Drawing a soft mask... drawing api?

Hello everyone, (almost) first post here :wink:
I’m creating a, quite original flash website (meh… not my idea in fact, I’m only the flasher!), in wich you’re in a car, sitting on the passenger side, and you’re looking outside to see the contents coming on the road.
It rains.
A lot.
So the windowseat is “fogged” (how can I say that…???) and while you’re loading the content you actually can draw on the glass with your… err… finger (mouse!), like how your friends usually do in your car when you really don’t want their fingerprints all over your car glass :slight_smile:

Ok, easy way to do that:
1 - attachmovie
you actually duplicate a circle, give it some randomness in blurring and size so it looks irregular and place it right under your mouse.

Good, it works… but when you move fast, it just leaves a blank spaces between clip and clip…

Hey… that’s not fair… :frowning:

2 - drawing api
Oh my god… I can’t make a mask with a simple line, so I should draw a shape while moving the mouse.
The point is… HOW??? :frowning:

I dunno if there’s a better way to do that, but that’s the only one in my mind now.
Actually the drawn clip should also be blurred a little bit (1 or 2 percent) wich is not a problem since you can easily blur the container.

But now the real point is: how do I draw like that with the beginfill?!?!?

Note: I uploaded the fla so you can have an idea on how it looks…