What library for c# to use for a Roundness-meter software?
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I'm working on a metrology laboratory and i need to develop a software in c# for a roundness-meter equipment, I've already started and I've found a problem, I need the software to show real-time graphics from the measurement that is being made, for that I'll need to use a library like Mscharts or Zedgraph, that is really fast for refreshing the information and has support for round graphs like Polar or radar, especially polar charts.
The problem I've seen in most libraries is that they all lack support for round graphs and are relatively slow.
Does anyone has a sugestion of a lybrary I could use?


Thank you for your help.
PS:The Software should show graphics like these ones:
![enter image description here][1]

![enter image description here][2]
![The final software should be like this one][3]


  [1]: http://i.stack.imgur.com/3gskY.jpg
  [2]: http://i.stack.imgur.com/1lteP.gif
  [3]: http://i.stack.imgur.com/hrvyg.png