Discuss Scratch

#1July 16, 2026 06:02:21
Tubeonscratch
Scratcher
100+ posts

Edge

If on edge, bounce and{
} :: motion
#2July 16, 2026 07:32:22
secretuch
Scratcher
500+ posts

Edge

No support because there is a workaround


if on edge, bounce
insert blocks here:: stack grey
#3July 16, 2026 13:41:46
Za-Chary
Scratcher
1000+ posts

Edge

secretuch wrote:

No support because there is a workaround

if on edge, bounce
insert blocks here:: stack grey
This is actually not a workaround. Suppose you wanted to make a sprite bounce off the walls, and every time it does, it changes color (and doesn't change color until it bounces off a wall). This would work if you run the following code using the OP's proposed block:

turn cw (45) degrees
forever
move (5) steps
if on edge, bounce and{
change [color v] effect by (50)
} :: motion
end

However, the following blocks using your proposed workaround would case the sprite to always change color, even when it is not currently bouncing off of a wall (try it to see what happens):

turn cw (45) degrees
forever
move (5) steps
if on edge, bounce
change [color v] effect by (50)
end

The “if on edge, bounce” block is kind of interesting because there is an “if” statement that is confined to that block only. No other actions can be associated to the “if” statement in this particular block. That's why the OP's suggestion has merit.
#4July 16, 2026 13:45:22
cutellama12345
Scratcher
100+ posts

Edge

You could just do
if on edge, bounce
if <touching edge> then
do whatever you want to do
end
#5July 16, 2026 14:04:03
Za-Chary
Scratcher
1000+ posts

Edge

cutellama12345 wrote:

You could just do
if on edge, bounce
if <touching edge> then
do whatever you want to do
end
Interestingly, this doesn't work either. I just tried it using my post above as a basis:

turn cw (45) degrees
forever
move (5) steps
if on edge, bounce
if <touching [edge v]?> then
change [color v] effect by (50)
end
end

Try it out yourself: the sprite will sometimes change color when it touches the edge, but not 100% of the time it touches the edge. This seems a little counterintuitive. Maybe it's a bug? Or it just further cements the idea that “if on edge, bounce” is its own entity.

Last edited by Za-Chary (July 16, 2026 14:05:00)

#6July 16, 2026 15:26:29
4022201
Scratcher
39 posts

Edge

you cant just do:
forever
wait until <touching [edge v] ?>
if on edge, bounce
...
as a workaround?

edit:
forever
repeat until <touching [edge v] ?>
move (5) steps
end
if on edge, bounce
...
end

Last edited by 4022201 (July 16, 2026 15:35:41)

#7July 16, 2026 15:49:43
Za-Chary
Scratcher
1000+ posts

Edge

4022201 wrote:

- snip -
This doesn't work because it often changes color twice while it bounces (that is, the color effect often changes by 100 rather than 50):

forever
repeat until <touching [edge v] ?>
move (5) steps
end
if on edge, bounce
change [color v] effect by (50)
end
#8Yesterday 11:27:47
scratchy_boy106
Scratcher
1000+ posts

Edge

when green flag clicked
forever
move (10) steps
if <touching [edge v] ?> then
if on edge, bounce
change [color v] effect by (25)
end
end

Last edited by scratchy_boy106 (Yesterday 11:28:05)

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