make these explicit

That makes it easier to debug as even if you uncomment some lines the
rectangle will still be at the same position

Change-Id: I5576b2702962bb15663e0170cadb0d49ef33c0ab
get size correct for virtual devices

Change-Id: I8fff04f561d57083c65a87ad5bd0e04cb9b9ed2c
fix comment

Change-Id: I5d0f4a1ae8ac56e9da8d19b7b433513271e7a705
use different line and fill colors

makes it easier to see if one is missing

Change-Id: I983fdf2edf22c431d601a63dbf90902a3f8657f2
improvement for ellipse rendering

Change-Id: I0ce74b77e0b08ddde5b93cf9e9da2ee7e0a1fdea