Pie Timer bar

Hi,

I need some help creating the image below in C2:

<img src="http://www.xgamedev.com/tutz/c2/circlehealth.png" border="0" />

It is for a game I'm making for a client, he wants a "Pie" timer display.

When the game starts the "pie" is full, as time runs out, the pie must become less full... I did someone similar before, using masks, and it worked well, for a half circle health bar, but that trick doesn?t work for a full circle, where the angle must change to mask the ?white? middle of the timer circle. Hope this makes sense LOL

How could I do something like this is C2? The ?cut-out/mask? must change with time, and the time could be anything from 40-120 sec.

Tks

I tried something similar last time, and what I did was I create a 'slice of pie' image and instance it a few times, with each instance rotating an incremental value until it's a complete circle. Then the timer will simply hide away each slice of the pie. It did pretty well but it was a resource hungry technique, and probably a dumb one as well.