Ianjorgensen/suspend draw

@jebeck 
What's the magic `5` here? I also think you need to subtract from `rightEdge`, not add to `doseEnd`. There's a gap between the path and the red path segment:
![screenshot 2014-08-07 11 42 08](https://cloud.githubusercontent.com/assets/1588547/3847308/517032e4-1e64-11e4-8f2e-965c18039aff.png)