Label enhancements in CircularDrawer

[davidmam]

Here are the updated Drawer commits.

[peterjc]

Repeating email:
http://lists.open-bio.org/pipermail/biopython-dev/2013-March/010462.html

Hi David,

I've not used your code as is, but have started by pulling out
and generalising what I felt was the least contentious part:

0877125

This means that label_position = start, middle, end (and some
historic aliases defined in the linear drawer code) now work
on circular GenomeDiagrams. I have made the default None,
which gives the current behaviour (as 'start' on linear, the
more complicated to explain vertical bottom on circular).

Support for allowing the default label orientation to be radially
consistent all round the circle (rather than the current flipping
for the left/right halves which assumes the output is kept
vertical) would be nice, but the thing I am most keen on is the
inside/outside of the track label placement. Hopefully I'll have
time to finish that this weekend...

Peter

[peterjc]

With the changes included in Biopython 1.62 (and its beta), I think we can close this pull request now, OK?