does anyone know how to make a sprite bounce only up and down of off another sprite on scratch?

I believe this belongs in Help with Scripts. Requesting to be moved there…

what do you mean? Please elaborate.

dhakabangladesh wrote:

does anyone know how to make a sprite bounce only up and down of off another sprite on scratch?

assuming you want a sprite to collide with one and then bounce up(while being affected by gravity):

...
repeat until <> // leaving the repeat until blank makes it function like a forever loop, but you can stop it if u need to later in the project
change [y-momentum v] by (-1) // y-momentum is the speed on the y axis(up/down). lowering it by 1 each frame mimics gravity
change y by (y-momentum) // this moves the sprite at an increasing speed while falling, and a decreasing speed while moving up
if <touching [thing v]> then // if we hit the other sprite, we need to bounce
set [y-momentum v] to (5) // by setting the momentum to 5, it would move a total of 15 pixels up before beginning to fall again. feel free to adjust
end
end

if you meant using a block similair to the “if on edge, bounce” block, that isnt easily possible.

CatGuyAnimates wrote:

...
repeat until <> // leaving the repeat until blank makes it function like a forever loop, but you can stop it if u need to later in the project
change [y-momentum v] by (-1) // y-momentum is the speed on the y axis(up/down). lowering it by 1 each frame mimics gravity
change y by (y-momentum) // this moves the sprite at an increasing speed while falling, and a decreasing speed while moving up
if <touching [thing v]> then // if we hit the other sprite, we need to bounce
set [y-momentum v] to (5) // by setting the momentum to 5, it would move a total of 15 pixels up before beginning to fall again. feel free to adjust
end
end

That repeatedly moves the sprite down even if it isn't touching the sprite though…

forever
if <touching [sprite v] ?> then //initiates the jumping script when they collide
set [y vel v] to [10]
repeat (20)
change y by (y vel)
change [y vel v] by (-1)
end
end
end

MasterofTheBrick wrote:

CatGuyAnimates wrote:

...
repeat until <> // leaving the repeat until blank makes it function like a forever loop, but you can stop it if u need to later in the project
change [y-momentum v] by (-1) // y-momentum is the speed on the y axis(up/down). lowering it by 1 each frame mimics gravity
change y by (y-momentum) // this moves the sprite at an increasing speed while falling, and a decreasing speed while moving up
if <touching [thing v]> then // if we hit the other sprite, we need to bounce
set [y-momentum v] to (5) // by setting the momentum to 5, it would move a total of 15 pixels up before beginning to fall again. feel free to adjust
end
end

That repeatedly moves the sprite down even if it isn't touching the sprite though…

forever
if <touching [sprite v] ?> then //initiates the jumping script when they collide
set [y vel v] to [10]
repeat (20)
change y by (y vel)
change [y vel v] by (-1)
end
end
end

yes thats the point. also you might want to switch your “repeat 20” with a “repeat 21” otherwise it will move up 1 pixel each time it bounces.

CatGuyAnimates wrote:

yes thats the point.

That would make the object continually move downwards, even if it was somewhere else on the screen (aka not above the sprite that activates the bounce), or even if the object wasn't in the process of bouncing at all. You're assuming that once the object starts bouncing, it repeatedly does so throughout the duration of the project, without taking into account that the bouncing object might have movement scripts of its own.