (-465)>then
change x by ((LIGHTSPEED)*(-1))
else
go to x: [0] y: [0]
end
end

the second block of code is here:

when I start as a clone

go to x: [0] y:[0] 


forever
if <(x position) > (35)>then
change x by ((LIGHTSPEED)*(-1))
else
go to x: [350] y: [0]
end
end

Thanks,
Delta Dinosaur

Try using this video by the scratch team:.
Here is the link: https://youtu.be/CvSOVWyyjJI