The first step to decorating a Christmas tree, whether fresh or artificial, should be putting on the Christmas lights. Often people do not add enough lights or add them incorrectly, which does not illuminate the Christmas tree like it should. Here are some designer secrets for adding Christmas lights to a Christmas tree, even if you are using a pre-lit tree this year.
Filling the screen area with a solid white color which value makes up the percentage is an expression controlled by a simple slider fx. The goal was to end up with simple, lite and nice donut chart. I didn't have chance to go deep in this concept, it just didn't survive :)