Scratch

With scratch you can easily see how the code does.

But if you don't get it it isn't hard to learn. All it is, is a variable tell sprites where to go on the x axis.

So if you make a code block like this:
set x to (scrollX)

If scrollX is equal to 1000 then the sprite's x position will be set to 1000.

And since the width of the screen for scratch is 480 we will want to move a sprite over by a multiple of 480 so that the sprites appear to be synchronized.

I am going to try to give you a visual example.

The _ represents a distance of 480 horizontally from point 0.
The - also represents a distance of 480 horizontally from point 0
the 1 is sprite one and the 2 is sprite two
The scrollX variable is set to 0

_______________________________________
1-----2--------------------------------------------------

If you count the "-"s, sprite 1 is in place 0 (it starts at zero, a lot of things in programming do) and sprite 2 is in place 6

So making sprite one go to that position is easy right? Just put this script

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

Then sprite one will set it's x position to 0 like we want it to.

But there is a bit of a problem with sprite two. Since we don't want sprite two's x position to be 0 like sprite one's we will have to put in some code that can move it.
Since sprite two is in position 6 it means that its distance horizontally from position 0 is 480 multiplied by its position.

Well its position is 6 so this script should make sprite 2 move to position 6.

when green flag clicked
forever
set x to (scrollX+ (480*6))
end

There, now our sprite's x coordinate should be 480*6 which is equal to 2880.

Now that we have that set up what will happen if the user set the scrollX variable to 480? I will demonstrate with my visual.

_______________________________________
-1-----2--------------------------------------------------

Because the scrollX variable was changed from 0 to 480, our sprites move 480 more units to the right!

By changing the scrollX variable we can make the sprite go to any point along the x axis. If you synchronize your sprites using the 480*sprite position  trick then you can create a large scrolling landscape.

Hope this was helpful. I really can't explain it any better.

wow. thanks so much. i get it now... lol now i won't have to use those tutorials anymore!

archmage didn't explain this though, scrolling enemies! he described stationary objects also, but this is for one that moves, each enemy will have their own scrollX obviously, so first we start with movement

if scrollX > myscrollX

then change scrollX by ***** (number must be positive(this is for moving left)

if scrollX < myscrollX

then change scrollX by****** (number must be negative(this is for moving right)
___________________________ end of script


this is for jumping:

if Yposition of sprite** < my Yposition

then set Yspeed to 4-6
set jumping to 1
change Y by Yspeed
repeat until touching ground color
change Y by Yspeed
change Yspeed by -0.2

once done with that
set Y speed to 0
set jumping to 0
___________________ end of script

now for sensing:

if not touching ground color and jumping = o

then repeat until touching ground color or jumping = 1
change Y by Yspeed
change Yspeed by -0.2

once done
if jumping = o
then set Yspeed to 0

if color a different color then at the feet, but similar is touching color ground color
then change Y by 5
(this allows you to go above the ground without bouncing)

(other if's can be added for sensors for things such as walls through more color sensors)
___________________ end of script

that's the basic design I use for side scrolling enemies sometimes they'll be more special and will require health variables and other things, but this covers a basic description

Neoroland wrote:

<when green flag clicked>
<if><mouse down?>
<switch to costume[1]>
<say[hoi]
<play sound[arggggg]
<say[im go ing to kill you]
<switch to costume[black]
lol

what's this got to do with anything?

coolstuff wrote:

Neoroland wrote:

<when green flag clicked>
<if><mouse down?>
<switch to costume[1]>
<say[hoi]
<play sound[arggggg]
<say[im go ing to kill you]
<switch to costume[black]
lol

what's this got to do with anything?

uhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh..................................*runs t astalia*

This should help: http://scratch.mit.edu/projects/Chrischb/339757

Try -480 instead?

I still don't get it, can someone just show me what to put on my scripts, that's all I'll need.