Changing the angle of a Pie-Shape

Good morning,

I would like to have so called "Harvey-Balls". I use the already available Pie-Shapes for that. No I want to change the "value" of these Harvey-Balls which is the angle of the slide missing. (I hope it's clear what I mean).

I can do this manually by moving the yellow rectangles but I would like to achive that with VBA too.

Any ideas?

Thanks