Loop rotation with values and acceleration

[J3sseM]

Hey guys, the title says it all!
I'm trying to build a dynamic light that hangs from the roof, moving a little bit.
It is possible that there is a very easy way to do this, and I'm making this too complicated. If so feel free to suggest a better way!

But so far I have this kind of setting:
Always - Set angle to rotaatio("dynlight") (Quality= 1)
(rotaatio is a value for my dynlight object).

Then I created a small object (kiinnike) which overlaps with the dynlight.
"dynlight is overlapping kiinnike
"Rotaatio of dynlight >= -25 + add 0.1 to rotaatio
____________________________________

Okey so now my light turns from angle -25 to infinity.
It would be idealistic to make it loop from -25 to +25 or even less, and also add some kind of acceleration to make it look more realistic.
Any suggestions where to start experienting?

Oh, ps. Bought my copy of Multimedia Fusion 2 Dev yesterday! Love this software!

- Jesse

[J3sseM]

Hymm also tried:

Rotaatio of dynlight = -15 Set internal flag 1 on
Rotaatio of dynlight = 15 Set internal flag 1 off

Internal flag 1 is on add 0.1 to rotaatio
Internal flag 1 is off sub 0.1 from rotaatio

It starts moving just fine but won't turn back when angle is 15, but it keeps moving.
Can't figure what is wrong here, any ideas?

EDIT: There is something I'm thinking wrong now, cause I tried with upon pressing key, toggle internal flag 1 which works. Gotta take closer look.
EDIT2: I paired a counter with my value, and it seems to count over 15, even thou it should toggle the flag when it hits value 15. Could this be a bug?
EDIT3: Who knows, but setting both rules to "lower or equal" and "greater or equal" it toggles just fine!
So now I gotta think how to add acceleration, any tips for that?

[SolarB]

This is easiest to do with Sin.

Example:

lightrotate.mfa


Check the global values to modify the angle and speed.

[J3sseM]

Cool!
Thanks, I'll check that out!