How do I make a pulsing effect? I want just want it to do a simple growing smaller and bigger effect, and can you also tell me what to do to make the pulse faster or slower?

repeat (...)
change size by (...)
end
repeat (...)//same number
change size by (...)//negative of the first change size by.
end

If you want to change the rate mid-project, make the repeat count and/or size change a variable.

adding to what @Catscratcher07 said, you can also do

forever
set size to ((([sin v] of ((timer) * (10))) * (5)) + (100)) %
end

Thanks! However, I want to make it go smoothly, not just switching between sizes. I want it to shrink size and grow larger with an animation.

AnMSMmaniac wrote:

Thanks! However, I want to make it go smoothly, not just switching between sizes. I want it to shrink size and grow larger with an animation.

Thats quite literally what that does. In Scratch, nothing is truly continuos. What looks like a smooth animation is always just a bunch of very fast, discrete change in costume, size, or position.

I made this simple pulsing animation code, kinda looks like a beating heart.

when green flag clicked
forever
set size to (145) %
repeat (15)
change size by (-3)
end
end

Create a sprite that is hidden and put this code in:

when green flag clicked
point in direction (45)
forever
turn cw (15) degrees //The larger the number the greater the rate.
end

Add this into original sprite:

when green flag clicked
set [fisheye v] effect to (0)
forever
change [fisheye v] effect by (([sin v] of ([Direction v] of [Second sprite v]))*(35)) //The larger the number the greater the intensity of the effect.
end