Fixed an issue that would cause circles that were drawn in odd-sized rec...

Fixed an issue that would cause circles that were drawn in odd-sized rects to have flat edges.

![samcircleprogressviewcirclediff](https://f.cloud.github.com/assets/963948/2417672/c0a2da0a-ab27-11e3-8f17-e8a4fb59d23f.png)