How to Make a Scrolling Game With Enemies

It has been suggested that this page's contents be merged with the page Scrolling (sprites). You can discuss this on the page's talk page. (February 2022)

Example scrolling project thumbnail

A "scrolling game" is a game that, rather than the main sprite, which would move in a normal movement game, the map itself moves. So far, the code required works with every version of Scratch. In the example thumbnail, there are enemies following the main sprite.

Map Movement

In order to create a scrolling game, you need an original player and a map. Create two new sprites, one labeled "player" and one labeled "map" In the map sprite, create two costumes, a blank costume, for sizing, and a costume that will be the main map, it should be the same size as the costume workspace, and should be centered. In the map code space, create four variables.

set [X v] to (0)
set [Y v] to (0)
set [SCROLL X v] to (0)
set [SCROLL Y v] to (0)

Next, create a string for the map

when green flag clicked
switch costume to (blank v) //Switching the costume to blank, allows the size to be changed to bigger sizes than if you were to just have a big costume, because then it wouldn't change the size, or it would set the size even smaller.
set size to (500) %
switch costume to (map v) //Setting it back to the big costume will make it even bigger, and wont change the size.
set [X v] to (0)
set [Y v] to (0)
set [SCROLL X v] to (0)
set [SCROLL Y v] to (0)
forever
go to [back v] layer
if <key (w v) pressed?> then
change [SCROLL Y v] by (5)
end
if <key (s v) pressed?> then
change [SCROLL Y v] by (-5)
end
if <key (a v) pressed?> then
change [SCROLL X v] by (-5)
end
if <key (d v) pressed?> then
change [SCROLL X v] by (5)
end
change [X v] by ((SCROLL X)*(-1))
change [Y v] by ((SCROLL Y)*(-1))
go to x: (X) y: (Y)
if <not <<key (w v) pressed?> or <key (s v) pressed?>>> then
set [SCROLL Y v] to [0]
end
if <not <<key (a v) pressed?> or <key (d v) pressed?>>> then
set [SCROLL X v] to [0]
end

In your player sprite, create a costume that will be used to resemble the player. Next, add a very simple script in the player sprite.

when green flag clicked
forever
go to [front v] layer ::looks
point towards (mouse-pointer v) ::motion
end

Now you have the map/player movement.

Enemies

Create a new sprite, named enemies. Inside the sprite, create a costume that you want your enemies to have.

Create a new variable for this sprite only.

set [clone id v] to [0]

Put a script to hide the variables (optional).

when green flag clicked
hide variable [SCROLL X v]
hide variable [SCROLL Y v]
hide variable [X v]
hide variable [Y v]
hide variable [clone id v]

Create another script, and create a custom block. Run this custom block without screen refresh. Also create two lists.

delete all of [Clone X v]
delete all of [Clone Y v]

when green flag clicked
Generate Clones :: custom

define Generate Clones
delete all of [Clone X v]
delete all of [Clone Y v]
show
set [clone id v] to [0]
repeat [5]
add [] to [Clone X v]
add [] to [Clone Y v]
go to x: (pick random (-350) to (350)) y: (pick random (-350) to (350))
create clone of (myself v)
change [clone id v] by (1)
end
hide

Create one more script.

when I start as a clone
forever
change x by ((SCROLL X) * (-1))
change y by ((SCROLL Y) * (-1))
if <not <touching (Player v) ?>> then
change x by ((2.5) * ([sin v] of (direction)))
change y by ((2.5) * ([cos v] of (direction)))
end
replace item (clone id) of [Clone X v] with (x position)
replace item (clone id) of [Clone Y v] with (y position)
go to [front v] layer
point towards (Player v)

end