How do I give a random path and limit the area sprites can move?

So whats the best practice for having something like a bug hover around an object at random angles but never leave the area. been playing with the pathfinder but how would you limit it to say 500 pixels?

imagine butterflies or dragonflies that don't leave the pond area...

Note this could be very cool with the new orbit behavior :)

You can do this with 2 Sine behaviors, one Horizontal, another Vertical. Set random period, offset and magnitude values.

Alternatively you can have two behavior states, default is random motion, second triggers when distance is greater than range, move back towards center of constraint area.

Thanks Dop2000 and Oosyag,

Those seem like great solutions. Going to have fun combining the sine, orbit and some transparent PNGs :)