iOS 4 create pie chart from 1 UIView and background image

I know that UIViews may transforms have applied to them , some of which change the shape of the underlying layer.

Here's wh开发者_高级运维at I want to do: Create one circular UIView, superimpose it on a different color background and cut a section from the UIView's middle over to it's edge, in an arc.

Is this possible with iOS?

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This dude made an awesome class for drawing pie charts:

http://code.google.com/p/chartreuse/downloads/detail?name=chartreuse-v1.0.zip&can=2&q=