Average pressure in cylinder- function object?
 

Hey all,
I have a cylinder as a geometry. I would like to average the pressure across the crosssections of the cylinder and then make a graph with the coordinate on the x Axis and the pressure on the y axis. My mesh is too big to be postprocessed in paraview. Iam aware I could sample a few planes, then calculate the value in PV. Is there away to achieve this directly in OF however? Iam still new, I have the feeling a function object could accomplish the job, but which one??
Answers are highly appreciated.